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Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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1

Precipitation and Kinematic Structure of an Oceanic Mesoscale Convective System. Part I: Convective Line Structure  

Science Conference Proceedings (OSTI)

The precipitation, thermodynamic, and kinematic structure of an oceanic mesoscale convective system is studied using airborne Doppler and in situ (flight-level) data collected by the NOAA P-3 aircraft. The system, a well-organized, stationary, ...

David P. Jorgensen; Margaret A. LeMone; Ben Jong-Dao Jou

1991-11-01T23:59:59.000Z

2

Kinematic and Moisture Characteristics of a Nonprecipitating Cold Front Observed during IHOP. Part II: Alongfront Structures  

Science Conference Proceedings (OSTI)

Kinematic and thermodynamic structures of a nonprecipitating cold front observed in west-central Kansas on 10 June 2002 during the International H2O Project (IHOP) are examined with dropsondes and airborne instrumentation that includes Doppler ...

Katja Friedrich; David E. Kingsmill; Cyrille Flamant; Hanne V. Murphey; Roger M. Wakimoto

2008-10-01T23:59:59.000Z

3

Kinematic analysis and design of a six D.O.F. 3-PRPS in-parallel manipulator  

Science Conference Proceedings (OSTI)

This paper presents a kinematic analysis and design characteristics of an in-parallel manipulator developed for the probing task application that requires high precision, active compliance, and high control bandwidth. The developed manipulator is a class ... Keywords: In-parallel manipulator, Kinematic analysis, Kinematic design, PRPS joints, Real-time control

J. H. Shim; D. S. Kwon; H. S. Cho

1999-05-01T23:59:59.000Z

4

Kinematic, Dynamic, and Thermodynamic Analysis of a Weakly Sheared Severe Thunderstorm over Northern Alabama  

Science Conference Proceedings (OSTI)

A kinematic, dynamic, and thermodynamic analysis of a weakly sheared, airmass thunderstorm observed over northern Alabama is presented. Most notable is the fact that the dominant cell in this storm closely resembles the Byers and Braham model for ...

David E. Kingsmill; Roger M. Wakimoto

1991-02-01T23:59:59.000Z

5

A Tropical Squall Line Observed during the COPT 81 Experiment in West Africa. Part 1: Kinematic Structure Inferred from Dual-Doppler Radar Data  

Science Conference Proceedings (OSTI)

This paper deals with the analysis of a tropical squall line, observed on 22 June 1981 during the COPT 81 (Convection Profonde Tropicale) experiment. The present Part I is restricted to the study of the kinematic structure of the system, which ...

Michel Chong; Paul Amayenc; Georges Scialom; Jacques Testud

1987-03-01T23:59:59.000Z

6

Kinematic and Thermodynamic Structures of Sierra Barrier Jets and Overrunning Atmospheric Rivers during a Landfalling Winter Storm in Northern California  

Science Conference Proceedings (OSTI)

This study characterizes kinematic and thermodynamic structures of Sierra barrier jets (SBJs), atmospheric rivers (ARs), and their interaction over the period 14–16 February 2011 when a winter storm made landfall in northern California. A suite of ...

David E. Kingsmill; Paul J. Neiman; Benjamin J. Moore; Mimi Hughes; Sandra E. Yuter; F. Martin Ralph

2013-06-01T23:59:59.000Z

7

COMPLEX STRUCTURE IN CLASS 0 PROTOSTELLAR ENVELOPES. II. KINEMATIC STRUCTURE FROM SINGLE-DISH AND INTERFEROMETRIC MOLECULAR LINE MAPPING  

SciTech Connect

We present a study of dense molecular gas kinematics in 17 nearby protostellar systems using single-dish and interferometric molecular line observations. The non-axisymmetric envelopes around a sample of Class 0/I protostars were mapped in the N{sub 2}H{sup +} (J = 1 {yields} 0) tracer with the IRAM 30 m, CARMA, and Plateau de Bure Interferometer, as well as NH{sub 3} (1,1) with the Very Large Array. The molecular line emission is used to construct line-center velocity and linewidth maps for all sources to examine the kinematic structure in the envelopes on spatial scales from 0.1 pc to {approx}1000 AU. The direction of the large-scale velocity gradients from single-dish mapping is within 45{sup 0} of normal to the outflow axis in more than half the sample. Furthermore, the velocity gradients are often quite substantial, the average being {approx}2.3 km s{sup -1} pc{sup -1}. The interferometric data often reveal small-scale velocity structure, departing from the more gradual large-scale velocity gradients. In some cases, this likely indicates accelerating infall and/or rotational spin-up in the inner envelope; the median velocity gradient from the interferometric data is {approx}10.7 km s{sup -1} pc{sup -1}. In two systems, we detect high-velocity HCO{sup +} (J = 1 {yields} 0) emission inside the highest-velocity N{sub 2}H{sup +} emission. This enables us to study the infall and rotation close to the disk and estimate the central object masses. The velocity fields observed on large and small scales are more complex than would be expected from rotation alone, suggesting that complex envelope structure enables other dynamical processes (i.e., infall) to affect the velocity field.

Tobin, John J.; Hartmann, Lee; Bergin, Edwin A. [Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States); Chiang, Hsin-Fang; Looney, Leslie W. [Department of Astronomy, University of Illinois, Urbana, IL 61801 (United States); Chandler, Claire J. [National Radio Astronomy Observatory, Socorro, NM 87801 (United States); Masque, Josep M. [Departament d'Astronomia i Meteorologia, Universitat de Barcelona, 08028 Barcelona, Catalunya (Spain); Maret, Sebastien [UJF-Grenoble 1/CNRS-INSU, Institut de Planetologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble F-38041 (France); Heitsch, Fabian, E-mail: jjtobin@umich.edu [Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599 (United States)

2011-10-10T23:59:59.000Z

8

Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033  

E-Print Network (OSTI)

We present integral field spectroscopy of NGC 5033, a low luminosity Seyfert galaxy. The observations were made with INTEGRAL, a fiber based system operating at the WHT. The intensity map of the H$\\beta$ emission line represents a spiral or ring-like pattern of HII regions. On the contrary, the [OIII] intensity map morphology is markedly anisotropic. The strong morphological differences imply that the [OIII] emitters represent highly ionized gas illuminated by the central source. The [OIII] map morphology is compatible with a biconical structure of ionization induced by strong extinction in the galaxy disc that also obscures half of the spheroidal stellar bulge. We identify the spectrum corresponding to the Seyfert 1 nucleus from the presence of H$\\beta$ broad emission lines. This spectrum is located in a region where strong extinction is expected but exhibits the bluest spectral energy distribution. The Seyfert 1 nucleus seems to be offcenter with respect to the stellar rotation center. This result has been also found in other Seyfert galaxies and interpreted in terms of a past merger. The offcentering could indicate the presence of nonsymmetric departures in the gravitational potential which could be fueling the active nucleus. The kinematics of the [OIII] emitters show important deviations at a kpc scale with respect to the stellar velocity field and show features related to the asymmetrical morphology of the high ionization region.

E. Mediavilla; A. Guijarro; A. Castillo-Morales; J. Jimenez-Vicente; E. Florido; S. Arribas; B. Garcia-Lorenzo; E. Battaner

2004-12-16T23:59:59.000Z

9

Modular multimorphic kinematic arm structure and pitch and yaw joint for same  

DOE Patents (OSTI)

A multimorphic kinematic manipulator arm is provided with seven degrees of freedom and modular kinematic redundancy through identical pitch/yaw, shoulder, elbow and wrist joints and a wrist roll device at the wrist joint, which further provides to the manipulator arm an obstacle avoidance capability. The modular pitch/yaw joints are traction drive devices which provide backlash free operation with smooth torque transmission and enhanced rigidity. A dual input drive arrangement is provided for each joint resulting in a reduction of the load required to be assumed by each drive and providing selective pitch and yaw motions by control of the relative rotational directions of the input drive.

Martin, H. Lee (Knoxville, TN); Williams, Daniel M. (Oliver Springs, TN); Holt, W. Eugene (Knoxville, TN)

1989-01-01T23:59:59.000Z

10

The Impact of Horizontal Grid Spacing on the Microphysical and Kinematic Structures of Strong Tropical Cyclones Simulated with the WRF-ARW Model  

Science Conference Proceedings (OSTI)

Using the Advanced Weather Research and Forecasting numerical model, the impact of horizontal grid spacing on the microphysical and kinematic structure of a numerically simulated tropical cyclone (TC), and their relationship to storm intensity ...

Alexandre O. Fierro; Robert F. Rogers; Frank D. Marks; David S. Nolan

2009-11-01T23:59:59.000Z

11

The analysis of circuit breakers kinematics characteristics using the artificial neural networks  

Science Conference Proceedings (OSTI)

The paper presents the required parameters in the evaluation of the technical state for the High Voltage (HV) circuit breakers. It details some aspects regarding the influence of the kinematics characteristics to the circuit breakers performances. Also, ... Keywords: artificial neural network, circuit breaker, diagnostic, kinematics characteristics, modelling and simulation, monitoring

Maricel Adam; Adrian Baraboi; Catalin Pancu; Sorin Pispiris

2009-02-01T23:59:59.000Z

12

Understanding BL Lac objects Structural & kinematic mode changes in the BL Lac object PKS 0735+178  

E-Print Network (OSTI)

Context. We present evidence that parsec-scale jets in BL Lac objects may be significantly distinct in kinematics from their counterparts in quasars. We argued this previously for the BL lac sources 1803+784 and 0716+714, report here a similar pattern for another well-known BL Lac object, PKS 0735+178, whose nuclear jet is found to exhibit kinematics atypical of quasars. Aims. A detailed study of the jet components' motion reveals that the standard AGN paradigm of apparent superluminal motion does not always describe the kinematics in BL Lac objects. We study 0735+178 here to augment and improve the understanding of the peculiar motions in the jets of BL Lac objects as a class. Methods. We analyzed 15 GHz VLBA (Very Long Baseline Array) observations (2cm/MOJAVE survey) performed at 23 epochs between 1995.27 and 2008.91. Results. We found a drastic structural mode change in the VLBI jet of 0735+178, between 2000.4 and 2001.8 when its twice sharply bent trajectory turned into a linear shape.We further found tha...

Britzen, S; Gong, B P; Zhang, J W; Gopal-Krishna,; Goyal, Arti; Aller, M F; Aller, H D; Zensus, J A

2010-01-01T23:59:59.000Z

13

Modular multimorphic kinematic arm structure and pitch and yaw joint for same  

DOE Patents (OSTI)

A multimorphic kinematic manipulator arm is provided with seven degrees of freedom and modular kinematic redundancy through identical pitch/yaw, shoulder, elbow and wrist joints and a wrist roll device at the wrist joint, which further provides to the manipulator arm an obstacle avoidance capability. The modular pitch/yaw joints are traction drive devices which provide backlash free operation with smooth torque transmission and enhanced rigidity. A dual input drive arrangement is provided for each joint resulting in a reduction of the load required to be assumed by each drive means and providing selective pitch and yaw motions by control of the relative rotational directions of the input drive means. 12 figs.

Martin, H.L.; Williams, D.M.; Holt, W.E.

1987-04-21T23:59:59.000Z

14

Electrical and Kinematic Structure of the Stratiform Precipitation Region Trailing an Oklahoma Squall Line  

Science Conference Proceedings (OSTI)

An electric field sounding through the transition zone precipitation minimum that trailed an Oklahoma squall line on 18 June 1987 provides information about the electrical structure within a midlatitude trailing stratiform cloud. A single-Doppler ...

Terry J. Schuur; W. David Rust; Bradley F. Smull; Thomas C. Marshall

1991-03-01T23:59:59.000Z

15

Evolution of Quasi-Two-Dimensional Squall Lines. Part I: Kinematic and Reflectivity Structure  

Science Conference Proceedings (OSTI)

Doppler radar observations that establish common patterns in the evolution of the reflectivity and flow structures of squall lines are described. A number of squall lines have been analyzed with unprecedented time resolution in order to identity ...

Erik N. Rasmussen; Steven A. Rutledge

1993-08-01T23:59:59.000Z

16

Measuring Canopy Structure and the Kinematics of Subcanopy Flows in Two Forests  

Science Conference Proceedings (OSTI)

A better understanding of forest subcanopy flows is needed to evaluate their role in the horizontal movement of scalars, particularly in complex terrain. This paper describes detailed measurements of the canopy structure and its variability in ...

Ralf M. Staebler; David R. Fitzjarrald

2005-08-01T23:59:59.000Z

17

A Multiscale Numerical Study of Hurricane Andrew (1992). Part II: Kinematics and Inner-Core Structures  

Science Conference Proceedings (OSTI)

Despite considerable research, understanding of the temporal evolution of the inner-core structures of hurricanes is very limited owing to the lack of continuous high-resolution observational data of a storm. In this study, the results of a 72-h ...

Yubao Liu; Da-Lin Zhang; M. K. Yau

1999-11-01T23:59:59.000Z

18

Kinematic and Mechanical Reconstruction of Walker Ridge Structures, Deepwater Gulf of Mexico  

E-Print Network (OSTI)

Recent high-resolution seismic imaging has allowed detailed reconstruction of the relationship between fold development and crestal faulting of the Chinook and Cascade folds in the deepwater Gulf of Mexico. Using 3-D seismic and biostratigraphic data, we have found that (1) short wavelength (~2300m), small amplitude folds (~540m) within the upper Cretaceous and upper Jurassic stratigraphic sequences took place no later than the late Jurassic, (2) large wavelength and amplitude fold growth, starting in the early Cretaceous, was produced by salt withdrawal, and (3) periods of increased sedimentation, fold growth, and fault slip occurred during the middle Miocene and late Miocene. Although the dominant stage of long wavelength, large amplitude fold growth started around early Cretaceous, the development of the Cascade and Chinook structures was continuous, punctuated by episodes of accelerated growth during the middle Miocene at rates of 337 and 235 m/Ma in the Cascade and 203 and 230 m/Ma in the Chinook. A later event of accelerated growth occurred during the late Miocene at rates of 1038 m/Ma in the Cascade and 1189 m/Ma in the Chinook. Accompanying fold growth was sedimentation, which was highest at 1949 m/Ma in the Cascade and 2585 m/Ma in the Chinook. Although limb tilt rates varied through fold growth, the highest rates also occurred during the middle Miocene at 0.330 and 0.196 degree/Ma for the Cascade and Chinook, respectively with the development of crestal faults at maximum slip rates of 88 and 90 m/Ma.

Majekodunmi, Oluwatosin Eniola

2009-12-01T23:59:59.000Z

19

Kinematic and Moisture Characteristics of a Nonprecipitating Cold Front Observed during IHOP. Part I: Across-Front Structures  

Science Conference Proceedings (OSTI)

A wide array of ground-based and airborne instrumentation is used to examine the kinematic and moisture characteristics of a nonprecipitating cold front observed in west-central Kansas on 10 June 2002 during the International H2O Project (IHOP). ...

Katja Friedrich; David E. Kingsmill; Cyrille Flamant; Hanne V. Murphey; Roger M. Wakimoto

2008-01-01T23:59:59.000Z

20

Analysis of hydraulic power transduction in regenerative rotary shock absorbers as function of working fluid kinematic viscosity  

E-Print Network (OSTI)

This investigation seeks to investigate the relationship of kinematic fluid viscosity to the effective power transduction seen by a hydraulic motor. Applications of this research specifically relate to energy recovery from ...

Avadhany, Shakeel N

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

GAS DISTRIBUTION, KINEMATICS, AND EXCITATION STRUCTURE IN THE DISKS AROUND THE CLASSICAL Be STARS {beta} CANIS MINORIS AND {zeta} TAURI  

SciTech Connect

Using CHARA and VLTI near-infrared spectro-interferometry with hectometric baseline lengths (up to 330 m) and with high spectral resolution (up to {lambda}/{Delta}{lambda} = 12, 000), we studied the gas distribution and kinematics around two classical Be stars. The combination of high spatial and spectral resolution achieved allows us to constrain the gas velocity field on scales of a few stellar radii and to obtain, for the first time in optical interferometry, a dynamical mass estimate using the position-velocity analysis technique known from radio astronomy. For our first target star, {beta} Canis Minoris, we model the H+K-band continuum and Br{gamma}-line geometry with a near-critical rotating stellar photosphere and a geometrically thin equatorial disk. Testing different disk rotation laws, we find that the disk is in Keplerian rotation (v(r){proportional_to}r{sup -0.5{+-}0.1}) and derive the disk position angle (140 Degree-Sign {+-} 1.{sup 0}7), inclination (38.{sup 0}5 {+-} 1 Degree-Sign ), and the mass of the central star (3.5 {+-} 0.2 M{sub Sun }). As a second target star, we observed the prototypical Be star {zeta} Tauri and spatially resolved the Br{gamma} emission as well as nine transitions from the hydrogen Pfund series (Pf 14-22). Comparing the spatial origin of the different line transitions, we find that the Brackett (Br{gamma}), Pfund (Pf 14-17), and Balmer (H{alpha}) lines originate from different stellocentric radii (R{sub cont} < R{sub Pf} < R{sub Br{gamma}} {approx} R{sub H{alpha}}), which we can reproduce with an LTE line radiative transfer computation. Discussing different disk-formation scenarios, we conclude that our constraints are inconsistent with wind compression models predicting a strong outflowing velocity component, but support viscous decretion disk models, where the Keplerian-rotating disk is replenished with material from the near-critical rotating star.

Kraus, S.; Monnier, J. D.; Che, X.; Baron, F. [Department of Astronomy, University of Michigan, 918 Dennison Building, Ann Arbor, MI 48109-1090 (United States); Schaefer, G.; Ten Brummelaar, T. A.; McAlister, H. A.; Turner, N. H.; Sturmann, J.; Sturmann, L. [CHARA Array, Georgia State University, P.O. Box 3965, Atlanta, GA 30302-3965 (United States); Touhami, Y.; Gies, D. R. [Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P.O. Box 4106, Atlanta, GA 30302-4106 (United States); Aufdenberg, J. P. [Department of Physical Sciences, Embry-Riddle Aeronautical University, 600 S. Clyde Morris Blvd., Daytona Beach FL 32114 (United States); Thureau, N., E-mail: stefankr@umich.edu [Department of Physics and Astronomy, University of St. Andrews (United Kingdom)

2012-01-01T23:59:59.000Z

22

Contingency structures and concept analysis  

Science Conference Proceedings (OSTI)

Formal Concept Analysis has found many uses in knowledge representation and data mining, but its penetration into established data-based research disciplines has been slower. Marrying application motivations, structures, and methods from epidemiology ...

Alex Pogel; David Ozonoff

2008-02-01T23:59:59.000Z

23

Worst-case structural analysis  

Science Conference Proceedings (OSTI)

Direct digital manufacturing is a set of rapidly evolving technologies that provide easy ways to manufacture highly customized and unique products. The development pipeline for such products is radically different from the conventional manufacturing ... Keywords: digital manufacturing, structural analysis

Qingnan Zhou, Julian Panetta, Denis Zorin

2013-07-01T23:59:59.000Z

24

Kinematics of compressional and extensional ductile shearing...  

Open Energy Info (EERE)

the northeastern basin and range Details Activities (1) Areas (1) Regions (0) Abstract: Analysis of shear criteria enables the kinematics of two main ductile-shearing events (D1...

25

Two-dimensional kinematics of SLACS lenses: I. Phase-space analysis of the early-type galaxy SDSS J2321-097 at z=0.1  

E-Print Network (OSTI)

We present the first results of a combined VLT VIMOS integral-field unit and Hubble Space Telescope (HST)/ACS study of the early-type lens galaxy SDSS J2321-097 at z=0.0819, extending kinematic studies to a look-back time of 1 Gyr. This system, discovered in the Sloan Lens ACS Survey (SLACS), has been observed as part of a VLT Large Programme with the goal of obtaining two-dimensional stellar kinematics of 17 early-type galaxies to z~0.35 and Keck spectroscopy of an additional dozen lens systems. Bayesian modelling of both the surface brightness distribution of the lensed source and the two-dimensional measurements of velocity and velocity dispersion has allowed us, under the only assumptions of axisymmetry and a two-integral stellar distribution function (DF) for the lens galaxy, to dissect this galaxy in three dimensions and break the classical mass--anisotropy, mass-sheet and inclination--oblateness degeneracies. Our main results are that the galaxy (i) has a total density profile well described by a single power-law rho propto r^{-gamma'} with gamma'=2.06^{+0.03}_{-0.06}; (ii) is a very slow rotator (specific stellar angular momentum parameter lambda_R = 0.075); (iii) shows only mild anisotropy (delta ~ 0.15); and (iv) has a dark matter contribution of ~30 per cent inside the effective radius. Our first results from this large combined imaging and spectroscopic effort with the VLT, Keck and HST show that the structure of massive early-type galaxies beyond the local Universe can now be studied in great detail using the combination of stellar kinematics and gravitational lensing. Extending these studies to look-back times where evolutionary effects become measurable holds great promise for the understanding of formation and evolution of early-type galaxies.

Oliver Czoske; Matteo Barnabe; Leon V. E. Koopmans; Tommaso Treu; Adam S. Bolton

2007-11-06T23:59:59.000Z

26

Unraveling L_{n,k}: Grassmannian Kinematics  

Science Conference Proceedings (OSTI)

It was recently proposed that the leading singularities of the S-Matrix of N = 4 super Yang-Mills theory arise as the residues of a contour integral over a Grassmannian manifold, with space-time locality encoded through residue theorems generalizing Cauchy's theorem to more than one variable. We provide a method to identify the residue corresponding to any leading singularity, and we carry this out explicitly for all leading singularities at tree level and one-loop. We also give several examples at higher loops, including all generic two-loop leading singularities and an interesting four-loop object. As an example we consider a 12-pt N{sup 4}MHV leading singularity at two loops that has a kinematic structure involving double square roots. Our analysis results in a simple picture for how the topological structure of loop graphs is reflected in various substructures within the Grassmannian.

Kaplan, Jared; /SLAC

2010-02-15T23:59:59.000Z

27

Kinematical evidence for top pairs at the Tevatron  

SciTech Connect

We present a top search analysis of W+jet events which combines a study of the kinematic features of the events with a search for bottom quarks.

Grassmann, H. [Fermi National Accelerator Lab., Batavia, IL (United States)]|[Duke Univ., Durham, NC (United States); CDF Collaboration

1994-09-01T23:59:59.000Z

28

A wearable system that learns a kinematic model and finds structure in everyday manipulation by using absolute orientation sensors and a camera  

E-Print Network (OSTI)

This thesis presents Duo, the first wearable system to autonomously learn a kinematic model of the wearer via body-mounted absolute orientation sensors and a head-mounted camera. With Duo, we demonstrate the significant ...

Kemp, Charles C. (Charles Clark), 1972-

2005-01-01T23:59:59.000Z

29

Combined Analysis: structure-texture-microstructure-phase-  

E-Print Network (OSTI)

Combined Analysis: structure-texture-microstructure-phase- stresses-reflectivity determination by x #12;Combined Analysis: structure-texture-microstructure-phase-stresses- reflectivity determination ................................................................................................. 83 2.10.1 The phase problem in diffraction

Paris-Sud XI, Université de

30

Upper bound limit analysis model for FRP-reinforced masonry curved structures. Part II: Structural analyses  

Science Conference Proceedings (OSTI)

A homogenized full 3D limit analysis model for the evaluation of collapse loads of FRP-reinforced masonry vaults is presented. Six-noded rigid infinitely resistant wedges are used to model masonry. Three-noded rigid infinitely resistant triangles are ... Keywords: FRP-reinforcement, Homogenization, Kinematic approach, Limit analysis, Masonry, Vaults

Gabriele Milani; Enrico Milani; Antonio Tralli

2009-12-01T23:59:59.000Z

31

Computer applications for engineering/structural analysis  

SciTech Connect

Analysts and organizations have a tendency to lock themselves into specific codes with the obvious consequences of not addressing the real problem and thus reaching the wrong conclusion. This paper discusses the role of the analyst in selecting computer codes. The participation and support of a computation division in modifying the source program, configuration management, and pre- and post-processing of codes are among the subjects discussed. Specific examples illustrating the computer code selection process are described in the following problem areas: soil structure interaction, structural analysis of nuclear reactors, analysis of waste tanks where fluid structure interaction is important, analysis of equipment, structure-structure interaction, analysis of the operation of the superconductor supercollider which includes friction and transient temperature, and 3D analysis of the 10-meter telescope being built in Hawaii. Validation and verification of computer codes and their impact on the selection process are also discussed.

Zaslawsky, M.; Samaddar, S.K.

1991-01-01T23:59:59.000Z

32

Case Studies in Failure Analysis: From Civilian Structures to Dies ...  

Science Conference Proceedings (OSTI)

Analysis of a Bucketwheel Stacker Reclaimer Structural Failure · Analysis of Glass Breakage · Analysis of Sealed, Integrated, Automotive Wheel Bearings.

33

Protein structure alignment using elastic shape analysis  

Science Conference Proceedings (OSTI)

In this paper we present a method for flexible protein structure alignment based on elastic shape analysis of backbones, in a manner that can incorporate different characteristics of the backbones. In particular, it can include the backbone geometry, ...

Wei Liu; Anuj Srivastava; Jinfeng Zhang

2010-08-01T23:59:59.000Z

34

IAPSAP, International Association for Protein Structure Analysis  

NLE Websites -- All DOE Office Websites (Extended Search)

19th Methods in Protein Structure Analysis Meeting June 25-28, 2012 Ottawa, Ontario, Canada Held in conjunction with the China Canada Systems Biology Symposium The goal of this...

35

ITER Central Solenoid support structure analysis  

Science Conference Proceedings (OSTI)

The ITER Central Solenoid (CS) is comprised of six independent coils held together by a pre-compression support structure. This structure must provide enough preload to maintain sufficient coil-to-coil contact and interface load throughout the current pulse. End of burn (EOB) represents one of the most extreme time-points doing the reference scenario when the currents in the CS3 coils oppose those of CS1 & CS2. The CS structure is performance limited by the room temperature static yield requirements needed to support the roughly 180 MN preload to resist coil separation during operation. This preload is applied by inner and external tie plates along the length of the coil stack by mechanical fastening methods utilizing Superbolt technology. The preloading structure satisfies the magnet structural design criteria of ITER and will be verified during mockup studies. The solenoid is supported from the bottom of the toroidal field (TF) coil casing in both the vertical radial directions. The upper support of the CS coil structure maintains radial registration with the TF coil in the event of vertical disruptions (VDE) loads and earthquakes. All of these structure systems are analyzed via a global finite element analysis (FEA). The model includes a complete sector of the TF coil and the CS coil/structure in one self-consistent analysis. The corresponding results and design descriptions are described in this report.

Freudenberg, Kevin D [ORNL; Myatt, R. [Myatt Consulting, Norfolk, MA

2011-01-01T23:59:59.000Z

36

Wind Project Financing Structures: A Review & Comparative Analysis  

NLE Websites -- All DOE Office Websites (Extended Search)

Wind Project Financing Structures: A Review & Comparative Analysis Title Wind Project Financing Structures: A Review & Comparative Analysis Publication Type Report Year of...

37

Structure-Soil-Structure Interaction Effects: Seismic Analysis of Safety-Related Collocated Structures  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

STRUCTURE-SOIL- STRUCTURE-SOIL- STRUCTURE INTERACTION AT SRS Structural Mechanics - SRS October 25, 2011 1 Objective Determination of Structure Soil Structure Interaction (SSSI) effects, if any between large and more massive Process Building (PB) and Exhaust Fan Building (EFB). Results of the SSSI analysis were compared with those from Soil Structure Interaction (SSI) analysis of the individual buildings, for the following parameters: * In-structure floor response spectra (ISRS) * Transfer functions * Relative displacements for EFB and PB * In-plane- shear from SASSI at EFB wall 2 Building Description 3 The Process Building is a massive reinforced concrete structure supported approximately 40 feet below the finished grade. The PB approximate foundation dimensions are approximately

38

Usability analysis and design structure matrix  

Science Conference Proceedings (OSTI)

Computer-based user interfaces are incorporated in important parts of many electronics products. Recently, new systematic approaches have been presented for analysing the usability of user interfaces. These approaches include simulation and time ... Keywords: Apple iPod, DSM, Sendo mobile phones, cell phones, design structure matrix, music players, usability analysis, user interfaces, web sales configuration

Petri Helo; Tauno Kekale; Satu Lautamaki

2009-01-01T23:59:59.000Z

39

Live-structure dataflow analysis for Prolog  

Science Conference Proceedings (OSTI)

For the class of applicative programming languages, efficient methods for reclaiming the memory occupied by released data structures constitute an important aspect of current implementations. The present article addresses the problem of memory reuse ... Keywords: Prolog, abstract interpretation, compile-time garbage collection, liveness, program analysis

Anne Mulkers; William Winsborough; Maurice Bruynooghe

1994-03-01T23:59:59.000Z

40

Structural reliability analysis and seismic risk assessment  

SciTech Connect

This paper presents a reliability analysis method for safety evaluation of nuclear structures. By utilizing this method, it is possible to estimate the limit state probability in the lifetime of structures and to generate analytically the fragility curves for PRA studies. The earthquake ground acceleration, in this approach, is represented by a segment of stationary Gaussian process with a zero mean and a Kanai-Tajimi Spectrum. All possible seismic hazard at a site represented by a hazard curve is also taken into consideration. Furthermore, the limit state of a structure is analytically defined and the corresponding limit state surface is then established. Finally, the fragility curve is generated and the limit state probability is evaluated. In this paper, using a realistic reinforced concrete containment as an example, results of the reliability analysis of the containment subjected to dead load, live load and ground earthquake acceleration are presented and a fragility curve for PRA studies is also constructed.

Hwang, H.; Reich, M.; Shinozuka, M.

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Kinematics of compressional and extensional ductile shearing deformation in  

Open Energy Info (EERE)

Kinematics of compressional and extensional ductile shearing deformation in Kinematics of compressional and extensional ductile shearing deformation in a metamorphic core complex of the northeastern basin and range Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Kinematics of compressional and extensional ductile shearing deformation in a metamorphic core complex of the northeastern basin and range Details Activities (1) Areas (1) Regions (0) Abstract: Analysis of shear criteria enables the kinematics of two main ductile-shearing events (D1 and D2) to be established in the Raft River, Grouse Creek and Albion 'metamorphic core complex'. The first event (D1) is a NNE-thrusting and corresponds to Mesozoic shortening. A well developed non-coaxial ductile deformation (D2), of Cenozoic age, is marked by the occurrence of opposing eastward (in Raft River) and westward shear

42

A Cold Frontal Rainband Observed during the LANDES-FRONTS 84 Experiment: Mesoscale and Small-Scale Structure Inferred from Dual-Doppler Radar Analysis.  

Science Conference Proceedings (OSTI)

This paper presents the kinematic structure of a cold frontal rainband associated with a secondary cold front which moved over southwest of France on 4 June 1984.

Y. Lemaitre; G. Scialom; P. Amayenc

1989-07-01T23:59:59.000Z

43

An Integrated Display and Analysis Methodology for Multivariable Radar Data  

Science Conference Proceedings (OSTI)

Polarimetric Doppler radars provide valuable information about the kinematic and microphysical structure of storms. However, in-depth analysis using radar products, such as Doppler-derived wind vectors and hydrometeor identification, has been ...

Brenda A. Dolan; Steven A. Rutledge

2007-08-01T23:59:59.000Z

44

Structural Analysis of Sandwich Foam Panels  

SciTech Connect

The Sandwich Panel Technologies including Structural Insulated Panels (SIPs) can be used to replace the conventional wooden-frame construction method. The main purpose of this Cooperative Research and Development Agreement (CRADA) between UT-Battelle, LLC and SGI Venture, Inc. was to design a novel high R-value type of metal sandwich panelized technology. This CRADA project report presents design concept discussion and numerical analysis results from thermal performance study of this new building envelope system. The main objective of this work was to develop a basic concept of a new generation of wall panel technologies which will have R-value over R-20 will use thermal mass to improve energy performance in cooling dominated climates and will be 100% termite resistant. The main advantages of using sandwich panels are as follows: (1) better energy saving structural panels with high and uniform overall wall R-value across the elevation that could not be achieved in traditional walls; and (2) reducing the use of raw materials or need for virgin lumber. For better utilization of these Sandwich panels, engineers need to have a thorough understanding of the actual performance of the panels and system. Detailed analysis and study on the capacities and deformation of individual panels and its assembly have to be performed to achieve that goal. The major project activity was to conduct structural analysis of the stresses, strains, load capacities, and deformations of individual sandwich components under various load cases. The analysis simulated the actual loading conditions of the regular residential building and used actual material properties of the steel facings and foam.

Kosny, Jan [ORNL; Huo, X. Sharon [Tennessee Technological University

2010-04-01T23:59:59.000Z

45

Finite Element Analysis of Erosion for Offshore Structure  

Science Conference Proceedings (OSTI)

Presentation Title, Finite Element Analysis of Erosion for Offshore Structure ... impacting, is one of the major failure modes that cause offshore structure damage .

46

Manufacturing analysis of axisymmetric composite structures  

Science Conference Proceedings (OSTI)

Specific topics relating to the design, analysis, and manufacturing of three axisymmetric composite structures are investigated. The first study examines a graphite/epoxy pressure vessel designed to withstand 20 atmospheres pressure of xenon gas for use in an X-ray detection device. Design constraints dictate an oblate spherical pressure vessel manufactured using hand layup techniques. Experimental results compare favorably to predictions using finite-element analysis coupled with laminated-plate theory. The second topic deals with the design and manufacture of a stretched-membrane heliostat for solar-energy central-receiver systems. Based on theoretical predictions using laminated plate theory, a quasi-isotropic layup of (0/90{plus minus}45)s of E-glass/epoxy is recommended. Based on results of a characterization study, two one-meter diameter prototypes were designed, built, and tested. Finally, a centrifugal-casting technique for making seamless composite rings with continuous-fiber reinforcement is presented. A mathematical model of void transport in such centrifugally cast structures predicts that this approach could have significant advantages over existing composite-processing methods.

Alei, P.E.

1990-01-01T23:59:59.000Z

47

Application of constrained-layer damping to a precision kinematic coupling  

SciTech Connect

This paper addresses the need to support a very precise optical instrument while causing essentially no influence to its natural shape. Such influences could come from a number of sources, such as manufacturing tolerances, temperature changes, over-constrained structural members, or ground motion. Kinematic couplings have long been used for purposes of repeatable location and minimal influence to the supported object, however these couplings typically offer very little damping. This paper presents a kinematic coupling that utilizes constrained-layer damping techniques to damp out the first three modes of vibration of a precision optical instrument. Finite element analysis was used to aid in the design and tuning of the dampers for the kinematic coupling. Experimental tests were conducted and confirmed the effectiveness of the dampers. The quality factor (Q), which measure the amplification at resonance, dropped from 33.3 to 5.9 on the first mode, from 156.3 to 7.1 on the second mode, and from 147.1 to 18.5 on the third mode. These dampers help to ensure that the stringent vibration requirements necessary to produce high quality optical images are met.

Jensen, S A; Hale, L C

2000-10-10T23:59:59.000Z

48

JFKengine: A Jacobian and Forward Kinematics Generator  

SciTech Connect

During robot path planning and control the equations that describe the robot motions are determined and solved. Historically these expressions were derived analytically off-line. For robots that must adapt to their environment or perform a wide range of tasks, a way is needed to rapidly re-derive these expressions to take into account the robot kinematic changes, such as when a tool is added to the end-effector. The JFKengine software was developed to automatically produce the expressions representing the manipulator arm motion, including the manipulator arm Jacobian and the forward kinematic expressions. Its programming interface can be used in conjunction with robot simulation software or with robot control software. Thus, it helps to automate the process of configuration changes for serial robot manipulators. If the manipulator undergoes a geometric change, such as tool acquisition, then JFKengine can be invoked again from the control or simulation software, passing it parameters for the new arm configuration. This report describes the automated processes that are implemented by JFKengine to derive the kinematic equations and the programming interface by which it is invoked. Then it discusses the tree data structure that was chosen to store the expressions, followed by several examples of portions of expressions as represented in the tree. The C++ classes and their methods that implement the expression differentiation and evaluation operations are described. The algorithms used to construct the Jacobian and forward kinematic equations using these basic building blocks are then illustrated. The activity described in this report is part of a larger project entitled ''Multi-Optimization Criteria-Based Robot Behavioral Adaptability and Motion Planning'' that focuses on the development of a methodology for the generalized resolution of robot motion equations with time-varying configurations, constraints, and task objective criteria. A specific goal of this project is the implementation of this generalized methodology in a single general code that would be applicable to the motion planning of a wide class of systems and would automate many of the processes involved in developing and solving the motion planning and controls equations. This project is funded by the U.S. Department of Energy's Environmental Management Science Program (DOE-EMSP) as project EMSP no. 82794 and is transitioning to the DOE-Office of Biological and Environmental Research (OBER) as per FY-02.

Fischer, K.N.

2003-02-13T23:59:59.000Z

49

Kinematic Fitting of Detached Vertices  

SciTech Connect

The eg3 experiment at the Jefferson Lab CLAS detector aims to determine the existence of the $\\Xi_{5}$ pentaquarks and investigate the excited $\\Xi$ states. Specifically, the exotic $\\Xi_{5}^{--}$ pentaquark will be sought by first reconstructing the $\\Xi^{-}$ particle through its weak decays, $\\Xi^{-}\\to\\pi^{-}\\Lambda$ and $\\Lambda\\to\\pi^{-}$. A kinematic fitting routine was developed to reconstruct the detached vertices of these decays, where confidence level cuts on the fits are used to remove background events. Prior to fitting these decays, the exclusive reaction $\\gamma D\\rightarrow pp\\pi^{-}$ was studied in order to correct the track measurements and covariance matrices of the charged particles. The $\\Lambda\\rightarrow p\\pi^{-}$ and $\\Xi^{-}\\to\\pi^{-}\\Lambda$ decays were then investigated to demonstrate that the kinematic fitting routine reconstructs the decaying particles and their detached vertices correctly.

Paul Mattione

2007-05-01T23:59:59.000Z

50

An Ensemble Study of Wet Season Convection in Southwest Amazonia: Kinematics and Implications for Diabatic Heating  

Science Conference Proceedings (OSTI)

Dual-Doppler radar data from the Tropical Rainfall Measuring Mission Large Scale Biosphere–Atmosphere Experiment in Amazonia (TRMM-LBA) field campaign are used to determine characteristic kinematic and reflectivity vertical structures associated ...

Robert Cifelli; Lawrence Carey; Walter A. Petersen; Steven A. Rutledge

2004-12-01T23:59:59.000Z

51

Design and Development of 3-DOF Modular Micro Parallel Kinematic Manipulator  

E-Print Network (OSTI)

This paper presents the research and development of a 3-legged micro Parallel Kinematic Manipulator (PKM) for positioning in micro-machining and assembly operations. The structural characteristics associated with parallel ...

Ng, C. C.

52

Structure-Soil-Structure Interaction Effects: Seismic Analysis...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

(SSSI) effects, if any between large and more massive Process Building (PB) and Exhaust Fan Building (EFB). Results of the SSSI analysis were compared with those from Soil...

53

Structural Analysis of the Desert Peak-Brady Geothermal Fields,  

Open Energy Info (EERE)

Structural Analysis of the Desert Peak-Brady Geothermal Fields, Structural Analysis of the Desert Peak-Brady Geothermal Fields, Northwestern Nevada: Implications for Understanding Linkages Between Northeast-Trending Structures and Geothermal Reservoirs in the Humboldt Structural Zone Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Structural Analysis of the Desert Peak-Brady Geothermal Fields, Northwestern Nevada: Implications for Understanding Linkages Between Northeast-Trending Structures and Geothermal Reservoirs in the Humboldt Structural Zone Abstract Detailed geologic mapping, delineation of Tertiary strata, analysis of faults and folds, and a new gravity survey have elucidated the structural controls on the Desert Peak and Brady geothermal fields in the Hot Springs Mountains of northwestern Nevada. The fields lie within the Humboldt

54

Geothermal Resource Analysis and Structure of Basin and Range...  

Open Energy Info (EERE)

Energy, 2003 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for Geothermal Resource Analysis and Structure of Basin and Range Systems,...

55

Structural Analysis of the Desert Peak-Brady Geothermal Fields...  

Open Energy Info (EERE)

mapping, delineation of Tertiary strata, analysis of faults and folds, and a new gravity survey have elucidated the structural controls on the Desert Peak and Brady...

56

QCD analysis of structure functions in terms of Jacobi polynomials  

Science Conference Proceedings (OSTI)

z Tbilisi State University, SU-380 086 Tbilisi, USSR. Received 21 August 1986. Abstract. A new method of QCD-analysis of singlet and nonsinglet structure ...

57

Kinematics in Vector Boson Fusion  

E-Print Network (OSTI)

The vector boson fusion process leads to two forward/backward jets (tag jets) and the produced state, a Higgs boson in this case, moving slowly in the p-p C.M. frame at the LHC. For the case of Higgs decaying to W+W (W*) with Higgs mass below 180 GeV, the W bosons have low momentum in the Higgs C.M. For the case of W leptonic decays, this fact allows for an approximate reconstruction of the two final state neutrinos. In turn, those solutions then provide additional kinematic cuts against background.

D. Green

2006-03-02T23:59:59.000Z

58

ESF GROUND SUPPORT - STRUCTURAL STEEL ANALYSIS  

Science Conference Proceedings (OSTI)

The purpose and objective of this analysis are to expand the level of detail and confirm member sizes for steel sets included in the Ground Support Design Analysis, Reference 5.20. This analysis also provides bounding values and details and defines critical design attributes for alternative configurations of the steel set. One possible configuration for the steel set is presented. This analysis covers the steel set design for the Exploratory Studies Facility (ESF) entire Main Loop 25-foot diameter tunnel.

T. Misiak

1996-06-26T23:59:59.000Z

59

THE GREEN BANK TELESCOPE H II REGION DISCOVERY SURVEY. III. KINEMATIC DISTANCES  

SciTech Connect

Using the H I emission/absorption method, we resolve the kinematic distance ambiguity and derive distances for 149 of 182 (82%) H II regions discovered by the Green Bank Telescope H II Region Discovery Survey (GBT HRDS). The HRDS is an X-band (9 GHz, 3 cm) GBT survey of 448 previously unknown H II regions in radio recombination line and radio continuum emission. Here, we focus on HRDS sources from 67 Degree-Sign {>=} l {>=} 18 Degree-Sign , where kinematic distances are more reliable. The 25 HRDS sources in this zone that have negative recombination line velocities are unambiguously beyond the orbit of the Sun, up to 20 kpc distant. They are the most distant H II regions yet discovered. We find that 61% of HRDS sources are located at the far distance, 31% at the tangent-point distance, and only 7% at the near distance. 'Bubble' H II regions are not preferentially located at the near distance (as was assumed previously) but average 10 kpc from the Sun. The HRDS nebulae, when combined with a large sample of H II regions with previously known distances, show evidence of spiral structure in two circular arc segments of mean Galactocentric radii of 4.25 and 6.0 kpc. We perform a thorough uncertainty analysis to analyze the effect of using different rotation curves, streaming motions, and a change to the solar circular rotation speed. The median distance uncertainty for our sample of H II regions is only 0.5 kpc, or 5%. This is significantly less than the median difference between the near and far kinematic distances, 6 kpc. The basic Galactic structure results are unchanged after considering these sources of uncertainty.

Anderson, L. D. [Department of Physics, West Virginia University, Morgantown, WV 26506 (United States); Bania, T. M. [Institute for Astrophysical Research, Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States); Balser, Dana S. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475 (United States); Rood, Robert T., E-mail: Loren.Anderson@mail.wvu.edu [Astronomy Department, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903-0818 (United States)

2012-07-20T23:59:59.000Z

60

Geothermal Resource Analysis and Structure of Basin and Range Systems,  

Open Energy Info (EERE)

Analysis and Structure of Basin and Range Systems, Analysis and Structure of Basin and Range Systems, Especially Dixie Valley Geothermal Field, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Report: Geothermal Resource Analysis and Structure of Basin and Range Systems, Especially Dixie Valley Geothermal Field, Nevada Authors David D. Blackwell, Kenneth W. Wisian, Maria C. Richards, Mark Leidig, Richard Smith and Jason McKenna Published U.S. Department of Energy, 2003 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Geothermal Resource Analysis and Structure of Basin and Range Systems, Especially Dixie Valley Geothermal Field, Nevada Citation David D. Blackwell,Kenneth W. Wisian,Maria C. Richards,Mark Leidig,Richard Smith,Jason McKenna. 2003. Geothermal Resource Analysis and Structure of

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61

Computer applications for engineering/structural analysis. Revision 1  

SciTech Connect

Analysts and organizations have a tendency to lock themselves into specific codes with the obvious consequences of not addressing the real problem and thus reaching the wrong conclusion. This paper discusses the role of the analyst in selecting computer codes. The participation and support of a computation division in modifying the source program, configuration management, and pre- and post-processing of codes are among the subjects discussed. Specific examples illustrating the computer code selection process are described in the following problem areas: soil structure interaction, structural analysis of nuclear reactors, analysis of waste tanks where fluid structure interaction is important, analysis of equipment, structure-structure interaction, analysis of the operation of the superconductor supercollider which includes friction and transient temperature, and 3D analysis of the 10-meter telescope being built in Hawaii. Validation and verification of computer codes and their impact on the selection process are also discussed.

Zaslawsky, M.; Samaddar, S.K.

1991-12-31T23:59:59.000Z

62

THE STELLAR AND GAS KINEMATICS OF THE LITTLE THINGS DWARF IRREGULAR GALAXY NGC 1569  

SciTech Connect

In order to understand the formation and evolution of Magellanic-type dwarf irregular (dIm) galaxies, one needs to understand their three-dimensional structure. We present measurements of the stellar velocity dispersion in NGC 1569, a nearby post-starburst dIm galaxy. The stellar vertical velocity dispersion, {sigma}{sub z}, coupled with the maximum rotational velocity derived from H I observations, V{sub max}, gives a measure of how kinematically hot the galaxy is, and, therefore, indicates its structure. We conclude that the stars in NGC 1569 are in a thick disk with a V{sub max}/{sigma}{sub z} = 2.4 {+-} 0.7. In addition to the structure, we analyze the ionized gas kinematics from O III observations along the morphological major axis. These data show evidence for outflow from the inner starburst region and a potential expanding shell near supermassive star cluster (SSC) A. When compared to the stellar kinematics, the velocity dispersion of the stars increases in the region of SSC A supporting the hypothesis of an expanding shell. The stellar kinematics closely follow the motion of the gas. Analysis of high-resolution H I data clearly reveals the presence of an H I cloud that appears to be impacting the eastern edge of NGC 1569. Also, an ultra-dense H I cloud can be seen extending to the west of the impacting H I cloud. This dense cloud is likely the remains of a dense H I bridge that extended through what is now the central starburst area. The impacting H I cloud was the catalyst for the starburst, thus turning the dense gas into stars over a short timescale, {approx}1 Gyr. We performed a careful study of the spectral energy distribution using infrared, optical, and ultraviolet photometry, producing a state-of-the-art mass model for the stellar disk. This mass modeling shows that stars dominate the gravitational potential in the inner 1 kpc. The dynamical mass of NGC 1569, derived from V{sub max}, shows that the disk may be dark matter deficient in the inner region, although, when compared to the expected virial mass determined from halo abundance matching techniques, the dark matter profile seems to agree with the observed mass profile at a radius of 2.2 kpc.

Johnson, Megan [National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944 (United States); Hunter, Deidre A.; Zhang, Hong-Xin; Herrmann, Kimberly [Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001 (United States); Oh, Se-Heon [International Centre for Radio Astronomy Research (ICRAR), University of Western Australia, 35 Stirling Highway, Crawley, WA 6009 (Australia); Elmegreen, Bruce [IBM T. J. Watson Research Center, 1101 Kitchawan Road, Yorktown Hts., NY 10598 (United States); Brinks, Elias [Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB (United Kingdom); Tollerud, Erik, E-mail: mjohnson@nrao.edu, E-mail: dah@lowell.edu, E-mail: hxzhang@lowell.edu, E-mail: herrmann@lowell.edu, E-mail: se-heon.oh@uwa.edu.au, E-mail: bge@us.ibm.com, E-mail: E.Brinks@herts.ac.uk, E-mail: etolleru@uci.edu [Center For Cosmology, Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697 (United States)

2012-11-01T23:59:59.000Z

63

Project #3: Analysis of Structural Steel Update  

Science Conference Proceedings (OSTI)

... 100 105 108 Yawata "A 514 mod" (WEL-TEN 80C) 56 Plate 1 ... Task 5 - Characterize thermal excursions of steel ... Analysis completion target date ...

2012-10-30T23:59:59.000Z

64

Structure-Function Analysis of Edible Fats  

Science Conference Proceedings (OSTI)

This book summarizes current modern approaches in the quantification of the physical structure of fats and its relationship to macroscopic functionality. The approach taken here is a general one, where the principles and techniques presented can be applied

65

Structural analysis of network traffic flows  

Science Conference Proceedings (OSTI)

Network traffic arises from the superposition of Origin-Destination (OD) flows. Hence, a thorough understanding of OD flows is essential for modeling network traffic, and for addressing a wide variety of problems including traffic engineering, traffic ... Keywords: network traffic analysis, principal component analysis, traffic engineering

Anukool Lakhina; Konstantina Papagiannaki; Mark Crovella; Christophe Diot; Eric D. Kolaczyk; Nina Taft

2004-06-01T23:59:59.000Z

66

Analysis of the vesicular structure of basalts  

Science Conference Proceedings (OSTI)

We present a high resolution study of the void space geometry of vesiculated basaltic bombs (porosities in the range 60-80%) from three dimensional digitized images obtained by synchrotron X-ray tomography. The void space is composed of vesicles, the ... Keywords: Bubble size distribution, Image analysis, Vesicularity, Vesiculated basalts

H. Shin; W. B. Lindquist; D. L. Sahagian; S. -R. Song

2005-05-01T23:59:59.000Z

67

Novel Synthesis and Structural Analysis of Ferrihydrite  

SciTech Connect

Naturally occurring ferrihydrite is both impure and difficult to isolate, so the numerous applications and interesting properties of ferrihydrite have spurred the development of various synthetic techniques. Nearly all techniques are based on the hydrolysis of an iron salt and require careful control of temperature, pH, and concentration. In this Article, we report a new synthetic method which does not require such control and is perhaps the fastest and simplest route to synthesizing ferrhydrite. XRD, TEM, BET, and chemical purity characterizations show that the chemically pure, 2-line ferrihydrite product consists of crystallites 2-6 nm in diameter which aggregate to form mesoporous, high surface area agglomerates that are attractive candidates for the many adsorption applications of ferrihydrite. X-ray PDF data were also collected for the ferrihydrite product and refined against the hexagonal structural model recently proposed by Michel et al. These analyses suggest that ferrihydrite has a consistent, repeatable structure independent of variation in the synthetic method, water content of the sample, or particle size of the crystallites, and this structure can be adequately described by the proposed hexagonal model.

Smith, Stacey J.; Page, Katharine; Kim, Hyunjeong; Campbell, Branton J.; Boerio-Goates, Juliana; Woodfield, Brian F. (BYU); (LANL)

2012-07-25T23:59:59.000Z

68

Definition: Field Mapping-Structural Analysis | Open Energy Information  

Open Energy Info (EERE)

Field Mapping-Structural Analysis Field Mapping-Structural Analysis Jump to: navigation, search Dictionary.png Field Mapping-Structural Analysis Field mapping involves sending one or more geologist to a geothermal site of interest to collect and map surficial hydrologic, geologic and structural information that might be useful in identifying a hydrothermal system. View on Wikipedia Wikipedia Definition A geologic map or geological map is a special-purpose map made to show geological features. Rock units or geologic strata are shown by color or symbols to indicate where they are exposed at the surface. Bedding planes and structural features such as faults, folds, foliations, and lineations are shown with strike and dip or trend and plunge symbols which give these features' three-dimensional orientations. Stratigraphic contour

69

Magnetic Structure Analysis from Neutron Powder Diffraction Data Using GSAS  

NLE Websites -- All DOE Office Websites (Extended Search)

Magnetic Structure Analysis from Neutron Powder Diffraction Data Using GSAS Magnetic Structure Analysis from Neutron Powder Diffraction Data Using GSAS This set of web pages provides reference information from the Magnetic Structure Analysis from Neutron Powder Diffraction Data Using GSAS workshop presented at the 2006 American Conference on Neutron Scattering held in St. Charles, IL, June 18-22, 2006. Workshop Schedule: 9:00-9:05 am: Introduction (B.H. Toby) 9:05-9:50 am: History, Color symmetry & Shubnikov space groups (B. Chakoumous) Lecture notes: History and Color symmetry & Shubnikov space groups 9:50-10:20 am: Magnetic extinctions classes & common magnetic structure types (R.B. Von Dreele) Lecture Notes Break 10:50-11:45 am: Overview of representational analysis & FullProf implementation (L.C. Chapon) Lecture Notes and Accompanying files

70

Measuring architecture quality by structure plus history analysis  

Science Conference Proceedings (OSTI)

This case study combines known software structure and revision history analysis techniques, in known and new ways, to predict bug-related change frequency, and uncover architecture-related risks in an agile industrial software development project. We ...

Robert Schwanke, Lu Xiao, Yuanfang Cai

2013-05-01T23:59:59.000Z

71

Structural analysis of hydroxypropylphosphonic acid epoxidase : a fosfomycin biosynthetic enzyme  

E-Print Network (OSTI)

An X-ray crystallographic study of the fosfomycin biosynthetic enzyme hydroxypropylphosphonic acid epoxidase (HppE) from Streptomyces wedmorensis is presented. Structural analysis of this cupin mononuclear iron enzyme in ...

Higgins, Luke J. (Luke James)

2006-01-01T23:59:59.000Z

72

Protein MAS NMR methodology and structural analysis of protein assemblies  

E-Print Network (OSTI)

Methodological developments and applications of solid-state magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, with particular emphasis on the analysis of protein structure, are described in this thesis. ...

Bayro, Marvin J

2010-01-01T23:59:59.000Z

73

Logical structure analysis of scientific publications in mathematics  

Science Conference Proceedings (OSTI)

Even though the Linking Open Data cloud is constantly growing, there is a serious lack of published data sets related to the domain of academic mathematics. At the same time, since most scholarly publications in mathematics are well-structured and conventional, ... Keywords: document structure analysis, linked data, ontology

Valery Solovyev; Nikita Zhiltsov

2011-05-01T23:59:59.000Z

74

Reliability analysis of RC containment structures under combined loads  

SciTech Connect

This paper discusses a reliability analysis method and load combination design criteria for reinforced concrete containment structures under combined loads. The probability based reliability analysis method is briefly described. For load combination design criteria, derivations of the load factors for accidental pressure due to a design basis accident and safe shutdown earthquake (SSE) for three target limit state probabilities are presented.

Hwang, H.; Reich, M.; Kagami, S.

1984-01-01T23:59:59.000Z

75

Tempered Water Lower Port Connector Structural Analysis Verification  

SciTech Connect

Structural analysis of the lower port connection of the Tempered Water System of the Cold Vacuum Drying Facility was performed. Subsequent detailed design changes to enhance operability resulted in the need to re-evaluate the bases of the original analysis to verify its continued validity. This evaluation is contained in Appendix A of this report. The original evaluation is contained in Appendix B.

CREA, B.A.

2000-05-05T23:59:59.000Z

76

Iterative inverse kinematics with manipulator configuration control  

Science Conference Proceedings (OSTI)

A new method, termed the offset modification method (OM method), for solving the manipulator inverse kinematics problem is presented. The OM method works by modifying the link offset values of a manipulator until it is possible to derive closed-form inverse kinematics equations for the resulting manipulator (termed the model manipulator). This procedure allows one to derive a set of three nonlinear equations in three unknowns that, when numerically solved, give an inverse kinematics solution for the original manipulator. The OM method can be applied to manipulators with any number of degrees of freedom, as long as the manipulator satisfies a given set of conditions (Theorem 1). The OM method is tested on a 6-degree-of-freedom manipulator that has no known closed-form inverse kinematics equations. It is shown that the OM method is applicable to real-time manipulator control, can be used to guarantee convergence to a desired endpoint position and orientation (if it exists), and allows one to directly choose which inverse kinematics solution the algorithm will converge to (as specified in the model manipulator closed-form inverse kinematics equations). Applications of the method to other 6-DOF manipulator geometries and to redundant manipulators (i.e. greater than 6 DOF geometries) are discussed.

Grudic, G.Z.; Lawrence, P.D. [Univ. of British Columbia, Vancouver, British Columbia (Canada). Dept. of Electrical Engineering] [Univ. of British Columbia, Vancouver, British Columbia (Canada). Dept. of Electrical Engineering

1993-08-01T23:59:59.000Z

77

Robust, High-Throughput Analysis of Protein Structures  

NLE Websites -- All DOE Office Websites (Extended Search)

Robust, High-Throughput Analysis of Protein Structures Print Robust, High-Throughput Analysis of Protein Structures Print Scientists have developed a fast and efficient way to determine the structure of proteins, shortening a process that often takes years into a matter of days. The Structurally Integrated BiologY for Life Sciences (SIBYLS) beamline at the ALS has implemented the world's highest-throughput biological-solution x-ray scattering beamline enabling genomic-scale protein-structure characterization. Coupling brilliant x rays from one of the superconducting bend magnets at the ALS to liquid-handling robotics has enabled the collection of 96 samples in 4 hours. Importantly, the sample format and the amount of material required are practical for most biological problems. The beamline's high-throughput capability is set to have a large impact on many fields that require genomic-scale information, such as Berkeley Lab's bioenergy efforts and cancer biology studies.

78

Geothermal Resource Analysis And Structure Of Basin And Range Systems,  

Open Energy Info (EERE)

Analysis And Structure Of Basin And Range Systems, Analysis And Structure Of Basin And Range Systems, Especially Dixie Valley Geothermal Field, Nevada Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Geothermal Resource Analysis And Structure Of Basin And Range Systems, Especially Dixie Valley Geothermal Field, Nevada Details Activities (12) Areas (5) Regions (0) Abstract: Publish new thermal and drill data from the Dizie Valley Geothermal Field that affect evaluation of Basin and Range Geothermal Resources in a very major and positive way. Completed new geophysical surveys of Dizie Valley including gravity and aeromagnetics and integrated the geophysical, seismic, geological and drilling data at Dizie Valley into local and regional geologic models. Developed natural state mass and energy

79

Kinematics in Randers-Finsler geometry and secular increase of the astronomical unit  

E-Print Network (OSTI)

Kinematics in Finsler space is investigated. It is showed that the result based on the kinematics with a special Finsler structure is in good agreement with the reported value of secular trend in the astronomical unit, $d{\\rm AU}/dt=15\\pm4[{\\rm m/century}]$. The space deformation parameter $\\lambda$ in this special structure is very small with scale of $10^{-6}$ and should be a constant. This fact is consistent with the reported value of an anomalous secular eccentricity variation of the Moon's orbit.

X. Li; Z. Chang

2009-11-10T23:59:59.000Z

80

Selecting Earthquake Records for Nonlinear Dynamic Analysis of Structures  

Science Conference Proceedings (OSTI)

An area in earthquake risk reduction that needs an urgent examination is the selection of earthquake records for nonlinear dynamic analysis of structures. An often-mentioned shortcoming from results of nonlinear dynamic analyses of structures is that these results are limited to the type of records that these analyses use as input data. This paper proposes a procedure for selecting earthquake records for nonlinear dynamic analysis of structures. This procedure uses a seismic damage index evaluated using the hysteretic energy dissipated by a Single Degree of Freedom System (SDOF) representing a multi-degree-of freedom structure responding to an earthquake record, and the plastic work capacity of the system at collapse. The type of structural system is considered using simple parameters. The proposed method is based on the evaluation of the damage index for a suite of earthquake records and a selected type of structural system. A set of 10 strong ground motion records is analyzed to show an application of the proposed procedure for selecting earthquake records for structural design.

Rodriguez, Mario E. [Institute de Ingenieria, National University of Mexico, Mexico City (Mexico)

2008-07-08T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Highly damped kinematic coupling for precision instruments  

SciTech Connect

A highly damped kinematic coupling for precision instruments. The kinematic coupling provides support while causing essentially no influence to its nature shape, with such influences coming, for example, from manufacturing tolerances, temperature changes, or ground motion. The coupling uses three ball-cone constraints, each combined with a released flexural degree of freedom. This arrangement enables a gain of higher load capacity and stiffness, but can also significantly reduce the friction level in proportion to the ball radius divided by the distance between the ball and the hinge axis. The blade flexures reduces somewhat the stiffness of the coupling and provides an ideal location to apply constrained-layer damping which is accomplished by attaching a viscoelastic layer and a constraining layer on opposite sides of each of the blade flexures. The three identical ball-cone flexures provide a damped coupling mechanism to kinematically support the projection optics system of the extreme ultraviolet lithography (EUVL) system, or other load-sensitive apparatus.

Hale, Layton C. (Livermore, CA); Jensen, Steven A. (Livermore, CA)

2001-01-01T23:59:59.000Z

82

STATISTICAL ANALYSIS AND STRUCTURE OPTIMIZATION OF LARGE PHOTOVOLTAIC MODULE  

E-Print Network (OSTI)

on the output power of large Photovoltaic (PV) module by modeling each PV cell as a current source whose short. Photovoltaic (PV) is a simple and elegant method of harnessing the sun's energy. PV devices (solar cellsSTATISTICAL ANALYSIS AND STRUCTURE OPTIMIZATION OF LARGE PHOTOVOLTAIC MODULE RATHEESH R

Qiu, Qinru

83

Structural analysis of closure bolts for shipping casks  

Science Conference Proceedings (OSTI)

This paper identifies the active forces and moments in a closure bolt of a shipping cask. It examines the interactions of these forces/moments and suggest simplified methods for their analysis. The paper also evaluates the role that the forces and moments play in the structure integrity of the closure bolt and recommends stress limits and desirable practices to ensure its integrity.

Mok, G.C.; Fischer, L.E.

1993-04-01T23:59:59.000Z

84

The Effect of Jet-Streak Curvature on Kinematic Fields  

Science Conference Proceedings (OSTI)

A simple two-layer primitive equation (PE) model is used to study the effect of curvature on jet-streak kinematics, specifically vertical motion. Three types of vertical motion are studied: kinematic (PE) vertical motion, quasigeostrophic (QG) ...

James T. Moore; Glenn E. Vanknowe

1992-11-01T23:59:59.000Z

85

Wrist-Partitioned Inverse Kinematic Accelerations and Manipulator Dynamics  

E-Print Network (OSTI)

An efficient algorithm is presented for the calculation of the inverse kinematic accelerations for a 6 degree-of-freedom manipulator with a spherical wrist. The inverse kinematic calculation is shown to work synergistically ...

Hollerbach, John M.

1983-04-01T23:59:59.000Z

86

Compound nucleus studies withy reverse kinematics  

SciTech Connect

Reverse kinematics reactions are used to demonstrate the compound nucleus origin of intermediate mass particles at low energies and the extension of the same mechanism at higher energies. No evidence has appeared in our energy range for liquid-vapor equilibrium or cold fragmentation mechanisms. 11 refs., 12 figs.

Moretto, L.G.

1985-06-01T23:59:59.000Z

87

Structure  

NLE Websites -- All DOE Office Websites (Extended Search)

Structure Structure functions 1 NOTE: THE FIGURES IN THIS SECTION ARE INTENDED TO SHOW THE REPRESENTATIVE DATA. THEY ARE NOT MEANT TO BE COMPLETE COMPILATIONS OF ALL THE WORLD'S RELIABLE DATA. Q 2 (GeV 2 ) F 2 (x,Q 2 ) * 2 i x H1 ZEUS BCDMS E665 NMC SLAC 10 -3 10 -2 10 -1 1 10 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 -1 1 10 10 2 10 3 10 4 10 5 10 6 Figure 16.6: The proton structure function F p 2 measured in electromagnetic scattering of positrons on protons (collider experiments ZEUS and H1), in the kinematic domain of the HERA data, for x > 0.00006 (cf. Fig. 16.9 for data at smaller x and Q 2 ), and for electrons (SLAC) and muons (BCDMS, E665, NMC) on a fixed target. Statistical and systematic errors added in quadrature are shown. The data are plotted as a function of Q 2 in bins of fixed x. Some points have been slightly offset in Q 2 for clarity. The ZEUS binning in x is used in this plot; all other data are rebinned to the x values of

88

Computational derivation of valid kinematic limbs of spatial 3-dof parallel mechanisms without redundant constraint  

Science Conference Proceedings (OSTI)

A computational derivation of valid kinematic limbs for spatial 3-DOF parallel mechanisms (PMs) without redundant constraint is studied based on contracted graphs, topological graphs, and basic joints. First, some contracted graphs without any binary ... Keywords: Chain structure, Contracted graph, Limb, Parallel mechanism, Topological graph

Yi Lu; Yang Lu; Ling Ding; Nijia Ye

2012-07-01T23:59:59.000Z

89

Ionized gas and stellar kinematics of seventeen nearby spiral galaxies  

E-Print Network (OSTI)

Ionized gas and stellar kinematics have been measured along the major axes of seventeen nearby spiral galaxies of intermediate to late morphological type. We discuss the properties of each sample galaxy distinguishing between those characterized by regular or peculiar kinematics. In most of the observed galaxies ionized gas rotates more rapidly than stars and have a lower velocity dispersion, as is to be expected if the gas is confined in the disc and supported by rotation while the stars are mostly supported by dynamical pressure. In a few objects, gas and stars show almost the same rotational velocity and low velocity dispersion, suggesting that their motion is dominated by rotation. Incorporating the spiral galaxies studied by Bertola et al. (1996), Corsini et al. (1999, 2003) and Vega Beltran et al. (2001) we have compiled a sample of 50 S0/a-Scd galaxies, for which the major-axis kinematics of the ionized gas and stars have been obtained with the same spatial (~1'') and spectral (~50km/s) resolution, and measured with the same analysis techniques. This allowed us to address the frequency of counterrotation in spiral galaxies. It turns out that less than 12% and less than 8% (at the 95% confidence level) of the sample galaxies host a counterrotating gaseous and stellar disc, respectively. The comparison with S0 galaxies suggests that the retrograde acquisition of small amounts of external gas gives rise to counterrotating gaseous discs only in gas-poor S0s, while in gas-rich spirals the newly acquired gas is swept away by the pre-existing gas. Counterrotating gaseous and stellar discs in spirals are formed only from the retrograde acquisition of large amounts of gas exceeding that of pre-existing gas, and subsequent star formation, respectively.

A. Pizzella; E. M. Corsini; J. C. Vega-Beltran; F. Bertola

2004-04-28T23:59:59.000Z

90

Membrane dish analysis: A summary of structural and optical analysis capabilities  

DOE Green Energy (OSTI)

Research at SERI within the Department of Energy's Solar Thermal Technology Program has focused on the development of membrane dish concentrators for space and terrestrial power applications. As potentially lightweight, inexpensive, high-performance structures, they are excellent candidates for space-deployable energy sources as well as cost-effective terrestrial energy concepts. A thorough engineering research treatment of these types of structures consists primarily of two parts: (1) structural mechanics of the membrane and ring support and (2) analysis and characterization of the concentrator optical performance. It is important to understand the effects of the membrane's structure and support system on the optical performance of the concentrator. This requires an interface between appropriate structural and optical models. Until recently, such models and the required interface have not existed. This report documents research that has been conducted at SERI in this area. It is a compilation of several papers describing structural models of membrane dish structures and optical models used to predict dish concentrator optical and thermal performance. The structural models were developed under SERI subcontract by Dr. Steele and Dr. Balch of Stanford University. The optical model was developed in-house by SERI staff. In addition, the interface between the models is described. It allows easy and thorough characterization of membrane dish systems from the mechanics to the resulting optical performance. The models described herein have been and continue to be extremely useful to SERI, industry, and universities involved with the modeling and analysis of lightweight membrane concentrators for solar thermal applications.

Steele, C.R.; Balch, C.D.; Jorgensen, G.J.; Wendelin, T.; Lewandowski, A.

1991-11-01T23:59:59.000Z

91

Structure-Function Analysis of Edible FatsChapter 1 Characterization of the Nano-Structure of Triacylglycerol Crystal Networks  

Science Conference Proceedings (OSTI)

Structure-Function Analysis of Edible Fats Chapter 1 Characterization of the Nano-Structure of Triacylglycerol Crystal Networks Methods and Analyses eChapters Food Science & Technology Health - Nutrition - Biochemistry Processing Methods

92

Analysis of community structure in networks of correlated data  

Science Conference Proceedings (OSTI)

We present a reformulation of modularity that allows the analysis of the community structure in networks of correlated data. The new modularity preserves the probabilistic semantics of the original definition even when the network is directed, weighted, signed, and has self-loops. This is the most general condition one can find in the study of any network, in particular those defined from correlated data. We apply our results to a real network of correlated data between stores in the city of Lyon (France).

Gomez, S.; Jensen, P.; Arenas, A.

2008-12-25T23:59:59.000Z

93

Dynamical Analysis of the Structure of Neutron Star Critical Collapses  

E-Print Network (OSTI)

Jin et al reported that axisymmetric simulations of NS-like objects with polytropic EOS undergo critical gravitational collapse. As the critical collapse observed via fine-tuning of the adiabatic index $\\Gamma$, they conjecture that critical phenomena may occur in realistic astrophysical scenarios. To clarify the implications this numerical observation has on realistic astrophysical scenarios, here, we perform dynamical analysis on the structure of the critical collapse observed in the former work. We report the time scales and oscillation frequencies exhibited by the critical solution and compare these results with values obtained from analytic perturbative mode analysis of equilibrium TOV configurations. We also establish the universality of the critical solution with respect to a 1-parameter family of initial data as well as the phase space manifold of the critical collapse.

M. -B. Wan; K. -J. Jin; W. -M. Suen

2008-07-10T23:59:59.000Z

94

The 12/13 January 1988 Narrow Cold-Frontal Rainband Observed during MFDP/FRONTS 87. Part I: Kinematics and Thermodynamics  

Science Conference Proceedings (OSTI)

The kinematic and thermodynamic structure of a narrow cold-frontal rainband (NCFR) observed during the English–French–German MFDP/FRONTS 87 experiment is presented. Radiosonde data indicated a very weak convective instability below 1500-m ...

Frank Roux; Virginie Marécal; Danièle Hauser

1993-04-01T23:59:59.000Z

95

Structural analysis of a reflux pool-boiler solar receiver  

DOE Green Energy (OSTI)

Coupled thermal-structural finite element calculations of a reflux pool-boiler solar receiver were performed to characterize the operating stresses and to address issues affecting the service life of the receiver. Analyses performed using shell elements provided information for receiver material selection and design optimization. Calculations based on linear elastic fracture mechanics principles were performed using continuum elements to assess the vulnerability of a seam-weld to fatigue crack growth. All calculations were performed using ABAQUS, a general purpose finite element code, and elements specifically formulated for coupled thermal-structural analysis. Two materials were evaluated: 316L SS and Haynes 230 alloys. The receiver response was simulated for a combination of structural and thermal loads that represent the startup and operating conditions of the receiver. For both materials, maximum stresses in the receiver developed shortly after startup due to uneven temperature distribution across the receiver surface. The largest effective stress was near yield in the 316L SS receiver and below 39 percent of yield in the Haynes 230 receiver. The calculations demonstrated that stress reductions of over 25 percent could be obtained by reducing the aft dome thickness to one closer to the absorber. The fatigue calculations demonstrated that the stress distribution near the seam-weld notch depends primarily on the structural load created by internal pressurization of the receiver rather than the thermal, indicating that the thermal loads can be neglected when assessing the stress intensity near the seam-weld notch. The stress intensity factor, computed using the J-integral method and crack opening-displacement field equations, was significantly below the fatigue threshold for most steels. The calculations indicated that the weld notch was always loaded in compression, a condition which is not conducive to fatigue crack growth. 15 refs., 30 figs., 3 tabs.

Hoffman, E.L.; Stone, C.M.

1991-06-01T23:59:59.000Z

96

Radial transmission line analysis of multi-layer structures  

Science Conference Proceedings (OSTI)

The analysis of multi-layer beam tubes is a standard problem and involves axially propagating waves. This treatment is ill suited to a short multi-layer structure such as the present example of a ferrite covered ceramic break in the beam tube at the ERL photo-cathode electron gun. This paper demonstrates that such structure can better be treated by radial wave propagation. The theoretical method is presented and numerical results are compared with measured network analyser data and Microwave Studio generated simulations. The results confirm the concept of radial transmission lines as a valid analytical method. An Energy Recovery Linac (ERL) is being constructed at this laboratory for the purpose of research towards an envisioned Electron Ion Collider. One of the pertinent topics is damping of Higher Order Modes (HOM). In this ERL, the damping is provided by ferrite absorbers in the beam tube. A modified version thereof, a ceramic break surrounded by ferrite, is planed for the superconducting electron gun. The damper here is located at room temperature just outside of the gun. If used in a cavity chain, the ceramic break is in the vacuum tube at helium temperature whereas the ferrite is moved into the cryostat insulating vacuum allowing higher temperatures. The general properties of the ferrite HOM dampers have been published but are more detailed in this paper.

Hahn, H.; Hammons, L.

2011-03-28T23:59:59.000Z

97

Challenges in computer applications for ship and floating structure design and analysis  

Science Conference Proceedings (OSTI)

This paper presents a review on the key research areas in the design and analysis of ships and floating structures. The major areas of computer application are identified in several stages of ship/floating structure design and analysis with the principal ... Keywords: Boundary element method, Computational fluid dynamics, Computer applications, Computer-aided ship and floating structure design, Finite element analysis, Hydrodynamics, Production, Structures

R. Sharma; Tae-wan Kim; Richard Lee Storch; Hans (J. J. ) Hopman; Stein Ove Erikstad

2012-03-01T23:59:59.000Z

98

Nuclear Star Clusters - Structure and Stellar Populations  

E-Print Network (OSTI)

This is an overview of nuclear star cluster observations, covering their structure, stellar populations, kinematics and possible connection to black holes at the centers of galaxies.

Neumayer, Nadine

2012-01-01T23:59:59.000Z

99

Uncertainty quantification in kinematic wave models  

SciTech Connect

We developed a probabilistic approach to quantify parametric uncertainty in first-order hyperbolic conservation laws (kinematic wave equations). The approach relies on the derivation of a deterministic equation for the cumulative density function (CDF) of the system state, in which probabilistic descriptions (probability density functions or PDFs) of the system parameters and/or initial and boundary conditions serve as inputs. In contrast to PDF equations, which are often used in other contexts, CDF equations allow for straightforward and unambiguous determination of boundary conditions with respect to sample variables.The accuracy and robustness of solutions of the CDF equation for one such system, the Saint-Venant equations of river flows, were investigated via comparison with Monte Carlo simulations.

Wang, Peng; Tartakovsky, Daniel M.

2012-10-01T23:59:59.000Z

100

Efficient buckling and free vibration analysis of cyclically repeated space truss structures  

Science Conference Proceedings (OSTI)

Eigenproblems play a key role in the stability and free vibration analysis of structures. In large structural models, the solutions of these problems need a considerable computational effort. There are special types of structures whose special properties ... Keywords: Buckling load, Cyclic symmetry, Decomposition, Eigenproblems, Free vibration, Space structures

K. Koohestani; A. Kaveh

2010-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

WALPERSDORF ET AL.: KINEMATICS OF THE SULA BLOCK, INDONESIA 1 Determining the Sula block kinematics in the  

E-Print Network (OSTI)

WALPERSDORF ET AL.: KINEMATICS OF THE SULA BLOCK, INDONESIA 1 Determining the Sula block kinematics in the triple junction area in Indonesia by GPS Andrea Walpersdorf 1 , and Christophe Vigny Ecole Normale Sup, Indonesia Abstract. The point of convergence of the Eurasian, Philippine, and Australian Plates, is situated

Vigny, Christophe

102

Conserved Variable Analysis of the Convective Boundary Layer Thermodynamic Structure over the Tropical Oceans  

Science Conference Proceedings (OSTI)

An analysis of FGGE dropwindsonde data using conserved thermodynamic variables shows mixing line structures for the convective boundary layer over the equatorial Pacific. Deeper boundary layers show a double structure. Reversals of the gradients ...

Alan K. Betts; Bruce A. Albrecht

1987-01-01T23:59:59.000Z

103

Graph of words embedding for molecular structure-activity relationship analysis  

Science Conference Proceedings (OSTI)

Structure-Activity relationship analysis aims at discovering chemical activity of molecular compounds based on their structure. In this article we make use of a particular graph representation of molecules and propose a new graph embedding procedure ...

Jaume Gibert; Ernest Valveny; Horst Bunke

2010-11-01T23:59:59.000Z

104

RF, Thermal and Structural Analysis of the 201.25 MHz Muon Ionization Cooling Cavity  

E-Print Network (OSTI)

THERMAL AND STRUCTURAL ANALYSIS OF THE 201.25 MHZ MUON IONIZATION COOLINGthe thermal performance of the cavity, including the coolingthermal and structural behavior of the prototype 201.25 MHz cavity for a muon ionization cooling

Virostek, S.; Li, D.

2005-01-01T23:59:59.000Z

105

The design and analysis of tension fabric structures  

E-Print Network (OSTI)

Although tensioned fabric structures are increasingly in demand, since they are comparatively new to the engineering world, there are relatively limited resources available about such structures. This report reviews the ...

Son, Miriam Euni

2007-01-01T23:59:59.000Z

106

Introduction to Orthonormal Wavelet Analysis with Shift Invariance: Application to Observed Atmospheric Blocking Spatial Structure  

Science Conference Proceedings (OSTI)

Orthonormal wavelet analysis (OWA) is a special form of wavelet analysis, especially suitable for analyzing spatial structures, such as atmospheric fields. For this purpose, OWA is much more efficient and accurate than the nonorthogonal wavelet ...

Aimé Fournier

2000-12-01T23:59:59.000Z

107

Model and Seismic Analysis of Large-scale Wind Turbine Tower Structure  

Science Conference Proceedings (OSTI)

The working condition of wind turbine tower structure with a massive engine room and revolving wind wheels is very complex. The paper simplify the wind turbine tower model with finite element analysis software --ANSYS, completed modal analysis firstly, ... Keywords: wind turbine tower, model analysis, resonance, time-history analysis, dynamic

Xiang Liu; Jiangtao Kong

2012-05-01T23:59:59.000Z

108

Amazon Coastal Squall Lines. Part I: Structure and Kinematics  

Science Conference Proceedings (OSTI)

Mesoscale to synoptic-scale squall lines that form along the northeastern coast of South America as sea-breeze-induced instability lines and propagate through the Amazon Basin are investigated using data collected during the April–May 1987 Amazon ...

Michael Garstang; Harold L. Massie Jr.; Jeffrey Halverson; Steven Greco; John Scala

1994-04-01T23:59:59.000Z

109

Kinematic soil-structure interaction from strong motion recordings  

E-Print Network (OSTI)

AND GEOENVIRONMENTAL ENGINEERING © ASCE / APRIL 2003 / 335must be ?led with the ASCE Managing Editor. The manuscriptNo. 4, April 1, 2003. ©ASCE, ISSN 1090-0241/ arises from

Kim, Seunghyun; Stewart, Jonathan P

2003-01-01T23:59:59.000Z

110

The Three-Dimensional Structure and Kinematics of Drizzling Stratocumulus  

Science Conference Proceedings (OSTI)

Drizzling marine stratocumulus are examined using observations from the 2001 East Pacific Investigation of Climate Stratocumulus (EPIC Sc) field experiment. This study uses a unique combination of satellite and shipborne Doppler radar data ...

Kimberly K. Comstock; Sandra E. Yuter; Robert Wood; Christopher S. Bretherton

2007-11-01T23:59:59.000Z

111

Kinematic, Thermodynamic, and Visual Structure of Low-Reflectivity Microbursts  

Science Conference Proceedings (OSTI)

On 9 July 1987, a series of low-reflectivity microbursts were studied over Colorado using dual-Doppler analyses, cloud photogrammetry, and in situ measurements collected by aircraft. These types of wind-shear events are particularly hazardous to ...

Roger M. Wakimoto; Cathy J. Kessinger; David E. Kingsmill

1994-01-01T23:59:59.000Z

112

Geothermal Resource Analysis And Structure Of Basin And Range...  

Open Energy Info (EERE)

Buildings Clean Energy Economy Coordinated Low Emissions Assistance Network Geothermal Incentives and Policies International Clean Energy Analysis Low Emission Development...

113

Industrial structures : an analysis and transformation of their formal characteristics  

E-Print Network (OSTI)

Industrial structures such as blast furnaces, oil refineries, gravel crushers etc. are often beautiful and fascinating. Furthermore, they exemplify certain formal and organizational characteristics which could be incorporated ...

Strub, Damon

1988-01-01T23:59:59.000Z

114

Trends of Atlantic Wave Extremes as Simulated in a 40-Yr Wave Hindcast Using Kinematically Reanalyzed Wind Fields  

Science Conference Proceedings (OSTI)

In this study, seasonal extremes of wave height in the North Atlantic are analyzed. The analysis is based on a 40-yr (1958–97) numerical wave hindcast using an intensive kinematic reanalysis of wind fields. Changes in the ocean wave extremes are ...

Xiaolan L. Wang; Val R. Swail

2002-05-01T23:59:59.000Z

115

FDTD analysis on PBG via structures printed on CPW lines  

Science Conference Proceedings (OSTI)

There have recently been a number of studies on the photonic band-gap (PBG) structures in microelectronics and communications areas. In most of the studies, the PBG filtering behaviour was fulfilled by a periodic pattern of perforations on the ground ... Keywords: FDTD method, PBG structures, conductive vias

Ming-Sze Tong; Tae-Gyu Chang

2007-05-01T23:59:59.000Z

116

Frequency Monitoring and Simulation Analysis for Historical Structures Being Retrofitted  

Science Conference Proceedings (OSTI)

Many historical structures now need to be retrofitted to meet the requirements of fast developing cities. To ensure the safety of a historical masonry building during its retrofitting, natural frequency of the structure was measured through ambient vibrating ... Keywords: Historical masonry building, Retrofit, Monitoring, Simulation

Chao Wang, Bin Peng, Peng Wang

2013-01-01T23:59:59.000Z

117

On the Kinematics of Undulator Girder Motion  

SciTech Connect

The theory of rigid body kinematics is used to derive equations that govern the control and measurement of the position and orientation of undulator girders. The equations form the basis of the girder matlab software on the LCLS control system. The equations are linear for small motion and easily inverted as desired. For reference, some relevant girder geometrical data is also given. Equations 6-8 relate the linear potentiometer readings to the motion of the girder. Equations 9-11 relate the cam shaft angles to the motion of the girder. Both sets are easily inverted to either obtain the girder motion from the angles or readings, or, to find the angles and readings that would give a desired motion. The motion of any point on the girder can be calculated by applying either sets of equations to the two cam-planes and extrapolating in the z coordinate using equation 19. The formulation of the equations is quite general and easily coded via matrix and vector methods. They form the basis of the girder matlab software on the LCLS control system.

Welch, J

2011-08-18T23:59:59.000Z

118

A kinematic wave theory of capacity drop  

E-Print Network (OSTI)

Capacity drop at active bottlenecks is one of the most puzzling traffic phenomena, but a thorough understanding is practically important for designing variable speed limit and ramp metering strategies. In this study, we attempt to develop a simple model of capacity drop within the framework of kinematic wave theory based on the observation that capacity drop occurs when an upstream queue forms at an active bottleneck. In addition, we assume that the fundamental diagrams are continuous in steady states. This assumption is consistent with observations and can avoid unrealistic infinite characteristic wave speeds in discontinuous fundamental diagrams. A core component of the new model is an entropy condition defined by a discontinuous boundary flux function. For a lane-drop area, we demonstrate that the model is well-defined, and its Riemann problem can be uniquely solved. We theoretically discuss traffic stability with this model subject to perturbations in density, upstream demand, and downstream supply. We clarify that discontinuous flow-density relations, or so-called "discontinuous" fundamental diagrams, are caused by incomplete observations of traffic states. Theoretical results are consistent with observations in the literature and are verified by numerical simulations and empirical observations. We finally discuss potential applications and future studies.

Wen-Long Jin; Qi-Jian Gan; Jean-Patrick Lebacque

2013-10-09T23:59:59.000Z

119

Seismic fragility analysis of equipment and structures in a Memphis Electric substation. Technical report  

SciTech Connect

This report presents a seismic fragility analysis of equipment and structures in an electric substation in Memphis, Tennessee. These include the pothead structure, 115 kv switch structure, 97 kv lightning arresters, control house, capacitor banks, 115/12 kv transformers, 12 kv regulators, 115 kv oil circuit breakers, and 12 kv oil circuit breakers. The results from this fragility analysis provide the expected performance of equipment and structures in a substation. They can also be used to evaluate the seismic performance of the entire electric substation and to perform a system reliability analysis of the electric transmission system.

Huo, J.R.; Hwang, H.H.M.

1995-08-10T23:59:59.000Z

120

Kinematic model for postorogenic Basin and Range extension | Open Energy  

Open Energy Info (EERE)

Kinematic model for postorogenic Basin and Range extension Kinematic model for postorogenic Basin and Range extension Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Kinematic model for postorogenic Basin and Range extension Details Activities (1) Areas (1) Regions (0) Abstract: The Raft River extensional shear zone is exposed in the Albion-Raft River-Grouse Creek metamorphic core complex. Several studies of ductile deformation have shown that it accommodated crustal stretching in Tertiary time during late orogenic collapse of the thickened Cordilleran crust. Progressive deformation that results from mixed pure and simple shear produces a complex strain pattern along the shear zone. The authors propose a numerical kinematic model that relates strain variations in the shear zone to the different amounts of extension between the brittlely

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

A kinematic coupling based 6 degrees of freedom dynamometer  

E-Print Network (OSTI)

A new 6-degree of freedom dynamometer is presented. Six load cells measure the normal forces at the contact points of a three groove kinematic coupling. Three toggle clamps are used to preload the machine, so that it does ...

Moreu Gamazo, Jaime

2009-01-01T23:59:59.000Z

122

Kinematics of the Secondary Eyewall Observed in Hurricane Rita (2005)  

Science Conference Proceedings (OSTI)

Airborne Doppler radar data collected from the concentric eyewalls of Hurricane Rita (2005) provide detailed three-dimensional kinematic observations of the secondary eyewall feature. The secondary eyewall radar echo shows a ring of heavy ...

Anthony C. Didlake Jr.; Robert A. Houze Jr.

2011-08-01T23:59:59.000Z

123

Practical dynamic analysis of structures laterally vibrating in contact with water  

Science Conference Proceedings (OSTI)

This paper proposes a practical formulation to investigate the dynamic response of structures laterally vibrating in contact with water on one or both sides. The proposed technique accounts for structure's flexibility, soil flexibility, varying water ... Keywords: Dynamic analysis, Finite elements, Fluid-structure interaction, Hydrodynamic loads, Simplified formulations, Vibration periods

Benjamin Miquel; Najib Bouaanani

2011-12-01T23:59:59.000Z

124

Structural analysis of automating measurements of floor gradients  

E-Print Network (OSTI)

It is useful for one owning or buying a house to be able to assess its structure and identify the existence and severity of any damage. No previously existing method appears to make this assessment easily available. This ...

Caplan, Noah S

2011-01-01T23:59:59.000Z

125

Analysis of blast mitigation strategies exploiting fluid-structure interaction  

E-Print Network (OSTI)

Blast attacks have become the most pervasive threat in both civil and military contexts. However, there is currently a limited understanding of the mechanisms of loading, damage and failure of structures, and injury to ...

Kambouchev, Nayden Dimitrov, 1980-

2007-01-01T23:59:59.000Z

126

Structural and economic analysis of capesize bulk carriers  

E-Print Network (OSTI)

Structural failures of bulk carriers continue to account for the loss of many lives every year. Capes are particularly vulnerable to cracking because of their large length, their trade in high density cargos, and the high ...

Hadjiyiannis, Nicholas

2010-01-01T23:59:59.000Z

127

Structural Analysis of Airborne Flux Estimates over a Region  

Science Conference Proceedings (OSTI)

Aircraft-based observations of turbulence fields of velocity, moisture, and temperature are used to study coherent turbulent structures that dominate turbulent transfer of moisture and heat above three different eco-systems. Flux traces are ...

Paulo Caramori; Peter Schuepp; Raymond Desjardins; Ian MacPherson

1994-05-01T23:59:59.000Z

128

Dynamic analysis of concrete coupled wall structures : a parametric study  

E-Print Network (OSTI)

Concrete coupled wall structure is a system that can efficiently dissipate energy under the effect of lateral loads. It has been widely used in medium height buildings for several decades. While researchers have conducted ...

Huang, Elaine Annabelle, 1981-

2005-01-01T23:59:59.000Z

129

Thermal Analysis of a SHIELD Electromigration Test Structure  

Science Conference Proceedings (OSTI)

The steady state and transient thermal behavior of an electromigration test structure was analyzed. The test structure was a Sandia SHIELD (Self-stressing HIgh fregquency rELiability Device) electromigration test device manufactured by an outside vendor. This device has a high frequency oscillator circuit, a buffer circuit to isolate and drive the metal line to the tested (DUT), the DUT to be electromigrated itself, a metal resistance thermometry monitor, and a heater elment to temperature accelerate the electromigration effect.

Benson, David A.; Bowman, Duane J.; Mitchell, Robert T.

1999-05-01T23:59:59.000Z

130

CommentSpace: structured support for collaborative visual analysis  

Science Conference Proceedings (OSTI)

Collaborative visual analysis tools can enhance sensemaking by facilitating social interpretation and parallelization of effort. These systems enable distributed exploration and evidence gathering, allowing many users to pool their effort as they discuss ... Keywords: asynchronous collaboration, information visualization, social data analysis, tagging

Wesley Willett; Jeffrey Heer; Joseph Hellerstein; Maneesh Agrawala

2011-05-01T23:59:59.000Z

131

Quantitative Analysis of Vascular Structures Using Image Processing  

Science Conference Proceedings (OSTI)

Vascularization, the growth of new blood vessels form the existing vessels, implies many pathological processes and needs to be reasonably quantified. However, most vascular analysis is done manually. This is a tedious and laborious work without consistence. ... Keywords: vascularization, angiostatic analysis, image processing

Yi-Chun Lin; Pei-Ju Chiang

2012-07-01T23:59:59.000Z

132

Development of integrated system for progressive collapse analysis of building structures considering dynamic effects  

Science Conference Proceedings (OSTI)

In this study the integrated system for progressive collapse analysis, which can evaluate the damage level of every member and automatically construct the modified structural model for the next analysis step, has been developed. The existing nonlinear ... Keywords: Damage index, Graphic user interface, Integrated system, Nonlinear analysis, Progressive collapse

Hyun-Su Kim; Jinkoo Kim; Da-Woon An

2009-01-01T23:59:59.000Z

133

Structural Analysis of Complex Materials - Programmaster.org  

Science Conference Proceedings (OSTI)

Application of Line Profile Analysis for the Study of Dislocations in Deep Earth ... H-3: The Competition between the Stress Relaxation and Load Transfer in ... of Cube and Goss Texture after Primary Recrystallization in Electrical Steels.

134

Structural Analysis on Hanford Single Shell Waste Tanks  

Thermal Profile for Type II Tanks 10. Thermal and Operating Loads Analysis ... Ultimate Load Evaluation at 2010 in-situ Conditions Year 64 @ 155 oF (1947 – 2010)

135

Molecular simulation analysis of structural variations in lipoplexes  

E-Print Network (OSTI)

We use a coarse-grained molecular model to study the self-assembly process of complexes of cationic and neutral lipids with DNA molecules ("lipoplexes") - a promising nonviral carrier of DNA for gene therapy. We identify the resulting structures through direct visualization of the molecular arrangements and through calculations of the corresponding scattering plots. The latter approach provides a means for comparison with published data from X-ray scattering experiments. Consistent with experimental results, we find that upon increasing the stiffness of the lipid material, the system tends to form lamellar structures. Two characteristic distances can be extracted from the scattering plots of lamellar complexes - the lamellar (interlayer) spacing and the DNA-spacing within each layer. We find a remarkable agreement between the computed values of these two quantities and the experimental data [J. O. R\\"{a}dler, I. Koltover, T. Salditt and C. R. Safinya, Science Vol. 275, 810 (1997)] over the entire range of mole fractions of charged lipids (CLs) studied experimentally. A visual inspection of the simulated systems reveals that, for very high fractions of CLs, disordered structures consisting of DNA molecules bound to small membrane fragments are spontaneously formed. The diffraction plots of these non-lamellar disordered complexes appear very similar to that of the lamellar structure, which makes the interpretation of the X-ray data ambiguous. The loss of lamellar order may be the origin of the observed increase in the efficiency of lipoplexes as gene delivery vectors at high charge densities.

Oded Farago; Niels Grønbech-Jensen

2011-03-03T23:59:59.000Z

136

An Analysis of Mesoscale VAS Retrievals Using Statistical Structure Functions  

Science Conference Proceedings (OSTI)

Statistical structure functions are used to evaluate sounding data from the 6–7 March day of the 1982 AVE/VAS Ground Truth Field Experiment. Functional analyses are performed for five observation times starting at 1200 GMT 6 March and ending at ...

Henry E. Fuelberg; Paul J. Meyer

1986-01-01T23:59:59.000Z

137

Lagrangian Coherent Structure Analysis of Terminal Winds Detected by Lidar. Part I: Turbulence Structures  

Science Conference Proceedings (OSTI)

The accurate real-time detection of turbulent airflow patterns near airports is important for safety and comfort in commercial aviation. In this paper, a method is developed to identify Lagrangian coherent structures (LCS) from horizontal lidar ...

Wenbo Tang; Pak Wai Chan; George Haller

2011-02-01T23:59:59.000Z

138

Analysis of Haplotype Structure in the Bovine Major Histocompatibility Complex  

E-Print Network (OSTI)

The goal of this project was to identify and characterize polymorphic markers spanning regions of the bovine major histocompatibility complex (BoLA) to analyze patterns of genetic variation and haplotype structure across diverse cattle breeds with various breed histories and selection pressures. Genetic markers that demonstrated sufficient levels of polymorphism, locus specificity, Mendelian inheritance, and the accurate typing of alleles across diverse haplotypes were chosen to define separate haplotype structures for the BoLA IIb and BoLA IIa-III-I regions and to evaluate breakpoints in linkage disequilibrium within the regions surrounding BoLA IIa-III-I. A total of 23 microsatellites, two SNPSTRs, 62 SNPs, and the alleles of three class IIa genes were selected for use in this study. These markers revealed eleven recombination events, low levels of recombination in BoLA IIa-III-I, a sharp break in haplotype structure in the region centromeric to class IIa, prolonged linkage disequilibrium in the extended class I region, strong conservation of BoLA IIa-III-I haplotype structure, BoLA IIa-III-I homozygous haplotype identity across seven different breeds of cattle, and a small number of common BoLA IIa-III-I haplotypes within the Angus and Holstein breeds. This work demonstrated that 52 SNPs from the Illumina 50K SNPchip could accurately predict BoLA IIa-III-I haplotypes. These 52 SNPs represent tagSNPs that can predict BoLA IIa-III-I genetic variation and could offer a cost-effective means for screening large sample sizes for haplotype/disease association studies in the future.

Fritz, Krista L.

2009-12-01T23:59:59.000Z

139

An Introduction to Metabolic Networks and Their Structural Analysis  

Science Conference Proceedings (OSTI)

There has been a renewed interest for metabolism in the computational biology community, leading to an avalanche of papers coming from methodological network analysis as well as experimental and theoretical biology. This paper is meant to serve as an ... Keywords: Introductory and Survey, Graph Theory, Biology and genetics, metabolic networks, modularity, evolution, reconstruction, modelling

Vincent Lacroix; Ludovic Cottret; Patricia Thébault; Marie-France Sagot

2008-10-01T23:59:59.000Z

140

Structural Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle  

Open Energy Info (EERE)

Structural Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle Structural Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle Aerial Photography, NAS Fallon Geothermal Exploration Project, Dixie Valley, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Structural Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle Aerial Photography, NAS Fallon Geothermal Exploration Project, Dixie Valley, Nevada Abstract The goal of this study is to map and characterize Quaternary faults in southern Dixie Valley for the Department of the Navy Geothermal Program Office's NAS Fallon Geothermal Exploration Project. We will use this information to better characterize the regional structure and geothermal resource potential of the area,with a focus on determining the structural

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Lipid Analysis and Lipidomics: New Techniques & ApplicationChapter 19 Waxes and Sterols: Structures and Chemistry  

Science Conference Proceedings (OSTI)

Lipid Analysis and Lipidomics: New Techniques & Application Chapter 19 Waxes and Sterols: Structures and Chemistry Methods and Analyses eChapters Methods - Analyses Books AOCS Press Downloadable pdf of Chapter 19

142

The role of computer-aided drafting, analysis, and design software in structural engineering practice  

E-Print Network (OSTI)

Perhaps the greatest innovation in engineering in the last fifty years, computer software has changed the way structural engineers conduct nearly every aspect of their daily business. Computer-aided drafting, analysis, and ...

De los Reyes, Adrian

2006-01-01T23:59:59.000Z

143

Design of structurally-sound masonry buildings using 3D static analysis  

E-Print Network (OSTI)

In the design of buildings, structural analysis is traditionally performed after the aesthetic design has been determined and has little in uence on the overall form. This thesis presents methods to integrate architectural ...

Whiting, Emily Jing Wei

2012-01-01T23:59:59.000Z

144

Structure-Function Analysis of Edible FatsChapter 5 Rheology and Mechanical Properties of Fats  

Science Conference Proceedings (OSTI)

Structure-Function Analysis of Edible Fats Chapter 5 Rheology and Mechanical Properties of Fats Methods and Analyses eChapters Food Science & Technology Health - Nutrition - Biochemistry Processing Methods - Analyses Books AOCS Press

145

Empirical Orthogonal Function Analysis of the Weakly Convective Atmospheric Boundary Layer. Part I: Eddy Structures  

Science Conference Proceedings (OSTI)

Three-dimensional empirical orthogonal functions (EOFs), representing atmospheric turbulence structures, are determined from a large-eddy simulation of a weakly convective, planetary boundary layer. The method of analysis is based on Lumley's ...

D. Keith Wilson

1996-03-01T23:59:59.000Z

146

Detection of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich Effect  

E-Print Network (OSTI)

Using high-resolution microwave sky maps made by the Atacama Cosmology Telescope, we for the first time detect motions of galaxy clusters and groups via microwave background temperature distortions due to the kinematic Sunyaev-Zel'dovich effect. Galaxy clusters are identified by their constituent luminous galaxies observed by the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey III. The mean pairwise momentum of clusters is measured at a statistical significance of 3.8 sigma, and the signal is consistent with the growth of cosmic structure in the standard model of cosmology.

Hand, Nick; Aubourg, Eric; Battaglia, Nick; Battistelli, Elia S; Bizyaev, Dmitry; Bond, J Richard; Brewington, Howard; Brinkmann, Jon; Brown, Benjamin R; Das, Sudeep; Dawson, Kyle S; Devlin, Mark J; Dunkley, Joanna; Dunner, Rolando; Eisenstein, Daniel J; Fowler, Joseph W; Gralla, Megan B; Hajian, Amir; Halpern, Mark; Hilton, Matt; Hincks, Adam D; Hlozek, Renee; Hughes, John P; Infante, Leopoldo; Irwin, Kent D; Kosowsky, Arthur; Lin, Yen-Ting; Malanushenko, Elena; Malanushenko, Viktor; Marriage, Tobias A; Marsden, Danica; Menanteau, Felipe; Moodley, Kavilan; Niemack, Michael D; Nolta, Michael R; Oravetz, Daniel; Page, Lyman A; Palanque-Delabrouille, Nathalie; Pan, Kaike; Reese, Erik D; Schlegel, David J; Schneider, Donald P; Sehgal, Neelima; Shelden, Alaina; Sievers, Jon; Sifon, Cristobal; Simmons, Audrey; Snedden, Stephanie; Spergel, David N; Staggs, Suzanne T; Swetz, Daniel S; Switzer, Eric R; Trac, Hy; Weaver, Benjamin A; Wollack, Edward J; Yeche, Christophe; Zunckel, Caroline

2012-01-01T23:59:59.000Z

147

Dynamic Response Analysis of Underground Powerhouse Structures Considering Coupling Effects of Hydraulic Impulse and Dynamic Loads  

Science Conference Proceedings (OSTI)

When accident takes place in hydropower generator units, they transit from normal working condition to accident working condition. During this period, the generator pier structures bear coupling effect of dynamic load from the units and hydraulic impulse ... Keywords: underground powerhouse structure, unit dynamic load, hydraulic impulse, coupling effect, dynamic analysis

Li Xiaoli; Yuan Chaoqing; Li Ke; Li Yujie

2012-05-01T23:59:59.000Z

148

Improving Between-Shot Fusion Data Analysis with Parallel Structures  

SciTech Connect

In the Phase I project we concentrated on three technical objectives to demonstrate the feasibility of the Phase II project: (1) the development of a parallel MDSplus data handler, (2) the parallelization of existing fusion data analysis packages, and (3) the development of techniques to automatically generate parallelized code using pre-compiler directives. We summarize the results of the Phase I research for each of these objectives below. We also describe below additional accomplishments related to the development of the TaskDL and mpiDL parallelization packages.

CHET NIETER

2005-07-27T23:59:59.000Z

149

Kinematic Self-Similar Heat Conducting and Charge Solutions  

E-Print Network (OSTI)

The objective of this paper is to study the plane symmetric kinematic self-similar heat conducting fluid and charge dust solutions of the Einstein field equations. These solutions are classified according to self-similarity of the first, second, zeroth and infinite kinds with different equations of state. We take the self-similar vector to be tilted, orthogonal and parallel to the fluid flow. For heat conducting fluid, it is found that there exist only \\emph{one} solution in parallel case. In all other possibilities, these solutions reduce to the perfect fluid kinematic self-similar solutions. For charge dust case, we also obtain only \\emph{one} kinematic self-similar solution.

M. Sharif; Wajiha Javed

2010-12-01T23:59:59.000Z

150

In vivo determination of total knee arthroplasty kinematics  

Science Conference Proceedings (OSTI)

The objective of this study was to determine if consistent posterior femoral rollback of an asymmetrical posterior cruciate retaining (PCR) total knee arthroplasty was mostly influenced by the implant design, surgical technique, or presence of a well-functioning posterior cruciate ligament (PCL). Three-dimensional femorotibial kinematics was determined for 80 subjects implanted by 3 surgeons, and each subject was evaluated under fluoroscopic surveillance during a deep knee bend. All subjects in this present study having an intact PCL had a well-functioning PCR knee and experienced normal kinematic patterns, although less in magnitude than the normal knee. In addition, a surprising finding was that, on average, subjects without a PCL still achieved posterior femoral rollback from full extension to maximum knee flexion. The findings in this study revealed that implant design did contribute to the normal kinematics demonstrated by subjects having this asymmetrical PCR total knee arthroplasty.

Komistek, Richard D [ORNL; Mahfouz, Mohamed R [ORNL; Bertin, Kim [Utah Bone & Joint Center, Salt Lake City, Utah (USA); Rosenberg, Aaron [Rush-Presbyterian-St. Luke's Med Center, Chicago IL (USA); Kennedy, William [Kennedy-White Orthopaedic Center, Sarasota, FL (USA)

2008-01-01T23:59:59.000Z

151

The kinematics of the diffuse ionized gas in NGC 4666  

E-Print Network (OSTI)

The global properties of the interstellar medium with processes such as infall and outflow of gas and a large scale circulation of matter and its consequences for star formation and chemical enrichment are important for the understanding of galaxy evolution. In this paper we studied the kinematics and morphology of the diffuse ionized gas (DIG) in the disk and in the halo of the star forming spiral galaxy NGC 4666 to derive information about its kinematical properties. Especially, we searched for infalling and outflowing ionized gas. We determined surface brightness, radial velocity, and velocity dispersion of the warm ionized gas via high spectral resolution (R ~ 9000) Fabry-P\\'erot interferometry. This allows the determination of the global velocity field and the detection of local deviations from this verlocity field. We calculated models of the DIG distribution and its kinematics for comparison with the measured data. In this way we determined fundamental parameters such as the inclination and the scale h...

Voigtländer, Pierre; Marcelin, Michel; Bomans, Dominik J; Dettmar, Ralf-Jürgen

2013-01-01T23:59:59.000Z

152

Social Recommender Systems Based on Coupling Network Structure Analysis  

E-Print Network (OSTI)

The past few years has witnessed the great success of recommender systems, which can significantly help users find relevant and interesting items for them in the information era. However, a vast class of researches in this area mainly focus on predicting missing links in bipartite user-item networks (represented as behavioral networks). Comparatively, the social impact, especially the network structure based properties, is relatively lack of study. In this paper, we firstly obtain five corresponding network-based features, including user activity, average neighbors' degree, clustering coefficient, assortative coefficient and discrimination, from social and behavioral networks, respectively. A hybrid algorithm is proposed to integrate those features from two respective networks. Subsequently, we employ a machine learning process to use those features to provide recommendation results in a binary classifier method. Experimental results on a real dataset, Flixster, suggest that the proposed method can significan...

Hu, Xiao; Chen, Xiaolong; Zhang, Zi-Ke

2012-01-01T23:59:59.000Z

153

Optical and structural analysis of lead bismuth silicate glasses  

SciTech Connect

Glasses having compositions 20PbO(79.5-x)Bi{sub 2}O{sub 3}xSiO{sub 2} (x = 10,30,50) doped with 0.5 mole% of Nd{sup 3+} ions were prepared by melt quench technique. The spectroscopic properties of the glasses were investigated using optical absorption and fluorescence spectra. The structural investigations of these glasses were carried out by recording the IR spectra. The variation of {Omega}{sub 2} with Bi{sub 2}O{sub 3} content has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in the rare earth oxygen covalency. Heavy metal oxide glasses have been used as potential candidate in solid state laser, solar concentrators, optical detector, optical fiber and fluorescent display devices.

Bhardwaj, S.; Shukla, R. [Department of physics, Deenbandhu Chhotu Ram University of Science and Technology Murthal, Sonipat, Haryana (India); Sanghi, S.; Agarwal, A.; Pal, I. [Department of Applied Physics, Guru Jambheshwar University of Science and Technology, Hisar, Haryana (India)

2011-12-12T23:59:59.000Z

154

The Analysis of Sea Surface Imagery for Whitecap Kinematics  

Science Conference Proceedings (OSTI)

Visible sea surface images are analyzed to determine the distribution of the average length of breaking crests per unit sea surface area per unit speed increment ?(c). The ?(c) distribution offers a scale-dependent description of wave breaking ...

Jessica M. Kleiss; W. Kendall Melville

2011-02-01T23:59:59.000Z

155

Geography-based structural analysis of the Internet  

SciTech Connect

In this paper, we study some geographic aspects of the Internet. We base our analysis on a large set of geolocated IP hop-level session data (including about 300,000 backbone routers, 150 million end hosts, and 1 billion sessions) that we synthesized from a variety of different input sources such as US census data, computer usage statistics, Internet market share data, IP geolocation data sets, CAJDA's Skitter data set for backbone connectivity, and BGP routing tables. We use this model to perform a nationwide and statewide geographic analysis of the Internet. Our main observations are: (1) There is a dominant coast-to-coast pattern in the US Internet traffic. In fact, in many instances even if the end-devices are not near either coast, still the traffic between them takes a long detour through the coasts. (2) More than half of the Internet paths are inflated by 100% or more compared to their corresponding geometric straight-line distance. This circuitousness makes the average ratio between the routing distance and geometric distance big (around 10). (3) The weighted mean hop count is around 5, but the hop counts are very loosely correlated with the distances. The weighted mean AS count (number of ASes traversed) is around 3. (4) The AS size and the AS location number distributions are heavy-tailed and strongly correlated. Most of the ASes are medium sized and there is a wide variability in the geographic dispersion size (measured in terms of the convex hull area) of these ASes.

Kasiviswanathan, Shiva [Los Alamos National Laboratory; Eidenbenz, Stephan [Los Alamos National Laboratory; Yan, Guanhua [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

156

KINEMATICS IN KAPTEYN'S SELECTED AREA 76: ORBITAL MOTIONS WITHIN THE HIGHLY SUBSTRUCTURED ANTICENTER STREAM  

Science Conference Proceedings (OSTI)

We have measured the mean three-dimensional kinematics of stars in Kapteyn's Selected Area (SA) 76 (l = 209.{sup 0}3, b = 26.{sup 0}4) that were selected to be Anticenter Stream (ACS) members on the basis of their radial velocities (RVs), proper motions (PMs), and location in the color-magnitude diagram. From a total of 31 stars ascertained to be ACS members primarily from its main-sequence turnoff, a mean ACS RV (derived from spectra obtained with the Hydra multi-object spectrograph on the WIYN 3.5 m telescope) of V{sub helio} = 97.0 {+-} 2.8 km s{sup -1} was determined, with an intrinsic velocity dispersion {sigma}{sub o} = 12.8 {+-} 2.1 km s{sup -1}. The mean absolute PMs of these 31 ACS members are {mu}{sub {alpha}} cos {delta} = -1.20 {+-} 0.34 mas yr{sup -1} and {mu}{sub {delta}} = -0.78 {+-} 0.36 mas yr{sup -1}. At a distance to the ACS of 10 {+-} 3 kpc, these measured kinematical quantities produce an orbit that deviates by {approx}30{sup 0} from the well-defined swath of stellar overdensity constituting the ACS in the western portion of the Sloan Digital Sky Survey footprint. We explore possible explanations for this and suggest that our data in SA 76 are measuring the motion of a kinematically cold sub-stream among the ACS debris that was likely a fragment of the same infalling structure that created the larger ACS system. The ACS is clearly separated spatially from the majority of claimed Monoceros ring detections in this region of the sky; however, with the data in hand, we are unable to either confirm or rule out an association between the ACS and the poorly understood Monoceros structure.

Carlin, Jeffrey L.; Majewski, Steven R. [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 (United States); Casetti-Dinescu, Dana I.; Girard, Terrence M. [Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States); Grillmair, Carl J., E-mail: jc4qn@mail.astro.virginia.ed, E-mail: srm4n@virginia.ed, E-mail: dana@astro.yale.ed, E-mail: girard@astro.yale.ed, E-mail: carl@ipac.caltech.ed [Spitzer Science Center, 1200 E. California Blvd., Pasadena, CA 91125 (United States)

2010-12-20T23:59:59.000Z

157

Finite element strategies for the efficient analysis and evaluation of solar collector structures  

DOE Green Energy (OSTI)

Concentrating or reflecting structures for solar energy systems must be evaluated as to their structural integrity and optical performance. Computer studies can be used as an integral part of these evaluations. The computer studies make use of finite element structural codes coupled with post-processors that calculate optical data. If the analysis of a solar structure is to be carried out in an efficient manner, these computer codes must have certain capabilities. A number of solar energy projects at Sandia National Laboratories have made extensive use of finite element analyses. The analyses have been useful in evaluating design concepts which hold promise for large scale use in solar energy projects. Analysis procedures have been developed for some structures so that evaluations can be carried out in a straightforward manner.

Koteras, J. R.

1980-01-01T23:59:59.000Z

158

Structure Function Analysis of Long Term Quasar Variability  

E-Print Network (OSTI)

In our second paper on long-term quasar variability, we employ a much larger database of quasars than in de Vries, Becker & White. This expanded sample, containing 35165 quasars from the Sloan Digital Sky Survey Data Release 2, and 6413 additional quasars in the same area of the sky taken from the 2dF QSO Redshift Survey, allows us to significantly improve on our earlier conclusions. As before, all the historic quasar photometry has been calibrated onto the SDSS scale by using large numbers of calibration stars around each quasar position. We find the following: (1) the outbursts have an asymmetric light-curve profile, with a fast-rise, slow-decline shape; this argues against a scenario in which micro-lensing events along the line-of-sight to the quasars are dominating the long-term variations in quasars; (2) there is no turnover in the Structure Function of the quasars up to time-scales of ~40 years, and the increase in variability with increasing time-lags is monotonic and constant; and consequently, (3) there is not a single preferred characteristic outburst time-scale for the quasars, but most likely a continuum of outburst time-scales, (4) the magnitude of the quasar variability is a function of wavelength: variability increases toward the blue part of the spectrum, (5) high-luminosity quasars vary less than low-luminosity quasars, consistent with a scenario in which variations have limited absolute magnitude. Based on this, we conclude that quasar variability is intrinsic to the Active Galactic Nucleus, is caused by chromatic outbursts / flares with a limited luminosity range and varying time-scales, and which have an overall asymmetric light-curve shape. Currently the model that has the most promise of fitting the observations is based on accretion disk instabilities.

W. H. de Vries; R. H. Becker; R. L. White; C. Loomis

2004-11-12T23:59:59.000Z

159

Mitigating kinematic locking in the material point method  

Science Conference Proceedings (OSTI)

The material point method exhibits kinematic locking when traditional linear shape functions are used with a rectangular grid. The locking affects both the strain and the stress fields, which can lead to inaccurate results and nonphysical behavior. This ... Keywords: Locking, Material point method, Meshfree methods, Particle methods

C. M. Mast; P. Mackenzie-Helnwein; P. Arduino; G. R. Miller; W. Shin

2012-06-01T23:59:59.000Z

160

Transport and Mixing in Kinematic and Dynamically Consistent Flows  

Science Conference Proceedings (OSTI)

The interplay between dynamics and transport in two-dimensional flows is examined by comparing the transport and mixing in a kinematic flow in which the velocity field is imposed as a given function of time with that in an analogous dynamically ...

P. H. Haynes; D. A. Poet; E. F. Shuckburgh

2007-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

OVERVIEW ON BNL ASSESSMENT OF SEISMIC ANALYSIS METHODS FOR DEEPLY EMBEDDED NPP STRUCTURES.  

Science Conference Proceedings (OSTI)

A study was performed by Brookhaven National Laboratory (BNL) under the sponsorship of the U. S. Nuclear Regulatory Commission (USNRC), to determine the applicability of established soil-structure interaction analysis methods and computer programs to deeply embedded and/or buried (DEB) nuclear power plant (NPP) structures. This paper provides an overview of the BNL study including a description and discussions of analyses performed to assess relative performance of various SSI analysis methods typically applied to NPP structures, as well as the importance of interface modeling for DEB structures. There are four main elements contained in the BNL study: (1) Review and evaluation of existing seismic design practice, (2) Assessment of simplified vs. detailed methods for SSI in-structure response spectrum analysis of DEB structures, (3) Assessment of methods for computing seismic induced earth pressures on DEB structures, and (4) Development of the criteria for benchmark problems which could be used for validating computer programs for computing seismic responses of DEB NPP structures. The BNL study concluded that the equivalent linear SSI methods, including both simplified and detailed approaches, can be extended to DEB structures and produce acceptable SSI response calculations, provided that the SSI response induced by the ground motion is very much within the linear regime or the non-linear effect is not anticipated to control the SSI response parameters. The BNL study also revealed that the response calculation is sensitive to the modeling assumptions made for the soil/structure interface and application of a particular material model for the soil.

XU,J.; COSTANTINO, C.; HOFMAYER, C.; GRAVES, H.

2007-04-01T23:59:59.000Z

162

Tensor analysis of spatial mechanisms  

Science Conference Proceedings (OSTI)

The position analysis of a general four-bar spatial mechanism is developed using tensor notation and operations. To exemplify the convenience of tensors in kinematic analysis the solution is obtained for a mechanism containing two revolute pairs of links ...

C. Y. Ho

1966-05-01T23:59:59.000Z

163

Lipid Analysis and Lipidomics: New Techniques & Application-Ch 6Structural Analysis of Unsaturated Fatty Acid Methyl Ester Isomers with Acetonitrile Covalent Adduct Chemical Ionization  

Science Conference Proceedings (OSTI)

Lipid Analysis and Lipidomics: New Techniques & Application-Ch 6 Structural Analysis of Unsaturated Fatty Acid Methyl Ester Isomers with Acetonitrile Covalent Adduct Chemical Ionization Methods and Analyses eChapters Methods - Analyses Book

164

Lipid Analysis and Lipidomics: New Techniques & ApplicationChapter 18 Phospholipids: Structures and Physicochemical Activities  

Science Conference Proceedings (OSTI)

Lipid Analysis and Lipidomics: New Techniques & Application Chapter 18 Phospholipids: Structures and Physicochemical Activities Methods and Analyses eChapters Methods - Analyses Books 7F901335BDC265F6CD236F34E0A1D72F AOCS Press ...

165

High dimensional model representation based formulations for fuzzy finite element analysis of structures  

Science Conference Proceedings (OSTI)

This paper presents a practical approach based on high dimensional model representation (HDMR) for analyzing the response of structures with fuzzy parameters. The proposed methodology involves integrated finite element modeling, HDMR based response surface ... Keywords: Explicit formulation, Finite element, Fuzzy analysis, High dimensional model representation, Implicit formulation, Response surface

A. S. Balu; B. N. Rao

2012-03-01T23:59:59.000Z

166

Spatial stochastic direct and inverse analysis for the extent of damage in deteriorated RC structures  

Science Conference Proceedings (OSTI)

The problem of updating the parameters of a probabilistic model, describing spatially large structures, based on uncertain output information is analyzed. An unscented Kalman filter (UKF) variant is successfully used, although the analysis has not been ... Keywords: Model updating, Parameter estimation, Probabilistic homogenization, Spatial corrosion deterioration, Stochastic optimization, Unscented Kalman filter variant

K. G. Papakonstantinou, M. Shinozuka

2013-11-01T23:59:59.000Z

167

Multivariate analysis of structural economic indicators for Croatia and EU 27  

Science Conference Proceedings (OSTI)

The last (5th) wave of EU enlargement ended on 1st January 2007 with the accession of Romania and Bulgaria. Many countries of the South-Eastern Europe aspire to join the EU. Croatia appears to be the next prospective member, so the aim of this paper ... Keywords: Ward's method, classification, cluster analysis, k-means method, multivariate method, structural economic indicators

Natasa Kurnoga Zivadinovic; Ksenija Dumicic; Anita Ceh Casni

2009-05-01T23:59:59.000Z

168

Structural analysis of an LMFBR shield assembly duct under thermo-mechanical and seismic loads  

SciTech Connect

This paper describes the stress analysis performed to assess structural adequacy of the Clinch River Breeder Reactor (CRBR) core removable shield assemblies. Removable shield assemblies are located in the peripheral region of the core (between blanket assemblies and the fixed radial shield), and are subjected to severe cross-sectional thermal gradients and seismic loads requiring a relatively complex duct load pad design. For cost-effectiveness, the analysis was conducted in two stages. First, an elasto-plastic seismic stress analysis was performed using a detailed nonlinear finite element model (with gaps) of the load pad configuration. Next, in order to determine the total strain accumulation and the creep-fatigue damage the maximum seismic stresses combined with the ''worst'' thermal stresses from a single assembly model were used to perform a simplified inelastic analysis using two sets of material properties to bound the changing material conditions during reactor operation. This work demonstrated the necessity and applicability of the two simplified analysis techniques in elevated temperature structural design, i.e., the treatment of time-dependent degradation of material properties due to temperature and nuclear irradiation, and the use of time-independent finite element stress analysis results to perform a simplified creep-fatigue analysis.

Malik, S.N.; Sazawal, V.K.

1984-06-01T23:59:59.000Z

169

High-speed camera characterization of voluntary eye blinking kinematics  

E-Print Network (OSTI)

1 High-Speed Camera Characterisation of Voluntary Eye Blinking Kinematics Kyung-Ah Kwon, Rebecca J. Shipley, Mohan Edirisinghe* Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK Daniel... , M. G. 1980 Interaction of eyelids and tears in corneal wetting and the dynamics of the normal human eyeblink. Am J Ophthalmol. 89:507-516. 4. Bologna, M., Agostino, R., Gregori, B., Belvisi, D., Ottaviani, D., Colosimo, C., Fabbrini, G...

Kwon, K-A; Shipley, RJ; Edirisinghe, M; Ezra, DG; Rose, G; Best, Serena Michelle; Cameron, Ruth Elizabeth

2013-01-01T23:59:59.000Z

170

If houses could talk| A comparative analysis of Elymian houses in northwestern Sicily with vernacular structures of Greece and Anatolia.  

E-Print Network (OSTI)

?? This research is an architectural comparative analysis between Elymian houses in northwestern Sicily and vernacular structures from Anatolia and Greece in order to demonstrate… (more)

Genova, Amy Michelle

2009-01-01T23:59:59.000Z

171

Variance Analysis of Wind and Natural Gas Generation under Different Market Structures: Some Observations  

NLE Websites -- All DOE Office Websites (Extended Search)

Variance Analysis of Wind and Variance Analysis of Wind and Natural Gas Generation under Different Market Structures: Some Observations Brian Bush, Thomas Jenkin, David Lipowicz, and Douglas J. Arent National Renewable Energy Laboratory Roger Cooke Resources for the Future Technical Report NREL/TP-6A20-52790 January 2012 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401 303-275-3000 * www.nrel.gov Contract No. DE-AC36-08GO28308 Variance Analysis of Wind and Natural Gas Generation under Different Market Structures: Some Observations Brian Bush, Thomas Jenkin, David Lipowicz,

172

Structural analysis of the equipment removal system for tank 241SY101  

DOE Green Energy (OSTI)

The calculations documented in this report show that the ERS major components are structurally qualified to complete the objective, i.e., to install the removed equipment into a shipping container and transport and store the container at the Central Waste Complex (CWC). The analysis for the structural members of the ERS components considers live load with an impact factor of 125 % added to dead load. An allowable stress of one-third yield is used for all structural components carrying the load based on DOE-RL-92-36. Adherence to DOE-RL-92-36 is not a code requirement. However, the loads considered make this factor of safety appropriate. The calculations meet the strength requirements of the American Institute for Steel Construction (ASIC 1989) for all non-critical structural elements.

Mackey, T.C.

1995-03-02T23:59:59.000Z

173

Role of radiation damping in the impedance function approach to soil-structure interaction analysis  

SciTech Connect

This report was prepared at the request of the Lawrence Livermore Laboratory (LLL) to provide background information for analyzing soil-structure interaction by the frequency-independent impedance function approach. LLL is conducting such analyses as part of its seismic review of selected operating plants under the Systematic Evaluation Program for the US Nuclear Regulatory Commission. The analytical background and basic assumptionsof the impedance function theory are briefly reviewed, and the role of radiation damping in soil-structure interaction analysis is discussed. The validity of modeling soil-structure interaction by using frequency-independent functions is evaluated based on data from several field tests. Finally, the recommended procedures for performing soil-structure interaction analyses are discussed with emphasis on the modal superposition method.

Not Available

1980-05-01T23:59:59.000Z

174

Coupled electromagnetic structural analysis of a dc magnet for a MHD power generator  

DOE Green Energy (OSTI)

A coupled electromagnetic and nonlinear structural analysis of a 4.5 tesla superconducting MHD dipole magnet is presented. The magnet design combines the latest in cable-in-conduit conductor (CICC) technology, a novel quasi-momentless support configuration, and finite element modeling to demonstrate the viability of this retrofit magnet concept. With the conductor participating as a major structural element, the support system is greatly simplified, and the overall cost and risk of the magnet system is reduced. Two and three-dimensional models are used to evaluate the concept and demonstrate how the full simulation is accomplished in one ANSYS computer run.

Myatt, R.L.; Martin, P.G. [Massachusetts Inst. of Technology, Cambridge, MA (United States). Plasma Fusion Center] [Massachusetts Inst. of Technology, Cambridge, MA (United States). Plasma Fusion Center

1994-09-01T23:59:59.000Z

175

Constructing a Temporal Relation Tagged Corpus of Chinese based on Dependency Structure Analysis  

E-Print Network (OSTI)

This paper describes an annotation guideline for a temporal relation-tagged corpus of Chinese. Our goal is construction of corpora to be used for a corpus-based analysis of temporal relations among events. Since annotating all combinations of events is inefficient, we examine the use of dependency structure to efficiently recognize temporal relations. We annotate a part of Treebank based on our guidelines. Then, we survey a small tagged data set to investigate the coverage of our method. While we find that use of dependency structure drastically reduces manual effort in constructing a tagged corpus with temporal relations, the coverage of the methods achieves about 63%.

Yuchang Cheng; Masayuki Asahara; Yuji Matsumoto

2007-01-01T23:59:59.000Z

176

Next-to leading order analysis of target mass corrections to structure functions and asymmetries  

SciTech Connect

We perform a comprehensive analysis of target mass corrections (TMCs) to spin-averaged structure functions and asymmetries at next-to-leading order. Several different prescriptions for TMCs are considered, including the operator product expansion, and various approximations to it, collinear factorization, and xi-scaling. We assess the impact of each of these on a number of observables, such as the neutron to proton F{sub 2} structure function ratio, and parity-violating electron scattering asymmetries for protons and deuterons which are sensitive to gamma-Z interference effects. The corrections from higher order radiative and nuclear effects on the parity-violating deuteron asymmetry are also quantified.

L. T. Brady, A. Accardi, T. J. Hobbs, W. Melnitchouk

2011-10-01T23:59:59.000Z

177

A hybrid-mixed finite element formulation for the geometrically exact analysis of three-dimensional framed structures  

Science Conference Proceedings (OSTI)

This paper addresses the development of a hybrid-mixed finite element formulation for the quasi-static geometrically exact analysis of three-dimensional framed structures with linear elastic behavior. The formulation is based on a modified principle ... Keywords: Complementary energy principle, Geometrically exact analysis, Hybrid-mixed finite elements, One-dimensional beam model, Three-dimensional framed structures

H. A. Santos; P. M. Pimenta; J. P. Almeida

2011-11-01T23:59:59.000Z

178

Development of a structure analysis algorithm on structures from CuCl2·2H2O crystallization with agricultural products  

Science Conference Proceedings (OSTI)

Crystallization patterns emerge when an aqueous dihydrate Copper chloride (CuCl"2@?2H"2O) solution in the presence of organic additives (juices/extracts) is crystallized on a glass plate. The emerging patterns are additive-specific and reflect physiological ... Keywords: Crystallization, Dihydrate Copper chloride, Food quality, GLCM, Physiological processes, ROI, Structure analysis, Texture analysis

Paul Doesburg; Andreas F. M. Nierop

2013-01-01T23:59:59.000Z

179

STELLAR KINEMATICS OF THE ANDROMEDA II DWARF SPHEROIDAL GALAXY  

Science Conference Proceedings (OSTI)

We present kinematical profiles and metallicity for the M31 dwarf spheroidal (dSph) satellite galaxy Andromeda II (And II) based on Keck DEIMOS spectroscopy of 531 red giant branch stars. Our kinematical sample is among the largest for any M31 satellite and extends out to two effective radii (r {sub eff} = 5.'3 = 1.1 kpc). We find a mean systemic velocity of -192.4 {+-} 0.5 km s{sup -1} and an average velocity dispersion of {sigma} {sub v} = 7.8 {+-} 1.1 km s{sup -1}. While the rotation velocity along the major axis of And II is nearly zero (<1 km s{sup -1}), the rotation along the minor axis is significant with a maximum rotational velocity of v {sub max} = 8.6 {+-} 1.8 km s{sup -1}. We find a kinematical major axis, with a maximum rotational velocity of v {sub max} = 10.9 {+-} 2.4 km s{sup -1}, misaligned by 67 Degree-Sign to the isophotal major axis. And II is thus the first dwarf galaxy with evidence for nearly prolate rotation with a v {sub max}/{sigma} {sub v} = 1.1, although given its ellipticity of {epsilon} = 0.10, this object may be triaxial. We measured metallicities for a subsample of our data, finding a mean metallicity of [Fe/H] = -1.39 {+-} 0.03 dex and an internal metallicity dispersion of 0.72 {+-} 0.03 dex. We find a radial metallicity gradient with metal-rich stars more centrally concentrated, but do not observe a significant difference in the dynamics of the two metallicity populations. And II is the only known dwarf galaxy to show minor axis rotation, making it a unique system whose existence offers important clues on the processes responsible for the formation of dSphs.

Ho, Nhung; Geha, M.; Tollerud, E. [Astronomy Department, Yale University, New Haven, CT 06520 (United States); Munoz, R. R. [Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile); Guhathakurta, P. [UCO/Lick Observatory, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 (United States); Kalirai, J. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Gilbert, K. M. [Department of Astronomy, University of Washington, Seattle, WA 98195 (United States); Bullock, J. [Center for Cosmology, Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States); Beaton, R. L.; Majewski, S. R., E-mail: ngocnhung.ho@yale.edu, E-mail: marla.geha@yale.edu [Department of Astronomy, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903 (United States)

2012-10-20T23:59:59.000Z

180

KINEMATIC ORIGIN OF CORRELATIONS BETWEEN GAMMA-RAY BURST OBSERVABLES  

Science Conference Proceedings (OSTI)

Recently, several new correlations between gamma-ray burst (GRB) observables have been discovered. Like previously well-established correlations, they challenge GRB models. Here, we show that in the cannonball (CB) model of GRBs, the newly discovered correlations have the same simple kinematic origin as those discovered earlier. They all result from the strong dependence of the observed radiations on the Lorentz and Doppler factors of the jet of highly relativistic plasmoids (CBs) that produces the observed radiations by interaction with the medium through which it propagates.

Dado, Shlomo; Dar, Arnon, E-mail: dado@phep3.technion.ac.il, E-mail: arnon@physics.technion.ac.il [Physics Department, Technion, Haifa 32000 (Israel)

2012-04-20T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Structural analysis of arabinoxylans isolated from ball-milled switchgrass biomass  

NLE Websites -- All DOE Office Websites (Extended Search)

analysis analysis of arabinoxylans isolated from ball-milled switchgrass biomass Koushik Mazumder, William S. York * Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, USA a r t i c l e i n f o Article history: Received 16 June 2010 Received in revised form 20 July 2010 Accepted 22 July 2010 Available online 30 July 2010 Keywords: Switchgrass Enzymatic digestion Arabinoxylan oligosaccharides Per-O-methylation Multiple-step mass spectrometry Structural analysis a b s t r a c t Ball-milled alcohol-insoluble residue (AIR) was prepared from switchgrass (Panicum virgatum var Alamo) and sequentially extracted with 50 mM ammonium oxalate buffer, 50 mM sodium carbonate, 1 M KOH containing 1% NaBH 4 , and 4 M KOH containing 1% NaBH 4 . Arabinoxylan was the most abundant component of the 1 M KOH-extracted fraction, which was treated with endoxylanase

182

Three-dimensional kinematics of the lower limbs during forward hockey skating.  

E-Print Network (OSTI)

??Objectives. The purpose of this study was too determine whether there were significant kinematic differences between recreational and elite hockey players and between contra-lateral lower… (more)

Upjohn, Tegan

2005-01-01T23:59:59.000Z

183

A DETAILED MORPHO-KINEMATIC MODEL OF THE ESKIMO, NGC 2392: A UNIFYING VIEW WITH THE CAT'S EYE AND SATURN PLANETARY NEBULAE  

Science Conference Proceedings (OSTI)

The three-dimensional and kinematic structure of the Eskimo nebula, NGC 2392, has been notoriously difficult to interpret in detail given its complex morphology, multiple kinematic components and its nearly pole-on orientation along the line of sight. We present a comprehensive, spatially resolved, high-resolution, long-slit spectroscopic mapping of the Eskimo planetary nebula. The data consist of 21 spatially resolved, long-slit echelle spectra tightly spaced over the Eskimo and along its bipolar jets. This data set allows us to construct a velocity-resolved [N II] channel map of the nebula with a resolution of 10 km s{sup -1} that disentangles its different kinematic components. The spectroscopic information is combined with Hubble Space Telescope images to construct a detailed three-dimensional morpho-kinematic model of the Eskimo using the code SHAPE. With this model we demonstrate that the Eskimo is a close analog to the Saturn and the Cat's Eye nebulae, but rotated 90 Degree-Sign to the line of sight. Furthermore, we show that the main characteristics of our model apply to the general properties of the group of elliptical planetary nebulae with ansae or FLIERS, once the orientation is considered. We conclude that this kind of nebula belongs to a class with a complex common evolutionary sequence of events.

Garcia-Diaz, Ma. T.; Lopez, J. A.; Steffen, W.; Richer, M. G., E-mail: tere@astrosen.unam.mx, E-mail: jal@astrosen.unam.mx, E-mail: wsteffen@astrosen.unam.mx, E-mail: richer@astrosen.unam.mx [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Campus Ensenada, Ensenada, Baja California, 22800 (Mexico)

2012-12-20T23:59:59.000Z

184

Development of a reliability-analysis method for category I structures. [PWR; BWR  

DOE Green Energy (OSTI)

The present paper develops a reliability analysis method for category I nuclear structures, particularly for reinforced concrete containment structures subjected to various load combinations. The loads considered here include dead loads, accidental internal pressure and earthquake ground acceleration. For mathematical tractability, an earthquake occurrence is assumed to be governed by the Poisson arrival law, while its acceleration history is idealized as a Gaussian vector process of finite duration. A vector process consists of three component processes, each with zero mean. The second order statistics of this process are specified by a three-by-three spectral density matrix with a multiplying factor representing the overall intensity of the ground acceleration. With respect to accidental internal pressure, the following assumptions are made: (a) it occurs in accordance with the Poisson law; (b) its intensity and duration are random; and (c) its temporal rise and fall behaviors are such that a quasi-static structural analysis applies. A dead load is considered to be a deterministic constant.

Shinozuka, M.; Kako, T.; Hwang, H.; Reich, M.

1983-01-01T23:59:59.000Z

185

The measurement and analysis of wavefront structure from large aperture ICF optics  

Science Conference Proceedings (OSTI)

This paper discusses the techniques, developed over the past year, for high spatial resolution measurement and analysis of the transmitted and/or reflected wavefront of large aperture ICF optical components. Parts up to 400 mm {times} 750 mm have been measured and include: laser slabs, windows, KDP crystals and lenses. The measurements were performed using state-of-the-art commercial phase shifting interferometers at a wavelength of 633 {mu}m. Both 1 and 2-D Fourier analysis have been used to characterize the wavefront; specifically the Power Spectral Density, (PSD), function was calculated. The PSDs of several precision optical components will be shown. The PSD(V) is proportional to the (amplitude){sup 2} of components of the Fourier frequency spectrum. The PSD describes the scattered intensity and direction as a function of scattering angle in the wavefront. The capability of commercial software is limited to 1-D Fourier analysis only. We are developing our own 2-D analysis capability in support of work to revise specifications for NIF optics. 2-D analysis uses the entire wavefront phase map to construct 2D PSD functions. We have been able to increase the signal-to-noise relative to 1-D and can observe very subtle wavefront structure.

Wolfe, C.R.; Lawson, J.K.

1995-05-30T23:59:59.000Z

186

Real-Time and Post-Reaction Microscopic Structural Analysis of Biomass Undergoing Pyrolysis  

Science Conference Proceedings (OSTI)

The structural complexity of unprocessed plant tissues used for thermochemical conversion of biomass to fuels and energy impedes heat and mass transfer and may increase the occurrence of tar-forming secondary chemical reactions. At industrial scales, gas and liquid products trapped within large biomass particles may reduce net fuel yields and increase tars, impacting industrial operations and increasing overall costs. Real-time microscopic analysis of poplar (Populus sp.) wood samples undergoing anoxic, pyrolytic heat treatment has revealed a pattern of tissue and macropore expansion and collapse. Post-reaction structural analyses of biomass char (biochar) by light and transmission electron microscopy have provided direct structural evidence of pyrolysis product mass-transfer issues, including trapped pyrolysis products and cell wall compression, and have demonstrated the impact of heat-transfer problems on biomass particles. Finally, microscopic imaging has revealed that pyrolyzed/gasified biochars recovered from a fluidized bed reactor retain a similar pre-reaction basic plant tissue structure as the samples used in this study, suggesting that the phenomena observed here are representative of those that occur in larger scale reactors.

Haas, T. J.; Nimlos, M. R.; Donohoe, B. S.

2009-01-01T23:59:59.000Z

187

Induced structural radioactivity inventory analysis of the base case aqueous ATW reactor concept  

Science Conference Proceedings (OSTI)

The purpose of the Los Alamos National Laboratory Accelerator Transmutation of Nuclear Waste (ATW) project is the substantial reduction in volume of this country`s long-lived high-level radioactive waste in a safe and energy efficient manner. An evaluation of the Accelerator Transmutation of Nuclear Waste concept has four aspects; material balance, energy balance, performance and cost. An evaluation of the material balance compares the amount of long-lived high-level waste transmuted with the amount and type of waste created in the process. One component of the material balance is the activation of structural materials over the lifetime of the transmutation reactor. An activation analysis has been performed on four structure regions of the reaction vessel: the tungsten target; the lead target and annulus; the Zircalloy and aluminum tubing carrying the actinide slurry and; the stainless steel tank.

Bezdecny, J.A.; Henderson, D.L. [Wisconsin Univ., Madison, WI (United States); Sailor, W.C. [Los Alamos National Lab., NM (United States)

1993-12-31T23:59:59.000Z

188

Structure-based methods for the phylogenetic analysis of ribosomal RNA molecules  

E-Print Network (OSTI)

Ribosomal RNA (rRNA) molecules form highly conserved secondary and tertiary structures via rRNA-rRNA and rRNA-protein interactions that collectively comprise the macromolecule that is the ribosome. Because of their cellular universality, rRNA molecules are commonly used for phylogeny estimations spanning all divergences of life. In this dissertation, I elucidate the structure of several rRNAs by analyzing multiply aligned sequences for basepair covariation and conserved higher order structural motifs. Specifically, I predict novel structures for expansion segments D2 and D3 of the nuclear large subunit rRNA (28S) and variable regions V4-V9 of the nuclear small subunit rRNA (18S) from from 249 galerucine leaf beetles (Coleoptera: Chrysomelidae). I describe a novel means for characterizing regions of alignment ambiguity that improves methods for retaining phylogenetic information without violating nucleotide positional homology. In the program PHASE, I explore a variety of RNA maximum likelihood models using the 28S rRNA dataset and discuss the utitilty of these models in light of their performance under Bayesian analysis. I conclude that seven-state models are likely the best models to use for phylogenetic estimation, although I cannot determine with confidence which of the two seven-state models (7A or 7D) is better. Evaluation of the unpaired sites within both rRNAs in Modeltest provided a similar model of evolution for these non-pairing regions (TrN+ I+G). In addition, a sequenced region of the mitochondrial cytochrome oxidase I gene (COI) from the galerucines was evaluated in Modeltest, with each codon position modeled separately (GTR+I+G for positions 1 and 2, GTR+G for position 3). The combined galerucine dataset (28S+18S rRNA helices, 28S+18S rRNA unpaired sites, COI 1st, 2nd and 3rd positions) provided for two mixedmodel Bayesian analysis of five discretely-modeled partitions (using 7A and 7D). The results of these analyses are compared with those obtained from equally weighted parsimony to provide a robust phylogenetic estimate of the Galerucinae and related leaf beetle taxa. Finally, the odd characteristics of strepsipteran 18S rRNA are evaluated through comparison of 12 strepsipterans with 163 structurally-aligned arthropod sequences. Among other interesting results, I identify errors in previously published strepsipteran sequences and predict structures not previously known from metazoan rRNA.

Gillespie, Joseph James

2005-08-01T23:59:59.000Z

189

Autonomous Path Tracking of a Kinematic Airship in Presence of Unknown Gust  

Science Conference Proceedings (OSTI)

The trajectory tracking problem of autonomous lighter than air vehicles in the presence of wind gusts is studied in this paper. The airship is represented as one point which is its center of volume, and only the kinematic equations are considered for ... Keywords: Airship, Gusts, Kinematic model, Lyapunov approach, Trajectory tracking

Elie Kahale; Pedro Castillo Garcia; Yasmina Bestaoui

2013-01-01T23:59:59.000Z

190

Graph visualization for the analysis of the structure and dynamics of extreme-scale supercomputers  

Science Conference Proceedings (OSTI)

We are exploring the development and application of information visualization techniques for the analysis of new extreme-scale supercomputer architectures. Modern supercomputers typically comprise very large clusters of commodity SMPs interconnected by possibly dense and often nonstandard networks. The scale, complexity, and inherent nonlocality of the structure and dynamics of this hardware, and the systems and applications distributed over it, challenge traditional analysis methods. As part of the a la carte team at Los Alamos National Laboratory, who are simulating these advanced architectures, we are exploring advanced visualization techniques and creating tools to provide intuitive exploration, discovery, and analysis of these simulations. This work complements existing and emerging algorithmic analysis tools. Here we gives background on the problem domain, a description of a prototypical computer architecture of interest (on the order of 10,000 processors connected by a quaternary fat-tree network), and presentations of several visualizations of the simulation data that make clear the flow of data in the interconnection network.

Berkbigler, K. P. (Kathryn P.); Bush, B. W. (Brian W.); Davis, Kei,; Hoisie, A. (Adolfy); Smith, S. A. (Steve A.)

2002-01-01T23:59:59.000Z

191

Memory Efficient Sequence Analysis Using Compressed Data Structures (Metagenomics Informatics Challenges Workshop: 10K Genomes at a Time)  

Science Conference Proceedings (OSTI)

Wellcome Trust Sanger Institute's Jared Simpson on "Memory efficient sequence analysis using compressed data structures" at the Metagenomics Informatics Challenges Workshop held at the DOE JGI on October 12-13, 2011

Simpson, Jared [Wellcome Trust Sanger Institute

2011-10-13T23:59:59.000Z

192

KINEMATIC SPACES AND DE VRIES ALGEBRAS: TOWARDS POSSIBLE PHYSICAL MEANING OF DE VRIES ALGEBRAS  

E-Print Network (OSTI)

Traditionally, in physics, spacetimes are described by (pseudo)Riemann spaces, i.e., by smooth manifolds with a tensor metric field. However, in several physically interesting situations smoothness is violated: near the Big Bang, at the black holes, and on the microlevel, when we take into account quantum effects. In all these situations, what remains is causality — an ordering relation. To describe such situations, in the 1960s, geometers H. Busemann and R. Pimenov and physicists E. Kronheimer and R. Penrose developed a theory of kinematic spaces. Originally, kinematic spaces were formulated as topological ordered spaces, but it turned out that kinematic spaces allow an equivalent purely algebraic description as sets with two related orders: causality and “kinematic ” causality (possibility to influence by particles with nonzero mass, particles that travel with speed smaller than the speed of light). In this paper, we analyze the relation between kinematic spaces and de Vries algebras – another mathematical object with two similarly related orders.

O. Kosheleva; F. Zapata

2012-01-01T23:59:59.000Z

193

Kinematics of Top Quark Final States: A Snowmass White Paper  

E-Print Network (OSTI)

This is the summary report of the Top Quark Kinematics working group prepared for Snowmass 2013. We survey the current state of theoretical predictions for top pair differential distributions, in both boosted and un-boosted regimes, and present an overview of uncertainties and prospects for top spin correlations. We study the prospects for measuring the inclusive SM top pair production asymmetry AFC at LHC 14 as a function of systematic error, and show that some improvement over current systematic uncertainties, as customarily handled, is required for observing a SM-size asymmetry. Cuts on top pair invariant mass and rapidity do not substantially alter this conclusion. We summarize the conclusions of contributed studies on alternate LHC measurements of the ttbar production asymmetry, in ttbar+jet final states and in forward top production at LHCb, both of which show good prospects for observing SM-size asymmetries in 50 fb-1 of data at LHC14.

Andreas Jung; Markus Schulze; Jessie Shelton

2013-09-11T23:59:59.000Z

194

Self-heating in kinematically complex magnetohydrodynamic flows  

SciTech Connect

The non-modal self-heating mechanism driven by the velocity shear in kinematically complex magnetohydrodynamic (MHD) plasma flows is considered. The study is based on the full set of MHD equations including dissipative terms. The equations are linearized and unstable modes in the flow are looked for. Two different cases are specified and studied: (a) the instability related to an exponential evolution of the wave vector and (b) the parametric instability, which takes place when the components of the wave vector evolve in time periodically. By examining the dissipative terms, it is shown that the self-heating rate provided by viscous damping is of the same order of magnitude as that due to the magnetic resistivity. It is found that the heating efficiency of the exponential instability is higher than that of the parametric instability.

Osmanov, Zaza; Rogava, Andria [Centre for Theoretical Astrophysics, ITP, Ilia State University, 0162-Tbilisi (Georgia); Poedts, Stefaan [Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, Bus 2400 B-3001 (Belgium)

2012-01-15T23:59:59.000Z

195

Real time markerless motion tracking using linked kinematic chains  

DOE Patents (OSTI)

A markerless method is described for tracking the motion of subjects in a three dimensional environment using a model based on linked kinematic chains. The invention is suitable for tracking robotic, animal or human subjects in real-time using a single computer with inexpensive video equipment, and does not require the use of markers or specialized clothing. A simple model of rigid linked segments is constructed of the subject and tracked using three dimensional volumetric data collected by a multiple camera video imaging system. A physics based method is then used to compute forces to align the model with subsequent volumetric data sets in real-time. The method is able to handle occlusion of segments and accommodates joint limits, velocity constraints, and collision constraints and provides for error recovery. The method further provides for elimination of singularities in Jacobian based calculations, which has been problematic in alternative methods.

Luck, Jason P. (Arvada, CO); Small, Daniel E. (Albuquerque, NM)

2007-08-14T23:59:59.000Z

196

On the Incidence and Kinematics of Strong Mg II Absorbers  

E-Print Network (OSTI)

We present the results of two investigations into the nature of strong (rest equivalent width > 1.0 Ang) Mg II absorption systems at high redshift. The first line of questioning examines the complete SDSS- DR3 set of quasar spectra to determine the evolution of the incidence of strong Mg II absorption. The redshift evolution of the comoving line-of-sight number density, l(x), is characterized by a roughly constant value at z > 0.8, indicating that the product of the number density and gas cross-section of halos hosting strong Mg II is unevolving at these redshifts. At z gas cross-section to strong Mg II absorption and therefore a decline in the physical processes relevant to such absorption. This evolution roughly tracks the global evolution of the SFR density. The decrease of l(x) is more pronounced for larger equivalent width systems. We also present the results of a search for strong Mg II absorption in 91 high resolution quasar spectra, which allow us to investigate the kinematics of such systems. These systems are characterized by the presence of numerous components spread over a ~200 km/s velocity width and the presence of more highly ionized species, which display kinematic profiles similar to the corresponding Mg II absorption. We consider these results in light of two competing theories to explain strong Mg II absorption: post-starburst, SN-driven galactic winds and accreting gas in the halos of massive galaxies. The later model is disfavored by the absence of evolution in l(x) at z > 1. We argue that the strong Mg II phenomenon primarily arises from feedback processes in relatively low mass galactic halos related to star formation.

Gabriel E. Prochter; Jason X. Prochaska; Scott Burles

2004-11-29T23:59:59.000Z

197

Dynamical Energy Analysis - determining wave energy distributions in complex vibro-acoustical structures  

E-Print Network (OSTI)

We propose a new approach towards determining the distribution of mechanical and acoustic wave energy in complex built-up structures. The technique interpolates between standard Statistical Energy Analysis (SEA) and full ray tracing containing both these methods as limiting case. By writing the flow of ray trajectories in terms of linear phase space operators, it is suggested here to reformulate ray-tracing algorithms in terms of boundary operators containing only short ray segments. SEA can now be identified as a low resolution ray tracing algorithm and typical SEA assumptions can be quantified in terms of the properties of the ray dynamics. The new technique presented here enhances the range of applicability of standard SEA considerably by systematically incorporating dynamical correlations wherever necessary. Some of the inefficiencies inherent in typical ray tracing methods can be avoided using only a limited amount of the geometrical ray information. The new dynamical theory - Dynamical Energy Analysis (DEA) - thus provides a universal approach towards determining wave energy distributions in complex structures.

Gregor Tanner

2008-03-12T23:59:59.000Z

198

A methodology for the structural analysis of composite wind turbine blades under geometric and material induced instabilities  

Science Conference Proceedings (OSTI)

The objective of this work is to develop a modeling strategy for the structural analysis of large three-dimensional laminated composite structures undergoing geometric and material induced instability. A sub-modeling approach is used with multiple mixed-mode ... Keywords: Buckling, Composite materials, Damage mechanics, Delamination, Nonlinear finite element, Solution strategy

L. C. T. Overgaard; E. Lund; P. P. Camanho

2010-10-01T23:59:59.000Z

199

Analysis of Slanted Air-gap Structure of Interior Permanent Magnet Synchronous Motor with Brushless Field Excitation  

E-Print Network (OSTI)

Analysis of Slanted Air-gap Structure of Interior Permanent Magnet Synchronous Motor with Brushless permanent magnet synchronous motor (IPMSM) for application in a hybrid electric vehicle. This unique slanted permanent magnet synchronous motor FEA finite element analysis PM permanent magnet II. INTRODUCTION

Tolbert, Leon M.

200

Geometrically exact 3D beam element for arbitrary large rigid-elastic deformation analysis of aerospace structures  

Science Conference Proceedings (OSTI)

This paper presents a geometrically exact beam theory and a corresponding displacement-based finite-element formulation for modeling and analysis of highly flexible beam components of multibody systems undergoing huge static/dynamic rigid-elastic deformations. ... Keywords: Flexible multibody systems, Geometrically exact beam theory, Jaumann strains, Nonlinear finite element analysis, Nonlinear structural mechanics

Genyong Wu; Xingsuo He; P. Frank Pai

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Coupled hydrodynamic-structural analysis of an integral flowing sodium test loop in the TREAT reactor  

SciTech Connect

A hydrodynamic-structural response analysis of the Mark-IICB loop was performed for the TREAT (Transient Reactor Test Facility) test AX-1. Test AX-1 is intended to provide information concerning the potential for a vapor explosion in an advanced-fueled LMFBR. The test will be conducted in TREAT with unirradiated uranium-carbide fuel pins in the Mark-IICB integral flowing sodium loop. Our analysis addressed the ability of the experimental hardware to maintain its containment integrity during the reference accident postulated for the test. Based on a thermal-hydraulics analysis and assumptions for fuel-coolant interaction in the test section, a pressure pulse of 144 MPa maximum pressure and pulse width of 1.32 ms has been calculated as the reference accident. The response of the test loop to the pressure transient was obtained with the ICEPEL and STRAW codes. Modelling of the test section was completed with STRAW and the remainder of the loop was modelled by ICEPEL.

Zeuch, W.R.; A-Moneim, M.T.

1979-01-01T23:59:59.000Z

202

A structural analysis of natural gas consumption by income class from 1987 to 1993  

SciTech Connect

This study had two major objectives: (1) assess and compare changes in natural gas consumption between 1987 and 1993 by income group and (2) assess the potential influence of energy policy on observed changes in natural gas consumption over time and across income groups. This analysis used U.S. Department of Energy (DOE) data files and involved both the generation of simple descriptive statistics and the use of multivariate regression analysis. The consumption of natural gas by the groups was studied over a six-year period. The results showed that: (1) natural gas use was substantially higher for the highest income group than for the two lower income groups and (2) natural gas consumption declined for the lowest and middle income quintiles and increased for the highest income quintile between 1987 and 1990; between 1990 and 1993, consumption increased for the lowest and middle income quintile, but remained relatively constant for the highest income quintile. The relative importance of the structural and variable factors in explaining consumption changes between survey periods varies by income group. The analysis provides two major energy policy implications: (1) natural gas intensity has been the highest for the lowest income group, indicating that this group is more vulnerable to sudden changes in demand-indicator variables, in particular weather-related variables, than increase natural gas consumption, and (2) the fall in natural gas intensity between 1987 and 1993 may indicate that energy policy has had some impact on reducing natural gas consumption. 11 refs., 4 figs., 16 tabs.

Poyer, D.A.

1996-12-01T23:59:59.000Z

203

A genetic algorithm approach to a neural-network-based inverse kinematics solution of robotic manipulators based on error minimization  

Science Conference Proceedings (OSTI)

The solution of the inverse kinematics problem is fundamental in robot control. Many traditional inverse kinematics problem solutions, such as the geometric, iterative, and algebraic approaches, are inadequate for redundant robots. Recently, much attention ... Keywords: 6-Degree-of-freedom robot, Elman networks, Genetic algorithms, Inverse kinematics problem, Neural networks, Robotics

Ra?It KöKer

2013-02-01T23:59:59.000Z

204

A Proposed Technique for Diagnosis by Radar of Hurricane Structure  

Science Conference Proceedings (OSTI)

A Doppler radar technique is proposed for remote estimation of hurricane structure by sampling the kinematic properties of the hurricane wind field in a relatively small circular area outside the radius of maximum winds. This technique uses ...

Ralph J. Donaldson Jr.

1991-12-01T23:59:59.000Z

205

Very Large Array Observations of Ammonia in Infrared-Dark Clouds II: Internal Kinematics  

E-Print Network (OSTI)

Infrared-dark clouds (IRDCs) are believed to be the birthplaces of rich clusters and thus contain the earliest phases of high-mass star formation. We use the Green Bank Telescope (GBT) and Very Large Array (VLA) maps of ammonia (NH3) in six IRDCs to measure their column density and temperature structure (Paper 1), and here, we investigate the kinematic structure and energy content. We find that IRDCs overall display organized velocity fields, with only localized disruptions due to embedded star formation. The local effects seen in NH3 emission are not high velocity outflows but rather moderate (few km/s) increases in the line width that exhibit maxima near or coincident with the mid-infrared emission tracing protostars. These line width enhancements could be the result of infall or (hidden in NH3 emission) outflow. Not only is the kinetic energy content insufficient to support the IRDCs against collapse, but also the spatial energy distribution is inconsistent with a scenario of turbulent cloud support. We co...

Ragan, Sarah E; Bergin, Edwin A; Wilner, David

2012-01-01T23:59:59.000Z

206

Turbulent Flow Analysis and Coherent Structure Identification in Experimental Models with Complex Geometries  

E-Print Network (OSTI)

Turbulent flows and coherent structures emerging within turbulent flow fields have been extensively studied for the past few decades and a wide variety of experimental and numerical techniques have been developed for measurement and analysis of turbulent flows. The complex nature of turbulence requires methods that can accurately estimate its highly chaotic spatial and temporal behavior. Some of the classical cases of turbulent flows with simpler geometries have been well characterized by means of the existing experimental techniques and numerical models. Nevertheless, since most turbulent fields are of complex geometries; there is an increasing interest in the study of turbulent flows through models with more complicated geometries. In this dissertation, characteristics of turbulent flows through two different facilities with complex geometries are studied applying two different experimental methods. The first study involves the investigation of turbulent impinging jets through a staggered array of rods with or without crossflow. Such flows are crucial in various engineering disciplines. This experiment aimed at modeling the coolant flow behavior and mixing phenomena within the lower plenum of a Very High Temperature Reactor (VHTR). Dynamic Particle Image Velocimetry (PIV) and Matched Index of Refraction (MIR) techniques were applied to acquire the turbulent velocity fields within the model. Some key flow features that may significantly enhance the flow mixing within the test section or actively affect some of the structural components were identified in the velocity fields. The evolution of coherent structures within the flow field is further investigated using a Snapshot Proper Orthogonal Decomposition (POD) technique. Furthermore, a comparative POD method is proposed and successfully implemented for identification of the smaller but highly influential coherent structures which may not be captured in the full-field POD analysis. The second experimental study portrays the coolant flow through the core of an annular pebble bed VHTR. The complex geometry of the core and the highly turbulent nature of the coolant flow passing through the gaps of fuel pebbles make this case quite challenging. In this experiment, a high frequency Hot Wire Anemometry (HWA) system is applied for velocity measurements and investigation of the bypass flow phenomena within the near wall gaps of the core. The velocity profiles within the gaps verify the presence of an area of increased velocity close to the outer reflector wall; however, the characteristics of the coolant flow profile is highly dependent on the gap geometry and to a less extent on the Reynolds number of the flow. The time histories of the velocity are further analyzed using a Power Spectra Density (PSD) technique to acquire information about the energy content and energy transfer between eddies of different sizes at each point within the gaps.

Amini, Noushin

2011-12-01T23:59:59.000Z

207

Lagrangian Coherent Structure Analysis of Terminal Winds Detected by Lidar. Part II: Structure Evolution and Comparison with Flight Data  

Science Conference Proceedings (OSTI)

Using observational data from coherent Doppler light detection and ranging (lidar) systems situated at the Hong Kong International Airport (HKIA), the authors extract Lagrangian coherent structures (LCS) intersecting the flight path of landing ...

Wenbo Tang; Pak Wai Chan; George Haller

2011-10-01T23:59:59.000Z

208

Genomic structure of the choroideremia (CHM) gene and mutation analysis in CHM patients  

Science Conference Proceedings (OSTI)

We have isolated the complete open reading frame (ORF) of the choroideremia (CHM) gene and elucidated its exon-intron structure. The ORF of the CHM gene is located on 15 exons and encodes a protein of 653 amino acids. Among 75 CHM patients investigated for large structural abnormalities, 15 (20%) showed deletions of one or more exons of the gene. The deletions vary in size from a few kb spanning one exon to more than 10 megabases encompassing a large part of Xq21. In addition, we have positioned the X-chromosomal breakpoint in a CHM female with an X;7 translocation between exons 3 and 4. Fine mapping of the deletions indicates that there is no clustering of deletion breakpoints. Moreover, only 2 deletions are located entirely within the CHM gene, indicating that most deletions can be detected by PCR amplification of exons 1 and 15. From within the CHM gene we identified two microsatellite markers, a (CA){sub n}- and a [(TA){sub 4-12}C]{sub n}-like repeat, which should be very valuable for CHM diagnostics in clear-cut CHM families. In patients in which the diagnosis of choroideremia is less obvious, mutation analysis can be performed by PCR-SSCP analysis and direct sequencing. The feasibility of this approach was illustrated by the finding of 10 causative mutations in 12 Danish CHM families investigated. Interestingly, all CHM gene mutations detected thus far give rise to the introduction of a premature stop codon. Missense mutations thus far have not been found.

Bokhoven, H. van; Hurk, J. van den; Bogerd, L. [Univ. Hospital Nijmegen (Netherlands)] [and others

1994-09-01T23:59:59.000Z

209

Thermal analysis and cooling structure design of the primary collimator in CSNS/RCS  

E-Print Network (OSTI)

The rapid cycling synchrotron (RCS) of the China Spallation Neutron Source (CSNS) is a high intensity proton ring with beam power of 100 kW. In order to control the residual activation to meet the requirements of hands-on maintenance, a two-stage collimation system has been designed for the RCS. The collimation system consists of one primary collimator made of thin metal to scatter the beam and four secondary collimators as absorbers. Thermal analysis is an important aspect in evaluating the reliability of the collimation system. The calculation of the temperature distribution and thermal stress of the primary collimator with different materials is carried out by using ANSYS code. In order to control the temperature rise and thermal stress of the primary collimator to a reasonable level, an air cooling structure is intended to be used. The mechanical design of the cooling structure is presented, and the cooling effciency with different chin numbers and wind velocity is also analyzed. Finally, the fatigue life...

Zou, Yi-Qing; Kang, Ling; Qu, Hua-Min; He, Zhe-Xi; Yu, Jie-Bing; 10.1088/1674-1137/37/5/057004

2013-01-01T23:59:59.000Z

210

Structural analysis of magnetic fusion energy systems in a combined interactive/batch computer environment  

SciTech Connect

A system of computer programs has been developed to aid in the preparation of input data for and the evaluation of output data from finite element structural analyses of magnetic fusion energy devices. The system utilizes the NASTRAN structural analysis computer program and a special set of interactive pre- and post-processor computer programs, and has been designed for use in an environment wherein a time-share computer system is linked to a batch computer system. In such an environment, the analyst must only enter, review and/or manipulate data through interactive terminals linked to the time-share computer system. The primary pre-processor programs include NASDAT, NASERR and TORMAC. NASDAT and TORMAC are used to generate NASTRAN input data. NASERR performs routine error checks on this data. The NASTRAN program is run on a batch computer system using data generated by NASDAT and TORMAC. The primary post-processing programs include NASCMP and NASPOP. NASCMP is used to compress the data initially stored on magnetic tape by NASTRAN so as to facilitate interactive use of the data. NASPOP reads the data stored by NASCMP and reproduces NASTRAN output for selected grid points, elements and/or data types.

Johnson, N.E.; Singhal, M.K.; Walls, J.C.; Gray, W.H.

1979-01-01T23:59:59.000Z

211

Basis Reduction for the Shakedown Problem for Bounded Kinematic Hardening Material  

Science Conference Proceedings (OSTI)

Limit and shakedown analysis are effective methods for assessing the load carrying capacity of a given structure. The elasto–plastic behavior of the structure subjected to loads varying in a given load domain is characterized by the shakedown load ... Keywords: Basis reduction, Convex optimization, FEM, Shakedown analysis

Michael Heitzer; Gabriela Pop; Manfred Staat

2000-09-01T23:59:59.000Z

212

Application of Nonlinear Analysis Methods for Identifying Relationships Between Microbial Community Structure and Groundwater Geochemistry  

Science Conference Proceedings (OSTI)

The relationship between groundwater geochemistry and microbial community structure can be complex and difficult to assess. We applied nonlinear and generalized linear data analysis methods to relate microbial biomarkers (phospholipids fatty acids, PLFA) to groundwater geochemical characteristics at the Shiprock uranium mill tailings disposal site that is primarily contaminated by uranium, sulfate, and nitrate. First, predictive models were constructed using feedforward artificial neural networks (NN) to predict PLFA classes from geochemistry. To reduce the danger of overfitting, parsimonious NN architectures were selected based on pruning of hidden nodes and elimination of redundant predictor (geochemical) variables. The resulting NN models greatly outperformed the generalized linear models. Sensitivity analysis indicated that tritium, which was indicative of riverine influences, and uranium were important in predicting the distributions of the PLFA classes. In contrast, nitrate concentration and inorganic carbon were least important, and total ionic strength was of intermediate importance. Second, nonlinear principal components (NPC) were extracted from the PLFA data using a variant of the feedforward NN. The NPC grouped the samples according to similar geochemistry. PLFA indicators of Gram-negative bacteria and eukaryotes were associated with the groups of wells with lower levels of contamination. The more contaminated samples contained microbial communities that were predominated by terminally branched saturates and branched monounsaturates that are indicative of metal reducers, actinomycetes, and Gram-positive bacteria. These results indicate that the microbial community at the site is coupled to the geochemistry and knowledge of the geochemistry allows prediction of the community composition.

Schryver, Jack C.; Brandt, Craig C.; Pfiffner, Susan M.; Palumbo, A V.; Peacock, Aaron D.; White, David C.; McKinley, James P.; Long, Philip E.

2006-02-01T23:59:59.000Z

213

The 29 June 2000 Supercell Observed during STEPS. Part I: Kinematics and Microphysics  

Science Conference Proceedings (OSTI)

This is a two-part study that addresses the kinematic, microphysical, and electrical aspects of a severe storm that occurred in western Kansas on 29 June 2000 observed during the Severe Thunderstorm Electrification and Precipitation Study (STEPS) ...

Sarah A. Tessendorf; L. Jay Miller; Kyle C. Wiens; Steven A. Rutledge

2005-12-01T23:59:59.000Z

214

Kinematic Vertical Motion and Relative Vorticity Profiles in a Long-Lived Midlatitude Convective System  

Science Conference Proceedings (OSTI)

Average kinematic vertical motion and relative vorticity profiles are presented for a long-lived midlatitude convective complex. A breakdown into active convective and stratiform precipitation regions shows very good agreement in the vertical ...

Lance F. Bosart

1986-06-01T23:59:59.000Z

215

The Direct Measurement of the Sizes, Shapes and Kinematics of Falling Hailstones  

Science Conference Proceedings (OSTI)

The kinematic behavior of hailstones falling in their natural environment near the surface was studied using stroboscopic photography in a mobile van. The experimental results permitted determination of the shape and dimensions, velocity, and in ...

Richard J. Matson; Arlen W. Huggins

1980-05-01T23:59:59.000Z

216

Stochastic Models for the Kinematics of Moisture Transport and Condensation in Homogeneous Turbulent Flows  

Science Conference Proceedings (OSTI)

The transport of a condensing passive scalar is studied as a prototype model for the kinematics of moisture transport on isentropic surfaces. Condensation occurs whenever the scalar concentration exceeds a specified local saturation value. Since ...

Paul A. O’Gorman; Tapio Schneider

2006-11-01T23:59:59.000Z

217

Measuring cycling kinematics using a low-cost, flashing LED, multi-camera approach  

E-Print Network (OSTI)

In this thesis a low cost motion capture approach is presented and applied to measure cyclists' kinematics. The motion capture system consists of low cost hardware and custom developed software. Based on still-frame, ...

Gilbertson, Matthew (Matthew W.)

2008-01-01T23:59:59.000Z

218

Effects of the Mixed Layer Time Variability on Kinematic Subduction Rate Diagnostics  

Science Conference Proceedings (OSTI)

An eddy-resolving primitive equation general circulation model is used to estimate water-mass subduction rates in the North Atlantic Ocean subtropical gyre. The diagnostics are based on the instantaneous kinematic approach, which allows the ...

Maria Valdivieso Da Costa; Herlé Mercier; Anne Marie Treguier

2005-04-01T23:59:59.000Z

219

Gauge-potential approach to the kinematics of a moving car  

E-Print Network (OSTI)

A kinematics of the motion of a car is reformulated in terms of the theory of gauge potentials (connection on principal bundle). E(2)-connection originates in the no-slipping contact of the car with a road.

Marian Fecko

1997-03-07T23:59:59.000Z

220

A Closed Form Solution for Inverse Kinematics of Robot Manipulator with Redundancy  

E-Print Network (OSTI)

A closed form equation for inverse kinematics of manipulator with redundancy is derived, using the Lagrangian multiplier method. The proposed equation is proved to provide the exact equilibrium state for the resolved ...

Chang, Pyung H.

1986-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

A Dexterity Measure for the Kinematic Control of Robot Manipulator with Redundany  

E-Print Network (OSTI)

We have derived a new performance measure, product of minors of the Jacobian matrix, that tells how far kinematically redundant manipulators are from singularity. It was demonstrated that previously used performance ...

Chang, Pyung H.

1988-02-01T23:59:59.000Z

222

Analysis of Structural MtrC Models Based on Homology with the Crystal Structure of MtrF  

Science Conference Proceedings (OSTI)

The outer-membrane decahaem cytochrome MtrC is part of the transmembrane MtrCAB complex required for mineral respiration by Shewanella oneidensis. MtrC has significant sequence similarity to the paralogous decahaem cytochrome MtrF, which has been structurally solved through X-ray crystallography. This now allows for homology-based models of MtrC to be generated. The structure of these MtrC homology models contain ten bis-histidine-co-ordinated c-type haems arranged in a staggered cross through a four-domain structure. This model is consistent with current spectroscopic data and shows that the areas around haem 5 and haem 10, at the termini of an octahaem chain, are likely to have functions similar to those of the corresponding haems in MtrF. The electrostatic surfaces around haem 7, close to the ?-barrels, are different in MtrF and MtrC, indicating that these haems may have different potentials and interact with substrates differently.

Edwards, Marcus; Fredrickson, Jim K.; Zachara, John M.; Richardson, David; Clarke, Thomas A.

2012-12-01T23:59:59.000Z

223

Curvature analysis applied to the Cantarell structure, southern Gulf of Mexico: implications for hydrocarbon exploration  

Science Conference Proceedings (OSTI)

The middle Miocene Cantarell structure is host to the largest hydrocarbon field in Mexico. It has been variously interpreted as a fold-and-thrust or a dextral transpressional structure and the hydrocarbons are generally located in fold culminations adjacent ... Keywords: Folds, Geological algorithm, Geological surfaces, Petroleum, Structural geology, Transpressional structure

J. J. Mandujano; R. V. Khachaturov; G. Tolson; J. Duncan Keppie

2005-06-01T23:59:59.000Z

224

A shoe-integrated sensor system for wireless gait analysis and real-time therapeutic feedback  

E-Print Network (OSTI)

Clinical gait analysis currently involves either an expensive analysis in a motion laboratory, using highly accurate, if cumbersome, kinematic systems, or a qualitative analysis with a physician or physical therapist making ...

Morris, Stacy J., 1974-

2004-01-01T23:59:59.000Z

225

The Impact of New EUV Diagnostics on CME-Related Kinematics  

E-Print Network (OSTI)

We present the application of novel diagnostics to the spectroscopic observation of a Coronal Mass Ejection (CME) on disk by the Extreme Ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft. We apply a recently developed line profile asymmetry analysis to the spectroscopic observation of NOAA AR 10930 on 14-15 December 2006 to three raster observations before and during the eruption of a 1000km/s CME. We see the impact that the observer's line-of-sight and magnetic field geometry have on the diagnostics used. Further, and more importantly, we identify the on-disk signature of a high-speed outflow behind the CME in the dimming region arising as a result of the eruption. Supported by recent coronal observations of the STEREO spacecraft, we speculate about the momentum flux resulting from this outflow as a secondary momentum source to the CME. The results presented highlight the importance of spectroscopic measurements in relation to CME kinematics, and the need for full-disk synoptic spectroscopic ob...

McIntosh, S W; Leamon, R J

2010-01-01T23:59:59.000Z

226

Kinematics of the stellar halo and the mass distribution of the Milky Way using BHB stars  

E-Print Network (OSTI)

Here we present a kinematic study of the Galactic halo out to a radius of $\\sim$ 60 kpc, using 4664 blue horizontal branch (BHB) stars selected from the SDSS/SEGUE survey, to determine key dynamical properties. Using a maximum likelihood analysis, we determine the velocity dispersion profiles in spherical coordinates ($\\sigma_{r}$, $\\sigma_{\\theta}$, $\\sigma_{\\phi}$) and the anisotropy profile ($\\beta$). The radial velocity dispersion profile ($\\sigma_{r}$) is measured out to a galactocentric radius of $r \\sim 60$ kpc, but due to the lack of proper-motion information, $\\sigma_{\\theta}$, $\\sigma_{\\phi}$ and $\\beta$ could only be derived directly out to $r \\sim25$ kpc. From a starting value of $\\beta\\approx 0.5$ in the inner parts ($9

Kafle, Prajwal R; Lewis, Geraint F; Bland-Hawthorn, Joss

2012-01-01T23:59:59.000Z

227

Automatic Analysis of Stereoscopic Satellite Image Pairs for Determination of Cloud-Top Height and Structure  

Science Conference Proceedings (OSTI)

A massively parallel processor (MPP) computer has made it practical to do automatic stereo analysis of cloud-top heights from stereoscopic satellite image pairs. The automatic analysis is of equivalent quality to manual analysis while taking ...

A. F. Hasler; J. Strong; R. H. Woodward; H. Pierce

1991-03-01T23:59:59.000Z

228

Managerial Coaching Behavior and Employee Outcomes: A Structural Equation Modeling Analysis  

E-Print Network (OSTI)

During the last two decades, managerial coaching has become increasingly popular in organizations. Despite its popularity, there is a paucity of empirical evidence in the study of managerial coaching outcomes. The purpose of this study was to examine the relationships between perceived managerial coaching behavior and employee self-reported affective and performance-related outcomes based on perceptions of selected organization employees. Three theories, path-goal leadership, career motivation, and organization support, were used to frame the hypothesized conceptual model of managerial coaching outcomes for the current study. The systematic review of relevant literature identified satisfaction with work, role ambiguity, satisfaction with manager, career commitment, job performance, and organization commitment for the potential outcomes of managerial coaching. A 36-item survey including seven existing instruments was utilized to collect data. An estimation of the readability level for the survey was Flesh-Kincaid Grade Level 7.1. The survey was sent electronically to all employees in the selected government organization. The sample included 431 respondents representing a population of 1,399 employees. Descriptive statistics, principal component analysis, Cronbach‘s alpha estimates for reliability, correlation analysis, two-step modeling techniques for structural equation modeling, and Sobel tests were the analysis methods used in the study. The results of the analyses indicated that the hypothesized conceptual model was adequately supported by the empirical data of the study sample (?2/df = 3.53; CFI = .91; IFI = .91; RMSEA = .08). The further investigations suggested that managerial coaching had a direct impact on employee satisfaction with work and role clarity and an indirect impact on satisfaction with work, career commitment, job performance, and organization commitment. Role clarity, as a direct outcome of managerial coaching, influenced job performance—such mediation was consistent with the hypothesized model for the study. The hypothesized model had clear and comprehensive illustrations of how managerial coaching affects work and organization-related variables, satisfaction with work, role clarity, career commitment, job performance, and organization commitment. This study provides empirical support to the proposed benefits of managerial coaching in organizations, and enhances the selected theories by offering additional empirical support to them.

Kim, Sewon

2010-08-01T23:59:59.000Z

229

Accurate structure analysis of Mo[subscript 6]S[subscript y]I[subscript z] nanowires from atomic pair distribution function (PDF) analysis  

SciTech Connect

The structure of the recently discovered systematically reproducible Mo{sub 6}S{sub y}I{sub z} nanowires has been determined from the atomic pair distribution function (PDF) analysis of powder X-ray diffraction data. This total scattering approach was required because the nanowires are not perfectly crystalline and, therefore, the structure cannot be obtained crystallographically. Several nanotube and nanowire models were fit to the PDF data. The resulting best-fit model structure consists of nanowires of Mo{sub 6} octahedra that are bridged by sulfur and terminated on the outside by iodine. This demonstrates the power of total scattering methods in accurately resolving structural issues in nanostructured materials where traditional crystallographic methods fail.

Paglia, G.; Bozin, E.S.; Vengust, D.; Mihailovic, D.; Billinge, S.J.L. (Joseph Stefan Inst.); (MSU)

2010-12-03T23:59:59.000Z

230

Finite element response sensitivity and reliability analysis of Soil-Foundation-Structure-Interaction (SFSI) systems  

E-Print Network (OSTI)

Analysis of Concrete Gravity Dams. ” A Report on Researchysis of Concrete Gravity Dams. ” Proc. Seventh InternationalAnalysis of Concrete Gravity Dams Accounting for Both System

Gu, Quan

2008-01-01T23:59:59.000Z

231

A corpus-based analysis of argument realization by preposition structures  

Science Conference Proceedings (OSTI)

This article studies the issue of argument realization by preposition structures. By examining the preposition structures that are marked as frame elements in FrameNet, the article attempts to give corpus-based attestations to the hypothesized link between ...

Qibo Zhu

2009-07-01T23:59:59.000Z

232

New families of human regulatory RNA structures identified by comparative analysis of vertebrate genomes  

E-Print Network (OSTI)

Regulatory RNA structures are often members of families with multiple paralogous instances across the genome. Family members share functional and structural properties, which allow them to be studied as a whole, facilitating ...

Kellis, Manolis

233

Wavelet Analysis of Cirrus Multiscale Structures from Lidar Backscattering: A Cirrus Uncinus Complex Case Study  

Science Conference Proceedings (OSTI)

Although cirrus cloud structures play an important role in dynamics issues, cloud radiative calculations, and cloud parameter retrievals from satellite measurements, fully understanding cirrus cloud structures still remains a challenge. A case ...

Likun Wang; Kenneth Sassen

2008-10-01T23:59:59.000Z

234

Characterization of Tight Gas Reservoir Pore Structure Using USANS/SANS and Gas Adsorption Analysis  

SciTech Connect

Small-angle and ultra-small-angle neutron scattering (SANS and USANS) measurements were performed on samples from the Triassic Montney tight gas reservoir in Western Canada in order to determine the applicability of these techniques for characterizing the full pore size spectrum and to gain insight into the nature of the pore structure and its control on permeability. The subject tight gas reservoir consists of a finely laminated siltstone sequence; extensive cementation and moderate clay content are the primary causes of low permeability. SANS/USANS experiments run at ambient pressure and temperature conditions on lithologically-diverse sub-samples of three core plugs demonstrated that a broad pore size distribution could be interpreted from the data. Two interpretation methods were used to evaluate total porosity, pore size distribution and surface area and the results were compared to independent estimates derived from helium porosimetry (connected porosity) and low-pressure N{sub 2} and CO{sub 2} adsorption (accessible surface area and pore size distribution). The pore structure of the three samples as interpreted from SANS/USANS is fairly uniform, with small differences in the small-pore range (< 2000 {angstrom}), possibly related to differences in degree of cementation, and mineralogy, in particular clay content. Total porosity interpreted from USANS/SANS is similar to (but systematically higher than) helium porosities measured on the whole core plug. Both methods were used to estimate the percentage of open porosity expressed here as a ratio of connected porosity, as established from helium adsorption, to the total porosity, as estimated from SANS/USANS techniques. Open porosity appears to control permeability (determined using pressure and pulse-decay techniques), with the highest permeability sample also having the highest percentage of open porosity. Surface area, as calculated from low-pressure N{sub 2} and CO{sub 2} adsorption, is significantly less than surface area estimates from SANS/USANS, which is due in part to limited accessibility of the gases to all pores. The similarity between N{sub 2} and CO{sub 2}-accessible surface area suggests an absence of microporosity in these samples, which is in agreement with SANS analysis. A core gamma ray profile run on the same core from which the core plug samples were taken correlates to profile permeability measurements run on the slabbed core. This correlation is related to clay content, which possibly controls the percentage of open porosity. Continued study of these effects will prove useful in log-core calibration efforts for tight gas.

Clarkson, Christopher R [ORNL; He, Lilin [ORNL; Agamalian, Michael [ORNL; Melnichenko, Yuri B [ORNL; Mastalerz, Maria [Indiana Geological Survey; Bustin, Mark [University of British Columbia, Vancouver; Radlinski, Andrzej Pawell [ORNL; Blach, Tomasz P [ORNL

2012-01-01T23:59:59.000Z

235

Origin, Evolution, and Finescale Structure of the St. Valentine’s Day Mesoscale Gravity Wave Observed during STORM-FEST. Part II: Finescale Structure  

Science Conference Proceedings (OSTI)

This paper presents observations of the finescale three-dimensional kinematic and thermodynamic structure of a long-lived mesoscale gravity wave that occurred on 14–15 February 1992 during the Storm-scale Operational and Research Meteorology-...

Muqun Yang; Robert M. Rauber; Mohan K. Ramamurthy

2001-02-01T23:59:59.000Z

236

Effects of Phonon Kinematics and Phonon Anharmonicity on the ...  

Science Conference Proceedings (OSTI)

... allowing the cubic and quartic components of the phonon anharmonicity to be identified. ... First Order Structural Transformations in Symmetrical Tilt S5 Grain ...

237

Structuring of Large-scale Complex Hybrid Systems: from Illustrative Analysis toward Modelization  

Science Conference Proceedings (OSTI)

System structuring is paramount to the development of large-scale complex hybrid systems (LCHS). However, there is no well-established and effective methodology for the structuring of LCHS. Using the approach of illustrating and abstracting, this paper ... Keywords: autonomous system, block-diagram-based model, distributed system, hierarchical system, large-scale complex hybrid system (LCHS), multiple gradation, nested system, nesting, perception–decision link, system geometry, system modelization, system structuring

Huaglory Tianfield

2001-02-01T23:59:59.000Z

238

Statistical shape analysis of neuroanatomical structures based on spherical wavelet transformation  

E-Print Network (OSTI)

Evidence suggests that morphological changes of neuroanatomical structures may reflect abnormalities in neurodevelopment, or relate to a variety of disorders, such as schizophrenia and Alzheimer's disease (AD). Advances ...

Yu, Peng, Ph. D. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

239

Additive spectral method for fuzzy cluster analysis of similarity data including community structure and affinity matrices  

Science Conference Proceedings (OSTI)

An additive spectral method for fuzzy clustering is proposed. The method operates on a clustering model which is an extension of the spectral decomposition of a square matrix. The computation proceeds by extracting clusters one by one, which makes the ... Keywords: Additive fuzzy clustering, Community structure, Lapin transformation, One-by-one clustering, Research activity structure, Spectral fuzzy clustering

Boris Mirkin; Susana Nascimento

2012-01-01T23:59:59.000Z

240

Finite element modelling and analysis of bolted joints of three dimensional tubular structures  

Science Conference Proceedings (OSTI)

A Hungarian "Steel Cooling Tower Consortium" aimed to develop a new type steel cooling tower, in the framework of a governmental R&D project. Members of the structure are prefabricated tubular elements characterized by high radius-to-thickness ratio. ... Keywords: bolted endplate connection, gusset plate, model development, non-linear FEM, steel cooling tower, thin-walled section, tubular structure, virtual experiment

L. G. Vigh; L. Dunai

2002-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Fault block kinematics at a releasing stepover of the Eastern California  

Open Energy Info (EERE)

block kinematics at a releasing stepover of the Eastern California block kinematics at a releasing stepover of the Eastern California shear zone: Partitioning of rotation style in and around the Coso geothermal area and nascent metamorphic core complex Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Fault block kinematics at a releasing stepover of the Eastern California shear zone: Partitioning of rotation style in and around the Coso geothermal area and nascent metamorphic core complex Details Activities (1) Areas (1) Regions (0) Abstract: Pliocene lavas and sediments of Wild Horse Mesa in the Coso Range, CA exhibit clockwise vertical-axis rotation of fault-bounded blocks. This indicates localization of one strand of the Eastern California shear zone/Walker Lane Belt within a large-scale, transtensional, dextral,

242

Fault Block Kinematics at a Releasing Stepover of the Eastern California  

Open Energy Info (EERE)

Fault Block Kinematics at a Releasing Stepover of the Eastern California Fault Block Kinematics at a Releasing Stepover of the Eastern California Shear Zone: Partitioning of Rotation Style in and Around the Coso Geothermal Area and Nascent Metamorphic Core Complex Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Fault Block Kinematics at a Releasing Stepover of the Eastern California Shear Zone: Partitioning of Rotation Style in and Around the Coso Geothermal Area and Nascent Metamorphic Core Complex Abstract Pliocene lavas and sediments of Wild Horse Mesa in the Coso Range, CA exhibit clockwise vertical-axis rotation of fault-bounded blocks. This indicates localization of one strand of the Eastern California shear zone/Walker Lane Belt within a large-scale, transtensional, dextral, releasing stepover. We measured rotations paleomagnetically relative to two

243

DETECTING TRIAXIALITY IN THE GALACTIC DARK MATTER HALO THROUGH STELLAR KINEMATICS  

Science Conference Proceedings (OSTI)

Assuming the dark matter halo of the Milky Way to be a non-spherical potential (i.e., triaxial, prolate, oblate), we show how the assembling process of the Milky Way halo may have left long-lasting stellar halo kinematic fossils due to the shape of the dark matter halo. In contrast with tidal streams, which are associated with recent satellite accretion events, these stellar kinematic groups will typically show inhomogeneous chemical and stellar population properties. However, they may be dominated by a single accretion event for certain mass assembling histories. If the detection of these peculiar kinematic stellar groups were confirmed, they would be the smoking gun for the predicted triaxiality of dark halos in cosmological galaxy formation scenarios.

Rojas-Nino, Armando; Valenzuela, Octavio; Pichardo, Barbara [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, A.P. 70-264, 04510, Mexico, D.F., Universitaria, D.F. (Mexico); Aguilar, Luis A., E-mail: octavio@astro.unam.mx, E-mail: barbara@astro.unam.mx [Observatorio Astronomico Nacional, Universidad Nacional Autonoma de Mexico, Apdo. postal 877, 22800 Ensenada (Mexico)

2012-10-01T23:59:59.000Z

244

Structure and Energy of the 90 degree sign Partial Dislocation in Diamond: A Combined Ab Initio and Elasticity Theory Analysis  

Science Conference Proceedings (OSTI)

The core structure and stability of the 90 degree sign partial dislocation in diamond is studied within isotropic elasticity theory and ab initio total energy calculations. The double-period reconstruction is found to be more stable than the single-period reconstruction for a broad range of stress states. The analysis of the ab initio results shows further that elasticity theory is valid for dislocation spacings as small as 10-20 Angstrom, thus allowing ab initio calculations to provide reliable parameters for continuum theory analysis. (c) 2000 The American Physical Society.

Blase, X. [Department of Physics, University of California, Berkeley, California 94720 (United States); Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); NERSC, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Departement de Physique des Materiaux, U.M.R. No. 5586, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, (France); Lin, Karin [Department of Physics, University of California, Berkeley, California 94720 (United States); Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Canning, A. [NERSC, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Louie, S. G. [Department of Physics, University of California, Berkeley, California 94720 (United States); Chrzan, D. C. [Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Department of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720 (United States)

2000-06-19T23:59:59.000Z

245

A statistical analysis of structural differences in minority household electricity demand  

SciTech Connect

In this paper, the structures for electricity demand in non-Latino Black and White households are compared. Electricity demand will be analyzed within the context of a complete demand system, and statistical tests for structural differences will be systematically conducted in the hope of pinpointing the location of differences within the context of this model. Structural differences in demand are defined as statistically significant differences in a parameter or group of parameters that identify the quantitative relationship between explanatory variables and electricity consumption. Along with population taste differences, which might emanate from historical and cultural population differences, structural differences might also occur because of differences in housing and geographic patterns and as a result of differences in access to markets and information. As a consequence, energy consumption decisions will differ, and the level and composition of energy consumption are likely to vary. In practice, it is nearly impossible to untangle the causes contributing to structural differences, but it is reasonably easy to test for statistical differences. The superficial evidence indicates there is a strong likelihood that structural differences do exist in electricity demand between White and Black households. The null hypothesis, which states that there exist no differences in the structures for electricity demand for Black and White households, is tested.

Poyer, D.A.; Earl, E.

1994-09-01T23:59:59.000Z

246

Structural Analysis of Southern Dixie Valley using LiDAR and...  

Open Energy Info (EERE)

Analysis of Southern Dixie Valley using LiDAR and Low-Sun-Angle Aerial Photography, NAS Fallon Geothermal Exploration Project, Dixie Valley, Nevada Jump to: navigation, search...

247

Mesoscopic structural analysis of bedrock exposures at the Oak Ridge K-25 Site, Oak Ridge, Tennessee  

SciTech Connect

This document presents the detailed study of outcrop of mesoscopic structures during the geologic mapping completed in 1992-1993. The purpose of this study was to document the geometry and style of outcrop scale structures, such as fractures and faults and relate them to map scale structures present in the Oak Ridge K-25 Area. This report was prepared to document site characterization data collected during the scoping phase investigations in accordance with the requirements of the Comprehensive Environmental Response, Compensation, and Liability Act.

Lemiszki, P.J. [Oak Ridge K-25 Site, TN (United States)

1995-07-01T23:59:59.000Z

248

AN INTRIGUING CHROMOSPHERIC JET OBSERVED BY HINODE: FINE STRUCTURE KINEMATICS AND EVIDENCE OF UNWINDING TWISTS  

SciTech Connect

We report a chromospheric jet lasting for more than 1 hr observed by the Hinode Solar Optical Telescope in unprecedented detail. The ejection occurred in three episodes separated by 12-14 minutes, with the amount and velocity of material decreasing with time. The upward velocities range from 438 to 33 km s{sup -1}, while the downward velocities of the material falling back have smaller values (mean: -56km s{sup -1}) and a narrower distribution (standard deviation: 14km s{sup -1}). The average acceleration inferred from parabolic spacetime tracks is 141 m s{sup -2}, a fraction of the solar gravitational acceleration. The jet consists of fine threads (0.''5-2'' wide), which exhibit coherent, oscillatory transverse motions perpendicular to the jet axis and about a common equilibrium position. These motions propagate upward along the jet, with the maximum phase speed of 744+-11 km s{sup -1}at the leading front of the jet. The transverse oscillation velocities range from 151 to 26 km s{sup -1}, amplitudes from 6.0 to 1.9 Mm, and periods from 250 to 536 s. The oscillations slow down with time and cease when the material starts to fall back. The falling material travels along almost straight lines in the original direction of ascent, showing no transverse motions. These observations are consistent with the scenario that the jet involves untwisting helical threads, which rotate about the axis of a single large cylinder and shed magnetic helicity into the upper atmosphere.

Liu Wei; Berger, Thomas E.; Title, Alan M.; Tarbell, Theodore D. [Lockheed Martin Solar and Astrophysics Laboratory, Department ADBS, Building 252, 3251 Hanover Street, Palo Alto, CA 94304 (United States)

2009-12-10T23:59:59.000Z

249

Changes in the Low-Level Kinematic and Thermodynamic Structure of Hurricane Alicia (1983) at Landfall  

Science Conference Proceedings (OSTI)

Aircraft, land station, and buoy data were composited with respect to the center of Hurricane Alicia (1983) for three 8-h periods corresponding to prelandfall in the open Gulf of Mexico, landfall in the Galveston area, and postlandfall in the ...

Mark D. Powell

1987-01-01T23:59:59.000Z

250

COMPARISONS OF THE KINEMATICS AND DEEP STRUCTURES OF THE ZAGROS AND HIMALAYA  

E-Print Network (OSTI)

To provide for the application of measures to foreign persons who transfer to Iran certain goods, services States of America in Congress assembled, SECTION 1. SHORT TITLE. This Act may be cited as the ``Iran Nonproliferation Act of 2000''. SEC. 2. REPORTS ON PROLIFERATION TO IRAN. (a) REPORTS.--The President shall

Hatzfeld, Denis

251

Dual-Aircraft Investigation of the Inner Core of Hurricane Norbert. Part I: Kinematic Structure  

Science Conference Proceedings (OSTI)

On 24–25 September 1984 air motions and physical processes in the eyewall region of Hurricane Norbert were investigated with two National Oceanic and Atmospheric Administration (NOAA) Aircraft Operations Center (AOC) WP-3D research aircraft. One ...

Frank D. Marks Jr.; Robert A. Houze Jr.; John F. Gamache

1992-06-01T23:59:59.000Z

252

The Kinematic Structure of a Hurricane with Sea Level Pressure Less Than 900 mb  

Science Conference Proceedings (OSTI)

A National Oceanic and Atmospheric Administration aircraft recorded the first Doppler radar data in a tropical cyclone with a minimum sea level pressure (MSLP) <900 mb during a reconnaissance mission in Hurricane Gilbert on 14 September 1988, ...

Peter Dodge; Robert W. Burpee; Frank D. Marks Jr.

1999-06-01T23:59:59.000Z

253

The Cape Canaveral Sea and River Breezes: Kinematic Structure and Convective Initiation  

Science Conference Proceedings (OSTI)

This study examines complex flow patterns associated with the Cape Canaveral sea breeze and sea-breeze front using dual-Doppler radar, sounding, and surface data collected on 26 July 1991 during the Convection and Precipitation/Electrification ...

Neil F. Laird; David A. R. Kristovich; Robert M. Rauber; Harry T. Ochs III; L. Jay Miller

1995-10-01T23:59:59.000Z

254

Mesoscale Convective Vortices Observed during BAMEX. Part I: Kinematic and Thermodynamic Structure  

Science Conference Proceedings (OSTI)

Five cases of mesoscale convective vortices (MCVs) are described from observations collected during the Bow Echo and MCV Experiment (BAMEX) over the central United States during the period from 20 May to 6 July 2003. In the present paper, the ...

Christopher A. Davis; Stanley B. Trier

2007-06-01T23:59:59.000Z

255

Electric and Kinematic Structure of the Oklahoma Mesoscale Convective System of 7 June 1989  

Science Conference Proceedings (OSTI)

Balloon soundings of electric field in Oklahoma mesoscale convective systems (MCS's) were made by the National Severe Storms Laboratory (NSSL) during the spring of 1989. A sounding made in the rearward edge of an MCS stratiform rain area on 7 ...

Steven M. Hunter; Terry J. Schuur; Thomas C. Mapshall; W. David Rust

1992-10-01T23:59:59.000Z

256

THE INNER STRUCTURE AND KINEMATICS OF THE SAGITTARIUS DWARF GALAXY AS A PRODUCT OF TIDAL STIRRING  

Science Conference Proceedings (OSTI)

The tidal stirring model envisions the formation of dwarf spheroidal (dSph) galaxies in the Local Group and similar environments via the tidal interaction of disky dwarf systems with a larger host galaxy like the Milky Way. These progenitor disks are embedded in extended dark halos and during the evolution both components suffer strong mass loss. In addition, the disks undergo the morphological transformation into spheroids and the transition from ordered to random motion of their stars. Using collisionless N-body simulations, we construct a model for the nearby and highly elongated Sagittarius (Sgr) dSph galaxy within the framework of the tidal stirring scenario. Constrained by the present orbit of the dwarf, which is fairly well known, the model suggests that in order to produce the majority of tidal debris observed as the Sgr stream, but not yet transform the core of the dwarf into a spherical shape, Sgr must have just passed the second pericenter of its current orbit around the Milky Way. In the model, the stellar component of Sgr is still very elongated after the second pericenter and morphologically intermediate between the strong bar formed at the first pericenter and the almost spherical shape existing after the third pericenter. This is thus the first model of the evolution of the Sgr dwarf that accounts for its observed very elliptical shape. At the present time, there is very little intrinsic rotation left and the velocity gradient detected along the major axis is almost entirely of tidal origin. We model the recently measured velocity dispersion profile for Sgr assuming that mass traces light and estimate its current total mass within 5 kpc to be 5.2 x 10{sup 8} M{sub sun}. To have this mass at present, the model requires that the initial virial mass of Sgr must have been as high as 1.6 x 10{sup 10} M{sub sun}, comparable to that of the Large Magellanic Cloud, which may serve as a suitable analog for the pre-interaction, Sgr progenitor.

Lokas, Ewa L. [Nicolaus Copernicus Astronomical Center, 00-716 Warsaw (Poland); Kazantzidis, Stelios [Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, OH 43210 (United States); Majewski, Steven R. [Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325 (United States); Law, David R. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Mayer, Lucio [Institute for Theoretical Physics, University of Zuerich, CH-8057 Zuerich (Switzerland); Frinchaboy, Peter M., E-mail: lokas@camk.edu.p, E-mail: stelios@mps.ohio-state.ed, E-mail: srm4n@virginia.ed, E-mail: drlaw@astro.ucla.ed, E-mail: lucio@phys.ethz.c, E-mail: p.frinchaboy@tcu.ed [Department of Physics and Astronomy, Texas Christian University, Fort Worth, TX 76129 (United States)

2010-12-20T23:59:59.000Z

257

Thermodynamic and Kinematic Structure of a Snowband and Freezing Rain Event during STORM-FEST  

Science Conference Proceedings (OSTI)

A unique wintertime storm occurred on 12 February 1992 during the Stormscale Operational and Research Meteorology-Fronts Experiment Systems Test (STORM-FEST) field project. This storm consisted of a narrow east–west-oriented snow swath (max 20-cm ...

Hunter Coleman; John Marwitz

2002-02-01T23:59:59.000Z

258

An Analysis of the AVE–SESAME I Period Using Statistical Structure and Correlation Functions  

Science Conference Proceedings (OSTI)

Structure and correlation functions are used to describe atmospheric variability during the 10–11 April day of AVE–SESAME 1979 that coincided with the Red River Valley tornado outbreak. The special mesoscale rawinsonde data are employed in ...

Henry E. Fuelberg; Paul J. Meyer

1984-08-01T23:59:59.000Z

259

Typhoon Structure as Revealed by Aircraft Reconnaissance. Part I: Data Analysis and Climatology  

Science Conference Proceedings (OSTI)

This is the first of two papers describing the structure of northwest Pacific tropical cyclones as revealed by U.S. Air Force aircraft reconnaissance. This first paper describes the background philosophy for this research, the types of flight ...

Candis L. Weatherford; William M. Gray

1988-05-01T23:59:59.000Z

260

An analysis of technical and policy drivers in Current U.S. nuclear weapons force structure  

E-Print Network (OSTI)

U.S. nuclear weapons force structure accounts for the number and types of strategic and nonstrategic weapon systems in various locations that comprise the nuclear arsenal. While exact numbers, locations, and detailed designs ...

Baker, Amanda, S. B. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Empirical analysis of masonry walls : structural design and seismic reinforcement through tilting experiments  

E-Print Network (OSTI)

Masonry is a fundamental building material that is used for a significant proportion of structures across the world, many of which lie in potentially hazardous environments. While masonry naturally has poor performance ...

Jimenez, Daniel D. (Daniel David)

2011-01-01T23:59:59.000Z

262

Redesign and shock analysis of HALIFAX class frigate gas turbine uptake structure  

E-Print Network (OSTI)

The gas turbine exhaust uptakes in the HALIFAX class frigates of the Canadian Navy have experienced thermally-induced fatigue cracking since soon after the commissioning of these ships. The uptake structure is heavily ...

Summers, Simon A. (Simon Andrew)

2008-01-01T23:59:59.000Z

263

Temporal Structure of the Southern Oscillation as Revealed by Waveform and Wavelet Analysis  

Science Conference Proceedings (OSTI)

Wavelet transforms (WLT) and waveform transforms (WFT) are effective tools that reveal temporal structure of nonstationary time series. The authors discuss principles and practical aspects of their geophysical applications. The WLT can display ...

Bin Wang; Yan Wang

1996-07-01T23:59:59.000Z

264

Technical Systems with Structural and Time Redundancy: A Probabilistic Analysis of Their Performance  

Science Conference Proceedings (OSTI)

A generalized interpretation is given to the reliability concepts so that the influence of different random actions (perturbations) on the structure of technical systems can be taken into account within a unified methodological approach. Typical subsystems ...

R. V. Kakubava; R. A. Khurodze

2004-05-01T23:59:59.000Z

265

Theoretical band structure analysis on possible high-Z detector materials  

SciTech Connect

Theoretical energy band structure calculations have been utilized to investigate several high-Z materials for potential use as ambient temperature radiation detectors. Using the pseudopotential technique, the band structure for HgI$sub 2$ has been determined and the effective masses of the holes and electrons have been estimated. Theoretical mobilities of the electrons and holes as a function of temperature have been computed for HgI$sub 2$ and CdTe and are compared to experimental data. (auth)

Yee, J.H.; Sherohman, J.W.; Armantrout, G.A.

1975-11-18T23:59:59.000Z

266

Lagrangian Methods for Climatological Analysis of Regional Atmospheric Transport  

Science Conference Proceedings (OSTI)

A quantitative climatological analysis of regional-scale atmospheric transport in Texas is developed using previously described Lagrangian (kinematic) trajectory methods. The trajectories are computed using resolved winds from 1979 to 2001 from ...

Darielle N. Dexheimer; Kenneth P. Bowman

2004-04-01T23:59:59.000Z

267

Analyzing kinematics and solving active/constrained forces of a 4-dof 3sps+sp parallel manipulator  

Science Conference Proceedings (OSTI)

A novel 3SPS+SP parallel manipulator (PM) with 4-dof is proposed. Its kinematics and statics are analyzed systematically. The analytic formulae for solving the displacement, velocity, acceleration, workspace, active forces and constrained force are derived. ... Keywords: Active force, Constrained force, Kinematics, Parallel manipulator, Workspace

Yi Lu; Bo Hu

2009-01-01T23:59:59.000Z

268

A comparative analysis of business structures suitable forfarmer-owned wind power projects in the United States  

DOE Green Energy (OSTI)

For years, farmers in the United States have looked with envy on their European counterparts' ability to profitably farm the wind through ownership of distributed, utility-scale wind projects. Only within the past few years, however, has farmer- or community-owned wind power development become a reality in the United States. The primary hurdle to this type of development in the United States has been devising and implementing suitable business and legal structures that enable such projects to take advantage of tax-based federal incentives for wind power. This article discusses the limitations of such incentives in supporting farmer- or community-owned wind projects, describes four ownership structures that potentially overcome such limitations, and finally conducts comparative financial analysis on those four structures, using as an example a hypothetical 1.5 MW farmer-owned project located in the state of Oregon. We find that material differences in the competitiveness of each structure do exist, but that choosing the best structure for a given project will largely depend on the conditions at hand; e.g., the ability of the farmer(s) to utilize tax credits, preference for individual versus ''cooperative'' ownership, and the state and utility service territory in which the project will be located.

Bolinger, Mark; Wiser, Ryan

2004-11-11T23:59:59.000Z

269

Phase Structure and Cyclic Deformation in Eutectic Tin-Lead Alloy: A Numerical Analysis  

Science Conference Proceedings (OSTI)

This study is devoted to providing a mechanistic rationale of coarsening induced failure in solder alloys during thermomechanical fatigue. Micromechanical modeling of cyclic deformation of eutectic tin-lead alloy was undertaken using the finite element method. The models consist of regularly arranged tin-rich and lead-rich phases, simulating the lamellar array and colony structure in a typical eutectic system. A fine structure and a coarse structure, bearing the same phase fraction but different in the aspect ratio of each lead-rich layer and in the number of lead-rich layers in each colony, are utilized for representing the microstructure before and after coarsening, respectively. Both phases are treated as elastic-plastic solids with their respective properties. For simplicity the creep effect is ignored without compromising the main objective of this study. Cyclic loading under pure shear and uniaxial conditions is modeled. It is found that both the fine and coarse structures exhibit essentially the same macroscopic stress-strain response. The coarse structure, however, shows a greater maximum effective plastic strain on a local scale throughout the deformation. The numerical result implies that, in a solder joint, a locally coarsened region may not be mechanically weaker than its surrounding, but it is subject to early damage initiation due to accumulated plasticity. Other implications regarding solder alloy failure and micromechanical modeling of two-phase materials are discussed.

FANG,HUEI ELIOT; Li,W; SHEN,Y.-L

1999-09-09T23:59:59.000Z

270

A combined structural and dynamic modelling approach for dependability analysis in smart grid  

Science Conference Proceedings (OSTI)

The wide application of information and communication technology (ICT) in smart grid will introduce new dependencies. Therefore, new dependability analysis of the power grid, the ICT infrastructure and their interactions are needed to ensure a highly ...

Jonas Wäfler; Poul E. Heegaard

2013-03-01T23:59:59.000Z

271

Automated methods of textual content analysis and description of text structures  

E-Print Network (OSTI)

Universal Semantic Language (USL) is a semi-formalized approach for the description of knowledge (a knowledge representation tool). The idea of USL was introduced by Vladimir Smetacek in the system called SEMAN which was used for keyword extraction tasks in the former Information centre of the Czechoslovak Republic. However due to the dissolution of the centre in early 90's, the system has been lost. This thesis reintroduces the idea of USL in a new context of quantitative content analysis. First we introduce the historical background and the problems of semantics and knowledge representation, semes, semantic fields, semantic primes and universals. The basic methodology of content analysis studies is illustrated on the example of three content analysis tools and we describe the architecture of a new system. The application was built specifically for USL discovery but it can work also in the context of classical content analysis. It contains Natural Language Processing (NLP) components and employs the algorith...

Chýla, Roman

272

Further Analysis of the Composite Wind and Thermodynamic Structure of the 12 September GATE Squall Line  

Science Conference Proceedings (OSTI)

An objective analysis technique is applied to the time-composite wind and thermodynamic fields of the 12 September GATE tropical squall line. Previous subjective analyses described by Gamache and Houze are confirmed and several new results are ...

John F. Gamache; Robert A. Houze Jr.

1985-08-01T23:59:59.000Z

273

Wavelet Analysis of Coherent Structures at the Atmosphere-Forest Interface  

Science Conference Proceedings (OSTI)

Wavelet analysis was applied to turbulence data for temperature and vertical velocity within and above a deciduous forest. This method appears to provide an objective technique for examining thermal and flow fields associated with coherent ...

W. Gao; B. L. Li

1993-11-01T23:59:59.000Z

274

Dynamic structural analysis of a head assembly for a large loop-type LMFBR  

SciTech Connect

An investigation is presented on the dynamic structural response of the primary vessel's head closure to slug impact loadings generated from a 1000 MJ source term. The reference reactor considered was designed in a loop configuration. The head structure consisted of a deck and a triple rotatable plug assembly. Two designs were considered for the deck structure: a reference design and an alternate design. The reference deck was designed as a single flat annular plate. For the alternate design, the deck plate was reinforced by adding an extender cylinder with a flange and flanged webs between the deck-plate and cylinder. The investigation showed that the reference design cannot maintain containment integrity when subjected to slug loading generated by a 1000 MJ source term. It was determined that the head deformed excessively.

Kulak, R.F.; Fiala, C.

1984-01-01T23:59:59.000Z

275

Structural Analysis of Rtt106p Reveals a DNA Binding Role Required for Heterochromatin Silencing  

Science Conference Proceedings (OSTI)

Rtt106p is a Saccharomyces cerevisiae histone chaperone with roles in heterochromatin silencing and nucleosome assembly. The molecular mechanism by which Rtt106p engages in chromatin dynamics remains unclear. Here, we report the 2.5 {angstrom} crystal structure of the core domain of Rtt106p, which adopts an unusual 'double pleckstrin homology' domain architecture that represents a novel structural mode for histone chaperones. A histone H3-H4-binding region and a novel double-stranded DNA-binding region have been identified. Mutagenesis studies reveal that the histone and DNA binding activities of Rtt106p are involved in Sir protein-mediated heterochromatin formation. Our results uncover the structural basis of the diverse functions of Rtt106p and provide new insights into its cellular roles.

Liu, Y.; Huang, H; Zhou, B; Wang, S; Hu, Y; Li, X; Liu, J; Niu, L; Wu, J; et. al.

2010-01-01T23:59:59.000Z

276

A Diagnostic Study of Jet Streaks: Kinematic Signatures and Relationship to Coherent Tropopause Disturbances  

Science Conference Proceedings (OSTI)

A diagnostic study is conducted of the kinematics and evolution of upper-level jet streaks representative of three (of the four) phases in the Shapiro conceptual model of a jet streak progressing through a synoptic-scale baroclinic wave over ...

Matthew E. Pyle; Daniel Keyser; Lance F. Bosart

2004-01-01T23:59:59.000Z

277

Molecular Tagging Diagnostics for the Study of Kinematics and Mixing in Liquid-Phase Flows  

E-Print Network (OSTI)

Molecular Tagging Diagnostics for the Study of Kinematics and Mixing in Liquid-Phase Flows M. M based on molecular tagging approaches. These developments take advantage of a class of newly engineered and caged fluorescein are briefly discussed and compared. The application of molecular tagging velocimetry

Koochesfahani, Manoochehr M.

278

Structure function measurements in muon?iron and muon?proton scattering, and a QCD analysis  

Science Conference Proceedings (OSTI)

The structure function F2 has been measured in the range 3.0

The European Muon Collaboration

1980-01-01T23:59:59.000Z

279

Comparative analysis of structural concrete quality assurance practices on three fossil fuel power plant construction projects. Final report  

SciTech Connect

The basic objective of this research effort was to perform a comparative analysis of the Quality Assurance practices related to the structural concrete phase on three fossil fuel power plant projects which are (or have been) under construction in the United States in the past ten years. This analysis identified the response of each Quality Assurance program to criteria similar to those which apply on nuclear power plant projects. The major emphasis was placed on the construction aspects of the structural concrete phase of each project. The engineering and design aspects were examined whenever they interfaced with the construction aspects. For those aspects of the Quality Assurance system which can be considered managerial in nature (i.e., organizational relationships, types of Quality Assurance programs, corrective action procedures, etc.) an attempt has been made to present the alternative approaches that were identified. For those aspects of the Quality Assurance system which are technical in nature (i.e., the frequency of testing for slump, compressive strength, etc.) an attempt has been made to present a comparative analysis between projects and in relation to the recommended or mandated practices presented in the appropriate industry codes and standards.

Willenbrock, J.H.; Thomas, H.R. Jr.; Burati, J.L. Jr.

1978-06-01T23:59:59.000Z

280

Comparative analysis of structural concrete quality assurance practices on nine nuclear power plant construction projects. Final report  

SciTech Connect

The basic objective of this research effort was to perform a comparative analysis of the Quality Assurance practices related to the structural concrete phase on nine nuclear power plant projects which are (or have been) under construction in the United States in the past ten years. This analysis identified the response of each Quality Assurance program to the applicable criteria of 10 CFR Part 50, Appendix B as well as to the pertinent regulatory requirements and industry standards. The major emphasis was placed on the construction aspects of the structural concrete phase of each project. The engineering and design aspects were examined whenever they interfaced with the construction aspects. For those aspects of the Quality Assurance system which can be considered managerial in nature (i.e., organizational relationships, types of Quality Assurance programs, corrective action procedures, etc.) an attempt has been made to present the alternative approaches that were identified. For those aspects of the Quality Assurance system which are technical in nature (i.e., the frequency of testing for slump, compressive strength, etc.) an attempt has been made to present a comparative analysis between projects and in relation to the recommended or mandated practices presented in the appropriate industry codes and standards.

Willenbrock, J.H.; Thomas, H.R. Jr.; Burati, J.L. Jr.

1978-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

X-rays structural analysis and thermal stability studies of the ternary compound {alpha}-AlFeSi  

Science Conference Proceedings (OSTI)

From literature data presently available, the decomposition temperature and the nature of the decomposition reaction of the ternary compound {alpha}-AlFeSi (also designated as {alpha}{sub H} or {tau}{sub 5}) are not clearly identified. Moreover, some uncertainties remain concerning its crystal structure. The crystallographic structure and thermochemical behaviour of the ternary compound {alpha}-AlFeSi were meticulously studied. The crystal structure of {alpha}-AlFeSi was examined at room temperature from X-ray single crystal intensity data. It presents hexagonal symmetry, space group P6{sub 3}/mmc with unit cell parameters (293 K) a=12.345(2) A and c=26.210(3) A (V=3459 A{sup 3}). The average chemical formula obtained from refinement is Al{sub 7.1}Fe{sub 2}Si. From isothermal reaction-diffusion experiments and Differential Thermal Analysis, the title compound decomposes peritectically upon heating into {theta}-Fe{sub 4}Al{sub 13}(Si), {gamma}-Al{sub 3}FeSi and a ternary Al-rich liquid. Under atmospheric pressure, the temperature of this reversible transformation has been determined to be 772{+-}12 {sup o}C. -- Graphical abstract: Partial representation of the crystal structure of the {alpha}-Al{sub 7.1}Fe{sub 2}Si compound. Display Omitted Highlights: The main findings of our work are: {yields} a detailed X-rays crystal structure determination of the ternary compound {alpha}-AlFeSi. {yields} The precision of the silicon atoms positions in the crystal structure. {yields} A precised determination of the decomposition temperature of this compound.

Roger, J., E-mail: jerome.roger@univ-lyon1.f [Laboratoire des Multimateriaux et Interfaces, UMR CNRS no. 5615, Universite Claude Bernard Lyon 1, F-69622 Villeurbanne Cedex (France); Bosselet, F.; Viala, J.C. [Laboratoire des Multimateriaux et Interfaces, UMR CNRS no. 5615, Universite Claude Bernard Lyon 1, F-69622 Villeurbanne Cedex (France)

2011-05-15T23:59:59.000Z

282

Structural and Inhibition Analysis Reveals the Mechanism of Selectivity of a Series of Aggrecanase Inhibitors  

DOE Green Energy (OSTI)

Several inhibitors of a series of cis-1(S)2(R)-amino-2-indanol-based compounds were reported to be selective for the aggrecanases, ADAMTS-4 and -5 over other metalloproteases. To understand the nature of this selectivity for aggrecanases, the inhibitors, along with the broad spectrum metalloprotease inhibitor marimastat, were independently bound to the catalytic domain of ADAMTS-5, and the corresponding crystal structures were determined. By comparing the structures, it was determined that the specificity of the relative inhibitors for ADAMTS-5 was not driven by a specific interaction, such as zinc chelation, hydrogen bonding, or charge interactions, but rather by subtle and indirect factors, such as water bridging, ring rigidity, pocket size, and shape, as well as protein conformation flexibility.

Tortorella, Micky D.; Tomasselli, Alfredo G.; Mathis, Karl J.; Schnute, Mark E.; Woodard, Scott S.; Munie, Grace; Williams, Jennifer M.; Caspers, Nicole; Wittwer, Arthur J.; Malfait, Anne-Marie; Shieh, Huey-Sheng; Pfizer

2009-10-07T23:59:59.000Z

283

Soil structural analysis tools and properties for Hanford site waste tank evaluation  

Science Conference Proceedings (OSTI)

As Hanford Site contractors address future structural demands on nuclear waste tanks, built as early as 1943, it is necessary to address their current safety margins and ensure safe margins are maintained. Although the current civil engineering practice guidelines for soil modeling are suitable as preliminary design tools, future demands potentially result in loads and modifications to the tanks that are outside the original design basis and current code based structural capabilities. For example, waste removal may include cutting a large hole in a tank. This report addresses both spring modeling of site soils and finite-element modeling of soils. Additionally seismic dynamic modeling of Hanford Site soils is also included. Of new and special interest is Section 2.2 that Professor Robert D. Holtz of the University of Washington wrote on plane strain soil testing versus triaxial testing with Hanford Site application to large buried waste tanks.

Moore, C.J.; Holtz, R.D.; Wagenblast, G.R.; Weiner, E.D.; Marlow, R.S.

1995-09-01T23:59:59.000Z

284

Handbook on dynamics of jointed structures.  

Science Conference Proceedings (OSTI)

The problem of understanding and modeling the complicated physics underlying the action and response of the interfaces in typical structures under dynamic loading conditions has occupied researchers for many decades. This handbook presents an integrated approach to the goal of dynamic modeling of typical jointed structures, beginning with a mathematical assessment of experimental or simulation data, development of constitutive models to account for load histories to deformation, establishment of kinematic models coupling to the continuum models, and application of finite element analysis leading to dynamic structural simulation. In addition, formulations are discussed to mitigate the very short simulation time steps that appear to be required in numerical simulation for problems such as this. This handbook satisfies the commitment to DOE that Sandia will develop the technical content and write a Joints Handbook. The content will include: (1) Methods for characterizing the nonlinear stiffness and energy dissipation for typical joints used in mechanical systems and components. (2) The methodology will include practical guidance on experiments, and reduced order models that can be used to characterize joint behavior. (3) Examples for typical bolted and screw joints will be provided.

Ames, Nicoli M.; Lauffer, James P.; Jew, Michael D.; Segalman, Daniel Joseph; Gregory, Danny Lynn; Starr, Michael James; Resor, Brian Ray

2009-07-01T23:59:59.000Z

285

Electricity Markets and Policy Group Energy Analysis Department Wind Project Financing Structures  

E-Print Network (OSTI)

characteristics of each: - Wind projects have higher capital costs but lower operating costs (e.g., no fuel costs project and finances all costs. No other investor or lender capital is involved. Corporate entity is ableElectricity Markets and Policy Group · Energy Analysis Department 1 Wind Project Financing

286

Structural integrity analysis of the degraded drywell containment at the Oyster Creek Nuclear generating station.  

SciTech Connect

This study examines the effects of the degradation experienced in the steel drywell containment at the Oyster Creek Nuclear Generating Station. Specifically, the structural integrity of the containment shell is examined in terms of the stress limits using the ASME Boiler and Pressure Vessel (B&PV) Code, Section III, Division I, Subsection NE, and examined in terms of buckling (stability) using the ASME B&PV Code Case N-284. Degradation of the steel containment shell (drywell) at Oyster Creek was first observed during an outage in the mid-1980s. Subsequent inspections discovered reductions in the shell thickness due to corrosion throughout the containment. Specifically, significant corrosion occurred in the sandbed region of the lower sphere. Since the presence of the wet sand provided an environment which supported corrosion, a series of analyses were conducted by GE Nuclear Energy in the early 1990s. These analyses examined the effects of the degradation on the structural integrity. The current study adopts many of the same assumptions and data used in the previous GE study. However, the additional computational recourses available today enable the construction of a larger and more sophisticated structural model.

Petti, Jason P.

2007-01-01T23:59:59.000Z

287

Characterizing Structural Controls of EGS-Candidate and Conventional  

Open Energy Info (EERE)

Controls of EGS-Candidate and Conventional Controls of EGS-Candidate and Conventional Geothermal Reservoirs in the Great Basin: Developing Successful Exploration Strategies in Extended Terranes Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Characterizing Structural Controls of EGS-Candidate and Conventional Geothermal Reservoirs in the Great Basin: Developing Successful Exploration Strategies in Extended Terranes Project Type / Topic 1 Recovery Act: Enhanced Geothermal Systems Component Research and Development/Analysis Project Type / Topic 2 Geophysical Exploration Technologies Project Description The project group proposes to systematically assess the structural controls of geothermal systems in the Great Basin and adjacent regions. Phase I (Year 1) involves a broad inventory of structural settings of geothermal systems in the Great Basin, Walker Lane, and southern Cascades, with the aim of developing conceptual structural models and a structural catalogue of the most favorable structural environments. The regional stress field will be used to evaluate slip tendency on faults in the various tectonic provinces and thus determine which faults are most likely to accommodate dilation and slip in each setting. This overview will permit selection of representative sites (5 or 6 total) for more detailed studies in Phases II and III (Years 2-3). Sites will be selected on the basis of quality of exposure, apparent potential for geothermal development, and general type of system, so that all major types of systems can be evaluated and compared in this project (e.g., magmatic vs. nonmagmatic). The detailed investigations will include geologic mapping, kinematic analysis, stress determinations, gravity surveys, integration of available geophysical data, slip tendency analysis, and 3D modeling. In Year 3, the detailed studies will be completed and data synthesized to a) compare structural controls in various tectonic settings, b) complete the structural catalogue, and c) apply knowledge to exploration strategies and selection of drilling sites.

288

Structure-Function Analysis of Edible FatsChapter 3 Powder X-ray Diffraction of Triglycerides in the Study of Polymorphism  

Science Conference Proceedings (OSTI)

Structure-Function Analysis of Edible Fats Chapter 3 Powder X-ray Diffraction of Triglycerides in the Study of Polymorphism Methods and Analyses eChapters Food Science & Technology Health - Nutrition - Biochemistry Processing Methods - An

289

Structural changes in switchgrass lignin and hemicelluloses during pretreatments by NMR analysis  

NLE Websites -- All DOE Office Websites (Extended Search)

changes changes in switchgrass lignin and hemicelluloses during pretreatments by NMR analysis Reichel Samuel a, c , Marcus Foston a, c , Nan Jiang a, c , Lenong Allison a, c , Arthur J. Ragauskas a, b, c, * a School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, USA b Institute of Paper Science and Technology, Georgia Institute of Technology, Atlanta, GA, USA c BioEnergy Science Center, USA a r t i c l e i n f o Article history: Received 14 May 2011 Received in revised form 13 August 2011 Accepted 25 August 2011 Available online xxx Keywords: Switchgrass Pretreatment HSQC NMR analysis Lignin a b s t r a c t Switchgrass is currently being developed as a sustainable bio-energy crop due to its broad adaptability, high mass yield and low agricultural input. Its current conversion to biofuels is detrimentally impacted by its native recalcitrance which is typically addressed using

290

NOAA/DOE CWP structural analysis package. [CWPFLY, CWPEXT, COTEC, and XOTEC codes  

DOE Green Energy (OSTI)

The theoretical development and computer code user's manual for analysis of the Ocean Thermal Energy Conversion (OTEC) plant cold water pipe (CWP) are presented. The analysis of the CWP includes coupled platform/CWP loadngs and dynamic responses. This report with the exception of the Introduction and Appendix F was orginally published as Hydronautics, Inc., Technical Report No. 7825-2 (by Barr, Chang, and Thasanatorn) in November 1978. A detailed theoretical development of the equations describing the coupled platform/CWP system and preliminary validation efforts are described. The appendices encompass a complete user's manual, describing the inputs, outputs and operation of the four component programs, and detail changes and updates implemented since the original release of the code by Hydronautics. The code itself is available through NOAA's Office of Ocean Technology and Engineering Services.

Pompa, J.A.; Lunz, D.F. (eds.)

1979-09-01T23:59:59.000Z

291

Neural network system and methods for analysis of organic materials and structures using spectral data  

DOE Patents (OSTI)

Apparatus and processes are described for recognizing and identifying materials. Characteristic spectra are obtained for the materials via spectroscopy techniques including nuclear magnetic resonance spectroscopy, infrared absorption analysis, x-ray analysis, mass spectroscopy and gas chromatography. Desired portions of the spectra may be selected and then placed in proper form and format for presentation to a number of input layer neurons in an offline neural network. The network is first trained according to a predetermined training process; it may then be employed to identify particular materials. Such apparatus and processes are particularly useful for recognizing and identifying organic compounds such as complex carbohydrates, whose spectra conventionally require a high level of training and many hours of hard work to identify, and are frequently indistinguishable from one another by human interpretation.

Meyer, B.J.; Sellers, J.P.; Thomsen, J.U.

1993-06-08T23:59:59.000Z

292

Neural network system and methods for analysis of organic materials and structures using spectral data  

DOE Patents (OSTI)

Apparatus and processes for recognizing and identifying materials. Characteristic spectra are obtained for the materials via spectroscopy techniques including nuclear magnetic resonance spectroscopy, infrared absorption analysis, x-ray analysis, mass spectroscopy and gas chromatography. Desired portions of the spectra may be selected and then placed in proper form and format for presentation to a number of input layer neurons in an offline neural network. The network is first trained according to a predetermined training process; it may then be employed to identify particular materials. Such apparatus and processes are particularly useful for recognizing and identifying organic compounds such as complex carbohydrates, whose spectra conventionally require a high level of training and many hours of hard work to identify, and are frequently indistinguishable from one another by human interpretation.

Meyer, Bernd J. (Athens, GA); Sellers, Jeffrey P. (Suwanee, GA); Thomsen, Jan U. (Fredricksberg, DK)

1993-01-01T23:59:59.000Z

293

Structural and spectropotentiometric analysis of Blastochloris viridis heterodimer mutant reaction center  

Science Conference Proceedings (OSTI)

Heterodimer mutant reaction centers (RCs) of Blastochloris viridis were crystallized using microfluidic technology. In this mutant, a leucine residue replaced the histidine residue which had acted as a fifth ligand to the bacteriochlorophyll (BChl) of the primary electron donor dimer M site (HisM200). With the loss of the histidine-coordinated Mg, one bacteriochlorophyll of the special pair was converted into a bacteriopheophytin (BPhe), and the primary donor became a heterodimer supermolecule. The crystals had dimensions 400 x 100 x 100 {micro}m, belonged to space group P4{sub 3}2{sub 1}2, and were isomorphous to the ones reported earlier for the wild type (WT) strain. The structure was solved to a 2.5 {angstrom} resolution limit. Electron-density maps confirmed the replacement of the histidine residue and the absence of Mg. Structural changes in the heterodimer mutant RC relative to the WT included the absence of the water molecule that is typically positioned between the M side of the primary donor and the accessory BChl, a slight shift in the position of amino acids surrounding the site of the mutation, and the rotation of the M194 phenylalanine. The cytochrome subunit was anchored similarly as in the WT and had no detectable changes in its overall position. The highly conserved tyrosine L162, located between the primary donor and the highest potential heme C{sub 380}, revealed only a minor deviation of its hydroxyl group. Concomitantly to modification of the BChl molecule, the redox potential of the heterodimer primary donor increased relative to that of the WT organism (772 mV vs. 517 mV). The availability of this heterodimer mutant and its crystal structure provides opportunities for investigating changes in light-induced electron transfer that reflect differences in redox cascades.

Ponomarenko, Nina S.; Li, Liang; Marino, Antony R.; Tereshko, Valentina; Ostafin, Agnes; Popova, Julia A.; Bylina, Edward J.; Ismagilov, Rustem F.; Norris, Jr., James R.; (UC); (Utah)

2010-07-22T23:59:59.000Z

294

Structural analysis of porous rock reservoirs subjected to conditions of compressed air energy storage  

DOE Green Energy (OSTI)

Investigations are described which were performed to assess the structural behavior of porous rock compressed air energy storage (CAES) reservoirs subjected to loading conditions of temperature and pressure felt to be typical of such an operation. Analyses performed addressed not only the nominal or mean reservoir response but also the cyclic response due to charge/discharge operation. The analyses were carried out by assuming various geometrical and material related parameters of a generic site. The objective of this study was to determine the gross response of a generic porous reservoir. The site geometry for this study assumed a cylindrical model 122 m in dia and 57 m high including thicknesses for the cap, porous, and base rock formations. The central portion of the porous zone was assumed to be at a depth of 518 m and at an initial temperature of 20/sup 0/C. Cyclic loading conditions of compressed air consisted of pressure values in the range of 4.5 to 5.2 MPa and temperature values between 143 and 204/sup 0/C.Various modes of structural behavior were studied. These response modes were analyzed using loading conditions of temperature and pressure (in the porous zone) corresponding to various operational states during the first year of simulated site operation. The results of the structural analyses performed indicate that the most severely stressed region will likely be in the wellbore vicinity and hence highly dependent on the length of and placement technique utilized in the well production length. Analyses to address this specific areas are currently being pursued.

Friley, J.R.

1980-01-01T23:59:59.000Z

295

Identification of buried structures (aerial surveillance and analysis of buried waste) long-range project plan  

SciTech Connect

This long-range plan presents the plan (i.e., budget, schedule, justification, and plans for technology deployment) for implementation of the Identification of Buried Structures project. Two subcontractors will test and demonstrate their technologies at the Idaho National Engineering Laboratory during October and November 1991, and will analyze their data and submit final reports to EG&G Idaho, Inc., by the end of December 1991. By February 21, 1992, EG&G Idaho will present a final report to the Department of Energy, assessing the subcontractor`s results and recommending further action.

Williams, K.L.

1991-11-01T23:59:59.000Z

296

Core analysis of Chattanooga shale structures west of Pine Mountain fault, Whitley County, Kentucky  

SciTech Connect

A 100-ft oriented core from the Chandler 1 well in Whitley County, Kentucky, sampled the entire Chattanooga Shale section 10 mi west of the Pine Mountain fault. Cored slickenlined structures include 76 bedding-plane faults, four strike-slip faults, and 44 thrust faults. One interpreted kink band was encountered. Slickenline trends, fault geometry, interpreted paleo-stress fields, and chronology of structural evolution do not reflect the N30/sup 0/W transposition direction of the Pine Mountain sheet (seated in Chattanooga Shale) or N60/sup 0/E strike of the Pine Mountain fault. For example, 62% of 81 bedding-fault slickenline orientations trend N20/sup 0/-90/sup 0/W with N60/sup 0/-70/sup 0/W dominant. A secondary direction (32% of bedding slickenlines) strikes N40/sup 0/-80/sup 0/E with N60/sup 0/-70/sup 0/E dominant. Only 9% of bedding-fault slickenlines trend N25/sup 0/-35/sup 0/W. In addition, northwest-trending slickenlines formed first on four of five bedding faults containing both major trends. Thrust faults group into five mean attitudes. Four orientations (N31/sup 0/W, 38/sup 0/NE); N40/sup 0/W, 36/sup 0/SW; N15/sup 0/E, 45/sup 0/SE); and N46/sup 0/1E, 42/sup 0/NW) may define two conjugate shear sets that imply horizontal maximum compressive stress directions of N58/sup 0/W and N54/sup 0/E, respectively. The fifth trend (N88/sup 0/W, 48/sup 0/NE) may relate genetically to strike-slip faults oriented N20/sup 0/W and N60/sup 0/E that indicate horizontal maximum compressive stresses oriented N2/sup 0/-18/sup 0/E. Overprinted thrust-fault slickenlines and faults offsetting faults suggest that maximum compressive stresses first acted northwest-southeast, then northeast-southwest and, finally in a north-northeast-south-southwest direction. Furthermore, bedding faults preceded thrust faults. Differences between Pine Mountain sheet structures and those in the core may reflect local Chattanooga thickness variations or the absence of Chattanooga decollement structures.

Kulander, B.R.; Dean, S.L.; Kirr, J.; Feiler, J.

1987-09-01T23:59:59.000Z

297

Synthesis, Structure and bonding Analysis of the Polar Intermetallic Phase Ca2Pt2Cd  

SciTech Connect

The polar intermetallic phase Ca2Pt2Cd was discovered during explorations of the Ca-Pt-Cd system. The compound was synthesized by high temperature reactions, and its structure refined by single-crystal X-ray diffraction as orthorhombic, Immm, a = 4.4514(5), b = 5.8415(6), c = 8.5976(9) Å, Z = 2. The structure formally contains infinite, planar networks of [Pt2Cd]4– along the ab plane, which can be described as tessellation of six and four-member rings of the anions, with cations stuffed between the anion layers. The infinite condensed platinum chains show a substantial long–short distortion of 0.52 Å, an appreciable difference between Ca2Pt2Cd (26 valence electrons) and the isotypic but regular Ca2Cu2Ga (29 VE). The relatively large cation proportion diminishes the usual dominance of polar (Pt–Cd) and 5d–5d (Pt–Pt) contributions to the total Hamilton populations.

Samal, Saroj L.; Corbett, John D.

2012-08-14T23:59:59.000Z

298

Seismic Performance Evaluation of the Jacket Type Offshore Platforms through Incremental Dynamic Analysis considering Soil-Pile-Structure Interaction  

Science Conference Proceedings (OSTI)

Of great interest in Performance-Based Earthquake Engineering (PBEE) is the accurate estimation of the seismic performance of structures. A performance prediction and evaluation procedure is based on nonlinear dynamics and reliability theory. In this method, a full integration over the three key stochastic models is as follow: ground motion hazard curve, nonlinear dynamic displacement demand, and displacement capacity. Further, both epistemic and aleatory uncertainties are evaluated and carried through the analysis.In this paper, jacket and soil-pile system have been modeled using Finite Element program (OpenSees) and the incremental dynamic analysis (IDA) are performed to investigate nonlinear behavior of offshore platforms. The system demand is determined by performing time history response analyses of the jacket under a suite of FEMA/SAC uniform hazard ground motions. The system capacity in terms of the drift ratio against incipient collapse is generally difficult to predict since the structural response goes into nonlinear range before collapse. All the analyses are performed in two directions and the results are compared with each others. The confidence level of a jacket in each direction for a given hazard level is calculated using the procedure described.

Asgarian, Behrouz [K.N. Toosi University of Technology Tehran Iran (Iran, Islamic Republic of); Shokrgozar, Hamed R.; Talarposhti, Ali Shakeri [K.N. Toosi University of Technology, Tehran (Iran, Islamic Republic of)

2008-07-08T23:59:59.000Z

299

Structural and kinetic analysis of the unnatural fusion protein 4-coumaroyl-CoA ligase::stilbene synthase  

Science Conference Proceedings (OSTI)

To increase the biochemical efficiency of biosynthetic systems, metabolic engineers have explored different approaches for organizing enzymes, including the generation of unnatural fusion proteins. Previous work aimed at improving the biosynthesis of resveratrol, a stilbene associated a range of health-promoting activities, in yeast used an unnatural engineered fusion protein of Arabidopsis thaliana (thale cress) 4-coumaroyl-CoA ligase (At4CL1) and Vitis vinifera (grape) stilbene synthase (VvSTS) to increase resveratrol levels 15-fold relative to yeast expressing the individual enzymes. Here we present the crystallographic and biochemical analysis of the 4CL::STS fusion protein. Determination of the X-ray crystal structure of 4CL::STS provides the first molecular view of an artificial didomain adenylation/ketosynthase fusion protein. Comparison of the steady-state kinetic properties of At4CL1, VvSTS, and 4CL::STS demonstrates that the fusion protein improves catalytic efficiency of either reaction less than 3-fold. Structural and kinetic analysis suggests that colocalization of the two enzyme active sites within 70 {angstrom} of each other provides the basis for enhanced in vivo synthesis of resveratrol.

Wang, Yechun; Yi, Hankuil; Wang, Melissa; Yu, Oliver; Jez, Joseph M. (WU); (Danforth)

2012-10-24T23:59:59.000Z

300

Functional gene array-based analysis of microbial community structure in groundwaters with a gradient of contaminant levels  

Science Conference Proceedings (OSTI)

To understand how contaminants affect microbial community diversity, heterogeneity, and functional structure, six groundwater monitoring wells from the Field Research Center of the U.S. Department of Energy Environmental Remediation Science Program (ERSP; Oak Ridge, TN), with a wide range of pH, nitrate, and heavy metal contamination were investigated. DNA from the groundwater community was analyzed with a functional gene array containing 2006 probes to detect genes involved in metal resistance, sulfate reduction, organic contaminant degradation, and carbon and nitrogen cycling. Microbial diversity decreased in relation to the contamination levels of the wells. Highly contaminated wells had lower gene diversity but greater signal intensity than the pristine well. The microbial composition was heterogeneous, with 17-70% overlap between different wells. Metal-resistant and metal-reducing microorganisms were detected in both contaminated and pristine wells, suggesting the potential for successful bioremediation of metal-contaminated groundwaters. In addition, results of Mantel tests and canonical correspondence analysis indicate that nitrate, sulfate, pH, uranium, and technetium have a significant (p < 0.05) effect on microbial community structure. This study provides an overall picture of microbial community structure in contaminated environments with functional gene arrays by showing that diversity and heterogeneity can vary greatly in relation to contamination.

Waldron, P.J.; Wu, L.; Van Nostrand, J.D.; Schadt, C.W.; Watson, D.B.; Jardine, P.M.; Palumbo, A.V.; Hazen, T.C.; Zhou, J.

2009-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Automatic Table Ground Truth Generation and a Background-Analysis-Based Table Structure Extraction  

E-Print Network (OSTI)

In this paper, we first describe an automatic table ground truth generation system which can efficiently generate a large amount of accurate table ground truth suitable for the development of table detection algorithms. Then a novel background-analysis-based, coarse-to-fine table identification algorithm and an X-Y cut table decomposition algorithm are described. We discuss an experimental protocol to evaluate the table detection algorithms. For a total of having vin table entities and a total cell entities, our table detection algorithm takes line, word segmentation results as input and obtains around cell correct detection rates.

Yalin Wang; Ihsin T. Phillips; Robert Haralick

2001-01-01T23:59:59.000Z

302

Structural brain change in Attention Deficit Hyperactivity Disorder identified by meta-analysis  

E-Print Network (OSTI)

. American Psychiatric Association: Diagnostic and Statistical Manual of Mental Disorders 4th edition. Washington, DC: American Psychiatric Association; 1994. 2. Polanczyk G, de Lima MS, Horta BL, Biederman J, Rohde LA: The worldwide prevalence of ADHD: a... , 61:1361-9. 7. Ashburner J, Friston KJ: Voxel-based morphometry – the meth- ods. Neuroimage 2000, 11:805-21. 8. Laird AR, Fox PM, Price CJ, Glahn DC, Uecker AM, Lancaster JL, Tur- keltaub PE, Kochunov P, Fox PT: ALE meta-analysis: controlling...

Ellison-Wright, Ian; Ellison-Wright, Zoe; Bullmore, Ed

2008-06-30T23:59:59.000Z

303

Analysis of transverse Anderson localization in refractive index structures with customized random potential  

E-Print Network (OSTI)

We present a method to demonstrate Anderson localization in an optically induced randomized potential. By usage of computer controlled spatial light modulators, we are able to implement fully randomized nondiffracting beams of variable structural size in order to control the modulation length (photonic grain size) as well as the depth (disorder strength) of a random potential induced in a photorefractive crystal. In particular, we quantitatively analyze the localization length of light depending on these two parameters and find that they are crucial influencing factors on the propagation behavior leading to variably strong localization. Thus, we corroborate that transverse light localization in a random refractive index landscape strongly depends on the character of the potential, allowing for a flexible regulation of the localization strength by adapting the optical induction configuration.

Boguslawski, Martin; Armijo, Julien; Diebel, Falko; Rose, Patrick; Denz, Cornelia

2013-01-01T23:59:59.000Z

304

Computational Study and Analysis of Structural Imperfections in 1D and 2D Photonic Crystals  

SciTech Connect

Dielectric reflectors that are periodic in one or two dimensions, also known as 1D and 2D photonic crystals, have been widely studied for many potential applications due to the presence of wavelength-tunable photonic bandgaps. However, the unique optical behavior of photonic crystals is based on theoretical models of perfect analogues. Little is known about the practical effects of dielectric imperfections on their technologically useful optical properties. In order to address this issue, a finite-difference time-domain (FDTD) code is employed to study the effect of three specific dielectric imperfections in 1D and 2D photonic crystals. The first imperfection investigated is dielectric interfacial roughness in quarter-wave tuned 1D photonic crystals at normal incidence. This study reveals that the reflectivity of some roughened photonic crystal configurations can change up to 50% at the center of the bandgap for RMS roughness values around 20% of the characteristic periodicity of the crystal. However, this reflectivity change can be mitigated by increasing the index contrast and/or the number of bilayers in the crystal. In order to explain these results, the homogenization approximation, which is usually applied to single rough surfaces, is applied to the quarter-wave stacks. The results of the homogenization approximation match the FDTD results extremely well, suggesting that the main role of the roughness features is to grade the refractive index profile of the interfaces in the photonic crystal rather than diffusely scatter the incoming light. This result also implies that the amount of incoherent reflection from the roughened quarterwave stacks is extremely small. This is confirmed through direct extraction of the amount of incoherent power from the FDTD calculations. Further FDTD studies are done on the entire normal incidence bandgap of roughened 1D photonic crystals. These results reveal a narrowing and red-shifting of the normal incidence bandgap with increasing RMS roughness. Again, the homogenization approximation is able to predict these results. The problem of surface scratches on 1D photonic crystals is also addressed. Although the reflectivity decreases are lower in this study, up to a 15% change in reflectivity is observed in certain scratched photonic crystal structures. However, this reflectivity change can be significantly decreased by adding a low index protective coating to the surface of the photonic crystal. Again, application of homogenization theory to these structures confirms its predictive power for this type of imperfection as well. Additionally, the problem of a circular pores in 2D photonic crystals is investigated, showing that almost a 50% change in reflectivity can occur for some structures. Furthermore, this study reveals trends that are consistent with the 1D simulations: parameter changes that increase the absolute reflectivity of the photonic crystal will also increase its tolerance to structural imperfections. Finally, experimental reflectance spectra from roughened 1D photonic crystals are compared to the results predicted computationally in this thesis. Both the computed and experimental spectra correlate favorably, validating the findings presented herein.

K.R. Maskaly

2005-06-01T23:59:59.000Z

305

Blunt-crack band propagation in finite-element analysis for concrete structures. [LMFBR  

SciTech Connect

The knowledge of concrete fracture is needed in nuclear reactor safety. The question of safety arises from the potential of concrete to crack under thermal loading. It has been postulated that structural concrete could be exposed to very high temperature, which may result from hot reactor coolant or even core debris coming in direct contact with the concrete. The utilization of the blunt crack approach for simulating concrete cracking in a general-purpose code is explored. The difficulties encountered in establishing the proper direction of crack propagation in an arbitrary discretization are described. Crack propagation is considered within the context of two types of solution techniques: (1) implicit solution of the static crack advance, and (2) explicit time integration using a dynamic relaxation technique to simulate the static crack advance. Also, in both solution techniques an elastic model is used to characterize the concrete.

Pfeiffer, P.A.; Bazant, Z.P.; Marchertas, A.H.

1983-01-01T23:59:59.000Z

306

Structural Monitoring of a Weapons Test Unit Using Dynamic Signature Analysis  

SciTech Connect

A methodology to identify structural changes in weapon systems during environmental test is being developed at Lawrence Livermore National Laboratory. The method is coherence based and relies on comparing the 'dynamic signature' response of the test article before and after an environmental test or test series. Test caused changes in the dynamic signature get mapped to an image matrix where a color scale represents changes in sensor-to-sensor coherence. This methodology is convenient because an image can present large amounts of information in a very compact form and even subtle system changes may be identified. Furthermore, comparison of the dynamic signature response data 'before' and 'after' any test event can be made on a quasi-real time basis. This approach is particularly useful on large and/or complex test articles where many sensors are present and large volumes of data are generated.

Jensen, S; Malsbury, T; Leach, R; Tsap, L

2004-06-11T23:59:59.000Z

307

Stochastic Analysis of Waterhammer and Applications in Reliability-Based Structural Design for Hydro Turbine Penstocks  

Science Conference Proceedings (OSTI)

Abstract: The randomness of transient events, and the variability in factors which influence the magnitudes of resultant pressure fluctuations, ensures that waterhammer and surges in a pressurized pipe system are inherently stochastic. To bolster and improve reliability-based structural design, a stochastic model of transient pressures is developed for water conveyance systems in hydropower plants. The statistical characteristics and probability distributions of key factors in boundary conditions, initial states and hydraulic system parameters are analyzed based on a large record of observed data from hydro plants in China; and then the statistical characteristics and probability distributions of annual maximum waterhammer pressures are simulated using Monte Carlo method and verified by the analytical probabilistic model for a simplified pipe system. In addition, the characteristics (annual occurrence, sustaining period and probability distribution) of hydraulic loads for both steady and transient states are discussed. Illustrating with an example of penstock structural design, it is shown that the total waterhammer pressure should be split into two individual random variable loads: the steady/static pressure and the waterhammer pressure rise during transients; and that different partial load factors should be applied to each individual load to reflect its unique physical and stochastic features. Particularly, the normative load (usually the unfavorable value at 95-percentage point) for steady/static hydraulic pressure should be taken from the probability distribution of its maximum values during the pipe's design life, while for waterhammer pressure rise, as the second variable load, the probability distribution of its annual maximum values is used to determine its normative load.

Zhang, Qin Fen [ORNL; Karney, Professor Byran W. [University of Toronto; Suo, Prof. Lisheng [Hohai University, China; Colombo, Dr. Andrew [University of Toronto

2011-01-01T23:59:59.000Z

308

Structure Determination and Functional Analysis of a Chromate Reductase from Gluconacetobacter hansenii  

Science Conference Proceedings (OSTI)

Environmental protection through biological mechanisms that aid in the reductive immobilization of toxic metals (e.g.,chromate and uranyl) has been identified to involve specific NADH-dependent flavoproteins that promote cell viability. To understand the enzyme mechanisms responsible for metal reduction, the enzyme kinetics of a putative chromate reductasefrom Gluconacetobacter hansenii (Gh-ChrR) was measured and the crystal structure of the protein determined at 2.25 A°resolution. Gh-ChrR catalyzes the NADH-dependent reduction of chromate, ferricyanide, and uranyl anions under aerobic conditions. Kinetic measurements indicate that NADH acts as a substrate inhibitor; catalysis requires chromate binding prior to NADH association. The crystal structure of Gh-ChrR shows the protein is a homotetramer with one bound flavin mononucleotide (FMN) per subunit. A bound anion is visualized proximal to the FMN at the interface between adjacentsubunits within a cationic pocket, which is positioned at an optimal distance for hydride transfer. Site-directed substitutions of residues proposed to involve in both NADH and metal anion binding (N85A or R101A) result in 90–95% reductions in enzyme efficiencies for NADH-dependent chromate reduction. In comparison site-directed substitution of a residue (S118A) participating in the coordination of FMN in the active site results in only modest (50%) reductions in catalytic efficiencies, consistent with the presence of a multitude of side chains that position the FMN in the active site. The proposed proximity relationships between metal anion binding site and enzyme cofactors is discussed in terms of rational design principles for the use of enzymes in chromate and uranyl bioremediation.

Jin, Hongjun; Zhang, Yanfeng; Buchko, Garry W.; Varnum, Susan M.; Robinson, Howard; Squier, Thomas C.; Long, Philip E.

2012-08-06T23:59:59.000Z

309

Variance Analysis of Wind and Natural Gas Generation under Different Market Structures: Some Observations  

DOE Green Energy (OSTI)

Does large scale penetration of renewable generation such as wind and solar power pose economic and operational burdens on the electricity system? A number of studies have pointed to the potential benefits of renewable generation as a hedge against the volatility and potential escalation of fossil fuel prices. Research also suggests that the lack of correlation of renewable energy costs with fossil fuel prices means that adding large amounts of wind or solar generation may also reduce the volatility of system-wide electricity costs. Such variance reduction of system costs may be of significant value to consumers due to risk aversion. The analysis in this report recognizes that the potential value of risk mitigation associated with wind generation and natural gas generation may depend on whether one considers the consumer's perspective or the investor's perspective and whether the market is regulated or deregulated. We analyze the risk and return trade-offs for wind and natural gas generation for deregulated markets based on hourly prices and load over a 10-year period using historical data in the PJM Interconnection (PJM) from 1999 to 2008. Similar analysis is then simulated and evaluated for regulated markets under certain assumptions.

Bush, B.; Jenkin, T.; Lipowicz, D.; Arent, D. J.; Cooke, R.

2012-01-01T23:59:59.000Z

310

A New Kinematical Derivation of the Lorentz Transformation and the Particle Description of Light  

E-Print Network (OSTI)

The Lorentz Transformation is derived from only three simple postulates: (i) a weak kinematical form of the Special Relativity Principle that requires the equivalence of reciprocal space-time measurements by two different inertial observers; (ii) Uniqueness, that is the condition that the Lorentz Transformation should be a single valued function of its arguments; (iii) Spatial Isotropy. It is also shown that to derive the Lorentz Transformation for space-time points lying along a common axis, parallel to the relative velocity direction, of two inertial frames, postulates (i) and (ii) are sufficient. The kinematics of the Lorentz Transformation is then developed to demonstrate that, for consistency with Classical Electrodynamics, light must consist of massless (or almost massless) particles: photons.

J. H. Field

2004-10-27T23:59:59.000Z

311

Automated Kinematics Equations Generation and Constrained Motion Planning Resolution for Modular and Reconfigurable Robots  

SciTech Connect

Contrary to the repetitive tasks performed by industrial robots, the tasks in most DOE missions such as environmental restoration or Decontamination and Decommissioning (D&D) can be characterized as ''batches-of-one'', in which robots must be capable of adapting to changes in constraints, tools, environment, criteria and configuration. No commercially available robot control code is suitable for use with such widely varying conditions. In this talk we present our development of a ''generic code'' to allow real time (at loop rate) robot behavior adaptation to changes in task objectives, tools, number and type of constraints, modes of controls or kinematics configuration. We present the analytical framework underlying our approach and detail the design of its two major modules for the automatic generation of the kinematics equations when the robot configuration or tools change and for the motion planning under time-varying constraints. Sample problems illustrating the capabilities of the developed system are presented.

Pin, Francois G.; Love, Lonnie L.; Jung, David L.

2004-03-29T23:59:59.000Z

312

The effect of limb kinematics on the speed of a legged robot on granular media  

E-Print Network (OSTI)

Achieving effective locomotion on diverse terrestrial substrates can require subtle changes of limb kinematics. Biologically inspired legged robots (physical models of organisms) have shown impressive mobility on hard ground but suffer performance loss on unconsolidated granular materials like sand. Because comprehensive limb-ground interaction models are lacking, optimal gaits on complex yielding terrain have been determined empirically. To develop predictive models for legged devices and to provide hypotheses for biological locomotors, we systematically study the performance of SandBot, a small legged robot, on granular media as a function of gait parameters. High performance occurs only in a small region of parameter space. A previously introduced kinematic model of the robot combined with a new anisotropic granular penetration force law predicts the speed. Performance on granular media is maximized when gait parameters minimize body acceleration and limb interference, and utilize solidification features of granular media.

Chen Li; Paul B. Umbanhowar; Haldun Komsuoglu; Daniel I. Goldman

2013-03-29T23:59:59.000Z

313

Preliminary analysis of the induced structural radioactivity inventory of the base-case aqueous accelerator transmutation of waste reactor concept  

SciTech Connect

The purpose of the Los Alamos National Laboratory Accelerator Transmutation of (Nuclear) Waste (ATW) project is the substantial reduction in volume of long-lived high-level radioactive waste of the US in a safe and energy-efficient manner. An evaluation of the ATW concept has four aspects: material balance, energy balance, performance, and cost. An evaluation of the material balance compares the amount of long-lived high-level waste transmuted with the amount and type, of waste created in the process. One component of the material balance is the activation of structural materials over the lifetime of the transmutation reactor. A preliminary radioactivity and radioactive mass balance analysis has been performed on four structure regions of the reaction chamber: the tungsten target, the lead annulus, six tubing materials carrying the actinide slurry, and five reaction vessel structural materials. The amount of radioactive material remaining after a 100-yr cooling period for the base-case ATW was found to be 338 kg of radionuclides. The bulk of this material (313 kg) was generated in the zirconium-niobium (Zr-Nb) actinide tubing material. Replacement of the Zr-Nb tubing material with one of the alternative tubing materials analyzed would significantly reduce the short- and long-term radioactive mass produced. The alternative vessel material Al-6061 alloys, Tenelon, HT-9, and 2 1/4 Cr-1 Mo and the alternative actinide tubing materials Al-6061 alloy, carbon-carbon matrix, silicon carbide, and Ti-6 Al-4 V qualify for shallow land burial. Alternative disposal options for the base-case structural material Type 304L stainless steel and the actinide tubing material Zr-Nb will need to be considered as neither qualifies for shallow land burial.

Bezdecny, J.A.; Vance, K.M.; Henderson, D.L. [Univ. of Wisconsin, Madison, WI (United States). Dept. of Nuclear Engineering and Engineering Physics

1995-06-01T23:59:59.000Z

314

Dusky dolphins of Kaikoura, New Zealand: behavioral effects of genetic sampling and analysis of population structure  

E-Print Network (OSTI)

Seasonal differences in group size, behavior, icrographics. distribution, and coloration patterns of dusky dolphins (Lacenorhynchus obscures) in Kaikoura, New Zealand, have led researchers to question whether "winter'' and "summer'' groups are temporally and behaviorally segregated into genetically distinct populations. Exfoliated skin samples were collected in Kaikoura from July 1997 to May 1998 for genetic analysis of 40 "winter'' and 40 "summer'' individuals via skin swab. A 473 base pair section of the mitochondrion DNA control region was amplified and sequenced for the 80 samples. Nucleotide and haplotype diversity were 0.16 and 0.98, respectively. AMOVA and phylogenetie analyses indicate "winter'' and "summer'' groups are not subdivided with respect to maternal lineages. Lack of subdivision between seasonal populations is further supported by: (1) demographic patterns determined from mismatch distribution analysis suggest New Zealand dusky dolphins underwent a population expansion in the Pleistocene; (2) current levels of diversity suggest the long-term effective population size has been large', (3) preliminary analysis of photo-identification data indicate individuals are present in Kaikoura both winter and summer; (4) comparison of 80 samples from Kaikoura to eight beach-east samples from locations throughout New Zealand reveal shared haplotypes between regions. Behavioral responses to sampling were recorded for 315 contacts and 48 controls. The number of pro-and pest-contact joyriders and sample time were used as indicators of group-level response to sampling. The behavioral state of dolphins prior to sampling or time of day did not affect responses to sampling. Small groups were found to be more sensitive to sampling. Dolphin groups appeared to habituate to sampling activities after the first hour spent sampling. Responses to sampling were mild with 18% showing no response to contact. The most frequent response was to move right or left of the bow. Thirty-three percent of dolphins returned to the bow within 10.8 [] 0.73 seconds. There was no significant difference between proportion of responses between treatment and control groups, suggesting a proportion of responses to sampling can be explained by normal behavior in the presence of a vessel.

Harlin, April Dawn

1999-01-01T23:59:59.000Z

315

The Absolute Magnitude and Kinematics of RR Lyrae Stars via Statistical Parallax  

E-Print Network (OSTI)

We present new statistical parallax solutions for the absolute magnitude and kinematics of RR Lyrae stars. New proper motion, radial velocity, and abundance data are used; the new data set is 50% larger, and of higher quality, than previously available data sets. Based on an a priori kinematic study, we separate the stars into halo and thick disk sub-populations. Statistical parallax solutions on these sub-samples yield M_V(RR) = +0.71 +/- 0.12 at = -1.61 for the halo (162 stars), and M_V(RR) = +0.79 +/- 0.30 at = -0.76 for the thick disk (51 stars). The solutions yield kinematic parameters (solar motion and velocity ellipsoid) in good agreement with estimates of the halo and thick disk kinematics derived from both RR Lyrae stars and other stellar tracers. Monte Carlo simulations indicate that the solutions are accurate, and that the errors may be smaller than the estimates above. The simulations reveal a small bias in the disk solutions, and appropriate corrections are derived. The large uncertainty in the disk M_V(RR) prevents ascertaining the slope of the M_V(RR)-[Fe/H] relation. We find that (1) the distance to the Galactic Center is 7.6 +/- 0.4 kpc; (2) the mean age of the 17 oldest Galactic globular clusters is 16.5 _{-1.9}^{+2.1} Gyr; and (3) the distance modulus of the LMC is 18.28 +/- 0.13 mag. Estimates of H_0 which are based on an LMC distance modulus of 18.50 (e.g., Cepheid studies) increase by 10% if they are recalibrated to match our LMC distance modulus.

A. C. Layden; R. B. Hanson; S. L. Hawley; A. R. Klemola; C. J. Hanley

1996-08-16T23:59:59.000Z

316

Internal kinematics and stellar populations of early-type galaxies in the Fornax cluster  

E-Print Network (OSTI)

We present a study of the internal kinematics and stellar populations of early-type galaxies in the Fornax cluster based on integral-field spectroscopic observations with Gemini South GMOS and VLT-VIMOS. Seven galaxies in a luminosity range of -21.3 < M_B < -17.7 have been observed with these integral field units (IFU). As first results, velocity and line strength maps are presented for NGC 1427 and NGC 1419.

Bettina Gerken; Harald Kuntschner; Roger L. Davies

2005-10-07T23:59:59.000Z

317

Lightning location characteristics and vertical structure analysis of isolated storm cells in the TOGA COARE region  

E-Print Network (OSTI)

Previous studies have investigated the difference in structure between continental and oceanic storms, and tropical versus mid-latitude storms. This is the first study that has investigated the differences in vertical structure between lightning producing storm cells, and non-lightning producing cells over the tropical oceans. The characteristics of lightning locations with respect to radar reflectivity were also examined. Lightning characteristics of flashes associated with TOGA COARE storm cells were examined. One hundred fifty-three flashes were detected by three direction finders within the study area, a 150 kilometer circle around the Vickers research vessel. Radar reflectivities and reflectivity gradients were compared to flash counts. It was found that lightning flashes tended to occur in the convective region (the region enclosed by the 30 dBZ contour) with a peak at 37 dBZ, but avoiding the highest reflectivity values. Flashes often occurred in reflectivity gradients higher than 3 dBZ/km at 2 and 5 kilometers, which is the likely position of an updraft-downdraft interface. Isolated storm cells from four days during TOGA COARE were analyzed. Mean vertical profiles of radar reflectivity (VPRR) were constructed; these profiles were compared with other VPRRs from other tropical oceanic storms, and tropical and mid latitude continental storms. Reflectivity lapse rates were found to be effective in discriminating between lightning and non-lightning storms. A connection between the amount of lightning flashes and characteristics of VPRRs was examined. It was found that lightning and non-lightning storm cell VPRRs were associated with lower reflectivity lapse rates than ever previously been found for tropical oceanic storms. Reflectivity lapse rate of the mean profiles of lightning storm cells was 3.32 dBZ/km versus the 4.33 dBZ/km found for non-lightning storms. Lightning storms had reflectivity lapse rates similar to 3.5 dBZ/km lapse rate of tropical continental storms studied by Zipser and Lutz (I 994). Lapse rates of non-lightning cells significantly exceeded lapse rates from other cells in different tropical oceanic regimes.

Barnaby, Stephen Andrew

1995-01-01T23:59:59.000Z

318

P2P-based botnets: structural analysis, monitoring, and mitigation  

Science Conference Proceedings (OSTI)

Botnets, which are networks of compromised machines that are controlled by one or a group of attackers, have emerged as one of the most serious security threats on the Internet. With an army of bots at the scale of tens of thousands of hosts or even as large as 1.5 million PCs, the computational power of botnets can be leveraged to launch large-scale DDoS (Distributed Denial of Service) attacks, sending spamming emails, stealing identities and financial information, etc. As detection and mitigation techniques against botnets have been stepped up in recent years, attackers are also constantly improving their strategies to operate these botnets. The first generation of botnets typically employ IRC (Internet Relay Chat) channels as their command and control (C&C) centers. Though simple and easy to deploy, the centralized C&C mechanism of such botnets has made them prone to being detected and disabled. Against this backdrop, peer-to-peer (P2P) based botnets have emerged as a new generation of botnets which can conceal their C&C communication. Recently, P2P networks have emerged as a covert communication platform for malicious programs known as bots. As popular distributed systems, they allow bots to communicate easily while protecting the botmaster from being discovered. Existing work on P2P-based hotnets mainly focuses on measurement of botnet sizes. In this work, through simulation, we study extensively the structure of P2P networks running Kademlia, one of a few widely used P2P protocols in practice. Our simulation testbed incorporates the actual code of a real Kademlia client software to achieve great realism, and distributed event-driven simulation techniques to achieve high scalability. Using this testbed, we analyze the scaling, reachability, clustering, and centrality properties of P2P-based botnets from a graph-theoretical perspective. We further demonstrate experimentally and theoretically that monitoring bot activities in a P2P network is difficult, suggesting that the P2P mechanism indeed helps botnets hide their communication effectively. Finally, we evaluate the effectiveness of some potential mitigation techniques, such as content poisoning, Sybil-based and Eclipse-based mitigation. Conclusions drawn from this work shed light on the structure of P2P botnets, how to monitor bot activities in P2P networks, and how to mitigate botnet operations effectively.

Yan, Guanhua [Los Alamos National Laboratory; Eidenbenz, Stephan [Los Alamos National Laboratory; Ha, Duc T [UNIV AT BUFFALO; Ngo, Hung Q [UNIV AT BUFFALO

2008-01-01T23:59:59.000Z

319

Kinetic and Structural Analysis of Substrate Specificity in Two Copper Amine Oxidases from Hansenula polymorpha  

SciTech Connect

The structural underpinnings of enzyme substrate specificity are investigated in a pair of copper amine oxidases (CAOs) from Hansenula polymorpha (HPAO-1 and HPAO-2). The X-ray crystal structure (to 2.0 {angstrom} resolution) and steady state kinetic data of the second copper amine oxidase (HPAO-2) are presented for comparison to those of HPAO-1. Despite 34% sequence identity and superimposable active site residues implicated in catalysis, the enzymes vary considerably in their substrate entry channel. The previously studied CAO, HPAO-1, has a narrow substrate channel. In contrast, HPAO-2 has a wide funnel-shaped substrate channel, which also contains a side chamber. In addition, there are a number of amino acid changes within the channels of HPAO-2 and HPAO-1 that may sterically impact the ability of substrates to form covalent Schiff base catalytic intermediates and to initiate chemistry. These differences can partially explain the greatly different substrate specificities as characterized by k{sub cat}/K{sub m} value differences. In HPAO-1, the k{sub cat}/K{sub m} for methylamine is 330-fold greater than for benzylamine, whereas in HPAO-2, it is benzylamine that is the better substrate by 750-fold. In HPAO-2, an inflated {sup D}k{sub cat}/K{sub m}(methylamine) in relation to {sup D}k{sub cat}/K{sub m}(benzylamine) indicates that proton abstraction has been impeded more than substrate release. In HPAO-1, {sup D}k{sub cat}/K{sub m}(S) changes little with the slow substrate and indicates a similar increase in the energy barriers that control both substrate binding and subsequent catalysis. In neither case is k{sub cat}/K{sub m} for the second substrate, O{sub 2}, significantly altered. These results reinforce the modular nature of the active sites of CAOs and show that multiple factors contribute to substrate specificity and catalytic efficiency. In HPAO-1, the enzyme with the smaller substrate binding pocket, both initial substrate binding and proton loss are affected by an increase in substrate size, while in HPAO-2, the enzyme with the larger substrate binding pocket, the rate of proton loss is differentially affected when a phenyl substituent in the substrate is reduced to the size of a methyl group.

Chang, Cindy M.; Klema, Valerie J.; Johnson, Bryan J.; Mure, Minae; Klinman, Judith P.; Wilmot, Carrie M. (UCB); (Kansas); (UMM)

2010-04-26T23:59:59.000Z

320

Nano-Hydroxyapatite/Fluoridated and Unfluoridated Bioactive Glass Composites: Structural Analysis and Bioactivity Evaluation  

Science Conference Proceedings (OSTI)

Biphasic bioceramic composites containing nano-hydroxyapatite (HAP) and nanosized bioactive glasses have been prepared in the form of pellets and have been examined for the effects of bioglass concentrations and sintering temperature on the structural transformations and bioactivity behavior. Pure stoichiometric nano-HAP was synthesized using sol-gel technique. Two bioglasses synthesized in this work--fluoridated bioglass (Cao-P{sub 2}O{sub 5}-Na{sub 2}O{sub 3}-CaF{sub 2}) and unfluoridated bioglass (Cao-P{sub 2}O{sub 5}-Na{sub 2}O{sub 3}) designated as FBG and UFBG respectively, were added to nano-HAP with concentrations of 5, 10, 12 and 15%. The average particle sizes of synthesized HAP and bioglasses were 23 nm and 35 nm, respectively. The pellets were sintered at four different temperatures i.e. 1000 deg. C, 1150 deg. C, 1250 deg. C and 1350 deg. C. The investigations involved study of structural and bioactivity behavior of green and sintered pellets and their deviations from original materials i.e. HAP, FBG and UFBG, using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The phase composition of the sintered pellets was found to be non-stoichiometric HAP with {alpha}-TCP (tricalcium phosphate) and {beta}-TCP. It was revealed from SEM images that bonding mechanism was mainly solid state sintering for all pellets sintered at 1000 deg. C and 1150 deg. C and also for pellets with lower concentrations of bioglass i.e. 5% and 10% sintered at 1250 deg. C. Partly liquid phase sintering was observed for pellets with higher bioglass concentrations of 12% and 15% sintered at 1250 deg. C and same behaviour was noted for pellets at all concentrations of bioglasses at 1350 deg. C. The sintered density, hardness and compression strength of pellets have been influenced both by the concentration of the bioglasses and sintering temperature. It was observed that the biological HAP layer formation was faster on the green pellets surface than on pure HAP and sintered pellets, showing higher bioactivity in the green pellets.

Batra, Uma [Department of Materials and Metallurgical Engineering, PEC University of Technology, Chandigarh-160012 (India); Kapoor, Seema [University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh-160014 (India); Sharma, J. D. [Department of Materials and Metallurgical Engineering, PEC University of Technology, Chandigarh (India)

2011-12-12T23:59:59.000Z

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321

Observations of the Dynamics and Kinematics of the Atmospheric Surface Layer on the Ross Ice Shelf, Antarctica  

Science Conference Proceedings (OSTI)

Row Island, Antarctica with its 3000 m volcanic peaks a prodigious barrier to the predominant southerly airflow of the western Ross Ice Shelf, Antarctica. This study investigates the relationship of Ross Island to the dynamics and kinematics of ...

Hugh Richard Slotten; Charles R. Stearns

1987-12-01T23:59:59.000Z

322

Investigations of a Winter Mountain Storm in Utah. Part I: Synoptic Analyses, Mesoscale Kinematics, and Water Release Rates  

Science Conference Proceedings (OSTI)

A winter storm passing across the north–south-orientated Tushar Mountains in southwest Utah is investigated in this multipart paper. This Part I describes the evolving synoptic pattern, mesoscale kinematics, and calculated water release rates (...

Alexis B. Long; Arlen W. Huggins; Bernard A. Campistron

1990-06-01T23:59:59.000Z

323

Orographic Modification of Convection and Flow Kinematics by the Oregon Coast Range and Cascades during IMPROVE-2  

Science Conference Proceedings (OSTI)

This paper describes the kinematic and precipitation evolution accompanying the passage of a cold baroclinic trough over the Central Oregon Coast Range and Cascades during 4–5 December 2001 of the second Improvement of Microphysical ...

Brian A. Colle; Yanluan Lin; Socorro Medina; Bradley F. Smull

2008-10-01T23:59:59.000Z

324

A Fuzzy Logic Method for Lightning Prediction Using Thermodynamic and Kinematic Parameters from Radio Sounding Observations in South Korea  

Science Conference Proceedings (OSTI)

Lightning is one of the most troubling weather phenomena for weather forecasters at space centers. In this study, proximity sounding and lightning data were used to evaluate the utility of thermodynamic and kinematic parameters for forecasting ...

Bongjae Kuk; Hongil Kim; Jongsung Ha; Hyokeun Lee; Gyuwon Lee

2012-02-01T23:59:59.000Z

325

Testing and analysis of structural integrity of electrosleeved tubes under severe accident transients  

Science Conference Proceedings (OSTI)

The structural integrity of flawed steam generator tubing with Electrosleeves{trademark} under simulated severe accident transients was analyzed by analytical models that used available material properties data and results from high-temperature tests conducted on Electrosleeved tubes. The Electrosleeve material is almost pure Ni and derives its strength and other useful properties from its nanocrystalline microstructure, which is stable at reactor operating temperatures. However, it undergoes rapid grain growth, at the high temperatures expected during severe accidents, resulting in a loss of strength and a corresponding decrease in flow stress. The magnitude of this decrease depends on the time-temperature history during the accident. Failure tests were conducted at ANL and FTI on internally pressurized Electrosleeved tubes with 80% and 100% throughwall machined axial notches in tie parent tubes that were subjected to simulated severe accident temperature transients. The test results, together with the analytical model, were used to estimate the unaged flow stress curve of the Electrosleeved material at high temperatures. Failure temperatures for Electrosleeved tubes with throughwall and part-throughwall axial cracks of various lengths in the parent tubes were calculated for a postulated severe accident transient.

Majumdar, S.

1999-12-10T23:59:59.000Z

326

Analysis of customer response to electricity rate structures which create an endogenous electricity price  

SciTech Connect

In the 1970's, concern over the availability and cost of fossil fuels led to use of electricity rates designed to conserve energy. Under several rates the marginal electricity price was endogenous. Two such rates were inverted block rates and voluntary time-of-use (TOU) rates. Both rates have the potential to alter welfare by changing electricity-usage patterns. Both require special methodological treatment. The problem of modeling demand under block rates was addressed in several fields. The most-sophisticated solution to date is a maximum likelihood approach first used in labor economics. However, as demonstrated in this thesis, this approach may cause misspecification of the likelihood function. In this thesis, a correctly specified maximum-likelihood model is developed, in which the simultaneous determination of usage and the marginal price resulting from the block rate are explicitly modeled in a unified framework. The resulting likelihood function is not continuously differentiable. However, maximization of this likelihood function is shown to produce asymptotically normal parameter estimates. The model is used to estimate the demand for electricity under a two-tier inverted block rate. Results show very small elasticities of demand with respect to each component of the rate structure. Comparison estimates using other methodologies demonstrate the problems which can arise if the endogenous price is not carefully treated.

Kuester, K.A.

1986-01-01T23:59:59.000Z

327

A Model of Multiple Zonal Jets in the Oceans: Dynamical and Kinematical Analysis  

Science Conference Proceedings (OSTI)

Multiple alternating zonal jets observed in the ocean are studied with an idealized quasigeostrophic zonal-channel model, with the supercritical, zonal background flow imposed. Both eastward and westward background flows with vertical shear are ...

P. Berloff; I. Kamenkovich; J. Pedlosky

2009-11-01T23:59:59.000Z

328

Bayesian analysis to identify very low-mass members of nearby young stellar kinematic groups  

E-Print Network (OSTI)

We describe our all-sky survey for >M4 candidate members to nearby, young associations from the 2MASS and WISE catalogs using bayesian inference. We report the first results, including 38 highly probable candidates showing spectroscopic signs of low-gravity (and thus youth). The latest of these objects would correspond to a 11 - 13 MJup object, around the limit of the planetary regime.

Gagné, Jonathan; Doyon, René; Malo, Lison; Faherty, Jacqueline; Artigau, Étienne

2013-01-01T23:59:59.000Z

329

A Numerical Analysis of a Kinematic Stirling-Cycle Beat Pump for Space Conditioning Applications*  

E-Print Network (OSTI)

, and flywheel energy storage system experience Concentrating Solar Power: Stirling engines Compact Rankine design for power tower or field collector systems Phase change materials for Stirling engine integration Advanced composite materials - Concurrent engineering approach - Process optimization - NDI, repair - Full

Oak Ridge National Laboratory

330

Fragility Analysis Methodology for Degraded Structures and Passive Components in Nuclear Power Plants - Illustrated using a Condensate Storage Tank  

SciTech Connect

The Korea Atomic Energy Research Institute (KAERI) is conducting a five-year research project to develop a realistic seismic risk evaluation system which includes the consideration of aging of structures and components in nuclear power plants (NPPs). The KAERI research project includes three specific areas that are essential to seismic probabilistic risk assessment (PRA): (1) probabilistic seismic hazard analysis, (2) seismic fragility analysis including the effects of aging, and (3) a plant seismic risk analysis. Since 2007, Brookhaven National Laboratory (BNL) has entered into a collaboration agreement with KAERI to support its development of seismic capability evaluation technology for degraded structures and components. The collaborative research effort is intended to continue over a five year period. The goal of this collaboration endeavor is to assist KAERI to develop seismic fragility analysis methods that consider the potential effects of age-related degradation of structures, systems, and components (SSCs). The research results of this multi-year collaboration will be utilized as input to seismic PRAs. In the Year 1 scope of work, BNL collected and reviewed degradation occurrences in US NPPs and identified important aging characteristics needed for the seismic capability evaluations. This information is presented in the Annual Report for the Year 1 Task, identified as BNL Report-81741-2008 and also designated as KAERI/RR-2931/2008. The report presents results of the statistical and trending analysis of this data and compares the results to prior aging studies. In addition, the report provides a description of U.S. current regulatory requirements, regulatory guidance documents, generic communications, industry standards and guidance, and past research related to aging degradation of SSCs. In the Year 2 scope of work, BNL carried out a research effort to identify and assess degradation models for the long-term behavior of dominant materials that are determined to be risk significant to NPPs. Multiple models have been identified for concrete, carbon and low-alloy steel, and stainless steel. These models are documented in the Annual Report for the Year 2 Task, identified as BNL Report-82249-2009 and also designated as KAERI/TR-3757/2009. This report describes the research effort performed by BNL for the Year 3 scope of work. The objective is for BNL to develop the seismic fragility capacity for a condensate storage tank with various degradation scenarios. The conservative deterministic failure margin method has been utilized for the undegraded case and has been modified to accommodate the degraded cases. A total of five seismic fragility analysis cases have been described: (1) undegraded case, (2) degraded stainless tank shell, (3) degraded anchor bolts, (4) anchorage concrete cracking, and (5)a perfect combination of the three degradation scenarios. Insights from these fragility analyses are also presented.

Nie, J.; Braverman, J.; Hofmayer, C.; Choun, Y.; Kim, M.; Choi, I.

2010-06-30T23:59:59.000Z

331

A supply forecasting model for Zimbabwe's corn sector: a time series and structural analysis  

E-Print Network (OSTI)

The Zimbabwean government utilizes the corn supply forecasts to establish producer prices for the following growing season, estimate corn storage and handling costs, project corn import needs and associated costs, and to assess the Grain Marketing Board's financial resource needs. Thus, the corn supply forecasts are important information used by the government for contingency planning, decision-making, policy-formulation and implementation. As such, the need for accurate forecasts is obvious. The objectives of the study are: (a) determine how changes in the government-established producer price affects the quantity of corn supplied to the Grain Marketing Board by the large-scale corn-producing sector and (b) whether including rainfall or rainfall probabilities into econometric models would result in an improvement of corn supply forecasts compared to current forecasts by the government. In order to accomplish the first objective a supply elasticity model was specified and estimated using ordinary least squares. This model is intended to provide 'de insight to the government regarding the influence of the government-established corn price and other related variables on corn supplied to the Grain Marketing Board by the large-scale producers. Thus, the estimated model would be useful to the government when establishing corn prices in March/April for production in the following growing season (October - February). To achieve the second objective, preliminary analysis was carried out to verify whether there is statistical evidence to support the hypothesis that rainfall cause" corn production and supply, and also corn prices and sales. Specifically the preliminary analysis involved using the Granger causality tests, stationarity tests and innovation accounting (impulse responses and forecast error decomposition). Having verified and quantified the causal effects of rainfall on corn production and supply, the next task was to investigate whether including rainfall and/or drought probabilities into forecasting econometric models would help provide improved out-of-sample forecasts compared to the government's forecasts. The forecasting accuracy of the models (short-run) was evaluated using standard statistical measures such as, the mean square error (MSE), mean absolute percentage error (MAPEI), improved mean absolute percentage error (IMAPE) and Theil's U-statistic, and thereupon select the best model. The results indicated that by incorporating rainfall and/or rainfall probabilities into econometric forecasting models, there was substantial improvement in corn supply forecasts. It follows that the the government would likely find it beneficial to incorporate the rainfall variable into their forecasting effort.

Makaudze, Ephias

1993-01-01T23:59:59.000Z

332

Analysis of the structure and mechanisms of extinction of a counterflow methanol-air diffusion flame  

SciTech Connect

Numerical calculations were performed to determine the structure and to clarify the extinction mechanisms of diffusion flames stabilized between counterflowing streams of methanol and air. The calculations were performed at a value of the thermodynamic pressure equal to 1 atmosphere, with different values for the rate of strain and with two different chemical kinetic mechanisms, mechanism a and mechanism b. Mechanism a and mechanism b have the same set of elementary reactions, but the rate constants for these elementary reactions were obtained from two different references. If mechanism a is used, the authors conclude that at low rates of strain the concentration of CH/sub 2/OH and HCO are in steady state and, if partial equilibrium is assumed for certain reactions, there exist algebraic relations among the concentrations of the radicals OH, H, and O. As the rate of strain is increased, HCO is no longer in steady state and no solution was obtained for a strain rate greater than 521 s/sup -1/. However, if mechanism b is used, the concentration of HCO alone is in steady state, and there also exist algebraic relations among the concentrations of the radicals OH, H, and O. As the rate of strain is increased, no solution was obtained for a strain rate greater than 168 s/sup -1/, and the authors speculate that extinction of the flame is due to a large value of the activation energy for a reaction controlling the pyrolysis of CH/sub 2/OH to CH/sub 2/O.

Seshadri, K.; Trevino, C.; Smooke, M.D.

1989-05-01T23:59:59.000Z

333

Rural electric cooperatives and the cost structure of the electric power industry: A multiproduct analysis  

SciTech Connect

Since 1935, the federal government of the United States has administered a program designed to make electricity available to rural Americans. This dissertation traces the history of the rural electrification program, as well as its costs. While the Congress intended to simply provide help in building the capital structure of rural electric distribution systems, the program continues to flourish some 35 years after these systems first fully covered the countryside. Once the rural distribution systems were built, the government began to provide cooperatives with billions of dollars in subsidized loans for the generation of electric power. Although this program costs the taxpayers nearly $1 billion per year, no one has ever tested its efficacy. The coops' owner/members do not have the right to trade their individual ownership shares. The RECs do not fully exploit the scale and scope economies observed in the investor-owned sector of this industry. This dissertation compares the relative productive efficiencies of the RECs and the investor-owned electric utilities (IOUs) in the United States. Using multiproduct translog cost functions, the estimated costs of cooperatives are compared to those of IOUs in providing identical output bundles. Three separate products are considered as outputs: (1) wholesale power; (2) power sold to large industrial customers; and (3) power sold to residential and commercial customers. It is estimated that, were the RECs forced to pay market prices for their inputs, their costs would exceed those incurred by the IOUs by about 24 percent. Several policy recommendations are made: (1) the RECs should be converted to stockholder-owned, tax-paying corporations; (2) the government should discontinue its subsidized loan program; (3) the government should sell its hydroelectric power at market prices, nullifying the current preference given to cooperatives and municipal distributors in the purchase of this currently underpriced power.

Berry, D.M.

1992-01-01T23:59:59.000Z

334

Chemical and structural analysis of the Large Magellanic Cloud using the fundamental mode RR Lyrae stars  

E-Print Network (OSTI)

We present a careful and detailed light curve analysis of publicly available $I$-band data on fundamental mode RR Lyrae (RRab) stars of the Large Magellanic Cloud (LMC) obtained by the Optical Gravitational Lensing Experiment (OGLE) phase-III project. Using the Fourier parameters of $13,095$ RRab stars, metallicities and absolute magnitudes of individual stars are obtained. The representation of stars on the $P-\\phi_{31}^{V}$ plane shows the existence of three significant metallicity groups with mean metallicities as $-1.20 \\pm 0.12$ dex, $-1.57 \\pm 0.10$ dex and $-1.89 \\pm 0.09$ dex. The corresponding absolute magnitudes of these three groups are obtained as $0.70\\pm 0.08$ mag, $0.59 \\pm 0.06$ mag and $0.49 \\pm 0.08$ mag, respectively. Distribution of these three groups as a function of vertical $|z|$ distance indicates that the formation of the LMC disk predates the formation of the inner halo. Issue of the existence of a metallicity gradient as a function of galactocentric distances has also been addressed...

Deb, Sukanta

2013-01-01T23:59:59.000Z

335

Measurement of joint kinematics using a conventional clinical single-perspective flat-panel radiography system  

SciTech Connect

Purpose: The ability to accurately measure joint kinematics is an important tool in studying both normal joint function and pathologies associated with injury and disease. The purpose of this study is to evaluate the efficacy, accuracy, precision, and clinical safety of measuring 3D joint motion using a conventional flat-panel radiography system prior to its application in an in vivo study. Methods: An automated, image-based tracking algorithm was implemented to measure the three-dimensional pose of a sparse object from a two-dimensional radiographic projection. The algorithm was tested to determine its efficiency and failure rate, defined as the number of image frames where automated tracking failed, or required user intervention. The accuracy and precision of measuring three-dimensional motion were assessed using a robotic controlled, tibiofemoral knee phantom programmed to mimic a subject with a total knee replacement performing a stair ascent activity. Accuracy was assessed by comparing the measurements of the single-plane radiographic tracking technique to those of an optical tracking system, and quantified by the measurement discrepancy between the two systems using the Bland-Altman technique. Precision was assessed through a series of repeated measurements of the tibiofemoral kinematics, and was quantified using the across-trial deviations of the repeated kinematic measurements. The safety of the imaging procedure was assessed by measuring the effective dose of ionizing radiation associated with the x-ray exposures, and analyzing its relative risk to a human subject. Results: The automated tracking algorithm displayed a failure rate of 2% and achieved an average computational throughput of 8 image frames/s. Mean differences between the radiographic and optical measurements for translations and rotations were less than 0.08 mm and 0.07 Degree-Sign in-plane, and 0.24 mm and 0.6 Degree-Sign out-of-plane. The repeatability of kinematics measurements performed using the radiographic tracking technique was better than {+-}0.09 mm and 0.12 Degree-Sign in-plane, and {+-}0.70 mm and {+-}0.07 Degree-Sign out-of-plane. The effective dose associated with the imaging protocol used was 15 {mu}Sv for 10 s of radiographic cine acquisition. Conclusions: This study demonstrates the ability to accurately measure knee-joint kinematics using a single-plane radiographic measurement technique. The measurement technique can be easily implemented at most clinical centers equipped with a modern-day radiographic x-ray system. The dose of ionizing radiation associated with the image acquisition represents a minimal risk to any subjects undergoing the examination.

Seslija, Petar; Teeter, Matthew G.; Yuan Xunhua; Naudie, Douglas D. R.; Bourne, Robert B.; MacDonald, Steven J.; Peters, Terry M.; Holdsworth, David W. [Biomedical Engineering Graduate Program, University of Western Ontario, London, Ontario N6A 5B9 (Canada) and Imaging Research Laboratories, Robarts Research Institute, London, Ontario N6A 5K8 (Canada); Department of Medical Biophysics, University of Western Ontario, London, Ontario N6A 5C1 (Canada) and Imaging Research Laboratories, Robarts Research Institute, London, Ontario N6A 5K8 (Canada); Imaging Research Laboratories, Robarts Research Institute, London, Ontario N6A 5K8 (Canada) and Division of Orthopaedic Surgery, University of Western Ontario and London Health Sciences Centre, London, Ontario N6A 4L6 (Canada); Division of Orthopaedic Surgery, University of Western Ontario and London Health Sciences Centre, London, Ontario N6A 4L6 (Canada); Biomedical Engineering Graduate Program, University of Western Ontario, London, Ontario N6A 5B9 (Canada); Department of Medical Biophysics, University of Western Ontario, London, Ontario N6A 5C1 (Canada) and Imaging Research Laboratories, Robarts Research Institute, London, Ontario N6A 5K8 (Canada)

2012-10-15T23:59:59.000Z

336

Award Review Analysis of Food Allergen Structures and Development of Foods for Allergic Patients  

E-Print Network (OSTI)

Food allergy is one of the important health problems, and countermeasures are socially required. We have been undertaking studies on wheat allergens and their epitopes, and have developed a method for producing hypoallergenic wheat flour by enzymatic modification. The hypoallergenic products are now provided to patients. More noteworthy, by taking hypoallergenic cupcakes over a long period, more than half of patients are hyposensitized and become able to eat normal wheat products. This suggests that the hypoallergenic wheat flour can act as anti-allergenic via allergen-specific immunotolerance. This series of studies was followed by expansive research on food allergy: analysis of epitopes of bovine serum albumin (the major beef allergen), isolation and identification of inhibitory peptides for allergen absorption at the intestine, evaluation of hesperetin as an inhibitor of degranulation of mast cells, and the development of PCR detection methods for verifying allergen labeling and for identifying hidden allergic ingredients in processed foods. Key words: food allergy; epitope; hypoallergenic wheat flour; allergen permeation; Caco-2 The worldwide prevalence of allergic diseases such as asthma, atopic dermatitis, and allergic rhinitis has increased during the last two decades, 1) and it is assumed that in Japan more than one-third of the population is now suffering from at least one of these diseases. Allergic diseases affect atopic individuals, who synthesize specific Immunoglobulins E (IgE) to environmental allergens. These allergens include grass and tree pollens, indoor allergens such as house dust mites and animal dander, and various foods. Hen’s egg, 2) cow’s milk, 3) wheat 4) and peanuts 5) are generally known allergens for food-allergic patients. Allergens are proteins characterized by their ability to induce a pathogenic IgE response in susceptible individuals, giving rise to asthma, atopic dermatitis, and rhinitis. Although the reasons that certain individuals suffer particular hypersensitivities are unclear, there is evidence that both genetic and environmental factors influence susceptibility. 6)

Soichi Tanabe

2008-01-01T23:59:59.000Z

337

Structure and Evolution of the 22 February 1993 TOGA COARE Squall Line: Aircraft Observations of Precipitation, Circulation, and Surface Energy Fluxes  

Science Conference Proceedings (OSTI)

This study documents the precipitation and kinematic structure of a mature, eastward propagating, oceanic squall line system observed by instrumented aircraft during the Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response ...

David P. Jorgensen; Margaret A. LeMone; Stanley B. Trier

1997-08-01T23:59:59.000Z

338

Structural analysis and evaluation of a mixer pump in a double-shell tank at the Hanford Site  

DOE Green Energy (OSTI)

The double-shell waste tank 241-SY-101 is a 1,000,000 gallon tank used to store radioactive waste at the Hanford Site near Richland, Washington. With time the waste has formed two layers of sludge, a convective and a nonconvective layer. In addition, a crest has formed over the surface of the waste, isolating the convective layer from the vapor space. Ongoing reactions in the waste cause a buildup of hydrogen molecules that become trapped within the nonconvective layer and under the crust. Over time, this hydrogen buildup increases pressure on the crest from beneath. Every 100 to 140 days, the pressure is released when the crust lifts upward in what is called a waste rollover. To prevent the release of a large volume of hydrogen to the vapor space, a mixer pump has been designed to be installed in the tank to circulate the waste and reduce or prevent the hydrogen buildup. The structural analysis and evaluation designed as part of the hydrogen mitigation test process and presented herein addresses the response of the mixer pump and the tank dome resulting from expected operational and design loads. The loads include deadweight, waste rollover, asymmetric thrust, and pump vibration, as well as seismic loads. The seismically induced loads take into consideration both the convective and the impulsive effects of the waste-filled tank. The structural evaluations were performed in accordance with applicable national codes and standards. The qualification of the mixer pump required the design of a unique mounting assembly to transfer the loads from the pump to the surrounding soil without overstressing the structural components such as the dome penetration riser. Also, special consideration was given to minimize the additional stresses in the already stressed concrete tank dome.

Rezvani, M.A.; Strehlow, J.P. [Westinghouse Hanford Co., Richland, WA (United States); Baliga, R. [ADVENT Engineering Services, Inc., San Ramon, CA (United States)

1993-08-01T23:59:59.000Z

339

Analysis of Glass Breakage  

Science Conference Proceedings (OSTI)

Analysis of a Bucketwheel Stacker Reclaimer Structural Failure · Analysis of Glass Breakage · Analysis of Sealed, Integrated, Automotive Wheel Bearings.

340

Slow motion responses of compliant offshore structures  

E-Print Network (OSTI)

An efficient method is developed to predict slow motion responses of slender compliant offshore structures in the unidirectional irregular waves and currents. The environmental loads are computed using the modified Morison equation based on slender-body approximation. The Hybrid Wave Model, which considers the nonlinear wave-wave interactions, is used to predict wave kinematics accurately up to the second order of wave steepness. Other second-order forces due to convective acceleration, free-surface fluctuation, time-varying structural displacement and axial divergence effects are also included. An iterative-incremental Newmark-,3 scheme is employed to simulate the structural responses in the time domain. It is observed that the predicted slow-drift motions of a Joint, Industry Project Spar and a Floating Jacket Platform are in excellent agreement with the model test measurements. However, the predicted slow-drift motions using Wheeler Stretching and Linear Extrapolation wave kinematics models do not agree with the measurements well.

Cao, Peimin

1996-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
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341

Observations of the Sea-Breeze Front during CaPE. Part II: Dual-Doppler and Aircraft Analysis  

Science Conference Proceedings (OSTI)

The three-dimensional kinematic structures of offshore and onshore flow sea-breeze fronts observed during the CaPE experiment are shown using high resolution dual-Doppler and aircraft data. The fronts interact with horizontal convective rolls (...

Nolan T. Atkins; Roger M. Wakimoto; Tammy M. Weckwerth

1995-04-01T23:59:59.000Z

342

Application of optical remote sensing to the measurment of wave surface kinematics  

E-Print Network (OSTI)

This research study focused on the development and application of a laboratory instrument utilizing real-time video in conjunction with image processing techniques to accurately measure 3-dimensional wave surface kinematics. This thesis presents the design and results of the instrument in its initial, 2-dimensional measurement, stage of development. The objective was to design a functioning laboratory instrument and use it to measure horizontal surface velocities on a series of waves. These results are compared to those of existing theoretical methods to determine both the accuracy and feasibility of the instrument. Measurement of horizontal surface velocities are conducted on a series of regular and irregular waves. Results of the regular wave measurements are compared to well established higher order wave theory to quantify the accuracy of the laboratory instrument. The results of the irregular wave measurements are compared to predicted velocity time series acquired from the Hybrid Wave Model, Wheeler Stretching and Linear Extrapolation. Adjustments are then made to the measured velocity time series to represent any drift currents that might be present in the flume that theory can not predict. Comparison of the adjusted time series are then made to those predicted by the three theoretical methods. Maximum and Minimum measured velocities for each wave set are also compared to predicted values. Comparisons between measured and theoretical values show that the instrument and the theoretical models are in agreement and thus the laboratory instrument is a capable means of accurately measuring wave surface kinematics. Results also show that considering the agreement between theory and measured values, when taking into account the excessive amount time required to produce velocities from the video images, the instrument, in its current form, is not a practical method for surface kinematic measurements. There is, however, enough evidence to show that expanding the instrument to include 3-dimensional measurement capabilities would produce a valuable laboratory tool.

Riedl, Stephen James

1994-01-01T23:59:59.000Z

343

Hybridized enriched space-time finite element method for analysis of thin-walled structures immersed in generalized Newtonian fluids  

Science Conference Proceedings (OSTI)

The paper addresses the numerical treatment of a specific class of fluid-structure interaction problems: flow-immersed thin structures undergoing considerable motion and deformation. The simultaneous solution procedure uses a mixed-hybrid velocity-based ... Keywords: Embedded thin structure, Enriched space-time approximation, Fluid-structure interaction, Strong coupling

A. Zilian; H. Netuzhylov

2010-11-01T23:59:59.000Z

344

Kinematic Stirling engine as an energy conversion subsystem for paraboloidal dish solar thermal power plants  

DOE Green Energy (OSTI)

The potential of a suitably designed and economically manufactured Stirling engine as the energy conversion subsystem of a paraboloidal dish-Stirling solar thermal power module has been estimated. Results obtained by elementary cycle analyses have been shown to match quite well the performance characteristics of an advanced kinematic Stirling engine, the United Stirling P-40, as established by current prototypes of the engine and by a more sophisticated analytic model of its advanced derivative. In addition to performance, brief consideration has been given to other Stirling engine criteria such as durability, reliability, and serviceability. Production costs have not been considered here.

Bowyer, J.M.

1984-04-15T23:59:59.000Z

345

Transverse masses and kinematic constraints: from the boundary to the crease  

E-Print Network (OSTI)

work by Cheng and Han. Their proof that mT2 admits an equivalent, but implicit, definition as the ‘boundary of the region of parent and daughter masses that is kinematically consistent with the event hypothesis’ is far-reaching in its consequences. We... in the definition is lost, gives rise to a strange kink behaviour. What does all of this mean? Recently, Cheng and Han, gave an elegant interpreta- tion of the function mT2(mi) [47].4 They showed that, for a given event, it defines the boundary of the region...

Barr, Alan; Gripaios, Ben; Christopher, Lester

2009-01-01T23:59:59.000Z

346

DRAFT DO NOT QUOTE Energy Prices and Energy Intensity in China: A Structural Decomposition Analysis and Econometrics Study  

E-Print Network (OSTI)

Since the start of its economic reforms in 1978, China's energy prices relative to other prices have increased. At the same time, its energy intensity, i.e., energy consumption per unit of Gross Domestic Product (GDP), has declined dramatically, by about 70%, in spite of increases in energy consumption. Is this just a coincidence? Or does a systematic relationship exist between energy prices and energy intensity? In this study, we examine whether and how China’s energy price changes affect its energy intensity trend during 1980-2002 at a macro level. We conduct the research by using two complementary economic models: the input-output-based structural decomposition analysis (SDA) and econometric regression models and by using a decomposition method of own-price elasticity of energy intensity. Findings include a negative own-price elasticity of energy intensity, a price-inducement effect on energyefficiency improvement, and a greater sensitivity (in terms of the reaction of energy intensity towards changes in energy prices) of the industry sector, compared to the overall economy. Analysts can use these results as a starting point for China's energy and carbon

Xiaoyu Shi; Karen R. Polenske; Xiaoyu Shi; Karen R. Polenske

2005-01-01T23:59:59.000Z

347

Comparisons on offshore structure responses to random waves using linear and high-order wave theories  

E-Print Network (OSTI)

The predicted responses of an offshore structure when the wave induced kinematics are computed from different estimation methods can change significantly. The sometimes controversial results have recently motivated the development of a new methodology for wave kinematics prediction. While the methods commonly used by the offshore industry are empirical and semi-empirical modifications of Linear (random) Wave Theory, the new approach (Hybrid Wave Model) satisfies the principles of hydrodynamics and explicitly considers the non-linear effect of the wave-wave interactions on wave elevation, kinematics and evolution. This methodology has been proven to be more accurate and reliable for the estimations of wave kinematics, but its impact on the prediction of the structural response is yet to be investigated. In this study, the performance of the new methodology arid other methods currently used for kinematics prediction was tested. The (surge) response of two offshore structures designed specially for deep-oil production was estimated using three methods (Hybrid Wave Model, Wheeler "Stretching" and Linear Extrapolation) and compared with the corresponding laboratory measurements. The wave forces were computed from the conventional Morison Equation evaluating the ambient wave kinematics from the wave elevation measurements. A numerical scheme based on a Finite Element time integration technique (Newmark-beta method) was used for the response evaluation after it had been validated and calibrated by an analytical (linear) solution and measured responses for regular waves. The comparisons between measured and predicted responses using kinematics calculated from the Hybrid Wave Model showed excellent agreement, specially for the low frequency components, while those using methods based on linear modifications rendered poor underestimations. The low frequency (peak) responses of these deep-water offshore structures were found to be greatly dominated by very low frequency wave excitations, which are mainly due to the wave-wave interactions.

Ramos Heredia, Rafael Juda

1995-01-01T23:59:59.000Z

348

CE 336 Introduction to Structural Engineering (formerly Structural Mechanics I)  

E-Print Network (OSTI)

structures using classical and matrix methods; introduction to analysis software, structural design concepts Structures Structural Loads Natural Hazards Structural Performance---Sensors---IT Safety and Risk Analysis to Matrix Methods Displacement Methods Analysis Software Dec. 1 Dec. 6 Introduction to Structural Design

349

Program on Technology Innovation: Validation of CLASSI and SASSI Codes to Treat Seismic Wave Incoherence in Soil-Structure Interacti on (SSI) Analysis of Nuclear Power Plant Structures  

Science Conference Proceedings (OSTI)

The New Plant Seismic Issues Resolution Program was initiated to address emerging seismic issues as they relate to the design of new nuclear power plants. Task S2.1 of the program is a multi-phase research project to assess the effects of seismic wave incoherence on the response of foundations and structures similar to those being considered for advanced reactor designs. The initial phases of this task focused on the objective of systematically studying seismic wave incoherence effects on structures/fo...

2007-11-30T23:59:59.000Z

350

Analysis of the structural parameters that influence gas production from the Devonian shale. Annual progress report, 1979-1980. Volume II. Data repository and reports published during fiscal year 1979-1980: regional structure, surface structure, surface fractures, hydrology  

SciTech Connect

This volume comprises appendices giving regional structure data, surface structure data, surface fracture data, and hydrology data. The fracture data covers oriented Devonian shale cores from West Virginia, Ohio, Virginia, Pennsylvania, and Kentucky. The subsurface structure of the Eastern Kentucky gas field is also covered. (DLC)

Negus-De Wys, J.; Dixon, J. M.; Evans, M. A.; Lee, K. D.; Ruotsala, J. E.; Wilson, T. H.; Williams, R. T.

1980-10-01T23:59:59.000Z

351

Comparative analysis of structural concrete Quality Assurance practices on nine nuclear and three fossil fuel power plant construction projects. Final summary report  

SciTech Connect

A summary of two reports, COO/4120-1 and COO/4120-2, is given. A comparative analysis was made of the Quality Assurance practices related to the structural concrete phase on nine nuclear and three fossil fuel power plant projects which are (or have been) under construction in the United States in the past ten years. For the nuclear projects the analysis identified the response of each Quality Assurance program to the applicable criteria of 10 CFR Part 50, Appendix B as well as to the pertinent regulatory requirements and industry standards. For the fossil projects the analysis identified the response of each Quality Assurance program to criteria similar to those which were applicable in the nuclear situation. The major emphasis was placed on the construction aspects of the structural concrete phase of each project. The engineering and design aspects were examined whenever they interfaced with the construction aspects.

Willenbrock, J.H.; Thomas, H.R. Jr.; Burati, J.J. Jr.

1978-12-01T23:59:59.000Z

352

CONSTRAINTS ON THE MAGELLANIC CLOUDS' INTERACTION FROM THE DISTRIBUTION OF OB STARS AND THE KINEMATICS OF GIANTS  

SciTech Connect

Young, OB-type candidates are identified in a {approx}7900 deg{sup 2} region encompassing the Large and Small Magellanic Clouds (LMC/SMC) periphery, the Bridge, part of the Magellanic Stream (MS), and Leading Arm (LA). Selection is based on UV, optical, and IR photometry from existing large-area surveys and proper motions from the Southern Proper Motion 4 (SPM4) catalog. The spatial distribution of these young star candidates shows (1) a well-populated SMC wing which continues westward with two branches partially surrounding the SMC, (2) a rather narrow path from the SMC wing eastward toward the LMC which is offset by 1 Degree-Sign -2 Degree-Sign from the high-density H I ridge in the Bridge, (3) a well-populated periphery of the LMC dominated by clumps of stars at the ends of the LMC bar, and (4) a few scattered candidates in the MS and two overdensities in the LA regions above and below the Galactic plane. Additionally, a proper-motion analysis is made of a radial-velocity-selected sample of red giants and supergiants in the LMC, previously shown to be a kinematically and chemically distinct subgroup, most likely captured from the SMC. SPM4 proper motions of these stars also indicate they are distinct from the LMC population. The observational results presented here, combined with the known orbits of the Clouds and other aspects of the LMC morphology, suggest an off-center, moderate to highly inclined collision between the SMC and the LMC's disk that took place between 100 and 200 Myr ago.

Casetti-Dinescu, Dana I.; Girard, Terrence M.; Van Altena, William F. [Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States); Vieira, Katherine, E-mail: dana.casetti@yale.edu, E-mail: terry.girard@yale.edu, E-mail: william.vanaltena@yale.edu, E-mail: kvieira@cida.ve [Centro de Investigaciones de Astronomia, Apartado Postal 264, Merida 5101-A (Venezuela, Bolivarian Republic of)

2012-07-10T23:59:59.000Z

353

HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT ESTABLISHMENT OF METHODOLOGY FOR TIME DOMAIN SOIL STRUCTURE INTERACTION ANALYSIS OF HANFORD DST  

Science Conference Proceedings (OSTI)

M&D Professional Services, Inc. (M&D) is under subcontract to Pacific Northwest National Laboratories (PNNL) to perform seismic analysis of the Hanford Site Double-Shell Tanks (DSTs) in support of a project entitled ''Double-Shell Tank DSV Integrity Project-DST Thermal and Seismic Analyses''. The overall scope of the project is to complete an up-to-date comprehensive analysis of record of the DST System at Hanford in support of Tri-Party Agreement Milestone M-48-14. The thermal and operating loads analysis of the DSTs is documented in Rinker et al. (2004). The work statement provided to M&D (PNNL 2003) required that the seismic analysis of the DST assess the impacts of potentially non-conservative assumptions in previous analyses and account for the additional soil mass due to the as-found soil density increase, the effects of material degradation, additional thermal profiles applied to the full structure including the soil-structure response with the footings, the non-rigid (low frequency) response of the tank roof, the asymmetric seismic-induced soil loading, the structural discontinuity between the concrete tank wall and the support footing and the sloshing of the tank waste. The seismic analysis considers the interaction of the tank with the surrounding soil, and the effects of the primary tank contents. The DST and the surrounding soil are modeled as a system of finite elements. The depth and width of the soil incorporated into the analysis model are sufficient to obtain appropriately accurate analytical results. The analyses required to support the work statement differ from previous analysis of the DSTs in that the soil-structure interaction (SSI) model includes several (nonlinear) contact surfaces in the tank structure, and the contained waste must be modeled explicitly in order to capture the fluid-structure interaction behavior between the primary tank and contained waste. Soil-structure interaction analyses are traditionally solved in the frequency domain, but frequency domain analysis is limited to systems with linear responses. The nonlinear character of the coupled SSI model and tank structural model requires that the seismic analysis be solved in the time domain. However, time domain SSI analysis is somewhat nontraditional and requires that the appropriate methodology be developed and demonstrated. Moreover, the analysis of seismically induced fluid-structure interaction between the explicitly modeled waste and the primary tank must be benchmarked against known solutions to simpler problems before being applied to the more complex analysis of the DSTs. The objective of this investigation is to establish the methodology necessary to perform the required SSI analysis of the DSTs in the time domain. Specifically, the analysis establishes the capabilities and limitations of the time domain codes ANSYS and Dytran for performing seismic SSI analysis of the DSTs. The benchmarking of the codes Dytran and ANSYS for performing seismically induced fluid-structure interaction (FSI) between the contained waste and the DST primary tank are documented in Abatt (2006) and Carpenter and Abatt (2006), respectively. The results of those two studies show that both codes have the capability to analyze the fluid-structure interaction behavior of the primary tank and contained waste. As expected, Dytran appears to have more robust capabilities for FSI analysis. The ANSYS model used in that study captures much of the FSI behavior, but does have some limitations for predicting the convective response of the waste and possibly the response of the waste in the knuckle region of the primary tank. While Dytran appears to have somewhat stronger capabilities for the analysis of the FSI behavior in the primary tank, it is more practical for the overall analysis to use ANSYS. Thus, Dytran served the purpose of helping to identify limitations in the ANSYS FSI analysis so that those limitations can be addressed in the structural evaluation of the primary tank. The limitations of ANSYS for predicting the details of the convective

MACKEY, T.C.

2006-03-14T23:59:59.000Z

354

On-line Structural Integrity Monitoring and Defect Diagnosis of Steam Generators Using Analysis of Guided Acoustic Waves.  

E-Print Network (OSTI)

??Integrity monitoring and flaw diagnostics of flat beams and tubular structures was investigated in this research using guided acoustic signals. The primary objective was to… (more)

Lu, Baofu

2005-01-01T23:59:59.000Z

355

Solar Mini-Dimming Kinematics and Their Positive Correlations with Coronal Mass Ejections and Prominence  

E-Print Network (OSTI)

Solar mini-dimmings can be detect in the Extreme Ultra-Violet coro- nal eruptions. Here, sequences of 171 A images taken by Solar Dynamic Observa- tory/Atmospheric Imaging Assembaly on 13 June 2010 are used. In this special day, both of coronal mass ejection and prominence were observed. The average velocities and accelerations of 500 mini-dimmings which were detected using on feature based classifier (Alipour et al 2012) are studied. The large number of mini-dimmings shows positive accelerations in the beginning times as similar as Coronal Mass Ejections. On the the start time of prominence eruptions, the number of mini-dimmings is increased to a maximum values. There is a positive correlation between the kinematics of mini- dimmings and both CME and prominences. This study can be extended to understand the exact relationship of CMEs and mini-dimmings.

Alipour, Nasibe

2013-01-01T23:59:59.000Z

356

Lagrangian kinematics of steep waves up to the inception of a spilling breaker  

E-Print Network (OSTI)

Horizontal Lagrangian velocities and accelerations at the surface of steep water-waves are studied by Particle Tracking Velocimetry (PTV) for gradually increasing crest heights up to the inception of a spilling breaker. Localized steep waves are excited using wavemaker-generated Peregrine breather-type wave trains. Actual crest and phase velocities are estimated from video recorded sequences of the instantaneous wave shape as well as from surface elevation measurements by wave gauges. Effects of nonlinearity and spectral width on phase velocity, as well as relation between the phase velocity and crest propagation speed are discussed. The inception of a spilling breaker is associated with the horizontal velocity of water particles at the crest attaining that of the crest, thus confirming the kinematic criterion for inception of breaking.

Shemer, Lev

2013-01-01T23:59:59.000Z

357

The Virtual photon-gluon impact factor with massive quarks and exact gluon kinematics.  

E-Print Network (OSTI)

that couples to the photon, at the top of the BFKL ladder. This is not the same as the Bjorken x variable, which corresponds to the bottom of the ladder. One may relate them using [8]: xg = x [(p ? (1? z)k)2 + Qˆ2 + kˆ2 +M2] Qˆ2 ; Qˆ2 = z(1? z)Q2, (4) From... + Qˆ2 +M2 ? (p ? k) (p? k)2 + Qˆ2 +M2 )2 +M2 ( 1 p2 + Qˆ2 +M2 ? 1 (p? k)2 + Qˆ2 +M2 )2} KN . (6) The kinematic factor KN = (Qˆ2)N [(p? (1 ? z)k)2 + Qˆ2 + kˆ2 +M2]N (7) in equations (5,6) is the same as in [5] up to the simple addition ofM2...

White, C D; Peschanski, Robert B; Thorne, Robert S

358

Kinematic study of the effect of dispersion in quantum vacuum emission from strong laser pulses  

E-Print Network (OSTI)

A strong light pulse propagating in a nonlinear medium causes an effective change in the local refractive index. With a suitable tuning of the pulse velocity, the leading and trailing edge of the pulse were predicted to behave as analogue black and white horizons in the limit of a dispersionless medium. In this paper, we study a more realistic situation where the frequency dispersion of the medium is fully taken into account. As soon as positive frequency modes with negative norm are present in the comoving frame, spontaneous emission of quantum vacuum radiation is expected to arise independently of the presence of horizons. We finally investigate the kinematic constraints put on the emission and we show that the optimal directions to observe Hawking-like emission form a narrow angle with the direction of propagation of the pulse.

Stefano Finazzi; Iacopo Carusotto

2012-04-16T23:59:59.000Z

359

IS THE COSMIC MICROWAVE BACKGROUND ASYMMETRY DUE TO THE KINEMATIC DIPOLE?  

SciTech Connect

Parity violation found in the cosmic microwave background (CMB) radiation is a crucial clue for the non-standard cosmological model or the possible contamination of various foreground residuals and/or calibration of the CMB data sets. In this paper, we study the directional properties of the CMB parity asymmetry by excluding the m = 0 modes in the definition of parity parameters. We find that the preferred directions of the parity parameters coincide with the CMB kinematic dipole, which implies that the CMB parity asymmetry may be connected with the possible contamination of the residual dipole component. We also find that such tendency is not only localized at l = 2, 3, but in the extended multipole ranges up to l {approx} 22.

Naselsky, P.; Zhao, W.; Kim, J.; Chen, S. [Niels Bohr Institute and Discovery Center, Blegdamsvej 17, 2100 Copenhagen, O (Denmark)

2012-04-10T23:59:59.000Z

360

Three-Dimensional Kinematic and Microphysical Evolution of Florida Cumulonimbus. Part I: Spatial Distribution of Updrafts, Downdrafts, and Precipitation  

Science Conference Proceedings (OSTI)

This paper is the first in a three-part study that examines the kinematic and microphysical evolution of Florida cumulonimbus and focuses on the convective-to-stratiform transition of the storm. This first paper lays the groundwork for the ...

Sandra E. Yuter; Robert A. Houze Jr.

1995-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


361

The Bowdle, South Dakota, Cyclic Tornadic Supercell of 22 May 2010: Surface Analysis of Rear-Flank Downdraft Evolution and Multiple Internal Surges  

Science Conference Proceedings (OSTI)

Mobile mesonet sampling in the hook echo/rear-flank downdraft (RFD) region of a tornadic supercell near Bowdle, South Dakota, provided the opportunity to examine RFD thermodynamic and kinematic attributes and evolution. Focused analysis of the ...

Bruce D. Lee; Catherine A. Finley; Christopher D. Karstens

2012-11-01T23:59:59.000Z

362

Structural analysis of Hanford`s single-shell 241-C-106 tank: A first step toward waste-tank remediation  

SciTech Connect

The buried single-shell waste tank 241-C-106, located at the US Department of Energy`s Hanford Site, has been a repository for various liquid radioactive waste materials since its construction in 1943. A first step toward waste tank remediation is demonstrating that remediation activities can be performed safely. Determination of the current structural capacity of this high-heat tank is an important element in this assessment. A structural finite-element model of tank 241-C-106 has been developed to assess the tank`s structural integrity with respect to in situ conditions and additional remediation surface loads. To predict structural integrity realistically, the model appropriately addresses two complex issues: (1) surrounding soil-tank interaction associated with thermal expansion cycling and surcharge load distribution and (2) concrete-property degradation and creep resulting from exposure to high temperatures generated by the waste. This paper describes the development of the 241-C-106 structural model, analysis methodology, and tank-specific structural acceptance criteria.

Harris, J.P.; Julyk, L.J.; Marlow, R.S.; Moore, C.J. [Westinghouse Hanford Co., Richland, WA (United States); Day, J.P.; Dyrness, A.D.; Jagadish, P.; Shulman, J.S. [Advent Engineering Services, Inc., San Ramon, CA (United States)

1993-10-01T23:59:59.000Z

363

Deuteron Spin Structure Functions in the Resonance and DIS Regions  

SciTech Connect

We derive relations between spin-dependent nuclear and nucleon g_1 and g_2 structure functions, valid at all Q^2, and in both the resonance and deep inelastic regions. We apply the formalism to the specific case of the deuteron, which is often used as a source of neutron structure information, and compare the size of the nuclear corrections calculated using exact kinematics and using approximations applicable at large Q^2.

S. Kulagin; W. Melnitchouk

2007-10-03T23:59:59.000Z

364

Precision measurement of the neutron spin dependent structure functions  

Science Conference Proceedings (OSTI)

In experiment E154 at the Stanford Linear Accelerator Center the spin dependent structure function g{sub 1}{sup n} (x, Q{sup 2}) of the neutron was measured by scattering longitudinally polarized 48.3 GeV electrons off a longitudinally polarized {sup 3}He target. The high beam energy allowed the author to extend the kinematic coverage compared to the previous SLAC experiments to 0.014 {le} x {le} 0.7 with an average Q{sup 2} of 5 GeV{sup 2}. The author reports the integral of the spin dependent structure function in the measured range to be {integral}{sub 0.014}{sup 0.7} dx g{sub 1}{sup n}(x, 5 GeV{sup 2}) = {minus}0.036 {+-} 0.004(stat.) {+-} 0.005(syst.). The author observes relatively large values of g{sub 1}{sup n} at low x that call into question the reliability of data extrapolation to x {r_arrow} 0. Such divergent behavior disagrees with predictions of the conventional Regge theory, but is qualitatively explained by perturbative QCD. The author performs a Next-to-Leading Order perturbative QCD analysis of the world data on the nucleon spin dependent structure functions g{sub 1}{sup p} and g{sub 1}{sup n} paying careful attention to the experimental and theoretical uncertainties. Using the parameterizations of the helicity-dependent parton distributions obtained in the analysis, the author evolves the data to Q{sup 2} = 5 GeV{sup 2}, determines the first moments of the polarized structure functions of the proton and neutron, and finds agreement with the Bjorken sum rule.

Kolomensky, Y.G.

1997-02-01T23:59:59.000Z

365

Design and Analysis for the Carbon Fiber Composite Support Structure for Layer 0 of the D0 Silicon Micro Tracker  

Science Conference Proceedings (OSTI)

The support structures for the new Layer 0 (Figures 1, 2, 3) of the Run 2b silicon tracker in D0 were designed and fabricated at the University of Washington. These structures were required to have minimum mass, yet be very rigid so as to meet the high precision requirements placed on the position of the silicon detector chips. They also have to provide for cooling to remove the heat generated by the sensors and signal processing electronics and to keep the sensors at the desired operating temperature (below -5 C). All of these requirements were best met by carbon fiber/epoxy composite technology. State of the art carbon fiber materials have extremely high Young's moduli and high thermal conductivity. Appropriate fiber lay-ups and fabrication methods have been developed and used successfully to produce both various prototype structures and the structures used in the production Layer 0. The geometry of these structures was determined mainly by the geometry of the sensors themselves. The structures incorporated a complete cooling system consisting of extruded PEEK coolant tubes and distribution manifolds made from carbon fiber composites. In order to determine the mechanical and thermal performance of the structures, detailed FEA analyses of L0 have been carried out and are described.

Daly, C.H.; Tuttle, Mark E.; Kuykendall, William; /Washington U., Seattle

2009-01-01T23:59:59.000Z

366

A comparative analysis of business structures suitable for farmer-owned wind power projects in the United States  

E-Print Network (OSTI)

Support for Community Wind Power Development. LBNL-54715.Analysis of Community Wind Power Development Options inWhip Up Hopes for Wind Power Again. ” The Wall Street

Bolinger, Mark; Wiser, Ryan

2004-01-01T23:59:59.000Z

367

A Mesoscale Gravity-Wave Event Observed during CCOPE. Part IV: Stability Analysis and Doppler-derived Wave Vertical Structure  

Science Conference Proceedings (OSTI)

This paper summarizes the results of a detailed study from the Cooperative Convective Precipitation Experiment (CCOPE) of the vertical structure of mesoscale gravity waves that disturbed a sizable part of the troposphere and that played a ...

Steven E. Koch; F. Einaudi; Paul B. Dorian; Stephen Lang; Gerald M. Heymsfield

1993-09-01T23:59:59.000Z

368

Quantitative size-dependent structure and strain determination of CdSe nanoparticles using atomic pair distribution function analysis  

E-Print Network (OSTI)

The size-dependent structure of CdSe nanoparticles, with diameters ranging from 2 to 4 nm, has been studied using the atomic pair distribution function (PDF) method. The core structure of the measured CdSe nanoparticles can be described in terms of the wurtzite atomic structure with extensive stacking faults. The density of faults in the nanoparticles ~50% . The diameter of the core region was extracted directly from the PDF data and is in good agreement with the diameter obtained from standard characterization methods suggesting that there is little surface amorphous region. A compressive strain was measured in the Cd-Se bond length that increases with decreasing particle size being 0.5% with respect to bulk CdSe for the 2 nm diameter particles. This study demonstrates the size-dependent quantitative structural information that can be obtained even from very small nanoparticles using the PDF approach.

A. S. Masadeh; E. Bozin; C. L. Farrow; G. Paglia; P. Juhas; A. Karkamkar; M. G. Kanatzidis; S. J. L. Billinge

2007-04-10T23:59:59.000Z

369

Reconstructing the past: architectural analysis of communal structures at the NAN Ranch ruin (LA2465), Grant County, New Mexico  

E-Print Network (OSTI)

Eleven seasons of field work at the NAN Ranch ruin (LA 2465), a multicomponent Mimbres site in Grant County, New Mexico, have allowed researchers to reconstruct a detailed sequence of architectural development stretching from the Three Circle phase (A.D. 750-900) to the Classic period (A.D. 1000-1130). During the course of excavation, investigators exposed a number of structures that are believed to have served in a communal or integrative capacity. This structure type served as the focus for this work. The purpose of this study was threefold: a) to present detailed descriptions of those structures believed to have served in a communal or integrative capacity; b) to trace the development of this structure type from its first known manifestations at the NAN Ranch ruin in the Three Circle phase to its latest forms at the end of the Classic period; and c) to analyze these structures as a distinct social space, both at the intramural and site level. Eleven structures are described in detail in this text. Six other spaces are also briefly described. Careful attention to detail has allowed this study to address whether previous judgements about the function of the rooms noted herein are in fact supportable. Scrutiny of architectural features also permitted a consideration of how well generally accepted indicators of communal space apply in the case of the NAN Ranch ruin. Finally, the structure provided by the architectural descriptions served as a foundation on which to base a number of inferences concerning population-guided socio-cultural change. Whereas architectural data suggest a shift away from a site-inclusive to a more privatized, lineage-based communal organization during the Late Pithouse/Classic period transition, the appearance of a new structure type at the end of the Classic period suggests that population pressures fostered social reorganization at the room block level around A.D. 1100.

Burden, Damon Andrew

2001-01-01T23:59:59.000Z

370

A HST/WFC3-IR MORPHOLOGICAL SURVEY OF GALAXIES AT z = 1.5-3.6. II. THE RELATION BETWEEN MORPHOLOGY AND GAS-PHASE KINEMATICS  

SciTech Connect

We analyze rest-frame optical morphologies and gas-phase kinematics as traced by rest-frame far-UV and optical spectra for a sample of 204 star-forming galaxies in the redshift range z {approx} 2-3 drawn from the Keck Baryonic Structure Survey. We find that spectroscopic properties and gas-phase kinematics are closely linked to morphology: compact galaxies with semimajor axis radii r {approx}< 2 kpc are substantially more likely than their larger counterparts to exhibit Ly{alpha} in emission. Although Ly{alpha} emission strength varies widely within galaxies of a given morphological type, all but one of 19 galaxies with Ly{alpha} equivalent width W {sub Ly{alpha}} > 20 A have compact and/or multiple-component morphologies with r {<=} 2.5 kpc. The velocity structure of absorption lines in the galactic continuum spectra also varies as a function of morphology. Galaxies of all morphological types drive similarly strong outflows (as traced by the blue wing of interstellar absorption line features), but the outflows of larger galaxies are less highly ionized and exhibit larger optical depth at the systemic redshift that may correspond to a decreasing efficiency of feedback in evacuating gas from the galaxy. This v {approx} 0 km s{sup -1} gas is responsible both for shifting the mean absorption line redshift and attenuating W {sub Ly{alpha}} (via a longer resonant scattering path) in galaxies with larger rest-optical half-light radii. In contrast to galaxies at lower redshifts, there is no evidence for a correlation between outflow velocity and inclination, suggesting that outflows from these puffy and irregular systems may be poorly collimated. Our observations are broadly consistent with theoretical models of inside-out growth of galaxies in the young universe, in which typical z {approx} 2-3 star-forming galaxies are predominantly unstable, dispersion-dominated, systems fueled by rapid gas accretion that later form extended rotationally supported disks when stabilized by a sufficiently massive stellar component.

Law, David R. [Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, Ontario M5S 3H4 (Canada); Steidel, Charles C. [Department of Astronomy, California Institute of Technology, MS 249-17, Pasadena, CA 91125 (United States); Shapley, Alice E.; Nagy, Sarah R. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Reddy, Naveen A. [Department of Physics and Astronomy, University of California, Riverside, CA 92521 (United States); Erb, Dawn K., E-mail: drlaw@di.utoronto.ca, E-mail: ccs@astro.caltech.edu, E-mail: aes@astro.ucla.edu, E-mail: snagy@ucla.edu [Department of Physics, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, WI 53201 (United States)

2012-11-01T23:59:59.000Z

371

Analysis  

NLE Websites -- All DOE Office Websites (Extended Search)

Analysis Analysis of Short-Bunch Production with the APS Booster and a Bunch Compressor Michael Borland, AOD/OAG ∗ August 8, 2003 1 Abstract There is significant interest among x-ray scientists in short-pulse x-rays. The x-rays from the APS ring, although very bright, are produced by an electron bunch with an rms length of more than 30 ps. Typically, it is only a linear accelerator that can produce a very short bunch. An idea was brought to my attention by Glenn Decker that might allow us to produce a short bunch using the APS booster. This idea involves extracting the beam from the booster at 3 to 4 GeV, while it is still relatively short, then compressing it with a magnetic bunch compressor. In this note, we present a preliminary analysis of this idea, along with the related idea of using a nonequilibrium beam from the APS photoinjector. 2 Background We will begin with an examination of the ideal result

372

An in-depth analysis of the biological functional studies based on the NMR M2 channel structure of influenza A virus  

SciTech Connect

The long-sought three-dimensional structure of the M2 proton channel of influenza A virus was successfully determined recently by the high-resolution NMR [J.R. Schnell, J.J. Chou, Structure and mechanism of the M2 proton channel of influenza A virus, Nature 451 (2008) 591-595]. Such a milestone work has provided a solid structural basis for studying drug-resistance problems. However, the action mechanism revealed from the NMR structure is completely different from the traditional view and hence prone to be misinterpreted as 'conflicting' with some previous biological functional studies. To clarify this kind of confusion, an in-depth analysis was performed for these functional studies, particularly for the mutations D44N, D44A and N44D on position 44, and the mutations on positions 27-38. The analyzed results have provided not only compelling evidences to further validate the NMR structure but also very useful clues for dealing with the drug-resistance problems and developing new effective drugs against H5N1 avian influenza virus, an impending threat to human beings.

Huang Ribo [Guangxi Academy of Sciences, 98 Daling Road, Nanning, Guangxi 530004 (China); Du Qishi [College of Life Science and Technique, Guangxi University, 100 University Road, Nanning, Guangxi 530004 (China); College of Chemistry and Life Science, Tianjin Normal University, Tianjin, 300074 (China); Gordon Life Science Institute, San Diego, CA 92130 (United States)], E-mail: qishi_du@yahoo.com.cn; Wang Chenghua [College of Chemistry and Life Science, Tianjin Normal University, Tianjin, 300074 (China); Chou, K.-C. [Gordon Life Science Institute, San Diego, CA 92130 (United States)

2008-12-26T23:59:59.000Z

373

Structure and Evolution of Hurricane Claudette on 7 September 1991 from Airborne Doppler Radar Observations. Part I: Kinematics  

Science Conference Proceedings (OSTI)

On 7 September 1991, an experiment was conducted with the two National Oceanic and Atmospheric Administration (NOAA) WP-3D research aircraft to investigate the inner-core region of Hurricane Claudette. Both aircraft carried airborne Doppler radar,...

Frank Roux; Nicolas Viltard

1995-09-01T23:59:59.000Z

374

The Kinematic Structure of Hurricane Gloria (1985) Determined from Nested Analyses of Dropwindsonde and Doppler Radar Data  

Science Conference Proceedings (OSTI)

A set of three-dimensional, filtered, multiply nested objective analyses has been completed for the wind field of Hurricane Gloria for 0000 UTC 25 September 1985. At this time Gloria was one of the most intense hurricanes ever observed in the ...

James L. Franklin; Stephen J. Lord; Steven E. Feuer; Frank D. Marks Jr.

1993-09-01T23:59:59.000Z

375

Tropical Cyclone Kinematic Structure Retrieved from Single-Doppler Radar Observations. Part II: The GBVTD-Simplex Center Finding Algorithm  

Science Conference Proceedings (OSTI)

This paper is the second of a series and focuses on developing an algorithm to objectively identify tropical cyclone (TC) vorticity centers using single-Doppler radar data. The first paper dealt with the formulation of a single-Doppler radar TC ...

Wen-Chau Lee; Frank D. Marks Jr.

2000-06-01T23:59:59.000Z

376

PROBING THE STRUCTURE AND KINEMATICS OF THE TRANSITION LAYER BETWEEN THE MAGELLANIC STREAM AND THE HALO IN H I  

Science Conference Proceedings (OSTI)

The Magellanic Stream (MS) is a nearby laboratory for studying the fate of cool gas streams injected into a gaseous galactic halo. We investigate properties of the boundary layer between the cool MS gas and the hot Milky Way halo with 21 cm H I observations of a relatively isolated cloud having circular projection in the northern MS. Through averaging and modeling techniques, our observations, obtained with the Robert C. Byrd Green Bank Telescope, reach unprecedented 3{sigma} sensitivity of {approx}1 Multiplication-Sign 10{sup 17} cm{sup -2}, while retaining the telescope's 9.'1 resolution in the essential radial dimension. We find an envelope of diffuse neutral gas with FWHM of 60 km s{sup -1}, associated in velocity with the cloud core having FWHM of 20 km s{sup -1}, extending to 3.5 times the core radius with a neutral mass seven times that of the core. We show that the envelope is too extended to represent a conduction-dominated layer between the core and the halo. Its observed properties are better explained by a turbulent mixing layer driven by hydrodynamic instabilities. The fortuitous alignment of the NGC 7469 background source near the cloud center allows us to combine UV absorption and H I emission data to determine a core temperature of 8350 {+-} 350 K. We show that the H I column density and size of the core can be reproduced when a slightly larger cloud is exposed to Galactic and extragalactic background ionizing radiation. Cooling in the large diffuse turbulent mixing layer envelope extends the cloud lifetime by at least a factor of two relative to a simple hydrodynamic ablation case, suggesting that the cloud is likely to reach the Milky Way disk.

Nigra, Lou; Stanimirovic, Snezana; Gallagher, John S. III [Department of Astronomy, University of Wisconsin, 475 North Charter Street, Madison, WI 53706 (United States); Wood, Kenneth [School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS (United Kingdom); Nidever, David; Majewski, Steven, E-mail: lou@zooniverse.org, E-mail: sstanimi@astro.wisc.edu, E-mail: jsg@astro.wisc.edu, E-mail: kw25@st-andrews.ac.uk, E-mail: dnidever@virginia.edu, E-mail: srm4n@virginia.edu [Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325 (United States)

2012-11-20T23:59:59.000Z

377

A perceptual approach to the analysis of J. C. Risset’s Sud: sound, structure and symbol  

Science Conference Proceedings (OSTI)

Assuming that perception works as a constant dialectic between sense-data and concept, this paper presents a perceptual analysis of J. C. Risset‘s Sud according to a conceptual framework based on a complementarity between intrinsic and extrinsic ...

Giselle Martins Dos Santos Ferreira

1997-08-01T23:59:59.000Z

378

Structural Analysis of a Ni-Methyl Species in Methyl-Coenzyme M Reductase from Methanothermobacter marburgensis  

SciTech Connect

We present the 1.2 {angstrom} resolution X-ray crystal structure of a Ni-methyl species that is a proposed catalytic intermediate in methyl-coenzyme M reductase (MCR), the enzyme that catalyzes the biological formation of methane. The methyl group is situated 2.1 {angstrom} proximal of the Ni atom of the MCR coenzyme F{sub 430}. A rearrangement of the substrate channel has been posited to bring together substrate species, but Ni(III)-methyl formation alone does not lead to any observable structural changes in the channel.

Cedervall, Peder E.; Dey, Mishtu; Li, Xianghui; Sarangi, Ritimukta; Hedman, Britt; Ragsdale, Stephen W.; Wilmot, Carrie M. (Michigan); (SLAC); (UMM)

2012-02-15T23:59:59.000Z

379

First-Order Structure Function Analysis of Statistical Scale Invariance in the AIRS-Observed Water Vapor Field  

Science Conference Proceedings (OSTI)

The power-law scale dependence, or scaling, of first-order structure functions of the tropospheric water vapor field between 58°S and 58°N is investigated using observations from the Atmospheric Infrared Sounder (AIRS). Power-law scale dependence ...

Kyle G. Pressel; William D. Collins

2012-08-01T23:59:59.000Z

380

High-resolution structural and thermodynamic analysis of extreme stabilization of human procarboxypeptidase by computational protein design  

E-Print Network (OSTI)

Recent efforts to design de novo or redesign the sequence and structure of proteins using computational techniques have met with significant success. Most, if not all, of these computational methodologies attempt to model atomic-level interactions, and hence high-resolution structural characterization of the designed proteins is critical for evaluating the atomic-level accuracy of the underlying design force-fields. We previously used our computational protein design protocol RosettaDesign to completely redesign the sequence of the activation domain of human procarboxypeptidase A2. With 68 % of the wild-type sequence changed, the designed protein, AYEdesign, is over 10 kcal/mol more stable than the wild-type protein. Here, we describe the high-resolution crystal structure and solution NMR structure of AYEdesign, which show that the experimentally determined backbone and side-chains conformations are effectively superimposable with the computational model at atomic resolution. To isolate the origins of the remarkable stabilization, we have designed and

Gautam Dantas; Colin Corrent; Steve L. Reichow; James J. Havranek; Ziad M. Eletr; Nancy G. Isern; Brian Kuhlman; Gabriele Varani; Ethan A. Merritt; David Baker; Howard Hughes Medical

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

LENDA, a Low Energy Neutron Detector Array for experiments with radioactive beams in inverse kinematics  

E-Print Network (OSTI)

The Low Energy Neutron Detector Array (LENDA) is a neutron time-of-flight (TOF) spectrometer developed at the National Superconducting Cyclotron Lab- oratory (NSCL) for use in inverse kinematics experiments with rare isotope beams. Its design has been motivated by the need to study the spin-isospin response of unstable nuclei using (p, n) charge-exchange reactions at intermediate energies (> 100 MeV/u). It can be used, however, for any reaction study that involves emission of low energy neutrons (150 keV - 10 MeV). The array consists of 24 plastic scintillator bars and is capable of registering the recoiling neutron energy and angle with high detection efficiency. The neutron energy is determined by the time-of-flight technique, while the position of interaction is deduced using the timing and energy information from the two photomultipliers of each bar. A simple test setup utilizing radioactive sources has been used to characterize the array. Results of test measurements are compared with simulations. A neutron energy threshold of 20 % for neutrons below 4 MeV have been obtained.

G. Perdikakis; M. Sasano; Sam M. Austin; D. Bazin; C. Caesar; S. Cannon; J. M. Deaven; H. J. Doster; C. J. Guess; G. W. Hitt; J. Marks; R. Meharchand; D. T. Nguyen; D. Peterman; A. Prinke; M. Scott; Y. Shimbara; K. Thorne; L. Valdez; R. G. T. Zegers

2011-11-17T23:59:59.000Z

382

The elaboration of spiral galaxies: morpho-kinematics analyses of their progenitors with IMAGES  

E-Print Network (OSTI)

The IMAGES project aims at measuring the velocity fields of a representative sample of 100 massive galaxies at z=0.4-0.75, selected in the CDFS, the CFRS and the HDFS fields. It uses the world-unique mode of multiple integral field units of FLAMES/ GIRAFFE at VLT. The resolved-kinematics data allow us to sample the large scale motions at ~ few kpc scale for each galaxy. They have been combined with the deepest HST/ACS, Spitzer (MIPS and IRAC) and VLT/FORS2 ever achieved observations. Most intermediate redshift galaxies show anomalous velocity fields: 6 Gyrs ago, half of the present day spirals were out of equilibrium and had peculiar morphologies. The wealth of the data in these fields allow us to modelize the physical processes in each galaxy with an accuracy almost similar to what is done in the local Universe. These detailed analyses reveal the importance of merger processes, including their remnant phases. Together with the large evolution of spiral properties, this points out the importance of disk survi...

Hammer, F

2009-01-01T23:59:59.000Z

383

The kinematics of late type stars in the solar cylinder studied with SDSS data  

E-Print Network (OSTI)

We study the velocity distribution of Milky Way disk stars in a kiloparsec-sized region around the Sun, based on ~ 2 million M-type stars from DR7 of SDSS, which have newly re-calibrated absolute proper motions from combining SDSS positions with the USNO-B catalogue. We estimate photometric distances to all stars, accurate to ~ 20 %, and combine them with the proper motions to derive tangential velocities for this kinematically unbiased sample of stars. Based on a statistical de-projection method we then derive the vertical profiles (to heights of Z = 800 pc above the disk plane) for the first and second moments of the three dimensional stellar velocity distribution. We find that = -7 +/- 1 km/s and = -9 +/- 1 km/s, independent of height above the mid-plane, reflecting the Sun's motion with respect to the local standard of rest. In contrast, changes distinctly from -20 +/- 2 km/s in the mid-plane to = -32 km/s at Z = 800 pc, reflecting an asymmetric drift of the stellar mean velocity that increases with h...

Fuchs, B; Rix, H -W; Beers, T C; Bizyaev, D; Brewington, H; Jahreiss, H; Klement, R; Malanushenko, E; Malanushenko, V; Oravetz, D; Pan, K; Simmons, A; Snedden, S

2009-01-01T23:59:59.000Z

384

Design and engineering of low-cost centimeter-scale repeatable and accurate kinematic fixtures for nanomanufacturing equipment using magnetic preload and potting  

E-Print Network (OSTI)

This paper introduces a low-cost, centimeter-scale kinematic coupling fixture for use in nanomanufacturing equipment. The fixture uses magnetic circuit design techniques to optimize the magnetic preload required to achieve ...

Watral, Adrienne

2011-01-01T23:59:59.000Z

385

Three-Dimensional Kinematic and Microphysical Evolution of Florida Cumulonimbus. Part II: Frequency Distributions of Vertical Velocity, Reflectivity, and Differential Reflectivity  

Science Conference Proceedings (OSTI)

High-resolution radar data collected in Florida during the Convection and Precipitation/Electrification Experiment are used to elucidate the microphysical and kinematic processes occurring during the transition of a multicellular storm from ...

Sandra E. Yuter; Robert A. Houze Jr.

1995-07-01T23:59:59.000Z

386

Interpolation Errors in Wind Fields as a Function of Spatial and Temporal Resolution and Their Impact on Different Types of Kinematic Trajectories  

Science Conference Proceedings (OSTI)

This paper discusses some of the uncertainties that influence kinematic trajectory calculations. The interpolation errors due to different interpolation schemes are examined by degrading high-resolution wind fields from a numerical weather ...

Andreas Stohl; Gerhard Wotawa; Petra Seibert; Helga Kromp-Kolb

1995-10-01T23:59:59.000Z

387

Analysis of the murine Dtk gene identifies conservation of genomic structure within a new receptor tyrosine kinase subfamily  

SciTech Connect

The receptor tyrosine kinase Dtk/Tyro 3/Sky/rse/brt/tif is a member of a new subfamily of receptors that also includes Axl/Ufo/Ark and Eyk/Mer. These receptors are characterized by the presence of two immunoglobulin-like loops and two fibronectin type III repeats in their extracellular domains. The structure of the murine Dtk gene has been determined. The gene consists of 21 exons that are distributed over 21 kb of genomic DNA. An isoform of Dtk is generated by differential splicing of exons from the 5{prime} region of the gene. The overall genomic structure of Dtk is virtually identical to that determined for the human UFO gene. This particular genomic organization is likely to have been duplicated and closely maintained throughout evolution. 38 refs., 3 figs., 1 tab.

Lewis, P.M.; Crosier, K.E.; Crosier, P.S. [Univ. of Auckland (New Zealand)] [and others] [Univ. of Auckland (New Zealand); and others

1996-01-01T23:59:59.000Z

388

Market structure and competition: a cross-market analysis of U.S. electricity deregulation, CSEM Working Paper No  

E-Print Network (OSTI)

This paper examines the importance of market characteristics in restructured electricity markets. We measure market performance relative to benchmarks that abstract away from market design characteristics but capture important structural elements. Specifically, we estimate market outcomes under an assumption of perfect competition and under an assumption of Cournot competition in three U.S. markets: California, New England, and PJM. These two counter-factual assumptions bound the space of possible static, non-cooperative outcomes. By establishing where actual market outcomes fall within these bounds, we can compare how markets perform relative to the extremes determined by structural factors alone. Our findings suggest that vertical arrangements between suppliers and retailers, dramatically affect estimated market outcomes. When we include vertical arrangements in firms ’ objective functions, Cournot equilibrium prices in both PJM and New England fall dramatically. California did not have such arrangements. After accounting for vertical arrangements, performance in each market relative to Cournot is similar, particularly during hours of peak demand.

James Bushnell; Erin T. Mansur; Celeste Saravia; James Bushnell; Erin T. Mansur; Celeste Saravia; Steve Puller; Peter Schott; Frank Wolak

2004-01-01T23:59:59.000Z

389

Extreme Gas Kinematics in the z=2.2 Powerful Radio Galaxy MRC1138-262: Evidence for Efficient AGN Feedback in the Early Universe?  

Science Conference Proceedings (OSTI)

To explain the properties of the most massive low-redshift galaxies and the shape of their mass function, recent models of galaxy evolution include strong AGN feedback to complement starburst-driven feedback in massive galaxies. Using the near-infrared integral-field spectrograph SPIFFI on the VLT, we searched for direct evidence for such a feedback in the optical emission line gas around the z = 2.16 powerful radio galaxy MRC1138-262, likely a massive galaxy in formation. The kpc-scale kinematics, with FWHMs and relative velocities {approx} L* galaxy within a few 10 to 100 Myrs, fast enough to preserve the observed [{alpha}/Fe] overabundance in massive galaxies at low redshift. Using simple arguments, it appears that feedback like that observed in MRC1138-262 may have sufficient energy to inhibit material from infalling into the dark matter halo and thus regulate galaxy growth as required in some recent models of hierarchical structure formation.

Nesvadba, N H; Lehnert, M D; Eisenhauer, F; Gilbert, A M; Tecza, M; Abuter, R

2007-06-26T23:59:59.000Z

390

Short note: An automated system for the statistical analysis of sediment texture and structure at the micro scale  

Science Conference Proceedings (OSTI)

A macro has been developed that allows for automated statistical analyses of particles. It can be used with binary images from any source, and is developed for use with lacustrine, marine, Aeolian, and marine sediments. The macro code is freely available, ... Keywords: Image analysis, ImageJ, Macro, Particle size, Sediment

Ted Lewis; Pierre Francus; Raymond S. Bradley; Kinuyo Kanamaru

2010-10-01T23:59:59.000Z

391

Structural brain changes in first episode Schizophrenia compared with Fronto-Temporal Lobar Degeneration: a meta-analysis  

E-Print Network (OSTI)

. Ellison-Wright I, Glahn DC, Laird AR, Thelen SM, Bullmore E: The anatomy of first-episode and chronic schizophrenia: an anatomical likelihood estimation meta-analysis. Am J Psychiatry 2008, 165(8):1015–23. 2. Keshavan MS, Tandon R, Boutros NN, Nasrallah HA...

Olabi, Bayanne; Ellison-Wright, Ian; Bullmore, Ed; Lawrie, Stephen M

2012-08-07T23:59:59.000Z

392

Detection, size, measurement and structural analysis limits for the 2MASS, UKIDSS-LAS & VISTA VIKING surveys  

E-Print Network (OSTI)

The 2MASS, UKIDSS-LAS and VISTA VIKING surveys have all now observed the GAMA 9hr region in the $K_s$ band. Here we compare the detection rates, photometry, basic size measurements, and single-component GALFIT structural measurements for a sample of 37,591 galaxies. We explore the sensitivity limits where the data agree for a variety of issues including: detection, star-galaxy separation, photometric measurements, size and ellipticity measurements, and S\\'{e}rsic measurements. We find that 2MASS fails to detect at least 20% of the galaxy population within all magnitude bins, however for those that are detected we find photometry is robust ($\\pm$ 0.2 mag) to 14.7 AB mag and star-galaxy separation to 14.8 AB mag. For UKIDSS-LAS we find incompleteness starts to enter at a flux limit of 18.9 AB mag, star-galaxy separation is robust to 16.3 AB mag and structural measurements are robust to 17.7 AB mag. VISTA VIKING data is complete to approximately 20.0 AB mag and structural measurements appear robust to 18.8 AB ma...

Andrews, Stephen K; Driver, Simon P; Robotham, Aaron S G

2013-01-01T23:59:59.000Z

393

HANFORD DST THERMAL & SEISMIC PROJECT ANSYS BENCHMARK ANALYSIS OF SEISMIC INDUCED FLUID STRUCTURE INTERACTION IN A HANFORD DOUBLE SHELL PRIMARY TANK  

Science Conference Proceedings (OSTI)

M&D Professional Services, Inc. (M&D) is under subcontract to Pacific Northwest National Laboratories (PNNL) to perform seismic analysis of the Hanford Site Double-Shell Tanks (DSTs) in support of a project entitled ''Double-Shell Tank (DSV Integrity Project-DST Thermal and Seismic Analyses)''. The overall scope of the project is to complete an up-to-date comprehensive analysis of record of the DST System at Hanford in support of Tri-Party Agreement Milestone M-48-14. The work described herein was performed in support of the seismic analysis of the DSTs. The thermal and operating loads analysis of the DSTs is documented in Rinker et al. (2004). The overall seismic analysis of the DSTs is being performed with the general-purpose finite element code ANSYS. The overall model used for the seismic analysis of the DSTs includes the DST structure, the contained waste, and the surrounding soil. The seismic analysis of the DSTs must address the fluid-structure interaction behavior and sloshing response of the primary tank and contained liquid. ANSYS has demonstrated capabilities for structural analysis, but the capabilities and limitations of ANSYS to perform fluid-structure interaction are less well understood. The purpose of this study is to demonstrate the capabilities and investigate the limitations of ANSYS for performing a fluid-structure interaction analysis of the primary tank and contained waste. To this end, the ANSYS solutions are benchmarked against theoretical solutions appearing in BNL 1995, when such theoretical solutions exist. When theoretical solutions were not available, comparisons were made to theoretical solutions of similar problems and to the results from Dytran simulations. The capabilities and limitations of the finite element code Dytran for performing a fluid-structure interaction analysis of the primary tank and contained waste were explored in a parallel investigation (Abatt 2006). In conjunction with the results of the global ANSYS analysis reported in Carpenter et al. (2006), the results of the two investigations will be compared to help determine if a more refined sub-model of the primary tank is necessary to capture the important fluid-structure interaction effects in the tank and if so, how to best utilize a refined sub-model of the primary tank. Both rigid tank and flexible tank configurations were analyzed with ANSYS. The response parameters of interest are total hydrodynamic reaction forces, impulsive and convective mode frequencies, waste pressures, and slosh heights. To a limited extent: tank stresses are also reported. The results of this study demonstrate that the ANSYS model has the capability to adequately predict global responses such as frequencies and overall reaction forces. Thus, the model is suitable for predicting the global response of the tank and contained waste. On the other hand, while the ANSYS model is capable of adequately predicting waste pressures and primary tank stresses in a large portion of the waste tank, the model does not accurately capture the convective behavior of the waste near the free surface, nor did the model give accurate predictions of slosh heights. Based on the ability of the ANSYS benchmark model to accurately predict frequencies and global reaction forces and on the results presented in Abatt, et al. (2006), the global ANSYS model described in Carpenter et al. (2006) is sufficient for the seismic evaluation of all tank components except for local areas of the primary tank. Due to the limitations of the ANSYS model in predicting the convective response of the waste, the evaluation of primary tank stresses near the waste free surface should be supplemented by results from an ANSYS sub-model of the primary tank that incorporates pressures from theoretical solutions or from Dytran solutions. However, the primary tank is expected to have low demand to capacity ratios in the upper wall. Moreover, due to the less than desired mesh resolution in the primary tank knuckle of the global ANSYS model, the evaluation of the primary tank stresses in the lo

MACKEY, T.C.

2006-03-14T23:59:59.000Z

394

Bite performance and feeding kinematics in loggerhead turtles (Caretta caretta) within the context of longline fishery interactions  

E-Print Network (OSTI)

Feeding biomechanics and foraging behavior are likely contributors to loggerhead sea turtle (Caretta caretta) bycatch in the pelagic longline fishery. To investigate these contributions, loggerhead bite performance was measured in several size classes of captive-reared juveniles, captive sub-adults and adults, as well as wild loggerheads. A kinematic study was conducted to investigate loggerhead interactions with modified longline hooks. Kinematic and behavioral variables were assessed in relation to five longline hooks to determine if loggerhead feeding behavior is modulated relative to hook type, size, and offset. The bite force study demonstrated that mean maximum post-hatchling bite force was 2.5N and mass was the best predictor of post-hatchling bite force. Mean maximum bite force of juveniles with mean straight carapace length (SCL) of 12, 31, 44, and 65 cm were 27, 152, 343, and 374 N, respectively. Sub-adult and adult mean maximum bite force was 575 N. Maximum bite force had a positive linear relationship with all head and body morphometrics (P<0.001). Carapace width was the best predictor of bite force throughout ontogeny. The kinematic study demonstrated no differences between hook treatments in all kinematic variables analyzed. The results of this study suggest loggerhead feeding behavior may be stereotypical. Only 33% of all interactions resulted in “hooking” events. “Hooking” was lowest in 16 gage circle hooks with no offset and the 18 gage circle hooks with 10°offset which may be indicative of a lower possibility of the turtle drowning. “Hooking” was highest in the 16 gage circle hooks with 10°offset. The proportion of turtles “hooked” in the mouth was significantly greater than those “hooked” in the throat (P=0.001). Sixteen gage circle hooks with 10° offset had the highest percentage of throat “hooking”, and the 18 gage circle hooks without offset resulted in the lowest percentage of throat hooking. When interacting with J hooks with a 25° offset (9 gage), turtles mostly oriented their head away from the hook offset; however, when interacting with the 16 and 18 gage circle hooks with 10° offset, turtles mostly oriented their heads toward the hook offset. These data suggest that turtles may distinguish between small and large offsets, and may modulate their feeding behavior accordingly. Alternatively, turtles may be detecting hook size or hook shape. A more thorough characterization of loggerhead bite performance and feeding kinematics will be useful when developing or modifying longline fishery gear aimed at reducing loggerhead bycatch.

Guzman, Alejandra

2008-05-01T23:59:59.000Z

395

A Mean Field Analysis of the Exchange Coupling (J) For 2- and 3-D Structured Tetracyanoethylenide (TCNE -)-based Magnets  

SciTech Connect

Mean field expressions based on the simple Heisenberg model were derived to correlate the inter- and intralayer exchange coupling to the critical temperatures, Tc, for several TCNE (tetracyanoethylene) based magnets with extended 2- and 3-D structure types. These expressions were used to estimate the exchange coupling, J, for 2-D ferrimagnetic [MII(TCNE)(NCMe)2]+ (M = Mn, Fe), 3-D antiferromagnetic MnII(TCNE)[C4(CN)8]1/2, and 3-D ferrimagnetic MnII(TCNE)3/2(I3)1/2. The sign and magnitude of the exchange coupling are in accord with previously reported magnetic data.

McConnell, Amber C. [University of Utah; Fishman, Randy Scott [ORNL; Miller, Joel S. [University of Utah

2012-01-01T23:59:59.000Z

396

Ultrahigh and High Resolution Structures and Mutational Analysis of Monomeric Streptococcus pyogenes SpeB Reveal a Functional Role for the Glycine-rich C-terminal Loop  

Science Conference Proceedings (OSTI)

Cysteine protease SpeB is secreted from Streptococcus pyogenes and has been studied as a potential virulence factor since its identification almost 70 years ago. Here, we report the crystal structures of apo mature SpeB to 1.06 {angstrom} resolution as well as complexes with the general cysteine protease inhibitor trans-epoxysuccinyl-L-leucylamido(4-guanidino)butane and a novel substrate mimetic peptide inhibitor. These structures uncover conformational changes associated with maturation of SpeB from the inactive zymogen to its active form and identify the residues required for substrate binding. With the use of a newly developed fluorogenic tripeptide substrate to measure SpeB activity, we determined IC{sub 50} values for trans-epoxysuccinyl-L-leucylamido(4-guanidino)butane and our new peptide inhibitor and the effects of mutations within the C-terminal active site loop. The structures and mutational analysis suggest that the conformational movements of the glycine-rich C-terminal loop are important for the recognition and recruitment of biological substrates and release of hydrolyzed products.

González-Páez, Gonzalo E.; Wolan, Dennis W. (Scripps)

2012-09-05T23:59:59.000Z

397

Application of high-energy x-rays and pair-distribution-function analysis to nano-scale structural studies in catalysis.  

SciTech Connect

We investigate the structure of supported Pt catalysts using high-energy X-ray scattering coupled with Pair-Distribution-Function (PDF) analysis. Recently, experimental approaches that enable the collection of PDF data in situ have been developed with time-resolution sufficient to study the structure of Pt nano-particles as they form. The differential PDF approach is utilized which allows the atom-atom correlations involving only Pt to be selectively recovered, enabling structural investigation of the supported particles and the mechanism of their formation. In parallel to the in situ analysis, we have examined samples prepared ex situ. Data collected on the ex situ samples show that the initial deposition of Pt{sup 4+} occurs as the PtCl{sub 6}{sup 2-} species which are retained even when annealed in an oxygen atmosphere. The Pt differential PDFs of the samples reduced in hydrogen at 200 and 500 C indicated nano-crystalline face-centered-cubic (fcc) metallic Pt particles. The ex situ reduced samples also contain a weak correlations at 2.1 {angstrom}, which we assign to Pt-O interactions between the particles and the support surface. The in situ experiments, following the reduction of Pt{sup 4+} from 0 to 227 C, indicate that the initial Pt nano-particles formed are ca. 1 nm in size, and become larger and more crystalline by 200 C. The data suggest a particle growth mechanism where the initial particles that form are small (<1 nm), then agglomerate into ensembles of many small particles and lastly anneal to form larger well-ordered particles. Lastly, we discus potential future developments in operando PDF studies, and identify opportunities for synchronous application of complementary methods.

Chupas, P. J.; Chapman, K. W.; Chen, H.; Grey, C.; X-Ray Science Division; State Univ. of New York

2009-07-30T23:59:59.000Z

398

Market structure and the price of electricity: An ex ante analysis of the deregulated Swedish electricity market  

Science Conference Proceedings (OSTI)

Following new legislation the Swedish electricity market is about to be deregulated. The new system is designed to ensure competition in production and supply. The main motive for deregulation is to increase competition and thus achieve lower market prices. A possible threat to this outcome is the high degree of concentration on the seller side that characterizes the Swedish electricity market. In this paper we show that given the current structure of firms on the supply side, deregulation is not a sufficient condition for lower equilibrium prices in the electricity market. We use a numerical model to explore the quantitative relation between the Cournot-equilibrium price, the number of firms, and the size distribution of firms in the Swedish electricity market. We compute equilibrium electricity prices and a welfare measure in order to quantify the effect of asymmetric market concentration on competition. 3 refs., 1 fig., 6 tabs.

Andersson, B.; Bergman, L. [Stockholm School of Economics (Sweden)

1995-12-31T23:59:59.000Z

399

Structure and Evolution of a Long-Lived, Microburst-Producing Storm  

Science Conference Proceedings (OSTI)

This paper describes an analysis of a long-lived, microburst-producing storm that evolved within a relatively dry environment having a relatively low CAPE value of 450 J kg?1. The storm displayed a variety of kinematic and echo formations over ...

Kevin R. Knupp

1996-12-01T23:59:59.000Z

400

Structural and Functional Analysis of the Interaction Between the Nucleoporin Nup214 and the DEAD-box Helicase Ddx19  

Science Conference Proceedings (OSTI)

Key steps in the export of mRNA from the nucleus to the cytoplasm are the transport through the nuclear pore complex (NPC) and the subsequent remodeling of messenger RNA-protein (mRNP) complexes that occurs at the cytoplasmic side of the NPC. Crucial for these events is the recruitment of the DEAD-box helicase Ddx19 to the cytoplasmic filaments of the NPC that is mediated by the nucleoporin Nup214. Here, we present the crystal structure of the Nup214 N-terminal domain in complex with Ddx19 in its ADP-bound state at 2.5 {angstrom} resolution. Strikingly, the interaction surfaces are not only evolutionarily conserved but also exhibit strongly opposing surface potentials, with the helicase surface being positively and the Nup214 surface being negatively charged. We speculate that the positively charged surface of the interacting ADP-helicase binds competitively to a segment of mRNA of a linearized mRNP, passing through the NPC on its way to the cytoplasm. As a result, the ADP-helicase would dissociate from Nup214 and replace a single bound protein from the mRNA. One cycle of protein replacement would be accompanied, cooperatively, by nucleotide exchange, ATP hydrolysis, release of the ADP-helicase from mRNA and its rebinding to Nup214. Repeat of these cycles would remove proteins from a mRNP, one at a time, akin to a ratchet mechanism for mRNA export.

Napetschnig, J.; Kassube, S; Debler, E; Wong, R; Blobel, G; Hoelz, A

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "kinematic structural analysis" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

THE KINEMATICS OF LATE-TYPE STARS IN THE SOLAR CYLINDER STUDIED WITH SDSS DATA  

Science Conference Proceedings (OSTI)

We study the velocity distribution of Milky Way disk stars in a kiloparsec-sized region around the Sun, based on {approx}2 million M-type stars from DR7 of SDSS, which have newly re-calibrated absolute proper motions from combining SDSS positions with the USNO-B catalogue. We estimate photometric distances to all stars, accurate to {approx}20%, and combine them with the proper motions to derive tangential velocities for this kinematically unbiased sample of stars. Based on a statistical deprojection method we then derive the vertical profiles (to heights of Z = 800 pc above the disk plane) for the first and second moments of the three-dimensional stellar velocity distribution. We find that (W) = -7 {+-} 1 km s{sup -1} and (U) = -9 {+-} 1 km s{sup -1}, independent of height above the mid-plane, reflecting the Sun's motion with respect to the local standard of rest. In contrast, (V) changes distinctly from -20 {+-} 2 km s{sup -1} in the mid-plane to (V) = -32 km s{sup -1} at Z = 800 pc, reflecting an asymmetric drift of the stellar mean velocity that increases with height. All three components of the M-star velocity dispersion show a strong linear rise away from the mid-plane, most notably {sigma} {sub ZZ}, which grows from 18 km s{sup -1} (Z = 0) to 40 km s{sup -1} (at Z = 800 pc). We determine the orientation of the velocity ellipsoid, and find a significant vertex deviation of 20{sup 0}-25{sup 0}, which decreases only slightly to heights of Z = 800 pc. Away from the mid-plane, our sample exhibits a remarkably large tilt of the velocity ellipsoid toward the Galactic plane, which reaches 20{sup 0} at Z = 800 pc and which is not easily explained. Finally, we determine the ratio {sigma}{sup 2} {sub {phi}}{sub {phi}}/{sigma}{sup 2} {sub RR} near the mid-plane, which in the epicyclic approximation implies an almost perfectly flat rotation curve at the solar radius.

Fuchs, Burkhard; Dettbarn, Christian; Jahreiss, Hartmut [Astronomisches Rechen-Institut am Zentrum fuer Astronomie der Universitaet Heidelberg, 69120 Heidelberg (Germany); Rix, Hans-Walter; Klement, Rainer [Max-Planck-Institut fuer Astronomie, 69117 Heidelberg (Germany); Beers, Timothy C. [Department of Physics and Astronomy, CSCE: Center for the Study of Cosmic Evolution, and JINA: Joint Institute for Nuclear Astrophysics, Michigan State University, E. Lansing, MI 48824 (United States); Bizyaev, Dmitry; Brewington, Howard; Malanushenko, Elena; Malanushenko, Viktor; Oravetz, Dan; Pan, Kaike; Simmons, Audrey; Snedden, Stephanie [Apache Point Observatory, Sunspot, NM 88349 (United States)

2009-05-15T23:59:59.000Z

402

Failure Analysis of Titanium Dental Implants  

Science Conference Proceedings (OSTI)

Analysis of a Bucketwheel Stacker Reclaimer Structural Failure · Analysis of Glass Breakage · Analysis of Sealed, Integrated, Automotive Wheel Bearings.

403

X-ray diffraction analysis and scanning micro-Raman spectroscopy of structural irregularities and strains deep inside the multilayered InGaN/GaN heterostructure  

SciTech Connect

High-resolution X-ray diffraction analysis and scanning confocal Raman spectroscopy are used to study the spatial distribution of strains in the In{sub x}Ga{sub 1-x}N/GaN layers and structural quality of these layers in a multilayered light-emitting diode structure produced by metal-organic chemical vapor deposition onto (0001)-oriented sapphire substrates. It is shown that elastic strains almost completely relax at the heterointerface between the thick GaN buffer layer and In{sub x}Ga{sub 1-x}N/GaN buffer superlattice. It is established that the GaN layers in the superlattice are in a stretched state, whereas the alloy layers are in a compressed state. In magnitude, the stretching strains in the GaN layers are lower than the compressive strains in the InGaN layers. It is shown that, as compared to the buffer layers, the layers of the superlattice contain a smaller number of dislocations and the distribution of dislocations is more randomly disordered. In micro-Raman studies on scanning through the thickness of the multilayered structure, direct evidence is obtained for the asymmetric gradient distributions of strains and crystal imperfections of the epitaxial nitride layers along the direction of growth. It is shown that the emission intensity of the In{sub x}Ga{sub 1-x}N quantum well is considerably (more than 30 times) higher than the emission intensity of the GaN barrier layers, suggesting the high efficiency of trapping of charge carriers by the quantum well.

Strelchuk, V. V., E-mail: Strelch@isp.kiev.ua; Kladko, V. P.; Avramenko, E. A.; Kolomys, O. F.; Safryuk, N. V.; Konakova, R. V. [National Academy of Sciences of Ukraine, Lashkaryov Institute of Semiconductor Physics (Ukraine); Yavich, B. S., E-mail: byavich@soptel.ru [ZAO Svetlana-Optoelectronics (Russian Federation); Valakh, M. Ya.; Machulin, V. F.; Belyaev, A. E. [National Academy of Sciences of Ukraine, Lashkaryov Institute of Semiconductor Physics (Ukraine)

2010-09-15T23:59:59.000Z

404

THE 21 cm 'OUTER ARM' AND THE OUTER-GALAXY HIGH-VELOCITY CLOUDS: CONNECTED BY KINEMATICS, METALLICITY, AND DISTANCE  

Science Conference Proceedings (OSTI)

Using high-resolution ultraviolet spectra obtained with the Hubble Space Telescope Space Telescope Imaging Spectrograph and the Far Ultraviolet Spectroscopic Explorer, we study the metallicity, kinematics, and distance of the gaseous 'outer arm' (OA) and the high-velocity clouds (HVCs) in the outer Galaxy. We detect the OA in a variety of absorption lines toward two QSOs, H1821+643 and HS0624+6907. We search for OA absorption toward eight Galactic stars and detect it in one case, which constrains the OA Galactocentric radius to 9 kpc absorption toward two stars; Complex G is therefore in the same region at R{sub G} = 8-10 kpc. HVC Complex C is known to be at a similar Galactocentric radius. Toward H1821+643, the low-ionization absorption lines are composed of multiple narrow components, indicating the presence of several cold clouds and rapid cooling and fragmentation. Some of the highly ionized gas is also surprisingly cool. Accounting for ionization corrections, we find that the OA metallicity is Z = 0.2-0.5 Z{sub Sun }, but nitrogen is underabundant and some species are possibly mildly depleted by dust. The similarity of the OA metallicity, Galactocentric location, and kinematics to those of the adjacent outer-Galaxy HVCs, including high velocities that are not consistent with Galactic rotation, suggests that the OA and outer-Galaxy HVCs could have a common origin.

Tripp, Todd M.; Song Limin, E-mail: tripp@astro.umass.edu [Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States)

2012-02-20T23:59:59.000Z

405

Extreme Gas Kinematics in the z=2.2 Powerful Radio Galaxy MRC1138-262: Evidence for Efficient AGN Feedback in the Early Universe?  

SciTech Connect

To explain the properties of the most massive low-redshift galaxies and the shape of their mass function, recent models of galaxy evolution include strong AGN feedback to complement starburst-driven feedback in massive galaxies. Using the near-infrared integral-field spectrograph SPIFFI on the VLT, we searched for direct evidence for such a feedback in the optical emission line gas around the z = 2.16 powerful radio galaxy MRC1138-262, likely a massive galaxy in formation. The kpc-scale kinematics, with FWHMs and relative velocities {approx}< 2400 km s{sup -1} and nearly spherical spatial distribution, do not resemble large-scale gravitational motion or starburst-driven winds. Order-of-magnitude timescale and energy arguments favor the AGN as the only plausible candidate to accelerate the gas, with a total energy injection of {approx} few x 10{sup 60} ergs or more, necessary to power the outflow, and relatively efficient coupling between radio jet and ISM. Observed outflow properties are in gross agreement with the models, and suggest that AGN winds might have a similar, or perhaps larger, cosmological significance than starburst-driven winds, if MRC1138-262 is indeed archetypal. Moreover, the outflow has the potential to remove significant gas fractions ({approx}< 50%) from a > L* galaxy within a few 10 to 100 Myrs, fast enough to preserve the observed [{alpha}/Fe] overabundance in massive galaxies at low redshift. Using simple arguments, it appears that feedback like that observed in MRC1138-262 may have sufficient energy to inhibit material from infalling into the dark matter halo and thus regulate galaxy growth as required in some recent models of hierarchical structure formation.

Nesvadba, N H; Lehnert, M D; Eisenhauer, F; Gilbert, A M; Tecza, M; Abuter, R

2007-06-26T23:59:59.000Z

406

Structural and Functional Analysis of Sulfolobus solfataricus Y-Family DNA Polymerase Dpo4-Catalyzed Bypass of the Malondialdehyde?Deoxyguanosine Adduct  

Science Conference Proceedings (OSTI)

Oxidative stress can induce the formation of reactive electrophiles, such as DNA peroxidation products, e.g., base propenals, and lipid peroxidation products, e.g., malondialdehyde. Base propenals and malondialdehyde react with DNA to form adducts, including 3-(2'-deoxy-{beta}-d-erythro-pentofuranosyl)pyrimido[1,2-{alpha}]purin-10(3H)-one (M{sub 1}dG). When paired opposite cytosine in duplex DNA at physiological pH, M{sub 1}dG undergoes ring opening to form N{sup 2}-(3-oxo-1-propenyl)-dG (N{sup 2}-OPdG). Previous work has shown that M{sub 1}dG is mutagenic in bacteria and mammalian cells and that its mutagenicity in Escherichia coli is dependent on induction of the SOS response, indicating a role for translesion DNA polymerases in the bypass of M{sub 1}dG. To probe the mechanism by which translesion polymerases bypass M{sub 1}dG, kinetic and structural studies were conducted with a model Y-family DNA polymerase, Dpo4 from Sulfolobus solfataricus. The level of steady-state incorporation of dNTPs opposite M{sub 1}dG was reduced 260-2900-fold and exhibited a preference for dATP incorporation. Liquid chromatography-tandem mass spectrometry analysis of the full-length extension products revealed a spectrum of products arising principally by incorporation of dC or dA opposite M{sub 1}dG followed by partial or full-length extension. A greater proportion of -1 deletions were observed when dT was positioned 5' of M{sub 1}dG. Two crystal structures were determined, including a 'type II' frameshift deletion complex and another complex with Dpo4 bound to a dC-M{sub 1}dG pair located in the postinsertion context. Importantly, M{sub 1}dG was in the ring-closed state in both structures, and in the structure with dC opposite M{sub 1}dG, the dC residue moved out of the Dpo4 active site, into the minor groove. The results are consistent with the reported mutagenicity of M{sub 1}dG and illustrate how the lesion may affect replication events.

Eoff, Robert L.; Stafford, Jennifer B.; Szekely, Jozsef; Rizzo, Carmelo J.; Egli, Martin; Guengerich, F. Peter; Marnett, Lawrence J.; (Vanderbilt)

2010-01-12T23:59:59.000Z

407

Kinematic Properties of Wave Amplitude Vacillation in a Thermally Driven Rotating Fluid  

Science Conference Proceedings (OSTI)

Empirical evidence is presented to the effect that amplitude vacillation in a thermally driven rotating annulus of fluid is due primarily to the interference of two modes with the same azimuthal wavenumber and different vertical structures and ...

George Buzyna; Richard L. Pfeffer; Robin Kung

1989-09-01T23:59:59.000Z

408

Kinematics of Eddy–Mean Flow Interaction in an Idealized Atmospheric Model  

Science Conference Proceedings (OSTI)

The authors analyze atmospheric variability simulated in a two-layer baroclinic ?-channel quasigeostrophic model by combining Eulerian and feature-tracking analysis approaches. The leading mode of the model's low-frequency variability (LFV) is ...

Sergey Kravtsov; Sergey K. Gulev

2013-08-01T23:59:59.000Z

409

KINEMATICS AND CHEMISTRY OF STARS ALONG THE SAGITTARIUS TRAILING TIDAL TAIL AND CONSTRAINTS ON THE MILKY WAY MASS DISTRIBUTION  

Science Conference Proceedings (OSTI)

We present three-dimensional (3D) kinematics of Sagittarius (Sgr) trailing tidal debris in six fields located 70 Degree-Sign -130 Degree-Sign along the stream from the Sgr dwarf galaxy core. The data are from our proper-motion (PM) survey of Kapteyn's Selected Areas, in which we have measured accurate PMs to faint magnitudes in {approx}40' Multiplication-Sign 40' fields evenly spaced across the sky. The radial velocity (RV) signature of Sgr has been identified among our follow-up spectroscopic data in four of the six fields and combined with mean PMs of spectroscopically confirmed members to derive space motions of Sgr debris based on {approx}15-64 confirmed stream members per field. These kinematics are compared to predictions of the Law and Majewski model of Sgr disruption; we find reasonable agreement with model predictions in RVs and PMs along Galactic latitude. However, an upward adjustment of the local standard of rest velocity ({Theta}{sub LSR}) from its standard 220 km s{sup -1} to at least 232 {+-} 14 km s{sup -1} (and possibly as high as 264 {+-} 23 km s{sup -1}) is necessary to bring 3D model debris kinematics and our measurements into agreement. Satisfactory model fits that simultaneously reproduce known position, distance, and RV trends of the Sgr tidal streams, while significantly increasing {Theta}{sub LSR}, could only be achieved by increasing the Galactic bulge and disk mass while leaving the dark matter halo fixed to the best-fit values from Law and Majewski. We derive low-resolution spectroscopic abundances along this stretch of the Sgr stream and find a constant [Fe/H] {approx} -1.15 (with {approx}0.5 dex scatter in each field-typical for dwarf galaxy populations) among the four fields with reliable measurements. A constant metallicity suggests that debris along the {approx}60 Degree-Sign span of this study was all stripped from Sgr on the same orbital passage.

Carlin, Jeffrey L.; Majewski, Steven R.; Patterson, Richard J. [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 (United States); Casetti-Dinescu, Dana I.; Girard, Terrence M. [Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States); Law, David R., E-mail: jc4qn@mail.astro.virginia.edu, E-mail: carlij@rpi.edu [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)

2012-01-01T23:59:59.000Z

410

Local and average structures of the spin-glass pyrochlore Y2Mo2O7 from neutron diffraction and neutron pair distribution function analysis  

Science Conference Proceedings (OSTI)

The observation of canonical spin-glass behavior in the pyrochlore oxide Y{sub 2}Mo{sub 2}O{sub 7} has been a subject of considerable interest as the original structural studies were interpreted in terms of a well-ordered crystallographic model. It is widely held that the stabilization of the spin-glass state requires some level of positional disorder along with frustration. Recent reports from local probe measurements, extended x-ray-absorption fine structure (EXAFS) and {sup 89}Y NMR, have been interpreted in terms of disorder involving the Mo-Mo distances (EXAFS) and multiple Y sites (NMR). This work reports results from temperature-dependent (15--300 K) neutron diffraction (ND) and neutron pair distribution function studies which can provide from the same data set information on both the average and local structures. The principal findings are that: (1) there is no crystallographic phase transition over the temperature region studied within the resolution of the ND data; (2) the diffraction data are well fitted using a fully ordered model but with large and anisotropic displacement parameters for three of the four atomic sites; (3) the pairwise real-space correlation function G(r) shows clear evidence that the principal source of disorder is associated with the Y-O1 atom pairs rather than the Mo-Mo pairs, in disagreement with the interpretation of the EXAFS results; (4) fits to the G(r) improve significantly when anisotropic displacements for all sites are included; (5) inclusion of a split-site position parameter for O1 improves, slightly, both the G(r) fits and the Rietveld fits to the ND data; and (6) for all models the fits become worse as the temperature decreases and as the fitting range decreases. These results are qualitatively consistent with the {sup 89}Y NMR observations and perhaps recent muon-spin-relaxation studies. The issue of static versus dynamic disorder is not resolved, definitively. An estimate of the distribution of exchange constants due to the disorder is made using spin-dimer analysis and compared with the Saunders-Chalker model for the generation of spin-glass behavior from 'weak' disorder on geometrically frustrated lattices.

Proffen, Thomas Ernst [Los Alamos National Laboratory; Kim, Hyunjeong [Los Alamos National Laboratory; Greedan, John [MCMASTER UNIV; Gout, Delphine [ORNL; Lozano - Gorrin, A D [MCMASTER UNIV; Derahkshan, Shahab [MCMASTER UNIV; Bozin, E [COLUMBIA UNIV; Billinge, S J L [COLUMBIA UNIV

2009-01-01T23:59:59.000Z

411

A stochastic kinematic model of class averaging in single-particle electron microscopy  

Science Conference Proceedings (OSTI)

Single-particle electron microscopy is an experimental technique that is used to determine the three-dimensional (3D) structure of biological macromolecules and the complexes that they form. In general, image processing techniques and reconstruction ... Keywords: Class average, convolution, image alignment, single-particle electron microscopy

Wooram Park; Charles R Midgett; Dean R Madden; Gregory S Chirikjian

2011-05-01T23:59:59.000Z

412

Analysis of the GaInP/GaAs/1-eV/Ge Cell and Related Structures for Terrestrial Concentrator Application: Preprint  

DOE Green Energy (OSTI)

This conference paper describes the analysis of the potential of GaInP/GaAs/1-eV/Ge four-junction solar cell to improve on the efficiency of the state-of-the-art GaInP/GaAs/Ge benchmark. We emphasize three factors: (1) The newly proposed terrestrial concentrator spectrum has a lower ratio of red to blue light than does the old AM1.5 direct standard spectrum. (2) Standard two-layer antireflection coatings do not provide near-zero reflectance over the full spectral range of interest for these devices. (3) GaInNAs junctions used to date for the 1-eV junction have quantum efficiencies less than {approx}75%. These factors all limit the device current, adversely affecting the four-junction efficiency. We discuss strategies for ameliorating this problem, including going to alternate structures such as a GaInP/GaAs/0.9-eV three-junction device.

Friedman, D. J.; Kurtz, S. R.; Geisz, J. F.

2002-05-01T23:59:59.000Z

413

Isotopic Yield Distributions of Transfer- and Fusion-Induced Fission from 238U+12C Reactions in Inverse Kinematics  

E-Print Network (OSTI)

A novel method to access the complete identification in atomic number Z and mass A of fragments produced in low-energy fission of actinides is presented. This method, based on the use of multi- nucleon transfer and fusion reactions in inverse kinematics, is applied in this work to reactions between a 238U beam and a 12C target to produce and induce fission of moderately excited actinides. The fission fragments are detected and fully identified with the VAMOS spectrometer of GANIL, allowing the measurement of fragment yields of several hundreds of isotopes in a range between A ~ 80 and ~ 160, and from Z ~ 30 to ~ 64. For the first time, complete isotopic yield distributions of fragments from well-defined fissioning systems are available. Together with the precise measurement of the fragment emission angles and velocities, this technique gives further insight into the nuclear-fission process.

M. Caamaño; O. Delaune; F. Farget; X. Derkx; K. -H. Schmidt; L. Audouin; C. -O. Bacri; G. Barreau; J. Benlliure; E. Casarejos; A. Chbihi; B. Fernandez-Dominguez; L. Gaudefroy; C. Golabek; B. Jurado; A. Lemasson; A. Navin; M. Rejmund; T. Roger; A. Shrivastava; C. Schmitt

2013-04-09T23:59:59.000Z

414

data structure  

Science Conference Proceedings (OSTI)

Definition of data structure, possibly with links to more information and implementations. NIST. data structure. (definition). ...

2013-11-08T23:59:59.000Z

415

THE LUMINOSITY PROFILE AND STRUCTURAL PARAMETERS OF THE ANDROMEDA GALAXY  

Science Conference Proceedings (OSTI)

We have constructed an extended composite luminosity profile for the Andromeda galaxy, M31, and have decomposed it into three basic luminous structural components: a bulge, a disk, and a halo. The dust-free Spitzer/Infrared Array Camera (IRAC) imaging and extended spatial coverage of ground-based optical imaging and deep star counts allow us to map M31's structure from its center to 22 kpc along the major axis. We apply, and address the limitations of, different decomposition methods for the one-dimensional luminosity profiles and two-dimensional images. These methods include nonlinear least-squares and Bayesian Monte Carlo Markov chain analyses. The basic photometric model for M31 has a Sersic bulge with shape index n {approx_equal} 2.2 {+-} .3 and effective radius R{sub e} = 1.0 {+-} 0.2 kpc, and a dust-free exponential disk of scale length R{sub d} = 5.3 {+-} .5 kpc; the parameter errors reflect the range between different decomposition methods. Despite model covariances, the convergence of solutions based on different methods and current data suggests a stable set of structural parameters. The ellipticities ({epsilon} = 1 - b/a) of the bulge and the disk from the IRAC image are 0.37 {+-} 0.03 and 0.73 {+-} 0.03, respectively. The bulge parameter n is rather insensitive to bandpass effects and its value (2.2) suggests a first rapid formation via mergers followed by secular growth from the disk. The M31 halo has a two-dimensional power-law index {approx_equal} - 2.5 {+-} 0.2 (or -3.5 in three-dimensional), comparable to that of the Milky Way. We find that the M31 bulge light is mostly dominant over the range R{sub min} {approx} 9 kpc. The stellar nucleus, bulge, disk, and halo components each contribute roughly 0.05%, 23%, 73%, and 4% of the total light of M31 out to 200 kpc along the minor axis. Nominal errors for the structural parameters of the M31 bulge, disk, and halo amount to 20%. If M31 and the Milky Way are at all typical, faint stellar halos should be routinely detected in galaxy surveys reaching below {mu}{sub i} {approx_equal} 27 mag arcsec{sup -2}. We stress that our results rely on this photometric analysis alone. Structural parameters may change when other fundamental constraints, such as those provided by abundance gradients and stellar kinematics, are considered simultaneously.

Courteau, Stephane; Widrow, Lawrence M. [Department of Physics, Engineering Physics and Astronomy, Queen's University, Kingston, Ontario (Canada); McDonald, Michael [Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA (United States); Guhathakurta, Puragra [UCO/Lick Observatory and Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA (United States); Gilbert, Karoline M. [Department of Astronomy, University of Washington, Seattle, WA (United States); Zhu Yucong [Harvard/Center for Astrophysics, Cambridge, MA (United States); Beaton, Rachael Lynn; Majewski, Steven R., E-mail: courteau@astro.queensu.ca, E-mail: widrow@astro.queensu.ca, E-mail: mcdonald@space.mit.edu, E-mail: raja@ucolick.org, E-mail: kgilbert@astro.washington.edu, E-mail: yzhu@cfa.harvard.edu, E-mail: rlb9n@mail.astro.virginia.edu, E-mail: srm4n@virginia.edu [Department of Astronomy, University of Virginia, Charlottesville, VA (United States)

2011-09-20T23:59:59.000Z

416

DEEP: Pre-DEIMOS Surveys to I 24 of Galaxy Evolution and Kinematics  

E-Print Network (OSTI)

galaxies with the Keck Telescopes. The scienti#12;c goals include exploring galaxy formation and evolution key area has been rotation curve studies of distant spirals, as reviewed by N. Vogt-resolution data from 8-10 m class telescopes provide three powerful diagnostics for the analysis of distant

417

Design of Minimally Actuated Legged Milli-Robots Using Compliant Mechanisms and Folding  

E-Print Network (OSTI)

and analysis software can be helpful in the kinematic design process, and finite element software is useful for ensuring that structural loads

Hoover, Aaron Murdock

2010-01-01T23:59:59.000Z

418

Analysis of the rotational structure in the high-resolution infrared spectra of cis,cis- and trans,trans-1,4-difluorobutadiene-1-d1 and trans,trans-1,4-difluorobutadiene-1,4-d2  

SciTech Connect

Samples of cis,cis- and trans,trans-1,4-difluorobutadiene-1- d1 and of trans,trans-1,4-difluorobutadiene-1,4-d2 have been synthesized, and high-resolution (?0.0018 cm-1) infrared spectra of these substances have been recorded in the gas phase. Analysis of the rotational structure, mostly in C-type bands, has yielded ground state rotational constants. For the two 1-d1 species more than one band has been analyzed. For the 1,4-d2 species only one band was available for analysis. However, good agreement between the experimental centrifugal distortion constants and those predicted with a B3LYP/cc-pVTZ model give strong support to the analysis of the very dense spectrum. The ground state rotational constants are a contribution to finding semiexperimental equilibrium structures of the two nonpolar isomers of 1,4- difluorobutadiene.

Craig, Norman C.; Chen, Yihui; Lu, Yuhua; Neese, Christopher F.; Nemchick, Deacon J.; Blake, Thomas A.

2013-06-01T23:59:59.000Z

419

Airframe Structural Integrity Programs (ASIP)  

Science Conference Proceedings (OSTI)

Table 2   USAF Aircraft Structural Integrity Program tasks...analysis Vibration analysis Flutter analysis Nuclear weapons effects analysis Non-nuclear weapons effects analysis Design development tests Task III Full-scale testing Static tests Durability tests Damage tolerance tests Flight and ground operations tests Sonic tests Flight vibration tests Flutter...

420

Heat Capacity Effects Associated with the Hydrophobic Hydration and Interaction of Simple Solutes: A Detailed Structural and Energetical Analysis Based on MD Simulations  

E-Print Network (OSTI)

We examine the SPCE and TIP5P water models to study heat capacity effects associated with the hydrophobic hydration and interaction of Xenon particles. We calculate the excess chemical potential for Xenon employing the Widom particle insertion technique. The solvation enthalpy and excess heat capacity is obtained from the temperature dependence of the chemical potentials and, alternatively, directly by Ewald summation, as well as a reaction field based method. All three different approaches provide consistent results. The reaction field method allows a separation of the individual components to the heat capacity of solvation into solute/solvent and solvent/solvent parts, revealing the solvent/solvent part as the dominating contribution. A detailed spacial analysis of the heat capacity of the water molecules around a pair of Xenon particles at different separations reveals that the enhanced heat capacity of the water molecules in the bisector plane between two Xenon atoms is responsible for the maximum of the heat capacity observed at the desolvation barrier, recently reported by Shimizu and Chan ({\\em J. Am. Chem. Soc.},{\\bf 123}, 2083--2084 (2001)). The about 60% enlarged heat capacity of water in the concave part of the joint Xenon-Xenon hydration shell is the result of a counterplay of strengthened hydrogen bonds and an enhanced breaking of hydrogen bonds with increasing temperature. Differences between the two models concerning the heat capacity in the Xenon-Xenon contact state are attributed to the different water model bulk heat capacities, and to the different spacial extension of the structure effect introduced by the hydrophobic particles. Similarities between the different states of water in the joint Xenon-Xenon hydration shell and the properties of stretched water are discussed.

Dietmar Paschek

2004-02-06T23:59:59.000Z

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421

STEREO QUADRATURE OBSERVATIONS OF THE THREE-DIMENSIONAL STRUCTURE AND DRIVER OF A GLOBAL CORONAL WAVE  

SciTech Connect

We present the first observations of a global coronal wave ('EIT wave') from the two STEREO satellites in quadrature. The wave's initiation site was at the disk center in STEREO-B and precisely on the limb in STEREO-A. These unprecedented observations from the STEREO Extreme Ultraviolet Imaging (EUVI) instruments enable us to gain insight into the wave's kinematics, initiation, and three-dimensional structure. The wave propagates globally over the whole solar hemisphere visible to STEREO-B with a constant velocity of {approx}263 +- 16 km s{sup -1}. From the two STEREO observations, we derive a height of the wave in the range of {approx}80-100 Mm. Comparison of the wave kinematics with the early phase of the erupting coronal mass ejection (CME) structure indicates that the wave is initiated by the CME lateral expansion, and then propagates freely with a velocity close to the fast magnetosonic speed in the quiet solar corona.

Kienreich, I. W.; Temmer, M.; Veronig, A. M., E-mail: ines.kienreich@uni-graz.a, E-mail: mat@igam.uni-graz.a, E-mail: asv@igam.uni-graz.a [Institute of Physics/IGAM, University of Graz, Universitaetsplatz 5, A-8010 Graz (Austria)

2009-10-01T23:59:59.000Z

422

Structure of unbound neutron-rich $^{9}$He studied using single-neutron transfer  

E-Print Network (OSTI)

The 8He(d,p) reaction was studied in inverse kinematics at 15.4A MeV using the MUST2 Si-CsI array in order to shed light on the level structure of 9He. The well known 16O(d,p)17O reaction, performed here in reverse kinematics, was used as a test to validate the experimental methods. The 9He missing mass spectrum was deduced from the kinetic energies and emission angles of the recoiling protons. Several structures were observed above the neutron-emission threshold and the angular distributions were used to deduce the multipolarity of the transitions. This work confirms that the ground state of 9He is located very close to the neutron threshold of 8He and supports the occurrence of parity inversion in 9He.

T. Al Kalanee; J. Gibelin; P. Roussel-Chomaz; N. Keeley; D. Beaumel; Y. Blumenfeld; B. Fernandez-DomÄ{\\pm}nguez; C. Force; L. Gaudefroy; A. Gillibert; J. Guillot; H. Iwasaki; S. Krupko; V. Lapoux; W. Mittig; X. Mougeot; L. Nalpas; E. Pollacco; K. Rusek; T. Roger; H. Savajols; N. De Séréville; S. Sidorchuk; D. Suzuki; I. Strojek; N. A. Orr

2013-09-05T23:59:59.000Z

423

Probing local structure in the yellow phosphor LaSr[subscript 2]AlO[subscript 5]:Ce[superscript 3+], by the maximum entropy method and pair distribution function analysis  

SciTech Connect

The compound LaSr{sub 2}AlO{sub 5} was recently introduced as a competitive Ce{sup 3+} host material for blue-pumped yellow phosphors for use in white light emitting diodes. A crucial feature of the crystal structure of LaSr{sub 2}AlO{sub 5} is that La, which is the host site for Ce{sup 3+}, is located in the 8h positions of the I4/mcm crystal structure, a site equally shared with Sr. While the average crystal structure of LaSr{sub 2}AlO{sub 5} as revealed by Rietveld analysis of laboratory and synchrotron X-ray diffraction data suggests nothing untoward, maximum entropy method analysis of the synchrotron X-ray data reveals the existence of conspicuous non-sphericity of the electron density. Pair distribution function analysis of the data suggests that despite their occupying the same crystallographic site, La and Sr possess distinct coordination environments, and the environment around La is more compact and regular than the environment suggested by the Rietveld refinement of the average structure. The absorption and emission from Ce{sup 3+} centers is controlled by the local coordination and symmetry, and the use of powerful new tools in unraveling details of these strengthens the rational search for new phosphors for solid state white lighting.

Im, Won Bin; Page, Katharine; DenBaars, Steven P.; Seshadri, Ram (UCSB); (LANL)

2011-08-04T23:59:59.000Z

424

Fine Structure of Cloud Droplet Concentration as Seen from the Fast-FSSP Measurements. Part I: Method of Analysis and Preliminary Results  

Science Conference Proceedings (OSTI)

A statistical analysis of a series of droplet arrival times measured by the Fast Forward-Scattering Spectrometer Probe (FSSP) during aircraft flights in cumulus clouds was conducted. The main purpose of the analysis was to determine whether ...

M. Pinsky; A. P. Khain

2001-08-01T23:59:59.000Z

425

Failure Analysis of Four Graphite Pump Seal Faces  

Science Conference Proceedings (OSTI)

Analysis of a Bucketwheel Stacker Reclaimer Structural Failure · Analysis of Glass Breakage · Analysis of Sealed, Integrated, Automotive Wheel Bearings.

426

Failure Analysis and Remaining Life Assessment of Methanol ...  

Science Conference Proceedings (OSTI)

Analysis of a Bucketwheel Stacker Reclaimer Structural Failure · Analysis of Glass Breakage · Analysis of Sealed, Integrated, Automotive Wheel Bearings.

427

The effect of incarceration rates on mate availability and its effect on the formation and structure of the African American family: a theoretical and empirical analysis.  

E-Print Network (OSTI)

??A number of scholars have argued that declining mate availability for African American women has had important consequences for family formation and family structure in… (more)

McGruder, Patricia Hollis

2012-01-01T23:59:59.000Z

428

Nonlinear behavior of reinforced concrete structures under seismic excitation  

E-Print Network (OSTI)

Exploring nonlinear behavior of structures through structural analysis software can be time and computer processing intensive especially with complicated structural models. This paper will explore the nonlinear behavior ...

Pires, Matthew Anthony

2013-01-01T23:59:59.000Z

429

Chemical evolution STRUCTURE OF GALAXIES  

E-Print Network (OSTI)

Outline Absorption Chemical evolution STRUCTURE OF GALAXIES 8. Absorption; chemical evolution Piet Piet van der Kruit, Kapteyn Astronomical Institute Absorption; chemical evolution #12;Outline Absorption Chemical evolution Outline Absorption Holmberg's analysis Analysis of Disney et al. Edge

Kruit, Piet van der

430

Flaring up: radio diagnostics of the kinematic, hydrodynamic and environmental properties of GRBs  

E-Print Network (OSTI)

The specific incidence of radio flares appears to be significantly larger than that of the prompt optical emission. This abundance, coupled with the reverse shock interpretation suggests that radio flares add a unique probe on the physics of GRB shocks. Motivated thus, we estimate the strength of the reverse shock expected for bursts in which multi-wavelength observations have allowed the physical parameters of the forward shock to be determined. We use all 6 bursts (980519, 990123, 990510, 991208, 991216, 000418) which are found to be adiabatic and thus predicted to have a strong reverse shock. We aim to constrain the hydrodynamic evolution of the reverse shock and the initial bulk Lorentz factor -- which we found to be between $10^{2}$ and $10^{3}$ and well above the lower limits derived from the requirement that gamma-ray bursts be optically thin to high-energy photons. In half of the cases we improve the description of the early afterglow lightcurves by adding a contribution from the reverse shock. Modelling of this early emission provides the opportunity to investigate the immediate surroundings of the burst. For 991216 and 991208, the expected $1/r^2$ density structure for a stellar wind is not compatible with the early afterglow lightcurves. Considering the radial range relevant to these GRBs, we discuss the conditions under which the inclusion of a wind termination shock may resolve the absence of a $1/r^2$ density profile.

A. M. Soderberg; E. Ramirez-Ruiz

2002-10-23T23:59:59.000Z

431

Improved radiative corrections to (e,e{sup '}p) experiments: Explicit treatment of kinematical corrections in multiphoton bremsstrahlung  

SciTech Connect

Radiative processes lead to important corrections to (e,e{sup '}p) experiments. While radiative corrections can be calculated exactly in QED and to a good accuracy also including hadronic corrections, these corrections cannot be included into data analyses to arbitrary orders exactly. Nevertheless consideration of multiphoton bremsstrahlung above the low-energy cutoff is important for many (e,e{sup '}p) experiments. To date, higher-order bremsstrahlung effects concerning electron scattering experiments have been implemented approximately by employing the soft-photon approximation (SPA). In this paper we propose a novel approach to multiphoton emission which partially removes the SPA from (e,e{sup '}p) experiments. In this combined approach one hard photon is treated exactly; and additional (softer) bremsstrahlung photons are taken into account resorting to the soft-photon approximation. This partial removal of the soft-photon approximation is shown to be relevant for the missing-energy distribution for several kinematic settings at MAMI and TJNAF energies.

Weissbach, Florian [GSI Helmholtzzentrum fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany); Departement fuer Physik, Universitaet Basel, CH-4056 Basel (Switzerland); Hencken, Kai [Departement fuer Physik, Universitaet Basel, CH-4056 Basel (Switzerland); ABB Schweiz AG, Corporate Research, CH-5405 Baden-Daettwil (Switzerland); Kiselev, Daniela [Departement fuer Physik, Universitaet Basel, CH-4056 Basel (Switzerland); Paul Scherrer Institut, CH-5232 Villigen (Switzerland); Trautmann, Dirk [Departement fuer Physik, Universitaet Basel, CH-4056 Basel (Switzerland)

2009-08-15T23:59:59.000Z

432

Program: Structural Performance Under Multi-Hazards  

Science Conference Proceedings (OSTI)

... derive lessons learned from disasters and failures ... hazard failure analysis, and disaster and failure ... heat transfer, and nonlinear structural response. ...

2013-01-03T23:59:59.000Z

433

Vertical Moist Thermodynamic Structure of the Madden–Julian Oscillation in Atmospheric Infrared Sounder Retrievals: An Update and a Comparison to ECMWF Interim Re-Analysis  

Science Conference Proceedings (OSTI)

The large-scale vertical moist thermodynamic structure of the Madden–Julian oscillation (MJO) was documented using the first 2.5 yr (2002–05) of version 4 atmospheric specific humidity and temperature profiles from the Atmospheric Infrared ...

Baijun Tian; Duane E. Waliser; Eric J. Fetzer; Yuk L. Yung

2010-12-01T23:59:59.000Z

434

Local chromatin structure of heterochromatin regulates repeated DNA stability, nucleolus structure, and genome integrity  

E-Print Network (OSTI)

Analysis of Drosophila chromatin structure in vivo. MethodsA. (2006). Changes in chromatin structure and mobility ineffect variegation and chromatin proteins. Bioessays 14,

Peng, Jamy C.

2007-01-01T23:59:59.000Z

435

Structure function monitor  

DOE Patents (OSTI)

Methods and apparatus for a structure function monitor provide for generation of parameters characterizing a refractive medium. In an embodiment, a structure function monitor acquires images of a pupil plane and an image plane and, from these images, retrieves the phase over an aperture, unwraps the retrieved phase, and analyzes the unwrapped retrieved phase. In an embodiment, analysis yields atmospheric parameters measured at spatial scales from zero to the diameter of a telescope used to collect light from a source.

McGraw, John T. (Placitas, NM); Zimmer, Peter C. (Albuquerque, NM); Ackermann, Mark R. (Albuquerque, NM)

2012-01-24T23:59:59.000Z

436

Composition Dependent Analysis of Raman Spectra in the Modified Boroaluminosilicate System: Implications for Coupling Between Structural Resonance and Relaxation in the Glass Network  

Science Conference Proceedings (OSTI)

The boroaluminosilicate system was systematically modified by addition of magnesium, sodium and zirconium oxides. Strong bridging silicate bands and narrow and intense nonbridging silicate bands compose the Raman spectra of glasses. The fundamental nonbridging molecular species bands are related to the bridged network bands by the first overtone and signify anharmonic oscillation. At a constant degree of depolymerisation, the nonbridging band intensity depends on the silica content. With decrease in silica content, the bridged network band frequency shifts to a higher value and simultaneously the nonbridging bands intensify. The sharp rise in intensity for the nonbridging bands is attributed to resonant oscillations between the bridged lattice network and nonbridging molecular species. The resonance between the two structural entities possibly occurs in response to relaxation of the bridged network with decrease in silica content. Contributions to enhancement of intensity also presumably arise from resonance in valency bonds and oscillations in the oxygen edge shared polyhedral (ESP) structure for the nonbridging molecular species. The force constant of the ESP species varies as a function of zirconium, sodium and magnesium coordination to apex nonbridging oxygens. The single ESP band transforms to Fermi doublet upon crystallisation to orthosilicate structures of zircon and forsterite. 32 refs.

S. V. Raman; R. S. Czernuszewicz; A. A. Zareba

2004-04-01T23:59:59.000Z

437

Shoreline monitoring program on the Upper Texas Coast utilizing a Real-Time Kinematic Differential Global Positioning System  

E-Print Network (OSTI)

Due to shoreline erosion, approximately seventeen miles of Texas State Highway 87, located in Jefferson County Texas, have been repeatedly destroyed by storms and rebuilt. This thesis describes a shoreline monitoring program developed to obtain a comprehensive data set that will be used to define the coastal erosion problem and assist in the reconstruction of the roadway. An improved survey system similar to a concept developed by Beach et al. (1996) was designed and constructed for this project. This thesis discusses the improved survey system design and testing. The nearshore system utilizes a Real-Time Kinematic Differential Global Positioning System (RTK-DGPS) mounted on a personal watercraft and integrated with a survey quality echo sounder. The nearshore system was tested by repeating transects in the nearshore. The repeatability of the profiles demonstrated a standard deviation of 6.2 cm from the mean absolute difference of 8.0 cm. The beach survey utilizes RTK-DGPS equipment carried by the surveyor in a backpack. The maximum expected error for the beach survey is approximately []4 cm. The system is an accurate, mobile and efficient method to obtain beach profiles. Additional accuracy may be obtained by integrating a motion sensor and CTD profiler. The survey data are processed using commercially available software packages and programs developed for this project. The processed data is integrated and stored in a geographic information system (GIS). The data collected exemplify morphological features indicative of erosion due to overwash. This is consistent with visual observations and numerical model results provided by Howard (1999). The shoreline movement since 1996 is consistent with historical data and is related to storm events. The current research has provided a survey system capable of performing fast, accurate surveys in the nearshore and a baseline data set. The survey system is fully operational and will be instrumental in the ongoing research related to the Highway 87 reconstruction project. The baseline data set, together with sediment analyses data and water level predictions, provides the foundation from which further investigations will be conducted and will provide information that can be used for the design of the new highway.

Wamsley, Ty V

2000-01-01T23:59:59.000Z

438

Visible structures  

E-Print Network (OSTI)

All architecture is the interplay between structure, surface and ornament. Traditionally, ornament adorned structure thereby giving it its meaning. A society with its intellectual foundations resting in faith or the abstract ...

Conway, Helene Marie

1991-01-01T23:59:59.000Z

439

The X-ray Crystallographic Structure and Activity Analysis of a Pseudomonas-Specific Subfamily of the HAD Enzyme Superfamily Evidences a Novel Biochemical Function  

Science Conference Proceedings (OSTI)

The haloacid dehalogenase (HAD) superfamily is a large family of proteins dominated by phosphotransferases. Thirty-three sequence families within the HAD superfamily (HADSF) have been identified to assist in function assignment. One such family includes the enzyme phosphoacetaldehyde hydrolase (phosphonatase). Phosphonatase possesses the conserved Rossmanniod core domain and a C1-type cap domain. Other members of this family do not possess a cap domain and because the cap domain of phosphonatase plays an important role in active site desolvation and catalysis, the function of the capless family members must be unique. A representative of the capless subfamily, PSPTO{_}2114, from the plant pathogen Pseudomonas syringae, was targeted for catalytic activity and structure analyses. The X-ray structure of PSPTO{_}2114 reveals a capless homodimer that conserves some but not all of the intersubunit contacts contributed by the core domains of the phosphonatase homodimer. The region of the PSPTO{_}2114 that corresponds to the catalytic scaffold of phosphonatase (and other HAD phosphotransfereases) positions amino acid residues that are ill suited for Mg+2 cofactor binding and mediation of phosphoryl group transfer between donor and acceptor substrates. The absence of phosphotransferase activity in PSPTO{_}2114 was confirmed by kinetic assays. To explore PSPTO{_}2114 function, the conservation of sequence motifs extending outside of the HADSF catalytic scaffold was examined. The stringently conserved residues among PSPTO{_}2114 homologs were mapped onto the PSPTO{_}2114 three-dimensional structure to identify a surface region unique to the family members that do not possess a cap domain. The hypothesis that this region is used in protein-protein recognition is explored to define, for the first time, HADSF proteins which have acquired a function other than that of a catalyst. Proteins 2008.

Peisach,E.; Wang, L.; Burroughs, A.; Aravind, L.; Dunaway-Mariano, D.; Allen, K.

2008-01-01T23:59:59.000Z

440

Structural Collapse  

Science Conference Proceedings (OSTI)

... areas. The living room and bedroom areas of each structure were ignited simultaneously using electric matches. Peak ...

2013-07-16T23:59:59.000Z

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441

Crystal structure of (Li{sub 0.5}K{sub 0.5}){sub 2}CO{sub 3} by neutron powder diffraction analysis  

DOE Green Energy (OSTI)

The crystal structure of (Li{sub 0.5}K{sub 0.5}){sub 2}CO{sub 3} was determined by neutron powder diffraction. A final weighted R-factor of 4.54% was obtained for the refinement of 2,373 reflections by the Rietveld method from a sample synthesized using {sup 7}Li{sub 2}CO{sub 3} and K{sub 2}CO{sub 3} (99.9% pure). Slight distortion of the CO{sub 3}{sup 2{minus}} units in the monoclinic cell was observed; the O(1)-C-O(2) angle and C-O(3) length are larger than those for the other C-O bonds and O-C-O angles. These local-structure characteristics can be explained by the difference in the ionic size of Li{sup +} and K{sup +}, and the different electrostatic interactions between the cations and CO{sub 3}{sup 2{minus}} units. (Li{sub 0.5}K{sub 0.5}){sub 2}CO{sub 3} is important as a material for molten carbonate fuel cells.

Idemoto, Yasushi [Argonne National Lab., IL (United States). Intense Pulsed Neutron Source]|[Science Univ. of Tokyo, Noda, Chiba (Japan). Dept. of Industrial Chemistry; Richardson, J.W. Jr.; Loong, C.K. [Argonne National Lab., IL (United States). Intense Pulsed Neutron Source; Koura, Nobuyuki; Kohara, Shinji [Science Univ. of Tokyo, Noda, Chiba (Japan). Dept. of Industrial Chemistry

1997-08-01T23:59:59.000Z

442

Structural characterization of Green River oil-shale at high-pressure using pair distribution function analysis and small angle x-ray scattering.  

Science Conference Proceedings (OSTI)

The compression behavior of a silicate-rich oil shale from the Green River formation in the pressure range 0.0-2.4 GPa was studied using in situ high pressure X-ray pair distribution function (PDF) measurements for the sample contained within a Paris-Edinburgh cell. The real-space local structural information in the PDF, G(r), was used to evaluate the compressibility of the oil shale. Specifically, the pressure-induced reduction in the medium- to long-range atom distances (6-20 {angstrom}) yielded an average sample compressibility corresponding to a bulk modulus of ca. 61-67 GPa. A structural model consisting of a three phase mixture of the principal crystalline oil shale components (quartz, albite and Illite) provided a good fit to the ambient pressure PDF data (R 30.7%). Indeed the features in the PDF beyond 6 {angstrom}, were similarly well fit by a single phase model of the highest symmetry, highly crystalline quartz component.

Locke, D. R.; Chupas, P. J.; Chapman, K. W.; Pugmire, R. J.; Winans, R. E.; Univ. of Utah

2008-01-01T23:59:59.000Z

443

Structure at Work: The Division of Labor in U.S. Wineries  

E-Print Network (OSTI)

analyze their causes. Our analysis of job structures in U.S.job structure among other farm wineries in the analysis ofthe causes of job structures. Our analysis adds to the

Havemen, Heather A.; Swaminathan, Anand; Johnson, Eric B.

2007-01-01T23:59:59.000Z

444