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1

Time-dependent seismic tomography and its application to the...  

Open Energy Info (EERE)

to the Coso geothermal area, 1996-2006 Abstract Measurements of temporal changes in Earth structure are commonly determined using local earthquake tomography computer programs...

2

Time-dependent seismic tomography and its application to the Coso  

Open Energy Info (EERE)

and its application to the Coso and its application to the Coso geothermal area, 1996-2006 Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Time-dependent seismic tomography and its application to the Coso geothermal area, 1996-2006 Details Activities (1) Areas (1) Regions (0) Abstract: Measurements of temporal changes in Earth structure are commonly determined using local earthquake tomography computer programs that invert multiple seismic-wave arrival time data sets separately and assume that any differences in the structural results arise from real temporal variations. This assumption is dangerous because the results of repeated tomography experiments would differ even if the structure did not change, simply because of variation in the seismic ray distribution caused by the natural

3

Time-Dependent Seismic Tomography of the Coso Geothermal Area, 1996-2004 |  

Open Energy Info (EERE)

Dependent Seismic Tomography of the Coso Geothermal Area, 1996-2004 Dependent Seismic Tomography of the Coso Geothermal Area, 1996-2004 Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Time-dependent seismic tomography of the Coso geothermal area, 1996-2004 Details Activities (1) Areas (1) Regions (0) Abstract: Local-earthquake tomographic images were calculated for each of the years 1996 - 2004 using arrival times from the U.S. Navy's permanent seismometer network at the Coso geothermal area, California. The results show irregular strengthening with time of the wave-speed ratio VP/VS at shallow depths. These changes result predominately from progressive relative increase in VS with respect to VP, and could result from processes associated with geothermal operations such as decrease in fluid pressure

4

Time-dependent seismic tomography of the Coso geothermal area, 1996-2004 |  

Open Energy Info (EERE)

of the Coso geothermal area, 1996-2004 of the Coso geothermal area, 1996-2004 Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Time-dependent seismic tomography of the Coso geothermal area, 1996-2004 Details Activities (1) Areas (1) Regions (0) Abstract: Local-earthquake tomographic images were calculated for each of the years 1996 - 2004 using arrival times from the U.S. Navy's permanent seismometer network at the Coso geothermal area, California. The results show irregular strengthening with time of the wave-speed ratio VP/VS at shallow depths. These changes result predominately from progressive relative increase in VS with respect to VP, and could result from processes associated with geothermal operations such as decrease in fluid pressure and the drying of argillaceous minerals such as illite.

5

Review paper Seismic interferometry and ambient noise tomography in the British Isles  

E-Print Network [OSTI]

Review paper Seismic interferometry and ambient noise tomography in the British Isles Heather. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 2. Theory and method of seismic interferometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 4.2. Seismic interferometry across the Scottish Highlands

6

Constraints on mantle convection from seismic tomography and flow modeling  

E-Print Network [OSTI]

In this thesis I combine high resolution seismic tomography and realistic flow modeling to constrain mantle convection. The bulk of the data used in the tomographic imaging are millions of P, pP and pwP travel time residuals, ...

Kárason, Hrafnkell, 1970-

2002-01-01T23:59:59.000Z

7

Investigating the stratigraphy of an alluvial aquifer using crosswell seismic traveltime tomography  

E-Print Network [OSTI]

can be used in situations where surface seismic reflection has failed e.g., Liberty et al., 1999Investigating the stratigraphy of an alluvial aquifer using crosswell seismic traveltime tomography In this study, we investigate the use of crosswell P-wave seismic tomography to obtain spatially extensive

Barrash, Warren

8

THE VALUE OF BOREHOLE -TO-SURFACE INFORMATION IN NEAR-SURFACE CROSSWELL SEISMIC TOMOGRAPHY  

E-Print Network [OSTI]

seismic reflection cannot (e.g. Liberty et al., 1999; Musil et al., 2002). The images producedTHE VALUE OF BOREHOLE -TO-SURFACE INFORMATION IN NEAR-SURFACE CROSSWELL SEISMIC TOMOGRAPHY Geoff J properties is important in many fields. One method that can image the seismic velocity structure

Barrash, Warren

9

Multi-Resolution Seismic Tomography Based on Recursive Tessellation Hierarchy  

SciTech Connect (OSTI)

A 3-D global tomographic model that reconstructs velocity structure at multiple scales and incorporates laterally variable seismic discontinuities is currently being developed. The model parameterization is node-based where nodes are placed along vertices defined by triangular tessellations of a spheroidal surface. The triangular tessellation framework is hierarchical. Starting with a tetrahexahedron representing the whole globe (1st level of the hierarchy, 24 faces), they divide each triangle of the tessellation into daughter triangles. The collection of all daughter triangles comprises the 2nd level of the tessellation hierarchy and further recursion produces an arbitrary number of tessellation levels and arbitrarily fine node-spacing. They have developed an inversion procedure that takes advantage of the recursive properties of the tessellation hierarchies by progressively solving for shorter wavelength heterogeneities. In this procedure, we first perform the tomographic inversion using a tessellation level with coarse node spacing. They find that a coarse node spacing of approximately 8{sup o} is adequate to capture bulk regional properties. They then conduct the tomographic inversion on a 4{sup o} tessellation level using the residuals and inversion results from the 8{sup o} run. In practice they find that the progressive tomography approach is robust, providing an intrinsic regularization for inversion stability and avoids the issue of predefining resolution levels. Further, determining average regional properties with coarser tessellation levels enables long-wavelength heterogeneities to account for sparsely sampled regions (or regions of the mantle where longer wavelength patterns of heterogeneity suffice) while allowing shorter length-scale heterogeneities to emerge where necessary. They demonstrate the inversion approach with a set of synthetic test cases that mimic the complex nature of data arrangements (mixed-determined inversion) common to most tomographic problems. They also apply the progressive inversion approach with Pn waves traveling within the Middle East region and compare the results to simple tomographic inversions. As expected from synthetic testing, the progressive approach results in detailed structure where there is high data density and broader regional anomalies where seismic information is sparse. The ultimate goal is to use these methods to produce a seamless, multi-resolution global tomographic model with local model resolution determined by the constraints afforded by available data. They envisage this new technique as the general approach to be employed for future multi-resolution model development with complex arrangements of regional and teleseismic information.

Simmons, N A; Myers, S C; Ramirez, A

2009-07-01T23:59:59.000Z

10

Surface-to-tunnel seismic tomography studies at Yucca Mountain, Nevada  

E-Print Network [OSTI]

Surface-to-tunnel seismic tomography studies at Yucca Mountain, Nevada Roland Gritto, Valeri A in the proposed nuclear waste repository area at Yucca Mountain, Nevada. A 5-km-long source line and a 3-km-long receiver line were located on top of Yucca Mountain ridge and inside the Exploratory Study Facility (ESF

Korneev, Valeri A.

11

Detecting Perched Water Bodies Using Surface-seismic Time-lapse Traveltime Tomography  

E-Print Network [OSTI]

Chapter 25 Detecting Perched Water Bodies Using Surface-seismic Time-lapse Traveltime Tomography remediation. Previous near-surface geophysical time-lapse studies have focused on electrical or electromagnetic (EM) techniques (including ground-penetrating radar) or borehole methods. To evaluate the utility

Hubbard, Susan

12

3-D seismic tomography of the Adelaide fold belt  

Science Journals Connector (OSTI)

......the major factor. Temperature-induced P-wave...which smoothes the temperature contrast, resulting...structure of the eastern Snake River Plain and its...1996. Upper mantle temperatures from teleseismic tomography...implications for regolith development, 3rd Australian Regolith......

Peter Clifford; Stewart Greenhalgh; Greg Houseman; Frank Graeber

2008-01-01T23:59:59.000Z

13

Using seismic tomography to characterize fracture systems induced by hydraulic fracturing  

SciTech Connect (OSTI)

Microearthquakes induced by hydraulic fracturing have been studied by many investigators to characterize fracture systems created by the fracturing process and to better understand the locations of energy resources in the earth`s subsurface. The pattern of the locations often contains a great deal of information about the fracture system stimulated during the hydraulic fracturing. Seismic tomography has found applications in many areas for characterizing the subsurface of the earth. It is well known that fractures in rock influence both the P and S velocities of the rock. The influence of the fractures is a function of the geometry of the fractures, the apertures and number of fractures, and the presence of fluids in the fractures. In addition, the temporal evolution of the created fracture system can be inferred from the temporal changes in seismic velocity and the pattern of microearthquake locations. Seismic tomography has been used to infer the spatial location of a fracture system in a reservoir that was created by hydraulic fracturing.

Fehler, M.; Rutledge, J.

1995-01-01T23:59:59.000Z

14

Three-dimensional seismic tomography with tetrahedra element on isoparametric mapping  

Science Journals Connector (OSTI)

The author has developed a method of three-dimensional seismic tomography on concrete structures. This method is based on ray-trace and identification technique, and the distribution of slowness or energy dissipation is identified based on simultaneously iterative reconstruction technique (SIRT) or the other kind of statistical identification technique. This kind of technique was originally developed for investigation of underground that is called geotomography, however, this technique was difficult to apply to concrete structures because the structures generally have irregular shape. A hexahedral element was implemented by the author to overcome this difficulty based on the idea of isoparametric mapping of hexahedral element on finite element analysis, however, it is still difficult to apply the method to the structures that have highly irregular shape. In this respect, an implementation of tetrahedral element is proposed for the three-dimensional seismic tomography on concrete structures to solve the difficulty in this paper. This implementation is based on the idea of isoparametric mapping as well as the case of hexahedral element and it enables to apply the method to structures of complex shape that is insufficient to represent by hexahedral elements. The validity of the proposed method is checked by some numerical example.

Yoshikazu Kobayashi

2012-01-01T23:59:59.000Z

15

Robust inverse scattering full waveform seismic tomography for imaging complex structure  

SciTech Connect (OSTI)

Seismic tomography becomes important tool recently for imaging complex subsurface. It is well known that imaging complex rich fault zone is difficult. In this paper, The application of time domain inverse scattering wave tomography to image the complex fault zone would be shown on this paper, especially an efficient time domain inverse scattering tomography and their run in cluster parallel computer which has been developed. This algorithm is purely based on scattering theory through solving Lippmann Schwienger integral by using Born's approximation. In this paper, it is shown the robustness of this algorithm especially in avoiding the inversion trapped in local minimum to reach global minimum. A large data are solved by windowing and blocking technique of memory as well as computation. Parameter of windowing computation is based on shot gather's aperture. This windowing technique reduces memory as well as computation significantly. This parallel algorithm is done by means cluster system of 120 processors from 20 nodes of AMD Phenom II. Benchmarking of this algorithm is done by means Marmoussi model which can be representative of complex rich fault area. It is shown that the proposed method can image clearly the rich fault and complex zone in Marmoussi model even though the initial model is quite far from the true model. Therefore, this method can be as one of solution to image the very complex mode.

Nurhandoko, Bagus Endar B.; Sukmana, Indriani; Wibowo, Satryo; Deny, Agus; Kurniadi, Rizal; Widowati, Sri; Mubarok, Syahrul; Susilowati; Kaswandhi [Wave Inversion and Subsurface Fluid Imaging Research (WISFIR) Lab., Complex System Research Division, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung. and Rock Fluid Imaging Lab., Rock Physics and Cluster C (Indonesia); Rock Fluid Imaging Lab., Rock Physics and Cluster Computing Center, Bandung (Indonesia); Physics Department of Institut Teknologi Bandung (Indonesia); Rock Fluid Imaging Lab., Rock Physics and Cluster Computing Center, Bandung, Indonesia and Institut Teknologi Telkom, Bandung (Indonesia); Rock Fluid Imaging Lab., Rock Physics and Cluster Computing Center, Bandung (Indonesia)

2012-06-20T23:59:59.000Z

16

Derivation of site-specific relationships between hydraulic parameters and p-wave velocities based on hydraulic and seismic tomography  

SciTech Connect (OSTI)

In this study, hydraulic and seismic tomographic measurements were used to derive a site-specific relationship between the geophysical parameter p-wave velocity and the hydraulic parameters, diffusivity and specific storage. Our field study includes diffusivity tomograms derived from hydraulic travel time tomography, specific storage tomograms, derived from hydraulic attenuation tomography, and p-wave velocity tomograms, derived from seismic tomography. The tomographic inversion was performed in all three cases with the SIRT (Simultaneous Iterative Reconstruction Technique) algorithm, using a ray tracing technique with curved trajectories. The experimental set-up was designed such that the p-wave velocity tomogram overlaps the hydraulic tomograms by half. The experiments were performed at a wellcharacterized sand and gravel aquifer, located in the Leine River valley near Göttingen, Germany. Access to the shallow subsurface was provided by direct-push technology. The high spatial resolution of hydraulic and seismic tomography was exploited to derive representative site-specific relationships between the hydraulic and geophysical parameters, based on the area where geophysical and hydraulic tests were performed. The transformation of the p-wave velocities into hydraulic properties was undertaken using a k-means cluster analysis. Results demonstrate that the combination of hydraulic and geophysical tomographic data is a promising approach to improve hydrogeophysical site characterization.

Brauchler, R.; Doetsch, J.; Dietrich, P.; Sauter, M.

2012-01-10T23:59:59.000Z

17

Time Dependent Density Functional Theory An introduction  

E-Print Network [OSTI]

Time Dependent Density Functional Theory An introduction Francesco Sottile LSI, Ecole Polytechnique) Time Dependent Density Functional Theory Palaiseau, 26 May 2014 1 / 62 #12;Outline 1 Introduction: why and Resources Francesco Sottile (ETSF) Time Dependent Density Functional Theory Palaiseau, 26 May 2014 2 / 62

Botti, Silvana

18

Assessment of crustal velocity models using seismic refraction and reflection tomography  

Science Journals Connector (OSTI)

......on the method of Hole Zelt (1995). A flat starting model is used and, as with the...over 80 km distance centred beneath the Rocky Mountain Trench in the Foreland Belt...American Cordillera reflection refraction Rocky Mountain Trench seismic methods South America......

Colin A. Zelt; Kalachand Sain; Julia V. Naumenko; Dale S. Sawyer

2003-06-01T23:59:59.000Z

19

Time-Dependent Nonlinear Hadley Circulation  

Science Journals Connector (OSTI)

The time-dependent Hadley circulation is studied numerically in a nonlinear, nearly inviscid, axially symmetric primitive equation model, with the heating varying periodically on an annual cycle. The annual average of the Hadley circulation ...

Ming Fang; Ka Kit Tung

1999-06-01T23:59:59.000Z

20

Crustal structure of northern Gran Canaria, Canary Islands, deduced from active seismic tomography  

Science Journals Connector (OSTI)

Seismic P-wave travel times collected during METEOR cruise M24 are inverted to derive a three-dimensional model of the P-wave velocity structure of the northern part of Gran Canaria, Canary Islands. The data consist of 6689 P-wave travel times from 1487 offshore air-gun shots which were recorded by both land-based seismometers and ocean bottom hydrophones. The crustal structure is well imaged by the data set as demonstrated by analysis of the resolution and tests with synthetic data. The volcanic island is characterized by generally high P-wave velocities (>5.5 km/s) and a heterogeneous structure with large lateral velocity variations. High P-wave velocities are found around the centers of the Miocene shield volcanoes in the vicinity of Agüimes, San Nicolas, and Agaete as well as the center of the Pliocene Roque Nublo volcano. The velocity structure suggests a high percentage of dense intrusive rocks. Some of the intrusive rocks were emplaced during the eruption of >1000 km3 of Miocene felsic magmas following the basaltic shield phase. The velocity structure beneath La Isleta peninsula and its submarine continuation is interpreted as a volcanic rift zone with abundant dikes. The velocities decrease to Gran Canaria is found at a depth of ?15 km. The structure of Gran Canaria and the adjacent ocean basin is thought to be the result of a diffuse mantle upwelling under a slowly moving plate.

Sebastian Krastel; Hans-Ulrich Schmincke

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Seismic Deployments and Experiments: PeruNet, GeoNet, and SeismoPhone.  

E-Print Network [OSTI]

Networked Sensing Seismic Deployments and Experiments:PeruNet: Installing a UCLA seismic line in Latin Americadata quality controll •Seismic tomography to reveal slab

2009-01-01T23:59:59.000Z

22

Time?dependent theory of alpha decay  

Science Journals Connector (OSTI)

Using Green’s function techniques a time?dependent theory of ? decay in the standard one?body model is developed. Formulas are obtained for the decay rate and ? energy. These formulas are combined with experimental information to show that to a good approximation the i n i t i a l ??particle wave function vanishes on or near the nuclear surface.

Michael G. Fuda

1984-01-01T23:59:59.000Z

23

Teleseismic-Seismic Monitoring At Central Nevada Seismic Zone Region  

Open Energy Info (EERE)

Central Nevada Seismic Zone Region Central Nevada Seismic Zone Region (Biasi, Et Al., 2009) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Teleseismic-Seismic Monitoring At Central Nevada Seismic Zone Region (Biasi, Et Al., 2009) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Teleseismic-Seismic Monitoring Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Glenn Biasi, Leiph Preston, Ileana Tibuleac (2009) Body Wave Tomography For Regional Scale Assessment Of Geothermal Indicators In The Western Great Basin Retrieved from "http://en.openei.org/w/index.php?title=Teleseismic-Seismic_Monitoring_At_Central_Nevada_Seismic_Zone_Region_(Biasi,_Et_Al.,_2009)&oldid=425640"

24

Probing the time dependence of dark energy  

SciTech Connect (OSTI)

A new method to investigate a possible time-dependence of the dark energy equation of state w is proposed. We apply this methodology to a combination of data involving one of the most recent type Ia supernova sample (SNLS3) along with the current baryon acoustic oscillation and H(z) measurements. We show that current observations cannot rule out a non-evolving dark energy component (dw/dz = 0). The approach developed here reduces considerably the so-called smearing effect on w determinations and may be useful to probe a possible evolving dark energy component when applied to upcoming observational data.

Barboza Edésio Jr, M. [Departamento de Física, Universidade do Estado do Rio Grande do Norte, Rua Professor Antônio Campos s/n, Mossoró (Brazil); Alcaniz, J.S., E-mail: edesiobarboza@uern.br, E-mail: alcaniz@on.br [Departamento de Astronomia, Observatório Nacional, Rua General José Cristino 77, Rio de Janeiro (Brazil)

2012-02-01T23:59:59.000Z

25

Cosmologies with a time dependent vacuum  

E-Print Network [OSTI]

The idea that the cosmological term, Lambda, should be a time dependent quantity in cosmology is a most natural one. It is difficult to conceive an expanding universe with a strictly constant vacuum energy density, namely one that has remained immutable since the origin of time. A smoothly evolving vacuum energy density that inherits its time-dependence from cosmological functions, such as the Hubble rate or the scale factor, is not only a qualitatively more plausible and intuitive idea, but is also suggested by fundamental physics, in particular by quantum field theory (QFT) in curved space-time. To implement this notion, is not strictly necessary to resort to ad hoc scalar fields, as usually done in the literature (e.g. in quintessence formulations and the like). A "running" Lambda term can be expected on very similar grounds as one expects (and observes) the running of couplings and masses with a physical energy scale in QFT. Furthermore, the experimental evidence that the equation of state of the dark energy could be evolving with time/redshift (including the possibility that it might currently behave phantom-like) suggests that a time-variable Lambda term (possibly accompanied by a variable Newton's gravitational coupling G=G(t)) could account in a natural way for all these features. Remarkably enough, a class of these models (the "new cosmon") could even be the clue for solving the old cosmological constant problem, including the coincidence problem.

Joan Sola

2011-02-09T23:59:59.000Z

26

Teleseismic transmission and reflection tomography  

E-Print Network [OSTI]

The aim of seismic tomography is to determine a model of Earth properties that best explain observed seismic data. In practice, the limitations placed on our observations and computational capabilities force us to make a ...

Burdick, Scott A. (Scott Anthony)

2014-01-01T23:59:59.000Z

27

Seismic tomography of the Excavation Damaged Zone of the Gallery 04 in the Mont Terri Rock Laboratory  

Science Journals Connector (OSTI)

......velocity is homogeneous but anisotropic with a minimum value of 2490...was created in a Mesozoic shale formation constituted by the...with the highest value of the anisotropic attenuation close to the principal...tracing modelling was done for anisotropic seismic velocity, and we......

F. Nicollin; D. Gibert; P. Bossart; Ch. Nussbaum; C. Guervilly

2008-01-01T23:59:59.000Z

28

Cross-well seismic waveform tomography for monitoring CO2 injection: a case study from the Ketzin Site, Germany  

Science Journals Connector (OSTI)

......mechanical energy that is generated...of seismic energy in a frequency band of 350-3500...amplitude response of a TC12...Monitoring CO2 response on surface...on-shore CO2 storage site at Ketzin...injection, Energy Procedia...1990. Frequency domain elastic......

Fengjiao Zhang; Christopher Juhlin; Calin Cosma; Ari Tryggvason; R. Gerhard Pratt

2012-04-01T23:59:59.000Z

29

Time dependent particle emission from fission products  

SciTech Connect (OSTI)

Decay heating following nuclear fission is an important factor in the design of nuclear facilities; impacting a variety of aspects ranging from cooling requirements to shielding design. Calculations of decay heat, often assumed to be a simple product of activity and average decay product energy, are complicated by the so called 'pandemonium effect'. Elucidated in the 1970's this complication arises from beta-decays feeding high-energy nuclear levels; redistributing the available energy between betas and gammas. Increased interest in improving the theoretical predictions of decay probabilities has been, in part, motivated by the recent experimental effort utilizing the Total Absorption Gamma-ray Spectrometer (TAGS) to determine individual beta-decay transition probabilities to individual nuclear levels. Accurate predictions of decay heating require a detailed understanding of these transition probabilities, accurate representation of particle decays as well as reliable predictions of temporal inventories from fissioning systems. We will discuss a recent LANL effort to provide a time dependent study of particle emission from fission products through a combination of Quasiparticle Random Phase Approximation (QRPA) predictions of beta-decay probabilities, statistical Hauser-Feshbach techniques to obtain particle and gamma-ray emissions in statistical Hauser-Feshbach and the nuclear inventory code, CINDER.

Holloway, Shannon T [Los Alamos National Laboratory; Kawano, Toshihiko [Los Alamos National Laboratory; Moller, Peter [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

30

Time Dependent Density Functional Theory Application to Extended Systems  

E-Print Network [OSTI]

Time Dependent Density Functional Theory Application to Extended Systems Francesco Sottile Facility (ETSF) Donostia, 25 July 2007 Time Dependent Density Functional Theory Francesco Sottile #12 Density Functional Theory Francesco Sottile #12;Linear Periodic systems ALDA The Quest for the Holy

Botti, Silvana

31

Teleseismic-Seismic Monitoring At Coso Geothermal Area (1996-2004) | Open  

Open Energy Info (EERE)

4) 4) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Teleseismic-Seismic Monitoring At Coso Geothermal Area (1996-2004) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Teleseismic-Seismic Monitoring Activity Date 1996 - 2004 Usefulness useful DOE-funding Unknown Exploration Basis To look at time dependent seismic tomography Notes Local-earthquake tomographic images were calculated for each of the years 1996 - 2004 using arrival times from the U.S. Navy's permanent seismometer network. The results show irregular strengthening with time of the wave-speed ratio V p/V s at shallow depths. The period from 1996 through 2006 was studied, and the results to date using the traditional method show, for a 2-km horizontal grid spacing, an irregular strengthening

32

Full Reviews: Seismicity and Seismic  

Broader source: Energy.gov [DOE]

Below are the project presentations and respective peer reviewer comments for Seismicity and Seismic.

33

EFFECTIVE MAXWELL EQUATIONS FROM TIME-DEPENDENT DENSITY FUNCTIONAL THEORY  

E-Print Network [OSTI]

EFFECTIVE MAXWELL EQUATIONS FROM TIME-DEPENDENT DENSITY FUNCTIONAL THEORY WEINAN E, JIANFENG LU and magnetic fields are derived starting from time-dependent density functional theory. Effective permittivity with the density functional theory [2­4] instead of the many-body Schr¨odinger or Dirac equations. This is because

Bigelow, Stephen

34

Geodynamic and seismic constraints on the thermochemical structure and dynamics of convection in the deep mantle  

Science Journals Connector (OSTI)

...Brodholt and B. J. Wood Geodynamic and seismic constraints on the thermochemical structure...by this viscosity peak. geodynamics|seismic tomography|mantle viscosity|three-dimensional...anomalies|mantle convection| Geodynamic and seismic constraints on the thermochemical structure...

2002-01-01T23:59:59.000Z

35

Time-dependent potential-functional embedding theory  

SciTech Connect (OSTI)

We introduce a time-dependent potential-functional embedding theory (TD-PFET), in which atoms are grouped into subsystems. In TD-PFET, subsystems can be propagated by different suitable time-dependent quantum mechanical methods and their interactions can be treated in a seamless, first-principles manner. TD-PFET is formulated based on the time-dependent quantum mechanics variational principle. The action of the total quantum system is written as a functional of the time-dependent embedding potential, i.e., a potential-functional formulation. By exploiting the Runge-Gross theorem, we prove the uniqueness of the time-dependent embedding potential under the constraint that all subsystems share a common embedding potential. We derive the integral equation that such an embedding potential needs to satisfy. As proof-of-principle, we demonstrate TD-PFET for a Na{sub 4} cluster, in which each Na atom is treated as one subsystem and propagated by time-dependent Kohn-Sham density functional theory (TDDFT) using the adiabatic local density approximation (ALDA). Our results agree well with a direct TDDFT calculation on the whole Na{sub 4} cluster using ALDA. We envision that TD-PFET will ultimately be useful for studying ultrafast quantum dynamics in condensed matter, where key regions are solved by highly accurate time-dependent quantum mechanics methods, and unimportant regions are solved by faster, less accurate methods.

Huang, Chen, E-mail: chenh@lanl.gov [Theoretical Division, Los Alamos National Laboratory, New Mexico 87544 (United States)] [Theoretical Division, Los Alamos National Laboratory, New Mexico 87544 (United States); Libisch, Florian [Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/136, 1040 Vienna (Austria)] [Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/136, 1040 Vienna (Austria); Peng, Qing [Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)] [Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States); Carter, Emily A., E-mail: eac@princeton.edu [Department of Mechanical and Aerospace Engineering and Chemistry, Program in Applied and Computational Mathematics, and Andlinger Center for Energy and the Environment, Princeton University, Princeton, New Jersey 08544 (United States)

2014-03-28T23:59:59.000Z

36

The time-dependent Born-Oppenheimer approximation  

E-Print Network [OSTI]

We explain why the conventional argument for deriving the time-dependent Born-Oppenheimer approximation is incomplete and review recent mathematical results, which clarify the situation and at the same time provide a systematic scheme for higher order corrections. We also present a new elementary derivation of the correct second-order time-dependent Born-Oppenheimer approximation and discuss as applications the dynamics near a conical intersection of potential surfaces and reactive scattering.

Gianluca Panati; Herbert Spohn; Stefan Teufel

2007-12-28T23:59:59.000Z

37

Two-stream instability with time-dependent drift velocity  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

The classical two-stream instability driven by a constant relative drift velocity between two plasma components is extended to the case with time-dependent drift velocity. A solution method is developed to rigorously define and calculate the instability growth rate for linear perturbations relative to the time-dependent unperturbed two-stream motions. Stability diagrams for the oscillating two-stream instability are presented over a large region of parameter space. It is shown that the growth rate for the classical two-stream instability can be significantly reduced by adding an oscillatory component to the relative drift velocity.

Qin, Hong [PPPL; Davidson, Ronald C. [PPPL

2014-01-01T23:59:59.000Z

38

Time-Dependent Kohn-Sham Theory with Memory  

Science Journals Connector (OSTI)

In time-dependent density-functional theory, exchange and correlation (xc) beyond the adiabatic approximation can be described by viscoelastic stresses in the electron liquid. In the time domain, the resulting velocity-dependent xc vector potential has a memory containing short- and long-range components, leading to decoherence and energy relaxation. We solve the associated time-dependent Kohn-Sham equations, including the dependence on densities and currents at previous times, for the case of charge-density oscillations in a quantum well. We illustrate xc memory effects, clarify the dissipation mechanism, and extract intersubband relaxation rates for weak and strong excitations.

H. O. Wijewardane and C. A. Ullrich

2005-08-15T23:59:59.000Z

39

Effective Maxwell equations from time-dependent density functional theory  

E-Print Network [OSTI]

The behavior of interacting electrons in a perfect crystal under macroscopic external electric and magnetic fields is studied. Effective Maxwell equations for the macroscopic electric and magnetic fields are derived starting from time-dependent density functional theory. Effective permittivity and permeability coefficients are obtained.

Weinan E; Jianfeng Lu; Xu Yang

2010-10-23T23:59:59.000Z

40

TECHNICAL PAPER Time dependent simulation of active flying height control  

E-Print Network [OSTI]

) sliders have been recently used to reduce flying height at the head disk interface and obtain more stableTECHNICAL PAPER Time dependent simulation of active flying height control of TFC sliders Pablo- dure is implemented to simulate the flying height response of a typical thermal flying height control

Fainman, Yeshaiahu

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Theoretical and Numerical Analysis of Polarization for Time Dependent Radiative  

E-Print Network [OSTI]

transport equation with respect to the polariza- tion parameters solve the matrix-valued radiative transferTheoretical and Numerical Analysis of Polarization for Time Dependent Radiative Transfer Equations@math.stanford.edu Abstract We consider the matrix-valued radiative transfer equations for the Stokes param- eters

Bal, Guillaume

42

Matrix Model in a Class of Time Dependent Supersymmetric Backgrounds  

E-Print Network [OSTI]

We discuss the matrix model in a class of 11D time dependent supersymmetric backgrounds as obtained in hep-th/0508191 . We construct the matrix model action through the matrix regularization of the membrane action in the background. We show that the action is exact to all order of fermionic coordinates. Furthermore We discuss the fuzzy sphere solutions in this background.

Hong-Zhi Chen; Bin Chen

2006-03-19T23:59:59.000Z

43

Time-dependent buoyant puff model for explosive sources  

SciTech Connect (OSTI)

Several models exist to predict the time dependent behavior of bouyant puffs that result from explosions. This paper presents a new model that is derived from the strong conservative form of the conservation partial differential equations that are integrated over space to yield a coupled system of time dependent nonlinear ordinary differential equations. This model permits the cloud to evolve from an intial spherical shape not an ellipsoidal shape. It ignores the Boussinesq approximation, and treats the turbulence that is generated by the puff itself and the ambient atmospheric tubulence as separate mechanisms in determining the puff history. The puff cloud rise history was found to depend no only on the mass and initial temperature of the explosion, but also upon the stability conditions of the ambient atmosphere. This model was calibrated by comparison with the Roller Coaster experiments.

Kansa, E.J.

1997-01-01T23:59:59.000Z

44

Adiabatic Decoupling and Time-Dependent Born-Oppenheimer Theory  

E-Print Network [OSTI]

We reconsider the time-dependent Born-Oppenheimer theory with the goal to carefully separate between the adiabatic decoupling of a given group of energy bands from their orthogonal subspace and the semiclassics within the energy bands. Band crossings are allowed and our results are local in the sense that they hold up to the first time when a band crossing is encountered. The adiabatic decoupling leads to an effective Schroedinger equation for the nuclei, including contributions from the Berry connection.

Herbert Spohn; Stefan Teufel

2001-11-09T23:59:59.000Z

45

Time-dependent first-principles approaches to PV materials  

SciTech Connect (OSTI)

Computational scheme for designing photovoltaic (PV) materials is presented. First-principles electron dynamics of photo-excitation and subsequent electron-hole splitting is performed based on the time-dependent density functional theory. Photo-induced enhancement of dipole moment was observed in a polar crystal and a donor-acceptor molecular pair. These experiences will pave a way to design PV material from first-principles simulations.

Miyamoto, Yoshiyuki [Nanosystem Research Institute, AIST, Central 2, 1-1-1, Umezono, Tsukuba, 305-8568 (Japan)

2013-12-10T23:59:59.000Z

46

Time-dependent density-functional theory for open systems  

E-Print Network [OSTI]

By introducing the self-energy density functionals for the dissipative interactions between the reduced system and its environment, we develop a time-dependent density-functional theory formalism based on an equation of motion for the Kohn-Sham reduced single-electron density matrix of the reduced system. Two approximate schemes are proposed for the self-energy density functionals, the complete second order approximation and the wide-band limit approximation. A numerical method based on the wide-band limit approximation is subsequently developed and implemented to simulate the steady and transient current through various realistic molecular devices. Simulation results are presented and discussed.

Xiao Zheng; Fan Wang; Chi Yung Yam; Yan Mo; GuanHua Chen

2007-02-27T23:59:59.000Z

47

Time-dependent, lattice approach to atomic collisions  

SciTech Connect (OSTI)

Recent progress in developing and applying methods of direct numerical solution of atomic collision problems is described. Various forms of the three-body problem are used to illustrate these techniques. Specifically, the process of ionization in proton-, antiproton-, and electron-impact of atomic hydrogen is considered in applications ranging in computational intensity from collisions simulated in two spatial dimensions to treatment of the three-dimensional, fully correlated two-electron Schroedinger equation. These examples demonstrate the utility and feasibility of treating strongly interacting atomic systems through time-dependent, lattice approaches.

Schultz, D.R. [Oak Ridge National Lab., TN (United States). Physics Div.

1995-12-31T23:59:59.000Z

48

Time-dependent harmonic oscillator confined in a box  

Science Journals Connector (OSTI)

In formulating the quantum-mechanical analog of the Fermi accelerator, one encounters the problem of determination of the eigenvalues of a harmonic oscillator confined to a finite region of space with time-dependent real or imaginary frequency. Here the invariants found by Lewis [J. Math. Phys. 9, 1976 (1968)] and by Lewis and Riesenfeld [J. Math. Phys. 10, 1403 (1969)] are also constants of motion; however, they are not very useful in obtaining the eigenvalues. In their place the Heisenberg equations of motion are used to describe the time evolution of this system and show how the spacing between neighboring eigenvalues changes as a function of time.

M. Razavy

1991-08-15T23:59:59.000Z

49

Electromagnetic Field Quantization in Time-Dependent Dielectric Media  

E-Print Network [OSTI]

We present a Gupta-Bleuler quantization scheme for the electromagnetic field in time-dependent dielectric media. Starting from the Maxwell equations, a generalization of the Lorentz gauge condition adapted to time varying dielectrics is derived. Using this gauge, a Gupta-Bleuler approach to quantize all polarizations of the radiation field and the corresponding constraint condition are introduced. This new approach is different from the quantized electromagnetic field in vacuum in the sense that here the contributions of unphysical photons cannot be thoroughly eliminated, which further lead to a surface charge density. Finally, a discussion of potential experimental tests and possible implication is also made.

Xiao-Min Bei; Zhong-Zhu Liu

2011-04-18T23:59:59.000Z

50

ROUTING IN TIME-DEPENDENT AND LABELED NETWORKS  

SciTech Connect (OSTI)

We study routing problems in time-dependent and edge and/or vertex-labeled transportation networks. Labels allow one to express a number of discrete properties of the edges and nodes. The main focus is a unified algorithm that efficiently solves a number of seemingly unrelated problems in transportation science. Experimental data gained from modeling practical situations suggest that the formalism allows interesting compromises between the conflicting goals of generality and efficiency. 1. We use edge/vertex labels in the framework of Formal Language Constrained Path Problems to handle discrete choice constraints. The label set is usually small and does not depend on the graph. Edge labels induct! path labels, which allows us to impose feasibility constraints on the set of paths considered as shortest path candidates. Second, we propose monotonic piecewise-linear traversal functions to represent the time-dependent aspect of link delays. The applications that can be modeled include scheduled transit and time-windows. 3. Third, we combine the above models and capture a variety of natural problems in transportatiou science such as time-window constrained trip-chaining. The results demonstrate the robustness of the proposed formalisms. As evidence for our claims of practical efficiency in a realistic setting, we report preliminary computational experience from TRANSIMS case studies of Portland, Oregon.

Barrett, C. L. (Christopher L.); Bisset, K. R. (Keith R.); Jacob, R. (Riko); Konjevod, G. (Goran); Marathe, M. V. (Madhav V.)

2001-01-01T23:59:59.000Z

51

Time-dependent current density functional theory on a lattice  

E-Print Network [OSTI]

A rigorous formulation of time-dependent current density functional theory (TDCDFT) on a lattice is presented. The density-to-potential mapping and the ${\\cal V}$-representability problems are reduced to a solution of a certain nonlinear lattice Schr\\"odinger equation, to which the standard existence and uniqueness results for nonliner differential equations are applicable. For two versions of the lattice TDCDFT we prove that any continuous in time current density is locally ${\\cal V}$-representable (both interacting and noninteracting), provided in the initial state the local kinetic energy is nonzero everywhere. In most cases of physical interest the ${\\cal V}$-representability should also hold globally in time. These results put the application of TDCDFT to any lattice model on a firm ground, and open a way for studying exact properties of exchange correlation potentials.

I. V. Tokatly

2010-11-11T23:59:59.000Z

52

Subsystem real-time Time Dependent Density Functional Theory  

E-Print Network [OSTI]

We present the extension of Frozen Density Embedding (FDE) theory to real-time Time Dependent Density Functional Theory (rt-TDDFT). FDE a is DFT-in-DFT embedding method that allows to partition a larger Kohn-Sham system into a set of smaller, coupled Kohn-Sham systems. Additional to the computational advantage, FDE provides physical insight into the properties of embedded systems and the coupling interactions between them. The extension to rt-TDDFT is done straightforwardly by evolving the Kohn-Sham subsystems in time simultaneously, while updating the embedding potential between the systems at every time step. Two main applications are presented: the explicit excitation energy transfer in real time between subsystems is demonstrated for the case of the Na$_4$ cluster and the effect of the embedding on optical spectra of coupled chromophores. In particular, the importance of including the full dynamic response in the embedding potential is demonstrated.

Krishtal, Alisa; Pavanello, Michele

2015-01-01T23:59:59.000Z

53

Seismic stations  

Science Journals Connector (OSTI)

In the previous chapters, the equipment used for seismic stations has been described. When putting this equipment out in the field, we have a seismic station. Unfortunately it is not as simple as just putting ...

Jens Havskov; Gerardo Alguacil

2004-01-01T23:59:59.000Z

54

A Time-Dependent Born–Oppenheimer Approximation with Exponentially Small Error Estimates  

Science Journals Connector (OSTI)

...We present the construction of an exponentially accurate time-dependent Born–Oppenheimer approximation for molecular quantum mechanics.

George A. Hagedorn; Alain Joye

2001-11-01T23:59:59.000Z

55

Intermolecular forces and nonbonded interactions: Superoperator nonlinear time-dependent density-functional-theory response approach  

E-Print Network [OSTI]

Intermolecular forces and nonbonded interactions: Superoperator nonlinear time-dependent density-functional-theory oscillator (CEO) eigenmodes of linearized time-dependent density-functional theory. Closed expressions response [35­38] with time- dependent density-functional theory (TDDFT) [21,39­43] to develop a systematic

Mukamel, Shaul

56

Ambient noise seismic imaging Journal: McGraw Hill 2008 Yearbook of Science & Technology  

E-Print Network [OSTI]

ForReview Ambient noise seismic imaging Journal: McGraw Hill 2008 Yearbook of Science & Technology List of Authors: Ritzwoller, Michael Keywords: ambient noise, seismology, seismic tomography, Rayleigh wave, Love wave, surface wave Abstract: A recent innovation in seismic imaging based on using long time

Ritzwolle, Mike

57

Seismic Monitoring - Hanford Site  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Curation Services Ecological Monitoring Environmental Surveillance Meteorology and Climatology Services Seismic Monitoring Seismic Monitoring Email Email Page | Print Print Page...

58

Advanced Seismic While Drilling System  

SciTech Connect (OSTI)

A breakthrough has been discovered for controlling seismic sources to generate selectable low frequencies. Conventional seismic sources, including sparkers, rotary mechanical, hydraulic, air guns, and explosives, by their very nature produce high-frequencies. This is counter to the need for long signal transmission through rock. The patent pending SeismicPULSER{trademark} methodology has been developed for controlling otherwise high-frequency seismic sources to generate selectable low-frequency peak spectra applicable to many seismic applications. Specifically, we have demonstrated the application of a low-frequency sparker source which can be incorporated into a drill bit for Drill Bit Seismic While Drilling (SWD). To create the methodology of a controllable low-frequency sparker seismic source, it was necessary to learn how to maximize sparker efficiencies to couple to, and transmit through, rock with the study of sparker designs and mechanisms for (a) coupling the sparker-generated gas bubble expansion and contraction to the rock, (b) the effects of fluid properties and dynamics, (c) linear and non-linear acoustics, and (d) imparted force directionality. After extensive seismic modeling, the design of high-efficiency sparkers, laboratory high frequency sparker testing, and field tests were performed at the University of Texas Devine seismic test site. The conclusion of the field test was that extremely high power levels would be required to have the range required for deep, 15,000+ ft, high-temperature, high-pressure (HTHP) wells. Thereafter, more modeling and laboratory testing led to the discovery of a method to control a sparker that could generate low frequencies required for deep wells. The low frequency sparker was successfully tested at the Department of Energy Rocky Mountain Oilfield Test Center (DOE RMOTC) field test site in Casper, Wyoming. An 8-in diameter by 26-ft long SeismicPULSER{trademark} drill string tool was designed and manufactured by TII. An APS Turbine Alternator powered the SeismicPULSER{trademark} to produce two Hz frequency peak signals repeated every 20 seconds. Since the ION Geophysical, Inc. (ION) seismic survey surface recording system was designed to detect a minimum downhole signal of three Hz, successful performance was confirmed with a 5.3 Hz recording with the pumps running. The two Hz signal generated by the sparker was modulated with the 3.3 Hz signal produced by the mud pumps to create an intense 5.3 Hz peak frequency signal. The low frequency sparker source is ultimately capable of generating selectable peak frequencies of 1 to 40 Hz with high-frequency spectra content to 10 kHz. The lower frequencies and, perhaps, low-frequency sweeps, are needed to achieve sufficient range and resolution for realtime imaging in deep (15,000 ft+), high-temperature (150 C) wells for (a) geosteering, (b) accurate seismic hole depth, (c) accurate pore pressure determinations ahead of the bit, (d) near wellbore diagnostics with a downhole receiver and wired drill pipe, and (e) reservoir model verification. Furthermore, the pressure of the sparker bubble will disintegrate rock resulting in an increased overall rates of penetration. Other applications for the SeismicPULSER{trademark} technology are to deploy a low-frequency source for greater range on a wireline for Reverse Vertical Seismic Profiling (RVSP) and Cross-Well Tomography. Commercialization of the technology is being undertaken by first contacting stakeholders to define the value proposition for rig site services utilizing SeismicPULSER{trademark} technologies. Stakeholders include national oil companies, independent oil companies, independents, service companies, and commercial investors. Service companies will introduce a new Drill Bit SWD service for deep HTHP wells. Collaboration will be encouraged between stakeholders in the form of joint industry projects to develop prototype tools and initial field trials. No barriers have been identified for developing, utilizing, and exploiting the low-frequency SeismicPULSER{trademark} source in a

Robert Radtke; John Fontenot; David Glowka; Robert Stokes; Jeffery Sutherland; Ron Evans; Jim Musser

2008-06-30T23:59:59.000Z

59

Time dependence of particle creation from accelerating mirrors Michael R. R. Good*  

E-Print Network [OSTI]

time resolution of the particle production process can be obtained. DOI: 10.1103/PhysRevD.88 that has been largely unexplored is the study of the time dependence of the particle production process dependence of creation. One way to explore the time dependence of particle production is through the use

Anderson, Paul R.

60

On the Floquet formulation of time-dependent density functional theory  

E-Print Network [OSTI]

On the Floquet formulation of time-dependent density functional theory Neepa T. Maitra *, Kieron by Elsevier Science B.V. Ground-state density functional theory (DFT) [1] has been tremendously successful generalized ground-state density functional theory to time-dependent problems (TDDFT) [4]. TDDFT has become

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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.


61

Spin-Multiplet Energies from Time-Dependent Density-Functional Theory  

E-Print Network [OSTI]

Spin-Multiplet Energies from Time-Dependent Density-Functional Theory M. Petersilka and E, density-functional theory (DFT) [1, 2, 3, 4, 5] has enjoyed increas- ing popularity in the #12;eld energies which is based on time-dependent density- functional theory (TDDFT) [26]. In the linear response

Gross, E.K.U.

62

Phase-space explorations in time-dependent density functional theory A.K. Rajam a  

E-Print Network [OSTI]

Phase-space explorations in time-dependent density functional theory A.K. Rajam a , Paul Hessler b online xxxx Keywords: Time-dependent density functional theory Phase-space Momentum-distributions Density to phase-space densities, discuss some formal aspects of such a ``phase-space density functional theory

63

Efficient computation of the coupling matrix in Time-Dependent Density Functional Theory  

E-Print Network [OSTI]

Efficient computation of the coupling matrix in Time-Dependent Density Functional Theory Emmanuel arising in time-dependent density functional theory. The two important aspects involved, solution- dopotentials within density functional theory (DFT) [1]. This approach has been used to predict mechanical

Lorin, Emmanuel

64

Time-dependent Density Functional Theory Miguel A. L. Marques and E. K. U. Gross  

E-Print Network [OSTI]

Time-dependent Density Functional Theory Miguel A. L. Marques and E. K. U. Gross 1 Introduction Time-dependent density-functional theory (TDDFT) extends the basic ideas of ground-state density-functional is the one-body electron density, n(r, t). The advantages are clear: The many-body wave-function, a function

Wu, Zhigang

65

Shannon Entropy Based Time-Dependent Deterministic Sampling for Efficient "On-the-Fly" Quantum Dynamics  

E-Print Network [OSTI]

methodologies employed in gas- phase1 and condensed-phase chemical dynamics.2 When uti- lized, the BornShannon Entropy Based Time-Dependent Deterministic Sampling for Efficient "On-the-Fly" Quantum, United States Received October 14, 2010 Abstract: A new set of time-dependent deterministic sampling

Iyengar, Srinivasan S.

66

Adiabatic Decoupling and Time-Dependent Born-Oppenheimer Herbert Spohn and Stefan Teufel  

E-Print Network [OSTI]

Adiabatic Decoupling and Time-Dependent Born-Oppenheimer Theory Herbert Spohn and Stefan Teufel: spohn@ma.tum.de, teufel@ma.tum.de July 9, 2001 Abstract We reconsider the time-dependent Born-Oppenheimer , and heavy nuclei, mass M which depends on the type of nucleus. Born and Oppenheimer [3] wanted to explain

67

A Time--Dependent Born--Oppenheimer Approximation with Exponentially Small Error Estimates  

E-Print Network [OSTI]

A Time--Dependent Born--Oppenheimer Approximation with Exponentially Small Error Estimates George A accurate time--dependent Born-- Oppenheimer approximation for molecular quantum mechanics. We study is the usual Born--Oppenheimer expansion parameter ffl, where ffl 4 is the ratio of the electron mass divided

68

Author's personal copy The time dependent vehicle routing problem with time windows  

E-Print Network [OSTI]

: (a) formulate a time dependent vehicle routing problem with a general cost function and time windowAuthor's personal copy The time dependent vehicle routing problem with time windows: Benchmark College of Engineering and Computer Science, PO Box 0751, Portland State University, Portland, OR 97207

Bertini, Robert L.

69

A ROUTE IMPROVEMENT ALGORITHM FOR THE VEHICLE ROUTING PROBLEM WITH TIME DEPENDENT TRAVEL TIMES  

E-Print Network [OSTI]

) formulate a time dependent vehicle routing problem with a general cost function and time window constraintsA ROUTE IMPROVEMENT ALGORITHM FOR THE VEHICLE ROUTING PROBLEM WITH TIME DEPENDENT TRAVEL TIMES MIGUEL A. FIGLIOZZI Civil & Environmental Engineering Department Portland State University P.O. Box 751

Bertini, Robert L.

70

Electron transfer through time dependent bridges: Differences between Franck–Condon and Born–Oppenheimer breakdown  

Science Journals Connector (OSTI)

We consider tunneling-mediated electron transfer through time dependent bridges. An approach is developed for computing corrections to the time dependent tunneling matrix element that arise from the breakdown of the Born–Oppenheimer Adiabatic approximation. Differences between Franck–Condon and Born–Oppenheimer breakdown are discussed in the context of bridge-mediated tunneling.

Antonios Teklos; Spiros S. Skourtis

2005-01-01T23:59:59.000Z

71

Single machine scheduling problems under the effects of nonlinear deterioration and time-dependent learning  

Science Journals Connector (OSTI)

Job deterioration and machine learning co-exist in various real life scheduling settings. This paper studies several single machine scheduling problems under the joint effect of nonlinear job deterioration and time-dependent learning. We assume that ... Keywords: Deteriorating jobs, Scheduling, Time-dependent learning effect

M. Duran Toksar?; Daniel Oron; Ertan GüNer

2009-08-01T23:59:59.000Z

72

Time-dependent laser ignition of a combustible stagnant boundary layer  

Science Journals Connector (OSTI)

......research-article Articles Time-dependent laser ignition of a combustible stagnant boundary...55,257-268 Time-dependent laser ignition of a combustible stagnant boundary...examines the conditions for laser ignition of a number of industrial gases......

J. ADLER

1995-12-01T23:59:59.000Z

73

Time-Dependent Nonlinear Hadley Circulation Ming Fang and Ka Kit Tung  

E-Print Network [OSTI]

Time-Dependent Nonlinear Hadley Circulation Ming Fang and Ka Kit Tung Department of Applied Mathematics University of Washington Seattle, WA February 19, 1998 0 #12;Abstract The time-dependent Hadley, with the heating varying periodically on an annual cycle. The annual average of the Hadley circulation strength

Tung, Ka-Kit

74

Seismic reliability analysis of reinforced concrete framed buildings deteriorated by chloride ingress  

Science Journals Connector (OSTI)

The main purpose of this study is to propose an evaluation method that can be used for analysing the time-dependent seismic reliability of reinforced concrete (RC) buildings located in a corrosive environment with high seismic hazard. In this study, several models have been developed to investigate the deterioration induced by chloride ingress in order to estimate the initiation stage and rate of corrosion and to analyse the structural capacity of columns and beams with corroded reinforcing bars; then, the seismic evaluation for RC framed buildings was used for calculating the story shear capacity of each floor in a building. In addition, the hazard curve of the story shear demand for each floor obtained from the seismic hazard analysis was adopted; consequently, a Monte Carlo simulation was carried out for estimating the annual failure probability and seismic reliability index of the concerned building; in other words, a time-dependent seismic reliability function could be built.

Chien-Kuo Chiu; Wen-Yu Jean

2013-01-01T23:59:59.000Z

75

Brief review related to the foundations of time-dependent density functional theory  

E-Print Network [OSTI]

The electron density $n(\\rb,t)$, which is the central tool of time-dependent density functional theory, is presently considered to be derivable from a one-body time-dependent potential $V(\\rb,t)$, via one-electron wave functions satisfying a time- dependent Schr\\"{o}dinger equation. This is here related via a generalized equation of motion to a Dirac density matrix now involving $t$. Linear response theory is then surveyed, with a special emphasis on the question of causality with respect to the density dependence of the potential. Extraction of $V(\\rb,t)$ for solvable models is also proposed.

Thomas A. Niehaus; Norman H. March

2009-04-28T23:59:59.000Z

76

Seismic tomography with the reversible jump algorithm  

Science Journals Connector (OSTI)

......form. In practice, we are at liberty to generate the nuclei using...2-D region. That is, we project the partition models into the...because at each iteration, it projects the full linearized inverse...Government Programme. This project was also supported by a French-Australian......

Thomas Bodin; Malcolm Sambridge

2009-09-01T23:59:59.000Z

77

Seismicity Maps  

Science Journals Connector (OSTI)

...density, highly porous airborne vol- canic ejecta near...explosions for such stress-release experiments cannot be...a)+e2 /7 f is the fraction of stress drop and a...Steinbrugge Pacific Fire Rating Bureau San Francisco...fault belt without the release of seismic energy. Hence...

78

One-Dimensional Time-Dependent Modeling of GATE Cumulonimbus Convection  

Science Journals Connector (OSTI)

A one-dimensional time-dependent cumulonimbus model is designed that, unlike in previous one-dimensional models, simulates cloud-top heights, vertical velocities, and water contents that are reasonably consistent with those observed in real ...

Brad Schoenberg Ferrier; Robert A. Houze Jr.

1989-02-01T23:59:59.000Z

79

Case study: visual analysis of complex, time-dependent simulation results of a diesel exhaust system  

Science Journals Connector (OSTI)

In previous work we have presented visualization techniques that provide engineers with a high degree of interactivity and flexibility for analyzing large, time-dependent, and high-dimensional data sets resulting from CFD (computational fluid dynamics) ...

Helmut Doleisch; Michael Mayer; Martin Gasser; Roland Wanker; Helwig Hauser

2004-05-01T23:59:59.000Z

80

A FINITE ELEMENT MODEL FOR THE TIME-DEPENDENT JOULE HEATING PROBLEM*  

E-Print Network [OSTI]

.3) 0 system models the electric heating* *ial differential equation describing the electric heating of a conducting body. We prove err* *or A FINITE ELEMENT MODEL FOR THE TIME-DEPENDENT JOULE HEATING PROBLEM

Larsson, Stig

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Time-Dependent Reliability Analysis of Nuclear Reactor Operators Using Probabilistic Network Models  

Science Journals Connector (OSTI)

Human factors are very important for the reliability of a nuclear power plant. Human behavior has essentially time-dependent nature. The details of thinking and decision making processes are important for deta...

Yoshiaki Oka; Kenji Miyata; Hideki Kodaira…

1988-01-01T23:59:59.000Z

82

Born?Oppenheimer Time-Dependent Systems:? Perturbative vs Nonperturbative Diabatization  

Science Journals Connector (OSTI)

In this article a time-dependent molecular system is considered. The theoretical treatment is characterized by the fact that here, for the first time, the adiabatic framework is assumed to contain singular nonadiabatic coupling terms or, in other words, ...

Michael Baer

2003-05-17T23:59:59.000Z

83

Time dependent ellipsoidal residual velocity distributions for self-gravitating systems of collisionless particles  

E-Print Network [OSTI]

TIME DEPENDENT ELLIPSOIDAL RESIDUAL VELOCITY DISTRIBUTIONS FOR SELF-GRAVITATING SYSTEMS OF COLLISIONLESS PARTICLES A Thesis by FRANK ROBERT SINS Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE May 1973 Major Subject: Physi cs TIME DEPENDENT ELLIPSOIDAL RESIDUAL VELOCITY DISTRIBUTIONS FOR SELF-GRAVITATING SYSTEMS OF COLLISIONLESS PARTICLES A Thesis by FRANK ROBERT SIMMS Approved as to style...

Simms, Frank Robert

1973-01-01T23:59:59.000Z

84

Seismic Array Software System  

E-Print Network [OSTI]

Seismic Array Software System Sam Irvine, Martin Lukac,of a Portable Broadband Seismic Array Long - • Part of theStudy the propagation of seismic waves in Mexico City • Line

2005-01-01T23:59:59.000Z

85

Submarine Seismic Investigations  

Science Journals Connector (OSTI)

...March 1941 research-article Submarine Seismic Investigations E. C. Bullard T. F. Gaskell The refraction seismic method has been used to investigate the...techniques, and results of a refraction seismic survey of the rock surface underlying...

1941-01-01T23:59:59.000Z

86

Phase space theory of Bose-Einstein condensates and time-dependent modes  

E-Print Network [OSTI]

A phase space theory approach for treating dynamical behaviour of Bose-Einstein condensates applicable to situations such as interferometry with BEC in time-dependent double well potentials is presented. Time-dependent mode functions are used, chosen so that one, two,.. highly occupied modes describe well the physics of interacting condensate bosons in time dependent potentials at well below the transition temperature. Time dependent mode annihilation, creation operators are represented by time dependent phase variables, but time independent total field annihilation, creation operators are represented by time independent field functions. Two situations are treated, one (mode theory) is where specific mode annihilation, creation operators and their related phase variables and distribution functions are dealt with, the other (field theory) is where only field creation, annihilation operators and their related field functions and distribution functionals are involved. The paper focuses on the hybrid approach, where the modes are divided up between condensate (highly occupied) modes and non-condensate (sparsely occupied) modes. It is found that there are extra terms in the Ito stochastic equations both for the stochastic phases and stochastic fields, involving coupling coefficients defined via overlap integrals between mode functions and their time derivatives. For the hybrid approach both the Fokker-Planck and functional Fokker-Planck equations differ from those derived via the correspondence rules, the drift vectors are unchanged but the diffusion matrices contain additional terms involving the coupling coefficients. Results are also presented for the combined approach where all the modes are treated as one set.

B. J. Dalton

2012-07-20T23:59:59.000Z

87

Time-dependent Born–Oppenheimer approximation approach for Schrödinger equation: Application to H2+  

Science Journals Connector (OSTI)

Abstract We deploy a time-dependent Born–Oppenheimer approximation approach for numerically solving the time-dependent Schrödinger equation (TDSE) by reducing the wavefunction dimensionality to nuclear and electronic degrees of freedom, and apply it to a one-dimensional model of H2+. Based upon our three distinct error evaluation schemes, we quantitatively compare the wavefunctions and HHG spectra which are computed by the present approximation method, with those obtained by fully solving the TDSE. The similarities of both the wavefunctions and the HHG spectra justify that our approach is feasibly precise for medium laser intensity. It is also anticipated that this approximation can be adopted for other polyatomic molecules with a dimensionality reduction and computational simplification in calculating the time-dependent wavefunctions.

Chuan Yu; Ning Fu; Chunyan Dai; Hua Wang; Guizhong Zhang; Jianquan Yao

2013-01-01T23:59:59.000Z

88

A Time-Dependent Born-Oppenheimer Approximation with Exponentially Small Error Estimates  

E-Print Network [OSTI]

We present the construction of an exponentially accurate time-dependent Born-Oppenheimer approximation for molecular quantum mechanics. We study molecular systems whose electron masses are held fixed and whose nuclear masses are proportional to $\\epsilon^{-4}$, where $\\epsilon$ is a small expansion parameter. By optimal truncation of an asymptotic expansion, we construct approximate solutions to the time-dependent Schr\\"odinger equation that agree with exact normalized solutions up to errors whose norms are bounded by $\\ds C \\exp(-\\gamma/\\epsilon^2)$, for some C and $\\gamma>0$.

George A. Hagedorn; Alain Joye

2000-05-03T23:59:59.000Z

89

Are plasma depletions in Saturn's ionosphere a signature of time-dependent water input?  

E-Print Network [OSTI]

Are plasma depletions in Saturn's ionosphere a signature of time- dependent water input? Luke Moore the presence of numerous ``ionospheric holes'', or plasma depletions, in Saturn's upper atmosphere that cannot the observed plasma depletions. The required influxes present a target to assess for the possible sources

Mendillo, Michael

90

Spatial and time-dependent distribution of plasma parameters in the metal-halide arc lamp.  

E-Print Network [OSTI]

Spatial and time-dependent distribution of plasma parameters in the metal-halide arc lamp. A. Khakhaev, L. Luizova, K. Ekimov and A. Soloviev Petrozavodsk State University, Russia The metal-halide arc lamp is an effective light source and its investigation has a long history, but even at present some

Paris-Sud XI, Université de

91

QUANTUM ENERGY EXPECTATION IN PERIODIC TIME-DEPENDENT HAMILTONIANS VIA GREEN  

E-Print Network [OSTI]

QUANTUM ENERGY EXPECTATION IN PERIODIC TIME-DEPENDENT HAMILTONIANS VIA GREEN FUNCTIONS C´ESAR R. DE. Introduction 1 2. Average Energy and Green Functions 4 3. Applications 10 3.1. Time-Independent Hamiltonians 10(t). For each positive and discrete observable A (which we call a probe energy), we derive a formula

92

ORBITAL FUNCTIONALS IN STATIC AND TIME-DEPENDENT DENSITY FUNCTIONAL THEORY  

E-Print Network [OSTI]

ORBITAL FUNCTIONALS IN STATIC AND TIME-DEPENDENT DENSITY FUNCTIONAL THEORY E.K.U. Gross, T-97074 Wurzburg Germany INTRODUCTION Density functional theory (DFT) is among the most powerful quantum statements: 1 #12; 1. The ground-state density n uniquely determines the ground-state wave function [n

Gross, E.K.U.

93

Parameter-free calculation of response functions in time dependent density functional theory  

E-Print Network [OSTI]

Parameter-free calculation of response functions in time dependent density functional theory - Quasiparticle approach - Density functional approach Mapping theory to describe spectra of solids in TDDFT Towards an efficient (fast) theory Conclusions #12;Dielectric function of the material Vtot = -1 Vext Non

Botti, Silvana

94

Lattice Boltzmann simulations of a time-dependent natural convection problem  

E-Print Network [OSTI]

Lattice Boltzmann simulations of a time-dependent natural convection problem Beno^it Trouette September 2, 2013 Abstract A two-dimensional double Multiple-Relaxation-Time thermal lattice Boltzmann-dependent flows as well as the space and time convergence orders. Keywords: Thermal lattice Boltzmann method

Boyer, Edmond

95

A Time{Dependent Born{Oppenheimer Approximation with Exponentially Small Error Estimates  

E-Print Network [OSTI]

A Time{Dependent Born{Oppenheimer Approximation with Exponentially Small Error Estimates George A{ Oppenheimer approximation for molecular quantum mechanics. We study molecular systems whose electron masses. The small parameter that governs the approximation is the usual Born{Oppenheimer expansion parameter #15

Joye, Alain

96

A Time--Dependent Born--Oppenheimer Approximation with Exponentially Small Error Estimates  

E-Print Network [OSTI]

A Time--Dependent Born--Oppenheimer Approximation with Exponentially Small Error Estimates George A--dependent Born-- Oppenheimer approximation for molecular quantum mechanics. We study molecular systems whose parameter that governs the approximation is the usual Born--Oppenheimer expansion parameter #, where # 4

Hagedorn, George A.

97

The AC Stark E#ect, Time--Dependent Born--Oppenheimer Approximation, and  

E-Print Network [OSTI]

The AC Stark E#ect, Time--Dependent Born--Oppenheimer Approximation, and Franck--Condon Factors by a classical oscillatory electric field, and we employ the Born--Oppenheimer approximation for the molecule. We-- Condon factors that we compute explicitly to leading order in the Born--Oppenheimer parameter. We also

Rousse, Vidian

98

The AC Stark E ect, Time{Dependent Born{Oppenheimer Approximation, and  

E-Print Network [OSTI]

The AC Stark E#11;ect, Time{Dependent Born{Oppenheimer Approximation, and Franck{Condon Factors the laser pulse by a classical oscillatory electric #12;eld, and we employ the Born{Oppenheimer. These amplitudes contain Franck{ Condon factors that we compute explicitly to leading order in the Born{Oppenheimer

Hagedorn, George A.

99

Climate Projections Using Bayesian Model Averaging and Space-Time Dependence  

E-Print Network [OSTI]

Climate Projections Using Bayesian Model Averaging and Space-Time Dependence K. Sham Bhat, Murali Haran, Adam Terando, and Klaus Keller. Abstract Projections of future climatic changes are a key input to the design of climate change mitiga- tion and adaptation strategies. Current climate change projections

Haran, Murali

100

VISUAL QUERY OF TIME-DEPENDENT 3D WEATHER IN A GLOBAL GEOSPATIAL  

E-Print Network [OSTI]

, and investigation as much as other data (e.g., satellite imagery). Indeed, even the National Weather Service is only1 VISUAL QUERY OF TIME-DEPENDENT 3D WEATHER IN A GLOBAL GEOSPATIAL ENVIRONMENT William Ribarsky WEATHER IN A GLOBAL GEOSPATIAL ENVIRONMENT William Ribarsky, Nickolas Faust, Zachary Wartell, Christopher

Shaw, Chris

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Instability of time-dependent wind-driven ocean gyres Paul C. F. van der Vaart  

E-Print Network [OSTI]

Instability of time-dependent wind-driven ocean gyres Paul C. F. van der Vaart Institute for Marine, Delft, the Netherlands Daniel Calvete Department Fisica Aplicada, UPC, Barcelona, Spain Henk A September 2002 The wind-driven ocean circulation at midlatitudes is susceptible to several types

Schuttelaars, Henk

102

Seismic sources  

DOE Patents [OSTI]

Apparatus is described for placement in a borehole in the earth, which enables the generation of closely controlled seismic waves from the borehole. Pure torsional shear waves are generated by an apparatus which includes a stator element fixed to the borehole walls and a rotor element which is electrically driven to rapidly oscillate on the stator element to cause reaction forces transmitted through the borehole walls to the surrounding earth. Longitudinal shear waves are generated by an armature that is driven to rapidly oscillate along the axis of the borehole, to cause reaction forces transmitted to the surrounding earth. Pressure waves are generated by electrically driving pistons that press against opposite ends of a hydraulic reservoir that fills the borehole. High power is generated by energizing the elements for more than about one minute. 9 figs.

Green, M.A.; Cook, N.G.W.; McEvilly, T.V.; Majer, E.L.; Witherspoon, P.A.

1987-04-20T23:59:59.000Z

103

Neutron Tomography and Space  

E-Print Network [OSTI]

Kevin Shields, “Optimization of neutron tomography for rapidNEUTRON TOMOGRAPHY AND SPACE Hal Egbert, Ronald Walker, R.industrial applications[1]. Neutron Computed Tomography was

Egbert, Hal; Walker, Ronald; Flocchini, R.

2007-01-01T23:59:59.000Z

104

Atom Probe Tomography | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Atom Probe Tomography Atom Probe Tomography The LEAP 4000 XHR local electrode atom probe tomography instrument enabled the first-ever comprehensive and accurate 3-D chemical...

105

P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas  

E-Print Network [OSTI]

This thesis involves inverting the seismic structure of the crust and uppermost mantle in China from the P- and S-wave travel-time tomography. The main contributions of this research are: 1) introducing the adaptive moving ...

Sun, Youshun, 1970-

2005-01-01T23:59:59.000Z

106

Born-Oppenheimer approximation and beyond for time-dependent electronic processes  

SciTech Connect (OSTI)

Explicit computations of electronic motion in time and space are gradually becoming feasible and available. The knowledge of this motion is of relevance by itself but is also important for understanding available and predicting future experiments on the electronic time scale. In electronic processes of interest, usually several and even many stationary electronic states participate and the obvious question arises on how to describe the accompanying quantum nuclear dynamics at least on the time scale of the process. In this work, we attempt to study the nuclear dynamics in the framework of a fully time-dependent Born-Oppenheimer approximation. Additionally, we attempt to go beyond this approximation by introducing the coupling of several electronic wavepackets by the nuclear wavepackets. In this context, we also discuss a time-dependent transformation to diabatic electronic wavepackets. A simple but critical model of charge transfer is analyzed in some detail on various levels of approximation and also solved exactly.

Cederbaum, L. S. [Theoretische Chemie, Physikalisch-Chemisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

2008-03-28T23:59:59.000Z

107

Time dependence of the paramagnetic Meissner effect: Comparison between model calculations and experiments  

Science Journals Connector (OSTI)

Experimental results of the temperature, field, and time dependence of the magnetization in high-temperature superconductors displaying the paramagnetic Meissner effect are compared with numerical results from model calculations. In experiments the relaxation rate of the zero-field-cooled magnetization exhibits novel field-dependent properties and the field-cooled magnetization is found to increase with time. A model based on an ensemble of superconducting loops, each loop containing an ordinary Josephson junction or a ? junction, is shown to be able to account for most of the experimental results. The time-dependent magnetization is explained by thermally activated flipping of spontaneous orbital magnetic moments, a dynamical process which is fundamentally different from the flux-creep phenomenon usually observed in type-II superconductors.

J. Magnusson; J.-O. Andersson; M. Björnander; P. Nordblad; P. Svedlindh

1995-05-01T23:59:59.000Z

108

Quantum Simulation of Time-Dependent Hamiltonians and the Convenient Illusion of Hilbert Space  

Science Journals Connector (OSTI)

We consider the manifold of all quantum many-body states that can be generated by arbitrary time-dependent local Hamiltonians in a time that scales polynomially in the system size, and show that it occupies an exponentially small volume in Hilbert space. This implies that the overwhelming majority of states in Hilbert space are not physical as they can only be produced after an exponentially long time. We establish this fact by making use of a time-dependent generalization of the Suzuki-Trotter expansion, followed by a well-known counting argument. This also demonstrates that a computational model based on arbitrarily rapidly changing Hamiltonians is no more powerful than the standard quantum circuit model.

David Poulin; Angie Qarry; Rolando Somma; Frank Verstraete

2011-04-29T23:59:59.000Z

109

The current density in quantum electrodynamics in time-dependent external potentials and the Schwinger effect  

E-Print Network [OSTI]

In the framework of quantum electrodynamics (QED) in external potentials, we introduce a method to compute the time-dependence of the expectation value of the current density for time-dependent homogeneous external electric fields. We apply it to the so-called Sauter pulse. For late times, our results agree with the asymptotic value due to electron-positron pair production. For sub-critical peak field strengths, or results agree very well with the general expression derived by Serber for the linearization in the external field. In particular, the expectation value of the current density at intermediate times can be much greater than at asymptotic times. We comment on consequences of these findings for recent proposals to test the Schwinger effect with high intensity lasers using processes at intermediate times.

Zahn, Jochen

2015-01-01T23:59:59.000Z

110

Transient energy excitation in shortcuts to adiabaticity for the time-dependent harmonic oscillator  

SciTech Connect (OSTI)

We study for the time-dependent harmonic oscillator the transient energy excitation in speed-up processes ('shortcuts to adiabaticity') designed to reproduce the initial populations at some predetermined final frequency and time. We provide lower bounds and examples. Implications for the limits imposed to the process times and for the principle of unattainability of the absolute zero, in a single expansion or in quantum refrigerator cycles, are drawn.

Chen Xi [Departamento de Quimica Fisica, UPV-EHU, Apartado 644, E-48080 Bilbao (Spain); Department of Physics, Shanghai University, 200444 Shanghai (China); Muga, J. G. [Departamento de Quimica Fisica, UPV-EHU, Apartado 644, E-48080 Bilbao (Spain); Max Planck Institute for the Physics of Complex Systems, Noethnitzer Strasse 38, D-01187 Dresden (Germany)

2010-11-15T23:59:59.000Z

111

Time-Dependent Implementation of Argonne’s Model for Universal Solvent Extraction  

Science Journals Connector (OSTI)

Time-Dependent Implementation of Argonne’s Model for Universal Solvent Extraction ... Chemical Sciences and Engineering, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States ... Argonne’s Model for Universal Solvent Extraction (AMUSE) simulates multistage counter-current solvent extraction processes for species of interest to spent nuclear fuel reprocessing; it is a model of a liquid–liquid extraction unit operation. ...

Kurt Frey; John F. Krebs; Candido Pereira

2012-09-04T23:59:59.000Z

112

On the existence of effective potentials in time-dependent density functional theory  

E-Print Network [OSTI]

We investigate the existence and properties of effective potentials in time-dependent density functional theory. We outline conditions for a general solution of the corresponding Sturm-Liouville boundary value problems. We define the set of potentials and v-representable densities, give a proof of existence of the effective potentials under certain restrictions, and show the set of v-representable densities to be independent of the interaction.

M. Ruggenthaler; M. Penz; D. Bauer

2009-11-10T23:59:59.000Z

113

Experiments with a time-dependent, zonally averaged, seasonal, enery balance climatic model  

E-Print Network [OSTI]

EXPERIMENTS WITH A TI&E-DEPENDENT, ZONALLY AVERAGED, SEASONAL, ENERGY BALANCE CLIMATIC MODEL A Thesis by STARLEY LEE THOMPSON Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirement for the decree... of MASTER OF SCIENCE December 1977 Major Subject: Meteorology EXPERIMENTS WITH A TIME DEPENDENT~ ZONALLY AVERAGED~ SEASONAL, ENERGY BALANCE CLIMATIC MODEL A Thesis by STARLEY LEE THOMPSON Approved as to style and content by: (Chairman of Committee...

Thompson, Starley Lee

2012-06-07T23:59:59.000Z

114

The Time-dependent Supersymmetric Configurations in M-theory and Matrix Models  

E-Print Network [OSTI]

In this paper, we study the half-supersymmetric time-dependent configurations in M-theory and their matrix models. We find a large class of 11D supergravity solutions, which keeps sixteen supersymmetries. Furthermore, we investigate the isometries of these configurations and show that in general these configurations have no supernumerary supersymmetries. And also we define the Matrix models in these backgrounds following Discrete Light-Cone Quantization (DLCQ) prescription.

Bin Chen

2005-08-25T23:59:59.000Z

115

Linear-response calculation in the time-dependent density functional theory  

SciTech Connect (OSTI)

Linear response calculations based on the time-dependent density-functional theory are presented. Especially, we report results of the finite amplitude method which we have recently proposed as an alternative and feasible approach to the (quasiparticle-)random-phase approximation. Calculated properties of the giant resonances and low-energy E1 modes are discussed. We found a universal linear correlation between the low-energy E1 strength and the neutron skin thickness.

Nakatsukasa, Takashi; Inakura, Tsunenori; Avogadro, Paolo; Ebata, Shuichiro; Sato, Koichi; Yabana, Kazuhiro [RIKEN Nishina Center, Wako-shi 351-0198, Japan and Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8571 (Japan); RIKEN Nishina Center, Wako-shi 351-0198 (Japan); Departimento di Fisica, Universita degli Studi di Milano, via Celoria 16, 20133 Milan (Italy) and RIKEN Nishina Center, Wako-shi 351-0198 (Japan); Center for Nuclear Study, University of Tokyo, Bunkyo-ku, 113-0033, Japan and RIKEN Nishina Center, Wako-shi 351-0198 (Japan); RIKEN Nishina Center, Wako-shi 351-0198 (Japan); Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8571 (Japan) and RIKEN Nishina Center, Wako-shi 351-0198 (Japan)

2012-11-12T23:59:59.000Z

116

The development of the time dependence of the nuclear EMP electric field  

SciTech Connect (OSTI)

The nuclear electromagnetic pulse (EMP) electric field calculated with the legacy code CHAP is compared with the field given by an integral solution of Maxwell's equations, also known as the Jefimenko equation, to aid our current understanding on the factors that affect the time dependence of the EMP. For a fair comparison the CHAP current density is used as a source in the Jefimenko equation. At first, the comparison is simplified by neglecting the conduction current and replacing the standard atmosphere with a constant density air slab. The simplicity of the resultant current density aids in determining the factors that affect the rise, peak and tail of the EMP electric field versus time. The three dimensional nature of the radiating source, i.e. sources off the line-of-sight, and the time dependence of the derivative of the current density with respect to time are found to play significant roles in shaping the EMP electric field time dependence. These results are found to hold even when the conduction current and the standard atmosphere are properly accounted for. Comparison of the CHAP electric field with the Jefimenko electric field offers a direct validation of the high-frequency/outgoing wave approximation.

Eng, C

2009-10-30T23:59:59.000Z

117

Seismic sources  

DOE Patents [OSTI]

Apparatus is described for placement in a borehole in the earth, which enables the generation of closely controlled seismic waves from the borehole. Pure torsional shear waves are generated by an apparatus which includes a stator element fixed to the borehole walls and a rotor element which is electrically driven to rapidly oscillate on the stator element to cause reaction forces transmitted through the borehole walls to the surrounding earth. Logitudinal shear waves are generated by an armature that is driven to rapidly oscillate along the axis of the borehole relative to a stator that is clamped to the borehole, to cause reaction forces transmitted to the surrounding earth. Pressure waves are generated by electrically driving pistons that press against opposite ends of a hydraulic reservoir that fills the borehole. High power is generated by energizing the elements at a power level that causes heating to over 150.degree. C. within one minute of operation, but energizing the elements for no more than about one minute.

Green, Michael A. (Oakland, CA); Cook, Neville G. W. (Lafayette, CA); McEvilly, Thomas V. (Berkeley, CA); Majer, Ernest L. (El Cirrito, CA); Witherspoon, Paul A. (Berkeley, CA)

1992-01-01T23:59:59.000Z

118

Solution to the transverse-phase-space time-dependence problem with LAMPF's high-intensity H/sup +/ beam  

SciTech Connect (OSTI)

The 750 keV H/sup +/ beam at LAMPF has a transverse phase-space time-dependent transient during the first 200 ..mu..s of each 750-..mu..s-long macro-pulse. The time dependence is documented in an earlier report. Further studies indicate that the time dependence is due to space-charge neutralization resulting from secondary emission of electrons produced by collisions of the H/sup +/ and H/sub 2//sup +/ beams on the transport walls. One of several possible solutions has been tested and has proven successful in eliminating the time dependence of the beam entering the linac.

Hurd, J.W.

1983-01-01T23:59:59.000Z

119

3-D seismic velocity and attenuation structures in the geothermal field  

SciTech Connect (OSTI)

We conducted delay time tomography to determine 3-D seismic velocity structures (Vp, Vs, and Vp/Vs ratio) using micro-seismic events in the geothermal field. The P-and S-wave arrival times of these micro-seismic events have been used as input for the tomographic inversion. Our preliminary seismic velocity results show that the subsurface condition of geothermal field can be fairly delineated the characteristic of reservoir. We then extended our understanding of the subsurface physical properties through determining of attenuation structures (Qp, Qs, and Qs/Qp ratio) using micro-seismic waveform. We combined seismic velocities and attenuation structures to get much better interpretation of the reservoir characteristic. Our preliminary attanuation structures results show reservoir characterization can be more clearly by using the 3-D attenuation model of Qp, Qs, and Qs/Qp ratio combined with 3-D seismic velocity model of Vp, Vs, and Vp/Vs ratio.

Nugraha, Andri Dian [Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Jalan Ganesha No. 10 Bandung, 40132 (Indonesia)] [Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Jalan Ganesha No. 10 Bandung, 40132 (Indonesia); Syahputra, Ahmad [Geophyisical Engineering, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Jalan Ganesha No. 10 Bandung, 40132 (Indonesia)] [Geophyisical Engineering, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Jalan Ganesha No. 10 Bandung, 40132 (Indonesia); Fatkhan,; Sule, Rachmat [Applied Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Jalan Ganesha No. 10 Bandung, 40132 (Indonesia)] [Applied Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Jalan Ganesha No. 10 Bandung, 40132 (Indonesia)

2013-09-09T23:59:59.000Z

120

Seismic Design Expectations Report  

Broader source: Energy.gov [DOE]

The Seismic Design Expectations Report (SDER) is a tool that assists DOE federal project review teams in evaluating the technical sufficiency of the project seismic design activities prior to...

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Pseudolocal tomography  

DOE Patents [OSTI]

Local tomographic data is used to determine the location and value of a discontinuity between a first internal density of an object and a second density of a region within the object. A beam of radiation is directed in a predetermined pattern through the region of the object containing the discontinuity. Relative attenuation data of the beam is determined within the predetermined pattern having a first data component that includes attenuation data through the region. The relative attenuation data is input to a pseudo-local tomography function, where the difference between the internal density and the pseudo-local tomography function is computed across the discontinuity. The pseudo-local tomography function outputs the location of the discontinuity and the difference in density between the first density and the second density. 7 figs.

Katsevich, A.J.; Ramm, A.G.

1996-07-23T23:59:59.000Z

122

Pseudolocal tomography  

DOE Patents [OSTI]

Local tomographic data is used to determine the location and value of a discontinuity between a first internal density of an object and a second density of a region within the object. A beam of radiation is directed in a predetermined pattern through the region of the object containing the discontinuity. Relative attenuation data of the beam is determined within the predetermined pattern having a first data component that includes attenuation data through the region. The relative attenuation data is input to a pseudo-local tomography function, where the difference between the internal density and the pseudo-local tomography function is computed across the discontinuity. The pseudo-local tomography function outputs the location of the discontinuity and the difference in density between the first density and the second density.

Katsevich, Alexander J. (Los Alamos, NM); Ramm, Alexander G. (Manhattan, KS)

1996-01-01T23:59:59.000Z

123

Assessing Beyond Design Basis Seismic Events and Implications on Seismic  

Broader source: Energy.gov (indexed) [DOE]

Assessing Beyond Design Basis Seismic Events and Implications on Assessing Beyond Design Basis Seismic Events and Implications on Seismic Risk Assessing Beyond Design Basis Seismic Events and Implications on Seismic Risk September 19, 2012 Presenter: Jeffrey Kimball, Technical Specialist (Seismologist) Defense Nuclear Facilities Safety Board Topics Covered: Department of Energy Approach to Natural Phenomena Hazards Analysis and Design (Seismic) Design Basis and Beyond Design Basis Seismic Events Seismic Risk Implications - Key Parameters and Insights Conclusions Assessing Beyond Design Basis Seismic Events and Implications on Seismic Risk More Documents & Publications DOE's Approach to Nuclear Facility Safety Analysis and Management Results from Beyond Design Basis Event Pilots Idaho National Laboratory Advanced Test Reactor Probabilistic Risk

124

Body Wave Tomography For Regional Scale Assessment Of Geothermal Indicators  

Open Energy Info (EERE)

Body Wave Tomography For Regional Scale Assessment Of Geothermal Indicators Body Wave Tomography For Regional Scale Assessment Of Geothermal Indicators In The Western Great Basin Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Body Wave Tomography For Regional Scale Assessment Of Geothermal Indicators In The Western Great Basin Details Activities (8) Areas (4) Regions (0) Abstract: Body and surface wave tomography are two of the primary methods for estimation of regional scale seismic velocity variations. Seismic velocity is affected by temperature and rock composition in complex ways, but when combined with geologic and structural maps, relative temperature can in some cases be estimated. We present preliminary tomographic models for compressional and shear-wave velocity using local and regional earthquakes recorded by Earthscope Transportable Array stations, network

125

SEISMIC RAY THEORY Seismic Ray Theory presents the most comprehensive treatment of the seismic  

E-Print Network [OSTI]

#12;SEISMIC RAY THEORY Seismic Ray Theory presents the most comprehensive treatment of the seismic ray method available. This method plays an important role in seismology, seismic exploration, and the interpretation of seismic measurements. The book presents a consistent treatment of the seismic ray method, based

Cerveny, Vlastislav

126

COLORADO FRONT RANGE SEISMICITY AND SEISMIC HAZARD  

E-Print Network [OSTI]

; Herrmann, 1981) and secondary oil recovery in western Colorado at the Rangely oil field (Gibbs et al. 1973COLORADO FRONT RANGE SEISMICITY AND SEISMIC HAZARD Anne F. Sheehan University of Colorado at Boulder, 2200 Colorado Avenue, Boulder, CO 80309 John D. Godchaux Trinity University, San Antonio, TX Noah

Sheehan, Anne F.

127

Unitarity Bounds and RG Flows in Time Dependent Quantum Field Theory  

SciTech Connect (OSTI)

We generalize unitarity bounds on operator dimensions in conformal field theory to field theories with spacetime dependent couplings. Below the energy scale of spacetime variation of the couplings, their evolution can strongly affect the physics, effectively shifting the infrared operator scaling and unitarity bounds determined from correlation functions in the theory. We analyze this explicitly for large-N double-trace flows, and connect these to UV complete field theories. One motivating class of examples comes from our previous work on FRW holography, where this effect explains the range of flavors allowed in the dual, time dependent, field theory.

Dong, Xi; Horn, Bart; Silverstein, Eva; Torroba, Gonzalo; /Stanford U., ITP /Stanford U., Phys. Dept. /SLAC

2012-04-05T23:59:59.000Z

128

Measurement of Time-Dependent $CP$ Violation in $B^0\\to ?'K^0$ Decays  

E-Print Network [OSTI]

We present a measurement of the time-dependent $CP$ violation parameters in $B^0\\to\\eta'K^0$ decays. The measurement is based on the full data sample containing $772\\times 10^6$ $B\\bar{B}$ pairs collected at the $\\Upsilon(4S)$ resonance using the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The measured values of the mixing-induced and direct $CP$ violation parameters are: \\begin{align} \\sin 2 \\phi^{\\rm eff}_1 &= +0.68\\pm 0.07 \\pm 0.03, \

Belle Collaboration; L. Šantelj; Y. Yusa; A. Abdesselam; I. Adachi; H. Aihara; S. Al Said; D. M. Asner; V. Aulchenko; T. Aushev; R. Ayad; S. Bahinipati; A. M. Bakich; V. Bansal; V. Bhardwaj; B. Bhuyan; A. Bondar; G. Bonvicini; A. Bozek; M. Bra?ko; T. E. Browder; D. ?ervenkov; V. Chekelian; A. Chen; B. G. Cheon; K. Chilikin; K. Cho; V. Chobanova; Y. Choi; D. Cinabro; J. Dalseno; M. Danilov; Z. Doležal; Z. Drásal; A. Drutskoy; S. Eidelman; H. Farhat; J. E. Fast; T. Ferber; O. Frost; V. Gaur; N. Gabyshev; S. Ganguly; A. Garmash; R. Gillard; R. Glattauer; Y. M. Goh; B. Golob; J. Haba; K. Hara; K. Hayasaka; H. Hayashii; X. H. He; T. Higuchi; W. -S. Hou; H. J. Hyun; K. Inami; A. Ishikawa; R. Itoh; Y. Iwasaki; I. Jaegle; K. K. Joo; H. Kakuno; E. Kato; T. Kawasaki; C. Kiesling; D. Y. Kim; H. J. Kim; J. B. Kim; J. H. Kim; K. T. Kim; M. J. Kim; Y. J. Kim; K. Kinoshita; B. R. Ko; S. Korpar; P. Križan; P. Krokovny; T. Kuhr; T. Kumita; A. Kuzmin; Y. -J. Kwon; J. Li; Y. Li; L. Li Gioi; J. Libby; D. Liventsev; D. Matvienko; K. Miyabayashi; H. Miyata; G. B. Mohanty; A. Moll; T. Mori; E. Nakano; M. Nakao; T. Nanut; Z. Natkaniec; E. Nedelkovska; N. K. Nisar; S. Nishida; S. Ogawa; S. Okuno; S. L. Olsen; P. Pakhlov; G. Pakhlova; H. Park; T. K. Pedlar; R. Pestotnik; M. Petri?; L. E. Piilonen; E. Ribežl; M. Ritter; A. Rostomyan; Y. Sakai; S. Sandilya; T. Sanuki; Y. Sato; V. Savinov; O. Schneider; G. Schnell; C. Schwanda; A. J. Schwartz; K. Senyo; M. E. Sevior; V. Shebalin; C. P. Shen; T. -A. Shibata; J. -G. Shiu; F. Simon; Y. -S. Sohn; A. Sokolov; E. Solovieva; M. Stari?; M. Steder; M. Sumihama; U. Tamponi; G. Tatishvili; Y. Teramoto; K. Trabelsi; M. Uchida; S. Uehara; T. Uglov; Y. Unno; S. Uno; P. Urquijo; S. E. Vahsen; C. Van Hulse; P. Vanhoefer; G. Varner; V. Vorobyev; A. Vossen; M. N. Wagner; C. H. Wang; M. -Z. Wang; P. Wang; X. L. Wang; Y. Watanabe; S. Wehle; K. M. Williams; E. Won; S. Yashchenko; Y. Yook; Z. P. Zhang; V. Zhilich; V. Zhulanov; A. Zupanc

2014-08-26T23:59:59.000Z

129

A simple, time-dependent formula for estimating evaporation rates in Texas  

E-Print Network [OSTI]

AND RECOMMENDATIONS. a. Conclusions. b. Recommendations to the User. c. Reconmendations for Further Research REFERENCES APPENDIX A APPENDIX 8 APPENDIX C APPENDIX D APPENDIX E APPENDIX F APPENDIX G VITA Page 76 79 79 80 81 83 85 86 88 90 92 101...-dependent model with a var1able phase angle, 4 . . 25 26 3. The regression coeff1c1ents, coefficients of determination, and F statistics for the time-dependent model with a constant phase angle, 4 = 0 . 4. The coefficients and coefficients of de- terminat...

Trenchard, Michael Howard

2012-06-07T23:59:59.000Z

130

Fast ground-state cooling of mechanical resonators with time-dependent optical cavities  

SciTech Connect (OSTI)

We propose a feasible scheme to cool down a mechanical resonator (MR) in a three-mirror cavity optomechanical system with controllable external optical driving fields. Under the Born-Oppenheimer approximation, the whole dynamics of the mechanical resonator and cavities is reduced to that of a time-dependent harmonic oscillator, whose effective frequency can be controlled through the optical driving fields. The fast cooling of the MR can be realized by controlling the amplitude of the optical driving fields. Significantly, we further show that the ground-state cooling may be achieved via the three-mirror cavity optomechanical system without the resolved sideband condition.

Li Yong [Department of Physics and Center of Theoretical and Computational Physics, University of Hong Kong, Pokfulam Road (Hong Kong); Beijing Computational Science Research Center, Beijing 100084 (China); Wu Lianao [Department of Theoretical Physics and History of Science, The Basque Country University (EHU/UPV), P.O. Box 644, ES-48080 Bilbao (Spain); IKERBASQUE, Basque Foundation for Science, ES-48011 Bilbao (Spain); Wang, Z. D. [Department of Physics and Center of Theoretical and Computational Physics, University of Hong Kong, Pokfulam Road (Hong Kong)

2011-04-15T23:59:59.000Z

131

New probabilistic modeling and simulation methods for complex time-dependent systems  

SciTech Connect (OSTI)

This paper is a tutorial that presents a new method of modeling the probabilistic description of failure mechanisms in complex, time-dependent systems. The method of modeling employs a state vector differential equation representation of cumulative failure probabilities derived from Markov models associated with certain generic fault trees, and the method automatically includes common cause/common mode statistical dependencies, as well as time-related dependencies not considered in the literature previously. Simulations of these models employ a population dynamics representation of a probability space involving probability particle transitions among the Markov disjoint states. The particle transitions are governed by a random, Monte Carlo selection process.

Bartholomew, R.J.

1985-01-01T23:59:59.000Z

132

Measurement of time dependent fields in high gradient superconducting quadrupoles for the Tevatron  

SciTech Connect (OSTI)

Magnetic field measurements have been performed on prototype and production magnets from two high gradient superconducting quadrupoles designs. One design is a double shell quadrupole with 36 strand Rutherford cable. The other design is a single shell quadrupole with 5 individually monolithic strands connected in series. These magnets have similar bore diameters and cable dimensions. However, there are significant differences between the two designs, as well as differences between prototype and production magnets within each design, with regard to Cu to superconductor ratio, filament diameter and filament spacing to strand diameter. The time dependence of fixed currents of the measured magnetic fields is discussed. 9 refs., 6 figs., 1 tab.

Lamm, M.J.; Coulter, K.; Gourlay, S.; Jaffery, T.S.

1990-10-01T23:59:59.000Z

133

Seismic velocity estimation from time migration  

E-Print Network [OSTI]

Seismic images . . . . . . . . . . . . . . . . .Algorithms producing the seismic velocities from thethe Dix velocities and the true seismic velocities in 2D . .

Cameron, Maria Kourkina

2007-01-01T23:59:59.000Z

134

Seismic Performance Assessment in Dense Urban Environments  

E-Print Network [OSTI]

Kinematic interaction . . 4.4.2 Seismic footing response 6Deterministic seismic hazard analysis . . . . . . . . . .Probabilistic seismic hazard analysis . . . . . . . . .

Mason, Henry Benjamin

2011-01-01T23:59:59.000Z

135

Seismic Fracture Characterization Methods for Enhanced Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

Seismic Fracture Characterization Methods for Enhanced Geothermal Systems Seismic Fracture Characterization Methods for Enhanced Geothermal Systems Project objective: Make Seismic...

136

Accurate Ground-State Energies of Solids and Molecules from Time-Dependent Density-Functional Theory  

E-Print Network [OSTI]

-dissipation theorem with time-dependent density- functional theory. The key ingredient is a renormalization scheme be obtained from time- dependent density-functional theory (TDDFT) through the Dyson equation ð� ¼ KS ð� þ KS density-functional theory (DFT), one needs a rather involved approximation for the xc energy in order

Thygesen, Kristian

137

Time-dependent density functional theory with ultrasoft pseudopotentials: Real-time electron propagation across a molecular junction  

E-Print Network [OSTI]

Time-dependent density functional theory with ultrasoft pseudopotentials: Real-time electron 2006 A practical computational scheme based on time-dependent density functional theory TDDFT density functional theory22 TDDFT . Density functional theory DFT 23 with the Kohn-Sham reference kinetic

Lin, Xi

138

PHYSICAL REVIEW A 85, 052510 (2012) Propagation of initially excited states in time-dependent density-functional theory  

E-Print Network [OSTI]

-dependent density-functional theory Peter Elliott and Neepa T. Maitra Department of Physics and Astronomy, Hunter March 2012; published 22 May 2012) Many recent applications of time-dependent density functional theory-dependent density functional theory (TDDFT) is an exact reformulation of the time-dependent quantum mechanics

139

Dipole oscillations in Bose-Fermi mixtures in the time-dependent Gross-Pitaevskii and Vlasov equations  

E-Print Network [OSTI]

Dipole oscillations in Bose-Fermi mixtures in the time-dependent Gross-Pitaevskii and Vlasov equations Tomoyuki Maruyama1,2,3 and George F. Bertsch1 1 Institute for Nuclear Theory, University with the time-dependent Gross-Pitaevskii equation and the Vlasov equation. While the Bose gas oscillates

Bertsch George F.

140

Regime Transitions of Steady and Time-Dependent Hadley Circulations: Comparison of Axisymmetric and Eddy-Permitting Simulations  

E-Print Network [OSTI]

Regime Transitions of Steady and Time-Dependent Hadley Circulations: Comparison of Axisymmetric August 2009, in final form 25 November 2009) ABSTRACT Steady-state and time-dependent Hadley circulations is progressively displaced off the equator or varied in time to study how the Hadley circulation responds

Bordoni, Simona

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141

Regime transitions of steady and time-dependent Hadley circulations: Comparison of axisymmetric and eddy-permitting simulations  

E-Print Network [OSTI]

Regime transitions of steady and time-dependent Hadley circulations: Comparison of axisymmetric of the Atmospheric Sciences. Revised 25 November 2009) ABSTRACT Steady-state and time-dependent Hadley circulations is progressively displaced off the equator or varied in time to study how the Hadley circulation responds

Heaton, Thomas H.

142

Doppler Tomography  

E-Print Network [OSTI]

I review the method of Doppler tomography which translates binary-star line profiles taken at a series of orbital phases into a distribution of emission over the binary. I begin with a discussion of the basic principles behind Doppler tomography, including a comparison of the relative merits of maximum entropy regularisation versus filtered back-projection for implementing the inversion. Following this I discuss the issue of noise in Doppler images and possible methods for coping with it. Then I move on to look at the results of Doppler Tomography applied to cataclysmic variable stars. Outstanding successes to date are the discovery of two-arm spiral shocks in cataclysmic variable accretion discs and the probing of the stream/magnetospheric interaction in magnetic cataclysmic variable stars. Doppler tomography has also told us much about the stream/disc interaction in non-magnetic systems and the irradiation of the secondary star in all systems. The latter indirectly reveals such effects as shadowing by the accretion disc or stream. I discuss all of these and finish with some musings on possible future directions for the method. At the end I include a tabulation of Doppler maps published in refereed journals.

T. R. Marsh

2000-11-01T23:59:59.000Z

143

Current density partitioning in time-dependent current density functional theory  

SciTech Connect (OSTI)

We adapt time-dependent current density functional theory to allow for a fragment-based solution of the many-electron problem of molecules in the presence of time-dependent electric and magnetic fields. Regarding a molecule as a set of non-interacting subsystems that individually evolve under the influence of an auxiliary external electromagnetic vector-scalar potential pair, the partition 4-potential, we show that there are one-to-one mappings between this auxiliary potential, a sharply-defined set of fragment current densities, and the total current density of the system. The partition electromagnetic (EM) 4-potential is expressed in terms of the real EM 4-potential of the system and a gluing EM 4-potential that accounts for exchange-correlation effects and mutual interaction forces between fragments that are required to yield the correct electron dynamics. We prove the zero-force theorem for the fragmented system, establish a variational formulation in terms of action functionals, and provide a simple illustration for a charged particle in a ring.

Mosquera, Martín A. [Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States)] [Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States); Wasserman, Adam, E-mail: awasser@purdue.edu [Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States) [Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States); Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)

2014-05-14T23:59:59.000Z

144

Beyond the pseudo-time-dependent approach: chemical models of dense core precursors  

E-Print Network [OSTI]

Context: Chemical models of dense cloud cores often utilize the so-called pseudo-time-dependent approximation, in which the physical conditions are held fixed and uniform as the chemistry occurs. In this approximation, the initial abundances chosen, which are totally atomic in nature except for molecular hydrogen, are artificial. A more detailed approach to the chemistry of dense cold cores should include the physical evolution during their early stages of formation. Aims: Our major goal is to investigate the initial synthesis of molecular ices and gas-phase molecules as cold molecular gas begins to form behind a shock in the diffuse interstellar medium. The abundances calculated as the conditions evolve can then be utilized as reasonable initial conditions for a theory of the chemistry of dense cores. Methods: Hydrodynamic shock-wave simulations of the early stages of cold core formation are used to determine the time-dependent physical conditions for a gas-grain chemical network. We follow the cold post-sho...

Hassel, G E; Bergin, E A

2010-01-01T23:59:59.000Z

145

Incorporation of particle collisions in the time-dependent Hartree-Fock approximation  

SciTech Connect (OSTI)

In the time-dependent Hartree-Fock (TDHF) approximation, particles interact only through the mean field, and the collisions between particles are not included. Previously, we formulated the extended time-dependent Hartree-Fock (ETDHF) approximation to include particle collisions in terms of a temporal variation of the occupation probability n/sub lambda/ for the single-particle states. In the simplest approximation, the single-particle potential is modified only through the particle density which depends on n/sub lambda/. We wish to refine the extended TDHF approximation by studying how particle collisions affect the single-particle potential. We find that it acquires two second-order contributions which are state-dependent and are the generalization of the core polarization and correlation contributions one encounters in the study of the nucleon-nucleus optical potentials. In consequence, concepts such as energy-dependent single-particle potentials and effective masses may be properly introduced in the extended TDHF approximation. We also wish to review the conservation of energy in the ETDHF approximation. We find that the total energy should include a second-order contribution due to correlations arising from particle collisions.

Wong, C.Y.

1982-01-01T23:59:59.000Z

146

Problem-free time-dependent variational principle for open quantum systems  

E-Print Network [OSTI]

Methods of quantum nuclear wave-function dynamics have become very efficient in simulating large isolated systems using the time-dependent variational principle (TDVP). However, a straightforward extension of the TDVP to the density matrix framework gives rise to methods that do not conserve the energy in the isolated system limit and the total system population for open systems where only energy exchange with the environment is allowed. These problems arise when the system density is in a mixed state and is simulated using an incomplete basis. Thus, the basis set incompleteness, which is inevitable in practical calculations, creates artificial channels for energy and population dissipation. To overcome this unphysical behavior, we have introduced a constrained Lagrangian formulation of TDVP applied to the non-stochastic open system Schrodinger equation (NOSSE) [L. Joubert-Doriol, I. G. Ryabinkin, and A. F. Izmaylov, J. Chem. Phys. 141, 234112 (2014)]. While our formulation can be applied to any variational a...

Joubert-Doriol, Loic

2015-01-01T23:59:59.000Z

147

The CLIC Study of Magnet Stability and Time-dependent Luminosity Performance  

E-Print Network [OSTI]

The present parameters of the CLIC study require the collision of small emittance beams with a vertical spot size of 1 nm. The tolerances on vertical quadrupole vi-bration (above a few Hz) are as small as a few nm in the linac and most of the Final Focus. The final focusing quadrupole has a stability requirement of 4 nm in the horizontal and 0.2 nm in the vertical direction. Those tol-erances can only be achieved with the use of damped support structures for CLIC. A study has been set-up at CERN to explore the application of stabilization devices from specialized industry and to predict the time-dependent luminosity performance for CLIC. The results will guide the specification of required technological im-provements and will help to verify the feasibility of the present CLIC parameters.

Aleksa, Martin; Coosemans, Williame; Guignard, Gilbert; Leros, Nicolas; Mayoud, Michel; Redaelli, S; Ruggiero, F; Russenschuck, Stephan; Schulte, Daniel; Wilson, Ian H; Zimmermann, Frank

2001-01-01T23:59:59.000Z

148

Effective electron displacements: A tool for time-dependent density functional theory computational spectroscopy  

SciTech Connect (OSTI)

We extend our previous definition of the metric ?r for electronic excitations in the framework of the time-dependent density functional theory [C. A. Guido, P. Cortona, B. Mennucci, and C. Adamo, J. Chem. Theory Comput. 9, 3118 (2013)], by including a measure of the difference of electronic position variances in passing from occupied to virtual orbitals. This new definition, called ?, permits applications in those situations where the ?r-index is not helpful: transitions in centrosymmetric systems and Rydberg excitations. The ?-metric is then extended by using the Natural Transition Orbitals, thus providing an intuitive picture of how locally the electron density changes during the electronic transitions. Furthermore, the ? values give insight about the functional performances in reproducing different type of transitions, and allow one to define a “confidence radius” for GGA and hybrid functionals.

Guido, Ciro A., E-mail: ciro.guido@ecp.fr; Cortona, Pietro [Laboratoire Structures, Propriétés et Modélisation des Solides (SPMS), CNRS UMR 8580, École Centrale Paris, Grande Voie des Vignes, F-92295 Châtenay-Malabry (France)] [Laboratoire Structures, Propriétés et Modélisation des Solides (SPMS), CNRS UMR 8580, École Centrale Paris, Grande Voie des Vignes, F-92295 Châtenay-Malabry (France); Adamo, Carlo [Laboratoire d’Électrochimie, Chimie des Interfaces et Modélisation pour l’Energie, CNRS UMR-7575, Chimie ParisTech, 11 rue P. et M. Curie, F-75231 Paris Cedex 05 (France) [Laboratoire d’Électrochimie, Chimie des Interfaces et Modélisation pour l’Energie, CNRS UMR-7575, Chimie ParisTech, 11 rue P. et M. Curie, F-75231 Paris Cedex 05 (France); Institut Universitaire de France, 103 Bd Saint-Michel, F-75005 Paris (France)

2014-03-14T23:59:59.000Z

149

A cyclic time-dependent Markov process to model daily patterns in wind turbine power production  

E-Print Network [OSTI]

Wind energy is becoming a top contributor to the renewable energy mix, which raises potential reliability issues for the grid due to the fluctuating nature of its source. To achieve adequate reserve commitment and to promote market participation, it is necessary to provide models that can capture daily patterns in wind power production. This paper presents a cyclic inhomogeneous Markov process, which is based on a three-dimensional state-space (wind power, speed and direction). Each time-dependent transition probability is expressed as a Bernstein polynomial. The model parameters are estimated by solving a constrained optimization problem: The objective function combines two maximum likelihood estimators, one to ensure that the Markov process long-term behavior reproduces the data accurately and another to capture daily fluctuations. A convex formulation for the overall optimization problem is presented and its applicability demonstrated through the analysis of a case-study. The proposed model is capable of r...

Scholz, Teresa; Estanqueiro, Ana

2013-01-01T23:59:59.000Z

150

Chemical dynamics in the gas phase: Time-dependent quantum mechanics of chemical reactions  

SciTech Connect (OSTI)

A major goal of this research is to obtain an understanding of the molecular reaction dynamics of three and four atom chemical reactions using numerically accurate quantum dynamics. This work involves: (i) the development and/or improvement of accurate quantum mechanical methods for the calculation and analysis of the properties of chemical reactions (e.g., rate constants and product distributions), and (ii) the determination of accurate dynamical results for selected chemical systems, which allow one to compare directly with experiment, determine the reliability of the underlying potential energy surfaces, and test the validity of approximate theories. This research emphasizes the use of recently developed time-dependent quantum mechanical methods, i.e. wave packet methods.

Gray, S.K. [Argonne National Laboratory, IL (United States)

1993-12-01T23:59:59.000Z

151

Multiconfiguration time-dependent Hartree-Fock treatment of electronic and nuclear dynamics in diatomic molecules  

SciTech Connect (OSTI)

The multiconfiguration time-dependent Hartree-Fock (MCTDHF) method is formulated for treating the coupled electronic and nuclear dynamics of diatomic molecules without the Born-Oppenheimer approximation. The method treats the full dimensionality of the electronic motion, uses no model interactions, and is in principle capable of an exact nonrelativistic description of diatomics in electromagnetic fields. An expansion of the wave function in terms of configurations of orbitals whose dependence on internuclear distance is only that provided by the underlying prolate spheroidal coordinate system is demonstrated to provide the key simplifications of the working equations that allow their practical solution. Photoionization cross sections are also computed from the MCTDHF wave function in calculations using short pulses.

Haxton, D. J.; Lawler, K. V. [Chemical Sciences and Ultrafast X-ray Science Laboratory, Lawrence Berkeley National Laboratory, Berkeley, California, 94720 (United States); McCurdy, C. W. [Chemical Sciences and Ultrafast X-ray Science Laboratory, Lawrence Berkeley National Laboratory, Berkeley, California, 94720 (United States); Departments of Applied Science and Chemistry, Davis, California, 95616 (United States)

2011-06-15T23:59:59.000Z

152

Wave function for harmonically confined electrons in time-dependent electric and magnetostatic fields  

SciTech Connect (OSTI)

We derive via the interaction “representation” the many-body wave function for harmonically confined electrons in the presence of a magnetostatic field and perturbed by a spatially homogeneous time-dependent electric field—the Generalized Kohn Theorem (GKT) wave function. In the absence of the harmonic confinement – the uniform electron gas – the GKT wave function reduces to the Kohn Theorem wave function. Without the magnetostatic field, the GKT wave function is the Harmonic Potential Theorem wave function. We further prove the validity of the connection between the GKT wave function derived and the system in an accelerated frame of reference. Finally, we provide examples of the application of the GKT wave function.

Zhu, Hong-Ming; Chen, Jin-Wang; Pan, Xiao-Yin, E-mail: panxiaoyin@nbu.edu.cn [Department of Physics, Ningbo University, Ningbo 315211 (China)] [Department of Physics, Ningbo University, Ningbo 315211 (China); Sahni, Viraht [Department of Physics, Brooklyn College and The Graduate School of the City University of New York, New York, New York 10016 (United States)] [Department of Physics, Brooklyn College and The Graduate School of the City University of New York, New York, New York 10016 (United States)

2014-01-14T23:59:59.000Z

153

High Harmonic Generation and Polarization: Angular Momentum Conservation vs Discrete Time-Dependent Symmetries  

E-Print Network [OSTI]

We discuss the place of angular momentum conservation in theoretical and numerical models for high harmonic generation (HHG). Recent experimental work [A. Fleischer et al., Nature Photonics 8, 543 (2014)] has shown conflicting results regarding the conservation of the (photon) angular momentum in HHG. Here we show that simulations using classical (laser and HHG) fields do not conserve angular momentum and that the properties of HHG spectra are actually due to more general discrete time-dependent symmetries that apply equally well for atoms and molecules (here illustrated with He, H3+, Ne+ and H2 models). To conclude, we propose a configuration to test for the accuracy of these simulations compared to selection rule predictions.

Mauger, F; Uzer, T

2015-01-01T23:59:59.000Z

154

Time-dependent simulation of prebunched one and two-beam free electron laser  

SciTech Connect (OSTI)

A numerical simulation in one-dimension is conducted to study the slippage effects on prebunched free electron laser. A technique for the simulation of time dependent free electron lasers (FEL) to model the slippage effects is introduced, and the slowly varying envelope approximation in both z and t is used to illustrate the temporal behaviour in the prebunched FEL. Slippage effect on prebunched two-beam FEL is compared with the one-beam modeling. The evaluation of the radiation pulse energy, thermal and phase distribution, and radiation pulse shape in one-beam and two-beam modeling is studied. It was shown that the performance is considerably undermined when the slippage time is comparable to the pulse duration. However, prebunching reduces the slippage. Prebunching also leads to the radiation pulse with a single smooth spike.

Mirian, N. S., E-mail: najmeh.mirian@ipm.ir [School of Particle and Accelerator Physics, Institute for Research in Fundamental Sciences (IPM), Post code 19395-5531 Tehran (Iran, Islamic Republic of); Maraghechi, B. [Department of Physics, Amirkabir University of Technology, Post code 15875-4413 Tehran (Iran, Islamic Republic of)] [Department of Physics, Amirkabir University of Technology, Post code 15875-4413 Tehran (Iran, Islamic Republic of)

2014-04-15T23:59:59.000Z

155

Time-Dependent Green's Functions Description of One-Dimensional Nuclear Mean-Field Dynamics  

SciTech Connect (OSTI)

The time-dependent Green's functions formalism provides a consistent description of the time evolution of quantum many-body systems, either in the mean-field approximation or in more sophisticated correlated approaches. We describe an attempt to apply this formalism to the mean-field dynamics of symmetric reactions for one-dimensional nuclear slabs. We pay particular attention to the off-diagonal elements of the Green's functions in real space representation. Their importance is quantified by means of an elimination scheme based on a super-operator cut-off field and their relevance for the global time evolution is assessed. The Wigner function and its structure in the mean-field approximation is also discussed.

Rios, Arnau; Danielewicz, Pawel; Barker, Brent [National Superconducting Cyclotron Laboratory, and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1321 (United States)

2009-05-07T23:59:59.000Z

156

Short- and Long- Time Transport Structures in a Three Dimensional Time Dependent Flow  

E-Print Network [OSTI]

Lagrangian transport structures for three-dimensional and time-dependent fluid flows are of great interest in numerous applications, particularly for geophysical or oceanic flows. In such flows, chaotic transport and mixing can play important environmental and ecological roles, for examples in pollution spills or plankton migration. In such flows, where simulations or observations are typically available only over a short time, understanding the difference between short-time and long-time transport structures is critical. In this paper, we use a set of classical (i.e. Poincar\\'e section, Lyapunov exponent) and alternative (i.e. finite time Lyapunov exponent, Lagrangian coherent structures) tools from dynamical systems theory that analyze chaotic transport both qualitatively and quantitatively. With this set of tools we are able to reveal, identify and highlight differences between short- and long-time transport structures inside a flow composed of a primary horizontal contra-rotating vortex chain, small later...

Chabreyrie, Rodolphe

2014-01-01T23:59:59.000Z

157

Multi-fluid transport code modeling of time-dependent recycling in ELMy H-mode  

SciTech Connect (OSTI)

Simulations of a high-confinement-mode (H-mode) tokamak discharge with infrequent giant type-I ELMs are performed by the multi-fluid, multi-species, two-dimensional transport code UEDGE-MB, which incorporates the Macro-Blob approach for intermittent non-diffusive transport due to filamentary coherent structures observed during the Edge Localized Modes (ELMs) and simple time-dependent multi-parametric models for cross-field plasma transport coefficients and working gas inventory in material surfaces. Temporal evolutions of pedestal plasma profiles, divertor recycling, and wall inventory in a sequence of ELMs are studied and compared to the experimental time-dependent data. Short- and long-time-scale variations of the pedestal and divertor plasmas where the ELM is described as a sequence of macro-blobs are discussed. It is shown that the ELM recovery includes the phase of relatively dense and cold post-ELM divertor plasma evolving on a several ms scale, which is set by the transport properties of H-mode barrier. The global gas balance in the discharge is also analyzed. The calculated rates of working gas deposition during each ELM and wall outgassing between ELMs are compared to the ELM particle losses from the pedestal and neutral-beam-injection fueling rate, correspondingly. A sensitivity study of the pedestal and divertor plasmas to model assumptions for gas deposition and release on material surfaces is presented. The performed simulations show that the dynamics of pedestal particle inventory is dominated by the transient intense gas deposition into the wall during each ELM followed by continuous gas release between ELMs at roughly a constant rate.

Pigarov, A. Yu.; Krasheninnikov, S. I.; Hollmann, E. M. [University of California at San Diego, La Jolla, California 92093 (United States); Rognlien, T. D.; Lasnier, C. J. [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States); Unterberg, E. [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

2014-06-15T23:59:59.000Z

158

Multi-fluid transport code modeling of time-dependent recycling in ELMy H-mode  

SciTech Connect (OSTI)

Simulations of a high-confinement-mode (H-mode) tokamak discharge with infrequent giant type-I ELMs are performed by the multi-fluid, multi-species, two-dimensional transport code UEDGE-MB, which incorporates the Macro-Blob approach for intermittent non-diffusive transport due to filamentary coherent structures observed during the Edge Localized Modes (ELMs) and simple time-dependent multi-parametric models for cross-field plasma transport coefficients and working gas inventory in material surfaces. Temporal evolutions of pedestal plasma profiles, divertor recycling, and wall inventory in a sequence of ELMs are studied and compared to the experimental time-dependent data. Short- and long-time-scale variations of the pedestal and divertor plasmas where the ELM is described as a sequence of macro-blobs are discussed. It is shown that the ELM recovery includes the phase of relatively dense and cold post-ELM divertor plasma evolving on a several ms scale, which is set by the transport properties of H-mode barrier. The global gas balance in the discharge is also analyzed. The calculated rates of working gas deposition during each ELM and wall outgassing between ELMs are compared to the ELM particle losses from the pedestal and neutral-beam-injection fueling rate, correspondingly. A sensitivity study of the pedestal and divertor plasmas to model assumptions for gas deposition and release on material surfaces is presented. The performed simulations show that the dynamics of pedestal particle inventory is dominated by the transient intense gas deposition into the wall during each ELM followed by continuous gas release between ELMs at roughly a constant rate.

Pigarov, A. Yu. [University of California, San Diego; Krasheninnikov, S. I. [University of California, La Jolla; Rognlien, T. D. [Lawrence Livermore National Laboratory (LLNL); Hollmann, E. M. [University of California, San Diego; Lasnier, C. J. [Lawrence Livermore National Laboratory (LLNL); Unterberg, Ezekial A [ORNL

2014-01-01T23:59:59.000Z

159

Seismic Isolation and Decrease of Seismic Effects on Bridges  

Science Journals Connector (OSTI)

A planned road bridge in an active seismic zone near the city of Žilina in Slovakia was analysed for seismic effects. The seismic analysis has shown that an inelastic structural ... is very likely. Because of the...

Associate Professor Rudolf Ároch…

2014-01-01T23:59:59.000Z

160

A Global Time-Dependent Model of Thunderstorm Electricity. Part I: Mathematical Properties of the Physical and Numerical Models  

Science Journals Connector (OSTI)

A time-dependent model that simulates the interaction of a thunderstorm with its electrical environment is introduced. The model solves the continuity equation of the Maxwell current density that includes conduction, displacement, and source ...

G. L. Browning; I. Tzur; R. G. Roble

1987-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Time-Dependent Properties of Liquid Water:? A Comparison of Car?Parrinello and Born?Oppenheimer Molecular Dynamics Simulations  

Science Journals Connector (OSTI)

Time-Dependent Properties of Liquid Water:? A Comparison of Car?Parrinello and Born?Oppenheimer Molecular Dynamics Simulations ... Dynamical information of water interacting with its local environment can be gleaned from the vibrational power spectrum. ...

I-Feng W. Kuo; Christopher J. Mundy; Matthew J. McGrath; J. Ilja Siepmann

2006-07-27T23:59:59.000Z

162

Seismic characterization of fractures  

E-Print Network [OSTI]

Seismic characterization of fractures. José M. Carcione, OGS, Italy. Fractured geological formations are generally represented with a stress-strain relation.

JM Carcione

2014-06-07T23:59:59.000Z

163

Seismic Imaging and Monitoring  

SciTech Connect (OSTI)

I give an overview of LANL's capability in seismic imaging and monitoring. I present some seismic imaging and monitoring results, including imaging of complex structures, subsalt imaging of Gulf of Mexico, fault/fracture zone imaging for geothermal exploration at the Jemez pueblo, time-lapse imaging of a walkway vertical seismic profiling data for monitoring CO{sub 2} inject at SACROC, and microseismic event locations for monitoring CO{sub 2} injection at Aneth. These examples demonstrate LANL's high-resolution and high-fidelity seismic imaging and monitoring capabilities.

Huang, Lianjie [Los Alamos National Laboratory

2012-07-09T23:59:59.000Z

164

Design and Implementation of BCM Rule Based on Spike-Timing Dependent Plasticity  

E-Print Network [OSTI]

The Bienenstock-Cooper-Munro (BCM) and Spike Timing-Dependent Plasticity (STDP) rules are two experimentally verified form of synaptic plasticity where the alteration of synaptic weight depends upon the rate and the timing of pre- and post-synaptic firing of action potentials, respectively. Previous studies have reported that under specific conditions, i.e. when a random train of Poissonian distributed spikes are used as inputs, and weight changes occur according to STDP, it has been shown that the BCM rule is an emergent property. Here, the applied STDP rule can be either classical pair-based STDP rule, or the more powerful triplet-based STDP rule. In this paper, we demonstrate the use of two distinct VLSI circuit implementations of STDP to examine whether BCM learning is an emergent property of STDP. These circuits are stimulated with random Poissonian spike trains. The first circuit implements the classical pair-based STDP, while the second circuit realizes a previously described triplet-based STDP rule. T...

Azghadi, Mostafa Rahimi; Iannella, Nicolangelo; Abbott, Derek

2012-01-01T23:59:59.000Z

165

Photon and neutrino spectra of time-dependent photospheric models of gamma-ray bursts  

SciTech Connect (OSTI)

Thermal photons from the photosphere may be the primary source of the observed prompt emission of gamma-ray bursts (GRBs). In order to produce the observed non-thermal spectra, some kind of dissipation mechanism near the photosphere is required. In this paper we numerically simulate the evolution of the photon spectrum in a relativistically expanding shell with a time-dependent numerical code. We consider two basic models. One is a leptonic model, where a dissipation mechanism heats the thermal electrons maintaining their high temperature. The other model involves a cascade process induced by pp(pn)-collisions which produce high-energy electrons, modify the thermal spectrum, and emit neutrinos. The qualitative properties of the photon spectra are mainly determined by the optical depth at which the dissipation mechanism sets in. Too large optical depths lead to a broad and curved spectrum contradicting the observations, while for optical depths smaller than unity the spectral hardness becomes softer than observed. A significant shift of the spectral peak energy to higher energies due to a large energy injection can lead to an overly broad spectral shape. We show ideal parameter ranges for which these models are able to reproduce the observed spectra. For the pn-collision model, the neutrino fluence in the 10–100 GeV range is well above the atmospheric neutrino fluence, but its detection is challenging for presently available detectors.

Asano, K. [Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582 (Japan); Mészáros, P., E-mail: asanok@icrr.u-tokyo.ac.jp, E-mail: nnp@astro.psu.edu [Department of Astronomy and Astrophysics, Department of Physics, Center for Particle and Gravitational Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)

2013-09-01T23:59:59.000Z

166

A TIME-DEPENDENT METHOD FOR CHARACTERIZING THE DIFFUSION OF RADON-222 IN CONCRETE  

SciTech Connect (OSTI)

The porosity and diffusion length of concrete have been determined by measuring the time-dependent diffusion of radon through a thin slab of the material, One surface of the slab is exposed to a large, fixed radon concentration beginning at t=0. The radon that diffuses out of a portion of the opposite surface is collected during several contiguous time intervals. The total activity collected over a set of intervals beginning at t=0 and the steady-state flux of activity are used to calculate the porosity and diffusion length, As a test of these parameters, they are then used to predict the activity collected during other time intervals and for other sample thicknesses, Samples from two types of concrete were tested: one type yielded a porosity of 0.068 and a diffusion length of 12.6 cm; the respective values for the other were 0.32 and 16.9 cm. The predicted and experimental results agreed well, thereby verifying the assumption that concrete may be treated as a homogenous diffusion medium for radon.

Zapalac, Geordie H.

1981-07-01T23:59:59.000Z

167

Fusion process studied with preequilibrium giant dipole resonance in time dependent Hartree-Fock theory  

E-Print Network [OSTI]

The equilibration of macroscopic degrees of freedom during the fusion of heavy nuclei, like the charge and the shape, are studied in the Time-Dependent Hartree-Fock theory. The pre-equilibrium Giant Dipole Resonance (GDR) is used to probe the fusion path. It is shown that such isovector collective state is excited in N/Z asymmetric fusion and to a less extent in mass asymmetric systems. The characteristics of this GDR are governed by the structure of the fused system in its preequilibrium phase, like its deformation, rotation and vibration. In particular, we show that a lowering of the pre-equilibrium GDR energy is expected as compared to the statistical one. Revisiting experimental data, we extract an evidence of this lowering for the first time. We also quantify the fusion-evaporation enhancement due to gamma-ray emission from the pre-equilibrium GDR. This cooling mechanism along the fusion path may be suitable to synthesize in the future super heavy elements using radioactive beams with strong N/Z asymmetries in the entrance channel.

Cédric Simenel; Philippe Chomaz; Gilles De France

2007-04-04T23:59:59.000Z

168

Time dependent evolution of RF-generated non-thermal particle distributions in fusion plasmas  

Science Journals Connector (OSTI)

We describe fully self-consistent time-dependent simulations of radio frequency (RF) generated ion distributions in the ion cyclotron range of frequencies and RF-generated electron distributions in the lower hybrid range of frequencies using combined Fokker–Planck and full wave electromagnetic field solvers. In each regime, the non-thermal particle distributions have been used in synthetic diagnostic codes to compare with diagnostic measurements from experiment, thus providing validation of the simulation capability. The computational intensive simulations require multiple full wave code runs that iterate with a Fokker–Planck code. We will discuss advanced algorithms that have been implemented to accelerate both the massively parallel full wave simulations as well as the iteration with the distribution code. A vector extrapolation method (Sidi A 2008 Comput. Math. Appl. 56) that permits Jacobian-free acceleration of the traditional fixed point iteration technique is used to reduce the number of iterations needed between the distribution and wave codes to converge to self-consistency. The computational burden of the parallel full wave codes has been reduced by using a more efficient two level parallel decomposition that improves the strong scaling of the codes and reduces the communication overhead.

J C Wright; A Bader; L A Berry; P T Bonoli; R W Harvey; E F Jaeger; J-P Lee; A Schmidt; E D'Azevedo; I Faust; C K Phillips; E Valeo

2014-01-01T23:59:59.000Z

169

Validating a Time-Dependent Wave-Turbulence-Driven Model of the Solar Wind  

E-Print Network [OSTI]

Although the mechanisms responsible for heating the Sun's corona and accelerating the solar wind are still being actively investigated, it is largely accepted that photospheric motions provide the energy source and that the magnetic field must play a key role in the process. \\citet{2010ApJ...708L.116V} presented a model for heating and accelerating the solar wind based on the turbulent dissipation of Alfv\\'en waves. We first use a time-dependent model of the solar wind to reproduce one of \\citeauthor{2010ApJ...708L.116V}'s solutions; then we extend its application to the case when the energy equation includes thermal conduction and radiation losses, and the upper chromosphere is part of the computational domain. Using this model, we explore parameter space and describe the characteristics of a fast-solar-wind solution. We discuss how this formulation may be applied to a 3D MHD model of the coron a and solar wind \\citep{2009ApJ...690..902L}.

Lionello, Roberto; Downs, Cooper; Linker, Jon A; Miki?, Zoran; Verdini, Andrea

2014-01-01T23:59:59.000Z

170

Seismic image waves  

Science Journals Connector (OSTI)

......involved in the seismic imaging process, for example the migration...revisited, 60th Ann. Int. Mtg., Soc. Expl. Geophys...involved in the seismic imaging process, for example the migration...revisited, 60th Ann. Int. Mtg., SOC. Expl. Geophys......

Peter Hubral; Martin Tygel; Jörg Schleicher

1996-05-01T23:59:59.000Z

171

New Paradigm for Seismic Networks: Crowd-Sourced Seismic Networks,  

E-Print Network [OSTI]

#12;New Paradigm for Seismic Networks: Crowd-Sourced Seismic Networks, including Buildings Tom Egill Hauksson #12;SCSN: what does it encompass? · ~360 Seismic Stations · ~60 stations from partners SCSN/SCEDC total of ~26 FTE's #12;Crowd Sourced Networks · Current broadband seismic network

Greer, Julia R.

172

Modeling the doubly excited state with time-dependent Hartree–Fock and density functional theories  

Science Journals Connector (OSTI)

Multielectron excited states have become a hot topic in many cutting-edge research fields such as the photophysics of polyenes and in the possibility of multiexciton generation in quantum dots for the purpose of increasing solar cell efficiency. However obtaining multielectron excited states has been a major obstacle as it is often done with multiconfigurational methods which involve formidable computational cost for large systems. Although they are computationally much cheaper than multiconfigurational wave function based methods linear response adiabatic time-dependent Hartree–Fock (TDHF) and density functional theory (TDDFT) are generally considered incapable of obtaining multielectron excited states. We have developed a real-time TDHF and adiabatic TDDFT approach that is beyond the perturbative regime. We show that TDHF/TDDFT is able to simultaneously excite two electrons from the ground state to the doubly excited state and that the real-time TDHF/TDDFT implicitly includes double excitation within a superposition state. We also present a multireference linear response theory to show that the real-time electron density response corresponds to a superposition of perturbative linear responses of the S 0 and S 2 states. As a result the energy of the two-electron doubly excited state can be obtained with several different approaches. This is done within the adiabatic approximation of TDDFT a realm in which the doubly excited state has been deemed missing. We report results on simple two-electron systems including the energies and dipole moments for the two-electron excited states of H 2 and He H + . These results are compared to those obtained with the full configuration interaction method.

Christine M. Isborn; Xiaosong Li

2008-01-01T23:59:59.000Z

173

DIAGNOSING THE TIME DEPENDENCE OF ACTIVE REGION CORE HEATING FROM THE EMISSION MEASURE. II. NANOFLARE TRAINS  

SciTech Connect (OSTI)

The time dependence of heating in solar active regions can be studied by analyzing the slope of the emission measure distribution coolward of the peak. In a previous study we showed that low-frequency heating can account for 0% to 77% of active region core emission measures. We now turn our attention to heating by a finite succession of impulsive events for which the timescale between events on a single magnetic strand is shorter than the cooling timescale. We refer to this scenario as a 'nanoflare train' and explore a parameter space of heating and coronal loop properties with a hydrodynamic model. Our conclusions are (1) nanoflare trains are consistent with 86% to 100% of observed active region cores when uncertainties in the atomic data are properly accounted for; (2) steeper slopes are found for larger values of the ratio of the train duration {Delta} {sub H} to the post-train cooling and draining timescale {Delta} {sub C}, where {Delta} {sub H} depends on the number of heating events, the event duration and the time interval between successive events ({tau} {sub C}); (3) {tau} {sub C} may be diagnosed from the width of the hot component of the emission measure provided that the temperature bins are much smaller than 0.1 dex; (4) the slope of the emission measure alone is not sufficient to provide information about any timescale associated with heating-the length and density of the heated structure must be measured for {Delta} {sub H} to be uniquely extracted from the ratio {Delta} {sub H}/{Delta} {sub C}.

Reep, J. W.; Bradshaw, S. J. [Department of Physics and Astronomy, Rice University, Houston, TX 77005 (United States)] [Department of Physics and Astronomy, Rice University, Houston, TX 77005 (United States); Klimchuk, J. A., E-mail: jeffrey.reep@rice.edu, E-mail: stephen.bradshaw@rice.edu, E-mail: james.a.klimchuk@nasa.gov [NASA Goddard Space Flight Center, Solar Physics Lab., Code 671, 8800 Greenbelt Road, Greenbelt, MD 20771 (United States)

2013-02-20T23:59:59.000Z

174

Decoherent time-dependent transport beyond Landauer-Büttiker: a Quantum Drift alternative to Quantum Jumps  

E-Print Network [OSTI]

We present a model for decoherence in time-dependent transport. It boils down into a form of wave function that undergoes a smooth stochastic drift of the phase in a local basis, the Quantum Drift (QD) model. This drift is nothing else but a local energy fluctuation. Unlike Quantum Jumps (QJ) models, no jumps are present in the density as the evolution is unitary. As a first application, we address the transport through a resonant state $\\left\\vert 0\\right\\rangle $ that undergoes decoherence. We show the equivalence with the decoherent steady state transport in presence of a B\\"{u}ttiker's voltage probe. In order to test the dynamics, we consider two many-spin systems whith a local energy fluctuation. A two-spin system is reduced to a two level system (TLS) that oscillates among $\\left\\vert 0\\right\\rangle $ $\\equiv $ $ \\left\\vert \\uparrow \\downarrow \\right\\rangle $ and $\\left\\vert 1\\right\\rangle \\equiv $ $\\left\\vert \\downarrow \\uparrow \\right\\rangle $. We show that QD model recovers not only the exponential damping of the oscillations in the low perturbation regime, but also the non-trivial bifurcation of the damping rates at a critical point, i.e. the quantum dynamical phase transition. We also address the spin-wave like dynamics of local polarization in a spin chain. The QD average solution has about half the dispersion respect to the mean dynamics than QJ. By evaluating the Loschmidt Echo (LE), we find that the pure states $\\left\\vert 0\\right\\rangle $ and $\\left\\vert 1\\right \\rangle $ are quite robust against the local decoherence. In contrast, the LE, and hence coherence, decays faster when the system is in a superposition state. Because its simple implementation, the method is well suited to assess decoherent transport problems as well as to include decoherence in both one-body and many-body dynamics.

Lucas J. Fernández-Alcázar; Horacio M. Pastawski

2015-01-26T23:59:59.000Z

175

Summer drought in northern midlatitudes in a time-dependent CO{sub 2} climate experiment  

SciTech Connect (OSTI)

A time-dependent climate-change experiment with a coupled ocean-atmosphere general circulation model has been used to study changes in the occurrence of drought in summer in southern Europe and central North America. In both regions, precipitation and soil moisture are reduced in a climate of greater atmospheric carbon dioxide. A detailed investigation of the hydrology of the model shows that the drying of the soil comes about through an increase in evaporation in winter and spring, caused by higher temperatures and reduced snow cover, and a decrease in the net input of water in summer. Evaporation is reduced in summer because of the drier soil, but the reduction in precipitation is larger. Three extreme statistics are used to define drought, namely the frequency of low summer precipitation, the occurrence of long dry spells, and the probability of dry soil. The last of these is arguably of the greatest practical importance, but since it is based on soil moisture, of which there are very few observations, the authors` simulation of it has the least confidence. Furthermore, long time series for daily observed precipitation are not readily available from a sufficient number of stations to enable a thorough evaluation of the model simulation, especially for the frequency of long dry spells, and this increases the systematic uncertainty of the model predictions. All three drought statistics show marked increases owing to the sensitivity of extreme statistics to changes in their distributions. The results should not be taken as firm predictions because extreme statistics for small regions cannot be calculated reliably from the output of the current generation of GCMs, but they point to the possibility of large increases in the severity of drought conditions as a consequence of climate change caused by increased CO{sub 2}. 46 refs., 16 figs., 4 tabs.

Gregory, J.M.; Mitchell, J.F.B.; Brady, A.J. [Hadley Centre for Climate Prediction and Research, Bracknell (United Kingdom)] [Hadley Centre for Climate Prediction and Research, Bracknell (United Kingdom)

1997-04-01T23:59:59.000Z

176

Teleseismic-Seismic Monitoring At Central Nevada Seismic Zone Region  

Open Energy Info (EERE)

Biasi, Et Al., 2008) Biasi, Et Al., 2008) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Teleseismic-Seismic Monitoring At Central Nevada Seismic Zone Region (Biasi, Et Al., 2008) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Teleseismic-Seismic Monitoring Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Glenn Biasi, Ileana Tibuleac, Leiph Preston (2008) Regional Resource Area Mapping In Nevada Using The Usarray Seismic Network Retrieved from "http://en.openei.org/w/index.php?title=Teleseismic-Seismic_Monitoring_At_Central_Nevada_Seismic_Zone_Region_(Biasi,_Et_Al.,_2008)&oldid=425638" Category: Exploration Activities What links here

177

Distributed Acoustic and Seismic Sensing  

Science Journals Connector (OSTI)

An overview of fiber optic distributed acoustic and seismic sensor system architectures is presented.

Kirkendall, Clay

178

Seismicity and Reservoir Fracture Characterization  

Broader source: Energy.gov [DOE]

Below are the project presentations and respective peer review results for Seismicity and Reservoir Fracture Characterization.

179

Fracture Properties From Seismic Scattering  

E-Print Network [OSTI]

Fractures scatter seismic energy and this energy can be analyzed to provide information about fracture

Burns, Daniel R.

2007-01-01T23:59:59.000Z

180

Chapter 7 - Horizontally Integrated Remote Measurements of Ocean Currents Using Acoustic Tomography Techniques  

Science Journals Connector (OSTI)

Abstract This chapter begins with a discussion of the comparative difficulty of measuring horizontally integrated subsurface oceanic current and vorticity measurements. This is followed by a discussion of computer-assisted tomography techniques used in the medical, geophysical, and seismic branches of science and their adaptation and extension to acoustic tomography for subsurface oceanographic investigations. In particular, the following aspects pertaining to the application of acoustic methods for probing the oceans’ interior water temperature and current structure, as well as their adaptations for measuring horizontally averaged water currents from straits, coastal water bodies, estuaries, and rivers, are addressed: (1) one-way tomography, (2) two-way tomography (reciprocal tomography), (3) acoustic tomographic measurements from straits, (4) coastal acoustic tomography (CAT), (5) river acoustic tomography (RAT), (6) acoustic tomographic measurements of vorticity, and (7) horizontally integrated current measurements using space-time acoustic scintillation analysis technique.

Antony Joseph

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Systematic study of low-lying E1 strength using the time-dependent mean field theory  

SciTech Connect (OSTI)

We carry out systematic investigation of electric dipole (E1) mode from light to heavy nuclei, using a new time-dependent mean field theory: the Canonical-basis Time-Dependent Hartree-Fock-Bogoliubov (Cb-TDHFB) theory. The Cb-TDHFB in the three-dimensional coordinate space representation can deal with pairing correlation and any kind of deformation in the timedependent framework. We report the neutron-number dependence of the low-energy E1 mode for light (A > 40) and heavy isotopes (A < 100) around N= 82.

Ebata, S.; Nakatsukasa, T.; Inakura, T. [Center for Nuclear Study, Univ. of Tokyo, Bunkyo-ku, 113-0033, Japan and Theoretical Nuclear Physics Laboratory, RIKEN Nishina Center, Wako-shi, 351-0198 (Japan); Theoretical Nuclear Physics Laboratory, RIKEN Nishina Center, Wako-shi, 351-0198 (Japan) and Center for Computational Sciences, Univ. of Tsukuba, Tsukuba-shi, 305-8571 (Japan); Theoretical Nuclear Physics Laboratory, RIKEN Nishina Center, Wako-shi, 351-0198 (Japan)

2012-11-12T23:59:59.000Z

182

ADVANCED WAVEFORM SIMULATION FOR SEISMIC MONITORING EVENTS  

SciTech Connect (OSTI)

High-Resolution Source Parameters using Calibration from Ambient Seismic Noise (ASN) Zhongwen Zhan, Shengji Wei, Sidao Ni, and Don V. Helmberger Abstract Several new methods have been developed to retrieve local Green's functions based on the cross-correlation of ambient seismic noise (station-to-station) and conventional (source-to-station) inversions. The latter methods provide the most broadband results but require accurate source parameters for phase-delay recovery which depends on the starting model. Considerable progress is being made in providing such information from 3D modeling, Tape et al. (2008), using Adjoint Tomography. But to match waveforms for the recent Chino Hills event still requires shifting synthetics to align on data. This means that it is difficult to use 3D simulations to refine source locations in near-real time. We can avoid the 3D problems by applying the CAP method and storing shifts from past events, Tan (2006), and/or using ASN, Shapiro et al. (2005), to predict lags for surface waves. Here, we directly compare results from CAP predictions with ASN results using stations near the Chino Hills event. We use the same SC seismic model as used in the Library of Earthquakes to generate Green's functions for noise (single force) for comparison with ASN correlations and allow Cap delays. We apply these delays or corrections to determine precise Centroid locations.

Helmberger, Donald V.; Tromp, Jeroen; Rodgers, Arthur J.

2009-04-30T23:59:59.000Z

183

Method of migrating seismic records  

DOE Patents [OSTI]

The present invention provides a method of migrating seismic records that retains the information in the seismic records and allows migration with significant reductions in computing cost. The present invention comprises phase encoding seismic records and combining the encoded seismic records before migration. Phase encoding can minimize the effect of unwanted cross terms while still allowing significant reductions in the cost to migrate a number of seismic records.

Ober, Curtis C. (Las Lunas, NM); Romero, Louis A. (Albuquerque, NM); Ghiglia, Dennis C. (Longmont, CO)

2000-01-01T23:59:59.000Z

184

Resonant seismic emission of subsurface objects  

E-Print Network [OSTI]

E . , and S. Keydar, 1998, Seismic monitoring of diffractionthe barrel. The Resonant Seismic Emission Source ReceiverFigure 1. Geometry o f the seismic experiment to locate a

Korneev, Valeri A.

2010-01-01T23:59:59.000Z

185

SEI0: CENS Seismic Research: Overview  

E-Print Network [OSTI]

catastrophe (from Berry 2002). Seismic waves show a smearedSeismology/index.html CENS Seismic Research: OverviewRecent developments in seismic source theory argue that

2005-01-01T23:59:59.000Z

186

Seismic demands in precast concrete diaphragms  

E-Print Network [OSTI]

and Mander, J. B. (2003). “Seismic Performance of PrecastState-of-the-Art Report on Seismic Resistance of Prestresseddevelopment of a diaphragm seismic design methodology,” PCI

Schoettler, Matthew John

2010-01-01T23:59:59.000Z

187

Testing time-dependent density functional theory with depopulated molecular orbitals for predicting electronic excitation energies of valence, Rydberg, and charge-transfer  

E-Print Network [OSTI]

Testing time-dependent density functional theory with depopulated molecular orbitals for predicting functionals for time-dependent density functional theory calculations of valence and Rydberg electronic functional that performs well for both ground-state properties and time-dependent density functional theory

Truhlar, Donald G

188

Time dependence of X-ray polarizability of a crystal induced by an intense femtosecond X-ray pulse  

Science Journals Connector (OSTI)

The time evolution of the electron density and the resulting time dependence of the X-ray polarizability of a crystal irradiated by highly intense XFEL femtosecond pulses is investigated theoretically. Rate equations for bound electrons and the Boltzmann equation for the unbound electron gas are used in calculations.

Leonov, A.

2014-10-23T23:59:59.000Z

189

Two-sided estimates on Dirichlet heat kernels for time-dependent parabolic operators with singular drifts  

E-Print Network [OSTI]

, -domain in Rd , where d 1 and (0, 1]. Our operator is L + µ · x, where L is a time-dependent uniformly Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology(2011-0009685) 2Panki Kim is supported by Basic Science Research Program through the National Re- search Foundation of Korea(NRF) grant

Kim, Panki

190

Integrated Ant Colony and Tabu Search approach for time dependent vehicle routing problems with simultaneous pickup and delivery  

Science Journals Connector (OSTI)

Today manufacturers have become much more concerned with the coordination of both manufacturing (of new products) and recycling (of reusable resources) operations. This requires simultaneous scheduling of both forward and reverse flows of goods over ... Keywords: Ant Colony System, Reverse logistics, Tabu Search algorithm, Time dependent vehicle routing problem, VRP with simultaneous pick-ups and deliveries (VRPSPD)

Tao Zhang; W. Art Chaovalitwongse; Yuejie Zhang

2014-07-01T23:59:59.000Z

191

A Generalized Adjoint Framework for Sensitivity and Global Error Estimation in Time-Dependent Nuclear Reactor Simulations 1  

E-Print Network [OSTI]

-Dependent Nuclear Reactor Simulations 1 H. F. Striplinga, , M. Anitescub , M. L. Adamsa aNuclear Engineering Bateman and transport equations, which govern the time-dependent neutronic behavior of a nuclear reactor framework for computing the adjoint variable to nuclear engineering problems gov- erned by a set

Anitescu, Mihai

192

Transport properties and Kondo correlations in nanostructures: Time-dependent DMRG method applied to quantum dots coupled to Wilson chains  

E-Print Network [OSTI]

elements to handle this problem: i a discretization procedure of the metallic band, leading to a mappingTransport properties and Kondo correlations in nanostructures: Time-dependent DMRG method applied,4 C. A. Büsser,5 G. B. Martins,5 E. V. Anda,6 and E. Dagotto1 1 Materials Science and Technology

Dias, Luis Gregório

193

A Self-assembly Model of Time-Dependent Glue Sudheer Sahu, Peng Yin, and John H. Reif  

E-Print Network [OSTI]

A Self-assembly Model of Time-Dependent Glue Strength Sudheer Sahu, Peng Yin, and John H. Reif Abstract Self-assembly is a ubiquitous process in which small objects self- organize into larger model for theoretical studies of self-assembly. We propose a refined self-assembly model in which

Reif, John H.

194

Effect of time-dependent piston velocity program on vortex ring formation in a piston/cylinder arrangement  

E-Print Network [OSTI]

Effect of time-dependent piston velocity program on vortex ring formation in a piston An analytical model describing laminar vortex ring formation in a nozzle flow generator piston/ cylinder.1063/1.2188918 I. INTRODUCTION Vortex rings are usually generated in the laboratory by the motion of a piston

Dabiri, John O.

195

Towards a 3D time dependent Fokker-Planck solver for modelling RF heating in realistic tokamak geometry  

E-Print Network [OSTI]

. Hedin, Ion Cyclotron Heating in Toroidal Plasmas, Ph.D. thesis, Royal Institute of Technology StockholmTowards a 3D time dependent Fokker-Planck solver for modelling RF heating in realistic tokamak supercomputers and the need for predictive tools to guide the experiments, modelling radio frequency heating

196

Time-dependent Integrated Modeling of Burning Plasmas TTF and US-Japan Workshop on Energetic Particle Physics  

E-Print Network [OSTI]

PRINCETON PLASMA PHYSICS LABORATORY PPPL 1 #12;Why traditional predictions of burning plasmas are inadequate PRINCETON PLASMA PHYSICS LABORATORY PPPL 2 #12;Why Time-Dependent Self-Consistent Integrated Modeling of plasma conditions and current drive PRINCETON PLASMA PHYSICS LABORATORY PPPL 3 #12;Goals of this Talk

Budny, Robert

197

MEMORY LOSS FOR TIME-DEPENDENT DYNAMICAL SYSTEMS WILLIAM OTT, MIKKO STENLUND, AND LAI-SANG YOUNG  

E-Print Network [OSTI]

MEMORY LOSS FOR TIME-DEPENDENT DYNAMICAL SYSTEMS WILLIAM OTT, MIKKO STENLUND, AND LAI-SANG YOUNG- namical systems. Exponential loss of memory is proved for expanding maps and for one-dimensional piece memory of the past as it evolves with time. Memory is lost when the initial state of a system is quickly

198

Chapter 7 - Prestack Seismic Inversion and Seismic Attribute Analysis  

Science Journals Connector (OSTI)

Abstract Based on seismic, logging, and geological data, the seismic inversion technique can reveal the spatial characteristics (including reservoir thickness, structural characteristics, extending direction, extending range, pinch-out location, and others) of the target layers, such as reservoirs or coal seams. By combining a large area of the continuous distribution of seismic data with high-resolution well logging data, this technique transforms conventional seismic data into a high-resolution well data volume, enabling us to use the acoustic characteristics of rock formations to ascertain lithological interfaces. So we can extrapolate the borehole lithological and physical properties and hydrocarbon features from points to lines and lines to faces, and predict lateral reservoir variations and reservoir properties from known reservoir characteristics. Seismic inversion technology has been one of the core technologies for reservoir characteristics and reservoir prediction. Seismic attribute analysis is the premise of fine reservoir characteristics and fine 3D seismic interpretation, which help us uncover information about lithology and reservoir heterogeneity from seismic data. The work of seismic attribute analysis includes (1) extracting various seismic attributes from poststack seismic data; (2) conducting crossplot analysis of seismic attributes and reservoir properties (including geology, well logging, and petrophysical parameters) to establish relationships between seismic attributes and reservoir parameters; and (3) dynamically interpreting 3D seismic, geological, and logging data, which helps us to study the relationships between seismic reflection characteristics and sedimentary and tectonic information, predict the reservoir spatial distribution, and reveal how fracture systems influence the reservoir distribution. Development of the seismic inversion technique in reservoir characterization can be summarized in four stages: the first stage was in the 1960s. In this stage, the exploration targets were structural reservoirs, and seismic inversion techniques were not used. The second stage was in the 1970s. The exploration targets were structural and lithological reservoirs, and no well-constraint seismic inversion techniques were used. The third stage was in the 1980s, when many new techniques were developed. Seismic inversion techniques, including the prestack amplitude versus offset (AVO) technique and wave impedance inversion technique, developed rapidly and greatly improved our understanding of seismic reservoir characterization. The fourth stage is the stage of reservoir characterization and dynamic monitoring in the 1990s. Seismic inversion techniques are used for reservoir dynamic characterization, such as 3D AVO inversion, well-seismic joint inversion, reservoir characteristics curve reconstruction, multiparameter reservoir inversion, and the elastic wave impedance inversion techniques. Prestack seismic data contain richer information than do poststack data, so prestack seismic inversion and attribute analysis are increasingly important in oil and gas exploration.

Ming Li; Yimin Zhao

2014-01-01T23:59:59.000Z

199

18 - Seismic Design  

Science Journals Connector (OSTI)

Abstract The damages and disruptions of the subsea pipelines caused by an earthquake may have severe effects on the service life, since it may lead to a significant financial loss due to service interruptions, fires, explosions, and environmental contamination. In general, the seismic analyses of the permanent ground deformation for buried and unburied pipes, and seismic ground waves for unburied pipes are required for designing pipeline systems. Many subsea pipelines are often buried for stability and mechanical protection in the shallow water area; otherwise, they are laid on the seabed. This chapter addresses available seismic design codes, standards and design criteria for subsea pipelines, a general design and analysis methodology for fault crossing and seismic ground wave, design and analysis examples using a static model for buried pipe subjected to permanent ground deformations due to the foundation failure, a time history dynamic model for unburied pipelines subjected to seismic ground waves, the mitigation methods for subsea pipelines to avoid seismic hazards including modifying loading and boundary conditions, modifying pipeline configuration, modifying pipeline route selection, and improving emergency response.

Qiang Bai; Yong Bai

2014-01-01T23:59:59.000Z

200

Chapter 5 - Seismic Attribute Analysis  

Science Journals Connector (OSTI)

Abstract Seismic attributes are the geometry, kinematics, dynamics, and statistical characteristics of seismic waves, which are extracted or derived from prestack and poststack seismic data by mathematical transformation. For a long time, seismic data only have been used to track lineups of seismic waves in order to delineate the geometry and structural characteristics of oil and gas reservoirs. In fact, there is rich information about lithology, physical properties, and fluid composition hidden in seismic data. As we all know, the characteristics of the seismic signal are caused by petrophysical characteristics and its variability. Geoscientists need to do seismic attribute analyses and calibration in order to eliminate data distortion and dig out lithological and physical properties hidden in seismic data. Especially when people are eager to cognize the heterogeneity of lithological and stratigraphic reservoirs, the rich information about the spatial variability in seismic data seems more precious. In recent years, with the advancement of reservoir interpretation and the needs of three dimensional (3-D) seismic data analysis, scientists have found out more and more new attributes on the basis of conventional seismic attributes. At the same time, methods and means used for the calculation and analysis of seismic attributes are increasing. Seismic attribute analysis has been successfully applied in reservoir lithological prediction, hydrocarbon potential prediction, and reservoir property estimates.

Ming Li; Yimin Zhao

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Seismic Fracture Characterization Methods for Enhanced Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

Seismic Fracture Characterization Methods for Enhanced Geothermal Systems; 2010 Geothermal Technology Program Peer Review Report Seismic Fracture Characterization Methods for...

202

Three-dimensional optical tomography with the equation of radiative transfer  

E-Print Network [OSTI]

on a transport-backtransport method applied to the two-dimensional time-dependent equation of radiative transferThree-dimensional optical tomography with the equation of radiative transfer Gassan S. Abdoulaev reconstruction scheme that is based on the time-independent equation of radiative transfer (ERT) and allows

Hielscher, Andreas

203

Finite-frequency sensitivity kernels for global seismic wave propagation based upon adjoint methods  

Science Journals Connector (OSTI)

......wave. P-wave energy enters the shadow...generally has a lower frequency content compared...simulate the seismic response of 2D and 3D geological...2006. Finite-frequency Kernels based upon...2004. Finite-frequency tomography reveals...Circumventing storage limitations in variational......

Qinya Liu; Jeroen Tromp

2008-07-01T23:59:59.000Z

204

Isovector Giant Dipole Resonance from the 3D Time-Dependent Density Functional Theory for Superfluid Nuclei  

SciTech Connect (OSTI)

A fully symmetry unrestricted Time-Dependent Density Functional Theory extended to include pairing correlations is used to calculate properties of the isovector giant dipole resonances of the deformed open-shell nuclei 172Yb, 188Os, and 238U, and to demonstrate good agreement with experimental data on nuclear photo-absorption cross-sections for two different Skyrme force parameterizations of the energy density functional: SkP and SLy4.

Stetcu, Ionel; Bulgac, Aurel; Magierski, Piotr; Roche, Kenneth J.

2011-11-21T23:59:59.000Z

205

In-situ gamma spectrometry measurements of time-dependent Xenon-135 inventory in the TRIGA Mark II reactor Vienna  

E-Print Network [OSTI]

In this work, it has been shown that the time dependent Xe-135 inventory in the TRIGA Mark II reactor in Vienna, Austria can be measured via gamma spectrometry even in the presence of strong background radiation. It is focussing on the measurement of (but not limited to) the nuclide Xe-135. The time dependent Xe-135 inventory of the TRIGA Mark II reactor Vienna has been measured using a temporary beam line between one fuel element of the core placed onto the thermal column after shutdown and a detector system located just above the water surface of the reactor tank. For the duration of one week, multiple gamma ray spectra were recorded automatically, starting each afternoon after reactor shutdown until the next morning. One measurement series has been recorded over the weekend. The Xe-135 peaks were extracted from a total of 1227 recorded spectra using an automated peak search algorithm and analyzed for their time-dependent properties. Although the background gamma radiation present in the core after shutdown...

Riede, Julia

2013-01-01T23:59:59.000Z

206

In-situ gamma spectrometry measurements of time-dependent Xenon-135 inventory in the TRIGA Mark II reactor Vienna  

E-Print Network [OSTI]

In this work, it has been shown that the time dependent Xe-135 inventory in the TRIGA Mark II reactor in Vienna, Austria can be measured via gamma spectrometry even in the presence of strong background radiation. It is focussing on the measurement of (but not limited to) the nuclide Xe-135. The time dependent Xe-135 inventory of the TRIGA Mark II reactor Vienna has been measured using a temporary beam line between one fuel element of the core placed onto the thermal column after shutdown and a detector system located just above the water surface of the reactor tank. For the duration of one week, multiple gamma ray spectra were recorded automatically, starting each afternoon after reactor shutdown until the next morning. One measurement series has been recorded over the weekend. The Xe-135 peaks were extracted from a total of 1227 recorded spectra using an automated peak search algorithm and analyzed for their time-dependent properties. Although the background gamma radiation present in the core after shutdown was large especially in the lower energy range, the Xe-135 peak located at 249.8 keV could be extracted from the most spectra where present and could be compared to theoretical calculations.

Julia Riede; Helmuth Boeck

2013-07-29T23:59:59.000Z

207

Controllable seismic source  

DOE Patents [OSTI]

An apparatus for generating seismic waves includes a housing, a strike surface within the housing, and a hammer movably disposed within the housing. An actuator induces a striking motion in the hammer such that the hammer impacts the strike surface as part of the striking motion. The actuator is selectively adjustable to change characteristics of the striking motion and characteristics of seismic waves generated by the impact. The hammer may be modified to change the physical characteristics of the hammer, thereby changing characteristics of seismic waves generated by the hammer. The hammer may be disposed within a removable shock cavity, and the apparatus may include two hammers and two shock cavities positioned symmetrically about a center of the apparatus.

Gomez, Antonio; DeRego, Paul Jeffrey; Ferrel, Patrick Andrew; Thom, Robert Anthony; Trujillo, Joshua J.; Herridge, Brian

2014-08-19T23:59:59.000Z

208

Seismic viscoelastic attenuation Submitted to  

E-Print Network [OSTI]

Seismic viscoelastic attenuation Submitted to: Encyclopedia of Solid Earth Geophysics Harsh Gupta-3046 USA E-mail: vernon.cormier@uconn.edu Tel: 860-486-3547 Fax: 860-486-3346 #12;SEISMIC VISCOELASTIC ATTENUATION Synonyms Seismic intrinsic attenuation Definitions Linear viscoelastic attenuation. The loss

Cormier, Vernon F.

209

Borehole seismic monitoring of seismic stimulation at Occidental Permian Ltd's -- South Wason Clear Fork Unit  

E-Print Network [OSTI]

the distribution of seismic energy within the reservoir.Field Monitoring of ASR Seismic Stimulation Source at LostField Results from Seismic Stimulation, 17th International

Daley, Tom; Majer, Ernie

2007-01-01T23:59:59.000Z

210

Subduction Zone Seismic Experiment in Peru: Results From a Wireless Seismic Network  

E-Print Network [OSTI]

Sensing Subduction Zone Seismic Experiment in Peru:results from a wireless seismic Network Igor Stubailo,deployed in Peru. UCLA seismic line in Peru Lake Titicaca

2009-01-01T23:59:59.000Z

211

Seismic tomography of the Tongariro Volcanic Centre, New Zealand  

Science Journals Connector (OSTI)

......the east due to the prevailing westerly wind direction. This probably occurs in conjunction...Maori iwi, Rangipo Prison and several farm owners. This paper benefitted from helpful...in north Chile: a combined onshore and offshore study, J. geophys. Res.,105,28......

D. P. Rowlands; R. S. White; A. J. Haines

2005-12-01T23:59:59.000Z

212

Crosswell seismic study in a seismically poor data area  

SciTech Connect (OSTI)

Crosswell traveltime tomography and reflection imaging assisted a reservoir characterization effort in an area of poor-quality surface seismic data. Both the tomogram and the reflection image proved useful in the description of the fractured reservoir interval. The velocity tomogram shows that: (1) the vertical resolution was sufficient to identify and characterize a 50-ft (15 m) thick lithological unit of brittle rocks, which was the most important interval for the characterization of this fractured reservoir; (2) different lithological units present sufficient velocity contrast to be identifiable on the tomogram; and (3) the tomogram velocity is higher than the sonic velocity implying that the rocks in the interwell area may be anisotropic. Correlation of the lithologies with the tomogram implies that the major controlling factor of the anisotropy is the shale content in the formation. The crosswell reflection image, generated by a VSP-CDP mapping technique defines the fractured reservoir interval in terms of high-frequency reflections. The lateral resolution of this reflection image is difficult to define because the survey coverage is nonuniform as a result of the receiver spacing being much larger than the source spacing. The dips of the reflections do not quite agree with the dips that are inferred from well log ties. The authors believe this disagreement is a result of the anisotropy of the medium and the use of an isotropic imaging algorithm. Improved data acquisition (finer spatial sampling) that would allow better wavefield separation techniques to be used would probably have produced higher quality crosswell reflection images.

Lee, D.S.; Walden, A.F. [Unocal Corp., Brea, CA (United States)] [Unocal Corp., Brea, CA (United States); Lazaratos, S.K. [Tomoseis Inc., Houston, TX (United States)] [Tomoseis Inc., Houston, TX (United States)

1995-05-01T23:59:59.000Z

213

Turbocharging Quantum Tomography.  

SciTech Connect (OSTI)

Quantum tomography is used to characterize quantum operations implemented in quantum information processing (QIP) hardware. Traditionally, state tomography has been used to characterize the quantum state prepared in an initialization procedure, while quantum process tomography is used to characterize dynamical operations on a QIP system. As such, tomography is critical to the development of QIP hardware (since it is necessary both for debugging and validating as-built devices, and its results are used to influence the next generation of devices). But tomography su %7C ers from several critical drawbacks. In this report, we present new research that resolves several of these flaws. We describe a new form of tomography called gate set tomography (GST), which unifies state and process tomography, avoids prior methods critical reliance on precalibrated operations that are not generally available, and can achieve unprecedented accuracies. We report on theory and experimental development of adaptive tomography protocols that achieve far higher fidelity in state reconstruction than non-adaptive methods. Finally, we present a new theoretical and experimental analysis of process tomography on multispin systems, and demonstrate how to more e %7C ectively detect and characterize quantum noise using carefully tailored ensembles of input states.

Blume-Kohout, Robin J; Gamble, John King,; Nielsen, Erik; Maunz, Peter Lukas Wilhelm; Scholten, Travis L.; Rudinger, Kenneth Michael

2015-01-01T23:59:59.000Z

214

Modifying the variational principle in the action integral functional derivation of time-dependent density functional theory  

E-Print Network [OSTI]

According to a recent paper by G. Vignale [Phys. Rev. A 77, 062511 (2008), arXiv:0803.2727], the problems arising in the original derivation of time-dependent density functional theory (TDDFT) based on the Runge-Gross (RG) action-integral functional (AIF) are due to an incorrect variational principle (VP). This argument and the proposed modification of the VP are critically analyzed. The more fundamental problem, though, is the indefiniteness of the RG AIF. In contrast to a widely held belief, that indefiniteness is not eliminated in the variational procedure, which unwittingly is corroborated by Vignale's initial point.

J. Schirmer

2010-10-20T23:59:59.000Z

215

Core and Valence Excitations in Resonant X-ray Spectroscopy using Restricted Excitation Window Time-dependent Density Functional Theory  

SciTech Connect (OSTI)

We report simulations of X-ray absorption near edge structure (XANES), resonant inelastic X-ray scattering (RIXS) and 1D stimulated X-ray Raman spectroscopy (SXRS) signals of cysteine at the oxygen, nitrogen and sulfur K and L2,3 edges. The simulated XANES signals from the restricted window time-dependent density functional theory (REW-TDDFT) and the static exchange (STEX) method are compared with experiments, showing that REW-TDDFT is more accurate and computationally less expensive than STEX. Simulated RIXS and 1D SXRS signals from REW-TDDFT give some insights on the correlation of different excitations in the molecule.

Zhang, Yu; Biggs, Jason D.; Healion, Daniel; Govind, Niranjan; Mukamel, Shaul

2012-11-21T23:59:59.000Z

216

Time-Depending Parametric Variational Approach for an Economic General Equilibrium Problem of Pure Exchange with Application  

SciTech Connect (OSTI)

This paper considers a qualitative analysis of the solution of a pure exchange general economic equilibrium problem according to two independent parameters. Some recently results obtained by the author in the static and the dynamic case have been collected. Such results have been applied in a particular parametric case: it has been focused the attention on a numerical application for which the existence of the solution of time-depending parametric variational inequality that describes the equilibrium conditions has been proved by means of the direct method. By using MatLab computation after a linear interpolation, the curves of equilibrium have been visualized.

Scaramuzzino, F. [Department of Mathematics, University of Messina (Italy)

2009-09-09T23:59:59.000Z

217

Real-time linear response for time-dependent density-functional theory Department of Physical Chemistry and the Lise Meitner Minerva-Center for Quantum Chemistry,  

E-Print Network [OSTI]

Real-time linear response for time-dependent density-functional theory Roi Baer Department a linear-response approach for time-dependent density-functional theories using time-adiabatic functionals ground state. This ground state can be treated using density-functional theory, where the density n0(r) 2

Baer, Roi

218

A long-range-corrected density functional that performs well for both ground-state properties and time-dependent density functional theory  

E-Print Network [OSTI]

and time-dependent density functional theory excitation energies, including charge-transfer excited states energies within time-dependent density functional theory, is systematically evaluated, and optimal values. THEORETICAL BACKGROUND Generalized gradient approximations GGAs in density functional theory DFT are quite

Herbert, John

219

Chapter 6 - Seismic Inversion Techniques  

Science Journals Connector (OSTI)

Abstract Seismic inversion techniques were developed as a discipline at the same time that seismic technologies were widely applied in oil exploration and development starting in the 1980s. Except for basic theories and principles, seismic inversion techniques are different from traditional seismic exploration methods in geological tasks, involving basic information as well as study approaches. In the early stages of exploration, the geological task of seismic exploration was to find structures and identify traps, and seismic exploration techniques always focused on the ups and downs of reflection interfaces. They mainly relied on the travel time for structural interpretation. The main work of reservoir geophysics is to study the heterogeneity of a reservoir, and the main geological task is to make predictions on the reservoir parameters. Scientists focus on the lateral variation of reservoir characteristics and conduct seismic interpretation based on the information extracted from the results of reservoir seismic inversion. Seismic inversion has developed rapidly in recent years, including recursive inversion, log-constrained inversion, and multiparameter lithological seismic inversion. We choose different methods according to the geological characteristics and specific problems of the study area.

Ming Li; Yimin Zhao

2014-01-01T23:59:59.000Z

220

Modulated Luminescent Tomography  

E-Print Network [OSTI]

Two such techniques, X-ray luminescence computed tomography (XLCT), [9] and X-ray micro- ..... Optical-Thermal Response of Laser-Irradiated Tissue.

2014-09-10T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Measurement of the Time-Dependent CP Asymmetry of Partially Reconstructed B0 to D*+D*- Decays  

SciTech Connect (OSTI)

We present a new measurement of the time-dependent CP asymmetry of B{sup 0} {yields}D*{sup +}D*{sup -} decays using (471 {+-} 5) million B{bar B} pairs collected with the BABAR detector at the PEP-II B Factory at the SLAC National Accelerator Laboratory. Using the technique of partial reconstruction, we measure the time-dependent CP asymmetry parameters S = -0.34 {+-} 0.12 {+-} 0.05 and C = +0:15 {+-} 0.09 {+-} 0.04. Using the value for the CP-odd fraction R{perpendicular} = 0.158 {+-} 0.028 {+-} 0.006, previously measured by BABAR with fully reconstructed B{sup 0} {yields} D{sup *+}D{sup *-} events, we extract the CP-even components S{sub +} = -0.49 {+-} 0.18 {+-} 0.07 {+-} 0.04 and C{sub +} = +0.15 {+-} 0.09 {+-} 0.04. In each case, the first uncertainty is statistical and the second is systematic; the third uncertainty on S{sub +} is the contribution from the uncertainty on R{perpendicular}. The measured value of the CP-even component S{sub +} is consistent with the value of sin 2{beta} measured in b {yields} (c{bar c})s transitions, and with the Standard Model expectation of small penguin contributions.

Lees, J. P.

2012-08-13T23:59:59.000Z

222

Generation of matter-wave solitons of the Gross-Pitaevskii equation with a time-dependent complicated potential  

Science Journals Connector (OSTI)

We examine the generation of bright matter-wave solitons in the Gross-Pitaevskii equation describing Bose-Einstein condensates with a time-dependent complex potential, which is composed of a repulsive parabolic background potential and a gravitational field. By performing a modified lens-type transformation, an explicit expression for the growth rate of a purely growing modulational instability is presented and analyzed. We point out the effects of the gravitational field, as well as of the parameter related to the feeding or loss of atoms in the condensate, on the instability growth rate. It is evident from numerical simulations that the feeding with atoms and the magnetic trap have opposite effects on the dynamics of the system. It is shown that the feeding or loss parameter can be well used to control the instability domain. Our study shows that the gravitational field changes the condensate trail of the soliton trains during the propagation. We also perform a numerical analysis to solve the Gross-Pitaevskii equation with a time-dependent complicated potential. The numerical results on the effect of both the gravitational field and the parameter of feeding or loss of atoms in the condensate agree well with predictions of the linear stability analysis. Another result of the present work is the modification of the background wave function in the Thomas-Fermi approximation during the numerical simulations.

Alidou Mohamadou; Etienne Wamba; Serge Y. Doka; Thierry B. Ekogo; Timoleon C. Kofane

2011-08-01T23:59:59.000Z

223

Measurement of CP Content and Time-Dependent CP Violation in B0 --> D*+D*- Decays  

SciTech Connect (OSTI)

This dissertation presents the measurement of the Cp-odd fraction and time-dependent CP violation parameters for the B{sup 0} {yields} D*{sup +} D*{sup -} decay. These results are based on the full BABAR dataset of (467 {+-} 5) x 10{sup 6} B{bar B} pairs collected at the PEP-II B Factory at the Stanford Linear Accelerator Center. An angular analysis finds that the CP-odd fraction of the B{sup 0} {yields} D*{sup +} D*{sup -} decay is R{sub {perpendicular}} = 0.158 {+-} 0.028 {+-} 0.006, where the first uncertainty is statistical, and the second is systematic. A fit to the flavor-tagged, time-dependent, angular decay rate yields C{sub +} = 0.02 {+-} 0.12 {+-} 0.02; C{sub {perpendicular}} = 0.41 {+-} 0.50 {+-} 0.08; S{sub +} = -0.76 {+-} 0.16 {+-} 0.04; S{sub {perpendicular}} = -1.81 {+-} 0.71 {+-} 0.16, for the CP-odd ({perpendicular}) and CP-even (+) contributions. Constraining these two contributions to be the same results in C = 0.047 {+-} 0.091 {+-} 0.019; S = -0.71 {+-} 0.16 {+-} 0.03. These measurements are consistent with the Standard Model and with measurements of sin2{beta} from B{sup 0} {yields} (c{bar c})K{sup 0} decays.

Anderson, Jacob M.; /SLAC; ,

2009-01-05T23:59:59.000Z

224

Seismic Design Expectations Report  

Broader source: Energy.gov (indexed) [DOE]

Seismic Design Expectations Report Seismic Design Expectations Report March 2010 CD- This Rev of th Se -0 view Module w he overall Cons OFFICE O eismic De C CD-1 was used to dev struction Projec inco OF ENVIRO Standard esign Exp Critical Deci CD-2 M velop the Revie ct Review cond orporated in the ONMENTA Review Pla pectation ision (CD) A C March 2010 ew Plan for the ducted in 2009 e current versio AL MANAG an (SRP) ns Report Applicability D-3 e Oak Ridge Bl 9. Lessons lear on of the Modu GEMENT t (SDER) CD-4 ldg. 3019 60% rned from this r ule. ) Post Ope design review review have be eration w as part een Standard Review Plan, 2 nd Edition, March 2010 i FOREWORD The Standard Review Plan (SRP) 1 provides a consistent, predictable corporate review framework to ensure that issues and risks that could challenge the success of Office of Environmental

225

Seismic stimulation for enhanced oil recovery  

E-Print Network [OSTI]

M. , and Z. Wang, 1992, Seismic properties of pore ?uids:2005, Relationships between seismic and hydrological proper-by d/dt ? ? / ? t ? u · ?. Seismic stimulation Biot, M. A. ,

Pride, S.R.

2008-01-01T23:59:59.000Z

226

Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

Seismic Techniques Seismic Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Seismic Techniques Details Activities (0) Areas (0) Regions (0) NEPA(10) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Seismic Techniques Parent Exploration Technique: Geophysical Techniques Information Provided by Technique Lithology: Rock unit density influences elastic wave velocities. Stratigraphic/Structural: Structural geology- faults, folds, grabens, horst blocks, sedimentary layering, discontinuities, etc. Hydrological: Combining compressional and shear wave results can indicate the presence of fluid saturation in the formation. Thermal: High temperatures and pressure impact the compressional and shear wave velocities.

227

Modeling Three-Dimensional Upper Mantle Seismic Anisotropy with Higher Mode Surface Waves  

E-Print Network [OSTI]

Seismic Anisotropy . . . . . . . . . . . . . . . . . . . .Seismic Wave Propagation in a Weakly Anisotropicof seismic anisotropy . . . . . . . . . . . . . . . .

Yuan, Kaiqing

2014-01-01T23:59:59.000Z

228

Near and Above Ionization Electronic Excitations with Non-Hermitian Real-Time Time-Dependent Density Functional Theory  

SciTech Connect (OSTI)

We present a real-time time-dependent density functional theory (RT-TDDFT) prescription for capturing near and post-ionization excitations based on non-Hermitian von Neumann density matrix propagation with atom-centered basis sets, tuned range-separated DFT, and a phenomenological imaginary molecular orbital-based absorbing potential to mimic coupling to the continuum. The computed extreme ultraviolet absorption spectra for acetylene (C2H2), water (H2O), and Freon 12 (CF2Cl2) agree well with electron energy loss spectroscopy (EELS) data over the range 0 to 50 eV. The absorbing potential removes spurious high energy finite basis artifacts, yielding correct bound to bound transitions, metastable (autoionizing) resonance states, and consistent overall absorption shapes.

Lopata, Kenneth A.; Govind, Niranjan

2013-11-12T23:59:59.000Z

229

UV-vis spectra of singlet state cationic polycyclic aromatic hydrocarbons: Time-dependent density functional theory study  

SciTech Connect (OSTI)

A theoretical study of singlet state cations of polycyclic aromatic hydrocarbons is performed. Appropriate symmetry suitable for further calculations is chosen for each of the systems studied. The excitation states of such species are obtained by the time dependent density functional theory (TD-DFT) method. The computations are performed using both Pople and electronic response properties basis sets. The results obtained with the use of different basis sets are compared. The electronic transitions are described and the relationships for the lowest-lying transitions states of different species are found. The properties of in-plane and out-of-plane transitions are also delineated. The TD-DFT results are compared with the experimental data available.

Dominikowska, Justyna, E-mail: justyna@uni.lodz.pl; Domagala, Malgorzata; Palusiak, Marcin [Department of Theoretical and Structural Chemistry, University of ?ód?, Pomorska 163/165, 90-236 ?ód? (Poland)] [Department of Theoretical and Structural Chemistry, University of ?ód?, Pomorska 163/165, 90-236 ?ód? (Poland)

2014-01-28T23:59:59.000Z

230

Scaled Brownian motion: a paradoxical process with a time dependent diffusivity for the description of anomalous diffusion  

E-Print Network [OSTI]

Anomalous diffusion is frequently described by scaled Brownian motion (SBM), a Gaussian process with a power-law time dependent diffusion coefficient. Its mean squared displacement is $\\langle x^2(t)\\rangle\\simeq\\mathscr{K}(t)t$ with $\\mathscr{K}(t)\\simeq t^{\\alpha-1}$ for $0does not exhibit a significant amplitude scatter of the time averaged mean squared displacement. More severely, we demonstrate that under confinement, the dynamics encoded by SBM is fundamentally different from both fractional Brownian motion and continuous time random walks. SBM is highly non-stationary and cannot provide a physical description for particles in a thermalised stationary system. Our findings have direct impact on the modelling of single particle tracking experiments, in particu...

Jeon, J -H; Metzler, R

2014-01-01T23:59:59.000Z

231

Time-dependent calculations of transfer ionization by fast proton-helium collision in one-dimensional kinematics  

E-Print Network [OSTI]

We analyze a transfer ionization (TI) reaction in the fast proton-helium collision $\\rm H^+ + He \\to H^0 + He^{2+} + e^-$ by solving a time-dependent Schr\\"odinger equation (TDSE) under the classical projectile motion approximation in one-dimensional kinematics. In addition, we construct various time independent analogues of our model using lowest order perturbation theory in the form of the Born series. By comparing various aspects of the TDSE and the Born series calculations, we conclude that the recent discrepancies of experimental and theoretical data may be attributed to deficiency of the Born models used by other authors. We demonstrate that the correct Born series for TI should include the momentum space overlap between the double ionization amplitude and the wave function of the transferred electron.

Serov, Vladislav V

2014-01-01T23:59:59.000Z

232

The pulsar force-free magnetosphere linked to its striped wind: time-dependent pseudo-spectral simulations  

E-Print Network [OSTI]

(abridged) Pulsar activity and its related radiation mechanism are usually explained by invoking some plasma processes occurring inside the magnetosphere. Despite many detailed local investigations, the global electrodynamics around those neutron stars remains poorly described. Better understanding of these compact objects requires a deep and accurate knowledge of their immediate electromagnetic surrounding within the magnetosphere and its link to the relativistic pulsar wind. The aim of this work is to present accurate solutions to the nearly stationary force-free pulsar magnetosphere and its link to the striped wind, for various spin periods and arbitrary inclination. To this end, the time-dependent Maxwell equations are solved in spherical geometry in the force-free approximation using a vector spherical harmonic expansion of the electromagnetic field. An exact analytical enforcement of the divergenceless of the magnetic part is obtained by a projection method. Special care has been given to design an algo...

Pétri, J

2012-01-01T23:59:59.000Z

233

Interaction between O{sub 2} and ZnO films probed by time-dependent second-harmonic generation  

SciTech Connect (OSTI)

The interaction between O{sub 2} and ZnO thin films prepared by atomic layer deposition has been investigated by time-dependent second-harmonic generation, by probing the electric field induced by adsorbed oxygen molecules on the surface. The second-harmonic generated signal decays upon laser exposure due to two-photon assisted desorption of O{sub 2}. Blocking and unblocking the laser beam for different time intervals reveals the adsorption rate of O{sub 2} onto ZnO. The results demonstrate that electric field induced second-harmonic generation provides a versatile non-contact probe of the adsorption kinetics of molecules on ZnO thin films.

Andersen, S. V., E-mail: sva@nano.aau.dk [Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands); Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4A, DK-9220 Aalborg Øst (Denmark); Vandalon, V.; Bosch, R. H. E. C.; Loo, B. W. H. van de; Kessels, W. M. M., E-mail: w.m.m.kessels@tue.nl [Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands); Pedersen, K. [Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4A, DK-9220 Aalborg Øst (Denmark)

2014-02-03T23:59:59.000Z

234

Velocity model-building by 3D frequency-domain, full-waveform inversion of wide-aperture seismic data  

E-Print Network [OSTI]

Velocity model-building by 3D frequency-domain, full-waveform inversion of wide-aperture seismic, any approach that helps to auto- mate and optimize velocity model-building will speed up the output . The most common approaches for building a PSDM velocity model rely on reflection traveltime tomography e

Vallée, Martin

235

Induced Seismicity Impact | Open Energy Information  

Open Energy Info (EERE)

Induced Seismicity Impact Jump to: navigation, search Retrieved from "http:en.openei.orgwindex.php?titleInducedSeismicityImpact&oldid612409" Category: NEPA Resources...

236

Seismic Fracture Characterization Methods for Enhanced Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

Seismic Fracture Characterization Methods for Enhanced Geothermal Systems Principal Investigator: John H. Queen Hi-Q Geophysical Inc. Track Name: Seismicity and Reservoir Fracture...

237

Induced Seismicity | Open Energy Information  

Open Energy Info (EERE)

Induced Seismicity Induced Seismicity Jump to: navigation, search Contents 1 Geothermal Lab Call Projects for Induced Seismicity 2 Geothermal ARRA Funded Projects for Induced Seismicity Geothermal Lab Call Projects for Induced Seismicity Loading map... {"format":"googlemaps3","type":"ROADMAP","types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":200,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"\u2026 further results","default":"","geoservice":"google","zoom":14,"width":"600px","height":"350px","centre":false,"layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","icon":"","visitedicon":"","forceshow":true,"showtitle":true,"hidenamespace":false,"template":false,"title":"","label":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"locations":[{"text":"

238

Teleseismic-Seismic Monitoring At Central Nevada Seismic Zone...  

Open Energy Info (EERE)

Unknown References Glenn Biasi, Leiph Preston, Ileana Tibuleac (2009) Body Wave Tomography For Regional Scale Assessment Of Geothermal Indicators In The Western Great Basin...

239

Seismic event classification system  

DOE Patents [OSTI]

In the computer interpretation of seismic data, the critical first step is to identify the general class of an unknown event. For example, the classification might be: teleseismic, regional, local, vehicular, or noise. Self-organizing neural networks (SONNs) can be used for classifying such events. Both Kohonen and Adaptive Resonance Theory (ART) SONNs are useful for this purpose. Given the detection of a seismic event and the corresponding signal, computation is made of: the time-frequency distribution, its binary representation, and finally a shift-invariant representation, which is the magnitude of the two-dimensional Fourier transform (2-D FFT) of the binary time-frequency distribution. This pre-processed input is fed into the SONNs. These neural networks are able to group events that look similar. The ART SONN has an advantage in classifying the event because the types of cluster groups do not need to be pre-defined. The results from the SONNs together with an expert seismologist's classification are then used to derive event classification probabilities.

Dowla, Farid U. (Castro Valley, CA); Jarpe, Stephen P. (Brentwood, CA); Maurer, William (Livermore, CA)

1994-01-01T23:59:59.000Z

240

The next generation of shared seismic models for R&D.  

SciTech Connect (OSTI)

We have created several elastic 2-D models and are currently defining a complex 3D elastic salt model for distribution to the international research community for use in the calibration of AVO, polarization filtering, tomography, multicomponent seismic analysis, converted wave tomography, and seismic attribute analysis. We have also obtained the release of several real 2-D data sets corresponding to the 2-D models to test the robustness of any new techniques. In addition to the synthetic seismograms generated over these models, we will release the model definition of layers and rock properties to the research community so that others may modify them to include features beyond the scope of our current effort, such as gas clouds, fractures, and diagenetic changes. Finally, we expect these models to serve as a test bed for impmving the computational efficiency of elastic mode ling as a goal in itself.

Marfurt, K. J.; Wiley, R. (Robert); Martin, G. S. (Gary S.); House, L. S. (Leigh S.); Larsen, S. C. (Shawn C.)

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Tomography and reliable information  

Science Journals Connector (OSTI)

Principles of tomography are developed and applied to the problem of two-view interferometry on a tokamak plasma. It is shown that M equispaced views, or projections, of a...

Howard, John

1988-01-01T23:59:59.000Z

242

Automating Shallow Seismic Imaging  

SciTech Connect (OSTI)

This seven-year, shallow-seismic reflection research project had the aim of improving geophysical imaging of possible contaminant flow paths. Thousands of chemically contaminated sites exist in the United States, including at least 3,700 at Department of Energy (DOE) facilities. Imaging technologies such as shallow seismic reflection (SSR) and ground-penetrating radar (GPR) sometimes are capable of identifying geologic conditions that might indicate preferential contaminant-flow paths. Historically, SSR has been used very little at depths shallower than 30 m, and even more rarely at depths of 10 m or less. Conversely, GPR is rarely useful at depths greater than 10 m, especially in areas where clay or other electrically conductive materials are present near the surface. Efforts to image the cone of depression around a pumping well using seismic methods were only partially successful (for complete references of all research results, see the full Final Technical Report, DOE/ER/14826-F), but peripheral results included development of SSR methods for depths shallower than one meter, a depth range that had not been achieved before. Imaging at such shallow depths, however, requires geophone intervals of the order of 10 cm or less, which makes such surveys very expensive in terms of human time and effort. We also showed that SSR and GPR could be used in a complementary fashion to image the same volume of earth at very shallow depths. The primary research focus of the second three-year period of funding was to develop and demonstrate an automated method of conducting two-dimensional (2D) shallow-seismic surveys with the goal of saving time, effort, and money. Tests involving the second generation of the hydraulic geophone-planting device dubbed the ''Autojuggie'' showed that large numbers of geophones can be placed quickly and automatically and can acquire high-quality data, although not under rough topographic conditions. In some easy-access environments, this device could make SSR surveying considerably more efficient and less expensive, particularly when geophone intervals of 25 cm or less are required. The most recent research analyzed the difference in seismic response of the geophones with variable geophone spike length and geophones attached to various steel media. Experiments investigated the azimuthal dependence of the quality of data relative to the orientation of the rigidly attached geophones. Other experiments designed to test the hypothesis that the data are being amplified in much the same way that an organ pipe amplifies sound have so far proved inconclusive. Taken together, the positive results show that SSR imaging within a few meters of the earth's surface is possible if the geology is suitable, that SSR imaging can complement GPR imaging, and that SSR imaging could be made significantly more cost effective, at least in areas where the topography and the geology are favorable. Increased knowledge of the Earth's shallow subsurface through non-intrusive techniques is of potential benefit to management of DOE facilities. Among the most significant problems facing hydrologists today is the delineation of preferential permeability paths in sufficient detail to make a quantitative analysis possible. Aquifer systems dominated by fracture flow have a reputation of being particularly difficult to characterize and model. At chemically contaminated sites, including U.S. Department of Energy (DOE) facilities and others at Department of Defense (DOD) installations worldwide, establishing the spatial extent of the contamination, along with the fate of the contaminants and their transport-flow directions, is essential to the development of effective cleanup strategies. Detailed characterization of the shallow subsurface is important not only in environmental, groundwater, and geotechnical engineering applications, but also in neotectonics, mining geology, and the analysis of petroleum reservoir analogs. Near-surface seismology is in the vanguard of non-intrusive approaches to increase knowledge of the shallow subsurface; our

Steeples, Don W.

2004-12-09T23:59:59.000Z

243

SEISMIC INTERFEROMETRY FOR TEMPORAL MONITORING Norimitsu Nakata  

E-Print Network [OSTI]

SEISMIC INTERFEROMETRY FOR TEMPORAL MONITORING by Norimitsu Nakata #12;c Copyright by Norimitsu Seismic interferometry, where one computes coherency of waves between two or more receivers and averages from the first study related to seismic interferometry (although the name of seismic interferometry has

Snieder, Roel

244

Fundamental electron-precursor-solid interactions derived from time dependent electron beam induced deposition simulations and experiments  

SciTech Connect (OSTI)

Unknown parameters critical to understanding the electron-precursor substrate interactions during electron beam induced deposition (EBID) have long limited our ability to fully control this nanoscale, directed assembly method. We report here values for the fundamental interaction parameters of D, the precursor surface diffusion coefficient, delta, the sticking probability and tau, the mean surface residence time which are critical parameters for understanding the assembly of EBID deposits. Values of D=6.4um2s-1, delta=0.0250 and tau=3.2ms were determined for a commonly used precursor molecule tungsten hexacarbonyl W(CO)6. Space and time predictions of the adsorbed precursor coverage C(r,t) were solved by an explicit finite differencing numerical scheme. Evolving nanopillar surface morphology was derived from solutions of C(r,t) considering electron induced dissociation as the critical depletion term. This made it possible to infer the space and time dependent precursor coverage both on, and around nanopillar structures to better understand local precursor dynamics during mass transport limited (MTL) and reaction rate limited (RRL) EBID.

Fowlkes, Jason Davidson [ORNL; Rack, Philip D [ORNL

2010-01-01T23:59:59.000Z

245

Triplet state photochemistry and the three-state crossing of acetophenone within time-dependent density-functional theory  

SciTech Connect (OSTI)

Even though time-dependent density-functional theory (TDDFT) works generally well for describing excited states energies and properties in the Franck-Condon region, it can dramatically fail in predicting photochemistry, notably when electronic state crossings occur. Here, we assess the ability of TDDFT to describe the photochemistry of an important class of triplet sensitizers, namely, aromatic ketones. We take acetophenone as a test molecule, for which accurate ab initio results exist in the literature. Triplet acetophenone is generated thanks to an exotic three-state crossing involving one singlet and two triplets states (i.e., a simultaneous intersystem crossing and triplet conical intersection), thus being a stringent test for approximate TDDFT. We show that most exchange-correlation functionals can only give a semi-qualitative picture of the overall photochemistry, in which the three-state crossing is rather represented as a triplet conical intersection separated from the intersystem crossing. The best result overall is given by the double hybrid functional mPW2PLYP, which is even able to reproduce quantitatively the three-state crossing region. We rationalize this results by noting that double hybrid functionals include a larger portion of double excitation character to the excited states.

Huix-Rotllant, Miquel, E-mail: miquel.huix@gmail.com; Ferré, Nicolas, E-mail: nicolas.ferre@univ-amu.fr [Institut de Chimie Radicalaire (UMR-7273), Aix-Marseille Université, CNRS, 13397 Marseille Cedex 20 (France)] [Institut de Chimie Radicalaire (UMR-7273), Aix-Marseille Université, CNRS, 13397 Marseille Cedex 20 (France)

2014-04-07T23:59:59.000Z

246

Time dependence of the {sup 137}Cs resuspension factor on the Romanian territory after the Chernobyl accident  

SciTech Connect (OSTI)

On the basis of the radioactivity levels in aerosol and atmospheric deposition samples due to the Chernobyl accident, the resuspension factor of {sup 137}Cs as a four-parameter function has been inferred. The standard procedure to derive the dependence of resuspension on time assumes that the initial deposit is instantaneous. A simple method assuming a constant deposition rate over a fixed period has been proposed. Also, based on existing experimental data, an attempt was made to consider a realistic time dependence of the deposition rate to cope with the particular case of the Chernobyl accident. The differences between the two models are outlined. The Chernobyl direct deposit has been assumed to be the deposit measured between 30 April and 30 June 1986. The calculated values of the resuspension factor are consistent with the IAEA`s recommended model and depend on the rainfall that occurred in June 1986 and the site-specific disturbance conditions during the first 100 d following 1 July 1986 and only on artificial disturbance by humans and vehicles after that. 16 refs., 5 figs., 3 tabs.

Mihaila, B. [Institute of Environmental Research and Engineering, Bucharest (Romania); Cuculeanu, V. [National Institute of Meteorology and Hydrology, Bucharest (Romania)

1994-08-01T23:59:59.000Z

247

Large-scale simulation of steady and time-dependent active suspensions with the force-coupling method  

E-Print Network [OSTI]

We present a new development of the force-coupling method (FCM) to address the accurate simulation of a large number of interacting micro-swimmers. Our approach is based on the squirmer model, which we adapt to the FCM framework, resulting in a method that is suitable for simulating semi-dilute squirmer suspensions. Other effects, such as steric interactions, can be readily considered with our model. We test our method by comparing the velocity field around a single squirmer and the pairwise interactions between two squirmers with exact solutions to the Stokes equations and results given by other numerical methods. We also illustrate our method's ability to describe spheroidal swimmer shapes and biologically-relevant time-dependent swimming gaits. We detail the numerical algorithm used to compute the hydrodynamic coupling between a large collection ($10^4-10 ^5$) of micro-swimmers. Using this methodology, we investigate the emergence of polar order in a suspension of squirmers and show that for large domains,...

Delmotte, Blaise; Plouraboue, Franck; Climent, Eric

2015-01-01T23:59:59.000Z

248

Multi-Scale Optical Coherence Tomography Imaging  

E-Print Network [OSTI]

Fourier domain optical coherence tomography and methods forspeed spectral-domain optical coherence tomography at 1.3umJ. G. (1991). Optical coherence tomography. Science, 254(

Oliveira, Michael

2014-01-01T23:59:59.000Z

249

Teleseismic-Seismic Monitoring At Walker-Lane Transitional Zone Region  

Open Energy Info (EERE)

At Walker-Lane Transitional Zone Region At Walker-Lane Transitional Zone Region (Biasi, Et Al., 2009) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Teleseismic-Seismic Monitoring At Walker-Lane Transitional Zone Region (Biasi, Et Al., 2009) Exploration Activity Details Location Walker-Lane Transition Zone Geothermal Region Exploration Technique Teleseismic-Seismic Monitoring Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Glenn Biasi, Leiph Preston, Ileana Tibuleac (2009) Body Wave Tomography For Regional Scale Assessment Of Geothermal Indicators In The Western Great Basin Retrieved from "http://en.openei.org/w/index.php?title=Teleseismic-Seismic_Monitoring_At_Walker-Lane_Transitional_Zone_Region_(Biasi,_Et_Al.,_2009)&oldid=425676"

250

Seismicity and seismic stress in the Coso Range, Coso geothermal...  

Open Energy Info (EERE)

are discussed in this paper. An analysis of fault-related seismicity in the region led us to conclude that the Little Lake fault and the Airport Lake fault are the most...

251

Seismic and infrasonic source processes in volcanic fluid systems  

E-Print Network [OSTI]

A broadband seismic and infrasound array deployment at MountNumerical experiments . . . . . . . .1. Seismic- acousticFigure 3.2: Infrasonic and seismic waveforms at CDWR for an

Matoza, Robin S.

2009-01-01T23:59:59.000Z

252

Seismic design, testing and analysis of reinforced concrete wall buildings  

E-Print Network [OSTI]

and Priestley M.J.N. (1992). “Seismic Design of Reinforced2007). “Displacement Based Seismic Design of Structures”.318-99 Provisions for Seismic Design of Structural Walls.

Panagiotou, Marios

2008-01-01T23:59:59.000Z

253

Downhole hydraulic seismic generator  

DOE Patents [OSTI]

A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabling, and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole.

Gregory, Danny L. (Corrales, NM); Hardee, Harry C. (Albuquerque, NM); Smallwood, David O. (Albuquerque, NM)

1992-01-01T23:59:59.000Z

254

DIAGNOSING THE TIME-DEPENDENCE OF ACTIVE REGION CORE HEATING FROM THE EMISSION MEASURE. I. LOW-FREQUENCY NANOFLARES  

SciTech Connect (OSTI)

Observational measurements of active region emission measures contain clues to the time dependence of the underlying heating mechanism. A strongly nonlinear scaling of the emission measure with temperature indicates a large amount of hot plasma relative to warm plasma. A weakly nonlinear (or linear) scaling of the emission measure indicates a relatively large amount of warm plasma, suggesting that the hot active region plasma is allowed to cool and so the heating is impulsive with a long repeat time. This case is called low-frequency nanoflare heating, and we investigate its feasibility as an active region heating scenario here. We explore a parameter space of heating and coronal loop properties with a hydrodynamic model. For each model run, we calculate the slope {alpha} of the emission measure distribution EM(T){proportional_to}T {sup {alpha}}. Our conclusions are: (1) low-frequency nanoflare heating is consistent with about 36% of observed active region cores when uncertainties in the atomic data are not accounted for; (2) proper consideration of uncertainties yields a range in which as many as 77% of observed active regions are consistent with low-frequency nanoflare heating and as few as zero; (3) low-frequency nanoflare heating cannot explain observed slopes greater than 3; (4) the upper limit to the volumetric energy release is in the region of 50 erg cm{sup -3} to avoid unphysical magnetic field strengths; (5) the heating timescale may be short for loops of total length less than 40 Mm to be consistent with the observed range of slopes; (6) predicted slopes are consistently steeper for longer loops.

Bradshaw, S. J.; Reep, J. W. [Department of Physics and Astronomy, Rice University, Houston, TX 77005 (United States); Klimchuk, J. A., E-mail: stephen.bradshaw@rice.edu, E-mail: jeffrey.reep@rice.edu, E-mail: james.a.klimchuk@nasa.gov [NASA Goddard Space Flight Center, Solar Physics Lab., Code 671, 8800 Greenbelt Road, Greenbelt, MD 20771 (United States)

2012-10-10T23:59:59.000Z

255

Electron dynamics in complex environments with real-time time dependent density functional theory in a QM-MM framework  

SciTech Connect (OSTI)

This article presents a time dependent density functional theory (TDDFT) implementation to propagate the Kohn-Sham equations in real time, including the effects of a molecular environment through a Quantum-Mechanics Molecular-Mechanics (QM-MM) hamiltonian. The code delivers an all-electron description employing Gaussian basis functions, and incorporates the Amber force-field in the QM-MM treatment. The most expensive parts of the computation, comprising the commutators between the hamiltonian and the density matrix—required to propagate the electron dynamics—, and the evaluation of the exchange-correlation energy, were migrated to the CUDA platform to run on graphics processing units, which remarkably accelerates the performance of the code. The method was validated by reproducing linear-response TDDFT results for the absorption spectra of several molecular species. Two different schemes were tested to propagate the quantum dynamics: (i) a leap-frog Verlet algorithm, and (ii) the Magnus expansion to first-order. These two approaches were confronted, to find that the Magnus scheme is more efficient by a factor of six in small molecules. Interestingly, the presence of iron was found to seriously limitate the length of the integration time step, due to the high frequencies associated with the core-electrons. This highlights the importance of pseudopotentials to alleviate the cost of the propagation of the inner states when heavy nuclei are present. Finally, the methodology was applied to investigate the shifts induced by the chemical environment on the most intense UV absorption bands of two model systems of general relevance: the formamide molecule in water solution, and the carboxy-heme group in Flavohemoglobin. In both cases, shifts of several nanometers are observed, consistently with the available experimental data.

Morzan, Uriel N.; Ramírez, Francisco F.; Scherlis, Damián A., E-mail: damian@qi.fcen.uba.ar, E-mail: mcgl@qb.ffyb.uba.ar [Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, Buenos Aires (C1428EHA) (Argentina); Oviedo, M. Belén; Sánchez, Cristián G. [Departamento de Matemática y Física, Facultad de Ciencias Químicas, INFIQC, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba (Argentina)] [Departamento de Matemática y Física, Facultad de Ciencias Químicas, INFIQC, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba (Argentina); Lebrero, Mariano C. González, E-mail: damian@qi.fcen.uba.ar, E-mail: mcgl@qb.ffyb.uba.ar [Instituto de Química y Fisicoquímica Biológicas, IQUIFIB, CONICET (Argentina)] [Instituto de Química y Fisicoquímica Biológicas, IQUIFIB, CONICET (Argentina)

2014-04-28T23:59:59.000Z

256

Frequent-Interval Seismic CPTu  

Broader source: Energy.gov (indexed) [DOE]

Frequent-Interval Frequent-Interval Seismic CPTu D. Bruce Nothdurft, MSCE, PE, PG SRS Geotechnical Engineering Department Savannah River Nuclear Solutions Alec V. McGillivray, PhD, PE Geotechnical Consultant Brent J. Gutierrez, PhD, PE NPH Engineering Manager, DOE-SR Motivation  The seismic piezocone penetration test (SCPTu) utilized at SRS because it provides rapid and thorough site characterization.  Evaluation of non-linear soil behavior...  detailed stratigraphy  small-strain velocity measurements  large-strain non-seismic measurements  Depth scale disparity  large-strain non-seismic measurements nearly continuous with depth  small-strain velocity measurements over 1 m depth intervals. 2 October 25-26, 2011 DOE NPH Conference

257

How to Remedy Non-optimal Seismic Data by Seismic Processing  

Science Journals Connector (OSTI)

—Seismic data processing mostly takes into account the ... be done by subtractive coherency filtering. Multiple seismic reflections also can be suppressed by this...

J. Fertig; M. Thomas; R. Thomas

1999-09-01T23:59:59.000Z

258

Down hole periodic seismic generator  

DOE Patents [OSTI]

A down hole periodic seismic generator system for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.

Hardee, Harry C. (Albuquerque, NM); Hills, Richard G. (Las Cruces, NM); Striker, Richard P. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

259

Advanced downhole periodic seismic generator  

DOE Patents [OSTI]

An advanced downhole periodic seismic generator system for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.

Hardee, Harry C. (Albuquerque, NM); Hills, Richard G. (Las Cruces, NM); Striker, Richard P. (Albuquerque, NM)

1991-07-16T23:59:59.000Z

260

Definition: Active Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

Seismic Techniques Seismic Techniques Jump to: navigation, search Dictionary.png Active Seismic Techniques Active seismic techniques study the behavior of artificially-generated elastic waves in the subsurface. A seismic wave or pulse is generated at the surface by an active seismic source which can be a vibration, mechanical impact, or near-surface explosion.[1] View on Wikipedia Wikipedia Definition Seismic waves are waves of energy that travel through the Earth's layers, and are a result of an earthquake, explosion, or a volcano that imparts low-frequency acoustic energy. Many other natural and anthropogenic sources create low amplitude waves commonly referred to as ambient vibrations. Seismic waves are studied by geophysicists called seismologists. Seismic wave fields are recorded by a seismometer,

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Geometric Tomography: A Limited-View Approach for Computed Tomography  

E-Print Network [OSTI]

Geometric Tomography: A Limited-View Approach for Computed Tomography Peter B. Noël, Jinhui Xu Keywords Computed Tomography; Geometric Compressed Sensing; Topo- logical Peeling. ABSTRACT Computed to generate 3D data, denoted f, directly from projec- tions, denoted g. Thus, the projection relationship can

Corso, Jason J.

262

Large-Scale Uncertainty and Error Analysis for Time-dependent Fluid/Structure Interactions in Wind Turbine Applications  

SciTech Connect (OSTI)

The following is the final report covering the entire period of this aforementioned grant, June 1, 2011 - May 31, 2013 for the portion of the effort corresponding to Stanford University (SU). SU has partnered with Sandia National Laboratories (PI: Mike S. Eldred) and Purdue University (PI: Dongbin Xiu) to complete this research project and this final report includes those contributions made by the members of the team at Stanford. Dr. Eldred is continuing his contributions to this project under a no-cost extension and his contributions to the overall effort will be detailed at a later time (once his effort has concluded) on a separate project submitted by Sandia National Laboratories. At Stanford, the team is made up of Profs. Alonso, Iaccarino, and Duraisamy, post-doctoral researcher Vinod Lakshminarayan, and graduate student Santiago Padron. At Sandia National Laboratories, the team includes Michael Eldred, Matt Barone, John Jakeman, and Stefan Domino, and at Purdue University, we have Prof. Dongbin Xiu as our main collaborator. The overall objective of this project was to develop a novel, comprehensive methodology for uncertainty quantification by combining stochastic expansions (nonintrusive polynomial chaos and stochastic collocation), the adjoint approach, and fusion with experimental data to account for aleatory and epistemic uncertainties from random variable, random field, and model form sources. The expected outcomes of this activity were detailed in the proposal and are repeated here to set the stage for the results that we have generated during the time period of execution of this project: 1. The rigorous determination of an error budget comprising numerical errors in physical space and statistical errors in stochastic space and its use for optimal allocation of resources; 2. A considerable increase in efficiency when performing uncertainty quantification with a large number of uncertain variables in complex non-linear multi-physics problems; 3. A solution to the long-time integration problem of spectral chaos approaches; 4. A rigorous methodology to account for aleatory and epistemic uncertainties, to emphasize the most important variables via dimension reduction and dimension-adaptive refinement, and to support fusion with experimental data using Bayesian inference; 5. The application of novel methodologies to time-dependent reliability studies in wind turbine applications including a number of efforts relating to the uncertainty quantification in vertical-axis wind turbine applications. In this report, we summarize all accomplishments in the project (during the time period specified) focusing on advances in UQ algorithms and deployment efforts to the wind turbine application area. Detailed publications in each of these areas have also been completed and are available from the respective conference proceedings and journals as detailed in a later section.

Alonso, Juan J. [Stanford University; Iaccarino, Gianluca [Stanford University

2013-08-25T23:59:59.000Z

263

Interactive seismic facies classification using textural attributes and neural networks  

Science Journals Connector (OSTI)

...between seismic data, seismic facies, environment of deposition (EOD), and rock property relationships. Here, typical deepwater...between seismic data, seismic facies, environment of deposition (EOD), and rock property relationships. Here, typical deepwater...

Brian P. West; Steve R. May; John E. Eastwood; Christine Rossen

264

How can Seismics, Especially Active, Assist in Geothermal Energy Utilization  

Science Journals Connector (OSTI)

Thus, many possibilities exist where seismics, especially active seismics, may be helpful in the utilization of geothermal energy.

Th. Krey

1980-01-01T23:59:59.000Z

265

Enhanced migration of seismic data  

SciTech Connect (OSTI)

The so-called enhanced migration which uses diffraction tomography as the repair tool for correction of amplitudes (reflection coefficients) of migrated sections is discussed. As with any linearized procedure, diffraction tomography requires knowledge of the initial model. It is suggested that the initial model is taken as the migrated image. It will be demonstrated that diffraction tomography applied to the data residuals improves the amplitudes of the migrated images. Migration is redefined as the reconstruction of the wavefront sets of distributions (reflection interfaces), and the inversion process as tomographic correction of migrated images.

Carrion, P.M. (PPPG/UFBA, Instituto de Geociencias, Rua Gaetano Moura 123, Federacao, 40.210 Salvador, Bahia (BR))

1990-10-01T23:59:59.000Z

266

Waste inspection tomography (WIT)  

SciTech Connect (OSTI)

The WIT program will provide an inspection system that offers the nuclear waste evaluator a unique combination of tools for regulatory-driven characterization of low-level waste (LLW), transuranic waste (TRU), and mixed waste drums. WIT provides nondestructive, noninvasive, and environmentally safe inspections using X-ray and gamma ray technologies, with reasonable cost and throughput. Two emission imaging techniques will be employed for characterizing materials in waste containers. The first of these is gamma emission tomography, commonly called single-photon emission computed tomography (SPECT). Rather than using an external radiation source, SPECT uses the emission of radioactive materials within the object of interest for imaging. In this case, emission from actual nuclear waste within a container will provide a three-dimensional image of the radioactive substances in the container. The second emission technique will use high-purity germanium detectors for gamma ray spectroscopy. This technique, called nondestructive assay (NDA), can identify the emitting isotopic species and strength. Work in emission tomography and assay of nuclear waste has been undertaken at Lawrence Livermore National Laboratory using a technique called Passive Tomography. Results from a process development unit are presented.

Bernardi, R.T.; Han, K.S.

1994-12-31T23:59:59.000Z

267

Exact relations of the quasienergy functional and the exchange-correlation potential from the Floquet formulation of time-dependent density functional theory  

E-Print Network [OSTI]

the Floquet formulation of time-dependent density functional theory Dmitry A. Telnov and Shih-I Chu Department-dependent density functional theory we present several exact relations involving different parts of the quasienergy.012514 PACS number s : 71.45.Gm, 71.15.Mb, 31.15.Ew I. INTRODUCTION Time-independent density functional theory

Chu, Shih-I

268

Generalized time-dependent density-functional-theory response functions for spontaneous density fluctuations and nonlinear response: Resolving the causality paradox in real time  

E-Print Network [OSTI]

Generalized time-dependent density-functional-theory response functions for spontaneous density shifted the focus of elec- tronic structure theory from the many-body wave function to the charge density response and spontaneous fluctuations of many-electron systems. The pth-order density response functions

Mukamel, Shaul

269

Radiated seismic energy from coda measurements and no scaling in apparent stress with seismic moment  

E-Print Network [OSTI]

Radiated seismic energy from coda measurements and no scaling in apparent stress with seismic energy are consistent with independent measurements, where available. We find no dependence in individual seismic energy from coda measurements and no scaling in apparent stress with seismic moment, J. Geophys

Prieto, Germán A.

270

Subsurface imaging with reverse vertical seismic profiles  

E-Print Network [OSTI]

This thesis presents imaging results from a 3D reverse vertical seismic profile (RVSP) dataset measured at a hydrocarbon bearing pinnacle reef in northern Michigan. The study presented many challenges in seismic data ...

Krasovec, Mary L. (Mary Lee), 1972-

2001-01-01T23:59:59.000Z

271

Seismic Attribute Analysis Using Higher Order Statistics  

E-Print Network [OSTI]

Seismic data processing depends on mathematical and statistical tools such as convolution, crosscorrelation and stack that employ second-order statistics (SOS). Seismic signals are non-Gaussian and therefore contain information beyond SOS. One...

Greenidge, Janelle Candice

2009-05-15T23:59:59.000Z

272

Seismic imaging using higher order statistics  

E-Print Network [OSTI]

Improvements in seismic resolution beyond typical seismic wavelength will have significant implications for hydrocarbon exploration and production. Conventional imaging algorithms can be derived as a least squared optimization problem in which...

Srinivasan, Karthik

2012-06-07T23:59:59.000Z

273

Definition: Vertical Seismic Profiling | Open Energy Information  

Open Energy Info (EERE)

Profiling Profiling Jump to: navigation, search Dictionary.png Vertical Seismic Profiling Vertical Seismic Profile (VSP) is a technique of seismic measurements used for high resolution seismic imaging. It can also be used for correlation with surface seismic data providing velocity information and information for processing such as deconvolution parameters. The defining characteristic of a VSP is that the detectors are in a borehole.[1][2][3] View on Wikipedia Wikipedia Definition Also Known As Advanced Borehole Seismology (ABS), Related Terms Seismic Techniques, High Resolution Imaging and Monitoring References ↑ Bob Hardage VSP Principles ↑ High resolution 3D seismic imaging using 3C data from large downhole seismic arrays Paulsson et al. (2004) ↑ Mueller Soroka Paulsson (2010)

274

A Lumped Model for a Seismic Source  

Science Journals Connector (OSTI)

...research-article A Lumped Model for a Seismic Source M. S. Giammarinaro S. Micciancio...parameters are dimensionless and describe: the seismic wave quality factor of the medium (Q...results are: (i) the system exhibits a seismic or an aseismic steady state solution...

1993-01-01T23:59:59.000Z

275

Seismic scattering in the subduction zone of the Middle America region  

E-Print Network [OSTI]

vi 4 Scattering of seismic waves in heterogenousvii 6 Evaluation of seismic scattering usingan alternative seismic network . .

Dominguez, Luis Antonio

2012-01-01T23:59:59.000Z

276

Neutron computed tomography  

E-Print Network [OSTI]

to make the Donner Algorithms run. TABLE OF CONTEliiTS CHAPTF. . R I NEI. TRON RADIOGRAPHY . I. 1 Background . I. 2 Theory . l. 3 Neutron Beam Characterization I. 4 Image Detectors . COMPI'TED TOMOGRAPHY . Il I Background . II. 2 Notation II. 3... data which is generated by rays traveling (and being attenuated) in straight lines. However in neutron radiography, what is measured is, to most extents, the levels of neutrons which are not attenuated. Neutrons are particles. They scatter...

Russell, Clifford Marlow

2012-06-07T23:59:59.000Z

277

Computed Tomography Status  

DOE R&D Accomplishments [OSTI]

Computed tomography (CT) is a relatively new radiographic technique which has become widely used in the medical field, where it is better known as computerized axial tomographic (CAT) scanning. This technique is also being adopted by the industrial radiographic community, although the greater range of densities, variation in samples sizes, plus possible requirement for finer resolution make it difficult to duplicate the excellent results that the medical scanners have achieved.

Hansche, B. D.

1983-00-00T23:59:59.000Z

278

Active Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

Active Seismic Techniques Active Seismic Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Active Seismic Techniques Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Seismic Techniques Parent Exploration Technique: Seismic Techniques Information Provided by Technique Lithology: Rock unit density influences elastic wave velocities. Stratigraphic/Structural: Structural geology- faults, folds, grabens, horst blocks, sedimentary layering, discontinuities, etc. Hydrological: Combining compressional and shear wave results can indicate the presence of fluid saturation in the formation. Thermal: High temperatures and pressure impact the compressional and shear wave velocities.

279

Teleseismic-Seismic Monitoring | Open Energy Information  

Open Energy Info (EERE)

Teleseismic-Seismic Monitoring Teleseismic-Seismic Monitoring Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Teleseismic-Seismic Monitoring Details Activities (33) Areas (18) Regions (5) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Seismic Techniques Parent Exploration Technique: Passive Seismic Techniques Information Provided by Technique Lithology: Rock unit density influences elastic wave velocities. Stratigraphic/Structural: Map geothermal reservoir geometry. Structural geology- faults, folds, grabens, horst blocks, sedimentary layering, discontinuities, etc. Hydrological: Combining compressional and shear wave results can indicate the presence of fluid saturation in the formation.

280

Vertical Seismic Profiling | Open Energy Information  

Open Energy Info (EERE)

Vertical Seismic Profiling Vertical Seismic Profiling Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Vertical Seismic Profiling Details Activities (4) Areas (3) Regions (1) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Borehole Seismic Techniques Parent Exploration Technique: Borehole Seismic Techniques Information Provided by Technique Lithology: Rock unit density influences elastic wave velocities. Stratigraphic/Structural: Structural geology- faults, folds, grabens, horst blocks, sedimentary layering, discontinuities, etc. Hydrological: Combining compressional and shear wave results can indicate the presence of fluid saturation in the formation. Thermal: High temperatures and pressure impact the compressional and shear wave velocities.

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Passive Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

Passive Seismic Techniques Passive Seismic Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Passive Seismic Techniques Details Activities (0) Areas (0) Regions (0) NEPA(4) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Seismic Techniques Parent Exploration Technique: Seismic Techniques Information Provided by Technique Lithology: Rock unit density influences elastic wave velocities. Stratigraphic/Structural: Structural geology- faults, folds, grabens, horst blocks, sedimentary layering, discontinuities, etc. Hydrological: Combining compressional and shear wave results can indicate the presence of fluid saturation in the formation. Thermal: High temperatures and pressure impact the compressional and shear wave velocities.

282

Enhanced local tomography  

DOE Patents [OSTI]

Local tomography is enhanced to determine the location and value of a discontinuity between a first internal density of an object and a second density of a region within the object. A beam of radiation is directed in a predetermined pattern through the region of the object containing the discontinuity. Relative attenuation data of the beam is determined within the predetermined pattern having a first data component that includes attenuation data through the region. In a first method for evaluating the value of the discontinuity, the relative attenuation data is inputted to a local tomography function .function..sub..LAMBDA. to define the location S of the density discontinuity. The asymptotic behavior of .function..sub..LAMBDA. is determined in a neighborhood of S, and the value for the discontinuity is estimated from the asymptotic behavior of .function..sub..LAMBDA.. In a second method for evaluating the value of the discontinuity, a gradient value for a mollified local tomography function .gradient..function..sub..LAMBDA..epsilon. (x.sub.ij) is determined along the discontinuity; and the value of the jump of the density across the discontinuity curve (or surface) S is estimated from the gradient values.

Katsevich, Alexander J. (Los Alamos, NM); Ramm, Alexander G. (Manhattan, KS)

1996-01-01T23:59:59.000Z

283

Generalized local emission tomography  

DOE Patents [OSTI]

Emission tomography enables locations and values of internal isotope density distributions to be determined from radiation emitted from the whole object. In the method for locating the values of discontinuities, the intensities of radiation emitted from either the whole object or a region of the object containing the discontinuities are inputted to a local tomography function .function..sub..LAMBDA..sup.(.PHI.) to define the location S of the isotope density discontinuity. The asymptotic behavior of .function..sub..LAMBDA..sup.(.PHI.) is determined in a neighborhood of S, and the value for the discontinuity is estimated from the asymptotic behavior of .function..sub..LAMBDA..sup.(.PHI.) knowing pointwise values of the attenuation coefficient within the object. In the method for determining the location of the discontinuity, the intensities of radiation emitted from an object are inputted to a local tomography function .function..sub..LAMBDA..sup.(.PHI.) to define the location S of the density discontinuity and the location .GAMMA. of the attenuation coefficient discontinuity. Pointwise values of the attenuation coefficient within the object need not be known in this case.

Katsevich, Alexander J. (Los Alamos, NM)

1998-01-01T23:59:59.000Z

284

Caucasus Seismic Information Network: Data and Analysis Final Report  

SciTech Connect (OSTI)

The geology and tectonics of the Caucasus region (Armenia, Azerbaijan, and Georgia) are highly variable. Consequently, generating a structural model and characterizing seismic wave propagation in the region require data from local seismic networks. As of eight years ago, there was only one broadband digital station operating in the region – an IRIS station at Garni, Armenia – and few analog stations. The Caucasus Seismic Information Network (CauSIN) project is part of a nulti-national effort to build a knowledge base of seismicity and tectonics in the region. During this project, three major tasks were completed: 1) collection of seismic data, both in event catalogus and phase arrival time picks; 2) development of a 3-D P-wave velocity model of the region obtained through crustal tomography; 3) advances in geological and tectonic models of the region. The first two tasks are interrelated. A large suite of historical and recent seismic data were collected for the Caucasus. These data were mainly analog prior to 2000, and more recently, in Georgia and Azerbaijan, the data are digital. Based on the most reliable data from regional networks, a crustal model was developed using 3-D tomographic inversion. The results of the inversion are presented, and the supporting seismic data are reported. The third task was carried out on several fronts. Geologically, the goal of obtaining an integrated geological map of the Caucasus on a scale of 1:500,000 was initiated. The map for Georgia has been completed. This map serves as a guide for the final incorporation of the data from Armenia and Azerbaijan. Description of the geological units across borders has been worked out and formation boundaries across borders have been agreed upon. Currently, Armenia and Azerbaijan are working with scientists in Georgia to complete this task. The successful integration of the geologic data also required addressing and mapping active faults throughout the greater Caucasus. Each of the major faults in the region were identified and the probability of motion were assessed. Using field data and seismicity, the relative activity on each of these faults was determined. Furthermore, the sense of motion along the faults was refined using GPS, fault plane solutions, and detailed field studies. During the course of the integration of the active fault data, the existence of the proposed strike slip Borjomi-Kazbeki fault was brought into question. Although it had been incorporated in many active tectonic models over the past decade, field geologists and geophysicists in Georgia questioned its existence. Detailed field studies were carried out to determine the existence of the fault and estimate the slip along it; and it was found that the fault zone did not exist. Therefore, the convergence rate in the greater Caucasus must be reinterpreted in terms of thrust mechanisms, instead of strike-slip on the Borjomi-Kazbeki fault zone.

Randolph Martin; Mary Krasovec; Spring Romer; Timothy O'Connor; Emanuel G. Bombolakis; Youshun Sun; Nafi Toksoz

2007-02-22T23:59:59.000Z

285

Frequent-Interval Seismic CPTu  

Broader source: Energy.gov [DOE]

Frequent-Interval Seismic CPTu D. Bruce Nothdurft, MSCE, PE, PG SRS Geotechnical Engineering Department Savannah River Nuclear Solutions Alec V. McGillivray, PhD, PE Geotechnical Consultant Brent J. Gutierrez, PhD, PE NPH Engineering Manager, DOE-SR

286

Deterministic seismic hazard in Egypt  

Science Journals Connector (OSTI)

......interest are represented by a number of flat layers with different thicknesses, densities...one on sandy soil, the other on the rocky soil in Aqaba) were 0.10 and 0.05...Contract UVO-ROSTE 875.669.9 Seismic safety of urban areas: ground motion modelling......

A. El-Sayed; F. Vaccari; G. F. Panza

2001-03-01T23:59:59.000Z

287

USING MICRO-SEISMICITY AND SEISMIC VELOCITIES TO MAP SUBSURFACE GEOLOGIC  

Open Energy Info (EERE)

USING MICRO-SEISMICITY AND SEISMIC VELOCITIES TO MAP SUBSURFACE GEOLOGIC USING MICRO-SEISMICITY AND SEISMIC VELOCITIES TO MAP SUBSURFACE GEOLOGIC AND HYDROLOGIC STRUCTURE WITHIN THE COSO GEOTHERMAL FIELD, CALIFORNIA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: USING MICRO-SEISMICITY AND SEISMIC VELOCITIES TO MAP SUBSURFACE GEOLOGIC AND HYDROLOGIC STRUCTURE WITHIN THE COSO GEOTHERMAL FIELD, CALIFORNIA Details Activities (1) Areas (1) Regions (0) Abstract: We relocate 14 years of seismicity in the Coso Geothermal Field using differential travel times and simultaneously invert for seismic velocities to improve our knowledge of the subsurface geologic and hydrologic structure. We utilize over 60,000 micro-seismic events using waveform crosscorrelation to augment the expansive catalog of Pand S-wave

288

A fast method for solving both the time-dependent Schroedinger equation in angular coordinates and its associated 'm-mixing' problem  

SciTech Connect (OSTI)

An efficient split-operator technique for solving the time-dependent Schroedinger equation in an angular coordinate system is presented, where a fast spherical harmonics transform accelerates the conversions between angle and angular momentum representations. Unlike previous techniques, this method features facile inclusion of azimuthal asymmetries (solving the ''m-mixing'' problem), adaptive time stepping, and favorable scaling, while simultaneously avoiding the need for both kinetic and potential energy matrix elements. Several examples are presented.

Reuter, Matthew G.; Ratner, Mark A.; Seideman, Tamar [Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113 (United States)

2009-09-07T23:59:59.000Z

289

Seismic Isolation Working Meeting Gap Analysis Report  

SciTech Connect (OSTI)

The ultimate goal in nuclear facility and nuclear power plant operations is operating safety during normal operations and maintaining core cooling capabilities during off-normal events including external hazards. Understanding the impact external hazards, such as flooding and earthquakes, have on nuclear facilities and NPPs is critical to deciding how to manage these hazards to expectable levels of risk. From a seismic risk perspective the goal is to manage seismic risk. Seismic risk is determined by convolving the seismic hazard with seismic fragilities (capacity of systems, structures, and components (SSCs)). There are large uncertainties associated with evolving nature of the seismic hazard curves. Additionally there are requirements within DOE and potential requirements within NRC to reconsider updated seismic hazard curves every 10 years. Therefore opportunity exists for engineered solutions to manage this seismic uncertainty. One engineered solution is seismic isolation. Current seismic isolation (SI) designs (used in commercial industry) reduce horizontal earthquake loads and protect critical infrastructure from the potentially destructive effects of large earthquakes. The benefit of SI application in the nuclear industry is being recognized and SI systems have been proposed, in the American Society of Civil Engineers (ASCE) 4 standard, to be released in 2014, for Light Water Reactors (LWR) facilities using commercially available technology. However, there is a lack of industry application to the nuclear industry and uncertainty with implementing the procedures outlined in ASCE-4. Opportunity exists to determine barriers associated with implementation of current ASCE-4 standard language.

Justin Coleman; Piyush Sabharwall

2014-09-01T23:59:59.000Z

290

Positron Emission Tomography (PET)  

DOE R&D Accomplishments [OSTI]

Positron emission tomography (PET) assesses biochemical processes in the living subject, producing images of function rather than form. Using PET, physicians are able to obtain not the anatomical information provided by other medical imaging techniques, but pictures of physiological activity. In metaphoric terms, traditional imaging methods supply a map of the body's roadways, its, anatomy; PET shows the traffic along those paths, its biochemistry. This document discusses the principles of PET, the radiopharmaceuticals in PET, PET research, clinical applications of PET, the cost of PET, training of individuals for PET, the role of the United States Department of Energy in PET, and the futures of PET.

Welch, M. J.

1990-01-00T23:59:59.000Z

291

Radial reflection diffraction tomography  

DOE Patents [OSTI]

A wave-based tomographic imaging method and apparatus based upon one or more rotating radially outward oriented transmitting and receiving elements have been developed for non-destructive evaluation. At successive angular locations at a fixed radius, a predetermined transmitting element can launch a primary field and one or more predetermined receiving elements can collect the backscattered field in a "pitch/catch" operation. A Hilbert space inverse wave (HSIW) algorithm can construct images of the received scattered energy waves using operating modes chosen for a particular application. Applications include, improved intravascular imaging, bore hole tomography, and non-destructive evaluation (NDE) of parts having existing access holes.

Lehman, Sean K.

2012-12-18T23:59:59.000Z

292

High energy neutron Computed Tomography developed  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

objects. May 9, 2014 Neutron tomography horizontal "slice" of a tungsten and polyethylene test object containing tungsten carbide BBs. Neutron tomography horizontal "slice"...

293

Electrical Impedance Tomography Liliana Borcea  

E-Print Network [OSTI]

Electrical Impedance Tomography Liliana Borcea #3; September 3, 2002 Abstract We review theoretical and numerical studies of the inverse problem of electrical impedance tomography which seeks the electrical conductivity and permittivity inside a body, given simul- taneous measurements of electrical currents

Borcea, Liliana

294

Seismicity and seismic stress in the Coso Range, Coso geothermal field, and  

Open Energy Info (EERE)

Seismicity and seismic stress in the Coso Range, Coso geothermal field, and Seismicity and seismic stress in the Coso Range, Coso geothermal field, and Indian Wells Valley region, Southeast-Central California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Book: Seismicity and seismic stress in the Coso Range, Coso geothermal field, and Indian Wells Valley region, Southeast-Central California Details Activities (1) Areas (1) Regions (0) Abstract: The temporal and spatial distribution of seismicity in the Coso Range, the Coso geothermal field, and the Indian Wells Valley region of southeast-central California are discussed in this paper. An analysis of fault-related seismicity in the region led us to conclude that the Little Lake fault and the Airport Lake fault are the most significant seismogenic zones. The faulting pattern clearly demarcates the region as a transition

295

Tube-wave seismic imaging  

DOE Patents [OSTI]

The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (111), travels in the source well (110), is coupled to a geological feature (140), propagates (151) through the geological feature (140), is coupled back to a tube-wave (152) at a receiver well (120), and is and received by receiver(s) (121) in either the same (110) or a different receiving well (120). The tube-wave has been shown to be extremely sensitive to changes in reservoir characteristics. Tube-waves appear to couple most effectively to reservoirs where the well casing is perforated, allowing direct fluid contact from the interior of a well case to the reservoir.

Korneev, Valeri A [LaFayette, CA

2009-05-05T23:59:59.000Z

296

Nuclear component horizontal seismic restraint  

DOE Patents [OSTI]

A nuclear component horizontal seismic restraint. Small gaps limit horizontal displacement of components during a seismic occurrence and therefore reduce dynamic loadings on the free lower end. The reactor vessel and reactor guard vessel use thicker section roll-forged rings welded between the vessel straight shell sections and the bottom hemispherical head sections. The inside of the reactor guard vessel ring forging contains local vertical dovetail slots and upper ledge pockets to mount and retain field fitted and installed blocks. As an option, the horizontal displacement of the reactor vessel core support cone can be limited by including shop fitted/installed local blocks in opposing alignment with the reactor vessel forged ring. Beams embedded in the wall of the reactor building protrude into apertures in the thermal insulation shell adjacent the reactor guard vessel ring and have motion limit blocks attached thereto to provide to a predetermined clearance between the blocks and reactor guard vessel ring.

Snyder, Glenn J. (Lynchburg, VA)

1988-01-01T23:59:59.000Z

297

Tube-wave seismic imaging  

DOE Patents [OSTI]

The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (111), travels in the source well (110), is coupled to a geological feature (140), propagates (151) through the geological feature (140), is coupled back to a tube-wave (152) at a receiver well (120), and is and received by receiver(s) (121) in either the same (110) or a different receiving well (120). The tube-wave has been shown to be extremely sensitive to changes in reservoir characteristics. Tube-waves appear to couple most effectively to reservoirs where the well casing is perforated, allowing direct fluid contact from the interior of a well case to the reservoir.

Korneev, Valeri A. (Lafayette, CA); Bakulin, Andrey (Houston, TX)

2009-10-13T23:59:59.000Z

298

Seismic Hazard and Public Safety  

E-Print Network [OSTI]

International Seismic Safety Organization (ISSO) has been formed to promote public safety by being prepared for the largest potential events which can happen at any time, rather than for certain probable events which have been exceeded in several recent earthquakes with disastrous consequences. The position of ISSO is available now in English, Italian, Russian, Hebrew, Spanish, and Hindi at http://www.issoquake.org. That position has been misrepresented elsewhere and this short note is to counter such inaccurate viewpoints.

Mualchin, Lalliana

2014-01-01T23:59:59.000Z

299

A seismic signature of river bedload transport during storm events  

E-Print Network [OSTI]

2008), Spectral analysis of seismic noise induced by rivers:analysis of high?frequency seismic noise, J. Geophys. Res. ,and V. Manville (2009), Seismic sig- nals of snow?slurry

Brodsky, Emily E.; Hsu, Leslie; Finnegan, Noah J.

2011-01-01T23:59:59.000Z

300

Performance Based Implementation of Seismic Protective Devices for Structures  

E-Print Network [OSTI]

A.I. , Wu, B. (2012). “Seismic Protection of Nonlinearfor the Evaluation of Seismic Mitigation in BuildingM.H. and Sung, Y.C. (2000). “Seismic Performance of Highway

Xi, Wang

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Nonlinear seismic response analysis of steel-concrete composite frames  

E-Print Network [OSTI]

frame model 10TN (Northridge seismic input) floor 1 floor 2frame model 10TC (Northridge seismic input) Slip (mm) floorframe models 06TC, 10TC and 14TC (Northridge seismic input)

Barbato, Michele

2008-01-01T23:59:59.000Z

302

Density functional approaches to collective phenomena in nuclei: Time-dependent density-functional theory for perturbative and non-perturbative nuclear dynamics  

E-Print Network [OSTI]

We present the basic concepts and our recent developments in the density functional approaches with the Skyrme functionals for describing nuclear dynamics at low energy. The time-dependent density-functional theory (TDDFT) is utilized for the exact linear response with an external perturbation. For description of collective dynamics beyond the perturbative regime, we present a theory of a decoupled collective submanifold to describe for a slow motion based on the TDDFT. Selected applications are shown to demonstrate the quality of their performance and feasibility. Advantages and disadvantages in the numerical aspects are also discussed.

Takashi Nakatsukasa

2012-10-01T23:59:59.000Z

303

Non-Born–Oppenheimer molecular wave functions of H2 by extended multi-configuration time-dependent Hartree–Fock method  

Science Journals Connector (OSTI)

Abstract A ground state wave function of a one-dimensional H2 molecule is derived numerically by the extended multi-configuration time-dependent Hartree–Fock (MCTDHF) method. The electronic orbitals and the amplitudes for the nuclear motion constituting the ground-state wave function are derived by solving the coupled equations of motion by the imaginary time propagation. Comparisons with the results obtained by the Born–Huang (BH) expansion method as well as with the exact wave function reveal that the memory size required in the extended MCTDHF method is about two orders of magnitude smaller than in the BH expansion method.

Yoshihiro Ide; Tsuyoshi Kato; Kaoru Yamanouchi

2014-01-01T23:59:59.000Z

304

Exact relations of the quasienergy functional and the exchange-correlation potential from the Floquet formulation of time-dependent density functional theory  

E-Print Network [OSTI]

uri2rju U F L , ~7!Exact relations of the quasienergy functio from the Floquet formulation of tim Dmitry A. Telno Department of Chemistry, University of Kansas, and Kansas Ce ~Received 15 July 2000; pu In the framework of the Floquet formulation... monochromatic field! to illustrate the general appli- cability of the exact relations. The model has some intrinsic limitations since it exhibits the motion prescribed by the har- monic potential theorem, which is only a subset of general time-dependent behavior...

Telnov, Dmitry A.; Chu, Shih-I

2000-12-13T23:59:59.000Z

305

Infrasound Generation from the HH Seismic Hammer.  

SciTech Connect (OSTI)

The HH Seismic hammer is a large, %22weight-drop%22 source for active source seismic experiments. This system provides a repetitive source that can be stacked for subsurface imaging and exploration studies. Although the seismic hammer was designed for seismological studies it was surmised that it might produce energy in the infrasonic frequency range due to the ground motion generated by the 13 metric ton drop mass. This study demonstrates that the seismic hammer generates a consistent acoustic source that could be used for in-situ sensor characterization, array evaluation and surface-air coupling studies for source characterization.

Jones, Kyle Richard

2014-10-01T23:59:59.000Z

306

LLNL-TR-400563 Seismic Data  

National Nuclear Security Administration (NNSA)

Seismic Data for Evaluation of Ground Motion Hazards in Las Vegas in Support of Test Site Readiness Ground Motion A. Rodgers January 18, 2008 Disclaimer This document was...

307

Leasing and Exploration * Seismic geophysical surveys  

E-Print Network [OSTI]

#12;Leasing and Exploration * Seismic geophysical surveys * Exploratory drilling using various.S. citizens engaged in a specific activity (other than commercial fishing) in a specified geographical region

308

Seismic Fracture Characterization Methods for Enhanced Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

5 4.5.2 Seismic Fracture Characterization Methods for Enhanced Geothermal Systems Presentation Number: 022 Investigator: Queen, John (Hi-Q Geophysical Inc.) Objectives: To develop...

309

Mapping Diffuse Seismicity for Geothermal Reservoir Management...  

Broader source: Energy.gov (indexed) [DOE]

Templeton David B. Harris Lawrence Livermore Natl. Lab. Seismicity and Reservoir Fracture Characterization May 18, 2010 This presentation does not contain any proprietary...

310

Hanford Sitewide Probabilistic Seismic Hazard Analysis  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

seismic events are typically shallow (for example blasts generated in mines, quarries, and roadcuts; volcanoes; atmospheric phenomena). In the crustal earthquake catalog...

311

Borehole Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

Borehole Seismic Techniques Borehole Seismic Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Borehole Seismic Techniques Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Borehole Seismic Techniques Parent Exploration Technique: Downhole Techniques Information Provided by Technique Lithology: Rock unit density influences elastic wave velocities Stratigraphic/Structural: Structural geology- faults, folds, grabens, horst blocks, sedimentary layering, discontinuities, etc Hydrological: Combining compressional and shear wave results can indicate the presence of fluid saturation in the formation Thermal: High temperatures and pressure impact the compressional and shear wave velocities

312

Category:Passive Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

has the following 2 subcategories, out of 2 total. M Micro-Earthquake 1 pages T Teleseismic-Seismic Monitoring 1 pages Pages in category "Passive Seismic...

313

Nonlinear seismic response analysis of steel-concrete composite frames  

E-Print Network [OSTI]

shear connection (Imperial Valley seismic input) Floor #site), and (ii) the 1979 Imperial Valley earthquake recordedFig. 12 relates to the Imperial Valley seismic input. Unless

Barbato, Michele

2008-01-01T23:59:59.000Z

314

Joint inversion of electrical and seismic data for Fracture char...  

Broader source: Energy.gov (indexed) [DOE]

Joint inversion of electrical and seismic data for Fracture char. and Imaging of Fluid Flow in Geothermal Systems Joint inversion of electrical and seismic data for Fracture char....

315

Vertical Seismic Profiling At Rye Patch Area (DOE GTP, 2011)...  

Open Energy Info (EERE)

Vertical Seismic Profiling At Rye Patch Area (DOE GTP, 2011) Exploration Activity Details Location Rye Patch Area Exploration Technique Vertical Seismic Profiling Activity Date...

316

Waste Inspection Tomography (WIT)  

SciTech Connect (OSTI)

Waste Inspection Tomography (WIT) provides mobile semi-trailer mounted nondestructive examination (NDE) and assay (NDA) for nuclear waste drum characterization. WIT uses various computed tomography (CT) methods for both NDE and NDA of nuclear waste drums. Low level waste (LLW), transuranic (TRU), and mixed radioactive waste can be inspected and characterized without opening the drums. With externally transmitted x-ray NDE techniques, WIT has the ability to identify high density waste materials like heavy metals, define drum contents in two- and three-dimensional space, quantify free liquid volumes through density and x-ray attenuation coefficient discrimination, and measure drum wall thickness. With waste emitting gamma-ray NDA techniques, WIT can locate gamma emitting radioactive sources in two- and three-dimensional space, identify gamma emitting isotopic species, identify the external activity levels of emitting gamma-ray sources, correct for waste matrix attenuation, provide internal activity approximations, and provide the data needed for waste classification as LLW or TRU. The mobile feature of WIT allows inspection technologies to be brought to the nuclear waste drum storage site without the need to relocate drums for safe, rapid, and cost-effective characterization of regulated nuclear waste. The combination of these WIT characterization modalities provides the inspector with an unprecedented ability to non-invasively characterize the regulated contents of waste drums as large as 110 gallons, weighing up to 1,600 pounds. Any objects that fit within these size and weight restrictions can also be inspected on WIT, such as smaller waste bags and drums that are five and thirty-five gallons.

Bernardi, R.T.

1995-12-01T23:59:59.000Z

317

Doppler disc tomography applied to low mass AGN spin  

E-Print Network [OSTI]

Doppler tomography can provide a powerful means of determining black hole spin when our view to the central regions are revealed and obscured by optically thick orbiting material, and can provide an independent estimate that does not suffer as many degeneracies as traditional methods. For low mass AGN, time-dependent obscuration is expected to leave a signature in the changing spectrum of the disc emission which extends into the soft X-ray bandpass. We create a spectral model incorporating Doppler tomography and apply it to the case of the low mass (8$\\times$10$^{5}$ M$_{\\odot}$) AGN, RX J1301.9+2747 which shows unusual timing properties in the form of short-lived flares that we argue are best explained by the orbit of a window through an optically thick wind. Modelling the phase-resolved spectrum over the course of the highest data quality flare indicates a very low spin even when we relax our constraints. This is the lowest mass AGN for which a spin has been measured and the first via this technique. We not...

Middleton, Matthew

2014-01-01T23:59:59.000Z

318

TIME-DEPENDENT MAXWELL'S EQUATIONS*  

E-Print Network [OSTI]

polynomials of degree at most i in xand at most jin y. Thus Q00 is ... ping from a given element K to K using the mapping F1. We use ...... IH(xi,t) Hh(xi,t)[2 i--1 at t.

319

Non-Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques  

Broader source: Energy.gov [DOE]

Non-Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques Justin Coleman, P.E. October 25th, 2011

320

Non-linear Seismic Soil Structure Interaction Method for Developing Nonlinear Seismic SSI  

Broader source: Energy.gov (indexed) [DOE]

Linear Seismic Soil Structure Interaction (SSI) Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques Justin Coleman, P.E. October 25th, 2011 E102003020BDS Presentation Outline  Purpose of Presentation  Linear versus Non-Linear Seismic SSI  Non-Linear seismic Soil Structure Interaction (NLSSI) Studies  The NLSSI Introduction  Non-Linearity in Seismic SSI Analysis  Commercial Software Elements  Commercial Software Non-Linear Constitutive Models  Non-Linear Seismic SSI Damping  Demonstration of Time Domain 2D Model  NLSSI Validation Approach  NLSSI Implementation  Need For NLSSI  Conclusions E102003020BDS Purpose of Presentation  The purpose of the presentation is to establish the need for using non-linear analysis

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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.


321

Seismic monitoring at The Geysers  

SciTech Connect (OSTI)

During the last several years Lawrence Berkeley Laboratory (LBL) and Lawrence Livermore National Laboratory (LLNL) have been working with industry partners at The Geysers geothermal field to evaluate and develop methods for applying the results of microearthquake (MEQ) monitoring. It is a well know fact that seismicity at The Geysers is a common occurrence, however, there have been many studies and papers written on the origin and significance of the seismicity. The attitude toward MEQ data ranges from being nothing more than an curious artifact of the production activities, to being a critical tool in evaluating the reservoir performance. The purpose of the work undertaken b y LBL and LLNL is to evaluate the utility, as well as the methods and procedures used in of MEQ monitoring, recommend the most cost effective implementation of the methods, and if possible link physical processes and parameters to the generation of MEQ activity. To address the objectives above the MEQ work can be categorized into two types of studies. The first type is the direct analysis of the spatial and temporal distribution of MEQ activity and studying the nature of the source function relative to the physical or chemical processes causing the seismicity. The second broad area of study is imaging the reservoir/geothermal areas with the energy created by the MEQ activity and inferring the physical and/or chemical properties within the zone of imaging. The two types of studies have obvious overlap, and for a complete evaluation and development require high quality data from arrays of multicomponent stations. Much of the effort to date at The Geysers by both DOE and the producers has concentrated establishing a high quality data base. It is only within the last several years that this data base is being fully evaluated for the proper and cost effective use of MEQ activity. Presented here are the results to date of DOE`s effort in the acquisition and analysis of the MEQ data.

Majer, E.L.; Romero, A.; Vasco, D.; Kirkpatrick, A.; Peterson, J.E. [Lawrence Berkeley Lab., CA (United States); Zucca, J.J.; Hutchings, L.J.; Kasameyer, P.W. [Lawrence Livermore National Lab., CA (United States)

1993-04-01T23:59:59.000Z

322

Newberry EGS Seismic Velocity Model  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

We use ambient noise correlation (ANC) to create a detailed image of the subsurface seismic velocity at the Newberry EGS site down to 5 km. We collected continuous data for the 22 stations in the Newberry network, together with 12 additional stations from the nearby CC, UO and UW networks. The data were instrument corrected, whitened and converted to single bit traces before cross correlation according to the methodology in Benson (2007). There are 231 unique paths connecting the 22 stations of the Newberry network. The additional networks extended that to 402 unique paths crossing beneath the Newberry site.

Dennise Templeton

323

Newberry EGS Seismic Velocity Model  

SciTech Connect (OSTI)

We use ambient noise correlation (ANC) to create a detailed image of the subsurface seismic velocity at the Newberry EGS site down to 5 km. We collected continuous data for the 22 stations in the Newberry network, together with 12 additional stations from the nearby CC, UO and UW networks. The data were instrument corrected, whitened and converted to single bit traces before cross correlation according to the methodology in Benson (2007). There are 231 unique paths connecting the 22 stations of the Newberry network. The additional networks extended that to 402 unique paths crossing beneath the Newberry site.

Dennise Templeton

2013-10-01T23:59:59.000Z

324

Seismicity in Azerbaijan and Adjacent Caspian Sea  

SciTech Connect (OSTI)

So far no general view on the geodynamic evolution of the Black Sea to the Caspian Sea region is elaborated. This is associated with the geological and structural complexities of the region revealed by geophysical, geochemical, petrologic, structural, and other studies. A clash of opinions on geodynamic conditions of the Caucasus region, sometimes mutually exclusive, can be explained by a simplified interpretation of the seismic data. In this paper I analyze available data on earthquake occurrences in Azerbaijan and the adjacent Caspian Sea region. The results of the analysis of macroseismic and instrumental data, seismic regime, and earthquake reoccurrence indicate that a level of seismicity in the region is moderate, and seismic event are concentrated in the shallow part of the lithosphere. Seismicity is mostly intra-plate, and spatial distribution of earthquake epicenters does not correlate with the plate boundaries.

Panahi, Behrouz M. [Geology Institute, Azerbaijan National Academy of Sciences, 29-A H. Javid Ave., Baku 1143 (Azerbaijan)

2006-03-23T23:59:59.000Z

325

Analytical study of the nonlinear Schroedinger equation with an arbitrary linear time-dependent potential in quasi-one-dimensional Bose-Einstein condensates  

SciTech Connect (OSTI)

Under investigation in this paper is a nonlinear Schroedinger equation with an arbitrary linear time-dependent potential, which governs the soliton dynamics in quasi-one-dimensional Bose-Einstein condensates (quasi-1DBECs). With Painleve analysis method performed to this model, its integrability is firstly examined. Then, the distinct treatments based on the truncated Painleve expansion, respectively, give the bilinear form and the Painleve-Baecklund transformation with a family of new exact solutions. Furthermore, via the computerized symbolic computation, a direct method is employed to easily and directly derive the exact analytical dark- and bright-solitonic solutions. At last, of physical and experimental interests, these solutions are graphically discussed so as to better understand the soliton dynamics in quasi-1DBECs.

Lue Xing [School of Science, P.O. Box 49, Beijing University of Posts and Telecommunications, Beijing 100876 (China)], E-mail: xinglv655@yahoo.com.cn; Tian Bo [School of Science, P.O. Box 49, Beijing University of Posts and Telecommunications, Beijing 100876 (China); State Key Laboratory of Software Development Environment, Beijing University of Aeronautics and Astronautics, Beijing 100083 (China); Key Laboratory of Optical Communication and Lightwave Technologies, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876 (China); Xu Tao; Cai Kejie; Liu Wenjun [School of Science, P.O. Box 49, Beijing University of Posts and Telecommunications, Beijing 100876 (China)

2008-10-15T23:59:59.000Z

326

Simulating Cl K-edge X-ray absorption spectroscopy in MCl62- (M= U, Np, Pu) complexes and UOCl5- using time-dependent density functional theory  

SciTech Connect (OSTI)

We report simulations of the X-ray absorption near edge structure (XANES) at the Cl K-edge of actinide hexahalides MCl62- (M = U, Np, Pu) and the UOCl5- complex using linear-response time-dependent density functional theory (LR-TDDFT) extended for core excitations. To the best of our knowledge, these are the first calculations of the Cl K-edge spectra of NpCl62- and PuCl62-. In addition, the spectra are simulated with and without the environmental effects of the host crystal as well as ab initio molecular dynamics (AIMD) to capture the dynamical effects due to atomic motion. The calculated spectra are compared with experimental results, where available and the observed trends are discussed.

Govind, Niranjan; De Jong, Wibe A.

2014-02-21T23:59:59.000Z

327

Time-dependent, three-dimensional fluid model of the outer coma, with application to the comet Hale-Bopp gas spirals  

Science Journals Connector (OSTI)

We describe here the first tridimensional, time-dependent model of a gas coma, and its first application to observed rotationally induced gas coma structures. The present version of the model uses inviscid flow equations and, because of it, is applicable rigorously only to highly productive comets, such as comet C1995/O1 Hale-Bopp in the inner Solar System. Using parameters suitable for this comet, and an arbitrary aspherical nucleus shape and rotation mode, the model is capable to generate large-scale gas spirals of the kind observed in this comet, thus demonstrating that the existence of such spirals does not require surface heterogeneity (active/inactive areas). This result does not in itself exclude heterogeneity. The question whether, in the absence of direct nucleus observations, any reliable interpretation of such structures is possible is raised.

A.V. Rodionov; J.-F. Crifo

2006-01-01T23:59:59.000Z

328

AN ENERGY-CONSERVING, PARTICLE-DOMINATED, TIME-DEPENDENT MODEL OF 3C 58 AND ITS OBSERVABILITY AT HIGH ENERGIES  

SciTech Connect (OSTI)

We present a time-dependent spectral model of the nebula 3C 58 and compare it with available data. The model is for a leptonic nebula in which particles are subject to synchrotron, inverse Compton, self-synchrotron Compton, adiabatic, and bremsstrahlung processes. We find that 3C 58 is compatible with being a particle-dominated nebula, with a magnetic field of 35 {mu}G. A broken power-law injection fits well the multi-frequency data, with a break energy at about 40 GeV. We find that 3C 58 is not expected to appear in VERITAS or MAGIC II, unless the local IR background is a factor of {approx}20 off Galactic models' averages. For cases in which the cosmic microwave background dominates the inverse Compton contribution, we find that 3C 58 will not be visible either for the Cherenkov Telescope Array.

Torres, Diego F.; Martin Rodriguez, Jonatan [Institute of Space Sciences (IEEC-CSIC), Campus UAB, Torre C5, 2a planta, E-08193 Barcelona (Spain); Cillis, Analia N. [Instituto de Astronomia y Fisica del Espacio, Casilla de Correo 67-Suc. 28 (C1428ZAA), Buenos Aires (Argentina)

2013-01-20T23:59:59.000Z

329

Observation of pi - B meson charge-flavor correlations and measurement of time dependent B{sup 0}Bbar{sup 0} mixing in p pbar collisions  

SciTech Connect (OSTI)

We present a study of time dependent B{sup 0}-{anti B}{sup 0} mixing in p{anti p} collisions at 1.8 TeV using 110 pb{sup -1} collected with the CDF detector at the Fermilab Tevatron Collider. B mesons are partially reconstructed using the semileptonic decays B{sup 0}{yields}l{sup +}D{sup (*)-}X and B{sup +}{yields}l{sup +}{anti D}{sup 0}X (and their charge conjugates). B meson-charged pion correlations are used in order to determine the flavor of the B meson at t=0. Such correlations are expected to arise from pions produced in the fragmentation chain and also from B{sup **} decays. We measure the efficiency and purity of this flavor tagging method for both charged and neutral B mesons.

P. Maksimovic

1999-01-26T23:59:59.000Z

330

Equivalence of Maxwell's source-free equations to the time-dependent Schroedinger equation for a solitary particle with two polarizations and Hamiltonian |cp|  

E-Print Network [OSTI]

It was pointed out in a previous paper that although neither the Klein-Gordon equation nor the Dirac Hamiltonian produces sound solitary free-particle relativistic quantum mechanics, the natural square-root relativistic Hamiltonian for a nonzero-mass free particle does achieve this. Failures of the Klein-Gordon and Dirac theories are reviewed: the solitary Dirac free particle has, inter alia, an invariant speed well in excess of c and staggering spontaneous Compton acceleration, but no pathologies whatsoever arise from the square-root relativistic Hamiltonian. Dirac's key misapprehension of the underlying four-vector character of the time-dependent, configuration-representation Schroedinger equation for a solitary particle is laid bare, as is the invalidity of the standard "proof" that the nonrelativistic limit of the Dirac equation is the Pauli equation. Lorentz boosts from the particle rest frame point uniquely to the square-root Hamiltonian, but these don't exist for a massless particle. Instead, Maxwell's equations are dissected in spatial Fourier transform to separate nondynamical longitudinal from dynamical transverse field degrees of freedom. Upon their decoupling in the absence of sources, the transverse field components are seen to obey two identical time-dependent Schroedinger equations (owing to two linear polarizations), which have the massless free-particle diagonalized square-root Hamiltonian. Those fields are readily modified to conform to the attributes of solitary-photon wave functions. The wave functions' relations to the potentials in radiation gauge are also worked out. The exercise is then repeated without the considerable benefit of the spatial Fourier transform.

Steven Kenneth Kauffmann

2010-04-11T23:59:59.000Z

331

Study of calculated and measured time dependent delayed neutron yields. [TX, for calculating delayed neutron yields; MATINV, for matrix inversion; in FORTRAN for LSI-II minicomputer  

SciTech Connect (OSTI)

Time-dependent delayed neutron emission is of interest in reactor design, reactor dynamics, and nuclear physics studies. The delayed neutrons from neutron-induced fission of /sup 232/U, /sup 237/Np, /sup 238/Pu, /sup 241/Am, /sup 242m/Am, /sup 245/Cm, and /sup 249/Cf were studied for the first time. The delayed neutron emission from /sup 232/Th, /sup 233/U, /sup 235/U, /sup 238/U, /sup 239/Pu, /sup 241/Pu, and /sup 242/Pu were measured as well. The data were used to develop an empirical expression for the total delayed neutron yield. The expression gives accurate results for a large variety of nuclides from /sup 232/Th to /sup 252/Cf. The data measuring the decay of delayed neutrons with time were used to derive another empirical expression predicting the delayed neutron emission with time. It was found that nuclides with similar mass-to-charge ratios have similar decay patterns. Thus the relative decay pattern of one nuclide can be established by any measured nuclide with a similar mass-to-charge ratio. A simple fission product yield model was developed and applied to delayed neutron precursors. It accurately predicts observed yield and decay characteristics. In conclusion, it is possible to not only estimate the total delayed neutron yield for a given nuclide but the time-dependent nature of the delayed neutrons as well. Reactors utilizing recycled fuel or burning actinides are likely to have inventories of fissioning nuclides that have not been studied until now. The delayed neutrons from these nuclides can now be incorporated so that their influence on the stability and control of reactors can be delineated. 8 figures, 39 tables.

Waldo, R.W.

1980-05-01T23:59:59.000Z

332

Three-Dimensional Seismic Imaging of the Ryepatch Geothermal Reservoir  

E-Print Network [OSTI]

hydrothermal al- teration would combine to reduce the effectiveness of standard 3-D seismic processing.

Feighner, Mark A.

2010-01-01T23:59:59.000Z

333

A continuation approach to regularization for traveltime tomography  

SciTech Connect (OSTI)

In most geometries in which seismic traveltime tomography is applied the slowness field is not well-determined from traveltimes alone. Nonuniqueness is common. Even when the slowness field is uniquely determined, small changes in the measured traveltimes can lead to large errors in the computed slowness field. A priori information is often available--well-logs, initial rough estimates of the slowness from structural geology, etc. This a priori information can be incorporated into a traveltime inversion algorithm using penalty terms. To further regularize the problem, smoothing constrains can also be incorporated using penalty terms by penalizing derivatives of the slowness field. A major decision to be made is the selection of the weights on the penalty terms, particularly the smoothing penalty weights. The authors use a continuation approach for selecting the smoothing penalty weights. Instead of fixing the smoothing penalty weights, they decrease the smoothing penalty weights in a step-by-step fashion, using the slowness model computed using the previous (larger) weights as the initial slowness model for the next step using the new (smaller) weights. A surprising outcome in synthetic problems is that the model error continues to decrease as they continue to decrease the smoothing penalty weights even after the data error had leveled off at the noise level. This continuation approach can solve synthetic problems more accurately than with fixed smoothing penalty weights, and appears to yield more features of interest in real-data applications of traveltime tomography.

Bube, K.P. [Univ. of Washington, Seattle, WA (United States); Langan, R.T. [Chevron Petroleum Technology, La Habra, CA (United States)

1994-12-31T23:59:59.000Z

334

Very-high-order harmonic generation from Ar atoms and Ar+ ions in superintense pulsed laser fields: An ab initio self-interaction-free time-dependent density-functional approach  

E-Print Network [OSTI]

We present an ab initio nonpertubative investigation of the mechanisms responsible for the production of very-high-order harmonic generation (HHG) from Ar atoms and Ar+ ions by means of the self-interaction-free time-dependent density...

Carrera, Juan J.; Chu, Shih-I; Tong, X. M.

2005-06-21T23:59:59.000Z

335

The effect of seismic waves on earthquake nucleation and fault strength  

E-Print Network [OSTI]

Great Earthquakes and Global Seismic Networks, Seismologicaland D. C. Agnew (2006), Seismic waves increase permeability,Great Earthquakes and Global Seismic Networks, Seismological

van der Elst, Nicholas

2012-01-01T23:59:59.000Z

336

Seismic Performance of Reinforced Concrete Bridges Allowed to Uplift During Multi-Directional Excitation  

E-Print Network [OSTI]

Abghari, A. (1999). “Seismic Soil-Pile Structure InteractionNo. 9. Caltrans (2004). Seismic Design Criteria, Versionand Mander, J. (1994). Seismic energy-based fatigue damage

Espinoza, Andres Oscar

2011-01-01T23:59:59.000Z

337

Seismic Performance, Modeling, and Failure Assessment of Reinforced Concrete Shear Wall Buildings  

E-Print Network [OSTI]

T. Y. , and Moehle, J.P. , “Seismic safety evaluation of theEffective Stiffness for Seismic Analysis,” ACI Journal ofResearch/ California seismic safety commission, The

Tuna, Zeynep

2012-01-01T23:59:59.000Z

338

Seismic bridge response modification due to degradation of viscous dampers performance  

E-Print Network [OSTI]

Soong, & Mahamoodi. (1989). Seismic responce of steel frameUMCE 01/1987). Elastic seismic response of buildings withanalytical investigation of seismic response of structures

Graziotti, Francesco

2010-01-01T23:59:59.000Z

339

Borehole Seismic Monitoring at Otway Using the Naylor-1 Instrument String  

E-Print Network [OSTI]

LBNL-2337E Borehole Seismic Monitoring at Otway Using thefor performing three distinct seismic measurements, hightime (HRTT), walkaway vertical seismic profiling (WVSP), and

Daley, T.M.

2010-01-01T23:59:59.000Z

340

The Seismic response of precast segmental bridge superstructures with bonded tendons  

E-Print Network [OSTI]

31 2.4. Current Seismic Design Practice inS.H. , and Seible, F. , “Seismic Performance of Precastand Commentary for the Seismic Rehabilitation of Buildings”,

Veletzos, Marc John

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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.


341

Seismic and Acoustic Investigations of Rock Fall Initiation, Processes, and Mechanics  

E-Print Network [OSTI]

and  Senfaute  G.  (2005).  Seismic  precursory  patterns  F.    (2010).    The  seismic  signature  of  rockslides:  statistical  analysis  of  seismic  signals.  Journal  of  

Zimmer, Valerie Louise

2011-01-01T23:59:59.000Z

342

Resistivity Tomography | Open Energy Information  

Open Energy Info (EERE)

Resistivity Tomography Resistivity Tomography Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Resistivity Tomography Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Resistivity Log Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Cost Information Low-End Estimate (USD): 60.986,098 centUSD 0.061 kUSD 6.098e-5 MUSD 6.098e-8 TUSD / foot Median Estimate (USD): 76.227,622 centUSD 0.0762 kUSD 7.622e-5 MUSD 7.622e-8 TUSD / foot High-End Estimate (USD): 106.7110,671 centUSD 0.107 kUSD 1.0671e-4 MUSD 1.0671e-7 TUSD / foot Time Required Low-End Estimate: 1 days0.00274 years

343

TE Connectivity Finds Answers in Tomography  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

TE Connectivity Finds Answers in Tomography TE Connectivity Finds Answers in Tomography Print Thursday, 22 August 2013 10:50 TE Connectivity is a world leader in connectivity-the...

344

Hanford Sitewide Probabilistic Seismic Hazard Analysis  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

4.4). In support of this model, Pratt (2012) presented a depth-migrated seismic reflection profile across the Saddle Mountain anticline with the interpretation of a moderately...

345

Study of induced seismicity for reservoir characterization  

E-Print Network [OSTI]

The main goal of the thesis is to characterize the attributes of conventional and unconventional reservoirs through passive seismicity. The dissertation is comprised of the development and applications of three new methods, ...

Li, Junlun, Ph. D. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

346

4-D seismic technologies: intersurvey calibration  

E-Print Network [OSTI]

seismic data sets at different times in the production life of a reservoir, calibrating, then comparing the data sets and interpreting intersurvey differences in terms of fluid change or movement. In practice 4-D (time-lapse) analysis is typically...

Kelley, Jeffrey Paul

2012-06-07T23:59:59.000Z

347

The evolution of shallow seismic exploration methods  

E-Print Network [OSTI]

Near-surface seismic methods have developed considerably and have been applied much more widely since the 1970s. Improvements in instrumentation, along with cheaper computer power, have greatly affected the capabilities of these methods in recent...

Steeples, Don W.; Schmeissner, Chris M.; Macy, Brian

1995-07-01T23:59:59.000Z

348

Seismic assessment strategies for masonry structures  

E-Print Network [OSTI]

Masonry structures are vulnerable to earthquakes, but their seismic assessment remains a challenge. This dissertation develops and improves several strategies to better understand the behavior of masonry structures under ...

DeJong, Matthew J. (Matthew Justin)

2009-01-01T23:59:59.000Z

349

Estimating Oceanic Turbulence Dissipation from Seismic Images  

Science Journals Connector (OSTI)

Seismic images of oceanic thermohaline finestructure record vertical displacements from internal waves and turbulence over large sections at unprecedented horizontal resolution. Where reflections follow isopycnals, their displacements can be used ...

W. Steven Holbrook; Ilker Fer; Raymond W. Schmitt; Daniel Lizarralde; Jody M. Klymak; L. Cody Helfrich; Robert Kubichek

2013-08-01T23:59:59.000Z

350

Stormwater Pollution Prevention Plan Seismic Phase II  

E-Print Network [OSTI]

Stormwater Pollution Prevention Plan Seismic Phase II Prepared by: Environment, Health and Safety Division Environmental Services Group May 2010 Revision 1 Ernest Orlando Lawrence Berkeley National ..................................................................................................................... 15 2.1.1 Demolition of Building 25/25B

351

Probabilistic seismic hazard maps for Panama  

Science Journals Connector (OSTI)

Probabilistic seismic hazard maps in term of Modified Mercalli (MM) intensity are derived by applying the ‘Cornell-McGuire’ method to four earthquake source zones in Panama and adjacent areas. The maps contain es...

Aristoteles Vergara Muñoz

1991-01-01T23:59:59.000Z

352

Reservoir fracture characterizations from seismic scattered waves  

E-Print Network [OSTI]

The measurements of fracture parameters, such as fracture orientation, fracture density and fracture compliance, in a reservoir is very important for field development and exploration. Traditional seismic methods for ...

Fang, Xinding

2012-01-01T23:59:59.000Z

353

Self-Guided Quantum Tomography  

Science Journals Connector (OSTI)

We introduce a self-learning tomographic technique in which the experiment guides itself to an estimate of its own state. Self-guided quantum tomography uses measurements to directly test hypotheses in an iterative algorithm which converges to the true state. We demonstrate through simulation on many qubits that Self-guided quantum tomography is a more efficient and robust alternative to the usual paradigm of taking a large amount of informationally complete data and solving the inverse problem of postprocessed state estimation.

Christopher Ferrie

2014-11-07T23:59:59.000Z

354

Fluid driven torsional dipole seismic source  

DOE Patents [OSTI]

A compressible fluid powered oscillating downhole seismic source device capable of periodically generating uncontaminated horizontally-propagated, shear waves is provided. A compressible fluid generated oscillation is created within the device which imparts an oscillation to a housing when the device is installed in a housing such as the cylinder off an existing downhole tool, thereby a torsional seismic source is established. Horizontal waves are transferred to the surrounding bore hole medium through downhole clamping.

Hardee, Harry C. (Albuquerque, NM)

1991-01-01T23:59:59.000Z

355

Discrete Tomography: A Neural Network Approach  

E-Print Network [OSTI]

Abstract Tomography tries to reconstruct an object from a number of projections in multiple directions quality reconstructions from a limited set of projections, while avoiding image artifacts that are often present in traditional approaches. 1 Introduction Tomography, or more especially computed tomography

Kosters, Walter

356

Blind seismic deconvolution using variational Bayesian method  

Science Journals Connector (OSTI)

Abstract Blind seismic deconvolution, which comprises seismic wavelet and reflectivity sequence, is a strongly ill-posed problem. The reflectivity sequence is modeled as a Bernoulli–Gaussian (BG) process, depending on four parameters (noise variance, high and low reflector variances, and reflector density). These parameters need to be estimated from the seismic record, which is the convolution of the reflectivity sequence and the seismic wavelet. In this paper, we propose a variational Bayesian method for blind seismic deconvolution which can determine the reflectivity sequence and the seismic wavelet. The connection between variational Bayesian blind deconvolution and the minimization of the Kullback–Leibler divergence of two probability distributions is also established. The gamma, beta distributions are used for the unknown parameters (hyperparameters) as prior distribution and also we give how these distributions can be inferred in actual situations. The proposed algorithms are tested by simulation and compared to existing blind deconvolution methods. The results show that variational Bayesian method has better agreement with the actual value.

Li Yanqin; Zhang Guoshan

2014-01-01T23:59:59.000Z

357

Testing to determine relay seismic ruggedness  

Science Journals Connector (OSTI)

The seismic qualification of equipment in operating nuclear plants has been identified as a potential safety concern in U.S. Nuclear Regulatory Commission (USNRC) Unresolved Safety Issue (USI) A-46, “Seismic Qualification of Equipment in Operating Nuclear Power Plants”. In response to this concern, the Seismic Qualification Utility Group (SQUG), with support from the Electric Power Research Institute (EPRI), has undertaken a program to demonstrate the seismic adequacy of essential equipment by the use of actual experience with such equipment in plants which have undergone significant earthquakes and by the use of available test data for similar equipment. An important part of this program is the development of the methodology and test data for verifying the functionality of electrical relays used in essential circuits needed for plant shutdown during a seismic event. This paper describes the EPRI supported relay testing program to supplement existing relay test data. Many old relays which are used in safe shutdown systems of SQUG plants and for which seismic test data do not exist have been shake-table tested. The testing performed on these relays and the test results for two groups of relays are summarized in this paper.

K.L. Merz; M.P. Wade; Jess Betlack

1990-01-01T23:59:59.000Z

358

Assignment of near-edge x-ray absorption fine structure spectra of metalloporphyrins by means of time-dependent density-functional calculations  

SciTech Connect (OSTI)

The C 1s and N 1s near-edge x-ray absorption fine structure (NEXAFS) spectra of three prototype tetraphenyl porphyrin (TPP) molecules are discussed in the framework of a combined experimental and theoretical study. We employ time-dependent density-functional theory (TDDFT) to compute the NEXAFS spectra of the open- and closed-shell metalloporphyrins CoTPP and ZnTPP as well as the free-base 2HTPP in realistic nonplanar conformations. Using Becke's well-known half-and-half hybrid functional, the computed core excitation spectra are mostly in good agreement with the experimental data in the low-energy region below the appropriate ionization threshold. To make these calculations feasible, we apply a new, simple scheme based on TDDFT using a modified single-particle input spectrum. This scheme is very easy to implement in standard codes and allows one to compute core excitation spectra at a similar cost as ordinary UV/vis spectra even for larger molecules. We employ these calculations for a detailed assignment of the NEXAFS spectra including subtle shifts in certain peaks of the N 1s spectra, which depend on the central coordination of the TPP ligand. We furthermore assign the observed NEXAFS resonances to the individual molecular subunits of the investigated TPP molecules.

Schmidt, Norman; Fink, Rainer [Department Chemie und Pharmazie, Lehrstuhl fuer Physikalische Chemie II and ICMM, Universitaet Erlangen-Nuernberg, Egerlandstrasse 3, 91058 Erlangen (Germany); Hieringer, Wolfgang [Department Chemie und Pharmazie, Lehrstuhl fuer Theoretische Chemie, Universitaet Erlangen-Nuernberg, Egerlandstrasse 3, 91058 Erlangen (Germany)

2010-08-07T23:59:59.000Z

359

Category:Borehole Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

Borehole Seismic Techniques page? Borehole Seismic Techniques page? For detailed information on Borehole Seismic Techniques as exploration techniques, click here. Category:Borehole Seismic Techniques Add.png Add a new Borehole Seismic Techniques Technique Pages in category "Borehole Seismic Techniques" The following 2 pages are in this category, out of 2 total. S Single-Well And Cross-Well Seismic V Vertical Seismic Profiling Retrieved from "http://en.openei.org/w/index.php?title=Category:Borehole_Seismic_Techniques&oldid=601962" Category: Downhole Techniques What links here Related changes Special pages Printable version Permanent link Browse properties About us Disclaimers Energy blogs Linked Data Developer services OpenEI partners with a broad range of international organizations to grow

360

Computed tomography:the details.  

SciTech Connect (OSTI)

Computed Tomography (CT) is a well established technique, particularly in medical imaging, but also applied in Synthetic Aperture Radar (SAR) imaging. Basic CT imaging via back-projection is treated in many texts, but often with insufficient detail to appreciate subtleties such as the role of non-uniform sampling densities. Herein are given some details often neglected in many texts.

Doerry, Armin Walter

2007-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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.


361

Seismic Line Location Map Hot Pot Project, Humboldt County, Nevada 2010  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Location of seismic lines carried out under DOE funded project Advanced Seismic Data Analysis Program (The Hot Pot Project).

Lane, Michael

362

Seismic Line Location Map Hot Pot Project, Humboldt County, Nevada 2010  

SciTech Connect (OSTI)

Location of seismic lines carried out under DOE funded project Advanced Seismic Data Analysis Program (The Hot Pot Project).

Michael Lane

2012-01-01T23:59:59.000Z

363

Time-dependent restricted-active-space self-consistent-field theory for laser-driven many-electron dynamics. II. Extended formulation and numerical analysis  

E-Print Network [OSTI]

The time-dependent restricted-active-space self-consistent-field (TD-RASSCF) method is formulated based on the TD variational principle. In analogy with the configuration-interaction singles (CIS), singles-and-doubles (CISD), singles-doubles-and-triples (CISDT) methods in quantum chemistry, the TD-RASSCF-S, -SD, and -SDT methods are introduced as extensions of the TD-RASSCF dou- bles (-D) method [Phys. Rev. A 87, 062511 (2013)]. Based on an analysis of the numerical cost and test calculations for one-dimensional (1D) models of atomic helium, beryllium, and carbon, it is shown that the TD-RASSCF-S and -D methods are computationally feasible for systems with many electrons and more accurate than the TD Hartree-Fock (TDHF) and TDCIS methods. In addition to the discussion of methodology, an analysis of electron dynamics in the high-order harmonic generation (HHG) process is presented. For the 1D beryllium atom, a state-resolved analysis of the HHG spectrum based on the time-independent HF orbitals shows that while only single-orbital excitations are needed in the region below the cutoff, single- and double-orbital excitations are es- sential beyond, where accordingly the single-active-electron (SAE) approximation and the TDCIS method break down. On the other hand, the TD-RASSCF-S and -D methods accurately describe the multi-orbital excitation processes throughout the entire region of the HHG spectrum. For the 1D carbon atom, our calculations show that multi-orbital excitations are essential in the HHG process even below the cutoff. Hence, in this test system a very accurate treatment of electron correlation is required. The TD-RASSCF-S and -D approaches meet this demand, while the SAE approximation and the TDCIS method are inadequate.

Haruhide Miyagi; Lars Bojer Madsen

2014-05-21T23:59:59.000Z

364

Hostile wells: the borehole seismic challenge | Open Energy Information  

Open Energy Info (EERE)

Hostile wells: the borehole seismic challenge Hostile wells: the borehole seismic challenge Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Hostile wells: the borehole seismic challenge Author William Wills Published Oil and Gas Engineer - Subsea & Seismic, 2013 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Hostile wells: the borehole seismic challenge Citation William Wills. Hostile wells: the borehole seismic challenge [Internet]. 2013. Oil and Gas Engineer - Subsea & Seismic. [cited 2013/10/01]. Available from: http://www.engineerlive.com/content/22907 Retrieved from "http://en.openei.org/w/index.php?title=Hostile_wells:_the_borehole_seismic_challenge&oldid=690045" Categories: References Geothermal References

365

S E R I E S SEISMIC ENGINEERING RESEARCH INFRASTRUCTURES  

E-Print Network [OSTI]

civilization documentary, economic, social and even political or spiritual value #12;SEISMIC ENGINEERINGS E R I E S SEISMIC ENGINEERING RESEARCH INFRASTRUCTURES FOR EUROPEAN SYNERGIES COMMISSION of Research Infrastructures in Performance-based Earthquake Engineering Shaking table testing of models

366

Time-lapse seismic monitoring of subsurface fluid flow  

E-Print Network [OSTI]

Time-lapse seismic monitoring repeats 3 D seismic imaging over a reservoir to map fluid movements in a reservoir. During hydrocarbon production, the fluid saturation, pressure, and temperature of a reservoir change, thereby altering the acoustic...

Yuh, Sung H.

2004-09-30T23:59:59.000Z

367

Seismic Fragility Analysis and Loss Estimation for Concrete Structures  

E-Print Network [OSTI]

The main objective of this study is to develop a methodology to assess seismic vulnerability of concrete structures and to estimate direct losses related to structural damage due to future seismic events. This dissertation contains several...

Bai, Jong Wha

2012-02-14T23:59:59.000Z

368

Annual Hanford Seismic Report for Fiscal Year 2004  

SciTech Connect (OSTI)

This report describes seismic activity at and around the Hanford Site during Fiscal Year 2004. It is also the first description of seismic activity during the fourth quarter of FY04.

Hartshorn, Donald C.; Reidel, Steve P.; Rohay, Alan C.

2004-12-07T23:59:59.000Z

369

Seismic Mapping Of The Subsurface Structure At The Ryepatch Geothermal...  

Open Energy Info (EERE)

In 1998 a 3-D surface seismic survey was conducted to explore the structure of the Rye Patch geothermal reservoir (Nevada) to determine if modern seismic techniques could be...

370

Three dimensional seismic imaging of the Rye Patch geothermal...  

Open Energy Info (EERE)

seismic imaging of the Rye Patch geothermal reservoir Jump to: navigation, search OpenEI Reference LibraryAdd to library Report: Three dimensional seismic imaging of the Rye Patch...

371

Non-linear traveltime inversion for 3-D seismic tomography in strongly anisotropic media  

Science Journals Connector (OSTI)

......low velocity body (Shale 2) and produces many...of the non-linear anisotropic inversion, we obtained...high velocity body (Shale 1) and fails to indicate...low velocity block (Shale 2). By contrast...of the non-linear anisotropic inversion yields clear......

Bing Zhou; Stewart Greenhalgh

2008-01-01T23:59:59.000Z

372

Seismic tomography constraints on reconstructing the Philippine Sea Plate and its margin  

E-Print Network [OSTI]

The Philippine Sea Plate has been surrounded by subduction zones throughout Cenozoic time due to the convergence of the Eurasian, Pacific and Indian-Australian plates. Existing Philippine Sea Plate reconstructions have been made based primarily...

Handayani, Lina

2005-02-17T23:59:59.000Z

373

Irregular grids in seismic tomography and minimum-time ray tracing  

Science Journals Connector (OSTI)

......information carried by each ray to the inversion process is a row of matrix A in system (1...priori information) to the inversion process. The lateral gradient in the second layer...using graph theory, 59th Ann. Int. Mtg, SOC. Expl. Geophys., Expanded Abstracts......

Aldo L. Vesnaver

1996-07-01T23:59:59.000Z

374

Statistical separation strategy to analyze velocity structure obtained by seismic tomography  

Science Journals Connector (OSTI)

...statistics ( x-nodes) (James and Roos, 1975; Brun and Rademakers, 1997), we were able to use the fitting parameters, mean...Research (Solid Earth) , 108 , 2358-2372.. Brun, R. , and Rademakers, F., 1997, ROOT-An object oriented data analysis framework...

Wolfgang Weinzierl; Heidrun Kopp

375

Seismic tomography of the southern California crust based on spectral-element and adjoint methods  

Science Journals Connector (OSTI)

......Valley, just south of the Coso geothermal region (e.g. Hauksson Unruh...would have a computational cost that is comparable to the tomographic...Regional tectonics of the Coso geothermal area along the intracontinental...Kanamori H. , 1977. The energy release in great earthquakes......

Carl Tape; Qinya Liu; Alessia Maggi; Jeroen Tromp

2010-01-01T23:59:59.000Z

376

Mapping brittle fracture zones in three dimensions: high resolution traveltime seismic tomography in a granitic pluton  

Science Journals Connector (OSTI)

......Company's Uranium mine restoration programme (ENRESA...studying the resolving power of a broad variety of...to study its resolving power we have performed several...Carmichael R.S. , 1982. Handbook of Physical Properties...prediction of the fracture system in the Albal granitic......

D. Martí; R. Carbonell; A. Tryggvason; J. Escuder; A. Pérez-Estaún

2002-04-01T23:59:59.000Z

377

First Quarter Seismic Report for Fiscal Year 2006  

SciTech Connect (OSTI)

This report describes the earthquake data collected from October 2005 to December 2005 from the Hanford Seismic Network

Rohay, Alan C.; Reidel, Stephen P.; Hartshorn, Donald C.; Sweeney, Mark D.; Clayton, Ray E.

2006-09-01T23:59:59.000Z

378

The Seismic Stratigraphy and Sedimentation along the Ninetyeast Ridge  

E-Print Network [OSTI]

examines the stratigraphy and sediment thickness on the ridge using new seismic data to describe the sedimentary history of NER. More than 3700 km of 2D multichannel seismic reflection profiles were collected along NER at seven sites between 5.5? N............................................................................ 28 Figure 2 Seismic Survey Map of KNOX06RR Site 758 .................................. 29 Figure 3 Total Sediment Thickness Isopach Map of KNOX06RR Site 758 .... 30 Figure 4 Seismic Reflection Profile from KNOX06RR Site 758 .................... 31...

Eisin, Amy Elizabeth

2010-10-12T23:59:59.000Z

379

Seismic constraints on open clusters  

E-Print Network [OSTI]

We derive knowledge on the global and structural parameters of low-mass stars using asteroseismology and taking advantage of the stellar collective behavior within open clusters. We build stellar models and compute the seismic signal expected from main sequence objects in the 0.8-1.6 Msun range. We first evaluate apparent magnitudes and oscillations-induced luminosity fluctuations expected in the Hyades, the Pleiades and the alpha Persei clusters. The closest cluster presents a feasible challenge to observational asteroseismology in the present and near future. We combine seismological and classical computations to address three questions: what can be inferred about 1) mass, 2) composition and 3) extension of outer convection zones of solar analogs in the Hyades. The first issue relies on the strong sensitivity of the large separation to mass. Then large separations and second differences are used to respectively constrain metal and helium fractions in the Hyades.When plotted for several masses, the relation of effective temperature vs large separation is found to be strongly dependent on the metal content. Besides this the second difference main modulation is related to the second ionization of helium.The second difference modulations are also partly due to the discontinuity in stellar stratification at the convective envelope / radiative core transition. They permit direct insight in the stellar structure. We compute acoustic radii of the convective bases for different values of the mixing length theoryparameter alpha_MLT in convection modelling, i.e. different convective efficiency in the superadiabatic layers. For a given effectivetemperature we show that the acoustic radius changes with convection efficiency.

L. Piau; J. Ballot; S. Turck-Chieze

2005-03-07T23:59:59.000Z

380

Tutorial on seismic interferometry: Part 1 --Basic principles and applications  

E-Print Network [OSTI]

Tutorial on seismic interferometry: Part 1 -- Basic principles and applications Kees Wapenaar1 , Deyan Draganov1 , Roel Snieder2 , Xander Campman3 , and Arie Verdel3 ABSTRACT Seismic interferometry is the retrieval of seismic surface-wave responses from ambient noise and the subsequent tomographic determination

Snieder, Roel

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Exposure to seismic survey alters blue whale acoustic communication  

Science Journals Connector (OSTI)

...research-article Animal behaviour 1001 14 Exposure to seismic survey alters blue whale acoustic communication...their natural functions. Sounds from seismic surveys are intense and have peak frequency...changed their vocal behaviour during a seismic survey that deployed a low-medium power...

2010-01-01T23:59:59.000Z

382

Continuous Seismic Reflexion Profiles in the Red Sea  

Science Journals Connector (OSTI)

...October 1970 research-article Continuous Seismic Reflexion Profiles in the Red Sea J. D. Phillips D. A. Ross Twenty continuous seismic reflexion profiles have been made across...in the deeper axial trough. A strong seismic reflector is observed at depths up to...

1970-01-01T23:59:59.000Z

383

Seismic petrophysics: An applied science for reservoir geophysics  

E-Print Network [OSTI]

Seismic petrophysics: An applied science for reservoir geophysics WAYNE D. PENNINGTON, Michigan a number of seismic attributes, using either prestack or poststack data, or even both in combination's intuition and, per- haps, wishful thinking, as a guide. This short paper introduces a new term "seismic

384

Three-dimensional seismic imaging of a dymanic Earth  

Science Journals Connector (OSTI)

...M. T. Thompson Three-dimensional seismic imaging of a dymanic Earth Lidia Lonergan...UK ( nwhite@esc.cam.ac.uk ) Seismic imaging is the most important tool used...and application of three-dimensional seismic reflection technology. Routinely used...

1999-01-01T23:59:59.000Z

385

Seismic Refraction Shooting in an Area of the Eastern Atlantic  

Science Journals Connector (OSTI)

17 June 1952 research-article Seismic Refraction Shooting in an Area of the...described in this paper a new method of seismic refraction shooting was developed. With...1952002328 Interpretation of results of seismic refraction shooting carried out in the...

1952-01-01T23:59:59.000Z

386

DEMONSTRATION OF NONLINEAR SEISMIC SOIL STRUCTURE INTERACTION AND APPLICABILITY TO NEW SYSTEM FRAGILITY CURVES SEISMIC  

SciTech Connect (OSTI)

Risk calculations should focus on providing best estimate results, and associated insights, for evaluation and decision-making. Specifically, seismic probabilistic risk assessments (SPRAs) are intended to provide best estimates of the various combinations of structural and equipment failures that can lead to a seismic induced core damage event. However, in general this approach has been conservative, and potentially masks other important events (for instance, it wasn’t the seismic motions that caused the Fukushima core melt events, but the tsunami ingress into the facility).

Coleman, Justin [Idaho National Laboratory

2014-09-01T23:59:59.000Z

387

Decision analysis for seismic retrofit of structures  

E-Print Network [OSTI]

aa a dG S fS GS dS ?? =? ? ?? ?? . (2.3) Annualized seismic hazard exceedance curves containing discrete values of () a GS for locations throughout the United States are available from the United States Geological Survey (USGS). These curves.... Applying the method of integration of seismic vulnerability and hazard, EAL can be defined as ()() 0 a aaa S EAL V y S v S dS ? = = ? (3.1) 14 where V denotes the replacement value of a building, the random variable () a yS is the total damage...

Williams, Ryan J.

2009-05-15T23:59:59.000Z

388

Advanced motor driven clamped borehole seismic receiver  

DOE Patents [OSTI]

A borehole seismic tool including a borehole clamp which only moves perpendicular to the borehole. The clamp is driven by an electric motor, via a right angle drive. When used as a seismic receiver, the tool has a three part housing, two of which are hermetically sealed. Accelerometers or geophones are mounted in one hermetically sealed part, the electric meter in the other hermetically sealed part, and the clamp and right angle drive in the third part. Preferably the tool includes cable connectors at both ends. Optionally a shear plate can be added to the clamp to extend the range of the tool.

Engler, Bruce P. (Sandoval County, NM); Sleefe, Gerard E. (Bernalillo County, NM); Striker, Richard P. (Bernalillo County, NM)

1993-01-01T23:59:59.000Z

389

Down-hole periodic seismic generator  

DOE Patents [OSTI]

A down hole periodic seismic generator system is disclosed for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.

Hardee, H.C.; Hills, R.G.; Striker, R.P.

1982-10-28T23:59:59.000Z

390

Seismic Crystals And Earthquake Shield Application  

E-Print Network [OSTI]

We theoretically demonstrate that earthquake shield made of seismic crystal can damp down surface waves, which are the most destructive type for constructions. In the paper, seismic crystal is introduced in aspect of band gaps (Stop band) and some design concepts for earthquake and tsunami shielding were discussed in theoretical manner. We observed in our FDTD based 2D elastic wave simulations that proposed earthquake shield could provide about 0.5 reductions in magnitude of surface wave on the Richter scale. This reduction rate in magnitude can considerably reduce destructions in the case of earthquake.

B. Baykant Alagoz; Serkan Alagoz

2009-02-09T23:59:59.000Z

391

Seismic Search for Strange Quark Nuggets  

E-Print Network [OSTI]

Bounds on masses and abundances of Strange Quark Nuggets (SQNs) are inferred from a seismic search on Earth. Potential SQN bounds from a possible seismic search on the Moon are reviewed and compared with Earth capabilities. Bounds are derived from the data taken by seismometers implanted on the Moon by the Apollo astronauts. We show that the Apollo data implies that the abundance of SQNs in the region of 10 kg to one ton must be at least an order of magnitude less than would saturate the dark matter in the solar neighborhood.

Eugene T. Herrin; Doris C. Rosenbaum; Vigdor L. Teplitz

2005-05-29T23:59:59.000Z

392

Advanced motor driven clamped borehole seismic receiver  

DOE Patents [OSTI]

A borehole seismic tool is described including a borehole clamp which only moves perpendicular to the borehole. The clamp is driven by an electric motor, via a right angle drive. When used as a seismic receiver, the tool has a three part housing, two of which are hermetically sealed. Accelerometers or geophones are mounted in one hermetically sealed part, the electric motor in the other hermetically sealed part, and the clamp and right angle drive in the third part. Preferably the tool includes cable connectors at both ends. Optionally a shear plate can be added to the clamp to extend the range of the tool.

Engler, B.P.; Sleefe, G.E.; Striker, R.P.

1993-02-23T23:59:59.000Z

393

Parametric study of relay seismic capacity  

Science Journals Connector (OSTI)

An evaluation of the existing relay test data base at Brookhaven National Laboratory (BNL) has indicated that the seismic capacity of a relay may depend on various parameters related to the design or the input motion. In order to investigate the effect of these parameters on the seismic fragility level, BNL has conducted a relay test program. Establishing the correlation between the single frequency fragility test input and the corresponding multifrequency response spectrum (TRS) is also an objective of this test program. The testing has been performed at Wyle Laboratories. This paper discusses the methodology used for testing and presents a brief summary of important test results.

K. Bandyopadhyay; C. Hofmayer

1992-01-01T23:59:59.000Z

394

Accelerated Seismic Release and Related Aspects of Seismicity Patterns on Earthquake Faults  

E-Print Network [OSTI]

of seismicity patterns associated with several theoretical frameworks. The subcritical crack growth approach developed to describe deformation on a crack prior to the occurrence of dynamic rupture predicts great

Lyakhovsky, Vladimir

395

MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN  

Open Energy Info (EERE)

MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN THE COSO GETHERMAL FIELD, CALIFORNIA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN THE COSO GETHERMAL FIELD, CALIFORNIA Details Activities (1) Areas (1) Regions (0) Abstract: High precision earthquake locations and subsurface velocity structure provide potential insights into fracture system geometry, fluid conduits and fluid compartmentalization critical to geothermal reservoir management. We analyze 16 years of seismicity to improve hypocentral locations and simultaneously invert for the seismic velocity structure within the Coso Geothermal Field (CGF). The CGF has been continuously

396

Imaging and sensing based on muon tomography  

DOE Patents [OSTI]

Techniques, apparatus and systems for detecting particles such as muons for imaging applications. Subtraction techniques are described to enhance the processing of the muon tomography data.

Morris, Christopher L; Saunders, Alexander; Sossong, Michael James; Schultz, Larry Joe; Green, J. Andrew; Borozdin, Konstantin N; Hengartner, Nicolas W; Smith, Richard A; Colthart, James M; Klugh, David C; Scoggins, Gary E; Vineyard, David C

2012-10-16T23:59:59.000Z

397

Self-interaction-free time-dependent density-functional theory for molecular processes in strong fields: High-order harmonic generation of H2 in intense laser fields  

E-Print Network [OSTI]

Self-interaction-free time-dependent density-functional theory for molecular processes in strong work of Hohenberg and Kohn 1 and Kohn and Sham 2 , the steady-state density-functional theory DFT has-electron systems, within the density-functional theory, is much less developed. The central theme of the modern

Chu, Shih-I

398

Laser- and Radar-based Mission Concepts for Suborbital and Spaceborne Monitoring of Seismic Surface Waves  

SciTech Connect (OSTI)

The development of a suborbital or spaceborne system to monitor seismic waves poses an intriguing prospect for advancing the state of seismology. This capability would enable an unprecedented global mapping of the velocity structure of the earth's crust, understanding of earthquake rupture dynamics and wave propagation effects, and event source location, characterization and discrimination that are critical for both fundamental earthquake research and nuclear non-proliferation applications. As part of an ongoing collaboration between LLNL and JPL, an advanced mission concept study assessed architectural considerations and operational and data delivery requirements, extending two prior studies by each organization--a radar-based satellite system (JPL) for earthquake hazard assessment and a feasibility study of space- or UAV-based laser seismometer systems (LLNL) for seismic event monitoring. Seismic wave measurement requirements include lower bounds on detectability of specific seismic sources of interest and wave amplitude accuracy for different levels of analysis, such as source characterization, discrimination and tomography, with a 100 {micro}m wave amplitude resolution for waves nominally traveling 5 km/s, an upper frequency bound based on explosion and earthquake surface displacement spectra, and minimum horizontal resolution (1-5 km) and areal coverage, in general and for targeted observations. For a radar system, corresponding engineering and operational factors include: Radar frequency (dictated by required wave amplitude measurement accuracy and maximizing ranging, Doppler or interferometric sensitivity), time sampling (maximum seismic wave frequency and velocity), and overall system considerations such as mass, power and data rate. Technical challenges include characterization of, and compensation for, phase distortion resulting from atmospheric and ionospheric perturbations and turbulence, and effects of ground scattering characteristics and seismic ground motion on phase coherence over interferometric time intervals. Since the temporal sampling requirement may be finer than that possible for a high-altitude sensor to traverse a synthetic aperture length, a geostationary, real-aperture Ka-band system or constellation for equatorial and moderate-latitude global coverage is one option considered. The short wavelength would maximize interferometric sensitivity to small surface displacements and minimize required antenna area. Engineering issues include the design and deployment of a large ({approx} 100m) fixed aperture antenna; and fast electronic beam steering (entire aperture within nominal 1 s interferometric interval) with high-efficiency integrated transmit/receive modules. For a suborbital system, platform instability is an issue whereas at high earth orbit signal-to-noise and attendant power requirements dominate. Data delivery requirements include large-volume data storage and transmission; development of real-time, on-board event detection and processing algorithms, and data management structures for these very large data sets. A far-term roadmap would comprise a proof-of-concept demonstration using a laser or radar system mounted on a stratospheric balloon or UAV to image seismic wavefields from planned events (e.g. large mine blasts and/or purpose-designed explosions) and earthquake targets of opportunity. The technological challenges to developing any such seismic monitoring system, whether laser- or radar-based, are at this stage enormous. However, these concept studies suggest the long-term feasibility of such a system and drive the development of enabling technologies while fostering collaboration on meeting scientific and operational challenges of agencies such as NASA, DOE and DoD.

Foxall, W; Schultz, C A; Tralli, D M

2004-09-21T23:59:59.000Z

399

Software-defined Radio based Wireless Tomography: Experimental Demonstration and  

E-Print Network [OSTI]

1 Software-defined Radio based Wireless Tomography: Experimental Demonstration and Verification presents an experimental demonstration of Software-Defined Radio (SDR) based wireless tomography us- ing follows our vision and previous theoretical study of wireless tomography which combines wireless

Qiu, Robert Caiming

400

Phenotyping transgenic embryonic murine hearts using optical coherence tomography  

E-Print Network [OSTI]

Phenotyping transgenic embryonic murine hearts using optical coherence tomography Michael W optical coherence tomography (OCT) to characterize the morphological phenotype of embryonic murine hearts the etiology of heart defects. Optical coherence tomography (OCT)6,7 measures coherently gated backreflected

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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

Properties of Some Integral Transforms Arising in Tomography  

E-Print Network [OSTI]

This dissertation deals with several types of imaging: radio tomography, single scattering optical tomography, photoacoustic tomography, and Compton camera imaging. Each of these tomographic techniques leads to a Radon-type transform...

Moon, Sunghwan

2013-10-11T23:59:59.000Z

402

Distributed computing of Seismic Imaging Algorithms  

E-Print Network [OSTI]

The primary use of technical computing in the oil and gas industries is for seismic imaging of the earth's subsurface, driven by the business need for making well-informed drilling decisions during petroleum exploration and production. Since each oil/gas well in exploration areas costs several tens of millions of dollars, producing high-quality seismic images in a reasonable time can significantly reduce the risk of drilling a "dry hole". Similarly, these images are important as they can improve the position of wells in a billion-dollar producing oil field. However seismic imaging is very data- and compute-intensive which needs to process terabytes of data and require Gflop-years of computation (using "flop" to mean floating point operation per second). Due to the data/computing intensive nature of seismic imaging, parallel computing are used to process data to reduce the time compilation. With introducing of Cloud computing, MapReduce programming model has been attracted a lot of attention in parallel and di...

Emami, Masnida; Jaberi, Nasrin

2012-01-01T23:59:59.000Z

403

Seismic Travel-Time Residuals and Plates  

Science Journals Connector (OSTI)

......United States, Canada and Greenland under the auspices of Project Vela Uniform (Long Range Seismic Measurements 1966). Arrival...1 that if we plot residuals on the focal sphere, we are at liberty to ascribe these residuals to source effects, receiver effects......

D. Davies; D. P. McKenzie

1969-09-01T23:59:59.000Z

404

A Seismic Look Under the Continents  

Science Journals Connector (OSTI)

...resources. C. Hamilton's Views of the Solar System includes a presentation by R...presents relief maps of Earth. Views of the Solar System includes an Earth topography animation...information on broadband seismic experiments in Tanzania and South Africa are included. A. Nyblade...

Karen M. Fischers; Rob D. van der Hilst

1999-08-27T23:59:59.000Z

405

Recommissioning the K-1600 Seismic Test Facility  

SciTech Connect (OSTI)

The Center of Natural Phenomena Engineering (CNPE) was established under the technical direction of Dr. James E. Beavers with a mandate to assess, by analyses and testing, the seismic capacity of building structures that house sensitive processes at the Oak Ridge Y-12 Plant. This mandate resulted in a need to recommission the K-1600 Seismic Test Facility (STF) at the Oak Ridge K-25 Site, which had been shutdown for 6 years. This paper documents the history of the facility and fives some salient construction, operation, and performance details of its 8-ton, 20-foot center of gravity payload bi-axial seismic simulator. A log of activities involved in the restart of this valuable resource is included as Table 1. Some of problems and solutions associated with recommissioning the facility under a relatively limited budget are included. The unique attributes of the shake table are discussed. The original mission and performance requirements are compared to current expanded mission and performance capabilities. Potential upgrades to further improve the capabilities of the test facility as an adjunct to the CNPE are considered. Additional uses for the facility are proposed, including seismic qualification testing of devices unique to enrichment technologies and associated hazardous waste treatment and disposal processes. In summary, the STF restart in conjunction with CNPE has added a vital, and unique facility to the list of current national resources utilized for earthquake engineering research and development. 3 figs., 1 tab.

Wynn, C.C. (Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States)); Brewer, D.W. (Oak Ridge National Lab., TN (United States))

1991-10-01T23:59:59.000Z

406

Reservoir permeability from seismic attribute analysis  

SciTech Connect (OSTI)

In case of porous fluid-saturated medium the Biot's poroelasticity theory predicts a movement of the pore fluid relative to the skeleton on seismic wave propagation through the medium. This phenomenon opens an opportunity for investigation of the flow properties of the hydrocarbon-saturated reservoirs. It is well known that relative fluid movement becomes negligible at seismic frequencies if porous material is homogeneous and well cemented. In this case the theory predicts an underestimated seismic wave velocity dispersion and attenuation. Based on Biot's theory, Helle et al. (2003) have numerically demonstrated the substantial effects on both velocity and attenuation by heterogeneous permeability and saturation in the rocks. Besides fluid flow effect, the effects of scattering (Gurevich, et al., 1997) play very important role in case of finely layered porous rocks and heterogeneous fluid saturation. We have used both fluid flow and scattering effects to derive a frequency-dependent seismic attribute which is proportional to fluid mobility and applied it for analysis of reservoir permeability.

Silin, Dmitriy; Goloshubin, G.; Silin, D.; Vingalov, V.; Takkand, G.; Latfullin, M.

2008-02-15T23:59:59.000Z

407

SEISMIC ATTRIBUTES IN GEOTHERMAL FIELDS | Open Energy Information  

Open Energy Info (EERE)

SEISMIC ATTRIBUTES IN GEOTHERMAL FIELDS SEISMIC ATTRIBUTES IN GEOTHERMAL FIELDS Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: SEISMIC ATTRIBUTES IN GEOTHERMAL FIELDS Details Activities (1) Areas (1) Regions (0) Abstract: Large velocity contrasts are regularly encountered in geothermal fields due to poorly consolidated and hydro-thermally altered rocks. The appropriate processing of seismic data is therefore crucial to delineate the geological structure. To assess the benefits of surface seismic surveys in such settings, we applied different migration procedures to image a synthetic reservoir model and seismic data from the Coso Geothermal Field. We have shown that the two-dimensional migration of synthetic seismic data from a typical reservoir model resolves the geological structure very well

408

Computed Tomography software and standards  

SciTech Connect (OSTI)

This document establishes the software design, nomenclature, and conventions for industrial Computed Tomography (CT) used in the Nondestructive Evaluation Section at Lawrence Livermore National Laboratory. It is mainly a users guide to the technical use of the CT computer codes, but also presents a proposed standard for describing CT experiments and reconstructions. Each part of this document specifies different aspects of the CT software organization. A set of tables at the end describes the CT parameters of interest in our project. 4 refs., 6 figs., 1 tab.

Azevedo, S.G.; Martz, H.E.; Skeate, M.F.; Schneberk, D.J.; Roberson, G.P.

1990-02-20T23:59:59.000Z

409

Contribution of atom-probe tomography to a better understanding...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

atom-probe tomography to a better understanding of glass alteration mechanisms: application to a nuclear glass Contribution of atom-probe tomography to a better understanding of...

410

Resistivity Tomography At Crump's Hot Springs Area (DOE GTP)...  

Open Energy Info (EERE)

Tomography At Crump's Hot Springs Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Resistivity Tomography At Crump's Hot Springs...

411

Understanding Atom Probe Tomography of Oxide-Supported Metal...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Atom Probe Tomography of Oxide-Supported Metal Nanoparticles by Correlation with Atomic Resolution Electron Understanding Atom Probe Tomography of Oxide-Supported Metal...

412

Using X-Ray Computed Tomography in Pore Structure Characterization...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Using X-Ray Computed Tomography in Pore Structure Characterization for a Berea Sandstone: Resolution Effect. Using X-Ray Computed Tomography in Pore Structure Characterization for...

413

ALGEBRAIC ASPECTS OF EMISSION TOMOGRAPHY WITH ABSORPTION  

E-Print Network [OSTI]

ALGEBRAIC ASPECTS OF EMISSION TOMOGRAPHY WITH ABSORPTION L. Hajdu and R. Tijdeman Abstract of emission tomography with absorption, con- sider a ray (such as light or X-ray) transmitting through #1; e #22;x ; where #22; #21; 0 denotes the absorption coeÃ?cient of the material, and x is the length

Tijdeman, Robert

414

Fast Globally Convergent Reconstruction in Emission Tomography  

E-Print Network [OSTI]

considerable speedup by using only a subset of the projection data per sub- iteration. However, OSEM1 Fast Globally Convergent Reconstruction in Emission Tomography Using COSEM, an Incremental EM globally convergent incremental EM algorithms for reconstruction in emission tomography, COSEM- ML

Rangarajan, Anand

415

Improving Electrical Resistivity Tomography for Characterization of  

E-Print Network [OSTI]

Improving Electrical Resistivity Tomography for Characterization of Non-point Source Contaminants runoff on Arizona's potable water. Electrical resistivity tomography (ERT) shows promise as a noninvasive on the environment. Urban and agricultural runoff are often associated with an increase in water electrical

Fay, Noah

416

Seismic modelling of a fractured carbonate reservoir in Abu Dhabi, United Arab Emirates  

E-Print Network [OSTI]

Seismic modelling of a fractured carbonate reservoir in Abu Dhabi, United Arab Emirates Mohammed Y is required to optimize hydrocarbon production. A rock containing parallel fractures can be seismically to the seismic wavelength. Seismic anisotropy may be detectable from attributes of pre-stack 3-D seismic data

Ali, Mohammed

417

Seismic Emissions Surveys | Open Energy Information  

Open Energy Info (EERE)

Emissions Surveys Emissions Surveys Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Seismic Emissions Surveys Abstract With recent improvements in acquiring, processing and interpreting data, seismic ground noise provides a valuable tool for geothermal exploration. A time domain beam steering array processing technique is employed. This process eliminates the occurrence of false anomalies caused by local geologic amplification effects. Surveys of this type are used to located naturally fractured reservoirs. Results form Dixie Valley and Desert Peak, Nevada correlate well with the location of productive wells or known geology. Authors Katz and Lewis J. Published Journal Geothermal Resources Council Transactions, 1984 DOI Not Provided Check for DOI availability: http://crossref.org

418

Definition: Seismic Techniques | Open Energy Information  

Open Energy Info (EERE)

Techniques Techniques Seismic methods provide information regarding the elastic properties of the subsurface through the measurement of the propagation velocity of elastic waves.[1] View on Wikipedia Wikipedia Definition Seismology /saɪzˈmɒlədʒi/ is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies. The field also includes studies of earthquake effects, such as tsunamis as well as diverse seismic sources such as volcanic, tectonic, oceanic, atmospheric, and artificial processes (such as explosions). A related field that uses geology to infer information regarding past earthquakes is paleoseismology. A recording of earth motion as a function of time is called a seismogram. A seismologist

419

Seismic switch for strong motion measurement  

DOE Patents [OSTI]

A seismic switching device that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is user controlled between 1 and 15 seconds. If the threshold level is exceeded during a switch time period, the length of time is extended from that instant by one user set time period.

Harben, Philip E. (Oakley, CA); Rodgers, Peter W. (Santa Barbara, CA); Ewert, Daniel W. (Patterson, CA)

1995-01-01T23:59:59.000Z

420

Seismic switch for strong motion measurement  

DOE Patents [OSTI]

A seismic switching device is described that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is user controlled between 1 and 15 seconds. If the threshold level is exceeded during a switch time period, the length of time is extended from that instant by one user set time period. 11 figs.

Harben, P.E.; Rodgers, P.W.; Ewert, D.W.

1995-05-30T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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.


421

On seismic signatures of rapid variation  

E-Print Network [OSTI]

We present an improved model for an asteroseismic diagnostic contained in the frequency spacing of low-degree acoustic modes. By modelling in a realistic manner regions of rapid variation of dynamically relevant quantities, which we call acoustic glitches, we can derive signatures of the gross properties of those glitches. In particular, we are interested in measuring properties that are related to the helium ionization zones and to the rapid variation in the background state associated with the lower boundary of the convective envelope. The formula for the seismic diagnostic is tested against a sequence of theoretical models of the Sun, and is compared with seismic diagnostics published previously by Monteiro & Thompson (1998, 2005) and by Basu et al. (2004).

G. Houdek; D. O. Gough

2006-12-01T23:59:59.000Z

422

Development Of Active Seismic Vector-Wavefield Imaging Technology For  

Open Energy Info (EERE)

Of Active Seismic Vector-Wavefield Imaging Technology For Of Active Seismic Vector-Wavefield Imaging Technology For Geothermal Applications Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Development Of Active Seismic Vector-Wavefield Imaging Technology For Geothermal Applications Details Activities (2) Areas (2) Regions (0) Abstract: This report describes the development and testing of vector-wavefield seismic sources that can generate shear (S) waves that may be valuable in geothermal exploration and reservoir characterization. Also described is a 3-D seismic data-processing effort to create images of Rye Patch geothermal reservoir from 3-D sign-bit data recorded over the geothermal prospect. Two seismic sources were developed and tested in this study that can be used to illuminate geothermal reservoirs with S-waves.

423

Statistical study of seismicity associated with geothermal reservoirs in  

Open Energy Info (EERE)

study of seismicity associated with geothermal reservoirs in study of seismicity associated with geothermal reservoirs in California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Statistical study of seismicity associated with geothermal reservoirs in California Details Activities (5) Areas (5) Regions (0) Abstract: Statistical methods are outlined to separate spatially, temporally, and magnitude-dependent portions of both the random and non-random components of the seismicity. The methodology employed compares the seismicity distributions with a generalized Poisson distribution. Temporally related events are identified by the distribution of the interoccurrence times. The regions studied to date include the Imperial Valley, Coso, The Geysers, Lassen, and the San Jacinto fault. The spatial characteristics of the random and clustered components of the seismicity

424

Integrative seismic safety evaluation of a high concrete arch dam  

Science Journals Connector (OSTI)

Abstract An integrative seismic safety evaluation of an arch dam should include all sources of nonlinearities, dynamic interactions between different components and the external loads. The present paper investigates the calibration procedure and nonlinear seismic response of an existing high arch dam. The first part explains the conducted analyses for the static and thermal calibrations of the dam based on site measurements. The second part investigates the nonlinear seismic analysis of the calibrated model considering the effect of joints, cracking of mass concrete, reservoir–dam–rock interaction, hydrodynamic pressure inside the opened joints and the geometric nonlinearity. Penetration of the water inside the opened joints accelerates the damage process. The integrative seismic assessment of a case study shows that the dam will fail under the maximum credible earthquake scenario. The dam is judged to be severely damaged with extensive cracking and the joints undergo opening/sliding. A systematic procedure is proposed for seismic and post-seismic safety of dams.

M.A. Hariri-Ardebili; M.R. Kianoush

2014-01-01T23:59:59.000Z

425

High vertical resolution crosswell seismic imaging  

DOE Patents [OSTI]

A method for producing high vertical resolution seismic images from crosswell data is disclosed. In accordance with one aspect of the disclosure, a set of vertically spaced, generally horizontally extending continuous layers and associated nodes are defined within a region between two boreholes. The specific number of nodes is selected such that the value of a particular characteristic of the subterranean region at each of the nodes is one which can be determined from the seismic data. Once values are established at the nodes, values of the particular characteristic are assigned to positions between the node points of each layer based on the values at node within that layer and without regard to the values at node points within any other layer. A seismic map is produced using the node values and the assigned values therebetween. In accordance with another aspect of the disclosure, an approximate model of the region is established using direct arrival traveltime data. Thereafter, the approximate model is adjusted using reflected arrival data. In accordance with still another aspect of the disclosure, correction is provided for well deviation. An associated technique which provides improvements in ray tracing is also disclosed.

Lazaratos, Spyridon K. (Houston, TX)

1999-12-07T23:59:59.000Z

426

Relay testing parametric investigation of seismic fragility  

SciTech Connect (OSTI)

The seismic capacity of most electrical equipment is governed by malfunction of relays. An evaluation of the existing relay test data base at Brookhaven National Laboratory (BNL) has indicated that the seismic fragility of a relay may depend on various parameters related to the design or the input motion. In particular, the electrical mode, contact state, adjustment, chatter duration acceptance limit, and the frequency and the direction of the vibration input have been considered to influence the relay fragility level. For a particular relay type, the dynamics of its moving parts depends on the exact model number and vintage and hence, these parameters may also influence the fragility level. In order to investigate the effect of most of these parameters on the seismic fragility level, BNL has conducted a relay test program. The testing has been performed at Wyle Laboratories. Establishing the correlation between the single frequency fragility test input and the corresponding multifrequency response spectrum (TRS) is also an objective of this test program. This paper discusses the methodology used for testing and presents a brief summary of important test results. 1 ref., 10 figs.

Bandyopadhyay, K.; Hofmayer, C.; Kassir, M.; Pepper, S.

1989-01-01T23:59:59.000Z

427

Basis for seismic provisions of DOE-STD-1020  

SciTech Connect (OSTI)

DOE-STD-1020 provides for a graded approach for the seismic design and evaluation of DOE structures, systems, and components (SSC). Each SSC is assigned to a Performance Category (PC) with a performance description and an approximate annual probability of seismic-induced unacceptable performance, P{sub F}. The seismic annual probability performance goals for PC 1 through 4 for which specific seismic design and evaluation criteria are presented. DOE-STD-1020 also provides a seismic design and evaluation procedure applicable to achieve any seismic performance goal annual probability of unacceptable performance specified by the user. The desired seismic performance goal is achieved by defining the seismic hazard in terms of a site-specified design/evaluation response spectrum (called herein, the Design/Evaluation Basis Earthquake, DBE). Probabilistic seismic hazard estimates are used to establish the DBE. The resulting seismic hazard curves define the amplitude of the ground motion as a function of the annual probability of exceedance P{sub H} of the specified seismic hazard. Once the DBE is defined, the SSC is designed or evaluated for this DBE using adequately conservative deterministic acceptance criteria. To be adequately conservative, the acceptance criteria must introduce an additional reduction in the risk of unacceptable performance below the annual risk of exceeding the DBE. The ratio of the seismic hazard exceedance probability P{sub H} to the performance goal probability P{sub F} is defined herein as the risk reduction ratio. The required degree of conservatism in the deterministic acceptance criteria is a function of the specified risk reduction ratio.

Kennedy, R.C. [RPK Structural Mechanics Consulting, Yorba Linda, CA (United States); Short, S.A. [EQE International, Inc., San Francisco, CA (United States)

1994-04-01T23:59:59.000Z

428

Third Quarter Hanford Seismic Report for Fiscal Year 2005  

SciTech Connect (OSTI)

Hanford Seismic Monitoring provides an uninterrupted collection of high-quality raw and processed seismic data from the Hanford Seismic Network for the U.S. Department of Energy and its contractors. Hanford Seismic Monitoring also locates and identifies sources of seismic activity and monitors changes in the historical pattern of seismic activity at the Hanford Site. The data are compiled, archived, and published for use by the Hanford Site for waste management, Natural Phenomena Hazards assessments, and engineering design and construction. In addition, the seismic monitoring organization works with the Hanford Site Emergency Services Organization to provide assistance in the event of a significant earthquake on the Hanford Site. The Hanford Seismic Network and the Eastern Washington Regional Network consist of 41 individual sensor sites and 15 radio relay sites maintained by the Hanford Seismic Monitoring staff. For the Hanford Seismic Network, there were 337 triggers during the third quarter of fiscal year 2005. Of these triggers, 20 were earthquakes within the Hanford Seismic Network. The largest earthquake within the Hanford Seismic Network was a magnitude 1.3 event May 25 near Vantage, Washington. During the third quarter, stratigraphically 17 (85%) events occurred in the Columbia River basalt (approximately 0-5 km), no events in the pre-basalt sediments (approximately 5-10 km), and three (15%) in the crystalline basement (approximately 10-25 km). During the first quarter, geographically five (20%) earthquakes occurred in swarm areas, 10 (50%) earthquakes were associated with a major geologic structure, and 5 (25%) were classified as random events.

Reidel, Steve P.; Rohay, Alan C.; Hartshorn, Donald C.; Clayton, Ray E.; Sweeney, Mark D.

2005-09-01T23:59:59.000Z

429

The contribution of pattern recognition of seismic and morphostructural data to seismic hazard assessment  

E-Print Network [OSTI]

The reliable statistical characterization of the spatial and temporal properties of large earthquakes occurrence is one of the most debated issues in seismic hazard assessment, due to the unavoidably limited observations from past events. We show that pattern recognition techniques, which are designed in a formal and testable way, may provide significant space-time constraints about impending strong earthquakes. This information, when combined with physically sound methods for ground shaking computation, like the neo-deterministic approach (NDSHA), may produce effectively preventive seismic hazard maps. Pattern recognition analysis of morphostructural data provide quantitative and systematic criteria for identifying the areas prone to the largest events, taking into account a wide set of possible geophysical and geological data, whilst the formal identification of precursory seismicity patterns (by means of CN and M8S algorithms), duly validated by prospective testing, provides useful constraints about impend...

Peresan, Antonella; Soloviev, Alexander; Panza, Giuliano F

2014-01-01T23:59:59.000Z

430

Lorentz Force Electrical Impedance Tomography  

E-Print Network [OSTI]

This article describes a method called Lorentz Force Electrical Impedance Tomography. The electrical conductivity of biological tissues can be measured through their sonication in a magnetic field: the vibration of the tissues inside the field induces an electrical current by Lorentz force. This current, detected by electrodes placed around the sample, is proportional to the ultrasonic pressure, to the strength of the magnetic field and to the electrical conductivity gradient along the acoustic axis. By focusing at different places inside the sample, a map of the electrical conductivity gradient can be established. In this study experiments were conducted on a gelatin phantom and on a beef sample, successively placed in a 300 mT magnetic field and sonicated with an ultrasonic transducer focused at 21 cm emitting 500 kHz bursts. Although all interfaces are not visible, in this exploratory study a good correlation is observed between the electrical conductivity image and the ultrasonic image. This method offers...

Grasland-Mongrain, Pol; Chapelon, Jean-Yves; Lafon, Cyril

2014-01-01T23:59:59.000Z

431

Positron emission tomography wrist detector  

DOE Patents [OSTI]

A method of serially transferring annihilation information in a compact positron emission tomography (PET) scanner includes generating a time signal representing a time-of-occurrence of an annihilation event, generating an address signal representing a channel detecting the annihilation event, and generating a channel signal including the time and address signals. The method also includes generating a composite signal including the channel signal and another similarly generated channel signal concerning another annihilation event. An apparatus that serially transfers annihilation information includes a time signal generator, address signal generator, channel signal generator, and composite signal generator. The time signal is asynchronous and the address signal is synchronous to a clock signal. A PET scanner includes a scintillation array, detection array, front-end array, and a serial encoder. The serial encoders include the time signal generator, address signal generator, channel signal generator, and composite signal generator.

Schlyer, David J. (Bellport, NY); O'Connor, Paul (Bellport, NY); Woody, Craig (Setauket, NY); Junnarkar, Sachin Shrirang (Sound Beach, NY); Radeka, Veljko (Bellport, NY); Vaska, Paul (Sound Beach, NY); Pratte, Jean-Francois (Stony Brook, NY)

2006-08-15T23:59:59.000Z

432

Collimator-free photon tomography  

DOE Patents [OSTI]

A method of uncollimated single photon emission computed tomography includes administering a radioisotope to a patient for producing gamma ray photons from a source inside the patient. Emissivity of the photons is measured externally of the patient with an uncollimated gamma camera at a plurality of measurement positions surrounding the patient for obtaining corresponding energy spectrums thereat. Photon emissivity at the plurality of measurement positions is predicted using an initial prediction of an image of the source. The predicted and measured photon emissivities are compared to obtain differences therebetween. Prediction and comparison is iterated by updating the image prediction until the differences are below a threshold for obtaining a final prediction of the source image. 6 figs.

Dilmanian, F.A.; Barbour, R.L.

1998-10-06T23:59:59.000Z

433

Collimator-free photon tomography  

DOE Patents [OSTI]

A method of uncollimated single photon emission computed tomography includes administering a radioisotope to a patient for producing gamma ray photons from a source inside the patient. Emissivity of the photons is measured externally of the patient with an uncollimated gamma camera at a plurality of measurement positions surrounding the patient for obtaining corresponding energy spectrums thereat. Photon emissivity at the plurality of measurement positions is predicted using an initial prediction of an image of the source. The predicted and measured photon emissivities are compared to obtain differences therebetween. Prediction and comparison is iterated by updating the image prediction until the differences are below a threshold for obtaining a final prediction of the source image.

Dilmanian, F. Avraham (Yaphank, NY); Barbour, Randall L. (Westbury, NY)

1998-10-06T23:59:59.000Z

434

Seismic amplitude and coherency response of channel sand, offshore Louisiana, Gulf of Mexico  

E-Print Network [OSTI]

hazard delineation. This paper describes a new technique for drilling hazard identification using a conventional 3 D seismic amplitude dataset. An event coherence calculation program is applied to a 3 D seismic dataset to derive seismic attributes...

Fischer, Elena Mikhaylovna

2012-06-07T23:59:59.000Z

435

Seismic Performance Assessment and Probabilistic Repair Cost Analysis of Precast Concrete Cladding Systems for Multistory Buildings  

E-Print Network [OSTI]

Nov. 8- 9. Arnold, C. 2008. Seismic Safety of the BuildingTab Connections for Gravity and Seismic Loads. Steel Tips,and Brown, A.T. 1995a. Seismic Performance of Architectural

Hunt, Jeffrey Patrick

2010-01-01T23:59:59.000Z

436

UC Berkeley Seismic Guidelines, Appendix II: Ground Motion Time Histories for the UC Berkeley Campus  

E-Print Network [OSTI]

U.C. BERKELEY SEISMIC GUIDELINES APPENDIX II GROUND MOTIONthe deaggregation of the seismic hazard. These values at aK-net site whose soil and seismic wave velocity profiles are

Authors, Various

2010-01-01T23:59:59.000Z

437

Seismic Earth Pressures on Retaining Structures and Basement Walls in Cohesionless Soils  

E-Print Network [OSTI]

50 4.4. Seismic Behavior of Retaining Wall-BackfillWhitman, R. V. (1999). “Seismic analysis and design of rigidBalkema, Rotterdam. Building Seismic Safety Council. (2010).

Geraili Mikola, Roozbeh

2012-01-01T23:59:59.000Z

438

Borehole Seismic Monitoring of Injected CO2 at the Frio Site  

E-Print Network [OSTI]

D. , 2001, Orbital vibrator seismic source for simultaneous5: Tomographic image of seismic velocity change due to CO 2Borehole Seismic Monitoring of Injected CO 2 at the Frio

Daley, Thomas M.; Myer, Larry R.; Hoversten, G.M.; Peterson, John E.; Korneev, Valeri A.

2006-01-01T23:59:59.000Z

439

Seismic Assessment and Retrofit of Existing Multi-Column Bent Bridges  

E-Print Network [OSTI]

Seismic Assessment and Retrofit of Existing Multi-Column Bent Bridges By Cole C. Mc ................................................................................................................................... 6 Seismic Activity in Western Washington State Approach ­ Bridge Modeling .............................................11 Seismic Excitations

440

In Vivo Characterization of a Wide area 802.11b Wireless Seismic Array  

E-Print Network [OSTI]

area 802.11b Wireless Seismic Array Martin Lukac, Vinayakpresent a study of the MASE seismic data collection networkthe network. In the case of seismic sensing applications the

Lukac, Martin; Naik, Vineyak; Stubailo, Igor; Husker, Allen; Estrin, D

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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.


441

Migration of a coarse fluvial sediment pulse detected by hysteresis in bedload generated seismic waves  

E-Print Network [OSTI]

J. , Brodsky, Emily E. , 2011. A seismic signature of riverSpectral anal- ysis of seismic noise induced by rivers: a2010. Location of river-induced seismic signal from noise

Roth, Danica L; Finnegan, Noah J; Brodsky, Emily E; Cook, K.L.; Stark, C.P.; Wang, H.W.

2014-01-01T23:59:59.000Z

442

Effects of Sounds From Seismic Air Guns on Fish Behavior and Catch Rates  

Science Journals Connector (OSTI)

Seismic surveys are performed to explore for oil ... Concerns have been raised about the impacts of seismic air gun emissions on marine life, and fishermen in particular claim that seismic surveys have a serious ...

Svein Løkkeborg; Egil Ona; Aud Vold; Are Salthaug

2012-01-01T23:59:59.000Z

443

Seismic baseline and induction studies- Roosevelt Hot Springs...  

Open Energy Info (EERE)

studies- Roosevelt Hot Springs, Utah and Raft River, Idaho Abstract Local seismic networks were established at the Roosevelt Hot Springs geothermal area, utah and at Raft...

444

Advanced Seismic Data Analysis Program- The "Hot Pot" Project  

Broader source: Energy.gov [DOE]

Advanced Seismic Data Analysis Program- The "Hot Pot" Project presentation at the April 2013 peer review meeting held in Denver, Colorado.

445

Geothermal: Sponsored by OSTI -- Application of seismic tomographic...  

Office of Scientific and Technical Information (OSTI)

Application of seismic tomographic techniques in the investigation of geothermal systems Geothermal Technologies Legacy Collection HelpFAQ | Site Map | Contact Us | Admin Log On...

446

Seismic Studies of a Massive Hydraulic Fracturing Experiment...  

Open Energy Info (EERE)

a Massive Hydraulic Fracturing Experiment Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Seismic Studies of a Massive Hydraulic Fracturing...

447

Poroelastic modeling of seismic boundary conditions across a fracture  

E-Print Network [OSTI]

seismic wave scattering off nonplanar e.g., curved and intersecting fractures. .... wave studies by Pyrak-Nolte and Cook 1987, and Nihei et al. 1999.

2007-07-20T23:59:59.000Z

448

Geographic Information System At Central Nevada Seismic Zone...  

Open Energy Info (EERE)

navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geographic Information System At Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2005 - 2)...

449

Statistical study of seismicity associated with geothermal reservoirs...  

Open Energy Info (EERE)

include the Imperial Valley, Coso, The Geysers, Lassen, and the San Jacinto fault. The spatial characteristics of the random and clustered components of the seismicity are...

450

Seismic damage identification for steel structures using distributed fiber optics  

Science Journals Connector (OSTI)

A distributed fiber optic monitoring methodology based on optic time domain reflectometry technology is developed for seismic damage identification of steel structures. Epoxy with a...

Hou, Shuang; Cai, C S; Ou, Jinping

2009-01-01T23:59:59.000Z

451

Teleseismic-Seismic Monitoring At Geysers Area (Zucca, Et Al...  

Open Energy Info (EERE)

Zucca, Et Al., 1994) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Teleseismic-Seismic Monitoring At Geysers Area (Zucca, Et Al., 1994)...

452

Teleseismic-Seismic Monitoring At Valles Caldera - Redondo Geothermal...  

Open Energy Info (EERE)

Steck, Et Al., 1998) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Teleseismic-Seismic Monitoring At Valles Caldera - Redondo Geothermal Area...

453

Towards the Understanding of Induced Seismicity in Enhanced Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

Geothermal Program UCB * EGS operations rely on small-scale seismicity to delineate fracture extent, fracture type and pathways for water * EGS operations need to understand...

454

Seismic Technology Adapted to Analyzing and Developing Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

of geothermal prospects beneath volcanic outcrops. Seismic-based quantification of fracture orientation and intensity will result in optimal positioning of geothermal wells....

455

Seismic Technology Adapted to Analyzing and Developing Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

of geothermal prospects beneath volcanic outcrops. * Seismic-based quantification of fracture orientation and intensity will result in optimal positioning of geothermal wells. *...

456

Towards the Understanding of Induced Seismicity in Enhanced Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

Office eere.energy.gov * EGS operations rely on small-scale seismicity to delineate fracture extent, fracture type and pathways for water * EGS operations need to understand...

457

Joint inversion of electrical and seismic data for Fracture char...  

Broader source: Energy.gov (indexed) [DOE]

Joint inversion of electrical and seismic data for Fracture char. and Imaging of Fluid Flow in Geothermal Systems Michael Batzle, PI Colorado School of Mines Track Name: Fluid...

458

Seismic functionality of essential relays in operating nuclear plants  

Science Journals Connector (OSTI)

The regulatory criteria for licensing of nuclear power plants require that certain safety-related equipment and systems be designed to function during and following a postulated, design basis earthquake. Demonstration of seismic adequacy must be performed and formally documented by shake-table testing, analysis or other specified methods. Since many older, operating nuclear power plants were designed and constructed prior to the issuance of the current seismic qualification criteria, the NRC has questioned whether the seismic adequacy of the essential equipment has been adequately demonstrated and documented. This concern is identified in Unresolved Safety Issue A-46, “Seismic Qualification of Equipment in Operating Nuclear Power Plants”. In response to this concern, a group of affected plant owners, the Seismic Qualification Utility Group (SQUG), with support from the Electric Power Research Institute (EPRI), has undertaken a program to demonstrate the seismic adequacy of essential equipment by the use of actual experience with such equipment in plants which have undergone significant earthquakes and by the use of available seismic qualification data for similar equipment. An important part of this program is the development of data and the methodology for verifying the functionality of electrical relays used in essential circuits needed for plant shutdown during a seismic event. This paper describes this part of the Seismic Qualification Utility Group program. The relay functionality evaluation methodology is being developed under EPRI Project No. RP2849-1.

W.R. Schmidt; R.P. Kassawara

1988-01-01T23:59:59.000Z

459

Data Acquisition-Manipulation At Central Nevada Seismic Zone...  

Open Energy Info (EERE)

- 2) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Data Acquisition-Manipulation At Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2005...

460

Teleseismic-Seismic Monitoring At Valles Caldera - Sulphur Springs...  

Open Energy Info (EERE)

Lee Steck (1997) Heterogeneous Structure Around the Jemez Volcanic Field, New Mexico, USA, as Inferred from the Envelope Inversion of Active-Experiment Seismic Data Additional...

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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.


461

An experimental and numerical study of wind turbine seismic behavior  

E-Print Network [OSTI]

of Seismic and Wind Load Combinations 8.5.2 Extremeextrapolation for wind turbine extreme loads. ” Wind Energy,extrapolation for wind turbine extreme loads. ” 46th AIAA

Prowell, I.

2011-01-01T23:59:59.000Z

462

Axial Tomography from Digitized Real Time Radiography  

DOE R&D Accomplishments [OSTI]

Axial tomography from digitized real time radiographs provides a useful tool for industrial radiography and tomography. The components of this system are: x-ray source, image intensifier, video camera, video line extractor and digitizer, data storage and reconstruction computers. With this system it is possible to view a two dimensional x-ray image in real time at each angle of rotation and select the tomography plane of interest by choosing which video line to digitize. The digitization of a video line requires less than a second making data acquisition relatively short. Further improvements on this system are planned and initial results are reported.

Zolnay, A. S.; McDonald, W. M.; Doupont, P. A.; McKinney, R. L.; Lee, M. M.

1985-01-18T23:59:59.000Z

463

Tau-p analysis of large-offset seismic data from the PASSCAL Ouachita Seismic Experiment  

E-Print Network [OSTI]

Kansas (Brown et al, 1983). Interpretations of depth (in km) to Moho along seismic refraction lines from: 1, Cram (1961); 2, Dorman, et al (1972); 3, Ewing et al (1955); 4, Hales et al (1970)l 5, McCamey and hleyer (1966); 6, Mitchell and Landisman... Kansas (Brown et al, 1983). Interpretations of depth (in km) to Moho along seismic refraction lines from: 1, Cram (1961); 2, Dorman, et al (1972); 3, Ewing et al (1955); 4, Hales et al (1970)l 5, McCamey and hleyer (1966); 6, Mitchell and Landisman...

Lizarralde, Daniel

2012-06-07T23:59:59.000Z

464

SciTech Connect: Proceedings of the 23rd Seismic Research Symposium...  

Office of Scientific and Technical Information (OSTI)

3rd Seismic Research Symposium: Worldwide Monitoring of Nuclear Explosions Citation Details In-Document Search Title: Proceedings of the 23rd Seismic Research Symposium: Worldwide...

465

SciTech Connect: Proceedings of the 25th Seismic Research Review...  

Office of Scientific and Technical Information (OSTI)

5th Seismic Research Review -- Nuclear Explosion Monitoring: Building the Knowledge Base Citation Details In-Document Search Title: Proceedings of the 25th Seismic Research Review...

466

SciTech Connect: Proceedings of the 26th Seismic Research Review...  

Office of Scientific and Technical Information (OSTI)

6th Seismic Research Review: Trends in Nuclear Explosion Monitoring Citation Details In-Document Search Title: Proceedings of the 26th Seismic Research Review: Trends in Nuclear...

467

SciTech Connect: Proceedings of the 24th Seismic Research Review...  

Office of Scientific and Technical Information (OSTI)

4th Seismic Research Review: Nuclear Explosion Monitoring: Innovation and Integration Citation Details In-Document Search Title: Proceedings of the 24th Seismic Research Review:...

468

SciTech Connect: Proceedings of the 27th Seismic Research Review...  

Office of Scientific and Technical Information (OSTI)

7th Seismic Research Review: Ground-Based Nuclear Explosion Monitoring Technologies Citation Details In-Document Search Title: Proceedings of the 27th Seismic Research Review:...

469

SciTech Connect: Proceedings of the 21st Seismic Research Symposium...  

Office of Scientific and Technical Information (OSTI)

1st Seismic Research Symposium: Technologies for Monitoring The Comprehensive Nuclear Test-Ban Treaty Citation Details In-Document Search Title: Proceedings of the 21st Seismic...

470

A direct displacement-based design of low-rise seismic resistant steel moment frames  

E-Print Network [OSTI]

Lateral Force Distribution for Seismic Design StructuralLateral Force Distribution for Seismic Design . 169stiffness distribution are additional design choices that

Harris, John L.

2006-01-01T23:59:59.000Z

471

Practical Characterization of Quantum Devices without Tomography  

Science Journals Connector (OSTI)

Quantum tomography is the main method used to assess the quality of quantum information processing devices. However, the amount of resources needed for quantum tomography is exponential in the device size. Part of the problem is that tomography generates much more information than is usually sought. Taking a more targeted approach, we develop schemes that enable (i) estimating the fidelity of an experiment to a theoretical ideal description, (ii) learning which description within a reduced subset best matches the experimental data. Both these approaches yield a significant reduction in resources compared to tomography. In particular, we demonstrate that fidelity can be estimated from a number of simple experiments that is independent of the system size, removing an important roadblock for the experimental study of larger quantum information processing units.

Marcus P. da Silva; Olivier Landon-Cardinal; David Poulin

2011-11-16T23:59:59.000Z

472

Phase-Conjugate Optical Coherence Tomography  

E-Print Network [OSTI]

We demonstrate a new type of optical coherence tomography using only classical resources to achieve results that are typically associated with quantum-enhanced metrology: factor-of-two axial resolution enhancement and ...

Shapiro, Jeffrey H.

473

Positron Emission Tomography Physics, Instrumentation, Data Analysis  

E-Print Network [OSTI]

1 Positron Emission Tomography Physics, Instrumentation, Data Analysis Carl K. Hoh, MD Department fast computer Filtered Back Projection Iterative Reconstruction PET Image Reconstruction #12 PET Scanner Design · Smaller individual crystal size = better spatial resolution · Physical limit

Liu, Thomas T.

474

3D Imaging with Holographic Tomography  

Science Journals Connector (OSTI)

There are two main types of tomography that enable the 3D internal structures of objects to be reconstructed from scattered data. The commonly known computerized tomography (CT) give good results in the x?ray wavelength range where the filtered back?projection theorem and Radon transform can be used. These techniques rely on the Fourier projection?slice theorem where rays are considered to propagate straight through the object. Another type of tomography called ‘diffraction tomography’ applies in applications in optics and acoustics where diffraction and scattering effects must be taken into account. The latter proves to be a more difficult problem as light no longer travels straight through the sample. Holographic tomography is a popular way of performing diffraction tomography and there has been active experimental research on reconstructing complex refractive index data using this approach recently. However there are two distinct ways of doing tomography: either by rotation of the object or by rotation of the illumination while fixing the detector. The difference between these two setups is intuitive but needs to be quantified. From Fourier optics and information transformation point of view we use 3D transfer function analysis to quantitatively describe how spatial frequencies of the object are mapped to the Fourier domain. We first employ a paraxial treatment by calculating the Fourier transform of the defocused OTF. The shape of the calculated 3D CTF for tomography by scanning the illumination in one direction only takes on a form that we might call a ’peanut ’ compared to the case of object rotation where a diablo is formed the peanut exhibiting significant differences and non?isotropy. In particular there is a line singularity along one transverse direction. Under high numerical aperture conditions the paraxial treatment is not accurate and so we make use of 3D analytical geometry to calculate the behaviour in the non?paraxial case. This time we obtain a similar peanut but without the line singularity.

Colin J. R. Sheppard; Shan Shan Kou

2010-01-01T23:59:59.000Z

475

High-resolution imaging of microvasculature in human skin in-vivo with optical coherence tomography  

E-Print Network [OSTI]

using swept-source optical coherence tomography,” Opt. Lett.J. G. Fujimoto, “Optical coherence tomography,” Science 254(volumes using optical coherence tomography,” Opt. Lett. 22(

Liu, Gangjun; Jia, Wangcun; Sun, Victor; Choi, Bernard; Chen, Zhongping

2012-01-01T23:59:59.000Z

476

Reference spectrum extraction and fixed-pattern noise removal in optical coherence tomography  

E-Print Network [OSTI]

OCIS codes: (110.4500) Optical coherence tomography; (170.4500) Optical coherence tomography; (100.2000) Digitalvs. time domain optical coherence tomography,” Opt. Express

Moon, Sucbei; Lee, Sang-Won; Chen, Zhongping

2010-01-01T23:59:59.000Z

477

In vivo three-dimensional microelectromechanical endoscopic swept source optical coherence tomography  

E-Print Network [OSTI]

with endoscopic optical coherence tomography”, Opt. Express,G. Fujimoto, "Optical coherence tomography," Science, 254,endoscope for optical coherence tomography”,Opt. Lett. 21,

Su, Jianping; Zhang, Jun; Yu, Linfeng; Chen, Zhongping

2007-01-01T23:59:59.000Z

478

Seismic data obtained using. 50-caliber machine gun as high-resolution seismic source  

SciTech Connect (OSTI)

A seismic line across a shoestring sandstone served as a test of a .50-caliber machine gun as a high-resolution seismic source in exploring for shallow sandstones. The line crosses part of the Bronson-Xenia oil field, which produces from the Bartlesville sandstone of the Cherokee Group (Pennsylvanian) in Bourbon County, Kansas, at a depth of 622 ft (190 m). The reservoir, which has a flat base and an irregular top, may represent a superposition of fluvial sandstones. The seismic line clearly depicts a lenticular sandstone that is up to 56 ft (17 m) thick. Both the lateral extent of the sandstone body and a slight velocity pull-up of the underlying layers are evident. In addition to the target sandstone, two additional sandstone bodies may be present at the east end of the line, where well control is not available. Analysis of the seismic data indicates that the frequency of the .50-caliber sources is from 30 to 170 Hz. The high frequencies are retained deep into the section. Two shots per shotpoint are the minimum number necessary for acquiring high-quality data, and 12-fold is the minimum acceptable common-depth-point (CDP) coverage. 11 figures.

Seeber, M.D.; Steeples, D.

1986-08-01T23:59:59.000Z

479

HANFORD DOUBLE SHELL TANK THERMAL AND SEISMIC PROJECT SEISMIC ANALYSIS OF HANFORD DOUBLE SHELL TANKS  

SciTech Connect (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 (DST) Integrity Project - DST Thermal and Seismic Analyses. The original scope of the project was 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). Although Milestone M-48-14 has been met, Revision I is being issued to address external review comments with emphasis on changes in the modeling of anchor bolts connecting the concrete dome and the steel primary tank. The work statement provided to M&D (PNNL 2003) required that a nonlinear soil structure interaction (SSI) analysis be performed on the DSTs. The analysis is required to include the effects of sliding interfaces and fluid sloshing (fluid-structure interaction). SSI analysis has traditionally been treated by frequency domain computer codes such as SHAKE (Schnabel, et al. 1972) and SASSI (Lysmer et al. 1999a). Such frequency domain programs are limited to the analysis of linear systems. Because of the contact surfaces, the response of the DSTs to a seismic event is inherently nonlinear and consequently outside the range of applicability of the linear frequency domain programs. That is, the nonlinear response of the DSTs to seismic excitation requires the use of a time domain code. The capabilities and limitations of the commercial time domain codes ANSYS{reg_sign} and MSC Dytran{reg_sign} for performing seismic SSI analysis of the DSTs and the methodology required to perform the detailed seismic analysis of the DSTs has been addressed in Rinker et al (2006a). On the basis of the results reported in Rinker et al. (2006a), it is concluded that time-domain SSI analysis using ANSYS{reg_sign} is justified for predicting the global response of the DSTs. The most significant difference between the current revision (Revision 1) of this report and the original issue (Revision 0) is the treatment of the anchor bolts that tie the steel dome of the primary tank to the concrete tank dome.

MACKEY TC; RINKER MW; CARPENTER BG; HENDRIX C; ABATT FG

2009-01-15T23:59:59.000Z

480

First Quarter Hanford Seismic Report for Fiscal Year 2011  

SciTech Connect (OSTI)

The Hanford Seismic Assessment Program (HSAP) provides an uninterrupted collection of high-quality raw and processed seismic data from the Hanford Seismic Network for the U.S. Department of Energy and its contractors. The HSAP is responsible for locating and identifying sources of seismic activity and monitoring changes in the historical pattern of seismic activity at the Hanford Site. The data are compiled, archived, and published for use by the Hanford Site for waste management, natural phenomena hazards assessments, and engineering design and construction. In addition, the HSAP works with the Hanford Site Emergency Services Organization to provide assistance in the event of a significant earthquake on the Hanford Site. The Hanford Seismic Network and the Eastern Washington Regional Network consist of 44 individual sensor sites and 15 radio relay sites maintained by the Hanford Seismic Assessment Team. The Hanford Seismic Network recorded 16 local earthquakes during the first quarter of FY 2011. Six earthquakes were located at shallow depths (less than 4 km), seven earthquakes at intermediate depths (between 4 and 9 km), most likely in the pre-basalt sediments, and three earthquakes were located at depths greater than 9 km, within the basement. Geographically, thirteen earthquakes were located in known swarm areas and three earthquakes were classified as random events. The highest magnitude event (1.8 Mc) was recorded on October 19, 2010 at depth 17.5 km with epicenter located near the Yakima River between the Rattlesnake Mountain and Horse Heaven Hills swarm areas.

Rohay, Alan C.; Sweeney, Mark D.; Clayton, Ray E.; Devary, Joseph L.

2011-03-31T23:59:59.000Z

Note: This page contains sample records for the topic "time-dependent seismic tomography" 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.


481

DESIGN PHILOSOPHY FOR STEEL STRUCTURES IN MODERATE SEISMIC REGIONS  

E-Print Network [OSTI]

DESIGN PHILOSOPHY FOR STEEL STRUCTURES IN MODERATE SEISMIC REGIONS E.M. Hines1 and L.A. Fahnestock2 ABSTRACT The authors propose a design philosophy for steel buildings in moderate seismic regions that draws to the continued development and validation of this philosophy. Introduction Recent widespread adoption

Hines, Eric

482

Rayleigh's Principle in Finite Element Calculations of Seismic Wave Response  

Science Journals Connector (OSTI)

......of Seismic Wave Response Warwick D. Smith...resulting error in frequency is of second order...conserve computer storage for large models...estimatesof the seismic response of irregular Earth...complex one, and this frequency is then accurate...to the potential energy and the denominator......

Warwick D. Smith; Bruce A. Bolt

1958-12-01T23:59:59.000Z

483

First Quarter Hanford Seismic Report for Fiscal Year 2009  

SciTech Connect (OSTI)

The Hanford Seismic Assessment Program (HSAP) provides an uninterrupted collection of high-quality raw and processed seismic data from the Hanford Seismic Network for the U.S. Department of Energy and its contractors. The HSAP is responsible for locating and identifying sources of seismic activity and monitoring changes in the historical pattern of seismic activity at the Hanford Site. The data are compiled, archived, and published for use by the Hanford Site for waste management, natural phenomena hazards assessments, and engineering design and construction. In addition, the HSAP works with the Hanford Site Emergency Services Organization to provide assistance in the event of a significant earthquake on the Hanford Site. The Hanford Seismic Network and the Eastern Washington Regional Network consist of 44 individual sensor sites and 15 radio relay sites maintained by the Hanford Seismic Assessment Team. This includes three recently acquired Transportable Array stations located at Cold Creek, Didier Farms, and Phinney Hill. For the Hanford Seismic Network, ten local earthquakes were recorded during the first quarter of fiscal year 2009. All earthquakes were considered as “minor” with magnitudes (Mc) less than 1.0. Two earthquakes were located at shallow depths (less than 4 km), most likely in the Columbia River basalts; five earthquakes at intermediate depths (between 4 and 9 km), most likely in the sub-basalt sediments); and three earthquakes were located at depths greater than 9 km, within the basement. Geographically, four earthquakes occurred in known swarm areas and six earthquakes were classified as random events.

Rohay, Alan C.; Sweeney, Mark D.; Hartshorn, Donald C.; Clayton, Ray E.; Devary, Joseph L.

2009-03-15T23:59:59.000Z

484

Three-component borehole wall-locking seismic detector  

DOE Patents [OSTI]

A seismic detector for boreholes is described that has an accelerometer sensor block for sensing vibrations in geologic formations of the earth. The density of the seismic detector is approximately matched to the density of the formations in which the detector is utilized. A simple compass is used to orient the seismic detector. A large surface area shoe having a radius approximately equal to the radius of the borehole in which the seismic detector is located may be pushed against the side of the borehole by actuating cylinders contained in the seismic detector. Hydraulic drive of the cylinders is provided external to the detector. By using the large surface area wall-locking shoe, force holding the seismic detector in place is distributed over a larger area of the borehole wall thereby eliminating concentrated stresses. Borehole wall-locking forces up to ten times the weight of the seismic detector can be applied thereby ensuring maximum detection frequency response up to 2,000 hertz using accelerometer sensors in a triaxial array within the seismic detector.

Owen, Thomas E. (Helotes, TX)

1994-01-01T23:59:59.000Z

485

FOCUSED GAUSSIAN BEAMS FOR SEISMIC IMAGING ROBERT L. NOWACK  

E-Print Network [OSTI]

FOCUSED GAUSSIAN BEAMS FOR SEISMIC IMAGING ROBERT L. NOWACK Abstract. The application of focused Gaussian beams is investigated for the seismic imaging of common-shot reflection data. The focusing of Gaussian beams away from the source and receiver surface adds flexibility to beam imaging algorithms

Nowack, Robert L.

486

Detection of Underground Marlpit Quarries Using High Resolution Seismic  

E-Print Network [OSTI]

Detection of Underground Marlpit Quarries Using High Resolution Seismic B. Piwakowski* (Ecole of high resolution reflection seismic for the detection and location of underground marlpit quarries of the geological structure, the results show that the detection of marlpit underground quarries, often considered

Boyer, Edmond

487

Seismic active control by neutral networks  

SciTech Connect (OSTI)

A study on the application of artificial neural networks (ANNs) to active structural control under seismic loads is carried out. The structure considered is a single-degree-of-freedom (SDF) system with an active bracing device. The control force is computed by a trained neural network. The feedforward neural network architecture and an adaptive backpropagation training algorithm is used in the study. The neural net is trained to reproduce the function that represents the response-excitation relationship of the SDF system under seismic loads. The input-output training patterns are generated randomly. In the backpropagation training algorithm, the learning rate is determined by ensuring the decrease of the error function at each epoch. The computer program implemented is validated by solving the classification of the XOR problem. Then, the trained ANN is used to compute the control force according to the control strategy. If the control force exceeds the actuator`s capacity limit, it is set equal to that limit. The concept of the control strategy employed herein is to apply the control force at every time step to cancel the system velocity induced at the preceding time step so that the gradual rhythmic buildup of the response is destroyed. The ground motions considered in the numerical example are the 1940 El Centro earthquake and the 1979 Imperial Valley earthquake in California. The system responses with and without the control are calculated and compared. The feasibility and potential of applying ANNs to seismic active control is asserted by the promising results obtained from the numerical examples studied.

Tang, Yu

1995-12-31T23:59:59.000Z

488

Seismic active control by neural networks.  

SciTech Connect (OSTI)

A study on the application of artificial neural networks (ANNs) to activate structural control under seismic loads is carried out. The structure considered is a single-degree-of-freedom (SDF) system with an active bracing device. The control force is computed by a trained neural network. The feed-forward neural network architecture and an adaptive back-propagation training algorithm is used in the study. The neural net is trained to reproduce the function that represents the response-excitation relationship of the SDF system under seismic loads. The input-output training patterns are generated randomly. In the back-propagation training algorithm, the learning rate is determined by ensuring the decrease of the error function at each epoch. The computer program implemented is validated by solving the classification of the XOR problem. Then, the trained ANN is used to compute the control force according to the control strategy. If the control force exceeds the actuator's capacity limit, it is set equal to that limit. The concept of the control strategy employed herein is to apply the control force at every time step to cancel the system velocity induced at the preceding time step so that the gradual rhythmic buildup of the response is destroyed. The ground motions considered in the numerical example are the 1940 El Centro earthquake and the 1979 Imperial Valley earthquake in California. The system responses with and without the control are calculated and compared. The feasibility and potential of applying ANNs to seismic active control is asserted by the promising results obtained from the numerical examples studied.

Tang, Y.

1998-01-01T23:59:59.000Z

489

Development of a HT seismic downhole tool.  

SciTech Connect (OSTI)

Enhanced Geothermal Systems (EGS) require the stimulation of the drilled well, likely through hydraulic fracturing. Whether fracturing of the rock occurs by shear destabilization of natural fractures or by extensional failure of weaker zones, control of the fracture process will be required to create the flow paths necessary for effective heat mining. As such, microseismic monitoring provides one method for real-time mapping of the fractures created during the hydraulic fracturing process. This monitoring is necessary to help assess stimulation effectiveness and provide the information necessary to properly create the reservoir. In addition, reservoir monitoring of the microseismic activity can provide information on reservoir performance and evolution over time. To our knowledge, no seismic tool exists that will operate above 125 C for the long monitoring durations that may be necessary. Replacing failed tools is costly and introduces potential errors such as depth variance, etc. Sandia has designed a high temperature seismic tool for long-term deployment in geothermal applications. It is capable of detecting microseismic events and operating continuously at temperatures up to 240 C. This project includes the design and fabrication of two High Temperature (HT) seismic tools that will have the capability to operate in both temporary and long-term monitoring modes. To ensure the developed tool meets industry requirements for high sampling rates (>2ksps) and high resolution (24-bit Analog-to-Digital Converter) two electronic designs will be implemented. One electronic design will utilize newly developed 200 C electronic components. The other design will use qualified Silicon-on-Insulator (SOI) devices and will have a continuous operating temperature of 240 C.

Maldonado, Frank P.; Greving, Jeffrey J.; Henfling, Joseph Anthony; Chavira, David J.; Uhl, James Eugene; Polsky, Yarom

2009-06-01T23:59:59.000Z

490

On the seismic age of the Sun  

E-Print Network [OSTI]

We use low-degree acoustic modes obtained by the BiSON to estimate the main-sequence age $t_\\odot$ of the Sun. The calibration is accomplished by linearizing the deviations from a standard solar model the seismic frequencies of which are close to those of the Sun. Formally, we obtain the preliminary value $t_\\odot=4.68\\pm0.02 $Gy, coupled with an initial heavy-element abundance $Z=0.0169\\pm0.0005$. The quoted standard errors, which are not independent, are upper bounds implied under the assumption that the standard errors in the observed frequencies are independent.

G. Houdek; D. O. Gough

2007-10-03T23:59:59.000Z

491

Economical standard quantum process tomography  

E-Print Network [OSTI]

Recently, Bendersky \\emph{et al.} developed a method to complete the task of characterizing an arbitrary $\\chi$ matrix element in a scalable way, Phys. Rev. Lett. Vol. \\textbf{100}, 190403(2008), where an auxiliary system was needed. In present work, we shall show that the same task can also be completed within the scheme of standard quantum process tomography (SQPT) where there is no requirement for ancilla. Our method depends on two observations: With the elaborately chosen operators basis, the SQPT may have an economical form where a single run of experiment, in which we measure the expectation value of a chosen operator in the outport of the quantum channel with a known input, is sufficient to characterize a selected $\\chi$ matrix element; With the progress recently achieved in quantum entanglement detection, we also find that the number of the experimental settings to realize the experiment for the selected $\\chi$ matrix element does not exceed 2N for the N-qubits system. For practice, our scheme can be applied for the cases where the controlled two-body interaction is neither available nor desirable.

Xiaohua Wu; Ke Xu

2010-11-30T23:59:59.000Z

492

Geographic Information System At Central Nevada Seismic Zone Region  

Open Energy Info (EERE)

Central Nevada Seismic Zone Region Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2005 - 2) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geographic Information System At Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2005 - 2) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Geographic Information System Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Mark Coolbaugh, Richard Zehner, Corne Kreemer, David Blackwell, Gary Oppliger (2005) A Map Of Geothermal Potential For The Great Basin, Usa- Recognition Of Multiple Geothermal Environments Retrieved from "http://en.openei.org/w/index.php?title=Geographic_Information_System_At_Central_Nevada_Seismic_Zone_Region_(Coolbaugh,_Et_Al.,_2005_-_2)&oldid=401371

493

Data Acquisition-Manipulation At Central Nevada Seismic Zone Region  

Open Energy Info (EERE)

Central Nevada Seismic Zone Region Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2005 - 2) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Data Acquisition-Manipulation At Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2005 - 2) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Data Acquisition-Manipulation Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Mark Coolbaugh, Richard Zehner, Corne Kreemer, David Blackwell, Gary Oppliger (2005) A Map Of Geothermal Potential For The Great Basin, Usa- Recognition Of Multiple Geothermal Environments Retrieved from "http://en.openei.org/w/index.php?title=Data_Acquisition-Manipulation_At_Central_Nevada_Seismic_Zone_Region_(Coolbaugh,_Et_Al.,_2005_-_2)&oldid=401360"

494

Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and Raft River, Idaho Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and Raft River, Idaho Details Activities (2) Areas (2) Regions (0) Abstract: Local seismic networks were established at the Roosevelt Hot Springs geothermal area, utah and at Raft River geothermal area, Idaho to monitor the background seismicity prior to initiation of geothermal power production. The Raft River study area is currently seismically quiet down

495

Refraction Survey At Central Nevada Seismic Zone Region (Heimgartner, Et  

Open Energy Info (EERE)

Refraction Survey At Central Nevada Seismic Zone Region (Heimgartner, Et Refraction Survey At Central Nevada Seismic Zone Region (Heimgartner, Et Al., 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Refraction Survey At Central Nevada Seismic Zone Region (Heimgartner, Et Al., 2005) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Refraction Survey Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Michelle Heimgartner, James B. Scott, Weston Thelen, Christopher R. Lopez, John N. Louie (2005) Variable Crustal Thickness In The Western Great Basin- A Compilation Of Old And New Refraction Data Retrieved from "http://en.openei.org/w/index.php?title=Refraction_Survey_At_Central_Nevada_Seismic_Zone_Region_(Heimgartner,_Et_Al.,_2005)&oldid=401382

496

Seismic-Scale Rock Physics of Methane Hydrate  

SciTech Connect (OSTI)

We quantify natural methane hydrate reservoirs by generating synthetic seismic traces and comparing them to real seismic data: if the synthetic matches the observed data, then the reservoir properties and conditions used in synthetic modeling might be the same as the actual, in-situ reservoir conditions. This approach is model-based: it uses rock physics equations that link the porosity and mineralogy of the host sediment, pressure, and hydrate saturation, and the resulting elastic-wave velocity and density. One result of such seismic forward modeling is a catalogue of seismic reflections of methane hydrate which can serve as a field guide to hydrate identification from real seismic data. We verify this approach using field data from known hydrate deposits.

Amos Nur

2009-01-08T23:59:59.000Z

497

Time-dependent density-functional theory for molecular processes in strong fields: Study of multiphoton processes and dynamical response of individual valence electrons of N2 in intense laser fields  

E-Print Network [OSTI]

in the exchange ~x!- only limit. In the latter approach @1#, theTime-dependent density-functional theor Study of multiphoton processes and dynam of N2 in inten Xi Chu and Department of Chemistry, University of Kansas, and Kansas Ce ~Received 30 July 2001; pu We...-I CHU PHYSICAL REVIEW A 64 0634041sg 21su 22sg 22su 21pu 43sg 2 . According to the valence bond theory, this molecule has a triple bond formed with 3sg and 1pu electrons. The 3sg orbital is parallel to the internuclear axis and the two degen- erate 1pu...

Chu, Xi; Chu, Shih-I

2001-11-14T23:59:59.000Z

498

First Quarter Hanford Seismic Report for Fiscal Year 2008  

SciTech Connect (OSTI)

The Hanford Seismic Assessment Program (HSAP) provides an uninterrupted collection of high-quality raw and processed seismic data from the Hanford Seismic Network for the U.S. Department of Energy and its contractors. The Hanford Seismic Assessment Team locates and identifies sources of seismic activity and monitors changes in the historical pattern of seismic activity at the Hanford Site. The data are compiled, archived, and published for use by the Hanford Site for waste management, natural phenomena hazards assessments, and engineering design and construction. In addition, the seismic monitoring organization works with the Hanford Site Emergency Services Organization to provide assistance in the event of a significant earthquake on the Hanford Site. The Hanford Seismic Network and the Eastern Washington Regional Network consist of 41 individual sensor sites and 15 radio relay sites maintained by the Hanford Seismic Assessment Team. For the Hanford Seismic Network, forty-four local earthquakes were recorded during the first quarter of fiscal year 2008. A total of thirty-one micro earthquakes were recorded within the Rattlesnake Mountain swarm area at depths in the 5-8 km range, most likely within the pre-basalt sediments. The largest event recorded by the network during the first quarter (November 25, 2007 - magnitude 1.5 Mc) was located within this swarm area at a depth of 4.3 km. With regard to the depth distribution, three earthquakes occurred at shallow depths (less than 4 km, most likely in the Columbia River basalts), thirty-six earthquakes at intermediate depths (between 4 and 9 km, most likely in the pre-basalt sediments), and five earthquakes were located at depths greater than 9 km, within the crystalline basement. Geographically, thirty-eight earthquakes occurred in swarm areas and six earth¬quakes were classified as random events.

Rohay, Alan C.; Sweeney, Mark D.; Hartshorn, Donald C.; Clayton, Ray E.; Devary, Joseph L.

2008-03-21T23:59:59.000Z

499

Second Quarter Hanford Seismic Report for Fiscal Year 2008  

SciTech Connect (OSTI)

The Hanford Seismic Assessment Program (HSAP) provides an uninterrupted collection of high-quality raw and processed seismic data from the Hanford Seismic Network for the U.S. Department of Energy and its contractors. The Hanford Seismic Assessment Team locates and identifies sources of seismic activity and monitors changes in the historical pattern of seismic activity at the Hanford Site. The data are compiled, archived, and published for use by the Hanford Site for waste management, natural phenomena hazards assessments, and engineering design and construction. In addition, the seismic monitoring organization works with the Hanford Site Emergency Services Organization to provide assistance in the event of a significant earthquake on the Hanford Site. The Hanford Seismic Network and the Eastern Washington Regional Network consist of 44 individual sensor sites and 15 radio relay sites maintained by the Hanford Seismic Assessment Team. For the Hanford Seismic Network, seven local earthquakes were recorded during the second quarter of fiscal year 2008. The largest event recorded by the network during the second quarter (February 3, 2008 - magnitude 2.3 Mc) was located northeast of Richland in Franklin County at a depth of 22.5 km. With regard to the depth distribution, two earthquakes occurred at shallow depths (less than 4 km, most likely in the Columbia River basalts), three earthquakes at intermediate depths (between 4 and 9 km, most likely in the pre-basalt sediments), and two earthquakes were located at depths greater than 9 km, within the crystalline basement. Geographically, five earthquakes occurred in swarm areas and two earthquakes were classified as random events.

Rohay, Alan C.; Sweeney, Mark D.; Hartshorn, Donald C.; Clayton, Ray E.; Devary, Joseph L.

2008-06-26T23:59:59.000Z

500

Seismic response study for base-isolated CANDU 3  

SciTech Connect (OSTI)

The design of the CANDU 3 nuclear power plant rated at 450 MW of net output power is being developed by AECL. During the development of the CANDU 3 design, various design options including the use of seismic isolator bearings are considered to mitigate effects of seismic loads. The current design of CANDU 3 is of fixed-base construction. However, analytical studies are undertaken to determine the effects of using seismic isolation. This paper presents a study of the benefits of using seismic isolator bearings for the CANDU 3 nuclear power plant. To base-isolate the CANDU 3 plant, the reactor and other safety-related buildings would be located on a common mat isolated from the foundation with the use of elastomeric bearings. Seismic analyses are performed to predict the behavior of the structures. A mathematical model consisting of lumped masses and beams to represent different buildings of the CANDU 3 plant is considered in the analysis. The model considers the nonlinear characteristics of the elastomeric bearing. Nonlinear time-history analyses are performed to determine the seismic responses. The acceleration, displacement and floor response spectra of different buildings are determined for both the fixed-base and base-isolated cases. The results show that the use of seismic isolation would reduce the acceleration responses of the buildings significantly. However, the displacement responses of the buildings would be increased which would require special considerations for interconnected systems. Moreover, it is shown that the floor response spectra would be reduced drastically for a base-isolated structure as compared with a fixed-base structure. This reduction of seismic responses would be of considerable benefit for the design of structures and seismic qualification of components. Lastly, a parametric study is performed to determine the effect of varying seismic input using non-linear analysis techniques.

Biswas, J.K.; Saudy, A.M. [Atomic Energy of Canada Limited, Saskatoon, Saskatchewan (Canada). Civil Engineering Branch

1995-12-31T23:59:59.000Z