SUBSHIFTS AND PERFORATION JULIEN GIOL AND DAVID KERR
Kerr, David
SUBSHIFTS AND PERFORATION JULIEN GIOL AND DAVID KERR Abstract. We demonstrate that the perforative work [29] showed that the perforation that can be observed in the ordered K0 group of certain manifolds. As a consequence of the perforation in K0, Villadsen's C-algebra fails to Date: September 8, 2008. 2000 Mathematics
Yates, D.N. Jr.; Myers, W.D.
1991-11-26T23:59:59.000Z
This patent describes a perforating gun for insertion in a wellbore into a formation. It includes a tubular housing and a tubular element, defining a flow passage.
Right-Sided Sigmoid Diverticular Perforation
Little, Andrew; Culver, Andrew
2012-01-01T23:59:59.000Z
Sigmoid Diverticular Perforation Andrew Little, MS Andyobstruction, bleeding, perforation, and colonic abscess.less common complication is perforation with formation of an
Direct numerical simulation of turbulent heat transfer in annuli: effect of heat flux ratio.
Paris-Sud XI, Université de
Direct numerical simulation of turbulent heat transfer in annuli: effect of heat flux ratio. M-la-Vall´ee cedex 2, France (Dated: October 23, 2008) Abstract Fully developed turbulent flow and heat transfer square (rms) of temperature fluctuations, turbulent heat fluxes, heat transfer, ...). To validate
Donovan, J.F.; Naquin, M.J.
1991-12-31T23:59:59.000Z
This patent describes a system for preparing a formation to allow hydrocarbons to be produced from a well. It comprises an elongated perforating gun; means extending from the outer periphery of the gun, in a generally radial direction from its longitudinal axis, for facilitating extraction of the gun from the well, the means operable when the gun is covered with a solid material delivered into the well and lodged between the formation and the gun; and the means imparting a longitudinal extractive force when the gun is rotated along its longitudinal axis.
Blunt Trauma Patient with Esophageal Perforation
Colak Oray, Nese; Sivrikaya, Semra; Bayram, Basak; Egeli, Tufan; Dicle, Oguz
2014-01-01T23:59:59.000Z
JA, Viste A. Esophageal perforation: diagnostic work-up andPatient with Esophageal Perforation clinical decision-makingBMJ. 2013;346:f3095. perforation in South of Sweden: results
Ungulate Carcasses Perforate Ecological Filters and Create
Ungulate Carcasses Perforate Ecological Filters and Create Biogeochemical Hotspots in Forest created unexpected disturbances that reduced herbaceous cover, which effectively perforated the herbaceous
ORALLOY (93.15 235U) METAL ANNULI WITH BERYLLIUM CORE
John D. Bess; Leland M. Montierth; Raymond L. Reed; John T. Mihalczo
2010-09-01T23:59:59.000Z
A variety of critical experiments were constructed of enriched uranium metal during the 1960s and 1970s at the Oak Ridge Critical Experiments Facility (ORCEF) in support of criticality safety operations at the Y-12 Plant. The purposes of these experiments included the evaluation of storage, casting, and handling limits for the Y-12 Plant and providing data for verification of calculation methods and cross-sections for nuclear criticality safety applications. These included solid cylinders of various diameters, annuli of various inner and outer diameters, two and three interacting cylinders of various diameters, and graphite and polyethylene reflected cylinders and annuli. Of the hundreds of delayed critical experiments, two were performed that consisted of uranium metal annuli with a solid beryllium metal core. The outer diameter of the annuli was approximately 13 or 15 inches with an inner diameter of 7 inches. The diameter of the core was approximately 7 inches. The critical height of the configurations was approximately 5 and 4 inches, respectively. The uranium annuli consisted of multiple stacked rings with diametral thicknesses of approximately 2 inches apiece and varying heights. The 15-inch experiment was performed on June 4, 1963, and the 13-inch experiment on July 12, 1963 by J. T. Mihalczo and R. G. Taylor (Ref. 1) with accompanying logbook. Both detailed and simplified model specifications are provided in this evaluation. Both of these fast-spectra experiments were determined to represent acceptable benchmarks. The calculated eigenvalues for both the detailed and simple models are within approximately 0.6% of the benchmark values, but significantly greater than 3s from the benchmark value because the uncertainty in the benchmark is very small: <±0.0004 (1s). There is significant variability between results using different neutron cross section libraries, the greatest being a ?keff of ~0.67%. Unreflected and unmoderated experiments with the same highly enriched uranium metal parts were performed at the Oak Ridge Critical Experiments Facility in the 1960s and are evaluated in HEU MET FAST 051. Thin graphite reflected (2 inches or less) experiments also using the same highly enriched uranium metal parts are evaluated in HEU MET FAST 071. Polyethylene-reflected configurations are evaluated in HEU-MET-FAST-076. A stack of highly enriched metal discs with a thick beryllium reflector is evaluated in HEU-MET-FAST-069.
Perforation of Inferior Vena Cava by Inferior Vena Cava Filter
Unterman, Sarah; Nair, Tad
2013-01-01T23:59:59.000Z
vena cava filter strut perforation discovered during rightin E mergency M edicine Perforation of Inferior Vena Cava bysuggestive of chronic perforation with no evidence of free
Handlebar Trauma Causing Small Bowel Hernia with Jejunal Perforation
Yaylac?, Serpil; Ercelik, Hasan; Seyit, Murat; Kocyigit, Ali; Serinken, Mustafa
2014-01-01T23:59:59.000Z
most common site of perforation, and peritoneal irritationhernia with bowel perforation presenting as a tensionBowel Hernia with Jejunal Perforation Serpil Yaylaci, MD*
Manifold Integration: Data Integration on Multiple Manifolds
Choi, Hee Youl
2011-08-08T23:59:59.000Z
MANIFOLD INTEGRATION: DATA INTEGRATION ON MULTIPLE MANIFOLDS A Dissertation by HEE YOUL CHOI Submitted to the O?ce of Graduate Studies of Texas A&M University in partial fulflllment of the requirements for the degree of DOCTOR OF PHILOSOPHY... May 2010 Major Subject: Computer Science MANIFOLD INTEGRATION: DATA INTEGRATION ON MULTIPLE MANIFOLDS A Dissertation by HEE YOUL CHOI Submitted to the O?ce of Graduate Studies of Texas A&M University in partial fulflllment of the requirements...
EFFECTIVE MACROSCOPIC DYNAMICS OF STOCHASTIC PARTIAL DIFFERENTIAL EQUATIONS IN PERFORATED
Duan, Jinqiao
EFFECTIVE MACROSCOPIC DYNAMICS OF STOCHASTIC PARTIAL DIFFERENTIAL EQUATIONS IN PERFORATED DOMAINS equation defined on a domain perforated with small holes or heterogeneities. The homogenized effective, effective macroscopic model, stochastic homogenization, white noise, probability distribution, perforated
Nasal septum perforation as the presenting sign of lupus erythematosus
Mascarenhas, R; Tellechea, O; Oliveira, H; Reis, JP; Cordeiro, M; Migueis, J
2005-01-01T23:59:59.000Z
A.R. Asymptomatic nasal septum perforation in Systemic LupusVachtenheim J, Grossmann J. Perforation of the nasal septum98. 6. Simpson J. Nasal-septum perforation in Systemic Lupus
High power laser perforating tools and systems
Zediker, Mark S; Rinzler, Charles C; Faircloth, Brian O; Koblick, Yeshaya; Moxley, Joel F
2014-04-22T23:59:59.000Z
ystems devices and methods for the transmission of 1 kW or more of laser energy deep into the earth and for the suppression of associated nonlinear phenomena. Systems, devices and methods for the laser perforation of a borehole in the earth. These systems can deliver high power laser energy down a deep borehole, while maintaining the high power to perforate such boreholes.
Tubing carried perforating gun with insulation jacket
Donovan, J.F.; Yates, D.N.
1991-05-21T23:59:59.000Z
This patent describes a method of insulating a tubing carried perforating gun which is run through a subterranean wellbore. It includes making up at the well surface a tubing string for introduction within the well, the tubing string carrying a perforating gun assembly.
A case of perforating necrobiosis lipoidica in an African American female
Abdulla, Farah R; Sheth, Pranav B
2008-01-01T23:59:59.000Z
lipoidica that have perforation as a characteristic change.report, all subsequent cases show perforation histologically
Author's personal copy Perforated diode neutron detector modules fabricated from
Shultis, J. Kenneth
Author's personal copy Perforated diode neutron detector modules fabricated from high Perforated detectors Perforated diodes a b s t r a c t Compact neutron detectors are being designed that are mass produced from high-purity Si wafers. Each detector has thousands of circular perforations etched
Body Force Model for the Aerodynamics of Inclined Perforated Surfaces
Liu, Feng
Body Force Model for the Aerodynamics of Inclined Perforated Surfaces Juntao Xiong, Andrew Johnson of perforated surfaces inclined to a freestream. The goal is to characterize the key parameters affecting perforations. The model simulates the effects of the perforated surfaces by locally applying a body force term
Sound radiation from a line forced perforated elastic sandwich panel
Sidorov, Nikita
Sound radiation from a line forced perforated elastic sandwich panel I. David Abrahams Department by altering the interior geometry, and perforations can be added to one or both sides. With perforations399 1990 devised an effective boundary condition for a perforated sandwich plate structure, valid
Zeghib, Abdelghani
Dynamics on Lorentz manifolds Abdelghani Zeghib Introduction Motivations and questions Examples Results Results Previous results Linear Dynamics General considerations Furstenberg Lemma Lorentz Dynamics://www.umpa.ens-lyon.fr/~zeghib/ (joint work with Paolo Piccione) #12;Dynamics on Lorentz manifolds Abdelghani Zeghib Introduction
Hildebrand, Richard J. (Edgemere, MD); Wozniak, John J. (Columbia, MD)
2001-01-01T23:59:59.000Z
A compressed gas storage cell interconnecting manifold including a thermally activated pressure relief device, a manual safety shut-off valve, and a port for connecting the compressed gas storage cells to a motor vehicle power source and to a refueling adapter. The manifold is mechanically and pneumatically connected to a compressed gas storage cell by a bolt including a gas passage therein.
Case of Urethral Foreign Body: IUD Perforation of the Bladder with Calculus Formation
Gillis, Erin; Chhiv, Nak; Kang, Sacha; Sayegh, Rocky; Lotfipour, Shahram
2006-01-01T23:59:59.000Z
N, Djahanbakhch O. Perforation of the uterus and colon byand partial uterine perforation and embedding followingW.Z. , Kutcher, R. ,: Uterine perforation and embedding by
The “Perforated City:” Leipzig’s Model of Urban Shrinkage Management
Florentin, Daniel
2010-01-01T23:59:59.000Z
adapt to shrinkage and perforation at an early stage in an2010 From Shrinkage to Perforation But the phenomenon tookand created a kind of “perforation” (Nuissl & Rink, 2004).
Incarcerated Diaphragmatic Hernia with Bowel Perforation Presenting as a Tension Pneumothorax
Offman, Ryan; Spencer, Ryan
2014-01-01T23:59:59.000Z
secondary to a colonic perforation during diagnosticHernia with Bowel Perforation Presenting as a Tensionempyema secondary to perforation of an incarcerated segment
Frobenius manifolds and algebraic integrability
L. K. Hoevenaars
2007-06-26T23:59:59.000Z
We give a short review of Frobenius manifolds and algebraic integrability and study their intersection. The simplest case is the relation between the Frobenius manifold of simple singularities, which is almost dual to the integrable open Toda chain. New types of manifolds called extra special Kaehler and special F-manifolds are introduced which capture the intersection.
Parameter Estimation for the Heat Equation on Perforated Domains
Parameter Estimation for the Heat Equation on Perforated Domains H.T. Banks1 , D. Cioranescu2 , A: Inverse problems, parameter estimation, perforated domains, homogeniza- tion, thermal diffusion, ordinary porous samples by use of solutions of a heat equation on a randomly perforated domain. As noted
Managing Performance vs. Accuracy Trade-offs With Loop Perforation
Polz, Martin
Managing Performance vs. Accuracy Trade-offs With Loop Perforation Stelios Sidiroglou Sasa-hoc, domain-specific techniques developed specifically for the computation at hand. Loop perforation provides of their iterations. A criticality testing phase filters out critical loops (whose perforation produces unacceptable
Acoustic Transmission Loss of Perforated Plates Vincent Phong1
Papamoschou, Dimitri
Acoustic Transmission Loss of Perforated Plates Vincent Phong1 and Dimitri Papamoschou2 University of California, Irvine, CA 92697, USA A study has been conducted on the acoustic response of perforated plates coefficient of the perforate. The theoretical analysis is based on planar wave propagation through a single
Parameter Estimation for the Heat Equation on Perforated Domains
Parameter Estimation for the Heat Equation on Perforated Domains H.T. Banks1 , D. Cioranescu2 , A for simulated data for heat flow in a porous medium. We consider data simulated from a model on a perforated Words: Inverse problems, parameter estimation, perforated domains, homogeniza- tion, thermal diffusion
Nambu-Goldstone explosion under brane perforation
D. V. Gal'tsov; E. Yu. Melkumova; S. Zamani-Mogaddam
2010-12-13T23:59:59.000Z
We show that perforation of the three-brane by mass impinging upon it from the five-dimensional bulk excites Nambu-Goldstone spherical wave propagating outwards with the velocity of light. It is speculated that such an effect can give rise to "`unmotivated" energy release events in the brane-world cosmological models.
Nambu-Goldstone explosion under brane perforation
Gal'tsov, D V; Zamani-Mogaddam, S
2010-01-01T23:59:59.000Z
We show that perforation of the three-brane by mass impinging upon it from the five-dimensional bulk excites Nambu-Goldstone spherical wave propagating outwards with the velocity of light. It is speculated that such an effect can give rise to "`unmotivated" energy release events in the brane-world cosmological models.
Djordjevic, A.
1983-12-27T23:59:59.000Z
A tool guide is described that makes possible the insertion of cleaning and/or inspection tools into a manifold pipe that will dislocate and extract the accumulated sediment in such manifold pipes. The tool guide basically comprises a right angled tube (or other angled tube as required) which can be inserted in a large tube and locked into a radially extending cross pipe by adjustable spacer rods and a spring-loaded cone, whereby appropriate cleaning tools can be inserted into the cross pipe for cleaning, inspection, etc. 3 figs.
Djordjevic, A.
1982-07-08T23:59:59.000Z
A tool guide that makes possible the insertion of cleaning and/or inspection tools into a manifold pipe that will dislocate and extract the accumulated sediment in such manifold pipes. The tool guide basically comprises a right angled tube (or other angled tube as required) which can be inserted in a large tube and locked into a radially extending cross pipe by adjustable spacer rods and a spring-loaded cone, whereby appropriate cleaning tools can be inserted into to cross pipe for cleaning, inspection, etc.
Dual manifold heat pipe evaporator
Adkins, Douglas R. (Albuquerque, NM); Rawlinson, K. Scott (Albuquerque, NM)
1994-01-01T23:59:59.000Z
An improved evaporator section for a dual manifold heat pipe. Both the upper and lower manifolds can have surfaces exposed to the heat source which evaporate the working fluid. The tubes in the tube bank between the manifolds have openings in their lower extensions into the lower manifold to provide for the transport of evaporated working fluid from the lower manifold into the tubes and from there on into the upper manifold and on to the condenser portion of the heat pipe. A wick structure lining the inner walls of the evaporator tubes extends into both the upper and lower manifolds. At least some of the tubes also have overflow tubes contained within them to carry condensed working fluid from the upper manifold to pass to the lower without spilling down the inside walls of the tubes.
Dual manifold heat pipe evaporator
Adkins, D.R.; Rawlinson, K.S.
1994-01-04T23:59:59.000Z
An improved evaporator section is described for a dual manifold heat pipe. Both the upper and lower manifolds can have surfaces exposed to the heat source which evaporate the working fluid. The tubes in the tube bank between the manifolds have openings in their lower extensions into the lower manifold to provide for the transport of evaporated working fluid from the lower manifold into the tubes and from there on into the upper manifold and on to the condenser portion of the heat pipe. A wick structure lining the inner walls of the evaporator tubes extends into both the upper and lower manifolds. At least some of the tubes also have overflow tubes contained within them to carry condensed working fluid from the upper manifold to pass to the lower without spilling down the inside walls of the tubes. 1 figure.
Perforation of domain wall by point mass
D. V. Gal'tsov; E. Yu. Melkumova; P. A. Spirin
2013-12-30T23:59:59.000Z
We investigate collision of a point particle and an infinitely thin planar domain wall interacting gravitationally within the linearized gravity in Minkowski space-time of arbitrary dimension. In this setting we are able to describe analytically the perforation of the wall by an impinging particle, showing that it is accompanied by excitation of the spherical shock branon wave propagating outwards with the speed of light. Formally, the shock wave is a free solution of the branon wave equation which has to be added to ensure the validity of the retarded solution at the perforation point. Physically, the domain wall gets excited due to the shake caused by an instantaneous change of sign of the repulsive gravitational force. This effect is shown to hold, in particular, in four space-time dimensions, being applicable to the problem of cosmological domain walls.
Perforation of domain wall by point mass
Gal'tsov, D V; Spirin, P A
2013-01-01T23:59:59.000Z
We investigate collision of a point particle and an infinitely thin planar domain wall interacting gravitationally within the linearized gravity in Minkowski space-time of arbitrary dimension. In this setting we are able to describe analytically the perforation of the wall by an impinging particle, showing that it is accompanied by excitation of the spherical shock branon wave propagating outwards with the speed of light. Formally, the shock wave is a free solution of the branon wave equation which has to be added to ensure the validity of the retarded solution at the perforation point. Physically, the domain wall gets excited due to the shake caused by an instantaneous change of sign of the repulsive gravitational force. This effect is shown to hold, in particular, in four space-time dimensions, being applicable to the problem of cosmological domain walls.
Perforation of thin unreinforced concrete slabs
Cargile, J.D. [Army Engineer Waterways Experiment Station, Vicksburg, MS (United States); Giltrud, M.E. [Defense Nuclear Agency, Washington, DC (United States); Luk, V.K. [Sandia National Labs., Albuquerque, NM (United States)
1993-10-01T23:59:59.000Z
This report discusses fourteen tests which were conducted to investigate the perforation of thin unreinforced concrete slabs. The 4340-steel projectile used in the test series is 50.8 mm in diameter, 355.6 mm in length, has a mass of 2.34 kg. and an ogive nose with caliber radius head of 3. The slabs, contained within steel culverts, are 1.52 m in diameter and consist of concrete with a nominal unconfined compressive strength of 38.2 MPa and maxima aggregate size of 9.5 mm. Slab thicknesses are 284.4, 254.0, 215.9 and 127.0 mm. Tests were conducted at impact velocities of about 313 m/s on all slab thicknesses and about 379 and 471 m/s on the 254.0-mm-thick slab. All tests were conducted at normal incidence to the slab. All tests were conducted at normal incidence to the slab. Information obtained from the tests used to determine the loading (deceleration) on the projectile during the perforation process, the velocity-displacement of the projectile as it perforated the slab, and the projectile position as damage occurred on the backface of the slab. The test projectile behaved essentially as a rigid body for all of the tests.
Miniter, Una; Bae-Harboe, Yoon-Soo Cindy; Powers, Jennifer G; Campbell, Shannon M; Goldberg, Lynne J
2012-01-01T23:59:59.000Z
adult related to bowel perforation: Report and review of thewho expired from bowel perforation. CONCLUSIONS: Severeischemia and foci of perforation of the jejunum and ileum, a
Pressure enhanced penetration with shaped charge perforators
Glenn, Lewis A. (Danville, CA)
2001-01-01T23:59:59.000Z
A downhole tool, adapted to retain a shaped charge surrounded by a superatmospherically pressurized light gas, is employed in a method for perforating a casing and penetrating reservoir rock around a wellbore. Penetration of a shaped charge jet can be enhanced by at least 40% by imploding a liner in the high pressure, light gas atmosphere. The gas pressure helps confine the jet on the axis of penetration in the latter stages of formation. The light gas, such as helium or hydrogen, is employed to keep the gas density low enough so as not to inhibit liner collapse.
Einstein manifolds with skew torsion
Ilka Agricola; Ana Cristina Ferreira
2013-02-15T23:59:59.000Z
This paper is devoted to the first systematic investigation of manifolds that are Einstein for a connection with skew symmetric torsion. We derive the Einstein equation from a variational principle and prove that, for parallel torsion, any Einstein manifold with skew torsion has constant scalar curvature; and if it is complete of positive scalar curvature, it is necessarily compact and it has finite first fundamental group. The longest part of the paper is devoted to the systematic construction of large families of examples. We discuss when a Riemannian Einstein manifold can be Einstein with skew torsion. We give examples of almost Hermitian, almost metric contact, and G2 manifolds that are Einstein with skew torsion. For example, we prove that any Einstein-Sasaki manifold and any 7-dimensional 3-Sasakian manifolds admit deformations into an Einstein metric with parallel skew torsion.
Rinard, Martin
Probabilistic Accuracy Bounds for Perforated Programs A New Foundation for Program Analysis, Accuracy, Verification, Program Analysis, Program Transformation Keywords Loop Perforation, Program an inherent perfor- mance versus accuracy trade-off -- the more computational re- sources (such as time
Stress computations on perforated polygonal domains Jonas Englund and Johan Helsing
Helsing, Johan
Stress computations on perforated polygonal domains Jonas Englund and Johan Helsing Numerical perforated with 1170 holes are presented. The general usefulness of integral equation methods is discussed
Method and apparatus for selective retraction of a tubing carried perforating gun
Rubbo, R.P.
1990-12-25T23:59:59.000Z
This patent describes apparatus for telescopically retracting a subterranean well tubing carried perforating gun.
Modeling of Microwave Ovens with Perforated Metal Walls Erin M. Kiley and Vadim V. Yakovlev
Yakovlev, Vadim
Modeling of Microwave Ovens with Perforated Metal Walls Erin M. Kiley and Vadim V. Yakovlev ovens with perforated regions of metal walls. The technique relies on replacement of perforated segments-parameters obtained by FDTD simulation of a perforated sheet in a waveguide. This approach is employed in FDTD
Finite-Element Investigation and Design Recommendations for Perforated Steel Plate Shear Walls
Bruneau, Michel
Finite-Element Investigation and Design Recommendations for Perforated Steel Plate Shear Walls.k.a. perforated SPSW . Finite element monotonic pushover analyses were conducted, first on a series of individual perforated strips with variation in perforation diameter, to develop a fundamental understanding
Evaluation of Perforated Carbonate Cores Under Acid Stimulation
Diaz, Nerwing Jose
2011-10-21T23:59:59.000Z
Although it has been shown that clean perforation tunnels facilitate the evolution of a single, deeper-penetrating wormhole, there are no reported applications of reactive shaped charges in carbonates prior to acid stimulation. The present study...
Strongly Perforated K0-Groups of Simple C ?-Algebras
K-theory (4) 15(1998), 307–322. [V]. Jesper Villadsen, Simple C*-algebras with perforation. J. Funct. Anal. (1) 154(1998), 110–116. Toftegaards Alle 26. 4 tv.
Impact perforation of monolithic polyethylene plates: projectile nose shape dependence
Mohagheghian, I.; McShane, G. J.; Stronge, W. J.
2015-02-12T23:59:59.000Z
. The perforation mechanisms and energy absorption of these PE plates are contrasted with those of thin aluminium alloy targets that have the same total mass. UHMWPE outperforms these metallic targets for all three projectile nose shapes. Finally, the influence...
Evaluation of Perforated Carbonate Cores Under Acid Stimulation
Diaz, Nerwing Jose
2011-10-21T23:59:59.000Z
Although it has been shown that clean perforation tunnels facilitate the evolution of a single, deeper-penetrating wormhole, there are no reported applications of reactive shaped charges in carbonates prior to acid stimulation. The present study...
The effect of perforation patterns upon well productivity
Neale, John William
1955-01-01T23:59:59.000Z
LIBRARY A 4N COLLEGE OF TEXAS THE EFFECT OF PERFORATION PATTERNS UPON WELL PRODUCTIVITT A Thesis By John N, Neale ~ ~ Submitted to the Graduate Sohool of the Agrioultural and Meohanioal College of Texas in partial fulfillment... of the requirements for the degree of EASTER OF SCIENCE August 1966 Na)or Subgeotg PETROLBUM ENGINEERING THE EFFEC1 OF PERFORATION IN. TTERNS UPON WELL PRODUCTIVITX 4, Thesis JOHN W, NEI, LE Approved as to style and oontent lg s 7. Chai man of ommi ttee H...
NEW RESULTS ON THE ASYMPTOTIC BEHAVIOUR OF DIRICHLET PROBLEMS IN PERFORATED DOMAINS
Garroni, Adriana
NEW RESULTS ON THE ASYMPTOTIC BEHAVIOUR OF DIRICHLET PROBLEMS IN PERFORATED DOMAINS GIANNI DAL MASO behaviour of the solutions of elliptic equations with Dirichlet boundary conditions in perforated domains
Characterization of cardiac lead perforation risk via a dynamic simulated environment
Rosario, Matthew J
2012-01-01T23:59:59.000Z
Delayed cardiac perforation is a serious medical condition where an implanted cardiac lead migrates through the heart wall, causing life-threatening complications. Where acute perforation occurs during implant, delayed ...
EQUALITY CONSTRAINTS, RIEMANNIAN MANIFOLDS AND ...
2007-07-27T23:59:59.000Z
Jul 27, 2007 ... Page 1 ... what a Riemannian manifold is, what a tangent space is, how to move .... Now, since M is a regular level set, we can do the same thing for any ...... defined geodesics as those paths on M who's lengths don't change.
Design and performance considerations for perforated semiconductor thermal-neutron detectors
Shultis, J. Kenneth
Design and performance considerations for perforated semiconductor thermal-neutron detectors J neutron detectors Solid state neutron detectors a b s t r a c t Perforated silicon structures backfilled. Although many perforated structures are possible, there are three fundamental designs that are studied
Perforated Layer Structures in Liquid Crystalline Rod-Coil Block Copolymers
Wan, Xin-hua
Perforated Layer Structures in Liquid Crystalline Rod-Coil Block Copolymers Kishore K. Tenneti of the tetragonal perforated layer structures in a series of rod- coil liquid crystalline block copolymers (BCPs microscopy (TEM) techniques were used to investigate these rod-coil molecules, and a perforated layer
Simulating Perforation of Thin Plates Using Molecular Dynamics Approach Anton M. Krivtsov
Krivtsov, Anton M.
1 Simulating Perforation of Thin Plates Using Molecular Dynamics Approach Anton M. Krivtsov or molecules, but as elements of the mesoscale level, such as material grains [4,5]. Fig.1: Oblique perforation of plate by ogive-nose projectile. This approach is used in the current work to simulate perforation
Strelniker, Yakov M.
Transmittance and transparency of subwavelength-perforated conducting films in the presence theoretically and numerically studied the transmission of light through a subwavelength-perforated metal film of a static magnetic field. Both the perforated and the homogeneous metal films are found to exhibit
Bruneau, Michel
Special Perforated Steel Plate Shear Walls with Reduced Beam Section Anchor Beams. I: Experimental presents results of an experimental investigation of specially detailed ductile perforated steel plate history of increasing displacements to a minimum drift of 3%. The perforated panel reduced the elastic
Numerical Investigation of the Acoustic Behavior of a Multi-perforated Liner
Eldredge, Jeff
Numerical Investigation of the Acoustic Behavior of a Multi-perforated Liner Jeff D. Eldredge, Stanford, CA, 94305, USA The acoustic response of a turbulent flow through an aperture in a multi-perforated, turbine, and the downstream-traveling sound created by the fan. In particular, multi-perforated liners
J. SPACECRAFT, VOL. 36, NO. 2: ENGINEERING NOTES 293 Fig. 2 Perforation into oblique plate.
Riabov, Vladimir V.
J. SPACECRAFT, VOL. 36, NO. 2: ENGINEERING NOTES 293 Fig. 2 Perforation into oblique plate. Oblique of perforation due to yaw alone into the oblique plate can be represented by Eq. (3), with P0 given by Eq. (1 of perforation vs range for combined pitching and yawing motion. With the plane of angular motion oriented 45 deg
Papamoschou, Dimitri
of Perforated Plates with Bias Flow Vincent Phong1 and Dimitri Papamoschou2 University of California, Irvine, CA perforated plates with bias flow. A theoretical model is proposed which characterizes the acoustic response downstream of the perforations. Experimental measurements of insertion loss are conducted in a specially
Large-Eddy Simulation of a Turbulent Flow around a Multi-Perforated Plate
Mendez, Simon
Large-Eddy Simulation of a Turbulent Flow around a Multi-Perforated Plate Simon Mendez1 , Franck and used in Reynolds-Averaged Navier-Stokes methods cannot predict momen- tum/heat transfer on perforated plate are reported. Large-Eddy Simulations of the flow created by an infinite multi-perforated plate
Two-parameter homogenization for a GL problem in a perforated domain
Berlyand, Leonid
Two-parameter homogenization for a GL problem in a perforated domain Leonid Berlyand(1) , Petru the notations: o = o, i = i so that A = o i. We next define a perforated domain A obtained by "punching" holes, a point x R2 and define Z = {m + x + P A}. Then the perforated domain is defined as follows: A = A \\ m
Special Perforated Steel Plate Shear Walls with Reduced Beam Section Anchor Beams. II: Analysis and
Bruneau, Michel
Special Perforated Steel Plate Shear Walls with Reduced Beam Section Anchor Beams. II: Analysis detailed ductile perforated steel plate shear walls SPSWs . These SPSWs had low yield strength steel infill, recommendations for the design of these special detailed perforated SPSWs are presented. DOI: 10.1061/ ASCE 0733
FINITE ELEMENT INVESTIGATION AND DESIGN RECOMMENDATIONS FOR PERFORATED STEEL PLATE SHEAR WALLS
Bruneau, Michel
FINITE ELEMENT INVESTIGATION AND DESIGN RECOMMENDATIONS FOR PERFORATED STEEL PLATE SHEAR WALLS of the behavior of unstiffened thin SPSW having a regular pattern of openings (a.k.a. perforated SPSW). Finite element monotonic pushover analyses were conducted, first on a series of individual perforated strips
Efficiency of perforated breakwater and associated energy dissipation
Ariyarathne, Hanchapola Appuhamilage
2008-10-10T23:59:59.000Z
The flow field behavior in the vicinity of a perforated breakwater and the efficiency of the breakwater under regular waves were studied. To examine the efficiency of the structure thirteen types of regular wave conditions with wave periods T = 1, 1...
Efficiency of perforated breakwater and associated energy dissipation
Ariyarathne, Hanchapola Appuhamilage
2009-05-15T23:59:59.000Z
The flow field behavior in the vicinity of a perforated breakwater and the efficiency of the breakwater under regular waves were studied. To examine the efficiency of the structure thirteen types of regular wave conditions with wave periods T = 1, 1...
Tubing pressurized firing apparatus for a tubing conveyed perforating gun
Davies, D. L.
1985-11-26T23:59:59.000Z
A tubing pressurized firing apparatus is shown for use with a tubing conveyed perforating gun of the type used to perforate a cased well bore. The firing apparatus has a tubular body with an upper end for connection in the well tubing string and with a lower end for connection to a well perforating gun. An inner mandrel is slidably mounted within the tubular body and has a ball seat formed in the interior bore thereof for receiving a ball dropped through the well tubing string. The ball and ball seat together form a pressure tight seal whereby tubing pressure in the well tubing string acts on the inner mandrel to slide the mandrel downwardly within the tubular body. A cocking mechanism located below the inner mandrel within the body includes a lockout member which is initially positioned between a detonating pin and a percussion detonator. The cocking mechanism is actuated by downward sliding movement of the inner mandrel to move the lockout member from between the detonating pin and percussion detonator whereby a subsequent release of tubing pressure and upward sliding movement of the inner mandrel exposes the detonating pin to the percussion detonator to actuate the detonator and fire the perforating gun.
Geometric control of failure behavior in perforated sheets
Michelle M. Driscoll
2014-11-20T23:59:59.000Z
Adding perforations to a continuum sheet allows new modes of deformation, and thus modifies its elastic behavior. The failure behavior of such a perforated sheet is explored, using a model experimental system: a material containing a one-dimensional array of rectangular holes. In this model system, a transition in failure mode occurs as the spacing and aspect ratio of the holes are varied: rapid failure via a running crack is completely replaced by quasi-static failure which proceeds via the breaking of struts at random positions in the array of holes. I demonstrate that this transition can be connected to the loss of stress enhancement which occurs as the material geometry is modified.
Apparatus and method for sealing perforated well casing
Blount, C.G.; Benham, R.A.; Brock, J.L.; Emerson, J.A.; Ferguson, K.R.; Scheve, D.F.; Schmidt, J.H.; Schuler, K.W.; Stanton, P.L.
1997-03-25T23:59:59.000Z
Perforations and other openings in well casings, liners and other conduits may be substantially blocked or sealed to prevent fluid flow between the casing or liner interior and an earth formation by placing a radially expansible sleeve adjacent the perforations or openings and urging the sleeve into forcible engagement with the casing or inner wall using an explosive charge. An apparatus including a radially contracted sleeve formed by a coiled plate member or a tubular member having flutes defined by external and internal folds, may be deployed into a well casing or liner through a production or injection tubing string and on the end of a flexible cable or coilable tubing. An explosive charge disposed on the apparatus and within the sleeve may be detonated to urge the sleeve into forcible engagement with the casing inner wall. 17 figs.
INVERSE PROBLEMS FOR EINSTEIN MANIFOLDS 1. Introduction ...
2008-12-11T23:59:59.000Z
principle is that Einstein's equation becomes a non-linear elliptic system with real ...... manifolds with boundary, Communications in Analysis and Geometry 11 ...
Temperature Driven Annealing of Perforations in Bicellar Model Membranes
Nieh, Mu-Ping [University of Connecticut, Storrs; Raghunathan, V.A. [Raman Research Institute, India; Pabst, Georg [Austrian Academy of Sciences, Graz, Austria; Harroun, Thad [Brock University, St. Catharines, ON, Canada; Nagashima, K [University of Toronto, Mississauga, ON, Canada; Morales, H [University of Toronto, Mississauga, ON, Canada; Katsaras, John [ORNL; Macdonald, P [University of Toronto, Mississauga, ON, Canada
2011-01-01T23:59:59.000Z
Bicellar model membranes composed of 1,2-dimyristoylphosphatidylcholine (DMPC) and 1,2-dihexanoylphosphatidylcholine (DHPC), with a DMPC/DHPC molar ratio of 5, and doped with the negatively charged lipid 1,2-dimyristoylphosphatidylglycerol (DMPG), at DMPG/DMPC molar ratios of 0.02 or 0.1, were examined using small angle neutron scattering (SANS), {sup 31}P NMR, and {sup 1}H pulsed field gradient (PFG) diffusion NMR with the goal of understanding temperature effects on the DHPC-dependent perforations in these self-assembled membrane mimetics. Over the temperature range studied via SANS (300-330 K), these bicellar lipid mixtures exhibited a well-ordered lamellar phase. The interlamellar spacing d increased with increasing temperature, in direct contrast to the decrease in d observed upon increasing temperature with otherwise identical lipid mixtures lacking DHPC. {sup 31}P NMR measurements on magnetically aligned bicellar mixtures of identical composition indicated a progressive migration of DHPC from regions of high curvature into planar regions with increasing temperature, and in accord with the 'mixed bicelle model' (Triba, M. N.; Warschawski, D. E.; Devaux, P. E. Biophys. J.2005, 88, 1887-1901). Parallel PFG diffusion NMR measurements of transbilayer water diffusion, where the observed diffusion is dependent on the fractional surface area of lamellar perforations, showed that transbilayer water diffusion decreased with increasing temperature. A model is proposed consistent with the SANS, {sup 31}P NMR, and PFG diffusion NMR data, wherein increasing temperature drives the progressive migration of DHPC out of high-curvature regions, consequently decreasing the fractional volume of lamellar perforations, so that water occupying these perforations redistributes into the interlamellar volume, thereby increasing the interlamellar spacing.
Regier, Terry
Poverty of the Stimulus? A Rational Approach Amy Perfors1 (perfors@mit.edu), Joshua B. Tenenbaum1, MIT; 2 Department of Psychology, University of Chicago Abstract The Poverty of the Stimulus (Po that these generalizations can best be explained by innate knowledge, known as the argument from the Poverty of the Stimulus
Perforated plates for cryogenic regenerators and method of fabrication
Hendricks, J.B.
1994-03-29T23:59:59.000Z
Perforated plates having very small holes with a uniform diameter throughout the plate thickness are prepared by a [open quotes]wire drawing[close quotes] process in which a billet of sacrificial metal is disposed in an extrusion can of the plate metal, and the can is extruded and restacked repeatedly, converting the billet to a wire of the desired hole diameter. At final size, the rod is then sliced into wafers, and the wires are removed by selective etching. This process is useful for plate metals of interest for high performance regenerator applications, in particular, copper, niobium, molybdenum, erbium, and other rare earth metals. Er[sub 3]Ni, which has uniquely favorable thermophysical properties for such applications, may be incorporated in regions of the plates by providing extrusion cans containing erbium and nickel metals in a stacked array with extrusion cans of the plate metal, which may be copper. The array is heated to convert the erbium and nickel metals to Er[sub 3]Ni. Perforated plates having two sizes of perforations, one of which is small enough for storage of helium, are also disclosed. 10 figures.
Perforated plates for cryogenic regenerators and method of fabrication
Hendricks, John B. (Huntsville, AL)
1994-01-01T23:59:59.000Z
Perforated plates (10) having very small holes (14) with a uniform diameter throughout the plate thickness are prepared by a "wire drawing" process in which a billet of sacrificial metal is disposed in an extrusion can of the plate metal, and the can is extruded and restacked repeatedly, converting the billet to a wire of the desired hole diameter. At final size, the rod is then sliced into wafers, and the wires are removed by selective etching. This process is useful for plate metals of interest for high performance regenerator applications, in particular, copper, niobium, molybdenum, erbium, and other rare earth metals. Er.sub.3 Ni, which has uniquely favorable thermophysical properties for such applications, may be incorporated in regions of the plates by providing extrusion cans (20) containing erbium and nickel metals in a stacked array (53) with extrusion cans of the plate metal, which may be copper. The array is heated to convert the erbium and nickel metals to Er.sub.3 Ni. Perforated plates having two sizes of perforations (38, 42), one of which is small enough for storage of helium, are also disclosed.
Simplicial isotopies in 3-manifolds
O'Donnell, Daniel Francis
1974-01-01T23:59:59.000Z
by Treybig [6] of a theorem by Moise [3]. To prove it, we need the following lemma and theorem. Lemma 3. 1. Let P be a polyhedral 2-sphere and let L (u) p be a family of planes in E normal to a given unit vector u so that (a) the vertices of P are a.... E. E. MOise, Affine structures in 3-manifoMs. II. Positional properties of 2-spheres, Ann. of Math. 55(1952), 172 - 176. 4. D. E. Sanderson, Isotopy in 3-manifolds. I. Isotopic deform- mations of 2-cells and 3-cells, Proc. Amer. Math. Soc. 8...
Method and apparatus for perforating at cutting with a solid fueled gas mixture
Woytek, A.J.; Lileck, J.T.; Steigerwalt, E.J.
1984-05-08T23:59:59.000Z
A method for cutting pipe casings and concrete liners or perforating the same and localized portions of surrounding strata in an earth bore is set forth wherein a gas phase cutting or perforating jet mixture of fluorine and nitrogen trifluoride is delivered to the cutting or perforation site from the decomposition of a solid, normally stable, perfluoroammonium salt. An appropriate apparatus for delivering the gas mixture of fluorine and nitrogen trifluoride from the salt is also disclosed.
Magnetic Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold Flooding During Continuous Fuel Cell Operation. Magnetic Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold...
Cottle, John Ernest
1948-01-01T23:59:59.000Z
of the question. Other difficulties encountered. in the use of large packed columns are the tendeno1es of the liquid to channel through the paoking and. of the packing to break down under high operating temperatures. Hubble cap plate columns are the most...- oulty in a perforated. plate column than in any other types' and. should oleaning 'be necessary it could, be aocomplished much more easily. It is also believed that high plate efficienoies could be o'btained with per- i'orated plates 'beoause...
Viscosity method for Homogenization of Parabolic Nonlinear Equations in Perforated Domains
Kim, Sunghoon
2011-01-01T23:59:59.000Z
In this paper, we develop a viscosity method for Homogenization of Nonlinear Parabolic Equations constrained by highly oscillating obstacles or Dirichlet data in perforated domains. The Dirichlet data on the perforated domain can be considered as a constraint or an obstacle. Homogenization of nonlinear eigen value problems has been also considered to control the degeneracy of the Porous medium equation in perforated domains. For the simplicity, we consider obstacles that consist of cylindrical columns distributed periodically and perforated domains with punctured balls. If the decay rate of the capac- ity of columns or the capacity of punctured ball is too high or too small, the limit of u\\k{o} will converge to trivial solutions. The critical decay rates of having nontrivial solution are obtained with the construction of barriers. We also show the limit of u\\k{o} satisfies a homogenized equation with a term showing the effect of the highly oscillating obstacles or perforated domain in viscosity sense.
Mode Evolution and Transmission Suppression in a Perforated Ultrathin Metallic Film in a perforated ultrathin metallic film (PUMF) with a periodic triangular array of holes. It is found for the future studies in PUMF-based structures and devices. Keywords Surface plasmon . Perforated ultrathin
Anomalous Near-Field Heat Transfer between a Cylinder and a Perforated Surface Alejandro W between a cylinder and a perforated surface depends nonmonotonically on their separation. This anomalous between a cylinder (or elongated object) and a perforated surface (e.g., a ring) can vary nonmonotonically
Mechanical seal having a single-piece, perforated mating ring
Khonsari, Michael M. (Baton Rouge, LA); Somanchi, Anoop K. (Fremont, CA)
2007-08-07T23:59:59.000Z
A mechanical seal (e.g., single mechanical seals, double mechanical seals, tandem mechanical seals, bellows, pusher mechanical seals, and all types of rotating and reciprocating machines) with reduced contact surface temperature, reduced contact surface wear, or increased life span. The mechanical seal comprises a rotating ring and a single-piece, perforated mating ring, which improves heat transfer by controllably channeling coolant flow through the single-piece mating ring such that the coolant is in substantially uniform thermal contact with a substantial portion of the interior surface area of the seal face, while maintaining the structural integrity of the mechanical seal and minimizing the potential for coolant flow interruptions to the seal face caused by debris or contaminants (e.g., small solids and trash) in the coolant.
Gauge Theories in Noncommutative Homogeneous Kähler Manifolds
Yoshiaki Maeda; Akifumi Sako; Toshiya Suzuki; Hiroshi Umetsu
2014-09-07T23:59:59.000Z
We construct a gauge theory on a noncommutative homogeneous K\\"ahler manifold, where we employ the deformation quantization with separation of variables for K\\"ahler manifolds formulated by Karabegov. A key point in this construction is to obtaining vector fields which act as inner derivations for the deformation quantization. We show that these vector fields are the only Killing vector fields. We give an explicit construction of this gauge theory on noncommutative ${\\mathbb C}P^N$ and noncommutative ${\\mathbb C}H^N$.
SUSY gauge theory on graded manifolds
G. Sardanashvily; W. Wachowski
2014-06-24T23:59:59.000Z
Lagrangian classical field theory of even and odd fields is adequately formulated in terms of fibre bundles and graded manifolds. In particular, conventional Yang-Mills gauge theory is theory of connections on smooth principal bundles, but its BRST extension involves odd ghost fields an antifields on graded manifolds. Here, we formulate Yang-Mills theory of Grassmann-graded gauge fields associated to Lie superalgebras on principal graded bundles. A problem lies in a geometric definition of odd gauge fields. Our goal is Yang--Mills theory of graded gauge fields and its BRST extension.
Stiefel and Grassmann manifolds in Quantum Chemistry
Eduardo Chiumiento; Michael Melgaard
2011-05-09T23:59:59.000Z
We establish geometric properties of Stiefel and Grassmann manifolds which arise in relation to Slater type variational spaces in many-particle Hartree-Fock theory and beyond. In particular, we prove that they are analytic homogeneous spaces and submanifolds of the space of bounded operators on the single-particle Hilbert space. As a by-product we obtain that they are complete Finsler manifolds. These geometric properties underpin state-of-the-art results on existence of solutions to Hartree-Fock type equations.
Anomalous Near-Field Heat Transfer between a Cylinder and a Perforated Surface
Rodriguez-Wong, Alejandro
We predict that the near-field radiative heat-transfer rate between a cylinder and a perforated surface depends nonmonotonically on their separation. This anomalous behavior, which arises due to evanescent-wave effects, ...
Numerical simulations of perforated plate stabilized premixed flames with detailed chemistry
Kedia, Kushal Sharad
2010-01-01T23:59:59.000Z
The objective of this work is to develop a high efficiency two-dimensional reactive flow solver to investigate perforated-plate stabilized laminar premixed flames. The developed code is used to examine the impact of the ...
Localization effect for a spectral problem in a perforated domain with Fourier boundary cconditions
Valeria Chiado Piat; Iryna Pankratova; Andrey Piatnitski
2012-11-16T23:59:59.000Z
We consider a homogenization of elliptic spectral problem stated in a perforated domain, Fourier boundary conditions being imposed on the boundary of perforation. The presence of a locally periodic coefficient in the boundary operator gives rise to the effect of a localization of the eigenfunctions. Moreover, the limit behaviour of the lower part of the spectrum can be described in terms of an auxiliary harmonic oscillator operator. We describe the asymptotics of the eigenpairs and derive the estimates for the rate of convergence.
A study of the effects of casing perforations on the production rates of wells
Sanderlin, James Lewis
1958-01-01T23:59:59.000Z
Resistance Values Used to Sinulate Well Bore plus Perfo'rations ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ o ~ ~ ~ ~ ~ $2 III Resistance Values Neasured Using Electrolytic Tank and Conductivity Bridge . . . ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ IV Resistance Values for Plush Perforations 34... coetsat by: ~ ad of Defer ?t AuSest 1958 TRBUL OP CONTEIES introduction snd Review of Literature Materials and Iquipaent . Procedure 6 Electrolytic Tank Electrical dnaloS Model Results snd Discussion of Results 10 Conclusions . *cknowled...
MATH 132: TOPOLOGY II: SMOOTH MANIFOLDS ANDREW COTTON-CLAY
Cotton-Clay, Andrew
MATH 132: TOPOLOGY II: SMOOTH MANIFOLDS ANDREW COTTON-CLAY 1. Introduction My Name: Andrew Cotton-Clay
Manifold gasket accommodating differential movement of fuel cell stack
Kelley, Dana A. (New Milford, CT); Farooque, Mohammad (Danbury, CT)
2007-11-13T23:59:59.000Z
A gasket for use in a fuel cell system having at least one externally manifolded fuel cell stack, for sealing the manifold edge and the stack face. In accordance with the present invention, the gasket accommodates differential movement between the stack and manifold by promoting slippage at interfaces between the gasket and the dielectric and between the gasket and the stack face.
Einstein Manifolds and Contact Geometry Charles P. Boyer Krzysztof Galicki
Einstein Manifolds and Contact Geometry Charles P. Boyer Krzysztof Galicki Abstract. We show that every KÂcontact Einstein manifold is SasakianÂEinstein and discuss several corollaries of this result. 1 types of Riemannian contact manifolds to construct Einstein metrics of positive scalar curvature
Drilling long geodesics in hyperbolic 3-manifolds K. Bromberg
Bromberg, Kenneth
Drilling long geodesics in hyperbolic 3-manifolds K. Bromberg September 22, 2006 1 Introduction to such a deformation as drilling and results which compare the geometry of the original manifold to the geometry of the drilled manifold as drilling theorems. The first results of this type are due to Hodgson and Kerckhoff
Test Report for Perforated Metal Air Transportable Package (PMATO) Prototype.
Bobbe, Jeffery G.; Pierce, Jim Dwight
2003-06-01T23:59:59.000Z
A prototype design for a plutonium air transport package capable of carrying 7.6 kg of plutonium oxide and surviving a ''worst-case'' plane crash has been developed by Sandia National Laboratories (SNL) for the Japan Nuclear Cycle Development Institute (JNC). A series of impact tests were conducted on half-scale models of this design for side, end, and comer orientations at speeds close to 282 m/s onto a target designed to simulate weathered sandstone. These tests were designed to evaluate the performance of the overpack concept and impact-limiting materials in critical impact orientations. The impact tests of the Perforated Metal Air Transportable Package (PMATP) prototypes were performed at SNL's 10,000-ft rocket sled track. This report describes test facilities calibration and environmental testing methods of the PMATP under specific test conditions. The tests were conducted according to the test plan and procedures that were written by the authors and approved by SNL management and quality assurance personnel. The result of these tests was that the half-scale PMATP survived the ''worst-case'' airplane crash conditions, and indicated that a full-scale PMATP, utilizing this overpack concept and these impact-limiting materials, would also survive these crash conditions.
Energy-momentum balance in particle - domain wall perforating collision
D. V. Gal'tsov; E. Yu. Melkumova; P. A. Spirin
2015-02-10T23:59:59.000Z
We investigate the energy-momentum balance in the perforating collision of a point particle with an infinitely thin planar domain wall within the linearized gravity in arbitrary dimensions. Since the metric of the wall increases with distance, the wall and the particle are never free, and their energy-momentum balance involves not only the instantaneous kinetic momenta, but also the non-local contribution of gravitational stresses. However, careful analysis shows that the stresses can be unambiguously divided between the colliding objects leading to definition of the gravitationally dressed momenta. These take into account for gravity in the same way as the potential energy does in the non-relativistic theory, but our treatment is fully relativistic. Another unusual feature of our problem is the non-vanishing flux of the total energy-momentum tensor through the lateral surface of the world tube. In this case the zero divergence of the energy-momentum tensor does not imply conservation of the total momentum defined as the integral over the space-like section of the tube. But one can still define the conservation low infinitesimally, passing to time derivatives of the momenta. Using this definition we establish the momentum balance in terms of the dressed particle and wall momenta.
Large-Scale Manifold Learning Ameet Talwalkar
California at Irvine, University of
Large-Scale Manifold Learning Ameet Talwalkar Courant Institute New York, NY ameet on spectral decom- position, we first analyze two approximate spectral decom- position techniques for large-dimensional embeddings for two large face datasets: CMU-PIE (35 thousand faces) and a web dataset (18 million faces). Our
DIRECT SEARCH METHODS OVER LIPSCHITZ MANIFOLDS 1 ...
2007-02-27T23:59:59.000Z
Page 1 ... (implicit) function theorem allows us to define a new problem on the tangent spaces of the manifold. .... modification to our algorithm in Procedure 2.1, though now the convergence analysis is done in TxM. .... First we'll concern ourselves with finding the implicit function ?(0, w). What ... The reason is, we don'
Collisions at infinity in hyperbolic manifolds
McReynolds, D B; Stover, Matthew
2012-01-01T23:59:59.000Z
For a complete, finite volume real hyperbolic n-manifold M, we investigate the map between homology of the cusps of M and the homology of $M$. Our main result provides a proof of a result required in a recent paper of Frigerio, Lafont, and Sisto.
A Generalized Construction of Mirror Manifolds
P. Berglund; T. Hübsch
1992-01-09T23:59:59.000Z
We generalize the known method for explicit construction of mirror pairs of $(2,2)$-superconformal field theories, using the formalism of Landau-Ginzburg orbifolds. Geometrically, these theories are realized as Calabi-Yau hypersurfaces in weighted projective spaces. This generalization makes it possible to construct the mirror partners of many manifolds for which the mirror was not previously known.
NUMERICAL CONSTRAINTS FOR EMBEDDED PROJECTIVE MANIFOLDS
Besana, Gian Mario
an n- fold X in P2n is related to the number of double points of a generic projection of X from P2n+1. Double point formulas, expressing these constraints in terms of Chern classes of the manifolds and its case of the Laksov-Todd double point formula, [37]. An excellent general reference is due to Kleiman
Towards a double field theory on para-Hermitian manifolds
Vaisman, Izu [Department of Mathematics, University of Haifa, Haifa (Israel)] [Department of Mathematics, University of Haifa, Haifa (Israel)
2013-12-15T23:59:59.000Z
In a previous paper, we have shown that the geometry of double field theory has a natural interpretation on flat para-Kähler manifolds. In this paper, we show that the same geometric constructions can be made on any para-Hermitian manifold. The field is interpreted as a compatible (pseudo-)Riemannian metric. The tangent bundle of the manifold has a natural, metric-compatible bracket that extends the C-bracket of double field theory. In the para-Kähler case, this bracket is equal to the sum of the Courant brackets of the two Lagrangian foliations of the manifold. Then, we define a canonical connection and an action of the field that correspond to similar objects of double field theory. Another section is devoted to the Marsden-Weinstein reduction in double field theory on para-Hermitian manifolds. Finally, we give examples of fields on some well-known para-Hermitian manifolds.
Connections on non-symmetric (generalized) Riemannian manifold and gravity
Ivanov, Stefan
2015-01-01T23:59:59.000Z
Connections with (skew-symmetric) torsion on non-symmetric Riemannian manifold satisfying the Einstein metricity condition (NGT with torsion) are considered. It is shown that an almost Hermitian manifold is an NGT with torsion if and only if it is a Nearly K\\"ahler manifold. In the case of an almost contact metric manifold the NGT with torsion spaces are characterized and a possibly new class of almost contact metric manifolds is extracted. Similar considerations lead to a definition of a particular classes of almost para-Hermitian and almost paracontact metric manifolds. The conditions are given in terms of the corresponding Nijenhuis tensors and the exterior derivative of the skew-symmetric part of the non-symmetric Riemannian metric.
Denis Borisov; Giuseppe Cardone; Tiziana Durante
2015-03-21T23:59:59.000Z
We consider an infinite planar straight strip perforated by small holes along a curve. In such domain, we consider a general second order elliptic operator subject to classical boundary conditions on the holes. Assuming that the perforation is non-periodic and satisfies rather weak assumptions, we describe all possible homogenized problems. Our main result is the norm resolvent convergence of the perturbed operator to a homogenized one in various operator norms and the estimates for the rate of convergence. On the basis of the norm resolvent convergence, we prove the convergence of the spectrum.
Permeability through a perforated domain for the incompressible 2D Euler equations
Virginie Bonnaillie-Noël; Christophe Lacave; Nader Masmoudi
2013-06-17T23:59:59.000Z
We investigate the influence of a perforated domain on the 2D Euler equations. Small inclusions of size $\\varepsilon$ are uniformly distributed on the unit segment or a rectangle, and the fluid fills the exterior. These inclusions are at least separated by a distance $\\varepsilon^\\alpha$ and we prove that for $\\alpha$ small enough (namely, less than 2 in the case of the segment, and less than 1 in the case of the square), the limit behavior of the ideal fluid does not feel the effect of the perforated domain at leading order when $\\varepsilon\\to 0$.
Computation of the Flow of a Dual-Stream Jet with External Solid and Perforated Wedge Deflectors for
Papamoschou, Dimitri
Computation of the Flow of a Dual-Stream Jet with External Solid and Perforated Wedge Deflectors used as wedge-shaped fan flow deflectors for reducing jet noise of a supersonic turbofan engine of the external jet plume with solid and perforated deflector flaps, the latter with 50% porosity. Flow
The Yamabe equation on complete manifolds with finite volume
Große, Nadine
2011-01-01T23:59:59.000Z
We prove the existence of a solution of the Yamabe equation on complete manifolds with finite volume and positive Yamabe invariant. In order to circumvent the standard methods on closed manifolds which heavily rely on global (compact) Sobolev embeddings we approximate the solution by eigenfunctions of certain conformal complete metrics. This also gives rise to a new proof of the well-known result for closed manifolds and positive Yamabe invariant.
The genus spectrum of a hyperbolic 3-manifold
McReynolds, D B
2009-01-01T23:59:59.000Z
In this article we study the spectrum of totally geodesic surfaces of a finite volume hyperbolic 3-manifold. We show that for arithmetic hyperbolic 3-manifolds that contain a totally geodesic surface, this spectrum determines the commensurability class. In addition, we show that any finite volume hyperbolic 3-manifold has many pairs of non-isometric finite covers with identical spectra. Forgetting multiplicities, we can also construct pairs where the volume ratio is unbounded.
Marrucci, Lorenzo
SUMMARY Recently published international rankings indicate that the perfor- mance gap between with the research perfor- mance of its universities. Europe invests too little in higher education. It is generally
Hebard, Arthur F.
Trapped Electromagnetic Modes and Scaling in the Transmittance of Perforated Metal Films S. Selcuk that light would not be transmitted by a metal film perforated by a set of holes with size smaller than
Mathematical definition of quantum field theory on a manifold
A. V. Stoyanovsky
2009-11-21T23:59:59.000Z
We give a mathematical definition of quantum field theory on a manifold, and definition of quantization of a classical field theory given by a variational principle.
Engine Air Intake Manifold Having Built In Intercooler
Freese, V, Charles E. (Westland, MI)
2000-09-12T23:59:59.000Z
A turbocharged V type engine can be equipped with an exhaust gas recirculation cooler integrated into the intake manifold, so as to achieve efficiency, cost reductions and space economization improvements. The cooler can take the form of a tube-shell heat exchanger that utilizes a cylindrical chamber in the air intake manifold as the heat exchanger housing. The intake manifold depends into the central space formed by the two banks of cylinders on the V type engine, such that the central space is effectively utilized for containing the manifold and cooler.
Optical manifold for light-emitting diodes
Chaves, Julio C.; Falicoff, Waqidi; Minano, Juan C.; Benitez, Pablo; Parkyn, Jr., William A.; Alvarez, Roberto; Dross, Oliver
2008-06-03T23:59:59.000Z
An optical manifold for efficiently combining a plurality of blue LED outputs to illuminate a phosphor for a single, substantially homogeneous output, in a small, cost-effective package. Embodiments are disclosed that use a single or multiple LEDs and a remote phosphor, and an intermediate wavelength-selective filter arranged so that backscattered photoluminescence is recycled to boost the luminance and flux of the output aperture. A further aperture mask is used to boost phosphor luminance with only modest loss of luminosity. Alternative non-recycling embodiments provide blue and yellow light in collimated beams, either separately or combined into white.
Subsea Manifolds Market | OpenEI Community
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a g eWorks -09-0018-CXNuonYucheng XinyuanStresni Burza S R O Jump to: navigation,Subsea Manifolds
Random homogenization of p-Laplacian with obstacles in perforated domain
Tang, Lan
2010-01-01T23:59:59.000Z
In this paper,we will study the homogenization of $p$-Laplacian with obstacles in perforated domain, where the holes are periodically distributed and have random size. And we also assume that the $p$-capacity of each hole is stationary ergodic.
Douanla, Hermann Yonta
2011-01-01T23:59:59.000Z
Spectral asymptotics of linear periodic elliptic operators with indefinite (sign-changing) density function is investigated in perforated domains with the two-scale convergence method. The limiting behavior of positive and negative eigencouples depends crucially on whether the average of the weight over the solid part is positive, negative or equal to zero. We prove concise homogenization results in all three cases.
Hermann Yonta Douanla
2012-08-21T23:59:59.000Z
Spectral asymptotics of linear periodic elliptic operators with indefinite (sign-changing) density function is investigated in perforated domains with the two-scale convergence method. The limiting behavior of positive and negative eigencouples depends crucially on whether the average of the weight over the solid part is positive, negative or equal to zero. We prove concise homogenization results in all three cases.
On the effect of perforated plates on the acoustics of annular combustors
Nicoud, Franck
the influence of perforated plates on the acoustic modes in aeronautical gas turbines combustion chambers quantity I. Introduction In order to cut down pollutant emissions, industrial gas turbine combustion and dilution holes [14, 15]. In aeronautical gas turbines, walls of recent combustion chambers are generally
An adiabatic homogeneous model for the flow around a multi-perforated plate
Mendez, Simon
in industrial full-scale computations of gas turbine combustion chambers, where effusion cooling is commonly to the suction side I. Introduction and objectives In gas turbines, the turbine blades and the liner homogeneous model to account for multi-perforated lin- ers in combustion chamber flow simulations is described
A construction of a nonparametric quantum information manifold
Anna Jencova
2005-11-21T23:59:59.000Z
We present a construction of a Banach manifold on the set of faithful normal states of a von Neumann algebra, where the underlying Banach space is a quantum analogue of an Orlicz space. On the manifold, we introduce the exponential and mixture connections as dual pair of affine connections.
Manifold to uniformly distribute a solid-liquid slurry
Kern, Kenneth C. (Lake Hiawatha, NJ)
1983-01-01T23:59:59.000Z
This invention features a manifold that divides a stream of coal particles and liquid into several smaller streams maintaining equal or nearly equal mass compositions. The manifold consists of a horizontal, variable area header having sharp-edged, right-angled take-offs which are oriented on the bottom of the header.
Einstein manifolds with convex boundaries JeanMarc Schlenker \\Lambda
Schlenker, Jean-Marc
Einstein manifolds with convex boundaries JeanÂMarc Schlenker \\Lambda February 2, 1999 Abstract Let (M; @M) be a compact m+1Âmanifold with boundary with an Einstein metric g 0 , with ric g0 = \\Gammamg metric on @M . Then any metric close enough to h 0 is induced on @M by an Einstein metric g with ric g
Einstein manifolds with convex boundaries Jean-Marc Schlenker*
Schlenker, Jean-Marc
Einstein manifolds with convex boundaries Jean Let (M, @M) be a compact m+1-manifold with boundary with an Einstein me* *tric g0, with ricg0 be the induced metric on @M. Then any metric close e* *nough to h0 is induced on @M by an Einstein metric g
General relativity calculus with SageManifolds Eric Gourgoulhon1
Gourgoulhon, Eric
, Poland http://users.camk.edu.pl/bejger/ CoCoNuT Meeting 2013 Observatoire de Paris, Meudon 4 December 2013 ´Eric Gourgoulhon, Michal Bejger (LUTH, CAMK) SageManifolds CoCoNuT Meeting, 4 Dec. 2013 1 / 21 Gourgoulhon, Michal Bejger (LUTH, CAMK) SageManifolds CoCoNuT Meeting, 4 Dec. 2013 2 / 21 #12;An overview
ASYMPTOTIC PROPERTIES OF THE HEAT KERNEL ON CONIC MANIFOLDS
Loya, Paul
ASYMPTOTIC PROPERTIES OF THE HEAT KERNEL ON CONIC MANIFOLDS PAUL LOYA Abstract. We derive Foundation Fellowship. 1 #12; 2 PAUL LOYA Trace expansions of cone operators has a long history stemming from on conic manifolds; see for instance, Callias [5], Cheeger [7], Chou [9], BrË?uning--Seeley [3], Br
NASH-STAMPACCHIA EQUILIBRIUM POINTS ON MANIFOLDS ALEXANDRU KRISTALY
NASH-STAMPACCHIA EQUILIBRIUM POINTS ON MANIFOLDS ALEXANDRU KRIST´ALY Abstract. Motivated by Nash equilibrium problems on 'curved' strategy sets, the concept of Nash-Stampacchia equilibrium points Riemannian manifolds. Characterization, existence, and stability of Nash- Stampacchia equilibria are studied
Dual manifold system and method for fluid transfer
Doktycz, Mitchel J. (Knoxville, TN); Bryan, William Louis (Knoxville, TN); Kress, Reid (Oak Ridge, TN)
2003-05-27T23:59:59.000Z
A dual-manifold assembly is provided for the rapid, parallel transfer of liquid reagents from a microtiter plate to a solid state microelectronic device having biological sensors integrated thereon. The assembly includes aspiration and dispense manifolds connected by a plurality of conduits. In operation, the aspiration manifold is actuated such that the aspiration manifold is seated onto an array of reagent-filled wells of the microtiter plate. The wells are pressurized to force reagent through conduits toward the dispense manifold. A pressure pulse provided by a standard ink-jet printhead ejects nanoliter-to-picoliter droplets of reagent through an array of printhead orifices and onto test sites on the surface of the microelectronic device.
Dual manifold system and method for fluid transfer
Doktycz, Mitchel J.; Bryan, William Louis; Kress, Reid
2003-09-30T23:59:59.000Z
A dual-manifold assembly is provided for the rapid, parallel transfer of liquid reagents from a microtiter plate to a solid state microelectronic device having biological sensors integrated thereon. The assembly includes aspiration and dispense manifolds connected by a plurality of conduits. In operation, the aspiration manifold is actuated such that the aspiration manifold is seated onto an array of reagent-filled wells of the microtiter plate. The wells are pressurized to force reagent through conduits toward the dispense manifold. A pressure pulse provided by a standard ink-jet printhead ejects nanoliter-to-picoliter droplets of reagent through an array of printhead orifices and onto test sites on the surface of the microelectronic device.
Rough Solutions of the Einstein Constraints on Closed Manifolds without Near-CMC Conditions
Holst, Michael; Nagy, Gabriel; Tsogtgerel, Gantumur
2009-01-01T23:59:59.000Z
global) sub- and super-solution constructions for closed manifolds; analogous constructions for compactof compact manifolds with boundary. Lemma 7 (Global super-
Manifold corrections on spinning compact binaries
Zhong Shuangying; Wu Xin [Nanchang University, Nanchang 330031 (China)
2010-05-15T23:59:59.000Z
This paper deals mainly with a discussion of three new manifold correction methods and three existing ones, which can numerically preserve or correct all integrals in the conservative post-Newtonian Hamiltonian formulation of spinning compact binaries. Two of them are listed here. One is a new momentum-position scaling scheme for complete consistency of both the total energy and the magnitude of the total angular momentum, and the other is the Nacozy's approach with least-squares correction of the four integrals including the total energy and the total angular momentum vector. The post-Newtonian contributions, the spin effects, and the classification of orbits play an important role in the effectiveness of these six manifold corrections. They are all nearly equivalent to correct the integrals at the level of the machine epsilon for the pure Kepler problem. Once the third-order post-Newtonian contributions are added to the pure orbital part, three of these corrections have only minor effects on controlling the errors of these integrals. When the spin effects are also included, the effectiveness of the Nacozy's approach becomes further weakened, and even gets useless for the chaotic case. In all cases tested, the new momentum-position scaling scheme always shows the optimal performance. It requires a little but not much expensive additional computational cost when the spin effects exist and several time-saving techniques are used. As an interesting case, the efficiency of the correction to chaotic eccentric orbits is generally better than one to quasicircular regular orbits. Besides this, the corrected fast Lyapunov indicators and Lyapunov exponents of chaotic eccentric orbits are large as compared with the uncorrected counterparts. The amplification is a true expression of the original dynamical behavior. With the aid of both the manifold correction added to a certain low-order integration algorithm as a fast and high-precision device and the fast Lyapunov indicators of two nearby trajectories, phase space scans for chaos in the spinning compact binary system are given.
Relativistic fluid mechanics, Kahler manifolds and supersymmetry
T. S. Nyawelo; J. W. van Holten; S. Groot Nibbelink
2003-09-11T23:59:59.000Z
We propose an alternative for the Clebsch decomposition of currents in fluid mechanics, in terms of complex potentials taking values in a Kahler manifold. We reformulate classical relativistic fluid mechanics in terms of these complex potentials and rederive the existence of an infinite set of conserved currents. We perform a canonical analysis to find the explicit form of the algebra of conserved charges. The Kahler-space formulation of the theory has a natural supersymmetric extension in 4-D space-time. It contains a conserved current, but also a number of additional fields complicating the interpretation. Nevertheless, we show that an infinite set of conserved currents emerges in the vacuum sector of the additional fields. This sector can therefore be identified with a regime of supersymmetric fluid mechanics. Explicit expressions for the current and the density are obtained.
Geometric solitons of Hamiltonian flows on manifolds
Song, Chong, E-mail: songchong@xmu.edu.cn [School of Mathematical Sciences, Xiamen University, Xiamen 361005 (China)] [School of Mathematical Sciences, Xiamen University, Xiamen 361005 (China); Sun, Xiaowei, E-mail: sunxw@cufe.edu.cn [School of Applied Mathematics, Central University of Finance and Economics, Beijing 100081 (China)] [School of Applied Mathematics, Central University of Finance and Economics, Beijing 100081 (China); Wang, Youde, E-mail: wyd@math.ac.cn [Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190 (China)] [Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190 (China)
2013-12-15T23:59:59.000Z
It is well-known that the LIE (Locally Induction Equation) admit soliton-type solutions and same soliton solutions arise from different and apparently irrelevant physical models. By comparing the solitons of LIE and Killing magnetic geodesics, we observe that these solitons are essentially decided by two families of isometries of the domain and the target space, respectively. With this insight, we propose the new concept of geometric solitons of Hamiltonian flows on manifolds, such as geometric Schrödinger flows and KdV flows for maps. Moreover, we give several examples of geometric solitons of the Schrödinger flow and geometric KdV flow, including magnetic curves as geometric Schrödinger solitons and explicit geometric KdV solitons on surfaces of revolution.
Andrey Piatnitski; Volodymyr Rybalko
2010-06-03T23:59:59.000Z
The paper deals with homogenization problem for nonlinear elliptic and parabolic equations in a periodically perforated domain, a nonlinear Fourier boundary conditions being imposed on the perforation border. Under the assumptions that the studied differential equation satisfies monotonicity and 2-growth conditions and that the coefficient of the boundary operator is centered at each level set of unknown function, we show that the problem under consideration admits homogenization and derive the effective model.
Piatnitski, Andrey
2010-01-01T23:59:59.000Z
The paper deals with homogenization problem for nonlinear elliptic and parabolic equations in a periodically perforated domain, a nonlinear Fourier boundary conditions being imposed on the perforation border. Under the assumptions that the studied differential equation satisfies monotonicity and 2-growth conditions and that the coefficient of the boundary operator is centered at each level set of unknown function, we show that the problem under consideration admits homogenization and derive the effective model.
Fixed points, stable manifolds, weather regimes, and their predictability
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Deremble, Bruno; D'Andrea, Fabio; Ghil, Michael
2009-10-27T23:59:59.000Z
In a simple, one-layer atmospheric model, we study the links between low-frequency variability and the model’s fixed points in phase space. The model dynamics is characterized by the coexistence of multiple ''weather regimes.'' To investigate the transitions from one regime to another, we focus on the identification of stable manifolds associated with fixed points. We show that these manifolds act as separatrices between regimes. We track each manifold by making use of two local predictability measures arising from the meteorological applications of nonlinear dynamics, namely, ''bred vectors'' and singular vectors. These results are then verified in the framework of ensemblemore »forecasts issued from clouds (ensembles) of initial states. The divergence of the trajectories allows us to establish the connections between zones of low predictability, the geometry of the stable manifolds, and transitions between regimes.« less
Fixed points, stable manifolds, weather regimes, and their predictability
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Deremble, Bruno [Laboratoire de Meteorologie Dynamique (CNRS and IPSL), Paris (France); D'Andrea, Fabio [Laboratoire de Meteorologie Dynamique (CNRS and IPSL), Paris (France); Ghil, Michael [Univ. of California, Los Angeles, CA (United Staes). Atmospheric and Oceanic Sciences and Inst. of Geophysics and Planetary Physics
2009-01-01T23:59:59.000Z
In a simple, one-layer atmospheric model, we study the links between low-frequency variability and the model’s fixed points in phase space. The model dynamics is characterized by the coexistence of multiple ''weather regimes.'' To investigate the transitions from one regime to another, we focus on the identification of stable manifolds associated with fixed points. We show that these manifolds act as separatrices between regimes. We track each manifold by making use of two local predictability measures arising from the meteorological applications of nonlinear dynamics, namely, ''bred vectors'' and singular vectors. These results are then verified in the framework of ensemble forecasts issued from clouds (ensembles) of initial states. The divergence of the trajectories allows us to establish the connections between zones of low predictability, the geometry of the stable manifolds, and transitions between regimes.
Fixed points, stable manifolds, weather regimes, and their predictability
Deremble, Bruno [Laboratoire de Meteorologie Dynamique (CNRS and IPSL), Paris (France); D'Andrea, Fabio [Laboratoire de Meteorologie Dynamique (CNRS and IPSL), Paris (France); Ghil, Michael [Univ. of California, Los Angeles, CA (United Staes). Atmospheric and Oceanic Sciences and Inst. of Geophysics and Planetary Physics
2009-10-27T23:59:59.000Z
In a simple, one-layer atmospheric model, we study the links between low-frequency variability and the model’s fixed points in phase space. The model dynamics is characterized by the coexistence of multiple ''weather regimes.'' To investigate the transitions from one regime to another, we focus on the identification of stable manifolds associated with fixed points. We show that these manifolds act as separatrices between regimes. We track each manifold by making use of two local predictability measures arising from the meteorological applications of nonlinear dynamics, namely, ''bred vectors'' and singular vectors. These results are then verified in the framework of ensemble forecasts issued from clouds (ensembles) of initial states. The divergence of the trajectories allows us to establish the connections between zones of low predictability, the geometry of the stable manifolds, and transitions between regimes.
Jacobi Fields on Statistical Manifolds of Negative Curvature
Carlo Cafaro; S. A. Ali
2007-02-14T23:59:59.000Z
Two entropic dynamical models are considered. The geometric structure of the statistical manifolds underlying these models is studied. It is found that in both cases, the resulting metric manifolds are negatively curved. Moreover, the geodesics on each manifold are described by hyperbolic trajectories. A detailed analysis based on the Jacobi equation for geodesic spread is used to show that the hyperbolicity of the manifolds leads to chaotic exponential instability. A comparison between the two models leads to a relation among statistical curvature, stability of geodesics and relative entropy-like quantities. Finally, the Jacobi vector field intensity and the entropy-like quantity are suggested as possible indicators of chaoticity in the ED models due to their similarity to the conventional chaos indicators based on the Riemannian geometric approach and the Zurek-Paz criterion of linear entropy growth, respectively.
3-MANIFOLDS, TANGLES AND PERSISTENT INVARIANTS JOZEF H. PRZYTYCKI
Silver, Dan
in the last section. We are grateful to J. Scott Carter, Mietek D¸abkowski and Seiichi Kamada for stimu3-MANIFOLDS, TANGLES AND PERSISTENT INVARIANTS J´OZEF H. PRZYTYCKI Department of Mathematics
Classification of Certain Compact Riemannian Manifolds with Harmonic Curvature a...
Derdzinski, Andrzej
Classification of Certain Compact Riemannian Manifolds with Harmonic Curvature a... Derdzinski and University Library provides access to digitized documents strictly for noncommercial educational, research) requires prior written permission from the Goettingen State- and University Library. Each copy of any part
The world problem: on the computability of the topology of 4-manifolds
James R. van Meter
2005-06-03T23:59:59.000Z
Topological classification of the 4-manifolds bridges computation theory and physics. A proof of the undecidability of the homeomorphy problem for 4-manifolds is outlined here in a clarifying way. It is shown that an arbitrary Turing machine with an arbitrary input can be encoded into the topology of a 4-manifold, such that the 4-manifold is homeomorphic to a certain other 4-manifold if and only if the corresponding Turing machine halts on the associated input. Physical implications are briefly discussed.
Homogenization of Steklov spectral problems with indefinite density function in perforated domains
Douanla, Hermann Yonta
2011-01-01T23:59:59.000Z
The asymptotic behavior of second order self-adjoint elliptic Steklov eigenvalue problems with periodic rapidly oscillating coefficients and with indefinite (sign-changing) density function is investigated in periodically perforated domains. We prove that the spectrum of this problem is discrete and consists of two sequences, one tending to -{\\infty} and another towards +{\\infty}. The limiting behavior of positive and negative eigencouples depends crucially on whether the average of the weight over the surface of the reference hole is positive, negative or equal to zero. By means of the two-scale convergence method, we prove concise homogenization results in all three cases.
Homogenization of Steklov spectral problems with indefinite density function in perforated domains
Hermann Yonta Douanla
2012-08-21T23:59:59.000Z
The asymptotic behavior of second order self-adjoint elliptic Steklov eigenvalue problems with periodic rapidly oscillating coefficients and with indefinite (sign-changing) density function is investigated in periodically perforated domains. We prove that the spectrum of this problem is discrete and consists of two sequences, one tending to -{\\infty} and another to +{\\infty}. The limiting behavior of positive and negative eigencouples depends crucially on whether the average of the weight over the surface of the reference hole is positive, negative or equal to zero. By means of the two-scale convergence method, we investigate all three cases.
Wei, Zeyong; Fan, Yuancheng; Yu, Xing; Li, Hongqiang
2011-01-01T23:59:59.000Z
This paper theoretically and experimentally presents a first report on broadband enhanced transmission through stacked metallic multi-layers perforated with coaxial annular apertures (CAAs). Different from previous studies on extraordinary transmission that occurs at a single frequency, the enhanced transmission of our system with two or three metallic layers can span a wide frequency range with a bandwidth about 60% of the central frequency. The phenomena arise from the excitation and hybridization of guided resonance modes in CAAs among different layers. Measured transmission spectra are in good agreement with calculations semi-analytically resolved by modal expansion method.
Flow and heat transfer in vertical annuli
Ulke, A.; Goldberg, I.
1993-11-01T23:59:59.000Z
In shell-side boiling heat exchangers narrow crevices that are formed between the tubes and the tube support structure provide areas for local conditions which differ significantly from the bulk fluid conditions. A quasi-two-dimensional model which was developed to describe the local phenomena in a vertical, cylindrical crevice was described previously. The present work compares experimentally obtained flow and tube temperature distributions to those predicted by the model. The results confirm the characteristic ``W`` shape of the tube temperature profile centered at the line contact between a heated tube and tube support.
First laboratory perforating tests in coal show lower-than-expected penetration
Snider, P.M.; Walton, I.C.; Skinner, T.K.; Atwood, D.C.; Grove, B.M.; Graham, C.
2008-06-15T23:59:59.000Z
Worldwide Coal Bed Methane (CBM) resources are huge, estimated at 3,000 to 9,000 Tcf. The production rate from CBM reservoirs is low, perhaps 50-100 mcf/day. Various completion methods are being evaluated and new technologies are being developed with the aim of increasing production rates. Considering this interest and activity level, little attention has been paid to the CBM completion fundamentals. Perforating is a critical part of this process, especially considering the PRB development migration from single-coal, open-hole completions into multi-zone, cased-hole completions. This paper describes the first known laboratory-testing program to investigate shaped charge penetration in coal targets. We describe mechanical properties of the coals tested, and penetration results for different shaped charges (of different designs), shot at various stress conditions. CT scan and cutaway imaging of the perforation tunnels are also discussed. Tests were conducted under dry and saturated conditions. The preliminary experiments reported here indicate that shaped charge penetration in coal is significantly less than expected, considering the target's density and strength. The authors provide insight into what may be the reasons for these unexpected results and recommend a path forward for shaped charge testing, designs, predictive tools, and how to optimize CBM completions.
Distributed mean curvature on a discrete manifold for Regge calculus
Rory Conboye; Warner A. Miller; Shannon Ray
2015-02-26T23:59:59.000Z
The integrated mean curvature of a simplicial manifold is well understood in both Regge Calculus and Discrete Differential Geometry. However, a well motivated pointwise definition of curvature requires a careful choice of volume over which to uniformly distribute the local integrated curvature. We show that hybrid cells formed using both the simplicial lattice and its circumcentric dual emerge as a remarkably natural structure for the distribution of this local integrated curvature. These hybrid cells form a complete tessellation of the simplicial manifold, contain a geometric orthonormal basis, and are also shown to give a pointwise mean curvature with a natural interpretation as a fractional rate of change of the normal vector.
Self-dual metrics on toric 4-manifolds: extending the Joyce construction
Griffiths, Hugh Norman
2009-01-01T23:59:59.000Z
Toric geometry studies manifolds M2n acted on effectively by a torus of half their dimension, Tn. Joyce shows that for such a 4-manifold sufficient conditions for a conformal class of metrics on the free part of the ...
Schneider, Glenn
on instrument perfor- mance John W. MacKenty, Glenn Schneider*, Sylvia M. Baggett, Dana D. Mitchell, Christine E
ALMOST JET STRUCTURES AND FIRST JET-EXTENSIONS OF FIBRED MANIFOLDS
Pasquero, Stefano
ALMOST JET STRUCTURES AND FIRST JET-EXTENSIONS OF FIBRED MANIFOLDS Paola Morando Dipartimento di conditions for a manifold M to be diffeomorphic to the first jetextension j1(N) of a fibred manifold N O are given in terms of almost jet structures, i.e. pairs (S, A), where S is a suitable type (2, 1) tensor
An implicit trust-region method on Riemannian manifolds§
2007-06-06T23:59:59.000Z
Jun 6, 2007 ... described in terms of optimizing a smooth function on a manifold (e.g., the eigen- value problem .... Use CG recurrences to update residual and search direction. 21: Set rj+1 = rj .... only once and never re-enter it. However, for ...
Geodesic Regression on Riemannian Manifolds P. Thomas Fletcher
Boyer, Edmond
- ing multiple linear regression in Rn . Here we are interested in the relationship between a non that one could choose, and it provides a direct generalization of linear regression to the manifold setting regression model is linear regression, due to its simplicity, ease of interpretation, and ability to model
Energy-Minimizing Splines in Manifolds Michael Hofer
Pottmann, Helmut
Energy-Minimizing Splines in Manifolds Michael Hofer Vienna Univ. of Technology Helmut Pottmann Vienna Univ. of Technology Abstract Variational interpolation in curved geometries has many applica of surfaces. This list is more comprehensive than it looks, because it includes variational motion design
nlin.PS/0201047 Unstable manifolds and Schrodinger dynamics
Schroers, Bernd J.
, United Kingdom January 2002 Abstract The time evolution of several interacting Ginzburg-Landau vortices to the unit circle in C . It therefore has an associated integer winding number or degree, which can of the Ginzburg-Landau energy functional. For two vortices the relevant un- stable manifold is constructed
Geometric Integration: Numerical Solution of Differential Equations on Manifolds
Scheichl, Robert
and the solar system. Conserved quantities of a Hamiltonian system, such as energy, linear and angular momentumGeometric Integration: Numerical Solution of Differential Equations on Manifolds C.J. Budd 1 & A riches. Psalms 104:24 Since their introduction by Sir Isaac Newton, differential equations have played
Clay Mathematics Proceedings Kahler-Ricci flow on complete manifolds
Ni, Lei
Clay Mathematics Proceedings K¨ahler-Ricci flow on complete manifolds Lei Ni Abstract. This is a paper based on author's lectures delivered at the 2005 Clay Mathematics Institute summer school at MSRI The 2005 Clay Mathematics Institute summer school at MSRI focused on Perel- man's work on Ricci flow
Protein clustering on a Grassmann manifold Chendra Hadi Suryanto1
Fukui, Kazuhiro
of the protein. The similarity of two protein structures is then defined by the canonical angles between outperforms the k-means clustering with Gauss Integrals Tuned, which is a state-of- the-art descriptor manifold, Gauss Integrals 1 Introduction Since there are numerous proteins whose functions are yet
university-logo Complete affine 3-manifolds and hyperbolic
Goldman, William
university-logo Complete affine 3-manifolds and hyperbolic surfaces Dedicated to Bill Thurston and hyperbolic surfaces #12;university-logo Three-dimensional affine space forms When can a group G act;university-logo Three-dimensional affine space forms When can a group G act on Euclidean space with quotient
Weldability Of New Ferritic Stainless Steel For Exhaust Manifold Application
Paris-Sud XI, Université de
Weldability Of New Ferritic Stainless Steel For Exhaust Manifold Application Vincent Villaret1-2, a-marie.fortain@airliquide.com, e gilles.fras@iut-nimes.fr, f fabien.januard@airliquide.com Keywords: ferritic stainless steel, efficiency and small size. To achieve such requirements, ferritic stainless steels with high chromium content
FUSION OF HAMILTONIAN LOOP GROUP MANIFOLDS AND COBORDISM
Woodward, Christopher
FUSION OF HAMILTONIAN LOOP GROUP MANIFOLDS AND COBORDISM E. MEINRENKEN AND C. WOODWARD Abstract. We References 32 1. Introduction Let G be a compact, connected, simply connected, simple Lie group and \\Sigma. In a sequel [15] to this paper, we apply our method to compute the coefficients of the fusion ring (Verlinde
Peirce, Anthony
of Bunger et al. (In Press) is consistent with past observations of multiple hydraulic fracture growth from Simultaneous Growth of Multiple Hydraulic Fractures A.P. Peirce, University of British Columbia and A.P. Bunger in horizontal well stimulation is the generation of hydraulic fractures (HFs) from all perforation clusters
Peirce, Anthony
Simultaneous Growth of Multiple Hydraulic Fractures A.P. Peirce, University of British Columbia and A.P. Bunger hurdles in horizontal well stimulation is the generation of hydraulic fractures (HFs) from all perforation shadowing" that refers to suppression of some hydraulic fractures by the compressive stresses exerted
Paris-Sud XI, Université de
on the transformation kinetics of TRIP and dual phase steels has been analyzed by many researchers, for example Al are responsible for the deformation pro cess taking place in TRIP steels during and after the phase transforThermo-mechanical behaviour of TRIP 1000 steel sheets subjected to low velocity perforation
Shultis, J. Kenneth
be realized for doubled or "sand- wiched" devices. Index Terms--Perforated detector, semiconductor neutron de neutron detection by a variety of re- search groups [1][14], all of which have generally used B, Li, Li 66506 USA (e-mail: mc- gregor@ksu.edu). Digital Object Identifier 10.1109/TNS.2006.872639 enter
Nicoud, Franck
and Astronautics #12;I. Introduction In order to cut down pollutant emissions, industrial gas turbine combustion on the prediction of combustion instabilities.5,6 In aeronautical gas turbines, walls of recent combustion chambers aims at showing the influence of perforated plates on the acoustic modes in aeronautical gas turbines
Numerical simulation of high-speed penetration-perforation dynamics in layered armor shields
Ayzenberg-Stepanenko, Mark
2012-01-01T23:59:59.000Z
Penetration models and calculating algorithms are presented, describing the dynamics and fracture of composite armor shields penetrated by high-speed small arms. A shield considered consists of hard (metal or ceramic) facing and multilayered fabric backing. A simple formula is proved for the projectile residual velocity after perforation of a thin facing. A new plastic-flow jet model is proposed for calculating penetration dynamics in the case of a thick facing of ceramic or metal-ceramic FGM materials. By bringing together the developed models into a calculating algorithm, a computer tool is designed enabling simulations of penetration processes in the above-mentioned shields and analysis of optimization problems. Some results of computer simulation are presented. It is revealed in particular that strength proof of pliable backing can be better as compared with more rigid backing. Comparison of calculations and test data shows sufficient applicability of the models and the tool.
Maz'ya, Vladimir; Nieves, Michael
2010-01-01T23:59:59.000Z
We describe a method of asymptotic approximations to solutions of mixed boundary value problems for the Laplacian in a three-dimensional domain with many perforations of arbitrary shape, with the Neumann boundary conditions being prescribed on the surfaces of small voids. The only assumption made on the geometry is that the diameter of a void is assumed to be smaller compared to the distance to the nearest neighbour. The asymptotic approximation, obtained here, involves a linear combination of dipole fields constructed for individual voids, with the coefficients, which are determined by solving a linear algebraic system. We prove the solvability of this system and derive an estimate for its solution. The energy estimate is obtained for the remainder term of the asymptotic approximation.
Swaddiwudhipong, S; Liu, Z S
2012-01-01T23:59:59.000Z
Finite element method (FEM) suffers from a serious mesh distortion problem when used for high velocity impact analyses. The smooth particle hydrodynamics (SPH) method is appropriate for this class of problems involving severe damages but at considerable computational cost. It is beneficial if the latter is adopted only in severely distorted regions and FEM further away. The coupled smooth particle hydrodynamics - finite element method (SFM) has been adopted in a commercial hydrocode LS-DYNA to study the perforation of Weldox 460E steel and AA5083-H116 aluminum plates with varying thicknesses and various projectile nose geometries including blunt, conical and ogival noses. Effects of the SPH domain size and particle density are studied considering the friction effect between the projectile and the target materials. The simulated residual velocities and the ballistic limit velocities from the SFM agree well with the published experimental data. The study shows that SFM is able to emulate the same failure mechan...
Numerical simulation of high-speed penetration-perforation dynamics in layered armor shields
Mark Ayzenberg-Stepanenko; Grigory Osharovich
2012-03-07T23:59:59.000Z
Penetration models and calculating algorithms are presented, describing the dynamics and fracture of composite armor shields penetrated by high-speed small arms. A shield considered consists of hard (metal or ceramic) facing and multilayered fabric backing. A simple formula is proved for the projectile residual velocity after perforation of a thin facing. A new plastic-flow jet model is proposed for calculating penetration dynamics in the case of a thick facing of ceramic or metal-ceramic FGM materials. By bringing together the developed models into a calculating algorithm, a computer tool is designed enabling simulations of penetration processes in the above-mentioned shields and analysis of optimization problems. Some results of computer simulation are presented. It is revealed in particular that strength proof of pliable backing can be better as compared with more rigid backing. Comparison of calculations and test data shows sufficient applicability of the models and the tool.
Vladimir Maz'ya; Alexander Movchan; Michael Nieves
2010-05-24T23:59:59.000Z
We describe a method of asymptotic approximations to solutions of mixed boundary value problems for the Laplacian in a three-dimensional domain with many perforations of arbitrary shape, with the Neumann boundary conditions being prescribed on the surfaces of small voids. The only assumption made on the geometry is that the diameter of a void is assumed to be smaller compared to the distance to the nearest neighbour. The asymptotic approximation, obtained here, involves a linear combination of dipole fields constructed for individual voids, with the coefficients, which are determined by solving a linear algebraic system. We prove the solvability of this system and derive an estimate for its solution. The energy estimate is obtained for the remainder term of the asymptotic approximation.
Geometrical Interpretation of Electromagnetism in 5-Dimensional Manifold
TaeHun Kim; Hyunbyuk Kim
2015-07-12T23:59:59.000Z
In this paper Kaluza-Klein theory is revisited and its implications are elaborated. We show that electromagnetic 4-potential is a deformation factor of a 5-dimensional (5D) manifold along the fifth (5th) axis. The charge-to-mass ratio has a physical meaning as the ratio of the movement along the direction of the 5th axis to the movement in the 4D space-time. Examinations on the interaction between particles registered by different observers suggest a covariance breaking of the 5th dimension. In order to have a 5D matter which is consistent with the construction of the 5D manifold, a notion of particle-thread is considered. Finally, the field equations which extend the Einstein field equations give the total energy-momentum tensor as a sum of that of matter, electromagnetic field, and the interaction between electric current and electromagnetic field.
Fuel cell stack with internal manifolds for reactant gases
Schnacke, Arthur W. (Schenectady, NY)
1985-01-01T23:59:59.000Z
A fuel cell stack includes a plurality of plate-like fuel cells arranged along an axis generally parallel to cell thickness with electrically conductive separator plates between each pair of cells. A plurality of axial manifolds are provided at opposite sides of the stack in outer marginal portions beyond the edges of electrodes and electrolyte tiles. Sealing rings prevent cross-leakage of oxidant fuel gases through use of pairs of outwardly extending lips from opposite tile surfaces bonded to first and second electrode frames respectively. The frames provide transition between electrode edges and manifold perimeters. The pairs of extension lips are sealingly bonded together through an electrically insulative sealing ring with wedge shaped fastening members.
Fuel cell stack with internal manifolds for reactant gases
Schnacke, A.W.
1983-10-12T23:59:59.000Z
A fuel cell stack includes a plurality of plate-like fuel cells arranged along an axis generally parallel to cell thickness with electrically conductive separator plates between each pair of cells. A plurality of axial manifolds are provided at opposite sides of the stack in outer marginal portions beyond the edges of electrodes and electrolyte tiles. Sealing rings prevent cross-leakage of oxidant fuel gases through use of pairs of outwardly extending lips from opposite tile surfaces bonded to first and second electrode frames respectively. The frames provide transition between electrode edges and manifold perimeters. The pairs of extension lips are sealingly bonded together through an electrically insulative sealing ring with wedge shaped fastening members.
Almost Einstein and Poincare-Einstein manifolds in Riemannian signature
A. Rod Gover
2008-03-25T23:59:59.000Z
An almost Einstein manifold satisfies equations which are a slight weakening of the Einstein equations; Einstein metrics, Poincare-Einstein metrics, and compactifications of certain Ricci-flat asymptotically locally Euclidean structures are special cases. The governing equation is a conformally invariant overdetermined PDE on a function. Away from the zeros of this the almost Einstein structure is Einstein, while the zero set gives a scale singularity set which may be viewed as a conformal infinity for the Einstein metric. In this article we give a classification of the possible scale singularity spaces and derive geometric results which explicitly relate the intrinsic conformal geometry of these to the conformal structure of the ambient almost Einstein manifold. Classes of examples are constructed. A compatible generalisation of the constant scalar curvature condition is also developed. This includes almost Einstein as a special case, and when its curvature is suitably negative, is closely linked to the notion of an asymptotically hyperbolic structure.
Geometrical Interpretation of Electromagnetism in 5-Dimensional Manifold
Kim, TaeHun
2015-01-01T23:59:59.000Z
In this paper Kaluza-Klein theory is revisited and its implications are elaborated. We show that electromagnetic 4-potential is a deformation factor of a 5-dimensional (5D) manifold along the fifth (5th) axis. The charge-to-mass ratio has a physical meaning as the ratio of the movement along the direction of the 5th axis to the movement in the 4D space-time. Examinations on the interaction between particles registered by different observers suggest a covariance breaking of the 5th dimension. In order to have a 5D matter which is consistent with the construction of the 5D manifold, a notion of particle-thread is considered. Finally, the field equations which extend the Einstein field equations give the total energy-momentum tensor as a sum of that of matter, electromagnetic field, and the interaction between electric current and electromagnetic field.
Ohbuchi, Ryutarou
printers,... User generated. T i bl 3D h· Trimble 3D warehouse... 3D model retrieval is essential scanners, 3D printers,... User generated. T i bl 3D h· Trimble 3D warehouse... 3D model retrievalRanking on Cross Domain Manifold forRanking on Cross-Domain Manifold for Sketch-based 3D model
Ohbuchi, Ryutarou
printers,... User generated. T i bl 3D h· Trimble 3D warehouse... 3D model retrieval is essentialRanking on Cross Domain Manifold forRanking on Cross-Domain Manifold for Sketch-based 3D model Retrieval Takahiko FuruyaRyutarou Ohbuchi University of Yamanashi #12;IntroductionIntroduction 3D models
Odd Jacobi manifolds: general theory and applications to generalised Lie algebroids
Andrew James Bruce
2012-06-28T23:59:59.000Z
In this paper we define a Grassmann odd analogue of Jacobi structure on a supermanifold. The basic properties are explored. The construction of odd Jacobi manifolds is then used to reexamine the notion of a Jacobi algebroid. It is shown that Jacobi algebroids can be understood in terms of a kind of curved Q-manifold, which we will refer to as a quasi Q-manifold.
Tensor calculus with open-source software: the SageManifolds project
Eric Gourgoulhon; Michal Bejger; Marco Mancini
2014-12-21T23:59:59.000Z
The SageManifolds project aims at extending the mathematics software system Sage towards differential geometry and tensor calculus. Like Sage, SageManifolds is free, open-source and is based on the Python programming language. We discuss here some details of the implementation, which relies on Sage's parent/element framework, and present a concrete example of use.
Hamilton-Jacobi Equations on a Manifold and Applications to Grid Generation or Re nement.
Hamilton-Jacobi Equations on a Manifold and Applications to Grid Generation or Re#28;nement. Ph Hamilton-Jacobi equations on a manifold, typically on the graph of some previously computed function z method. Keywords: Hamilton-Jacobi equations, viscosity solutions, level set method, adaptative meshes
EXPLICIT, IMPLICIT AND PARAMETRIC INVARIANT MANIFOLDS FOR MODEL REDUCTION IN CHEMICAL KINETICS
), Russia e-mail: hsablem@yahoo.com #12;Abstract Many systems studied in chemical kinetics can be posedEXPLICIT, IMPLICIT AND PARAMETRIC INVARIANT MANIFOLDS FOR MODEL REDUCTION IN CHEMICAL KINETICS and parametric invariant manifolds for model reduction in chemical kinetics V. Sobolev and E. Shchepakina
THE CO-STABILITY MANIFOLD OF A TRIANGULATED CATEGORY PETER JRGENSEN AND DAVID PAUKSZTELLO
JÃ¸rgensen, Peter
THE CO-STABILITY MANIFOLD OF A TRIANGULATED CATEGORY PETER JÃ?RGENSEN AND DAVID PAUKSZTELLO Abstract co-stability conditions as a `continuous' generalisation of co-t-structures. Our main result is that the set of nice co-stability conditions on a triangulated category is a manifold. In particular, we show
Toric data and Killing forms on homogeneous Sasaki-Einstein manifold $T^{1,1}$
Vladimir Slesar; Mihai Visinescu; Gabriel Eduard Vilcu
2015-03-02T23:59:59.000Z
Throughout this paper we investigate the complex structure of the conifold $C(T^{1,1})$ basically making use of the interplay between symplectic and complex approaches of the K\\"{a}hler toric manifolds. The description of the Calabi-Yau manifold $C(T^{1,1})$ using toric data allows us to write explicitly the complex coordinates and apply standard methods for extracting special Killing forms on the base manifold. As an outcome, we obtain the complete set of special Killing forms on the five-dimensional Sasaki-Einstein space $T^{1,1}$.
High-Dimensional Data Fusion via Joint Manifold Learning Mark A. Davenport,s
that acquire large amounts of very high-dimensional data. To cope with such a data deluge, manifold models number of vantage points and using multiple modalities. This can lead to a veritable data deluge, fueling
. One way to cope with such a data deluge is to develop low-dimensional data models. Manifold models points and using multiple modalities. This can lead to a veritable data deluge, fueling the need
Manifold and method of batch measurement of Hg-196 concentration using a mass spectrometer
Grossman, M.W.; Evans, R.
1991-11-26T23:59:59.000Z
A sample manifold and method of its use has been developed so that milligram quantities of mercury can be analyzed mass spectroscopically to determine the [sup 196]Hg concentration to less than 0.02 atomic percent. Using natural mercury as a standard, accuracy of [+-]0.002 atomic percent can be obtained. The mass spectrometer preferably used is a commercially available GC/MS manufactured by Hewlett Packard. A novel sample manifold is contained within an oven allowing flow rate control of Hg into the MS. Another part of the manifold connects to an auxiliary pumping system which facilitates rapid clean up of residual Hg in the manifold. Sample cycle time is about 1 hour. 8 figures.
Manifold and method of batch measurement of Hg-196 concentration using a mass spectrometer
Grossman, Mark W. (Belmont, MA); Evans, Roger (N. Hampton, NH)
1991-01-01T23:59:59.000Z
A sample manifold and method of its use has been developed so that milligram quantities of mercury can be analyzed mass spectroscopically to determine the .sup.196 Hg concentration to less than 0.02 atomic percent. Using natural mercury as a standard, accuracy of .+-.0.002 atomic percent can be obtained. The mass spectrometer preferably used is a commercially available GC/MS manufactured by Hewlett Packard. A novel sample manifold is contained within an oven allowing flow rate control of Hg into the MS. Another part of the manifold connects to an auxiliary pumping system which facilitates rapid clean up of residual Hg in the manifold. Sample cycle time is about 1 hour.
Asymptotic behavior of complete Ricci-flat metrics on open manifolds
Santoro, Bianca
2006-01-01T23:59:59.000Z
In this thesis, we describe the asymptotic behavior of complete Ricci-flat Kihler metrics on open manifolds that can be compactified by adding a smooth, ample divisor. This result provides an answer to a question addressed ...
Mechanical Systems on an almost Kähler model of a Finsler Manifold
Mehmet Tekkoyun; O?uzhan Çelik
2012-11-06T23:59:59.000Z
In this study, we present a new analogue of Euler-Lagrange and Hamilton equations on an almost K\\"ahler model of a Finsler manifold. Also, we give some corollories about the related mechanical systems and equations.
Characterization and parameterization of the singular manifold of a simple 6-6 Stewart platform
T. Charters; P. Freitas
2008-11-07T23:59:59.000Z
This paper presents a study of the characterization of the singular manifold of the six-degree-of-freedom parallel manipulator commonly known as the Stewart platform. We consider a platform with base vertices in a circle and for which the bottom and top plates are related by a rotation and a contraction. It is shown that in this case the platform is always in a singular configuration and that the singular manifold can be parameterized by a scalar parameter.
Wagner, Anthony
-amino-5-phosphonovaleric acid (APV) infusions, whereas lateral perforant path plasticity can be attenuated by naloxone infusions. The present experiment was designed to evaluate the role of each entorhinal) changes in the overall configuration of environmental stimuli. Dorsal dentate gyrus infusions of either
Superization of Homogeneous Spin Manifolds and Geometry of Homogeneous Supermanifolds
Andrea Santi
2009-05-24T23:59:59.000Z
Let M_0=G_0/H be a (pseudo)-Riemannian homogeneous spin manifold, with reductive decomposition g_0=h+m and let S(M_0) be the spin bundle defined by the spin representation Ad:H->\\GL_R(S) of the stabilizer H. This article studies the superizations of M_0, i.e. its extensions to a homogeneous supermanifold M=G/H whose sheaf of superfunctions is isomorphic to Lambda(S^*(M_0)). Here G is the Lie supergroup associated with a certain extension of the Lie algebra of symmetry g_0 to an algebra of supersymmetry g=g_0+g_1=g_0+S via the Kostant-Koszul construction. Each algebra of supersymmetry naturally determines a flat connection nabla^{S} in the spin bundle S(M_0). Killing vectors together with generalized Killing spinors (i.e. nabla^{S}-parallel spinors) are interpreted as the values of appropriate geometric symmetries of M, namely even and odd Killing fields. An explicit formula for the Killing representation of the algebra of supersymmetry is obtained, generalizing some results of Koszul. The generalized spin connection nabla^{S} defines a superconnection on M, via the super-version of a theorem of Wang.
Weyl Tensor Classification in Four-dimensional Manifolds of All Signatures
Carlos Batista
2013-02-07T23:59:59.000Z
It is well known that the classification of the Weyl tensor in Lorentzian manifolds of dimension four, the so called Petrov classification, was a great tool to the development of general relativity. Using the bivector approach it is shown in this article a classification for the Weyl tensor in all four-dimensional manifolds, including all signatures and the complex case, in an unified and simple way. The important Petrov classification then emerges just as a particular case in this scheme. The boost weight classification is also extended here to all signatures as well to complex manifolds. For the Weyl tensor in four dimensions it is established that this last approach produces a classification equivalent to the one generated by the bivector method.
Zuo-Bing Wu
2008-03-17T23:59:59.000Z
In this paper, a method to construct topological template in terms of symbolic dynamics for the diamagnetic Kepler problem is proposed. To confirm the topological template, rotation numbers of invariant manifolds around unstable periodic orbits in a phase space are taken as an object of comparison. The rotation numbers are determined from the definition and connected with symbolic sequences encoding the periodic orbits in a reduced Poincar\\'e section. Only symbolic codes with inverse ordering in the forward mapping can contribute to the rotation of invariant manifolds around the periodic orbits. By using symbolic ordering, the reduced Poincar\\'e section is constricted along stable manifolds and a topological template, which preserves the ordering of forward sequences and can be used to extract the rotation numbers, is established. The rotation numbers computed from the topological template are the same as those computed from their original definition.
Natural star-products on symplectic manifolds and related quantum mechanical operators
B?aszak, Maciej, E-mail: blaszakm@amu.edu.pl; Doma?ski, Ziemowit, E-mail: ziemowit@amu.edu.pl
2014-05-15T23:59:59.000Z
In this paper is considered a problem of defining natural star-products on symplectic manifolds, admissible for quantization of classical Hamiltonian systems. First, a construction of a star-product on a cotangent bundle to an Euclidean configuration space is given with the use of a sequence of pair-wise commuting vector fields. The connection with a covariant representation of such a star-product is also presented. Then, an extension of the construction to symplectic manifolds over flat and non-flat pseudo-Riemannian configuration spaces is discussed. Finally, a coordinate free construction of related quantum mechanical operators from Hilbert space over respective configuration space is presented. -- Highlights: •Invariant representations of natural star-products on symplectic manifolds are considered. •Star-products induced by flat and non-flat connections are investigated. •Operator representations in Hilbert space of considered star-algebras are constructed.
IS-321-312-001 TEP-to-HTEP manifold interface sheet
Willms, R Scott [Los Alamos National Laboratory; Carlson, Bryan J [Los Alamos National Laboratory; Coons, James E [Los Alamos National Laboratory; Kubic, William L [Los Alamos National Laboratory
2008-01-01T23:59:59.000Z
The Tokamak Exhaust Processing System (TEP) receives hydrogen-like and air-like gas streams from the High Tritium Exhaust Processing (HTEP) manifold. Gases from the torus roughing pump are pumped into the HTEP manifold before entering TEP. This interface sheet describes the TEP-HTEP material stream interface, both the physical elements that make up the interface as well as the gas streams that will flow through the interface. The functions of this interface are to: Provide a physical connection for the transport of hydrogen-like and air-like gases from the HTEP manifold to TEP. Provide seals to prevent the unncessary release of tritium to the surrounding environment. Provide valves that can be actuated to stop or prevent the flow of gas into TEP.
McGregor, Douglas S. (Riley, KS); Shultis, John K. (Manhattan, KS); Rice, Blake B. (Manhattan, KS); McNeil, Walter J. (Winnfield, KS); Solomon, Clell J. (Wichita, KS); Patterson, Eric L. (Manhattan, KS); Bellinger, Steven L. (Manhattan, KS)
2010-12-21T23:59:59.000Z
Non-streaming high-efficiency perforated semiconductor neutron detectors, method of making same and measuring wands and detector modules utilizing same are disclosed. The detectors have improved mechanical structure, flattened angular detector responses, and reduced leakage current. A plurality of such detectors can be assembled into imaging arrays, and can be used for neutron radiography, remote neutron sensing, cold neutron imaging, SNM monitoring, and various other applications.
Kahler Potential for M-theory on a G_2 Manifold
Andre Lukas; Stephen Morris
2003-11-21T23:59:59.000Z
We compute the moduli Kahler potential for M-theory on a compact manifold of G_2 holonomy in a large radius approximation. Our method relies on an explicit G_2 structure with small torsion, its periods and the calculation of the approximate volume of the manifold. As a verification of our result, some of the components of the Kahler metric are computed directly by integration over harmonic forms. We also discuss the modification of our result in the presence of co-dimension four singularities and derive the gauge-kinetic functions for the massless gauge fields that arise in this case.
A new approach for magnetic curves in 3D Riemannian manifolds
Bozkurt, Zehra, E-mail: zbozkurt@ankara.edu.tr; Gök, Ismail, E-mail: igok@science.ankara.edu.tr; Yayl?, Yusuf, E-mail: yayli@science.ankara.edu.tr; Ekmekci, F. Nejat, E-mail: ekmekci@science.ankara.edu.tr [Department of Mathematics, Faculty of Science, University of Ankara, Ankara (Turkey)
2014-05-15T23:59:59.000Z
A magnetic field is defined by the property that its divergence is zero in a three-dimensional oriented Riemannian manifold. Each magnetic field generates a magnetic flow whose trajectories are curves called as magnetic curves. In this paper, we give a new variational approach to study the magnetic flow associated with the Killing magnetic field in a three-dimensional oriented Riemann manifold, (M{sup 3}, g). And then, we investigate the trajectories of the magnetic fields called as N-magnetic and B-magnetic curves.
An integral manifold approach to reduced order dynamic modeling of synchronous machines
Sauer, P.W.; Ahmed-Zaid, S.; Kokotovic, P.V.
1988-02-01T23:59:59.000Z
The concept of integral manifolds is used to systematically create improved reduced order models of synchronous machines. The approach is illustrated through a detailed example of a single machine connected to an infinite bus. The example shows the advantages of the manifold approach and also clarifies several issues about reduced order models of synchronous machines. The basic objective of the method is to include the effects of more complex models without actually including the additional differential equations. This is illustrated by including the effects of stator transients and damper windings on the swing equation without including the differential equations.
Utah, University of
of the population. We evaluate the proposed method on the OASIS and ADNI brain databases of head MR images in twoManifold modeling for brain population analysis Samuel Gerber *, Tolga Tasdizen, P. Thomas Fletcher Brain MRI Manifold learning Computer aided clinical diagnosis a b s t r a c t This paper describes
Wisconsin at Madison, University of
Multivariate General Linear Models (MGLM) on Riemannian Manifolds with Applications to Statistical range of such methods by deriv- ing schemes for multivariate multiple linear regression -- a manifold ] , ^ = ¯y - ^¯x. (2) If x and y are multivariates, one can easily replace the mul- tiplication and division
Needell, Deanna
CS Applications CS Math MR Applications MR Math MR Theory Proof Bridging Matrix Recovery Gaps using #12;CS Applications CS Math MR Applications MR Math MR Theory Proof Outline Compressed Sensing (CS manifold theory Deanna Needell Bridging Matrix Recovery Gaps using Manifolds #12;CS Applications CS Math MR
Flow regimes and heat transfer in vertical narrow annuli
Ulke, A.; Goldberg, I.
1993-11-01T23:59:59.000Z
In shell side boiling heat exchangers narrow crevices that are formed between the tubes and the tube support structure provide areas for local thermal-hydraulic conditions which differ significantly from bulk fluid conditions. Understanding of the processes of boiling and dryout in flow restricted crevices can help in designing of tube support geometries to minimize the likelihood of tube support plate and tube corrosion observed in commercial power plant steam generators. This paper describes a one dimensional thermal-hydraulic model of a vertical crevice between a tube and a support plate with cylindrical holes. The annulus formed by the support plate hole and an eccentrically located tube has been represented by vertical strips. The formation, growth and collapse of a steam bubble in each strip has been determined. Based on the bubble history, and flow regimes characterized by ``isolated`` bubbles, ``coalesced`` bubbles and liquid deficient regions have been defined.
An experimental investigation of sand transport in inclined eccentric annuli
McClellan, John Christopher
1991-01-01T23:59:59.000Z
-liquid flow and gas-solid flow are so great that such literature is of little insight. It should be noted that horizontal drilling has been done with air/mist, as described by Yost40 in one of the first examples. Other inclined two-phase flow papers were... annulus. An annular flow model was designed, fabricated, and installed in the Drilling Fluids Research Laboratory, Petroleum Engineering, Texas ASM University, by the author. The model is capable of inclinations of 30 to 90 degrees (from the vertical...
An experimental investigation of sand transport in inclined eccentric annuli
McClellan, John Christopher
1991-01-01T23:59:59.000Z
of Ihoyo and Tomren mentioned above. Also noted was the effect of a cuttings bed sliding, in inclinations up to the 60-degree range, after circulation was stopped. Other researchers have also noted this effect and the incipient dangers to drilling... suspension, heterogeneous suspension, saltation, clusters, dunes, continuous moving beds, and stationary beds. Similar to the author's research, they used sand particles continuously circulated at a set concentration. In their conclusions they state: 1...
ESTIMATION OF EXHAUST MANIFOLD PRESSURE IN TURBOCHARGED GASOLINE ENGINES WITH VARIABLE VALVE TIMING
Grizzle, Jessy W.
ESTIMATION OF EXHAUST MANIFOLD PRESSURE IN TURBOCHARGED GASOLINE ENGINES WITH VARIABLE VALVE TIMING in turbocharged gasoline engines with variable valve timing requires knowledge of exhaust mani- fold pressure, Pe control systems for gasoline engines rely heavily on feedforward air-fuel ratio (A/F) control to meet
Minimal Riesz energy point configurations for rectifiable d-dimensional manifolds
Hardin, Doug
, these results are new. Key words: Minimal discrete Riesz energy, Best-packing, Hausdorff measure, Rectifiable best-packing, mini- mization of energy (e.g., Coulomb potentials), spherical t-designs (cubatureMinimal Riesz energy point configurations for rectifiable d-dimensional manifolds D.P. Hardin
Integrability of D1-brane on Group Manifold with Mixed Three Form Flux
Kluson, J
2015-01-01T23:59:59.000Z
We consider D1-brane as a natural probe of the group manifold with mixed three form fluxes. We determine Lax connection for given theory. Then we switch to the canonical analysis and calculate the Poisson brackets between spatial components of Lax connections and we argue for integrability of given theory.
Paris-Sud XI, Université de
Reduction, Centre Manifold, Robust Analysis, Uncertainty Propagation, Polynomial chaos, Non-intrusive to compute the deterministic components called stochastic modes in an intrusive and a non intrusive manner while random components are concentrated in the polynomial basis used. Non intrusive procedures
Invariant Manifolds for the Station Keeping of Solar Sails Ariadna Farres, AJ
Boyer, Edmond
Invariant Manifolds for the Station Keeping of Solar Sails Ariadna Farr´es, AJ Universitat de 2 / 45 inria-00585612,version1-14Apr2011 #12;Background What is a Solar Sail ? Solar Sails are a new concept of spacecraft propulsion that takes ad- vantage of the Solar radiation pressure to propel
Side branch absorber for exhaust manifold of two-stroke internal combustion engine
Harris, Ralph E. (San Antonio, TX); Broerman, III, Eugene L. (San Antonio, TX); Bourn, Gary D. (Laramie, WY)
2011-01-11T23:59:59.000Z
A method of improving scavenging operation of a two-stroke internal combustion engine. The exhaust pressure of the engine is analyzed to determine if there is a pulsation frequency. Acoustic modeling is used to design an absorber. An appropriately designed side branch absorber may be attached to the exhaust manifold.
Manifold Assembly for the Convenient Polymerization of Ethylene Oxide and Butadiene
Notes Manifold Assembly for the Convenient Polymerization of Ethylene Oxide and Butadiene Gre,3-butadiene (BD) are two examples of gaseous monomers at room temperature. Typically, these two gaseous,3-butadiene and ethylene oxide requires great care as they boil at -4.4 and 10.7 °C, respecti
Pose Estimation via Gauss-Newton-on-manifold Pei Yean Lee and John B. Moore
Moore, John Barratt
on the smooth manifold of rotation matrices, namely the special orthogonal matrices SO3, depicted as the surface of a cone in Fig. 1. Also, in Fig. 1, the feasible domain is depicted as the intersection SO3 K. The cost
Computing Lyapunov exponents on a Stiefel manifold by Thomas J. Bridges and Sebastian Reich
Reich, Sebastian
Computing Lyapunov exponents on a Stiefel manifold by Thomas J. Bridges and Sebastian Reich The problem of numerical computation of a few Lyapunov exponents of #12;nite-dimensional dynamical systems computes one, many or all Lyapunov exponents of a continuous dynamical system by time integration, discrete
university-logo Two papers which changed my life: Milnor's seminal work on flat manifolds
Goldman, William
university-logo Two papers which changed my life: Milnor's seminal work on flat manifolds Two Banff International Research Station February 24, 2011 #12;university-logo Two papers which changed my of Euclidean 3-space by free groups of affine transformations. #12;university-logo Two papers which changed my
Manifold-based starting point generation and its application to distillation
Neumaier, Arnold
Manifold-based starting point generation and its application to distillation Ali Baharev*, Ferenc-states in homogeneous azeotropic distillation . . . . . . . . . . 11 5.2 Multiple steady-states in ideal two-product distillation . . . . . . . . . . . . . . 11 6 Conclusion 13 A Ordering sparse matrices 14 A.1 Ordering to block
ANALYTIC EQUIVALENCE OF NORMAL CROSSING FUNCTIONS ON A REAL ANALYTIC MANIFOLD
Paris-Sud XI, Université de
ANALYTIC EQUIVALENCE OF NORMAL CROSSING FUNCTIONS ON A REAL ANALYTIC MANIFOLD Goulwen Fichou crossing singularities after a modification. We focus on the analytic equivalence of such functions with only normal crossing singularities. We prove that for such functions C right equivalence implies
Mechanics Systems on Para-Kaehlerian Manifolds of Constant J-Sectional Curvature
Mehmet Tekkoyun
2009-02-20T23:59:59.000Z
The goal of this paper is to present Euler-Lagrange and Hamiltonian equations on R2n which is a model of para-Kaehlerian manifolds of constant J-sectional curvature. In conclusion, some differential geometrical and physical results on the related mechanic systems have been given.
Extension of distributions, scalings and renormalization of QFT on Riemannian manifolds
Nguyen Viet Dang
2014-11-13T23:59:59.000Z
Let $M$ be a smooth manifold and $X\\subset M$ a closed subset of $M$. In this paper, we introduce a natural condition of \\emph{moderate growth} along $X$ for a distribution $t$ in $\\mathcal{D}^\\prime(M\\setminus X)$ and prove that this condition is equivalent to the existence of an extension of $t$ in $\\mathcal{D}^\\prime(M)$ generalizing some previous results of Meyer and Brunetti--Fredenhagen. When $X$ is a closed submanifold of $M$, we show that the concept of distributions with moderate growth coincides with weakly homogeneous distributions of Meyer. Then we renormalize products of distributions with functions tempered along $X$ and finally, using the whole analytical machinery developed, we give an existence proof of perturbative quantum field theories on Riemannian manifolds.
Victor Kalvin
2010-07-25T23:59:59.000Z
In this paper we continue our study of the Laplacian on manifolds with axial analytic asymptotically cylindrical ends initiated in~arXiv:1003.2538. By using the complex scaling method and the Phragm\\'{e}n-Lindel\\"{o}f principle we prove exponential decay of the eigenfunctions corresponding to the non-threshold eigenvalues of the Laplacian on functions. In the case of a manifold with (non-compact) boundary it is either the Dirichlet Laplacian or the Neumann Laplacian. We show that the rate of exponential decay of an eigenfunction is prescribed by the distance from the corresponding eigenvalue to the next threshold. Under our assumptions on the behaviour of the metric at infinity accumulation of isolated and embedded eigenvalues occur. The results on decay of eigenfunctions combined with the compactness argument due to Perry imply that the eigenvalues can accumulate only at thresholds and only from below. The eigenvalues are of finite multiplicity.
The Construction of Spinor Fields on Manifolds with Smooth Degenerate Metrics
J Schray; T Dray; C A Manogue; R W Tucker; C Wang
1996-05-17T23:59:59.000Z
We examine some of the subtleties inherent in formulating a theory of spinors on a manifold with a smooth degenerate metric. We concentrate on the case where the metric is singular on a hypersurface that partitions the manifold into Lorentzian and Euclidean domains. We introduce the notion of a complex spinor fibration to make precise the meaning of continuity of a spinor field and give an expression for the components of a local spinor connection that is valid in the absence of a frame of local orthonormal vectors. These considerations enable one to construct a Dirac equation for the discussion of the behavior of spinors in the vicinity of the metric degeneracy. We conclude that the theory contains more freedom than the spacetime Dirac theory and we discuss some of the implications of this for the continuity of conserved currents.
Quantization of a particle on a two-dimensional manifold of constant curvature
Bracken, Paul [Department of Mathematics, University of Texas, Edinburg, Texas 78540 (United States)
2014-10-15T23:59:59.000Z
The formulation of quantum mechanics on spaces of constant curvature is studied. It is shown how a transition from a classical system to the quantum case can be accomplished by the quantization of the Noether momenta. These can be determined by means of Lie differentiation of the metric which defines the manifold. For the metric examined here, it is found that the resulting Schrödinger equation is separable and the spectrum and eigenfunctions can be investigated in detail.
Energy identity of approximate biharmonic maps to Riemannian manifolds and its application
Wang, Changyou
2011-01-01T23:59:59.000Z
We consider in dimension four weakly convergent sequences of approximate biharmonic maps to a Riemannian manifold with bi-tension fields bounded in $L^p$ for $p>\\frac43$. We prove an energy identity that accounts for the loss of hessian energies by the sum of hessian energies over finitely many nontrivial biharmonic maps on $\\mathbb R^4$. As a corollary, we obtain an energy identity for the heat flow of biharmonic maps at time infinity.
Spinorial description of $\\mathrm{SU}(3)$- and $G_2$-manifolds
Ilka Agricola; Simon G. Chiossi; Thomas Friedrich; Jos Höll
2015-09-16T23:59:59.000Z
We present a uniform description of $\\mathrm{SU}(3)$-structures in dimension $6$ as well as $G_2$-structures in dimension $7$ in terms of a characterising spinor and the spinorial field equations it satisfies. We apply the results to hypersurface theory to obtain new embedding theorems, and give a general recipe for building conical manifolds. The approach also enables one to subsume all variations of the notion of a Killing spinor.
Perforation patterned electrical interconnects
Frey, Jonathan
2014-01-28T23:59:59.000Z
This disclosure describes systems and methods for increasing the usable surface area of electrical contacts within a device, such as a thin film solid state device, through the implementation of electrically conductive interconnects. Embodiments described herein include the use of a plurality of electrically conductive interconnects that penetrate through a top contact layer, through one or more multiple layers, and into a bottom contact layer. The plurality of conductive interconnects may form horizontal and vertical cross-sectional patterns. The use of lasers to form the plurality of electrically conductive interconnects from reflowed layer material further aids in the manufacturing process of a device.
Kelley; Dana A. (New Milford, CT), Farooque; Mohammad (Danbury, CT), Davis; Keith (Southbury, CT)
2007-10-02T23:59:59.000Z
A fuel cell system with improved electrical isolation having a fuel cell stack with a positive potential end and a negative potential, a manifold for use in coupling gases to and from a face of the fuel cell stack, an electrical isolating assembly for electrically isolating the manifold from the stack, and a unit for adjusting an electrical potential of the manifold such as to impede the flow of electrolyte from the stack across the isolating assembly.
Tin, Marie-Lyne Appoline
1992-01-01T23:59:59.000Z
fulfiffment of the requirements for tht (Iecffce ol' ~IASTErt OF SCIf X& l. : Decenit&er 1999 ttla jor Sul~ ject: 1;jr i trical I;ngineerin~ DISCRETE TIME ROBUST CONTROL SYSTEMS UNDER STRUCTURFD PERTURBATIONS: STABILITY MANIFOLDS AND EXTREMAL PROPERTIES... A Thesis by MARIE-LYNE APPOLINE TIN Approved as to style and content by: S. P. Bhattacharyya (Chair of Committee) A. Datta. ('t'lend&er) L Howz (Member) . Parlos lr1eniher) A. Patton (Head of Department) December I'19'2 ABSTRACT...
Eigenvalues of Killing Tensors and Separable Webs on Riemannian and Pseudo-Riemannian Manifolds
Claudia Chanu; Giovanni Rastelli
2007-02-12T23:59:59.000Z
Given a $n$-dimensional Riemannian manifold of arbitrary signature, we illustrate an algebraic method for constructing the coordinate webs separating the geodesic Hamilton-Jacobi equation by means of the eigenvalues of $m \\leq n$ Killing two-tensors. Moreover, from the analysis of the eigenvalues, information about the possible symmetries of the web foliations arises. Three cases are examined: the orthogonal separation, the general separation, including non-orthogonal and isotropic coordinates, and the conformal separation, where Killing tensors are replaced by conformal Killing tensors. The method is illustrated by several examples and an application to the L-systems is provided.
Mariz, T.; Menezes, R.; Nascimento, J.R.S.; Ribeiro, R.F. [Departamento de Fisica, Universidade Federal da Paraiba, 58051-970 Joao Pessoa, Paraiba (Brazil); Wotzasek, C. [Instituto de Fisica, Universidade Federal do Rio de Janeiro, 21945 Rio de Janeiro (Brazil)
2004-10-15T23:59:59.000Z
We study issues of duality and dual equivalence in noncommutative manifolds. In particular, the question of dual equivalence for the actions of the noncommutative extensions of the self-dual model in 3D space-time and the Maxwell-Chern-Simons model is investigated. We show that former model is not dual equivalent to the noncommutative extension of the Maxwell-Chern-Simons model, as widely believed, but a deformed version of it that is disclosed here. Our results are not restricted to any finite order in the Seiberg-Witten expansion involving the noncommutative parameter {theta}.
SO(10) Grand Unification in M theory on a G2 manifold
Acharya, Bobby S; Romao, Miguel Crispim; King, Stephen F; Pongkitivanichkul, Chakrit
2015-01-01T23:59:59.000Z
We consider Grand Unified Theories based on $SO(10)$ which originate from string/$M$ theory on $G_2$ manifolds or Calabi-Yau spaces with discrete symmetries. In this framework we are naturally led to a novel solution of the doublet-triplet splitting problem previously considered by Dvali which involves an extra vector-like Standard Model family and light, but weakly coupled colour triplets. These additional states are predicted to be accessible at the LHC and also induce R-parity violation. Gauge coupling unification occurs with a larger GUT coupling.
SO(10) Grand Unification in M theory on a G2 manifold
Bobby S. Acharya; Krzysztof Bozek; Miguel Crispim Romao; Stephen F. King; Chakrit Pongkitivanichkul
2015-02-05T23:59:59.000Z
We consider Grand Unified Theories based on $SO(10)$ which originate from string/$M$ theory on $G_2$ manifolds or Calabi-Yau spaces with discrete symmetries. In this framework we are naturally led to a novel solution of the doublet-triplet splitting problem previously considered by Dvali which involves an extra vector-like Standard Model family and light, but weakly coupled colour triplets. These additional states are predicted to be accessible at the LHC and also induce R-parity violation. Gauge coupling unification occurs with a larger GUT coupling.
Falicoff, Waqidi; Chaves, Julio C.; Minano, Juan Carlos; Benitez, Pablo; Dross, Oliver; Parkyn, Jr., William A.
2010-02-23T23:59:59.000Z
Optical systems are described that have at least one source of a beam of blue light with divergence under 15.degree.. A phosphor emits yellow light when excited by the blue light. A collimator is disposed with the phosphor and forms a yellow beam with divergence under 15.degree.. A dichroic filter is positioned to transmit the beam of blue light to the phosphor and to reflect the beam of yellow light to an exit aperture. In different embodiments, the beams of blue and yellow light are incident upon said filter with central angles of 15.degree., 22.degree., and 45.degree.. The filter may reflect all of one polarization and part of the other polarization, and a polarization rotating retroreflector may then be provided to return the unreflected light to the filter.
Pauwels, M.A.; Wright, D.O.
1986-07-15T23:59:59.000Z
A microprocessor based electronic engine control system is described for an internal combustion engine, a method for updating the stored ambient pressure signal by measuring the ambient barometric pressure during engine operation using a manifold pressure sensor. The method consists of: generating timing signals indicating the rotational position of an engine member and including a signal indicating a predetermined rotational position in the rotation of the engine member; generating a pressure signal from the manifold pressure sensor representing the pressure surrounding the sensor in response to the predetermined rotational position; reading the value of ambient barometric pressure stored in the memory of the microprocessor; comparing the value of the barometric pressure stored in the memory of the microprocessor and the value of the pressure signal; increasing the value of the barometric pressure by one unit to generate a new barometric pressure value when the value of the pressure signal is greater than the value of the barometric pressure; comparing the new barometric pressure value with a predetermined fixed constant representing the maximum barometric pressure; and storing in the memory of the microprocessor either the new barometric pressure value if equal to or less than the fixed constant or the value of the maximum barometric pressure if the new barometric pressure value is greater than the fixed constant.
Carmeline J. Dsilva; Ronen Talmon; Ronald R. Coifman; Ioannis G. Kevrekidis
2015-05-22T23:59:59.000Z
Nonlinear manifold learning algorithms, such as diffusion maps, have been fruitfully applied in recent years to the analysis of large and complex data sets. However, such algorithms still encounter challenges when faced with real data. One such challenge is the existence of "repeated eigendirections," which obscures the detection of the true dimensionality of the underlying manifold and arises when several embedding coordinates parametrize the same direction in the intrinsic geometry of the data set. We propose an algorithm, based on local linear regression, to automatically detect coordinates corresponding to repeated eigendirections. We construct a more parsimonious embedding using only the eigenvectors corresponding to unique eigendirections, and we show that this reduced diffusion maps embedding induces a metric which is equivalent to the standard diffusion distance. We first demonstrate the utility and flexibility of our approach on synthetic data sets. We then apply our algorithm to data collected from a stochastic model of cellular chemotaxis, where our approach for factoring out repeated eigendirections allows us to detect changes in dynamical behavior and the underlying intrinsic system dimensionality directly from data.
Global dynamics and inflationary center manifold and slow-roll approximants
Artur Alho; Claes Uggla
2015-01-15T23:59:59.000Z
We consider the familiar problem of a minimally coupled scalar field with quadratic potential in flat Friedmann-Lema\\^itre-Robertson-Walker cosmology to illustrate a number of techniques and tools, which can be applied to a wide range of scalar field potentials and problems in e.g. modified gravity. We present a global and regular dynamical systems description that yields a global understanding of the solution space, including asymptotic features. We introduce dynamical systems techniques such as center manifold expansions and use Pad\\'e approximants to obtain improved approximations for the `attractor solution' at early times. We also show that future asymptotic behavior is associated with a limit cycle, which shows that manifest self-similarity is asymptotically broken toward the future, and give approximate expressions for this behavior. We then combine these results to obtain global approximations for the attractor solution, which, e.g., might be used in the context of global measures. In addition we elucidate the connection between slow-roll based approximations and the attractor solution, and compare these approximations with the center manifold based approximants.
Daraio, Chiara
Keywords: Microchannel heat sink Electronics cooling Energy Exergy Efficiency Turbulent flow a b s t r a c t A detailed thermo-hydrodynamic analysis of a hot water cooled manifold microchannel heat sink for electronic. The energetic performance of the heat sink is analyzed in terms of 2nd law efficiency and sources of exergy
Fern, Xiaoli Zhang
of organization. Audio classification systems typically begin by extract- ing acoustic features from audio signalsAudio Classification of Bird Species: a Statistical Manifold Approach Forrest Briggs, Raviv Raich}@eecs.oregonstate.edu Abstract Our goal is to automatically identify which species of bird is present in an audio recording using
Pless, Robert
Manifold Learning for 4D CT Reconstruction of the Lung Manfred Georg*, Richard Souvenir, Andrew, Canada Andrew.Hope@rmp.uhn.on.ca Abstract Computed Tomography is used to create models of lung dynamics because it provides high contrast images of lung tissue. Creating 4D CT models which capture dynamics
Pope, Christopher
Geometry and Group Theory ABSTRACT In this course, we develop the basic notions of Manifolds and Geometry, with applications in physics, and also we develop the basic notions of the theory of Lie Groups . . . . . . . . . . . . . . . . . . . . . 66 2 General Relativity; Einstein's Theory of Gravitation 73 2.1 The Equivalence Principle
Numerical Computation of the Stable and Unstable Manifolds of Invariant Tori
Derin B. Wysham; James D. Meiss
2005-04-26T23:59:59.000Z
We develop an iterative technique for computing the unstable and stable eigenfunctions of the invariant tori of diffeomorphisms. Using the approach of Jorba, the linearized equations are rewritten as a generalized eigenvalue problem. Casting the system in this light allows us to take advantage of the speed of eigenvalue solvers and create an efficient method for finding the first order approximations to the invariant manifolds of the torus. We present a numerical scheme based on the power method that can be used to determine the behavior normal to such tori, and give some examples of the application of the method. We confirm the qualitative conclusions of the Melnikov calculations of Lomel\\'i and Meiss (2003) for a volume-preserving mapping.
Solid oxide fuel cell having monolithic cross flow core and manifolding
Poeppel, R.B.; Dusek, J.T.
1983-10-12T23:59:59.000Z
This invention discloses a monolithic core construction having the flow passageways for the fuel and for the oxidant gases extended transverse to one another, whereby full face core manifolding can be achieved for these gases and their reaction products. The core construction provides that only anode material surround each fuel passageway and only cathode material surround each oxidant passageway, each anode and each cathode further sandwiching at spaced opposing sides electrolyte and interconnect materials to define electrolyte and interconnect walls. Webs of the cathode and anode material hold the electrolyte and interconnect walls spaced apart to define the flow passages. The composite anode and cathode wall structures are further alternately stacked on one another (with the separating electrolyte or interconnect material typically being a single common layer) whereby the fuel passageways and the oxidant passageways are disposed transverse to one another.
Solid oxide fuel cell having monolithic cross flow core and manifolding
Poeppel, Roger B. (Glen Ellyn, IL); Dusek, Joseph T. (Downers Grove, IL)
1984-01-01T23:59:59.000Z
This invention discloses a monolithic core construction having the flow passageways for the fuel and for the oxidant gases extended transverse to one another, whereby full face core manifolding can be achieved for these gases and their reaction products. The core construction provides that only anode material surround each fuel passageway and only cathode material surround each oxidant passageway, each anode and each cathode further sandwiching at spaced opposing sides electrolyte and interconnect materials to define electrolyte and interconnect walls. Webs of the cathode and anode material hold the electrolyte and interconnect walls spaced apart to define the flow passages. The composite anode and cathode wall structures are further alternately stacked on one another (with the separating electrolyte or interconnect material typically being a single common layer) whereby the fuel passageway and the oxidant passageways are disposed transverse to one another.
Manifold, bus support and coupling arrangement for solid oxide fuel cells
Parry, G.W.
1988-04-21T23:59:59.000Z
Individual, tubular solid oxide fuel cells (SOFCs) are assembled into bundles called a module within a housing, with a plurality of modules arranged end-to-end in a linear, stacked configuration called a string. A common set of piping comprised of a suitable high temperature resistant material (1) provides fuel and air to each module housing, (2) serves as electrically conducting buses, and (3) provides structural support for a string of SOFC modules. Ceramic collars are used to connect fuel and air inlet piping to each of the electrodes in an SOFC module and provide (1) electrical insulation for the current carrying bus bars and gas manifolds, (2) damping for the fuel and air inlet piping, and (3) proper spacing between the fuel and air inlet piping to prevent contact between these tubes and possible damage to the SOFC. 11 figs.
$SO(10)$ Grand Unification from $M$ theory on a $G_2$ manifold
Miguel Crispim Romão
2015-02-20T23:59:59.000Z
We consider Grand Unified Theories based on $SO(10)$ which originate from $M$ theory on $G_2$ manifolds. In this framework we are naturally led to a novel solution of the doublet-triplet splitting problem involving an extra $\\overline{{\\bf 16}}_X+{\\bf 16}_X$ vector-like pair by considering discrete symmetries of the extra dimensions and preserving unification. Since Wilson line breaking preserves the rank of the gauge group, the necessary $U(1)$ gauge breaking is generated from extra multiplets. The main prediction of the approach is the existence of light states with the quantum numbers of a $\\overline{{\\bf 16}}_X+{\\bf 16}_X$ vector-like pair which could show up in future LHC searches.
$SO(10)$ Grand Unification from $M$ theory on a $G_2$ manifold
Romão, Miguel Crispim
2015-01-01T23:59:59.000Z
We consider Grand Unified Theories based on $SO(10)$ which originate from $M$ theory on $G_2$ manifolds. In this framework we are naturally led to a novel solution of the doublet-triplet splitting problem involving an extra $\\overline{{\\bf 16}}_X+{\\bf 16}_X$ vector-like pair by considering discrete symmetries of the extra dimensions and preserving unification. Since Wilson line breaking preserves the rank of the gauge group, the necessary $U(1)$ gauge breaking is generated from extra multiplets. The main prediction of the approach is the existence of light states with the quantum numbers of a $\\overline{{\\bf 16}}_X+{\\bf 16}_X$ vector-like pair which could show up in future LHC searches.
The quintic nonlinear Schr\\"odinger equation on three-dimensional Zoll manifolds
Herr, Sebastian
2011-01-01T23:59:59.000Z
Let (M,g) be a three-dimensional smooth compact Riemannian manifold such that all geodesics are simple and closed with a common minimal period, such as the 3-sphere S^3 with canonical metric. In this work the global well-posedness problem for the quintic nonlinear Schr\\"odinger equation i\\partial_t u+\\Delta u=\\pm|u|^4u, u|_{t=0}=u_0 is solved for small initial data u_0 in the energy space H^1(M), which is the scaling-critical space. Moreover, local well-posedness is shown for large data, as well as persistence of higher initial Sobolev regularity. This extends previous results of Burq-G\\'erard-Tzvetkov to the endpoint case.
P. M. Sutter; Tsunefumi Tanaka
2006-10-11T23:59:59.000Z
Although the observed universe appears to be geometrically flat, it could have one of 18 global topologies. A constant-time slice of the spacetime manifold could be a torus, Mobius strip, Klein bottle, or others. This global topology of the universe imposes boundary conditions on quantum fields and affects the vacuum energy density via Casimir effect. In a spacetime with such a nontrivial topology, the vacuum energy density is shifted from its value in a simply-connected spacetime. In this paper, the vacuum expectation value of the stress-energy tensor for a massless scalar field is calculated in all 17 multiply-connected, flat and homogeneous spacetimes with different global topologies. It is found that the vacuum energy density is lowered relative to the Minkowski vacuum level in all spacetimes and that the stress-energy tensor becomes position-dependent in spacetimes that involve reflections and rotations.
Leonid Lantsman
2010-08-17T23:59:59.000Z
We intend to show that the vacuum manifold inherent in the Minkowskian non-Abelian model involving Higgs and Yang-Mills BPS vacuum modes and herewith quantized by Dirac can be described with the help of the superselection rules if and only if the "discrete" geometry for this vacuum manifold is assumed (it is just a necessary thing in order justify the Dirac fundamental quantization scheme applied to the mentioned model) and only in the infinitely narrow spatial region of the cylindrical shape where topologically nontrivial vortices are located inside this discrete vacuum manifold.
Gary D. Bourn; Ford A. Phillips; Ralph E. Harris
2005-12-01T23:59:59.000Z
This document provides results and conclusions for Task 15.0--Detailed Analysis of Air Balance & Conceptual Design of Improved Air Manifolds in the ''Technologies to Enhance the Operation of Existing Natural Gas Compression Infrastructure'' project. SwRI{reg_sign} is conducting this project for DOE in conjunction with Pipeline Research Council International, Gas Machinery Research Council, El Paso Pipeline, Cooper Compression, and Southern Star, under DOE contract number DE-FC26-02NT41646. The objective of Task 15.0 was to investigate the perceived imbalance in airflow between power cylinders in two-stroke integral compressor engines and develop solutions via manifold redesign. The overall project objective is to develop and substantiate methods for operating integral engine/compressors in gas pipeline service, which reduce fuel consumption, increase capacity, and enhance mechanical integrity.
Quantization of the relativistic fluid in physical phase space on Kaehler manifolds
Holender, L.; Vancea, I. V. [Departamento de Fisica, Universidade Federal Rural do Rio de Janeiro (UFRRJ), Cx. Postal 23851, 23890-000 Seropedica (Brazil); Santos, M. A. [Departamento de Fisica e Quimica, Universidade Federal do Espirito Santo (UFES), Avenida Fernando Ferarri S/N-Goiabeiras, 29060-900 Vitoria (Brazil)
2008-02-15T23:59:59.000Z
We discuss the quantization of a class of relativistic fluid models defined in terms of one real and two complex conjugate potentials with values on a Kaehler manifold, and parametrized by the Kaehler potential K(z,z) and a real number {lambda}. In the Hamiltonian formulation, the canonical conjugate momenta of the potentials are subjected to second-class constraints which allow us to apply the symplectic projector method in order to find the physical degrees of freedom and the physical Hamiltonian. We construct the quantum theory for that class of models by employing the canonical quantization methods. We also show that a semiclassical theory in which the Kaehler and the complex potentials are not quantized has a highly degenerate vacuum. We define and compute the quantum topological number (quantum linking number) operator which has nonvanishing contributions from the Kaehler and complex potentials only. Also, we show that the vacuum and the states formed by tensoring the number operators eigenstates have zero linking number, and show that linear combinations of the tensor product of number operators eigenstates which have the form of entangled states have nonzero linking number.
The landscape of G-structures in eight-manifold compactifications of M-theory
Babalic, Elena Mirela
2015-01-01T23:59:59.000Z
We consider spaces of "virtual" constrained generalized Killing spinors, i.e. spaces of Majorana spinors which correspond to "off-shell" $s$-extended supersymmetry in compactifications of eleven-dimensional supergravity based on eight-manifolds $M$. Such spaces naturally induce two stratifications of $M$, called the chirality and stabilizer stratification. For the case $s=2$, we describe the former using the canonical Whitney stratification of a three-dimensional semi-algebraic set ${\\cal R}$. We also show that the stabilizer stratification coincides with the rank stratification of a cosmooth generalized distribution ${\\cal D}_0$ and describe it explicitly using the Whitney stratification of a four-dimensional semi-algebraic set $\\mathfrak{P}$. The stabilizer groups along the strata are isomorphic with $\\mathrm{SU}(2)$, $\\mathrm{SU}(3)$, $\\mathrm{G}_2$ or $\\mathrm{SU}(4)$, where $\\mathrm{SU(2)}$ corresponds to the open stratum, which is generically non-empty. We also determine the rank stratification of a lar...
The landscape of G-structures in eight-manifold compactifications of M-theory
Elena Mirela Babalic; Calin Iuliu Lazaroiu
2015-05-09T23:59:59.000Z
We consider spaces of "virtual" constrained generalized Killing spinors, i.e. spaces of Majorana spinors which correspond to "off-shell" $s$-extended supersymmetry in compactifications of eleven-dimensional supergravity based on eight-manifolds $M$. Such spaces naturally induce two stratifications of $M$, called the chirality and stabilizer stratification. For the case $s=2$, we describe the former using the canonical Whitney stratification of a three-dimensional semi-algebraic set ${\\cal R}$. We also show that the stabilizer stratification coincides with the rank stratification of a cosmooth generalized distribution ${\\cal D}_0$ and describe it explicitly using the Whitney stratification of a four-dimensional semi-algebraic set $\\mathfrak{P}$. The stabilizer groups along the strata are isomorphic with $\\mathrm{SU}(2)$, $\\mathrm{SU}(3)$, $\\mathrm{G}_2$ or $\\mathrm{SU}(4)$, where $\\mathrm{SU(2)}$ corresponds to the open stratum, which is generically non-empty. We also determine the rank stratification of a larger generalized distribution ${\\cal D}$ which turns out to be integrable in the case of compactifications down to $\\mathrm{AdS}_3$.
Manifold, bus support and coupling arrangement for solid oxide fuel cells
Parry, Gareth W. (East Windsor, CT)
1989-01-01T23:59:59.000Z
Individual, tubular solid oxide fuel cells (SOFCs) are assembled into bundles called a module within a housing, with a plurality of modules arranged end-to-end in a linear, stacked configuration called a string. A common set of piping comprised of a suitable high temperture resistant material (1) provides fuel and air to each module housing, (2) serves as electrically conducting buses, and (3) provides structural support for a string of SOFC modules. The piping thus forms a manfold for directing fuel and air to each module in a string and makes electrical contact with the module's anode and cathode to conduct the DC power generated by the SOFC. The piping also provides structureal support for each individual module and maintains each string of modules as a structurally integral unit for ensuring high strength in a large 3-dimensional array of SOFC modules. Ceramic collars are used to connect fuel and air inlet piping to each of the electrodes in an SOFC module and provide (1) electrical insulation for the current carrying bus bars and gas manifolds, (2) damping for the fuel and air inlet piping, and (3) proper spacing between the fuel and air inlet piping to prevent contact between these tubes and possible damage to the SOFC.
Space-Time as an Orderparameter Manifold in Random Networks and the Emergence of Physical Points
Manfred Requardt
1999-02-11T23:59:59.000Z
In the following we are going to describe how macroscopic space-time is supposed to emerge as an orderparameter manifold or superstructure floating in a stochastic discrete network structure. As in preceeding work (mentioned below), our analysis is based on the working philosophy that both physics and the corresponding mathematics have to be genuinely discrete on the primordial (Planck scale) level. This strategy is concretely implemented in the form of cellular networks and random graphs. One of our main themes is the development of the concept of physical (proto)points as densely entangled subcomplexes of the network and their respective web, establishing something like (proto)causality. It max perhaps be said that certain parts of our programme are realisations of some old and qualitative ideas of Menger and more recent ones sketched by Smolin a couple of years ago. We briefly indicate how this two-story-concept of space-time can be used to encode the (at least in our view) existing non-local aspects of quantum theory without violating macroscopic space-time causality!
Constructing vacuum spacetimes by generating manifolds of revolution around a curve
Vee-Liem Saw
2015-06-23T23:59:59.000Z
We develop a general perturbative analysis on vacuum spacetimes which can be constructed by generating manifolds of revolution around a curve, and apply it to the Schwarzschild metric. The following different perturbations are carried out separately: 1) Non-rotating 2-spheres are added along a plane curve slightly deviated from the "Schwarzschild line"; 2) General non-rotating topological 2-spheres are added along the "Schwarzschild line" 3) Slow-rotating 2-spheres are added along the "Schwarzschild line". For (1), we obtain the first order vacuum solution and show that no higher order solution exists. This linearised vacuum solution turns out however to be just a gauge transformation of the Schwarzschild metric. For (2), we solve the general linearised vacuum equations under several special cases. In particular, there exist linearised vacuum solutions with signature-changing metrics (though these do not correspond to adding topological 2-spheres). For (3), we find that the first order vacuum solution is equivalent to the slowly rotating Kerr metric. This is hence a much simpler and geometrically insightful derivation as compared to the gravitomagnetic one, where this rotating-shells construction is a direct manifestation of the frame-dragging phenomenon. We also show that the full Kerr however, cannot be obtained via adding rotating ellipsoids.
Grant L. Hawkes; James E. O'Brien; Greg Tao
2011-11-01T23:59:59.000Z
A three-dimensional computational fluid dynamics (CFD) electrochemical model has been created to model high-temperature electrolysis cell performance and steam electrolysis in an internally manifolded planar solid oxide electrolysis cell (SOEC) stack. This design is being evaluated at the Idaho National Laboratory for hydrogen production from nuclear power and process heat. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the SOEC mode. Model results provide detailed profiles of temperature, operating potential, steam-electrode gas composition, oxygen-electrode gas composition, current density and hydrogen production over a range of stack operating conditions. Single-cell and five-cell results will be presented. Flow distribution through both models is discussed. Flow enters from the bottom, distributes through the inlet plenum, flows across the cells, gathers in the outlet plenum and flows downward making an upside-down ''U'' shaped flow pattern. Flow and concentration variations exist downstream of the inlet holes. Predicted mean outlet hydrogen and steam concentrations vary linearly with current density, as expected. Effects of variations in operating temperature, gas flow rate, oxygen-electrode and steam-electrode current density, and contact resistance from the base case are presented. Contour plots of local electrolyte temperature, current density, and Nernst potential indicate the effects of heat transfer, reaction cooling/heating, and change in local gas composition. Results are discussed for using this design in the electrolysis mode. Discussion of thermal neutral voltage, enthalpy of reaction, hydrogen production, cell thermal efficiency, cell electrical efficiency, and Gibbs free energy are discussed and reported herein.
Thomas Laetsch
2013-05-17T23:59:59.000Z
This paper gives a rigorous interpretation of a Feynman path integral on a Riemannian manifold M with non-positive sectional curvature. A $L^2$ Riemannian metric $G_P$ is given on the space of piecewise geodesic paths $H_P(M)$ adapted to the partition $P$ of $[0,1]$, whence a finite-dimensional approximation of Wiener measure is developed. It is proved that, as $mesh(P) \\to 0$, the approximate Wiener measure converges in a $L^1$ sense to the measure $e^{-\\frac{2 + \\sqrt{3}}{20\\sqrt{3}} \\int_0^1 Scal(\\sigma(s)) ds} d\
Ohbuchi, Ryutarou
Takahiko Furuya and Ryutarou Ohbuchi, Diffusion-on-Manifold Aggregation of Local Features for Shape-based 3D Model Retrieval, accepted as oral paper, Proc. ACM International Conference on Multimedia Information Retrieval (ICMR) 2015, Shanghai, China. 1 Diffusion-on-Manifold Aggregation of Local Features
Fine, Dana S., E-mail: dfine@umassd.edu [Mathematics Department, University of Massachusetts Dartmouth, North Dartmouth, Massachusetts 02747 (United States); Sawin, Stephen, E-mail: ssawin@fairfield.edu [Mathematics Department, Fairfield University, Fairfield, Connecticut 06824 (United States)
2014-06-15T23:59:59.000Z
Following Feynman's prescription for constructing a path integral representation of the propagator of a quantum theory, a short-time approximation to the propagator for imaginary-time, N = 1 supersymmetric quantum mechanics on a compact, even-dimensional Riemannian manifold is constructed. The path integral is interpreted as the limit of products, determined by a partition of a finite time interval, of this approximate propagator. The limit under refinements of the partition is shown to converge uniformly to the heat kernel for the Laplace-de Rham operator on forms. A version of the steepest descent approximation to the path integral is obtained, and shown to give the expected short-time behavior of the supertrace of the heat kernel.
Benchmark Evaluation of Uranium Metal Annuli and Cylinders with Beryllium Reflectors
John D. Bess
2010-06-01T23:59:59.000Z
An extensive series of delayed critical experiments were performed at the Oak Ridge Critical Experiments Facility using enriched uranium metal during the 1960s and 1970s in support of criticality safety operations at the Y-12 Plant. These experiments were designed to evaluate the storage, casting, and handling limits of the Y-12 Plant and to provide data for the verification of cross sections and calculation methods utilized in nuclear criticality safety applications. Many of these experiments have already been evaluated and included in the International Criticality Safety Benchmark Evaluation Project (ICSBEP) Handbook: unreflected (HEU-MET-FAST-051), graphite-reflected (HEU-MET-FAST-071), and polyethylene-reflected (HEU-MET-FAST-076). Three of the experiments consisted of highly-enriched uranium (HEU, ~93.2% 235U) metal parts reflected by beryllium metal discs. The first evaluated experiment was constructed from a stack of 7-in.-diameter, 4-1/8-in.-high stack of HEU discs top-reflected by a 7-in.-diameter, 5-9/16-in.-high stack of beryllium discs. The other two experiments were formed from stacks of concentric HEU metal annular rings surrounding a 7-in.diameter beryllium core. The nominal outer diameters were 13 and 15 in. with a nominal stack height of 5 and 4 in., respectively. These experiments have been evaluated for inclusion in the ICSBEP Handbook.
Turning Moment of Rotating Inner Cylinder in the Entry Region of Concentric Annuli*
Al-Qahtani, Mohammad
rotating walls is of practical importance in many industrial applications. In the field of electric motors temperature to less than the maximum allowable value. In the fields of axial flow pumps, mixers and other for compact rotary heat exchangers and combus- tion chambers. These possible future applicatio~is depend
Colbert, John Wesley
1993-01-01T23:59:59.000Z
GEOMETRY Inclination (angle from vertical) Annular Dimensions Rotary Speed Drill Pipe Eccentricity t Variable Drillpipe O. D, - 1. 13 inches Hole I. D ? 2. 0 inches Ok 50rpm 75 % DRILLING FLUID Fluid Annular Velocity Flow Regime Density Water... then there will be adequate cuttings removal. However, for deviated wellbores the cuttings slip velocity is no longer parallel to the direction of flow, but as the angle of inclination (from the vertical) increases, the component of the gravitational force normal...
Colbert, John Wesley
1993-01-01T23:59:59.000Z
' are critical not just because the beds slide downward against flow, but also because upon circulation disruption the beds avalanche to the bottom. In 1991, Becker, Qkrajni, and Azar, published results of their experimental studies of the effect of mud... in suspension in the circulating fluid. In addition, they described seven different slurry flow patterns; homogeneous suspension, heterogeneous suspension, saltation, clusters, dunes, continuous moving beds and stationary beds. They concluded: 1...
AHF: Array-Based Half-Facet Data Structure for Mixed-Dimensional and Non-Manifold Meshes
Dyedov, Volodymyr; Ray, Navamita; Einstein, Daniel R.; Jiao, Xiangmin; Tautges, T.
2014-08-31T23:59:59.000Z
We present an Array-based Half-Facet mesh data structure, or AHF, for efficient mesh query and modification operations. The AHF extends the compact array-based half-edge and half-face data structures (T.J. Alumbaugh and X. Jiao, Compact array-based mesh data structures, IMR, 2005) to support mixed-dimensional and non-manifold meshes. The design goals of our data structure include generality to support such meshes, efficiency of neighborhood queries and mesh modification, compactness of memory footprint, and facilitation of interoperability of mesh-based application codes. To accomplish these goals, our data structure uses sibling half-facets as a core abstraction, coupled with other explicit and implicit representations of entities. A unique feature of our data structure is a comprehensive implementation in MATLAB, which allows rapid prototyping, debugging, testing, and deployment of meshing algorithms and other mesh-based numerical methods. We have also developed C++ implementation built on top of MOAB (T.J. Tautges, R. Meyers, and K. Merkley, MOAB: A Mesh-Oriented Database, Sandia National Laboratories, 2004). We present some comparisons of the memory requirements and computational costs, and also demonstrate its effectiveness with a few sample applications.
Not Available
1991-09-01T23:59:59.000Z
The design of a CGMCFC electric generation plant that will provide a cost of eletricity (COE) which is lower than that of current electric generation technologies and which is competitive with other long-range electric generating systems is presented. This effort is based upon the Internal Manifold Heat Exchanger (IMHEX) technology as developed by the Institute of Gas Technology (IGT). The project was executed by selecting economic and performance objectives for alternative plant arrangements while considering process constraints identified during IMHEX fuel cell development activities at ICT. The four major subsystems of a coal-based MCFC power plant are coal gasification, gas purification, fuel cell power generation and the bottoming cycle. The design and method of operation of each subsystem can be varied, and, depending upon design choices, can have major impact on both the design of other subsystems and the resulting cost of electricity. The challenge of this project was to select, from a range of design parameters, those operating conditions that result in a preferred plant design. Computer modelling was thus used to perform sensitivity analyses of as many system variables as program resources and schedules would permit. In any systems analysis, it is imperative that the evaluation methodology be verifiable and comparable. The TAG Class I develops comparable (if imprecise) data on performance and costs for the alternative cases being studied. It identifies, from a range of options, those which merit more exacting scrutiny to be undertaken at the second level, TAG class II analysis.
Alternating projections on manifolds
2006-07-27T23:59:59.000Z
Jul 27, 2006 ... The survey ar- ticle [BB96] covers ... ?School of Operations Research and Industrial Engineering, Cornell University, Ithaca,. NY 14853, U.S.A. ...
Probabilistic and Statistical Analysis of Perforated Patterns
Misailovic, Sasa
2011-01-19T23:59:59.000Z
We present a new foundation for the analysis and transformation of computer programs.Standard approaches involve the use of logical reasoning to prove that the applied transformation does not change the observable semantics ...
Raffray, A. René
2014-01-01T23:59:59.000Z
, assembly and maintenance, Fusion Eng. Des. (2014), http://dx.doi.org/10.1016/j.fusengdes.2014.elsevier.com/locate/fusengdes ITER blanket manifold system: Integration, assembly and maintenance Alex Martina, , George Dellopoulosb failure would prevent ITER operation a maintenance strategy has been planned. © 2014 Elsevier B.V. All
Not Available
1991-09-01T23:59:59.000Z
The design of a CGMCFC electric generation plant that will provide a cost of eletricity (COE) which is lower than that of current electric generation technologies and which is competitive with other long-range electric generating systems is presented. This effort is based upon the Internal Manifold Heat Exchanger (IMHEX) technology as developed by the Institute of Gas Technology (IGT). The project was executed by selecting economic and performance objectives for alternative plant arrangements while considering process constraints identified during IMHEX fuel cell development activities at ICT. The four major subsystems of a coal-based MCFC power plant are coal gasification, gas purification, fuel cell power generation and the bottoming cycle. The design and method of operation of each subsystem can be varied, and, depending upon design choices, can have major impact on both the design of other subsystems and the resulting cost of electricity. The challenge of this project was to select, from a range of design parameters, those operating conditions that result in a preferred plant design. Computer modelling was thus used to perform sensitivity analyses of as many system variables as program resources and schedules would permit. In any systems analysis, it is imperative that the evaluation methodology be verifiable and comparable. The TAG Class I develops comparable (if imprecise) data on performance and costs for the alternative cases being studied. It identifies, from a range of options, those which merit more exacting scrutiny to be undertaken at the second level, TAG class II analysis.
Balajewicz, Maciej; Dowell, Earl
2015-01-01T23:59:59.000Z
For a projection-based reduced order model (ROM) to be stable and accurate, the dynamics of the truncated subspace must be taken into account. This paper proposes an approach for stabilizing and enhancing projection-based fluid ROMs in which truncated modes are accounted for \\textit{a priori} via a minimal rotation of the projection subspace. Attention is focused on the full non-linear compressible Navier-Stokes equations in specific volume form as a step toward a more general formulation for problems with generic non-linearities. Unlike traditional approaches, no empirical turbulence modeling terms are required, and consistency between the ROM and the full order model from which the ROM is derived is maintained. Mathematically, the approach is formulated as a quadratic matrix program on the Stiefel manifold. The reproductive as well as predictive capabilities of the method are evaluated on several compressible flow problems, including a problem involving laminar flow over an airfoil with a high angle of atta...
TOPIC I: MANIFOLDS AND MORSE THEORY Manifolds and Riemannian Geometry
Sum: Poincare-Hopf Theorem, Gauss Mapping Framed Cobordisms The Pontryagin Construction Product, Canonical, Normal, and Conormal Sheaves 4. Geometric Genus H. Cohomology of Sheaves and of a Noetherian Affine Scheme I. Cech Cohomology K. Riemann-Roch Theorem for Curves and Surfaces 1. Canonical Divisor
Simplicial isotopies in 3-manifolds
O'Donnell, Daniel Francis
1974-01-01T23:59:59.000Z
(Z), and (2) n(T2) & 26. Analogously, a triangulation I of 2 1 Bd(C ) can be found satisfying these same conditions. A triangulation T is defined so that if s is a 3-simplex of T, then s is of the form plw for w c I)2, or of the form s. w, 1 where s. is a... i a locally fi ite collection or r-simplexes (r = O, . . . , p) so that (1) if two of the simplexes have a point in common, their intersection is a j-simplex, where 0 & j & p ? 1, and (2) the union of T is N. We let n(T ) = Card T , where...
Finsler manifolds with general symmetries
Latifi, Dariush
2012-01-01T23:59:59.000Z
In this paper, we study generalized symmetric Finsler spaces. We first study symmetry preserving diffeomorphisms, then we show that the group of symmetry preserving diffeomorphisms is a transitive Lie transformation group. Finally we give some existence theorems.
Controlling manifold covers of orbifolds
McReynolds, D B
2009-01-01T23:59:59.000Z
In this article we prove a generalization of Selberg's lemma on the existence of torsion free, finite index subgroups of arithmetic groups. Some of the geometric applications are the resolution a conjecture of Nimershiem and answers to questions of Long-Reid and the author.
Shelling in low dimensional manifolds
Murray, William Owen
1974-01-01T23:59:59.000Z
with faces in Bd(Mk) may be shelled from M ? g. Since each of the remaining simplexes of C has a face in the disk C fl Cl[M? ? C ], the shelling order for C f) Cl[M ? C ], given by Lemma 2. 1 can be used to shell off the corresponding 3- simplexes in Ck... F (p)x. If x t Bd(P) fl E, t then px and F (p)x lie in E for all t t [0, 1] so F leaves E invariant. t 3 Since P lies in U, F is fixed on E ? U and clearly deforms D onto Cl[D ? g']. For each t, F is linear on the following 3-simplexes. tl = viv3...
The learnability of abstract syntactic principles Amy Perfors a,
Regier, Terry
: Received 30 June 2010 Accepted 1 November 2010 Available online 24 December 2010 Keywords: Poverty structures. In outline form, this is one version of the ``Poverty of the Stimulus'' (or PoS) argument
Bloch states, universality in light transport through a perforated metal
Gevorkian, Zh S; Cuevas, Emilio
2015-01-01T23:59:59.000Z
Light transport in a metal with hole arrays is considered.Analytical expressions for a normal incident lights transmission coefficient in a metallic system with periodic, isolated and disordered holes are obtained and analyzed. Special attention is paid to the phenomenon of an extraordinary transmittance. It was proven that a sufficient condition for such extraordinary behavior is a long-range order in the dielectric permittivity profile. Based on the extended Bloch states model a ladder structure and universal behavior for a transmission spectra is predicted. The resonance wavelength of a transmission spectra is found for the Kronig-Penney model. The role of surface plasmons is discussed.
Managing performance vs. accuracy trade-offs with loop perforation
Sidiroglou, Stelios
Many modern computations (such as video and audio encoders, Monte Carlo simulations, and machine learning algorithms) are designed to trade off accuracy in return for increased performance. To date, such computations ...
Strongly Perforated K0-Groups of Simple C ?-Algebras
0 ? Coker b1?? ? K?A ? Ker b? ? 0. In particular, if .... (where xi,j is a point in Xi,j to be specified and 1dim(pj ) is the unit of theCj ?Mdim(pj )) and ?i,j(a) = a ...
Cottle, John Ernest
1948-01-01T23:59:59.000Z
&opere poser t-t vari, bio "ransformr. i oo t'. t t!ie ! o-t oii-'? it to ! h liquiu could bo adeustod. "'nis rran, cmont per&aitted t. '. o, . inc. &&ance of t. '. e li&;uid temp rature t iCG P plus or minus 0, 1 P. all liquid aial air temperatures of tlic... without bio"!in, the liquid out of the ma&master and the connections available leaked. Since the plate pressure drop was unimportant ~?ay~, tne manometer was ab ndoned after the first fow r&&ns were mode. In a commercial oolumn r&here liquid...
Dark energy and 3-manifold topology
Torsten Asselmeyer-Maluga; Helge Rose
2007-11-21T23:59:59.000Z
We show that the differential-geometric description of matter by differential structures of spacetime leads to a unifying model of the three types of energy in the cosmos: matter, dark matter and dark energy. Using this model we are able to calculate the ratio of dark energy to the total energy of the cosmos.
Manifold free multiple sheet superplastic forming
Elmer, John W. (Danville, CA); Bridges, Robert L. (Knoxville, TN)
2001-01-01T23:59:59.000Z
Fluid-forming compositions in a container attached to enclosed adjacent sheets are heated to relatively high temperatures to generate fluids (gases) that effect inflation of the sheets. Fluid rates to the enclosed space between the sheets can be regulated by the canal from the container. Inflated articles can be produced by a continuous, rather than batch-type, process.
Manifold free multiple sheet superplastic forming
Elmer, John W.; Bridges, Robert L.
2004-01-13T23:59:59.000Z
Fluid-forming compositions in a container attached to enclosed adjacent sheets are heated to relatively high temperatures to generate fluids (gases) that effect inflation of the sheets. Fluid rates to the enclosed space between the sheets can be regulated by the canal from the container. Inflated articles can be produced by a continuous, rather than batch-type, process.
Spin(7) holonomy manifold and Superconnection
Yasui, Y; Yasui, Yukinori; Ootsuka, Takayoshi
2001-01-01T23:59:59.000Z
We discuss the higher dimensional generalization of gravitational instantons by using volume-preserving vector fields. We give special attention to the case of 8-dimensions and present a new construction of the Ricci flat metric with holonomy in Spin(7). An example of the metric is explicitly given. Further it is shown that our formulation has a natural interpretation in the Chern-Simons theory written by the language of superconnections.
Spin(7) holonomy manifold and Superconnection
Yukinori Yasui; Takayoshi Ootsuka
2000-10-09T23:59:59.000Z
We discuss the higher dimensional generalization of gravitational instantons by using volume-preserving vector fields. We give special attention to the case of 8-dimensions and present a new construction of the Ricci flat metric with holonomy in Spin(7). An example of the metric is explicitly given. Further it is shown that our formulation has a natural interpretation in the Chern-Simons theory written by the language of superconnections.
A Dark Energy Model in Lyra Manifold
Hoavo Hova
2012-04-11T23:59:59.000Z
We consider, in normal-gauge Lyra's geometry, evolution of a homogeneous isotropic universe in a gravitational model involving only the standard matter in interaction with a displacement vector field $\\phi_{\\mu}$. Considering both constant and time-dependent displacement vector field we show that the observed cosmic acceleration could be explained without considering an alien energy component with a negative pressure.
A Dark Energy Model in Lyra Manifold
Hova, Hoavo
2012-01-01T23:59:59.000Z
We consider, in normal-gauge Lyra's geometry, evolution of a homogeneous isotropic universe in a gravitational model involving only the standard matter in interaction with a displacement vector field $\\phi_{\\mu}$. Considering both constant and time-dependent displacement vector field we show that the observed cosmic acceleration could be explained without considering an alien energy component with a negative pressure.
Modular manifold for integrated fluidics and electronics
Adkins, Douglas Ray (Albuquerque, NM)
2010-03-30T23:59:59.000Z
An airtight preconcentrator housing and/or a sensor housing for chemical testing, the housing(s) comprising internal dimensions such that a pre-manufactured preconcentrator and/or sensor can be disposed therein. The housings can also comprise electrical contacts disposed therein which align with and thus provide electrical connection to the preconcentrator and/or sensor. The preconcentrator and/or sensor can be easily and quickly replaced.
DIRECT SEARCH ALGORITHMS OVER RIEMANNIAN MANIFOLDS ...
2007-01-08T23:59:59.000Z
an element ? ? T¯pM such that the geodesic ?pn+1 ¯p(?) . = Exp¯p(??) ..... of the points p1,...,pm ? G(n, k) [2, 11]. A point p ...... Optimization, 9:112–147, 1998.
Subsea Manifolds | OpenEI Community
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a g eWorks -09-0018-CXNuonYucheng XinyuanStresni Burza S R O Jump to: navigation,Subsea
OpenEI Community - Subsea Manifolds
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh Plains WindInformationNVN-079666NewOlsen Wind Farm JumpWrap-upHighlights from
OpenEI Community - Subsea Manifolds Market
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh Plains WindInformationNVN-079666NewOlsen Wind Farm JumpWrap-upHighlights from
LARGE RIEMANNIAN MANIFOLDS WHICH FLEXIBLE DRANISHNIKO STEVEN
Weinberger, Shmuel
integr degr ee,r espectively). See §4 for definitions elabor ations. Her e ar e our mainr Theorem give n
COMPLEX HYPERBOLIC MANIFOLDS HOMOTOPY EQUIVALENT TO
Goldman, William
Institute, the Sonderforschungsbereich 256 in Bonn and the VolkswagenStiftung (ResearchinPairs program
Design and Transient Analysis of Passive Safety Cooling Systems for Advanced Nuclear Reactors
Galvez, Cristhian
2011-01-01T23:59:59.000Z
electric heaters, jet pumps, turbines, separators, annuli, pressurizers, accumulators, and power control system components. In addition, special process models
Head Loss Through Fibrous Debris Bed with Different Types of Perforated Strainers
Abdulsattar, Suhaeb S
2014-05-03T23:59:59.000Z
than the randomly generated debris bed on the sump strainer of the NPP. The U.S. NRC began their analysis in 1996 in order to predict and estimate the loss of the Net Positive Suction Head (NPSH) by establishing GSI-191. In 1995, NUREG/CR-6224....0964 ft3 (0.00273 m3). The density of the NUKON debris particle was specified to be equal to 2.88 g/cm3 in the (NURE/CR- 6224), however, it was specified to be 2.5 g/cm3 according to the NUKON insulation Material Safety Data Sheet (MSDS)[10...
Rinard, Martin C.
Traditional program transformations operate under the onerous constraint that they must preserve the exact behavior of the transformed program. But many programs are designed to produce approximate results. Lossy video ...
Carbajal, Luis
2015-01-01T23:59:59.000Z
Heat build-up in prosthetic sockets is a significant problem experienced by many amputees in America, with no central solution in sight. Heat and discomfort accounts for over 70% of problems experienced by lower limb ...
Functional MRI To Evaluate “Sense of Self” following Perforator Flap Breast Reconstruction
Caterson, Stephanie A.
Background: Breast reconstruction is associated with high levels of patient satisfaction. Previous patient satisfaction studies have been subjective. This study utilizes functional magnetic resonance imaging (fMRI) to ...
Using Code Perforation to Improve Performance, Reduce Energy Consumption, and Respond to Failures
Agarwal, Anant
2009-09-03T23:59:59.000Z
Many modern computations (such as video and audio encoders, Monte Carlo simulations, and machine learning algorithms) are designed to trade off accuracy in return for increased performance. To date, such computations ...
Augustinack, Jean
Ex vivo magnetic resonance imaging yields high resolution images that reveal detailed cerebral anatomy and explicit cytoarchitecture in the cerebral cortex, subcortical structures, and white matter in the human brain. Our ...
Exploring the effectiveness of loop perforation for quality of service profiling
Misailovíc, Saša
2010-01-01T23:59:59.000Z
Many computations exhibit a trade off between execution time and quality of service. A video encoder, for example, can often encode frames more quickly if it is given the freedom to produce slightly lower quality video. A ...
Characteristics of countercurrent vapor-liquid flow at a perforated plate
Sutherland, Samuel Shelton
1958-01-01T23:59:59.000Z
bars to form 0he slots. It is stated (I) that Turbogrid trays have been used successfully in a var1ety of dist1llation columns op- erating at pressures from 5 psia to 300 psig with vapor densities from 0. 00 to 2, 8 pounds per cubic foot. It i... of liquid. In view of this Hai was taken to be the level of spray which filled the whole cross-sectional area of the column. In such cases the spray in the center of the col- umn extended I to 2 1nches higher. In order to collect the water entrained...
Head Loss Through Fibrous Debris Bed with Different Types of Perforated Strainers
Abdulsattar, Suhaeb S
2014-05-03T23:59:59.000Z
and becomes an important cause of head loss through the sump strainer, affecting the Emergency Core Cooling System (ECCS) performance. This study was dedicated to measure the pressure drop across randomly accumulated debris bed on the sump strainer along...
Large-Eddy Simulation of the Acoustic Response of a Perforated Plate
Nicoud, Franck
the unsteady combustion process and the acoustic modes in the chamber. Notably, in aeronautical gas turbines the shape of the jet separation at the aperture inlet. II. Introduction Nowadays, competitive gas turbines have to prove a low pollutant emission capability. This is often ob- tained by using lean combustion
Acoustic modeling of perforated plates with bias flow for Large-Eddy Simulations
Mendez, Simon
is then addressed in the context of thermo- acoustic instabilities of gas turbine combustion chambers. Details, competitive gas turbines have to prove a low pollutant emission capability. For example, Lean Premixed and the acoustic modes in the chamber. Notably, in aeronautical gas turbines, one needs to consider the fact
High frequency acoustic transmission loss of perforated plates at normal incidence
Papamoschou, Dimitri
control valves. Aeroengine acoustic liners and automotive muffler are classified as reac- tive silencers.1- cies such as, for example, the blade passing frequency of a rotor or the firing frequency plates are also used in mufflers for flow control valves, particularly pneumatic bleed valves on gas
Scrotal Swelling After Penetrating Chest Trauma
Heiner, Jason D; Skeins, Elizabeth C; DeVita, Diane; Litner, Joseph S
2009-01-01T23:59:59.000Z
intestinal or gastric perforation and pneumothorax. 1,2after intestinal perforation or infection. Spontaneous
Rose, Amy; Robinson, Maria; Kamino, Hideko; Latkowski, Jo-Ann
2012-01-01T23:59:59.000Z
xanthogranuloma leading to perforation. Arch Ophthalmolconjunctivitis, and corneal perforation [ 2 , 4 ]. The
Early Presentation of Buried Bumper Syndrome
Geer, Walter; Jeanmonod, Rebecca K.
2013-01-01T23:59:59.000Z
tube dysfunction, gastric perforation, bleeding, peritonitisacute bleeding, esophageal perforation, or aspiration, are
The Missing Percutaneous Endoscopic Gastrostomy Tube
Robinson, Darlene Y; Hamilton, Amber V
2010-01-01T23:59:59.000Z
through gastric wall Perforation Fistula Hemorrhagesigns of obstruction and perforation. A foreign body such as
GROUPOIDS AND AN INDEX THEOREM FOR CONICAL PSEUDO-MANIFOLDS
Nistor, Victor
] as well as [6, 26, 45, 46]. The index theorem for families and Bismut's superconnection formalism play
A Morse complex for infinite dimensional manifolds Alberto Abbondandolo
Abbondandolo, Alberto
, . . . , dim M, Scuola Normale Superiore di Pisa, Piazza dei Cavalieri 7, 56126 Pisa, Italy, e-mail: abbo@sns.it. Dipartimento di Matematica "L. Tonelli", via Buonarroti 2, 56127 Pisa, Italy, e-mail: majer@dm.unipi.it 1The
A GEOMETRIC FRAMEWORK FOR TRANSFER LEARNING USING MANIFOLD ALIGNMENT
Massachusetts at Amherst, University of
by: Sridhar Mahadevan, Chair Andrew McCallum, Member Erik Learned-Miller, Member Weibo Gong, Member Andrew G. Barto, Department Chair Department of Computer Science #12;ACKNOWLEDGMENTS I would like appreciative of the support offered by my other thesis committee members, Andrew McCallum, Erik Learned-Miller
ARF INVARIANTS AND THE GEOGRAPHY OF EVEN 4--MANIFOLDS
Bohr, Christian
BOHR eight. In [14], P. Teichner proved that every combination of signature and fundamental group intersection form, signature n and fundamental group #5; if and only if n is a multiple of eight and H 1 (#5 form and prescribed fundamental group. As an application, we prove several results on the geography
MA455 Manifolds Programme, Aims, Objectives, all rolled into one
Mond, David
famous theorems: Brouwer's fixed-point theorem (that every continuous map Bn Bn has a fixed-point, where, it would make a good preparation. I stongly recommend chapters 1 through 5 as bed-time reading during
MA455 Manifolds Programme, Aims, Objectives, all rolled into one
Mond, David
famous theorems: Brouwer's fixedpoint theorem (that every continuous map B n # B n has a fixed, it would make a good preparation. I stongly recommend chapters 1 through 5 as bedtime reading during
On the counting of holomorphic discs in toric Fano manifolds
Cheol-Hyun Cho
2014-03-18T23:59:59.000Z
Open Gromov-Witten invariants in general are not well-defined. We discuss in detail the enumerative numbers of the Clifford torus $T^2$ in $\\CP^2$. For cyclic A-infinity algebras, we show that certain generalized way of counting may be defined up to Hochschild or cyclic boundary elements. In particular we obtain a well-defined function on Hochschild or cyclic homology of a cyclic A-infinity algebra, which has invariance property under cyclic A-infinity homomorphism. We discuss an example of Clifford torus $T^2$ and compute the invariant for a specific cyclic cohomology class.
Skew-product decompositions of Brownian motions on manifolds: A ...
2002-07-25T23:59:59.000Z
(1) If (M,g) is an euclidean sphere, i.e. the sectional curvature K is constant and non- ..... 27,. 139–142. [6] A.R. Galmarino, Representation of an isotropic diffusion as a ... [19] H.S. Ruse, A.G. Walker, T.J. Willlmore, Harmonic Spaces, Edizioni ...
Geometrical classification of Killing tensors on bidimensional flat manifolds
C. Chanu; L. Degiovanni; R. G. McLenaghan
2006-08-31T23:59:59.000Z
Valence two Killing tensors in the Euclidean and Minkowski planes are classified under the action of the group which preserves the type of the corresponding Killing web. The classification is based on an analysis of the system of determining partial differential equations for the group invariants and is entirely algebraic. The approach allows to classify both characteristic and non characteristic Killing tensors.
Quantized Nambu-Poisson manifolds and n-Lie algebras
DeBellis, Joshua; Saemann, Christian; Szabo, Richard J. [Department of Mathematics, Heriot-Watt University, Colin Maclaurin Building, Riccarton, Edinburgh EH14 4AS (United Kingdom) and Maxwell Institute for Mathematical Sciences, Edinburgh (United Kingdom)
2010-12-15T23:59:59.000Z
We investigate the geometric interpretation of quantized Nambu-Poisson structures in terms of noncommutative geometries. We describe an extension of the usual axioms of quantization in which classical Nambu-Poisson structures are translated to n-Lie algebras at quantum level. We demonstrate that this generalized procedure matches an extension of Berezin-Toeplitz quantization yielding quantized spheres, hyperboloids, and superspheres. The extended Berezin quantization of spheres is closely related to a deformation quantization of n-Lie algebras as well as the approach based on harmonic analysis. We find an interpretation of Nambu-Heisenberg n-Lie algebras in terms of foliations of R{sup n} by fuzzy spheres, fuzzy hyperboloids, and noncommutative hyperplanes. Some applications to the quantum geometry of branes in M-theory are also briefly discussed.
Extention cohomological fields theories and noncommutative Frobenius manifolds
S. M. Natanzon
2005-10-04T23:59:59.000Z
We construct some extension ({\\it Stable Field Theory}) of Cohomological Field Theory. The Stable Field Theory is a system of homomorphisms to some vector spaces generated by spheres and disks with punctures. It is described by a formal tensor series, satisfying to some system of "differential equations". In points of convergence the tensor series generate special noncommutative analogues of Frobenius algebras, describing 'Open-Closed' Topological Field Theories.
Extreme Elevation on a 2-Manifold Pankaj K. Agarwal
Edelsbrunner, Herbert
is clearly important and the interest in protein docking is correspondingly wide-spread. We refer to survey by NSF under grants EIA-99- 72879, EIA-01-31905, CCR-00-86013, CCR-02-04118, DMS-01-07621, and by the U
Global expenditure on subsea manifolds is estimated to reach...
investment in research and development activities increases and manufacturers vie to win contracts from companies that have strong, established positions in hydrocarbon...
From manifolds to invariants of En?-algebras
Andrade, Ricardo (Ricardo Joel Abrantes Andrade)
2010-01-01T23:59:59.000Z
This thesis is the first step in an investigation of an interesting class of invariants of En-algebras which generalize topological Hochschild homology. The main goal of this thesis is to simply give a definition of those ...
Three-dimensional routed manifolds with externally inserted cables
Breinlinger, Keith J. (Keith Joseph), 1974-
2003-01-01T23:59:59.000Z
The Automatic Test Equipment industry must maintain a tester accuracy of roughly one tenth the pulsewidth of the device under test (DUT). Funneling a vast number of electrical signals into a very tiny area to contact the ...
the tensor product in the theory of frobenius manifolds
Remark 1.1.4. Using Yn one .... The diagonal of Hon >< 11—4-0“. Denote the ..... I a dill/9212195111)”, + Z: dgl2cllgirglggnajn + Z Gig/2195219211111 cl cl! cl.
From the Boltzmann equation to fluid mechanics on a manifold
Peter J. Love; Donato Cianci
2012-08-27T23:59:59.000Z
We apply the Chapman-Enskog procedure to derive hydrodynamic equations on an arbitrary surface from the Boltzmann equation on the surface.
Lagrangian Mechanics on the standard Cliffordian Kaehler Manifolds
Mehmet Tekkoyun
2009-02-21T23:59:59.000Z
This study presents standard Cliffordian Kaehler analogue of Lagrangian mechanics. Also, the some geometric and physical results related to the standard Cliffordian Kaehler dynamical systems are given.
Manifolds and Transformation Groups WS 05 --Technische Universitat Darmstadt
Sanderson, Yasmine
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 III.2. The exterior product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 III.3. Orientations on vector space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 IV.3. The exterior differential
THE MANIFOLD STRUCTURE OF G/H PATRICK EBERLEIN
Eberlein, Patrick
)) contains H and hence also P H = G = TeG. It follows that : T(0,0)(P x H) TeG is an isomorphism since dim
Invariant manifolds for a singular ordinary differential equation Stefano Bianchini
Spinolo, Laura Valentina
, Scuola Normale Superiore, Pisa, Italy and Institute of Mathemathics, University of Zurich, Switzerland
Fano manifolds whose elementary contractions are smooth -fibrations
Occhetta, Gianluca
partially supported by the Spanish government grant MTM2009-06964, and by the National Re- searcher Program 2010-0020413 of NRF.. Second author partially supported by the Spanish government grant MTM2009
Large-Scale Methods for Nonlinear Manifold Learning
Vladymyrov, Maksym
2014-01-01T23:59:59.000Z
search directions, optimization techniques and N -body methods with specific NLEsearch directions, opti- mization techniques and N -body methods with specific NLE
Homotopic Path Planning on Manifolds for Cabled Mobile Robots
Igarashi, Takeo
and power. Currently, cables are a viable option for robots that work in fixed environments such as homes are experimentally validated using a real robot. 1 Introduction Mobile robots are typically untethered. This is not always desirable in household and high-power robotics. Wireless communication can be unreliable
Fournier, John J.F.
the definition shortly. These notes are intended to provide a lightning fast introduction to integration . Definition M.1 Let n 1 be an integer. (a) Let a IRn and > 0. The open ball of radius centred on a is B is open if and only if it is a union of open balls. (c) Fix any W IRn . A subset V W is said
Wong, Benjamin L.
2009-01-01T23:59:59.000Z
of a subchondral bone perforation on the load supportPerforations . 203subchondral bone plate perforation. Trans Orthop Res Soc 31:
A Retrospective Analysis of Emergency Department Ultrasound for Acute Appendicitis
Fox, John C; Hunt, Matthew J; Zlidenny, Alex M; Oshita, Masaru H; Barajas, Graciela; Langdorf, Mark I
2007-01-01T23:59:59.000Z
main factor leading to perforation. Imaging outside the EDappendicitis leading to perforation is the leading cause ofsubmucosa (indicating perforation). 13,21 Conversely, an
Outcomes and costs of surgical treatments of necrotizing enterocolitis
2015-01-01T23:59:59.000Z
with neonatal bowel perforation: a single-center experienceO, et al. Gastrointestinal perforations in neonatal period:under local anesthesia for perforations from necrotizing
Douglas, David
2010-01-01T23:59:59.000Z
walled-off small-bowel perforation and pseudocyst formation.by antenatal bowel perforation with spillage of meconiumof bowel obstruction and perforation include meconium ileus,
Delayed Presentation of Sigmoid Volvulus in a Young Woman
Weingrow, Daniel; McCague, Andrew; Shah, Ravi; Lalezarzadeh, Fariborz
2012-01-01T23:59:59.000Z
examination. 5 Gangrene and perforation are commonly earlyincludes risk of perforation. Expectant management is nothigh risk for gangrene or perforation. When gangrenous bowel
In the Soup: Caustic Ingestion from the Improper Consumption of a Self-Heating Soup
Hanson, Matthew; Hafner, John William
2012-01-01T23:59:59.000Z
caustic, stricture, perforation)? Curr Opin Gastroenterol.no evidence of esophageal perforation or abnormality. Theto have no esophageal perforation and no transmural or deep
Daley, T.M.
2011-01-01T23:59:59.000Z
sand and above the perforations, as shown in Figure 4.2 plume along with well perforation and packer locations. (plume along with well perforation and packer locations. (
The Handbook for Rapid Interpretation of the Audiogram
Colombo, Beth; Squires, Lane
2015-01-01T23:59:59.000Z
be associated with TM perforation or a mass in the middlehypermobility or, less frequently, a healing TM perforation.Normal OME, perforation, mass ETD OC fixation OC
An interactive teaching device simulating intussusception reduction
2010-01-01T23:59:59.000Z
A, Alton DJ, Ein S et al (1995) Perforation during attemptedin children—a comparison of perforation with barium and air.process, including perforation. This intussusception reduc-
2009-01-01T23:59:59.000Z
2007) Radiofrequency perforation of the right ventricularused to align the RF perforation catheter in the appropriateconnections; however, perforation from the SVC to the right
2013-01-01T23:59:59.000Z
Y, Abdullah F: Risk of perforation increases with delay inof the abdominal cavity (perforation of duodenal ulcer,rated diverticulitis) or perforation of an inflamed organ (
Approaches to Modeling Coupled Flow and Reaction in a 2-D Cementation Experiment
Cochepin, B.
2008-01-01T23:59:59.000Z
precipitation and perforation of a clogging obstacle madethan in Crunch. The perforation of the calcium oxalate wallevolve. First, the wall perforation occurs after ~50 days
Small Bowel Obstruction from Capsule Endoscopy
Boysen, Megan M; Ritter, Mike
2010-01-01T23:59:59.000Z
small bowel obstruction or perforation. 8-12 Volume XI, no .Small bowel obstruction and perforation are rare but seriousbowel obstruction or perforation. Diagnosis may be aided by
Analysis of Senate Bill 1508: Use of Propofol for Colonscopies
California Health Benefits Review Program (CHBRP)
2006-01-01T23:59:59.000Z
and potential risk for perforation of the colon. All threeMeSH Terms] “intestinal perforation”[MeSH Terms] “colonicAirway obstruction Intestinal perforation Prognosis Prognos*
2013 WSES guidelines for management of intra-abdominal infections
2013-01-01T23:59:59.000Z
J, Buhr HJ, Ritz JP: Perforation risk and patient age. [Riskpatients with colorectal perforation after colonoscopy. Amof colon endoscopic perforations. Acta Chir Belg 1993, 93(
Wessling, S.
2009-01-01T23:59:59.000Z
to the wellbore by perforation. Fig. 2 also shows twothe wellbore by casing perforations between 3787 and 3791 mthrough the 4-m long perforation zone now starts spreading
Borehole Seismic Monitoring at Otway Using the Naylor-1 Instrument String
Daley, T.M.
2010-01-01T23:59:59.000Z
was obtained when five perforation shots were performed in1. The timing between perforation and recording system wasperiod of the CRC-1 perforation shots. The second through
The Back Alley Revisited: Sepsis after Attempted Self-Induced Abortion
Saultes, Teresa A; Devita, Diane; Heiner, Jason D
2009-01-01T23:59:59.000Z
objects increases the risk of perforation, and intrauterineair from uterine perforation. Because the majority ofis suspicion of uterine perforation, bowel injury, abscess
Viability of dynamic cooling control in a data center environment
Boucher, T.; Auslander, D.; Bash, C.; Federspiel, C.; Patel, C.
2006-01-01T23:59:59.000Z
Center: Effect of Perforated Tile Flow Distribution on Rackthe Design of Perforated Tiles in Raised Floor Data CentersDistribution through Perforated Tiles in Raised Floor Data
Paris-Sud XI, Université de
compared collector data with radial spreading data issued from a radial heat transfer model. Although
Appelfeld, David
2013-01-01T23:59:59.000Z
energy consumption is strongly influenced by the solar gainsSolar shading is an effective strategy to reduce overheating and diffuse direct sunlight thus reducing energy consumption [
PAPER www.rsc.org/loc | Lab on a Chip Perforated membrane method for fabricating three-dimensional
Zare, Richard N.
channel or valve arrays that can pass over and under one another. Devices containing as many as two slabs and a second 2D layer, if present, is for pressure-actuated valves and pumps. As Whitesides and coworkers first
The Genetic Basis of Crohn's Disease
Brutlag, Doug
obstruction Fistulas Anemia Perforation "Flare-ups" followed by periods of being healthy Perforating vs. Non-perforating Abcesses/free perforation vs. blockage/bleeding #12;Diagnosis Physical examination
Cecal Volvulus in Adolescence Presenting as Recurring Visits for Abdominal Pain
Browne, Nicole
2010-01-01T23:59:59.000Z
of cecal necrosis or perforation. 2 In the absence ofThe risk of bowel ischemia, perforation and sepsis increases
2015-01-01T23:59:59.000Z
of penetration and perforation. Int. J. Eng. Sci. 16, 793–absorbed during ballistic perforation of composite armours.
Salinity driven oceanographic upwelling
Johnson, David H. (Lakewood, CO)
1986-01-01T23:59:59.000Z
The salinity driven oceanographic upwelling is maintained in a mariculture device that includes a long main duct in the general shape of a cylinder having perforated cover plates at each end. The mariculture device is suspended vertically in the ocean such that one end of the main duct is in surface water and the other end in relatively deep water that is cold, nutrient rich and relatively fresh in comparison to the surface water which is relatively warm, relatively nutrient deficient and relatively saline. A plurality of elongated flow segregating tubes are disposed in the main duct and extend from the upper cover plate beyond the lower cover plate into a lower manifold plate. The lower manifold plate is spaced from the lower cover plate to define a deep water fluid flow path to the interior space of the main duct. Spacer tubes extend from the upper cover plate and communicate with the interior space of the main duct. The spacer tubes are received in an upper manifold plate spaced from the upper cover plate to define a surface water fluid flow path into the flow segregating tubes. A surface water-deep water counterflow is thus established with deep water flowing upwardly through the main duct interior for discharge beyond the upper manifold plate while surface water flows downwardly through the flow segregating tubes for discharge below the lower manifold plate. During such counterflow heat is transferred from the downflowing warm water to the upflowing cold water. The flow is maintained by the difference in density between the deep water and the surface water due to their differences in salinity. The upwelling of nutrient rich deep water is used for marifarming by fertilizing the nutrient deficient surface water.
Salinity driven oceanographic upwelling
Johnson, D.H.
1984-08-30T23:59:59.000Z
The salinity driven oceanographic upwelling is maintained in a mariculture device that includes a long main duct in the general shape of a cylinder having perforated cover plates at each end. The mariculture device is suspended vertically in the ocean such that one end of the main duct is in surface water and the other end in relatively deep water that is cold, nutrient rich and relatively fresh in comparison to the surface water which is relatively warm, relatively nutrient deficient and relatively saline. A plurality of elongated flow segregating tubes are disposed in the main duct and extend from the upper cover plate beyond the lower cover plate into a lower manifold plate. The lower manifold plate is spaced from the lower cover plate to define a deep water fluid flow path to the interior space of the main duct. Spacer tubes extend from the upper cover plate and communicate with the interior space of the main duct. The spacer tubes are received in an upper manifold plate spaced from the upper cover plate to define a surface water fluid flow path into the flow segregating tubes. A surface water-deep water counterflow is thus established with deep water flowing upwardly through the main duct interior for discharge beyond the upper manifold plate while surface water flows downwardly through the flow segregating tubes for discharge below the lower manifold plate. During such counterflow heat is transferred from the downflowing warm water to the upflowing cold water. The flow is maintained by the difference in density between the deep water and the surface water due to their differences in salinity. The upwelling of nutrient rich deep water is used for marifarming by fertilizing the nutrient deficient surface water. 1 fig.
Pylon-Based Jet Noise Suppressors Dimitri Papamoschou
Papamoschou, Dimitri
of coarse perforation, and porous flaps made of fine perforation. It is shown that all the deflectors reduce the perforations themselves can be shifted to very high frequency (rapidly attenuated by atmospheric absorption) by reducing the size of the perforation. Accordingly, the fine-perforation flaps provided superior acoustic
Finite Element Analyses of a Cyclically Loaded Linear Viscoelastic Biodegradable Stent
Murphy, Jason Kyle
2014-12-03T23:59:59.000Z
degradation behaviors on the performance of cylindrical annuli that mimic stents under cyclic loadings is examined. Two polymers are considered: poly-L-lactic acid (PLLA) and polyoxymethylene (POM). A numerical algorithm for an isotropic, linear, viscoelastic...
The prediction of low quality boiling voids
Griffith, P.
1963-01-01T23:59:59.000Z
Slug flow theory is used to predict the density in heated channels of various shapes. In order to make this calculation possible, measurements are made of the bubble rise velocity in annuli, tube bundles, and channels. It ...
Modeling and applications of two-phase flow distribution in manifolds under microgravity conditions
Young, Cale Hollis
1998-01-01T23:59:59.000Z
calculations for fluids and geometries of interest were performed in order to evaluate the performance of the code and design an experiment for code validation. Only one applicable microgravity two-phase flow experiment exists in the literature, and its results...
Bibliographie [1] R. Abraham, J.E. Marsden, T. Ratiu (1988). Manifolds, Tensors Analysis, and Appli-
1988-01-01T23:59:59.000Z
Cones and Functions in Optimization and Variational Inequalitites. Springer Monographs in Mathematics method for variational inequalitites. Computational Optimization and Applications, 12, 31Â40. [24] J.B.
Bibliographie [1] R. Abraham, J.E. Marsden, T. Ratiu (1988). Manifolds, Tensors Analysis, and Appli
1988-01-01T23:59:59.000Z
Inequalitites. Springer Monographs in Mathematics. Springer, New York. [23] A. Auslender, M. Teboulle, S. BenTiba (1999). A logarithmicquadratic proximal method for variational inequalitites. Computational
An index theorem for families of Dirac operators on odddimensional manifolds with boundary
Melrose, Richard
. The derivation of the index formula is effected by the combination of the superconnection formalism of Quillen
Exploring the Manifold of Seismic Waves: Application to the Estimation of Arrival-Times
Kye M. Taylor; Michael J. Procopio; Christopher J. Young; Francois G. Meyer
2010-07-22T23:59:59.000Z
We propose a new method to analyze seismic time series and estimate the arrival-times of seismic waves. Our approach combines two ingredients: the times series are first lifted into a high-dimensional space using time-delay embedding; the resulting phase space is then parametrized using a nonlinear method based on the eigenvectors of the graph Laplacian. We validate our approach using a dataset of seismic events that occurred in Idaho, Montana, Wyoming, and Utah, between 2005 and 2006. Our approach outperforms methods based on singular-spectrum analysis, waveleta nalysis, and STA/LTA.
Exploring the Manifold of Seismic Waves: Application to the Estimation of Arrival-Times
Taylor, K M; Young, C J; Meyer, F G
2010-01-01T23:59:59.000Z
We propose a new method to analyze seismic time series and estimate the arrival-times of seismic waves. Our approach combines two ingredients: the times series are first lifted into a high-dimensional space using time-delay embedding; the resulting phase space is then parametrized using a nonlinear method based on the eigenvectors of the graph Laplacian. We validate our approach using a dataset of seismic events that occurred in Idaho, Montana, Wyoming, and Utah, between 2005 and 2006. Our approach outperforms methods based on singular-spectrum analysis, waveleta nalysis, and STA/LTA.
Minnesota, University of
; and general geometric mapping between high dimensional surfaces. £ Instituto de Ingenieria Electrica
Manifold Methods for Energetic Materials Joseph M. Powers and Samuel Paolucci
critical in reactive fluid mechanics: Candle flames, Atmospheric chemistry, Internal combustion engines, Gas phase reactions in energetic solid combustion. · Common detailed kinetic models of Aerospace and Mechanical Engineering University of Notre Dame presented at the IMA Workshop on High
, Atmospheric chemistry, Internal combustion engines, Gas phase reactions in energetic solid combustion Kinetics, 2. Combustion of HMX or RDX Product Gases. by Joseph M. Powers Department of Aerospace and Mechanical Engineering University of Notre Dame presented at the 1999 Explosives Research Program Review Los
Loops in Reeb Graphs of 2-Manifolds Kree Cole-McLaughlin
Pascucci, Valerio
-resolution versions of the Reeb graph have lead to data-base search methods for topologically similar geo- metric and scientific data. Specifically, we study Reeb graphs, which express the connectivity of level sets. These graphs have been used in the past to con- struct data structures and user-interfaces for modeling
Structure of Three-Manifolds Shing-Tung Yau1,2
;Canonical conformal structure on surfaces Theorem (Poincaré's Uniformization Theorem) Any closed two-dimensional space is conformal to another space with constant Gauss curvature. Spherical Euclidean Hyperbolic #12
Extreme Elevation on a 2-Manifold Pankaj K. Agarwal, Herbert Edelsbrunner, John Harer and Yusu Wang
Agarwal, Pankaj K.
grants EIA-99- 72879, EIA-01-31905, CCR-00-86013, CCR-02-04118, DMS-01-07621, and by the U is clearly important and the interest in protein docking is correspondingly wide-spread. We refer to survey
Value Function Approximation on Non-Linear Manifolds for Robot Motor Control
Sugiyama, Masashi; Hachiya, Hirotaka; Towell, Christopher; Vijayakumar, Sethu
The least squares approach works efficiently in value function approximation, given appropriate basis functions. Because of its smoothness, the Gaussian kernel is a popular and useful choice as a basis function. However, ...
MORSE THEORY FOR NORMAL GEODESICS IN SUB-RIEMANNIAN MANIFOLDS WITH CODIMENSION ONE DISTRIBUTIONS
Tausk, Daniel Victor
on M which is the orthogonal of a unit vector field Y on M* *. We do not make any sponsored by CNPq, Brazil (Processo n. 301410/* *95); the fourth author is spon- sored by FAPESP, S"ao Paulo, Brazil (Processo n. 98/12530-2). 1 #12
Five-dimensional vector-coupled supergravity on a manifold with boundary
McReynolds, Sean
2007-01-01T23:59:59.000Z
We consider the bosonic and fermionic symmetries of five-dimensional Maxwell- and Yang-Mills-Einstein supergravity theories on a spacetime with boundaries (isomorphic to M x S1/Z2). Due to the appearance of the "Chern-Simons" term, the classical action is not generally invariant under gauge and supersymmetries. Once bulk vector fields are allowed to propagate on the boundaries, there is an "inflow" governed by the rank-3 symmetric tensor that defines the five-dimensional theories. We discuss the requirements that invariance of the action imposes on new matter content and boundary conditions.
Five-dimensional vector-coupled supergravity on a manifold with boundary
Sean McReynolds
2007-05-16T23:59:59.000Z
We consider the bosonic and fermionic symmetries of five-dimensional Maxwell- and Yang-Mills-Einstein supergravity theories on a spacetime with boundaries (isomorphic to M x S1/Z2). Due to the appearance of the "Chern-Simons" term, the classical action is not generally invariant under gauge and supersymmetries. Once bulk vector fields are allowed to propagate on the boundaries, there is an "inflow" governed by the rank-3 symmetric tensor that defines the five-dimensional theories. We discuss the requirements that invariance of the action imposes on new matter content and boundary conditions.
A proof of Tsygan's formality conjecture for an arbitrary smooth manifold
Dolgushev, Vasiliy A
2005-01-01T23:59:59.000Z
Proofs of Tsygan's formality conjectures for chains would unlock important algebraic tools which might lead to new generalizations of the Atiyah-Patodi-Singer index theorem and the Riemann-Roch-Hirzebruch theorem. Despite ...
Thompson, Paul
Imaging Agatha D. Lee Natasha Lepore Franco Lepore Flamine Alary Caroline Brun Yiyu Chou Marina Barysheva Arthur W. Toga Paul M. Thompson 1 Problem Description [Introduce the problem assuming readers
Tin, Marie-Lyne Appoline
1992-01-01T23:59:59.000Z
&'ontroll& r nn&) '?i into &!I pinot P (z) f + P, (z) P (z) Y z P ) Y m-1 Qz (z) 1 Q (z) 1 Qa (z) Qm(z) Fo l. [. it&i&i &le? t t&loi Ii &I?, ?"ra?& of a fee&it&ack . @item in&it ???&g i fiaeil zoot&oil& i ilii(l iti lilt&'I cail f&1 iill P... A Thesis by MARIE-LYNE APPOLINE TIN Approved as to style and content by: S. P. Bhattacharyya (Chair of Committee) A. Datta. ('t'lend&er) L Howz (Member) . Parlos lr1eniher) A. Patton (Head of Department) December I'19'2 ABSTRACT...
Center Manifold Analysis of a PointVortex Model of Vortex Shedding with Control
Protas, Bartosz
of the point vortex FÂ¨oppl system with linear feedback control. The FÂ¨oppl system was used in an earlier system. Key words: point vortices, flow control, dynamical systems, wake flows PACS: 47.15.Hg, 47.27.Rc, 47.27.Vf 1 Introduction Integration of rigorous methods of Modern Control Theory with Computational
Three-dimensional numerical manifold method simulations for blocky rock analysis
Shentu, Longfei
2011-01-01T23:59:59.000Z
After decades of development, people realize that there are wider and more various applications of numerical modeling and analysis. However, current feasible software tools cannot satisfy engineering and commercial goals. ...
LECTURES ON INDICES AND RELATIVE INDICES ON CONTACT AND CR-MANIFOLDS
Noether in [30]. Let S1 be the unit circle in the complex plane. A function or distribution on the unit function on the unit disk if and only if its negative Fourier coefficients all vanish. Define the sub) - dim(coker A). If the index is non-
Accepted for publication in J. Fluid Mech. 1 Stable Manifolds and the Transition to
Cvitanovc', Predrag
that the threshold scaled as Re with = -1, when the laminar flow was disturbed by a single boxcar pulse of fluid of fluid. For different disturbances of the laminar flow, Peixinho and Mullin (2007) found and other shear flows appear intermediate between turbulent and laminar motions. We take a step towards
A robust algorithm for template curve estimation based on manifold embedding
Paris-Sud XI, UniversitÃ© de
, Facultad de Ciencias EconÃ³micas, Universidad de Antioquia, MedellÃn, Colombia. c Laboratoire GÃ©nomique et with other methods, with both simulated and real datasets, show that the algorithm works well and outperforms interest for statistical methodologies and algorithms to remove the phase variability and recover a single
N=(4,4) Vector Multiplets on Curved Two-Manifolds
Lawrence, Albion
2015-01-01T23:59:59.000Z
We study the necessary conditions for preserving N=(4,4) supersymmetry on curved 2d backgrounds, following the strategy of Dumitrescu, Festuccia, and Seiberg. We derive the transformation laws and invariant action for off-shell Abelian vector multiplets. An explicit solution of the supersymmetry conditions is found on the round two-sphere.
Genealogy of Nonperturbative Quantum-Invariants of 3-Manifolds: The Surgical Family
Thomas Kerler
1996-03-22T23:59:59.000Z
We study the relations between the invariants $\\tau_{RT}$, $\\tau_{HKR}$, and $\\tau_L$ of Reshetikhin-Turaev, Hennings-Kauffman-Radford, and Lyubashenko, respectively. In particular, we discuss explicitly how $\\tau_L$ specializes to $\\tau_{RT}$ for semisimple categories and to $\\tau_{HKR}$ for Tannakian categories. We give arguments for that $\\tau_L$ is the most general invariant that stems from an extended TQFT. We introduce a canonical, central element, {\\sf Q}, for a quasi-triangular Hopf algebra, $\\A$, that allows us to apply the Hennings algorithm directly, in order to compute $\\tau_{RT}$, which is originally obtained from the semisimple trace-subquotient of $\\A-mod$. Moreover, we generalize Hennings' rules to the context of cobordisms, in order to obtain a TQFT for connected surfaces compatible with $\\tau_{HKR}\\,$. As an application we show that, for lens spaces and $\\A=U_q(sl_2)\\,$, the ratio of $\\tau_{HKR}$ and $\\tau_{RT}$ is the order of the first homology group. In the course of this paper we also outline the topology and the algebra that enter invariance proofs, which contain no reference to 2-handle slides, but to other moves that are local. Finally, we give a list of open questions regarding cellular invariants, as defined by Turaev-Viro, Kuperberg, and others, their relations among each other, and their relations to the surgical invariants from above.
A proof of Price's Law on Schwarzschild black hole manifolds for all angular momenta
Roland Donninger; Wilhelm Schlag; Avy Soffer
2010-07-12T23:59:59.000Z
Price's Law states that linear perturbations of a Schwarzschild black hole fall off as $t^{-2\\ell-3}$ for $t \\to \\infty$ provided the initial data decay sufficiently fast at spatial infinity. Moreover, if the perturbations are initially static (i.e., their time derivative is zero), then the decay is predicted to be $t^{-2\\ell-4}$. We give a proof of $t^{-2\\ell-2}$ decay for general data in the form of weighted $L^1$ to $L^\\infty$ bounds for solutions of the Regge--Wheeler equation. For initially static perturbations we obtain $t^{-2\\ell-3}$. The proof is based on an integral representation of the solution which follows from self--adjoint spectral theory. We apply two different perturbative arguments in order to construct the corresponding spectral measure and the decay bounds are obtained by appropriate oscillatory integral estimates.
IEEE TRANSACTIONS ON POWER SYSTEMS, CHEN, DENG AND HUO. 1 Electricity Price Curve Modeling is demonstrated by numerical results using historical price data taken from the Eastern U.S. electric power participants is how well they can model the electricity price dynamics and realistically capture its
Computing dynamics of copper-based SMA via centre manifold reduction of 3D models q
Melnik, Roderick
of applications in such areas as aerospace engineering, medicine, manufacturing (in- cluding automotive industry is based on the authors' contribution to the European Conference on Computational Mechanics, Munich, 1999 mechanics, and applied mathematics communities [4±13]. This interest has two major
Mucocutaneous histoplasmosis in HIV with an atypical ecthyma like presentation
Mehta, Vandana; De, Abhishek; Balachandran, C; Monga, Puja
2009-01-01T23:59:59.000Z
showed a 1 x 1 cm palatal perforation. At this visit his HIValong with a palatal perforation (Figs. 4, 5, 6). Figure 5our patient also had palatal perforation and nasal cartilage
Pierce, Krystal Victoria Lords
2013-01-01T23:59:59.000Z
two-step formation, perforation, rope- drying, and massThe female skeleton had a perforation above the right eyeThe presence of a perforation above the right eye socket of
In situ measurement of the hydrulic diffusivity of the active Chelungpu Fault, Taiwan
Doan, Mai-Linh; Brodsky, Emily E.; Ma, Kuo-Fong; Kano, Yasuyuki
2006-01-01T23:59:59.000Z
indicate the top and bottom depths of the perforations.Perforation location is accurate to within 0.5 m. This12 ] Even before the perforation, hole A was artesian with a
Mukhopadhyay, S.
2013-01-01T23:59:59.000Z
the storage formation, the perforation thickness, and otheris the dimensionless r w r w perforation thickness. To solveassumed to be 0.1 m and the perforation thickness is assumed
Cultural Geography and Interregional Contacts in Prehistoric Liangshan (Southwest China)
Hein, Anke Marion
2013-01-01T23:59:59.000Z
such as grooves or perforation can be seen, the distinctionfew knives have only one perforation or none at all. The un-upper right-hand corner. This perforation combined with the
Wendler, Carlan; Shoenberger, Jan Marie; Mailhot, Thomas; Perera, Phillips
2012-01-01T23:59:59.000Z
et al. Atrial septal perforation from TIPS stent migration.4. Bala TM, Panda M. Cardiac perforation and tamponade: aBryant TJ, Barnard JJ. Cardiac perforation due to Wallstent
INDUCED SEISMICITY In-Situ Laboratories for Understanding
2680 2700 Proppant tag Microearthquake count Well Perforations P Compression Dilatation N S EW/liter) Perforation Interval C Perforation Interval E 0 50 100 150 200 250 300 350 400 Distance Along Strike (m) 0 50
Three-year efficacy and safety of a new 52-mg levonorgestrel-releasing intrauterine system
Creinin, Mitchell David
2015-01-01T23:59:59.000Z
cy associated with a perforation. The pregnancies in Year 2investigator. Uterine perforation was reported in 3 (0.17%)performed. The two ( 0.11%) perforations that occurred with
O'Masta, MR; Compton, BG; Gamble, EA; Zok, FW; Deshpande, VS; Wadley, HNG
2015-01-01T23:59:59.000Z
residual velocities after perforation are also shown. Fig.Plate bulging prior to perforation pre-accelerates the reara prism apex resulted in full perforation with a debris exit
13-Year-Old with Cryptic Abdominal Pain
Spring, Stephanie; Anderson, Richard; Carlson, Jestin N.
2015-01-01T23:59:59.000Z
of Emergency Medicine perforation in a child: a case report.including gastric perforation has been reported. 6,7 The
Probabilistically Accurate Program Transformations
Rinard, Martin
of loop perforation (which transforms loops to execute fewer iterations) to a set of computational the probabilistic guarantees for those bounds. 1.1 Loop Perforation In this paper, we focus on loop perforation demonstrate the util- ity and effectiveness of loop perforation in reducing the amount of time (and/or other
Publications of P. E. Jupp [1 ] Jupp, P.E. (1971) Links in manifolds. Topology 10, 219225.
Stone, J. V.
1971-01-01T23:59:59.000Z
1990, (L. Verstraelen and A. West, eds), 163173. World Scientific. [25 ] Jupp, P.E. (1992) Derivative
Zhou, Quanlin
, piping, and hydraulic fracturing) in embankment dams [810], for example. The unconfined flow subsurface in geotechnical and hydraulic engineering. The analysis of unconfined seepage is often used
Paolucci, and Sandeep Singh University of Notre Dame submitted to Work in Progress Poster Session 28th@chaos.ame.nd.edu Sandeep Singh Ph.D. Candidate Department of Aerospace and Mechanical Engineering University of Notre Dame
Yarema A. Prykarpatsky; Nikolai N. Bogolubov Jr; Anatoliy K. Prykarpatsky; Valeriy H. Samoylenko
2011-05-22T23:59:59.000Z
A gradient-holonomic approach for the Lax type integrability analysis of differentialdiscrete dynamical systems is devised. The asymptotical solutions to the related Lax equation are studied, the related gradient identity is stated. The integrability of a discrete nonlinear Schredinger type dynamical system is treated in detail.
Caumon, Guillaume
Submitted to 2003 ACM Symposium on Solid Modeling and Applications Constrained modifications of non submitted to the 8th ACM Symposium on Solid Modeling and Applications (June 2003). Web Page: http
generate massive amounts of high-dimensional image and video data. One way to cope with this data deluge to a veritable data deluge, fueling the need for efficient algorithms for processing and efficient proto- cols
Verleysen, Michel
, Universite´ catholique de Louvain, Av. Georges Lemaitre, 4, B-1348 Louvain-la-Neuve, Belgium b Machine-la-Neuve, Belgium a r t i c l e i n f o Available online 10 January 2009 Keywords: Nonlinear dimensionality mining and other industrial and research domains have more and more to deal with high- dimensional data
Mukamel, Shaul
2015-01-01T23:59:59.000Z
recipe [Nenov et al., Comput. Theor. Chem. 10401041, 295-303 (2014)]. A wise reduction of the level
Three-fold coverings and hyperelliptic manifolds: a three-dimensional version of a result of Accola
630090, Russia and **Universit`a degli Studi di Trieste Dipartimento di Scienze Matematiche 34100 Trieste when the first and the third authors were visiting Trieste in february and may 2000, and it was Marco
Invariant manifolds and the longtime asymptotics of the NavierStokes and vorticity equations on R 2
Gallay, Thierry
2 Thierry Gallay Universitâ??e de ParisÂSud Mathâ??ematiques Bâ??atiment 425 FÂ91405 Orsay France C
Journal of Statistical Physics, Vol. 74. Nos. 1/2, 1994 Energy-Level Statistics of Model Quantum
Bleher, Pavel
Journal of Statistical Physics, Vol. 74. Nos. 1/2, 1994 Energy-Level Statistics of Model Quantum limit of a distribution for annuli of finite area. KEY WORDS: Energy-level statistics; integrable Received June 17. 1993 We investigate the statistics of the number N(R, S) of lattice points, n EZ
3D printing rises to the occasion | ornl.gov
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
3D printing rises to the occasion ORNL group shows how it's done, one layer at a time A perforated metal box produced by an Arcam 3D printer. This detailed A perforated metal box...
David Einspigel Curriculum Vitae
Cerveny, Vlastislav
in the detectability of perforation shots and microseismic events in the surface monitoring: the attenuation effect, Napa, USA, poster. Einspigel, D. & Eisner, L. 2012 Detection of perforation shots in surface monitoring
Developing a tight gas sand advisor for completion and stimulation in tight gas reservoirs worldwide
Bogatchev, Kirill Y.
2009-05-15T23:59:59.000Z
while completing and stimulating TGS reservoirs. The modules include Perforation Selection and Proppant Selection. Based on input well/reservoir parameters these subroutines provide unambiguous recommendations concerning which perforation strategy(s...
Virtual Colonoscopy: An Alternative Approach to Examination of the Entire Colon
and sedation required), time consuming (hours), and carries a small risk of perforation and death (colonic perforation in one in 500 to 1000 cases and death in one in 2,000 to 5,000 cases [29]). It fails
Tests an me I Slash 19n on n JAMES L. MURPHY AND HARRY E. SCHIMKEl
and an electric ignition squib were inserted through a perforation just before place- ment. The charge could a perforation just before place- ment. The charge could then be ignited either electrically 0 r with a fusee
Design and control of a mobile light ballet platform
Sibblies, Joshua Vincent Prescott
2014-01-01T23:59:59.000Z
Light ballet is the merging of art and technology; halogen lamps mounted on a turntable are placed inside of an opaque, perforated box. Light escapes through the perforations and creates a display of lights on surrounding ...
Developing a tight gas sand advisor for completion and stimulation in tight gas reservoirs worldwide
Bogatchev, Kirill Y.
2009-05-15T23:59:59.000Z
while completing and stimulating TGS reservoirs. The modules include Perforation Selection and Proppant Selection. Based on input well/reservoir parameters these subroutines provide unambiguous recommendations concerning which perforation strategy...
JOURNAL DE PHYSIQUE Colloque C3, Supplbment au n09, Tome 49, septembre 1988
Paris-Sud XI, Université de
the present work examines the perforation of 2024-T351 aluminium alloy plates. Quasi-static tensile, four
Grether, D.
2012-01-01T23:59:59.000Z
Perfor- mance of Focusing Collectors," Solar Energy ResearchCollectors," Proceedings of the 1979 International Congress of the International Solar
IN MEMORIAM Donald Robert Kaplan
of plication in palm leaves, and deciphering the mechanism of perforation in Monstera leaves. A second major
Project Management Plan - Small Producers Program
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
model of Well 17450 (scale is depth)...64 Fig. 47 Drilling direction and perforation segments in Well 17450......
The effect of variable permeability on a two stage sand consolidation technique
Tobola, David Philip
1985-01-01T23:59:59.000Z
of the chamber. This simulates a perforation into a low permeability zone with a high permeability streak near the perforation. All testing was done at room temperature. The consolidated sand mass is studied to determine resin flow characteristics..., respectively (see Table 3). A similar system used 1. 0 gallons/perforation/minute and 0. 5 gallons/perforation/minute as the respective high and low injection rates (see Table 4). The reduced injection rates allowed the resin to consolidate the sand more...
Real-Time Evaluation of Stimulation and Diversion in Horizontal Wells
Tabatabaei Bafruei, Seyed Mohammad
2012-02-14T23:59:59.000Z
of the reactants and products .................................................... 59 Table 4.1 Inversion results for the first and second sets of perforation using MCMC method... ........................................................................................ 75 Table 4.2 Inversion results for the first set of perforation ....................................... 77 Table 4.3 Inversion results for the second set of perforation ................................... 77 Table 4.4 Inversion results...
Baker, Timothy S.
that accompany perforation of target membranes, and contributing directly to membrane penetration during cell kDa, 600 copies per virion), has been implicated in membrane perforation (reviewed in Chandran conformational changes in 1, which precede membrane perforation (Chandran et al., 2002, 2003; Odegard et al
NEST Manual of Operations APPENDIX B
Rau, Don C.
Enterocolitis (NEC) or Isolated Intestinal Perforation (IP): Outcomes at 18·22 Months Adjusted Age A Trial for ELBW Infants with Necrotizing Enterocolitis (NEC) or Isolated Intestinal Perforation (IP)". This study Enterocolitis (NEC) is a serious infection of the intestines. An Isolated Perforation (IP) is a hole in the wall
Scanlon, Thomas
= {z U | f (z) = 0}. Definition The structure CCM is the multisorted structure having a sort M Questions Basic model theory of CCM Â· CCM eliminates quantifiers. Thomas Scanlon University of California theorem Strongly minimal groups Higher rank groups Questions Basic model theory of CCM Â· CCM eliminates
I. Aharonovich; L. P. Horwitz
2006-03-31T23:59:59.000Z
Gauge fields associated with the manifestly covariant dynamics of particles in (3,1) spacetime are five-dimensional. We provide solutions of the classical 5D gauge field equations in both (4,1) and (3,2) flat spacetime metrics for the simple example of a uniformly moving point source. Green functions for the 5D field equations are obtained, which are consistent with the solutions for uniform motion obtained directly from the field equations with free asymptotic conditions.
Spatial and Seasonal Patterns in Speciated Fine Particle
Fischer, Emily V.
solenoid manifold to critical orifice and pump cyclone cartridge with 4 filter cassettes electronics manifold cartridge with 4 cassettes solenoid valve (4) hose from solenoid manifold to critical orifice
Choi, Suhyoung
Euclidean geometry Spherical geometry Manifolds with geometric structures: manifolds need some canonical canonical descriptions.. Manifolds with (real) projective structures Outline Survey: Classical geometries's philosphy) Spherical geometry: Greek astronomy, Gauss, Riemann Hyperbolic geometry: Bolyai, Lobachevsky
10/25 Ben McReynolds (Purdue). Arithmetic Manifolds: An Introduction with Topological Problems. Abstract: I will give an introduction to arithmetic manifolds;
Exit time distribution in spherically symmetric two-dimensional domains
Rupprecht, J -F; Grebenkov, D S; Voituriez, R
2014-01-01T23:59:59.000Z
The distribution of exit times is computed for a Brownian particle in spherically symmetric two- dimensional domains (disks, angular sectors, annuli) and in rectangles that contain an exit on their boundary. The governing partial differential equation of Helmholtz type with mixed Dirichlet- Neumann boundary conditions is solved analytically. We propose both an exact solution relying on a matrix inversion, and an approximate explicit solution. The approximate solution is shown to be exact for an exit of vanishing size and to be accurate even for large exits. For angular sectors, we also derive exact explicit formulas for the moments of the exit time. For annuli and rectangles, the approximate expression of the mean exit time is shown to be very accurate even for large exits. The analysis is also extended to biased diffusion. Since the Helmholtz equation with mixed boundary conditions is encountered in microfluidics, heat propagation, quantum billiards, and acoustics, the developed method can find numerous appl...
Enhancing Departments and Graduate Education in Geography
Foote, Kenneth; Solem, Michael
2009-01-01T23:59:59.000Z
., Blumhof, J., Chalkley, B., Gravestock, P., Honeybone, A., King, H. & and Thomas, N. (2002). A national discipline-based workshop for new lecturers in higher education. Active Learning In Higher Education, 3(2),128–44. Colker, R. & Day, R. (2003... ). The new academic generation: A profession in transformation. Baltimore: John Hopkins University Press. Gaudet, C., Annulis, H., & Carr, J. (2003). Building the geospatial workforce. URISA Journal, 15(1), 21-30. Gedye, S., Fender, E. & Chalkey, B...
Self-defrosting recuperative air-to-air heat exchanger
Drake, Richard L. (Delmar, NY)
1993-01-01T23:59:59.000Z
A heat exchanger includes a stationary spirally or concentrically wound heat exchanger core with rotating baffles on upper and lower ends thereof. The rotating baffles include rotating inlets and outlets which are in communication with respective fixed inlets and outlets via annuli. The rotation of the baffles causes a concurrent rotation of the temperature distribution within the stationary exchanger core, thereby preventing frost build-up in some applications and preventing the formation of hot spots in other applications.
Measurement of Hydrogen Purge Rates in Parabolic Trough Receiver Tubes: Preprint
Glatzmaier, G. C.
2010-10-01T23:59:59.000Z
The purpose of this research is to investigate and develop methods to remove hydrogen centrally from commercial parabolic trough power plants. A mathematical model was developed that tracks the generation and transport of hydrogen within an operating plant. Modeling results predicted the steady-state partial pressure of hydrogen within the receiver annuli to be ~1 torr. This result agrees with measured values for the hydrogen partial pressure. The model also predicted the rate at which hydrogen must be actively removed from the expansion tank to reduce the partial pressure of hydrogen within the receiver annuli to less than 0.001 torr. Based on these results, mitigation strategies implemented at operating parabolic trough power plants can reduce hydrogen partial pressure to acceptable levels. Transient modeling predicted the time required to reduce the hydrogen partial pressures within receiver annuli to acceptable levels. The times were estimated as a function of bellows temperature, getter quantity, and getter temperature. This work also includes an experimental effort that will determine the time required to purge hydrogen from a receiver annulus with no getter.
Diffeomorphism Algebra Structure and Membrane Theory
Jens Hoppe; Mariusz Hynek
2011-09-02T23:59:59.000Z
Explicit structure constants are calculated for certain Lie algebras of vectorfields on 2-dimensional compact manifolds.
GAFA, Geom. funct. anal. Vol. 8 (1998) 17 58
Piazza, Paolo
1998-01-01T23:59:59.000Z
of the heat kernel on manifolds with conical singularities [C] and Bismut's superconnection heat kernel proof
Scalable microreactors and methods for using same
Lawal, Adeniyi (Livingston, NJ); Qian, Dongying (Millburn, NJ)
2010-03-02T23:59:59.000Z
The present invention provides a scalable microreactor comprising a multilayered reaction block having alternating reaction plates and heat exchanger plates that have a plurality of microchannels; a multilaminated reactor input manifold, a collecting reactor output manifold, a heat exchange input manifold and a heat exchange output manifold. The present invention also provides methods of using the microreactor for multiphase chemical reactions.
Kouznetsov, Dmitrii
comparative situations: i) when the magnetic induction ~B0 = ^kB0 is the same in the central perforation and in the box, and ii) when its values in the perforation ~Bi = ^kBi and in the box ~B0 = ^kB0 are different in the perforation as Bi ¡ B0 changes. PACS. 03.65.w Quantum mechanics. PACS. 03.65.Bz Aharonov-Bohm effect. I
System-Level Monitoring and Diagnosis of Building HVAC System
Wu, Siyu
2013-01-01T23:59:59.000Z
Housing, energy and thermal comfort: A review of 10D. Liao, Evaluation on energy and thermal perfor- mance forsystematic evaluation on energy and thermal performance for
July | U.S. DOE Office of Science (SC)
Office of Science (SC) Website
Perforation, and Fragmentation By Randall Hand and Miguel Valenciano (DOD High Performance Computing Modernization Program Data Analysis and Assessment Center), Eric Fahrenthold...
&,Qcience Scrvice Feature Released on YeCoYpt
of telephone wircs 8s though they wero throads, the smashing of windows md t h e perforation of t i l e d roofs
fe0024293-geglobal | netl.doe.gov
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
sensitive aquifer depth region, as well as in the vicinity of lateral perforation zones, where accurate assessment of well integrity is of paramount importance to...
Current use of limited-entry hydraulic fracturing in the Codell/Niobrara Formations -- DJ Basin
Eberhard, M.J.; Schlosser, D.E.
1994-12-31T23:59:59.000Z
In the last several years, limited-entry perforating has been used for hydraulically fracturing the Codell and Niobrara formations in the Denver-Julesburg (DJ) Basin. Limited-entry perforating reduces stimulation costs with no apparent effect on production. Several papers have presented guidelines for designing a limited-entry treatment. A primary concern for treating multiple intervals is to ensure that both zones receive the necessary treatment. Currently, some operators simply ratio the number of perforations in each interval to the volume of treatment required for each interval. To ensure that both zones are being treated, a minimum pressure drop of 700 to 1,000 psi is usually used for limited-entry design. Changes in the perforation discharge coefficient and diameter during the treatment, combined with changes in the net treating pressure, affect the perforation pressure drop calculation. To determine the actual pressure drop across the perforations, designers use a real-time spreadsheet calculation. This paper reviews limited-entry treatments pumped in 34 wells that verify spreadsheet calculations. Changes in the perforation discharge coefficient and diameter will be presented, as well as the effect of proppant concentration and velocity through the perforation. The current spreadsheet calculation used on location to calculate the pressure drop across the perforations is also discussed.
Solar Ventilation Preheating Resources and Technologies | Department...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Ventilation Preheating Resources and Technologies Solar Ventilation Preheating Resources and Technologies Photo of a dark brown perforated metal wall is pictured on the side of an...
Static Temperature Survey At Long Valley Caldera Geothermal Area...
and 68-28 were perforated to allow sampling of formation watersgases and establish hydraulic connectivity between the wellbores and the surrounding rocks. The casing in wells...
Boyer, Edmond
measurements have been perfor- med on magnetic semiconductors MnxCd xTe mixed c r y s t a l s , i n t h e
Quality colonoscopy: A matter of time, technique or technology?
Lee, Robert H
2013-01-01T23:59:59.000Z
reserved. FIELD OF VISION Quality colonoscopy: A matter ofrate is a val- id quality measure for colonoscopy: resultspact of videorecording on the quality of colonoscopy perfor-
Al-Majed, Abdulaziz Abdullah
Engineers. Electronic reproduction, distribution, or storage of any part of this paper for commercial, anisotropy ratio, skin, tubing diameter and perforation distribution on the inflow performance
Power module assemblies with staggered coolant channels
Herron, Nicholas Hayden; Mann, Brooks S; Korich, Mark D
2013-07-16T23:59:59.000Z
A manifold is provided for supporting a power module assembly with a plurality of power modules. The manifold includes a first manifold section. The first face of the first manifold section is configured to receive the first power module, and the second face of the first manifold section defines a first cavity with a first baseplate thermally coupled to the first power module. The first face of the second manifold section is configured to receive the second power module, and the second face of the second manifold section defines a second cavity with a second baseplate thermally coupled to the second power module. The second face of the first manifold section and the second face of the second manifold section are coupled together such that the first cavity and the second cavity form a coolant channel. The first cavity is at least partially staggered with respect to second cavity.
EDGE TESSELLATIONS AND THE STAMP FOLDING MATTHEW KIRBY AND RON UMBLE
Umble, Ron
." How many ways can one con...gure the perforation lines on a sheet of postage stamps so that it folds that perforation lines in a sheet of postage stamps that folds into a stack of single stamps are lines of symmetry
COM224 -TD 5 Codes convolutifs
Rioul, Olivier
un des 4 bits de sortie. Cette opÃ©ration s'appelle une perforation. On rÃ©alise ainsi un code de taux 2 3 . Il existe 4 possibilitÃ©s de perforation , donc 4 codes. Calculer la distance libre de ces 4
X12A SAFETY CHECKLIST BROOKHAVEN NATIONAL LABORATORY NATIONAL SYNCHROTRON LIGHT SOURCE
Johnson, Peter D.
exclusion zone EZ1 (part 1) in place and secure. 5. Water is flowing through the beryllium window (check Bremsstrahlung shield in place and secure (acts as X12A exclusion zone) 7. Perforated aluminum exclusion zone EZ1 shield. 3. Bremsstrahlung shield BS1 in place and secure, as in photograph 4. Perforated aluminum
Curriculum Vit of SUBHASHIS GHOSHAL (variation: GHOSAL)
Ghoshal, Subhashis
of the American Statistical Association, 2010. 2. International Indian Statistical Association Young Researcher Statistical Institute Alumni Association Gold Medal for perfor- mance in the M. Stat. (1990). 8. Indian Statistical Institute Alumni Association Gold Medal for perfor- mance in the B. Stat. (1988). 2 #12;9. Prizes
Well completion process for formations with unconsolidated sands
Davies, David K. (Kingwood, TX); Mondragon, III, Julius J. (Redondo Beach, CA); Hara, Philip Scott (Monterey Park, CA)
2003-04-29T23:59:59.000Z
A method for consolidating sand around a well, involving injecting hot water or steam through well casing perforations in to create a cement-like area around the perforation of sufficient rigidity to prevent sand from flowing into and obstructing the well. The cement area has several wormholes that provide fluid passageways between the well and the formation, while still inhibiting sand inflow.
Alkassim, Ibrahim
2010-01-14T23:59:59.000Z
production of each vertical well vs. Barnett gross thickness (including Forestburg formation) plot. ...........................................44 3.15 EUR in month 480 vs. Barnett gross thickness (including Forestburg formation) plot... .....................................................................................................46 3.18 EUR in month 480 vs. perforation footage plot ..............................................47 3.19 Common Barnett perforated section ...............................................................48 3.20 EUR in month...
Energy Aware Consolidation for Cloud Computing Shekhar Srikantaiah
Zhao, Feng
resource usage, perfor- mance, and energy usages are not additive. Understand- ing the nature involved. We experimentally study how perfor- mance, energy usage, and resource utilization changes insights to infer optimal operating points that minimize energy usage with and without performance
Changala, P. Bryan, E-mail: bryan.changala@colorado.edu; Baraban, Joshua H.; Field, Robert W. [Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)] [Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Stanton, John F. [Department of Chemistry and Biochemistry, Institute for Theoretical Chemistry, The University of Texas at Austin, Austin, Texas 78712 (United States)] [Department of Chemistry and Biochemistry, Institute for Theoretical Chemistry, The University of Texas at Austin, Austin, Texas 78712 (United States); Merer, Anthony J. [Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan and Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1 (Canada)] [Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan and Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1 (Canada)
2014-01-14T23:59:59.000Z
Reduced dimension variational calculations have been performed for the rovibrational level structure of the S{sub 1} state of acetylene. The state exhibits an unusually complicated level structure, for various reasons. First, the potential energy surface has two accessible conformers, trans and cis. The cis conformer lies about 2700 cm{sup ?1} above the trans, and the barrier to cis-trans isomerization lies about 5000 cm{sup ?1} above the trans minimum. The trans vibrations ?{sub 4} (torsion) and ?{sub 6} (asym. bend) interact very strongly by Darling-Dennison and Coriolis resonances, such that their combination levels and overtones form polyads with unexpected structures. Both conformers exhibit very large x{sub 36} cross-anharmonicity since the pathway to isomerization is a combination of ?{sub 6} and ?{sub 3} (sym. bend). Near the isomerization barrier, the vibrational levels show an even-odd K-staggering of their rotational levels as a result of quantum mechanical tunneling through the barrier. The present calculations address all of these complications, and reproduce the observed K-structures of the bending and C–C stretching levels with good qualitative accuracy. It is expected that they will assist with the assignment of the irregular patterns near the isomerization barrier.
Mond, David
of dimension n. Find a diffeomorphism : G × TeG TG such that the diagram G × TeG // pr $$IIIIIIIIII TG p
Relativistic mechanics in a general setting
G. Sardanashvily
2010-05-07T23:59:59.000Z
Relativistic mechanics on an arbitrary manifold is formulated in the terms of jets of its one-dimensional submanifolds. A generic relativistic Lagrangian is constructed. Relativistic mechanics on a pseudo-Riemannian manifold is particularly considered.
Jet-controlled freeze valve for use in a glass melter
Routt, K.R.
1985-07-29T23:59:59.000Z
A drain valve for use in furnace for the melting of thermoplastic material is disclosed. The furnace includes a drain cavity formed in its bottom for withdrawing a flow of thermoplastic material. The drain valve includes a flow member which include a flow tube having an inlet and outlet for the material, and coaxially disposed concentric tubular members defining annuli surrounding the flow tube. The tubular members include heating and cooling means for the flow tube. The drain valve can also be used in a furnace of glass melting that includes a drain cavity for withdrawing molten glass from the furnace.
Self-defrosting recuperative air-to-air heat exchanger
Drake, R.L.
1993-12-28T23:59:59.000Z
A heat exchanger is described which includes a stationary spirally or concentrically wound heat exchanger core with rotating baffles on upper and lower ends thereof. The rotating baffles include rotating inlets and outlets which are in communication with respective fixed inlets and outlets via annuli. The rotation of the baffles causes a concurrent rotation of the temperature distribution within the stationary exchanger core, thereby preventing frost build-up in some applications and preventing the formation of hot spots in other applications. 3 figures.
Aspects of the life history of the silver seatrout, Cynoscion nothus, in the Gulf of Mexico
DeVries, Douglas A
1979-01-01T23:59:59.000Z
was developed. The mean back- calculated length at the first annulus was 156 mm SL. No fish had scales with two annuli and only 2. 6/ of 1483 fish aged had one annulus. Growth occurs throughout the year, but slows considerably during winter. Total annual...-LENGTH, GIRTH-LENGTH, AND STANDARD LENGTH-TOTAL LENGTH RELATIONSHIPS . . . . . . . . . . . . . . ~ 49 S UMMARY LITERATURE CITED 51 54 VITA 59 LIST OF FIGURES Figure Page Sizes of immature and female C. nothus in maturity stages 2 through 8. Maturity...
Serns, Steven Leo
1972-01-01T23:59:59.000Z
. S. , Texas A&M University Directed by: Dr. Kirk Strawn Bluegill collected in four heated reservoirs in Texas (Lake Bastrop, Lake Nasworthy, North Lake and Lake Colorado City) were aged by scale-reading. Back-calculated length frequency... in the heated strata than the non-heated strata. Annuli could not be discerned on the scales of bluegill confined to the heated discharge-canal at Lake Colorado City. There was an inverse relationship between both age of the reservoir and megawatts per...
Magnetic ripple correction in tandem mirrors by ferromagnetic inserts
Hamilton, G.W.
1985-04-04T23:59:59.000Z
Magnetic ripple of 1% or more caused by discrete solenoid coils in the central cells of tandem mirrors may severely affect the MHD stability. The ripple amplitude can be reduced by an order of magnitude by ferromagnetic annuli inserted within the coils at the regions of ripple maxima. The inserts need not affect the accessibility, coil diameter, or capital cost, since large quantities of steel are required within the coils for the neutron blanket and shield. Design of the ripple correction is simplified and linearized by the cylindrical geometry and by the saturation of the ferromagnetic steel.
Anderson, I.E.; Figliola, R.S.; Molnar, H.M.
1993-07-20T23:59:59.000Z
High pressure atomizing nozzle includes a high pressure gas manifold having a divergent expansion chamber between a gas inlet and arcuate manifold segment to minimize standing shock wave patterns in the manifold and thereby improve filling of the manifold with high pressure gas for improved melt atomization. The atomizing nozzle is especially useful in atomizing rare earth-transition metal alloys to form fine powder particles wherein a majority of the powder particles exhibit particle sizes having near-optimum magnetic properties.
Functional inequalities for subelliptic diffusion operators via ...
Fabrice Baudoin
2012-07-15T23:59:59.000Z
Apr 16, 2012 ... The curvature dimension inequality on Riemannian manifolds. In Riemannian geometry the Ricci tensor plays a fundamental role.
Optimization Online - Nonlinear Optimization Submissions - 2013
Nonlinear Optimization Submissions - 2013. January 2013. A Framework of Constraint Preserving Update Schemes for Optimization on Stiefel Manifold
Anti-rewet felt for use in a papermaking machine
Beck, David A.
2003-09-09T23:59:59.000Z
An anti-rewet fabric is used for carrying a fiber web through an air press. The anti-rewet fabric includes at least one air distribution fabric layer, one air distribution fabric layer being configured for contacting the fiber web, and a perforated film layer, the perforated film layer being made of a polyester film. The perforated film layer has a first film side and a second film side, the first film side being one of laminated and attached to the one air distribution fabric layer.
Apparatus and method for cooling a combustor cap
Zuo, Baifang; Washam, Roy Marshall; Wu, Chunyang
2014-04-29T23:59:59.000Z
A combustor includes an end cap having a perforated downstream plate and a combustion chamber downstream of the downstream plate. A plenum is in fluid communication with the downstream plate and supplies a cooling medium to the combustion chamber through the perforations in the downstream plate. A method for cooling a combustor includes flowing a cooling medium into a combustor end cap and impinging the cooling medium on a downstream plate in the combustor end cap. The method further includes flowing the cooling medium into a combustion chamber through perforations in the downstream plate.
Gradient zone-boundary control in salt-gradient solar ponds
Hull, J.R.
1982-09-29T23:59:59.000Z
A method and apparatus for suppressing zone boundary migration in a salt gradient solar pond includes extending perforated membranes across the pond at the boundaries, between the convective and non-convective zones, the perforations being small enough in size to prevent individual turbulence disturbances from penetrating the hole, but being large enough to allow easy molecular diffusion of salt thereby preventing the formation of convective zones in the gradient layer. The total area of the perforations is a sizeable fraction of the membrane area to allow sufficient salt diffusion while preventing turbulent entrainment into the gradient zone.
Gradient zone boundary control in salt gradient solar ponds
Hull, John R. (Downers Grove, IL)
1984-01-01T23:59:59.000Z
A method and apparatus for suppressing zone boundary migration in a salt gradient solar pond includes extending perforated membranes across the pond at the boundaries, between the convective and non-convective zones, the perforations being small enough in size to prevent individual turbulence disturbances from penetrating the hole, but being large enough to allow easy molecular diffusion of salt thereby preventing the formation of convective zones in the gradient layer. The total area of the perforations is a sizable fraction of the membrane area to allow sufficient salt diffusion while preventing turbulent entrainment into the gradient zone.
The massive star population in M101. II. Spatial variations in the recent star formation history
Grammer, Skyler; Humphreys, Roberta M., E-mail: grammer@astro.umn.edu, E-mail: roberta@umn.edu [Minnesota Institute for Astrophysics, 116 Church Street SE, University of Minnesota, Minneapolis, MN 55455 (United States)
2014-09-01T23:59:59.000Z
We investigate star formation history (SFH) as a function of radius in M101 using archival Hubble Space Telescope Advanced Camera for Surveys photometry. We derive the SFH from the resolved stellar populations in five 2' wide annuli. Binning the SFH into time frames corresponding to stellar populations traced by H?, far-ultraviolet, and near-ultraviolet emission, we find that the fraction of stellar populations young enough to contribute in H? is 15%-35% in the inner regions, compared to less than 5% in the outer regions. This provides a sufficient explanation for the lack of H? emission at large radii. We also model the blue to red supergiant ratio in our five annuli, examine the effects that a metallicity gradient and variable SFH have on the predicted ratios, and compare to the observed values. We find that the radial behavior of our modeled blue to red supergiant ratios is highly sensitive to both spatial variations in the SFH and metallicity. Incorporating the derived SFH into modeled ratios, we find that we are able to reproduce the observed values at large radii (low metallicity), but at small radii (high metallicity) the modeled and observed ratios are discrepant.
Fuel combustion exhibiting low NO{sub x} and CO levels
Keller, J.O.; Bramlette, T.T.; Barr, P.K.
1996-07-30T23:59:59.000Z
Method and apparatus are disclosed for safely combusting a fuel in such a manner that very low levels of NO{sub x} and CO are produced. The apparatus comprises an inlet line containing a fuel and an inlet line containing an oxidant. Coupled to the fuel line and to the oxidant line is a mixing means for thoroughly mixing the fuel and the oxidant without combusting them. Coupled to the mixing means is a means for injecting the mixed fuel and oxidant, in the form of a large-scale fluid dynamic structure, into a combustion region. Coupled to the combustion region is a means for producing a periodic flow field within the combustion region to mix the fuel and the oxidant with ambient gases in order to lower the temperature of combustion. The means for producing a periodic flow field can be a pulse combustor, a rotating band, or a rotating cylinder within an acoustic chamber positioned upstream or downstream of the region of combustion. The mixing means can be a one-way flapper valve; a rotating cylinder; a rotating band having slots that expose open ends of said fuel inlet line and said oxidant inlet line simultaneously; or a set of coaxial fuel annuli and oxidizer annuli. The means for producing a periodic flow field may or may not be in communication with an acoustic resonance. When employed, the acoustic resonance may be upstream or downstream of the region of combustion. 14 figs.
Microchannel heat sink assembly
Bonde, Wayne L. (Livermore, CA); Contolini, Robert J. (Pleasanton, CA)
1992-01-01T23:59:59.000Z
The present invention provides a microchannel heat sink with a thermal range from cryogenic temperatures to several hundred degrees centigrade. The heat sink can be used with a variety of fluids, such as cryogenic or corrosive fluids, and can be operated at a high pressure. The heat sink comprises a microchannel layer preferably formed of silicon, and a manifold layer preferably formed of glass. The manifold layer comprises an inlet groove and outlet groove which define an inlet manifold and an outlet manifold. The inlet manifold delivers coolant to the inlet section of the microchannels, and the outlet manifold receives coolant from the outlet section of the microchannels. In one embodiment, the manifold layer comprises an inlet hole extending through the manifold layer to the inlet manifold, and an outlet hole extending through the manifold layer to the outlet manifold. Coolant is supplied to the heat sink through a conduit assembly connected to the heat sink. A resilient seal, such as a gasket or an O-ring, is disposed between the conduit and the hole in the heat sink in order to provide a watetight seal. In other embodiments, the conduit assembly may comprise a metal tube which is connected to the heat sink by a soft solder. In still other embodiments, the heat sink may comprise inlet and outlet nipples. The present invention has application in supercomputers, integrated circuits and other electronic devices, and is suitable for cooling materials to superconducting temperatures.
Microchannel heat sink assembly
Bonde, W.L.; Contolini, R.J.
1992-03-24T23:59:59.000Z
The present invention provides a microchannel heat sink with a thermal range from cryogenic temperatures to several hundred degrees centigrade. The heat sink can be used with a variety of fluids, such as cryogenic or corrosive fluids, and can be operated at a high pressure. The heat sink comprises a microchannel layer preferably formed of silicon, and a manifold layer preferably formed of glass. The manifold layer comprises an inlet groove and outlet groove which define an inlet manifold and an outlet manifold. The inlet manifold delivers coolant to the inlet section of the microchannels, and the outlet manifold receives coolant from the outlet section of the microchannels. In one embodiment, the manifold layer comprises an inlet hole extending through the manifold layer to the inlet manifold, and an outlet hole extending through the manifold layer to the outlet manifold. Coolant is supplied to the heat sink through a conduit assembly connected to the heat sink. A resilient seal, such as a gasket or an O-ring, is disposed between the conduit and the hole in the heat sink in order to provide a watertight seal. In other embodiments, the conduit assembly may comprise a metal tube which is connected to the heat sink by a soft solder. In still other embodiments, the heat sink may comprise inlet and outlet nipples. The present invention has application in supercomputers, integrated circuits and other electronic devices, and is suitable for cooling materials to superconducting temperatures. 13 figs.
Körner, Wolfgang; Urban, Daniel F.; Ramo, David Muñoz; Bristowe, Paul D.; Elsässer, Christian
2014-11-21T23:59:59.000Z
through contract No. NMP3-LA- 2010-246334 (ORAMA). The calculations at Cambridge were performed using the High Performance Computing Facility, Darwin, and also the UK national high perfor- mance computing service ARCHER, for which access was obtained via...
Research Paper Abstract: Studies with seedlings of tropical rainforest trees (Ca-
Bermingham, Eldredge
photosynthetic perfor- mance and growth. Seedlings were cultivated in pots at a field site in Central Panama (98N) and separated into two groups: (1) plants exposed to full solar radiation; (2) plants subjected to automatic
Active negative-index metamaterial powered by an electron beam
Shapiro, Michael
An active negative index metamaterial that derives its gain from an electron beam is introduced. The metamaterial consists of a stack of equidistant parallel metal plates perforated by a periodic array of holes shaped as ...
Jet impingement heat transfer in two-pass rotating rectangular channels
Zhang, Yuming
1996-01-01T23:59:59.000Z
The combined effects of rotation and jet impingement on local heat transfer in a two-pass rotating rectangular channel is studied. The results of an experimental investigation on the surface heat transfer coefficients under a perforated plate...
Boyer, Edmond
of lucerne meal (12 %) as a partial protein supplementation led to good growth perfor- mances during without lucerne meal. In the case of diets containing 15 per cent protein and supplemented with lysine
Copyright 2001 Psychonomic Society, Inc. 272 Perception & Psychophysics
). The connection between visual search and mem- ory search has been empirically demonstrated by Hill- strom perfor- mance with a serial component for the last 30 years (e.g., Grossberg, Mingolla, & Ross, 1994; W
Intelligence University of Leeds, United Kingdom sckd@leeds.ac.uk Nizar Habash Center for Computational representation without pre- processing. We define an extended labelled attachment score (ELAS) as our perfor
Acoustic Behavior of Flow From Fracture To Wellbore
Chen, Kyle
2015-04-23T23:59:59.000Z
. The study is conducted on a laboratory setup that simulates the downhole condition when fluid flows from the fracture and perforation tunnel to the wellbore. To better simulate the downhole condition, a fracture cell and wellbore assembly are designed...
Implementing an integrated pest management (IPM) program in child care centers: A qualitative study
Kalmar, E; Ivey, SL; Bradman, A; Leonard, V; Alkon, A
2015-01-01T23:59:59.000Z
Care and Education Programs, Third Edition, and the U.S.edition of Caring for our Children, national health and safety perfor- mance standards for out-of-home child care programs,
Anode Materials DOI: 10.1002/anie.200804355
Cho, Jaephil
in High-Perfor- mance Lithium Secondary Batteries** Hyunjung Kim, Byunghee Han, Jaebum Choo, and Jaephil the capacity of graphite (ca. 372 mAhgÀ1 ),[1] which is currently used as an anode material. In spite
Energy Efficiency: The New Holy Grail of Data Management Systems Research
Liskov, Barbara
Energy Efficiency: The New Holy Grail of Data Management Systems Research Stavros Harizopoulos HP management systems community to shift focus from perfor- mance-oriented research to energy management systems, database systems, energy efficiency, power management. 1. INTRODUCTION Growing demands
An Active Measurement System for Shared Environments Joel Sommers
Barford, Paul
. Active measurement studies of Internet path properties that require precisely crafted probe streams canAn Active Measurement System for Shared Environments Joel Sommers Colgate University jsommers, Measurement, Perfor- mance Keywords: Active Measurement, Packet Scheduling, MAD 1. INTRODUCTION Several key
Chain Replication for Supporting High Throughput and Availability
Keinan, Alon
Chain Replication for Supporting High Throughput and Availability Robbert van Renesse rvr services that exhibit high throughput and availability with- out sacrificing strong consistency guarantees the perfor- mance characteristics of a prototype implementa- tion. Throughput, availability, and several
Paulraj, Rajkumar
1999-01-01T23:59:59.000Z
: //people. qualcomm. corn/kern/pile. txt [Accessed April 1999]. [27) Rathke, B. , Schlager, M. , Wolisz, A. , "Systematic Measurement of TCP Perfor- mance over Wireless LANs, " Technical Report TKN-01BR98, Telecommunica- tion Networks Group, Dept...
Hill, Wendell T.
pea seeds between the folds of a moistened paper towel and place inside a clear, perforated plastic- slice off young weeds at the soil line or use a thick mulch to prevent weeds. · Watering Keep the root
Mandal, Esan
2004-09-30T23:59:59.000Z
The goal of this thesis is to introduce new methods to create intricate perforated shapes in a computing environment. Modeling shapes with a large number of holes and handles, while requiring minimal human interaction, is ...