A Standard Reference Frame for the Description of Nucleic Acid Base-pair Geometry
Gerstein, Mark
uncertainties in this data set closely match numerical values reported in the recent survey of nucleic acid baseA Standard Reference Frame for the Description of Nucleic Acid Base-pair Geometry These preliminary (Rockefeller University), Richard E. Dickerson (University of California, Los Angeles), Mark Gerstein (Yale
Method for sequencing DNA base pairs
Sessler, Andrew M. (Oakland, CA); Dawson, John (Pacific Palisades, CA)
1993-01-01T23:59:59.000Z
The base pairs of a DNA structure are sequenced with the use of a scanning tunneling microscope (STM). The DNA structure is scanned by the STM probe tip, and, as it is being scanned, the DNA structure is separately subjected to a sequence of infrared radiation from four different sources, each source being selected to preferentially excite one of the four different bases in the DNA structure. Each particular base being scanned is subjected to such sequence of infrared radiation from the four different sources as that particular base is being scanned. The DNA structure as a whole is separately imaged for each subjection thereof to radiation from one only of each source.
Method for sequencing DNA base pairs
Sessler, A.M.; Dawson, J.
1993-12-14T23:59:59.000Z
The base pairs of a DNA structure are sequenced with the use of a scanning tunneling microscope (STM). The DNA structure is scanned by the STM probe tip, and, as it is being scanned, the DNA structure is separately subjected to a sequence of infrared radiation from four different sources, each source being selected to preferentially excite one of the four different bases in the DNA structure. Each particular base being scanned is subjected to such sequence of infrared radiation from the four different sources as that particular base is being scanned. The DNA structure as a whole is separately imaged for each subjection thereof to radiation from one only of each source. 6 figures.
Single-molecule derivation of salt dependent base-pair free energies in DNA
Ritort, Felix
Single-molecule derivation of salt dependent base-pair free energies in DNA Josep M. Hugueta measurements of base-pair free energies in DNA are obtained in thermal denaturation experiments, which depend on several as- sumptions. Here we report measurements of the DNA base-pair free energies based
Jin, Xiao
2013-11-21T23:59:59.000Z
inches diameter cores that varied in length. The lengths of the cores are 4 inches, 6 inches, and 8 inches long. The acid concentration used for these experiments was 15 wt% HCl. A pressure drop plot was created as the acid penetrates through the core...
Flexibility of short DNA helices with finite-length effect: from base pairs to tens of base pairs
Wu, Yuan-Yan; Zhang, Xi; Tan, Zhi-Jie
2015-01-01T23:59:59.000Z
Flexibility of short DNA helices is important for the biological functions such as nucleosome formation and DNA-protein recognition. Recent experiments suggest that short DNAs of tens of base pairs (bps) may have apparently higher flexibility than those of kilo bps, while there is still the debate on such high flexibility. In the present work, we have studied the flexibility of short DNAs with finite-length of 5 to 50 bps by the all-atomistic molecular dynamics simulations and Monte Carlo simulations with the worm-like chain model. Our microscopic analyses reveal that short DNAs have apparently high flexibility which is attributed to the significantly strong bending and stretching flexibilities of ~6 bps at each helix end. Correspondingly, the apparent persistence length lp of short DNAs increases gradually from ~29nm to ~45nm as DNA length increases from 10 to 50 bps, in accordance with the available experimental data. Our further analyses show that the short DNAs with excluding ~6 bps at each helix end have...
Swigon, David
DNA stretching modeled at the base pair level: Overtwisting and shear instability in elastic Accepted 28 October 2011 Available online 12 November 2011 Keywords: DNA mechanics Overstretching Discrete elastic model Simplex algorithm Bifurcations a b s t r a c t Stretching experiments on single DNA
Gilbert, Matthew
B-9 8DNA can be modeled as two parallel polymer strands with links between the strands called base a DNA molecule with N base pairs in thermal equilibrium at temperature T, as shown below. Thermal your expression separately in the limits that , and that . Next, consider the same DNA molecule now
Transformation Composition Transformational Geometry
Ferguson, Thomas S.
Isomotries Transformation Composition Congruence Transformational Geometry Christopher Ograin Christopher Ograin Transformational Geometry #12;Isomotries Transformation Composition Congruence Geo Transformational Geometry #12;Isomotries Transformation Composition Congruence Definitions Transformation
Nucleic Acids Research, 2009, 112 doi:10.1093/nar/gkp675
Hassibi, Arjang
Nucleic Acids Research, 2009, 112 doi:10.1093/nar/gkp675 Real-time DNA microarray analysis Arjang for the analysis of complex nucleic acid samples, use the base pairing of nucleic acid molecules (3) as both uncertainty associated with tar- get analyte capturing and detection, in all practical biosensors, binding
Marika Taylor
2005-07-22T23:59:59.000Z
Two charge BPS horizon free supergravity geometries are important in proposals for understanding black hole microstates. In this paper we construct a new class of geometries in the NS1-P system, corresponding to solitonic strings carrying fermionic as well as bosonic condensates. Such geometries are required to account for the full microscopic entropy of the NS1-P system. We then briefly discuss the properties of the corresponding geometries in the dual D1-D5 system.
Noncommutative geometry and physics
Jean Petitot
2015-05-01T23:59:59.000Z
This is a compilation of some well known propositions of Alain Connes concerning the use of noncommutative geometry in mathematical physics.
Geometry, noncommutative algebra and representations
Gordon, Iain
and Deformations 4 Representation Theory 2 Iain Gordon Geometry, noncommutative algebra and representations: analysis, algebra, geometry, number theory (to name four!) 4 Iain Gordon Geometry, noncommutative algebra is a finite field. 6 Iain Gordon Geometry, noncommutative algebra and representations Geometry and Commutative
Geometrie im Internet Wolfgang Rath
Havlicek, Hans
Geometrie im Internet Wolfgang Rath Institut für Geometrie, TU Wien rath@geometrie.tuwien.ac.at http://www.geometrie.tuwien.ac.at/rath Version 1999-11-15 #12;Geometrie im Internet - Wolfgang Rath......................................................................................... 5 1.1 SCHNELLER EINSTIEG INS INTERNET
Induced geometry from disformal transformation
Fang-Fang Yuan; Peng Huang
2015-02-08T23:59:59.000Z
In this note, we use the disformal transformation to induce a geometry from the manifold which is originally Riemannian. The new geometry obtained here can be considered as a generalization of Weyl integrable geometry. Based on these results, we further propose a geometry which is naturally a generalization of Weyl geometry.
Noncommutative Geometry and Physics
Connes, Alain [College de France, 3, rue d'Ulm, Paris, F-75005 France (France)
2006-11-03T23:59:59.000Z
In this very short essay we shall describe a 'spectral' point of view on geometry which allows to start taking into account the lessons from both renormalization and of general relativity. We shall first do that for renormalization and explain in rough outline the content of our recent collaborations with Dirk Kreimer and Matilde Marcolli leading to the universal Galois symmetry of renormalizable quantum field theories provided by the renormalization group in its cosmic Galois group incarnation. As far as general relativity is concerned, since the functional integral cannot be treated in the traditional perturbative manner, it relies heavily as a 'sum over geometries' on the chosen paradigm of geometric space. This will give us the occasion to discuss, in the light of noncommutative geometry, the issue of 'observables' in gravity and our joint work with Ali Chamseddine on the spectral action, with a first attempt to write down a functional integral on the space of noncommutative geometries.
The Geometry Of War The Geometry Of War
Aslaksen, Helmer
The Geometry Of War 1 #12;The Geometry Of War GEM1518K Mathematics in Arts &Architecture Presenting : The Geometry Of War Prepared by: 1) Linda Tjoe Matriculation number: U017984E 2) Lince Salim Matriculation017997 2 #12;The Geometry Of War Contents Page(s) Introduction 1 1.1 Early Canon 2 1.2 The Triumph
Rickard Jonsson; Hans Westman
2007-08-21T23:59:59.000Z
We show that by employing the standard projected curvature as a measure of spatial curvature, we can make a certain generalization of optical geometry (Abramowicz and Lasota 1997, Class. Quantum Grav. 14 (1997) A23). This generalization applies to any spacetime that admits a hypersurface orthogonal shearfree congruence of worldlines. This is a somewhat larger class of spacetimes than the conformally static spacetimes assumed in standard optical geometry. In the generalized optical geometry, which in the generic case is time dependent, photons move with unit speed along spatial geodesics and the sideways force experienced by a particle following a spatially straight line is independent of the velocity. Also gyroscopes moving along spatial geodesics do not precess (relative to the forward direction). Gyroscopes that follow a curved spatial trajectory precess according to a very simple law of three-rotation. We also present an inertial force formalism in coordinate representation for this generalization. Furthermore, we show that by employing a new sense of spatial curvature (Jonsson, Class. Quantum Grav. 23 (2006) 1) closely connected to Fermat's principle, we can make a more extensive generalization of optical geometry that applies to arbitrary spacetimes. In general this optical geometry will be time dependent, but still geodesic photons move with unit speed and follow lines that are spatially straight in the new sense. Also, the sideways experienced (comoving) force on a test particle following a line that is straight in the new sense will be independent of the velocity.
Integral Geometry and Holography
Czech, Bartlomiej; McCandlish, Samuel; Sully, James
2015-01-01T23:59:59.000Z
We present a mathematical framework which underlies the connection between information theory and the bulk spacetime in the AdS$_3$/CFT$_2$ correspondence. A key concept is kinematic space: an auxiliary Lorentzian geometry whose metric is defined in terms of conditional mutual informations and which organizes the entanglement pattern of a CFT state. When the field theory has a holographic dual obeying the Ryu-Takayanagi proposal, kinematic space has a direct geometric meaning: it is the space of bulk geodesics studied in integral geometry. Lengths of bulk curves are computed by kinematic volumes, giving a precise entropic interpretation of the length of any bulk curve. We explain how basic geometric concepts -- points, distances and angles -- are reflected in kinematic space, allowing one to reconstruct a large class of spatial bulk geometries from boundary entanglement entropies. In this way, kinematic space translates between information theoretic and geometric descriptions of a CFT state. As an example, we...
Sliding vane geometry turbines
Sun, Harold Huimin; Zhang, Jizhong; Hu, Liangjun; Hanna, Dave R
2014-12-30T23:59:59.000Z
Various systems and methods are described for a variable geometry turbine. In one example, a turbine nozzle comprises a central axis and a nozzle vane. The nozzle vane includes a stationary vane and a sliding vane. The sliding vane is positioned to slide in a direction substantially tangent to an inner circumference of the turbine nozzle and in contact with the stationary vane.
Cylindrical geometry hall thruster
Raitses, Yevgeny (Princeton, NJ); Fisch, Nathaniel J. (Princeton, NJ)
2002-01-01T23:59:59.000Z
An apparatus and method for thrusting plasma, utilizing a Hall thruster with a cylindrical geometry, wherein ions are accelerated in substantially the axial direction. The apparatus is suitable for operation at low power. It employs small size thruster components, including a ceramic channel, with the center pole piece of the conventional annular design thruster eliminated or greatly reduced. Efficient operation is accomplished through magnetic fields with a substantial radial component. The propellant gas is ionized at an optimal location in the thruster. A further improvement is accomplished by segmented electrodes, which produce localized voltage drops within the thruster at optimally prescribed locations. The apparatus differs from a conventional Hall thruster, which has an annular geometry, not well suited to scaling to small size, because the small size for an annular design has a great deal of surface area relative to the volume.
Sriram, M.; Yang, D.; Gao, Y.G. [Univ. of Illinois, Urbana, IL (United States)] [and others
1994-12-31T23:59:59.000Z
O6-ethyl-guanine (e{sup 6}G) is a relatively persistent alkylation lesion caused by the exposure of DNA to carcinogen N-ethyl-N-nitrosurea. We have studied the structural consequences of the e{sup 6}G incorporation in DNA by X-ray crystallography and NMR. We have obtained crystals of the modified DNA dodecamer d(CGC[e{sup 6}G]AATTCGCG) complexed to several minor groove binding drugs including Hoechst 33258, Hoechst 33342, netropsin, and SN6999. The space froup of the crystals from those complexes is P2{sub 1}2{sub 1}2{sub 1}. However, the crystal structure of the SN6999 complex is nor isomorphous to that from the other three complexes. In all four refined crystal structures, the drugs bind in the narrow minor groove at or clase to the central AATT region of the dodecamer B-DNA duplex. THe DNA conformation is influenced by the binding of drugs. The eight independent e{sup 6}G:C base pairs have a conformation ranging from one with three centered hydrogen bonds between the bases to a wobble conformation with two hydrogen bonds. The ethyl group of the eight e{sup 6}G bases is mostly in the proximal orientation to N7. Our 1D and 2D-NMR studies of the same (free) dodecamer reveal that the e{sup 6}G base pairs in the duplex are likely to adopt a wobble conformation in solution. Those results suggest that the e{sup 6}G base pair has a dynamic equilibrium among various conformations, which may present an ambiguous signal to cells. In contrast, the e{sup 6}G:T base pair adopts a Watson-Crick-like conformation. This may be a plausible explanation of why thymine is found preferentially incorporated across the e{sup 6}G during replication.
Integral Geometry and Holography
Bartlomiej Czech; Lampros Lamprou; Samuel McCandlish; James Sully
2015-05-20T23:59:59.000Z
We present a mathematical framework which underlies the connection between information theory and the bulk spacetime in the AdS$_3$/CFT$_2$ correspondence. A key concept is kinematic space: an auxiliary Lorentzian geometry whose metric is defined in terms of conditional mutual informations and which organizes the entanglement pattern of a CFT state. When the field theory has a holographic dual obeying the Ryu-Takayanagi proposal, kinematic space has a direct geometric meaning: it is the space of bulk geodesics studied in integral geometry. Lengths of bulk curves are computed by kinematic volumes, giving a precise entropic interpretation of the length of any bulk curve. We explain how basic geometric concepts -- points, distances and angles -- are reflected in kinematic space, allowing one to reconstruct a large class of spatial bulk geometries from boundary entanglement entropies. In this way, kinematic space translates between information theoretic and geometric descriptions of a CFT state. As an example, we discuss in detail the static slice of AdS$_3$ whose kinematic space is two-dimensional de Sitter space.
New developments in special geometry
Thomas Mohaupt
2006-02-17T23:59:59.000Z
We review recent developments in special geometry, emphasizing the role of real coordinates. In the first part we discuss the para-complex geometry of vector and hypermultiplets in rigid Euclidean N=2 supersymmetry. In the second part we study the variational principle governing the near horizon limit of BPS black holes in matter-coupled N=2 supergravity and observe that the black hole entropy is the Legendre transform of the Hesse potential encoding the geometry of the scalar fields.
Notes on basic algebraic geometry
2008-06-16T23:59:59.000Z
Jun 16, 2008 ... Notes on basic algebraic geometry ...... Having discovered the basic equation ..... back to a rational function on X. Thus we get a nonzero ...
Optical geometry across the horizon
Rickard Jonsson
2007-08-19T23:59:59.000Z
In a companion paper (Jonsson and Westman, Class. Quantum Grav. 23 (2006) 61), a generalization of optical geometry, assuming a non-shearing reference congruence, is discussed. Here we illustrate that this formalism can be applied to a finite four-volume of any spherically symmetric spacetime. In particular we apply the formalism, using a non-static reference congruence, to do optical geometry across the horizon of a static black hole. While the resulting geometry in principle is time dependent, we can choose the reference congruence in such a manner that an embedding of the geometry always looks the same. Relative to the embedded geometry the reference points are then moving. We discuss the motion of photons, inertial forces and gyroscope precession in this framework.
Quantum geometry and gravitational entropy
Simon, Joan; Balasubramanian, Vijay; Czech, Bart Iomiej; Larjo, Klaus; Marolf, Donald; Simon, Joan
2007-05-29T23:59:59.000Z
Most quantum states have wavefunctions that are widely spread over the accessible Hilbert space and hence do not have a good description in terms of a single classical geometry. In order to understand when geometric descriptions are possible, we exploit the AdS/CFT correspondence in the half-BPS sector of asymptotically AdS_5 x S5 universes. In this sector we devise a"coarse-grained metric operator" whose eigenstates are well described by a single spacetime topology and geometry. We show that such half-BPS universes have a non-vanishing entropy if and only if the metric is singular, and that the entropy arises from coarse-graining the geometry. Finally, we use our entropy formula to find the most entropic spacetimes with fixed asymptotic moments beyond the global charges.
Lighting and GeometryLighting and Geometry Prof. Michael Misha Kazhdan
Fröhlich, Peter
Lighting and GeometryLighting and Geometry Prof. Michael Misha Kazhdan misha· The viewer · The lights N Viewer · The lights · The geometry · The surface properties N L2 V Viewer L1Outline · Surface Properties (Review) · Lighting· Lighting · Geometry· Geometry #12;Surface Properties (Review
External-Memory Computational Geometry
Goodrich, Michael T.; Tsay, Jyh-Jong; Vengroff, Darren Erik; Vitter, Jeffrey Scott
1993-01-01T23:59:59.000Z
In this paper we give new techniques for designing e cient algorithms for computational geometry prob- lems that are too large to be solved in internal mem- ory. We use these techniques to develop optimal and practical algorithms for a number...
Differential Geometry: Discrete Exterior Calculus
Kazhdan, Michael
Differential Geometry: Discrete Exterior Calculus [Build Your Own DEC at Home. Elcott et al., 2006] [Discrete Differential Forms for Computational Modeling. Desbrun et al., 2005] [Discrete Exterior Calculus-simplices in : where c is a real-valued function. The space of k-chains is denoted Ck(). = k cc )( #12;Chains
Holographic thermalization in noncommutative geometry
Xiao-Xiong Zeng; Xian-Ming Liu; Wen-Biao Liu
2015-05-02T23:59:59.000Z
Gravitational collapse of a shell of dust in noncommutative geometry is probed by the renormalized geodesic length, which is dual to probe the thermalization by the two-point correlation function in the dual conformal field theory. We find that larger the noncommutative parameter is, longer the thermalization time is, which implies that the large noncommutative parameter delays the thermalization process. We also investigate how the noncommutative parameter affects the thermalization velocity and thermalization acceleration.
Gauge theories in noncommutative geometry
Thierry Masson
2012-01-16T23:59:59.000Z
In this review we present some of the fundamental mathematical structures which permit to define noncommutative gauge field theories. In particular, we emphasize the theory of noncommutative connections, with the notions of curvatures and gauge transformations. Two different approaches to noncommutative geometry are covered: the one based on derivations and the one based on spectral triples. Examples of noncommutative gauge field theories are given to illustrate the constructions and to display some of the common features.
Centrifugal force in Kerr geometry
Sai Iyer; A R Prasanna
1992-07-31T23:59:59.000Z
We have obtained the correct expression for the centrifugal force acting on a particle at the equatorial circumference of a rotating body in the locally non-rotating frame of the Kerr geometry. Using this expression for the equilibrium of an element on the surface of a slowly rotating Maclaurin spheroid, we obtain the expression for the ellipticity (as discussed earlier by Abramowicz and Miller) and determine the radius at which the ellipticity is maximum.
Disformal transformation in Newton-Cartan geometry
Huang, Peng
2015-01-01T23:59:59.000Z
Newton-Cartan geometry has played a central role in recent discussions of non-relativistic holography and condensed matter systems. Although the conformal transformation in non-relativistic holography can be easily rephrased in Newton-Cartan geometry, we show that it requires a nontrivial procedure to get the consistent form of anisotropic disformal transformation in this geometry. Furthermore, as an application of the newly obtained disformal transformation, we use it to induce a new geometry.
Disformal transformation in Newton-Cartan geometry
Peng Huang; Fang-Fang Yuan
2015-09-20T23:59:59.000Z
Newton-Cartan geometry has played a central role in recent discussions of non-relativistic holography and condensed matter systems. Although the conformal transformation in non-relativistic holography can be easily rephrased in Newton-Cartan geometry, we show that it requires a nontrivial procedure to get the consistent form of anisotropic disformal transformation in this geometry. Furthermore, as an application of the newly obtained disformal transformation, we use it to induce a new geometry.
Optimization Online - Equivalence of Convex Problem Geometry ...
Robert Freund
2009-02-07T23:59:59.000Z
Feb 7, 2009 ... Equivalence of Convex Problem Geometry and Computational Complexity in the Separation Oracle Model. Robert Freund (rfreund ***at*** ...
Generalised complex geometry in thermodynamical fluctuation theory
P. Fernandez de Cordoba; J. M. Isidro
2015-05-28T23:59:59.000Z
We present a brief overview of some key concepts in the theory of generalised complex manifolds. This new geometry interpolates, so to speak, between symplectic geometry and complex geometry. As such it provides an ideal framework to analyse thermodynamical fluctuation theory in the presence of gravitational fields.
Towards a Nano Geometry? Geometry and Dynamics on Nano Scale
Bernhelm Booss-Bavnbek
2012-02-23T23:59:59.000Z
This paper applies I.M. Gelfand's distinction between adequate and non-adequate use of mathematical language in different contexts to the newly opened window of model-based measurements of intracellular dynamics. The specifics of geometry and dynamics on the mesoscale of cell physiology are elaborated - in contrast to the familiar Newtonian mechanics and the more recent, but by now also rather well established quantum field theories. Examples are given originating from the systems biology of insulin secreting pancreatic beta-cells and the mathematical challenges of an envisioned non-invasive control of magnetic nanoparticles.
Thermodynamic geometry of holographic superconductors
Basak, Sayan; Nandi, Poulami; Sengupta, Gautam
2015-01-01T23:59:59.000Z
We obtain the thermodynamic geometry of a (2+1) dimensional strongly coupled quantum field theory at a finite temperature in a holographic set up through the gauge/gravity correspondence. The bulk dual gravitational theory is described by a 3+1 dimensional charged AdS black hole in the presence of a charged massive scalar field. The holographic free energy of the (2+1) dimensional strongly coupled boundary field theory is computed analytically through the bulk boundary correspondence. The thermodynamic metric and the corresponding scalar curvature is then obtained from the holographic free energy. The thermodynamic scalar curvature characterizes the superconducting phase transition of the boundary field theory.
Thermodynamic geometry of holographic superconductors
Sayan Basak; Pankaj Chaturvedi; Poulami Nandi; Gautam Sengupta
2015-09-21T23:59:59.000Z
We obtain the thermodynamic geometry of a (2+1) dimensional strongly coupled quantum field theory at a finite temperature in a holographic set up, through the gauge/gravity correspondence. The bulk dual gravitational theory is described by a (3+1) dimensional charged AdS black hole in the presence of a massive charged scalar field. The holographic free energy of the (2+1) dimensional strongly coupled boundary field theory is computed analytically through the bulk boundary correspondence. The thermodynamic metric and the corresponding scalar curvature is then obtained from the holographic free energy. The thermodynamic scalar curvature characterizes the superconducting phase transition of the boundary field theory.
Geometry Matters | The Ames Laboratory
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41clothThe Bonneville Power AdministrationHawaiiEnergyFlorida Julyanalysis,GeoSiphon Innovative ProcessWastesGeometry
Geometry of branes on supergroups
Thomas Creutzig
2008-09-02T23:59:59.000Z
In this note we analyze the geometry of maximally symmetric boundary conditions in Lie supergroup Wess-Zumino-Novikov-Witten models. We find that generically the worldvolume of a brane is a twisted superconjugacy class, very much like in the Lie group case. Whenever the brane is not completely delocalized in the fermionic directions a new atypical class of branes arises. We give an example of these new branes and show for type I supergroups and trivial gluing conditions that they can be naturally associated with atypical representations of the affine Lie superalgebra.
Thermodynamic geometry of holographic superconductors
Sayan Basak; Pankaj Chaturvedi; Poulami Nandi; Gautam Sengupta
2015-09-02T23:59:59.000Z
We obtain the thermodynamic geometry of a (2+1) dimensional strongly coupled quantum field theory at a finite temperature in a holographic set up through the gauge/gravity correspondence. The bulk dual gravitational theory is described by a 3+1 dimensional charged AdS black hole in the presence of a charged massive scalar field. The holographic free energy of the (2+1) dimensional strongly coupled boundary field theory is computed analytically through the bulk boundary correspondence. The thermodynamic metric and the corresponding scalar curvature is then obtained from the holographic free energy. The thermodynamic scalar curvature characterizes the superconducting phase transition of the boundary field theory.
Heuristic approach to the Schwarzschild geometry
Matt Visser
2004-03-11T23:59:59.000Z
In this article I present a simple Newtonian heuristic for deriving a weak-field approximation for the spacetime geometry of a point particle. The heuristic is based on Newtonian gravity, the notion of local inertial frames [the Einstein equivalence principle], plus the use of Galilean coordinate transformations to connect the freely falling local inertial frames back to the ``fixed stars''. Because of the heuristic and quasi-Newtonian manner in which the spacetime geometry is obtained, we are at best justified in expecting it to be a weak-field approximation to the true spacetime geometry. However, in the case of a spherically symmetric point mass the result is coincidentally an exact solution of the full vacuum Einstein field equations -- it is the Schwarzschild geometry in Painleve--Gullstrand coordinates. This result is much stronger than the well-known result of Michell and Laplace whereby a Newtonian argument correctly estimates the value of the Schwarzschild radius -- using the heuristic presented in this article one obtains the entire Schwarzschild geometry. The heuristic also gives sensible results -- a Riemann flat geometry -- when applied to a constant gravitational field. Furthermore, a subtle extension of the heuristic correctly reproduces the Reissner--Nordstrom geometry and even the de Sitter geometry. Unfortunately the heuristic construction is not truly generic. For instance, it is incapable of generating the Kerr geometry or anti-de Sitter space. Despite this limitation, the heuristic does have useful pedagogical value in that it provides a simple and direct plausibility argument for the Schwarzschild geometry.
The Structure of Spacetime and Noncommutative Geometry
Fedele Lizzi
2008-11-03T23:59:59.000Z
We give a general and nontechnical review of some aspects of noncommutative geometry as a tool to understand the structure of spacetime. We discuss the motivations for the constructions of a noncommutative geometry, and the passage from commutative to noncommutative spaces. We then give a brief description of Connes approach to the standard model, of the noncommutative geometry of strings and of field theory on noncommutative spaces. We also discuss the role of symmetries and some possible consequences for cosmology.
Hessian geometry and entanglement thermodynamics
Matsueda, Hiroaki
2015-01-01T23:59:59.000Z
We reconstruct entanglement thermodynamics by means of Hessian geometry, since this method exactly generalizes thermodynamics into much wider exponential family cases including quantum entanglement. Starting with the correct first law of entanglement thermodynamics, we derive that a proper choice of the Hessian potential leads to both of the entanglement entropy scaling for quantum critical systems and hyperbolic metric (or AdS space with imaginary time). We also derive geometric representation of the entanglement entropy in which the entropy is described as integration of local conserved current of information flowing across an entangling surface. We find that the entangling surface is equivalent to the domain boundary of the Hessian potential. This feature originates in a special property of critical systems in which we can identify the entanglement entropy with the Hessian potential after the second derivative by the canonical parameters, and this identification guarantees violation of extensive nature of ...
Hessian geometry and entanglement thermodynamics
Hiroaki Matsueda
2015-08-11T23:59:59.000Z
We reconstruct entanglement thermodynamics by means of Hessian geometry, since this method exactly generalizes thermodynamics into much wider exponential family cases including quantum entanglement. Starting with the correct first law of entanglement thermodynamics, we derive that a proper choice of the Hessian potential leads to both of the entanglement entropy scaling for quantum critical systems and hyperbolic metric (or AdS space with imaginary time). We also derive geometric representation of the entanglement entropy in which the entropy is described as integration of local conserved current of information flowing across an entangling surface. We find that the entangling surface is equivalent to the domain boundary of the Hessian potential. This feature originates in a special property of critical systems in which we can identify the entanglement entropy with the Hessian potential after the second derivative by the canonical parameters, and this identification guarantees violation of extensive nature of the entropy.
Line geometry and electromagnetism I: basic structures
D. H. Delphenich
2013-09-11T23:59:59.000Z
Some key notions of line geometry are recalled, along with their application to mechanics. It is then shown that most of the basic structures that one introduces in the pre-metric formulation of electromagnetism can be interpreted directly in terms of corresponding concepts in line geometry. The results are summarized in a table.
Hydraulic Geometry: Empirical Investigations and Theoretical Approaches
Eaton, Brett
Hydraulic Geometry: Empirical Investigations and Theoretical Approaches B.C. Eatona, a Department of Geography, The University of British Columbia 1984 West Mall, Vancouver, BC, V6T 1Z2 Abstract Hydraulic. One approach to hydraulic geometry considers temporal changes at a single location due to variations
FINAL REPORT: GEOMETRY AND ELEMENTARY PARTICLE PHYSICS
Singer, Isadore M.
2008-03-04T23:59:59.000Z
The effect on mathematics of collaborations between high-energy theoretical physics and modern mathematics has been remarkable. Mirror symmetry has revolutionized enumerative geometry, and Seiberg-Witten invariants have greatly simplified the study of four manifolds. And because of their application to string theory, physicists now need to know cohomology theory, characteristic classes, index theory, K-theory, algebraic geometry, differential geometry, and non-commutative geometry. Much more is coming. We are experiencing a deeper contact between the two sciences, which will stimulate new mathematics essential to the physicists’ quest for the unification of quantum mechanics and relativity. Our grant, supported by the Department of Energy for twelve years, has been instrumental in promoting an effective interaction between geometry and string theory, by supporting the Mathematical Physics seminar, postdoc research, collaborations, graduate students and several research papers.
Lara B. Anderson; Jonathan J. Heckman; Sheldon Katz
2014-06-06T23:59:59.000Z
T-branes are a non-abelian generalization of intersecting branes in which the matrix of normal deformations is nilpotent along some subspace. In this paper we study the geometric remnant of this open string data for six-dimensional F-theory vacua. We show that in the dual M-theory / IIA compactification on a smooth Calabi-Yau threefold X, the geometric remnant of T-brane data translates to periods of the three-form potential valued in the intermediate Jacobian of X. Starting from a smoothing of a singular Calabi-Yau, we show how to track this data in singular limits using the theory of limiting mixed Hodge structures, which in turn directly points to an emergent Hitchin-like system coupled to defects. We argue that the physical data of an F-theory compactification on a singular threefold involves specifying both a geometry as well as the remnant of three-form potential moduli and flux which is localized on the discriminant. We give examples of T-branes in compact F-theory models with heterotic duals, and comment on the extension of our results to four-dimensional vacua.
Emergent geometry from random multitrace matrix models
B. Ydri; A. Rouag; K. Ramda
2015-09-11T23:59:59.000Z
A novel scenario for the emergence of geometry in random multitrace matrix models of a single hermitian matrix $M$ with unitary $U(N) $ invariance, i.e. without a kinetic term, is presented. In particular, the dimension of the emergent geometry is determined from the critical exponents of the disorder-to-uniform-ordered transition whereas the metric is determined from the Wigner semicircle law behavior of the eigenvalues distribution of the matrix $M$. If the uniform ordered phase is not sustained in the phase diagram then there is no emergent geometry in the multitrace matrix model.
The geometry of sound rays in a wind
G. W. Gibbons; C. M. Warnick
2011-02-11T23:59:59.000Z
We survey the close relationship between sound and light rays and geometry. In the case where the medium is at rest, the geometry is the classical geometry of Riemann. In the case where the medium is moving, the more general geometry known as Finsler geometry is needed. We develop these geometries ab initio, with examples, and in particular show how sound rays in a stratified atmosphere with a wind can be mapped to a problem of circles and straight lines.
Topology to geometry in protein folding: -Lactoglobulin
Berry, R. Stephen
Topology to geometry in protein folding: -Lactoglobulin Ariel Ferna´ndez* , Andre´s Colubri , and R angles and at the -carbon atoms of the peptide backbone dominate protein folding. Next in importance
Emergence of wave equations from quantum geometry
Majid, Shahn [School of Mathematical Sciences, Queen Mary University of London, 327 Mile End Rd, London E1 4NS (United Kingdom)
2012-09-24T23:59:59.000Z
We argue that classical geometry should be viewed as a special limit of noncommutative geometry in which aspects which are inter-constrained decouple and appear arbitrary in the classical limit. In particular, the wave equation is really a partial derivative in a unified extra-dimensional noncommutative geometry and arises out of the greater rigidity of the noncommutative world not visible in the classical limit. We provide an introduction to this 'wave operator' approach to noncommutative geometry as recently used[27] to quantize any static spacetime metric admitting a spatial conformal Killing vector field, and in particular to construct the quantum Schwarzschild black hole. We also give an introduction to our related result that every classical Riemannian manifold is a shadow of a slightly noncommutative one wherein the meaning of the classical Ricci tensor becomes very natural as the square of a generalised braiding.
Two-Parameter Dynamics and Geometry
Zhi Hu; Mulin Yan; Sen Hu
2015-01-10T23:59:59.000Z
In this paper we present the two-parameter dynamics which is implied by the law of inertia in flat spacetime. A remarkable perception is that (A)dS4 geometry may emerge from the two-parameter dynamics, which exhibits some phenomenon of dynamics/ geometry correspondence. We also discuss the Unruh effects within the context of two-parameter dynamics. In the last section we construct various invariant actions with respect to the broken symmetry groups.
Finite Field Theory on Noncommutative Geometries
S. Cho; R. Hinterding; J. Madore; H. Steinacker
1999-07-24T23:59:59.000Z
The propagator is calculated on a noncommutative version of the flat plane and the Lobachevsky plane with and without an extra (euclidean) time parameter. In agreement with the general idea of noncommutative geometry it is found that the limit when the two `points' coincide is finite and diverges only when the geometry becomes commutative. The flat 4-dimensional case is also considered. This is at the moment less interesting since there has been no curved case developed with which it can be compared.
Finite Geometry and the Radon Transform
Michael Revzen
2011-11-20T23:59:59.000Z
Finite Geometry is used to underpin operators acting in finite, d, dimensional Hilbert space. Quasi distribution and Radon transform underpinned with finite dual affine plane geometry (DAPG) are defined in analogy with the continuous ($d \\rightarrow \\infty$) Hilbert space case. An essntial role in these definitions play the projectors of states of mutual unbiased bases (MUB) and their Wigner function-like mapping onto the generalized phase space that lines and points of DAPG constitutes.
Beam geometry selection using sequential beam addition
Popple, Richard A., E-mail: rpopple@uabmc.edu; Brezovich, Ivan A.; Fiveash, John B. [Department of Radiation Oncology, The University of Alabama at Birmingham, 1720 2nd Avenue South, Birmingham, Alabama 35294 (United States)] [Department of Radiation Oncology, The University of Alabama at Birmingham, 1720 2nd Avenue South, Birmingham, Alabama 35294 (United States)
2014-05-15T23:59:59.000Z
Purpose: The selection of optimal beam geometry has been of interest since the inception of conformal radiotherapy. The authors report on sequential beam addition, a simple beam geometry selection method, for intensity modulated radiation therapy. Methods: The sequential beam addition algorithm (SBA) requires definition of an objective function (score) and a set of candidate beam geometries (pool). In the first iteration, the optimal score is determined for each beam in the pool and the beam with the best score selected. In the next iteration, the optimal score is calculated for each beam remaining in the pool combined with the beam selected in the first iteration, and the best scoring beam is selected. The process is repeated until the desired number of beams is reached. The authors selected three treatment sites, breast, lung, and brain, and determined beam arrangements for up to 11 beams from a pool comprised of 25 equiangular transverse beams. For the brain, arrangements were additionally selected from a pool of 22 noncoplanar beams. Scores were determined for geometries comprised equiangular transverse beams (EQA), as well as two tangential beams for the breast case. Results: In all cases, SBA resulted in scores superior to EQA. The breast case had the strongest dependence on beam geometry, for which only the 7-beam EQA geometry had a score better than the two tangential beams, whereas all SBA geometries with more than two beams were superior. In the lung case, EQA and SBA scores monotonically improved with increasing number of beams; however, SBA required fewer beams to achieve scores equivalent to EQA. For the brain case, SBA with a coplanar pool was equivalent to EQA, while the noncoplanar pool resulted in slightly better scores; however, the dose-volume histograms demonstrated that the differences were not clinically significant. Conclusions: For situations in which beam geometry has a significant effect on the objective function, SBA can identify arrangements equivalent to equiangular geometries but using fewer beams. Furthermore, SBA provides the value of the objective function as the number of beams is increased, allowing the planner to select the minimal beam number that achieves the clinical goals. The method is simple to implement and could readily be incorporated into an existing optimization system.
Studier, F. William (Stony Brook, NY)
1995-04-18T23:59:59.000Z
Random and directed priming methods for determining nucleotide sequences by enzymatic sequencing techniques, using libraries of primers of lengths 8, 9 or 10 bases, are disclosed. These methods permit direct sequencing of nucleic acids as large as 45,000 base pairs or larger without the necessity for subcloning. Individual primers are used repeatedly to prime sequence reactions in many different nucleic acid molecules. Libraries containing as few as 10,000 octamers, 14,200 nonamers, or 44,000 decamers would have the capacity to determine the sequence of almost any cosmid DNA. Random priming with a fixed set of primers from a smaller library can also be used to initiate the sequencing of individual nucleic acid molecules, with the sequence being completed by directed priming with primers from the library. In contrast to random cloning techniques, a combined random and directed priming strategy is far more efficient.
Studier, F.W.
1995-04-18T23:59:59.000Z
Random and directed priming methods for determining nucleotide sequences by enzymatic sequencing techniques, using libraries of primers of lengths 8, 9 or 10 bases, are disclosed. These methods permit direct sequencing of nucleic acids as large as 45,000 base pairs or larger without the necessity for subcloning. Individual primers are used repeatedly to prime sequence reactions in many different nucleic acid molecules. Libraries containing as few as 10,000 octamers, 14,200 nonamers, or 44,000 decamers would have the capacity to determine the sequence of almost any cosmid DNA. Random priming with a fixed set of primers from a smaller library can also be used to initiate the sequencing of individual nucleic acid molecules, with the sequence being completed by directed priming with primers from the library. In contrast to random cloning techniques, a combined random and directed priming strategy is far more efficient. 2 figs.
Topology Changing Transitions in Bubbling Geometries
Horava, Petr; Shepard, Peter G.
2005-02-15T23:59:59.000Z
Topological transitions in bubbling half-BPS Type IIB geometries with SO(4) x SO(4) symmetry can be decomposed into a sequence of n elementary transitions. The half-BPS solution that describes the elementary transition is seeded by a phase space distribution of fermions filling two diagonal quadrants. We study the geometry of this solution in some detail. We show that this solution can be interpreted as a time dependent geometry, interpolating between two asymptotic pp-waves in the far past and the far future. The singular solution at the transition can be resolved in two different ways, related by the particle-hole duality in the effective fermion description. Some universal features of the topology change are governed by two-dimensional Type 0B string theory, whose double scaling limit corresponds to the Penrose limit of AdS_5 x S5 at topological transition. In addition, we present the full class of geometries describing the vicinity of the most general localized classical singularity that can occur in this class of half-BPS bubbling geometries.
Condat, Laurent
gipsa-lab AGPiG ARCHITECTURE GEOMETRY PERCEPTION IMAGES GESTURES Team AGPiG-Architecture geometry models Dynamic architecture management TOPICS LEADERS Dominique ATTALI Dominique HOUZET 5 researchers Expressions identification Visual attention 3D ci rcuit architecture #12;gipsa-lab Team AGPiG-Architecture
Chapter I. The Basics of Noncommutative Geometry 7 1. Connes' Noncommutative Geometry 8
Sitarz, Andrzej
and last not least noncommutative geometry methods in quantum field theory 81T75. The entire subject only superficially related to quan- tum mechanics or quantum field theory might be the right one - bothContents Wstep 2 Foreword 3 Chapter I. The Basics of Noncommutative Geometry 7 1. Connes
Noncommutative geometry and twisted conformal symmetry
Matlock, Peter [Institute of Mathematical Sciences, Chennai (India)
2005-06-15T23:59:59.000Z
The twist-deformed conformal algebra is constructed as a Hopf algebra with twisted coproduct. This allows for the definition of conformal symmetry in a noncommutative background geometry. The twisted coproduct is reviewed for the Poincare algebra and the construction is then extended to the full conformal algebra. The case of Moyal-type noncommutativity of the coordinates is considered. It is demonstrated that conformal invariance need not be viewed as incompatible with noncommutative geometry; the noncommutativity of the coordinates appears as a consequence of the twisting, as has been shown in the literature in the case of the twisted Poincare algebra.
J. ALGEBRAIC GEOMETRY 00 (XXXX) 000000
Rimányi, Richárd
J. ALGEBRAIC GEOMETRY 00 (XXXX) 000000 S 1056-3911(XX)0000-0 THE DEGREE OF THE DISCRIMINANT algebraic group, and let : G GL(V ) be an irreducible algebraic representation. Then induces an action], Lascoux [18], Boole, Tevelev [21], Gelfand-Kapranov-Zelevinsky [12, Ch.13,14], see a summary in [22, Ch.7
Noncommutative Geometry 24 July 22 December 2006
- rose tilings, the noncommutative torus T2 which plays a role in the quantum Hall effect and in M-theory-functions of number theory. The new theory of `noncommutative geometry' that has developed in the last three decades. They also have applications for example in the book- keeping of divergences in quantum field theories
Optimal distillation using thermodynamic geometry Bjarne Andresen
Salamon, Peter
Optimal distillation using thermodynamic geometry Bjarne Andresen Ørsted Laboratory, University of a distillation column may be improved by permitting heat exchange on every tray rather than only in the reboiler (temperature, pressure, etc.) define successive states in a sequence of equilibria. Fractional distillation [2
ACCELERATION INDUCED SPIN ITS GAUGE GEOMETRY
Gerlach, Ulrich
@math.ohioÂstate.edu ABSTRACT Does there exist a purely quantum mechanical characterization of gravitation? To this end at each event. A unique and natural law of parallel transport of quantum states between different events conclusion that gravitation is to be identified with the gauge geometry of the group [SU(1; 1)] 1 . #12
Inhabiting the square; a geometry for path and space
Joslin, Alan Royal
1982-01-01T23:59:59.000Z
Geometries and geometric systems are not architecture, though architecture is geometric. Geometries and geometric systems, because of their autonomous nature, are generally understandable and can serve as the basis of ...
Damage experiments in a cylindrical geometry
Kaul, Ann M [Los Alamos National Laboratory
2010-09-21T23:59:59.000Z
Studying spallation damage with a cylindrical configuration allows for a natural recollection of the damaged material under proper driving conditions. Additionally, the damaged material can come to a complete rest without the application of further stopping forces. Specific areas of research include the damage initiation regime in convergent geometry, behavior of material recollected after damage, and effects of convergent geometry on the material response. Such experiments produce unique strain and shear stress states, motivating improvements in existing computational material models and increasing the predictive capabilities of codes. A LANL/VNIIEF joint experimental series has produced cylindrical aluminum failure initiation data and studied the behavior of material recollected after damage initiation and after complete failure. In addition to post-shot collection of the damaged target material for subsequent metallographic analysis, dynamic in-situ experimental diagnostics include velocimetry and transverse radial radiography. This paper will discuss the current experimental status.
The Maslov index in PDEs geometry
Agostino Prástaro
2015-04-27T23:59:59.000Z
It is proved that the Maslov index naturally arises in the framework of PDEs geometry. The characterization of PDE solutions by means of Maslov index is given. With this respect, Maslov index for Lagrangian submanifolds is given on the ground of PDEs geometry. New formulas to calculate bordism groups of $(n-1)$-dimensional compact sub-manifolds bording via $n$-dimensional Lagrangian submanifolds of a fixed $2n$-dimensional symplectic manifold are obtained too. As a by-product it is given a new proof of global smooth solutions existence, defined on all $\\mathbb{R}^3$, for the Navier-Stokes PDE. Further, complementary results are given in Appendices concerning Navier-Stokes PDE and Legendrian submanifolds of contact manifolds.
Analytic Coleman-de Luccia Geometries
Dong, Xi; /Stanford U., ITP /Stanford U., Phys. Dept. /SLAC; Harlow, Daniel; /Stanford U., ITP /Stanford U., Phys. Dept.
2012-02-16T23:59:59.000Z
We present the necessary and sufficient conditions for a Euclidean scale factor to be a solution of the Coleman-de Luccia equations for some analytic potential V ({psi}), with a Lorentzian continuation describing the growth of a bubble of lower-energy vacuum surrounded by higher-energy vacuum. We then give a set of explicit examples that satisfy the conditions and thus are closed-form analytic examples of Coleman-de Luccia geometries.
Some integral geometry problems on Finsler and Riemannian ...
Yernat M. Assylbekov
2012-06-23T23:59:59.000Z
Institute of Mathematics Informatics and Mechanics. Kazakhstan. Joint work with Nurlan Dairbekov. Yernat M. Assylbekov. Integral geometry problems on Finsler ...
TOPICS IN ABSOLUTE ANABELIAN GEOMETRY III: GLOBAL RECONSTRUCTION ALGORITHMS
Anabelian Geometry §I3. Dismantling the Two Combinatorial Dimensions of a Ring §I4. Mono-anabelian Log
Harmonic Analysis and Geometries of Digital Data Bases
Maggioni, Mauro
Harmonic Analysis and Geometries of Digital Data Bases AMS Session Special Sesson, 2010 () Harmonic Analysis of Data Bases January 14, 2010 1 / 41 #12;Local geometry described by a graph, Gavish) Harmonic Analysis of Data Bases January 14, 2010 2 / 41 #12;Local geometry described by a graph
university-logo Affine space forms and hyperbolic geometry
Goldman, William
university-logo Affine space forms and hyperbolic geometry 3-dimensional affine space forms University of Singapore #12;university-logo Affine space forms and hyperbolic geometry Euclidean manifolds. #12;university-logo Affine space forms and hyperbolic geometry Euclidean manifolds When can a group G
Loy, D.A.; Carpenter, J.P.; Yamanaka, S.A.; McClain, M.D. [Sandia National Labs., Albuquerque, NM (United States). Encapsulants and Foams Dept.] [Sandia National Labs., Albuquerque, NM (United States). Encapsulants and Foams Dept.; Greaves, J.; Hobson, S.; Shea, K.J. [Univ. of California, Irvine, CA (United States). Dept. of Chemistry] [Univ. of California, Irvine, CA (United States). Dept. of Chemistry
1998-12-01T23:59:59.000Z
In this study, the authors utilized the substitution geometry of triethoxysilyl groups about an organic bridging group to control the outcome of the sol-gel polymerization process. The substitution geometry of two triethoxysilyl groups about a carbon-carbon double bond was determined to have a profound effect on sol-gel polymerizations of the E (1) and Z (2) ethenylene-bridged monomers and vinylidene-bridged monomer (3) and on the porosity in the resulting xerogels. {sup 29}Si NMR and chemical ionization mass spectrometry were used to elucidate the early sol-gel chemistry in the acid-catalyzed polymerizations of 1--3. Trans substitution about the ethenylene-bridging group in 1 led to acyclic and monocyclic dimers and trimers as condensation products under acidic conditions and only microporous gels under both acidic and basic conditions. In contrast, cyclization reactions dominated the sol-gel chemistry of 2 beginning with intramolecular cyclization to give the cyclic disilsesquioxane (4) and continued with the formation of cyclic oligomers, including a bicyclic dimer. The cyclization of 2 slowed the rate of gelation compared to 1 and afforded microporous xerogels under acidic conditions and mesoporous gels under basic conditions. The sol-gel chemistry of the vinylidene monomer (3) was strongly retarded by the formation of a cyclic dimer (5). Only mesoporous gels were formed under basic conditions after 9 months; no gels were obtained under acidic conditions.
Asphaltene damage in matrix acidizing
Hinojosa, Roberto Antonio
1996-01-01T23:59:59.000Z
were acidized with three stage treatments of 15% hydrochloric acid (HCl), 12% HCL-3% hydrofluoric acid (HF) and 15% HCL. No additives were used in the acid. Comparisons were made between cores acidized with a variety of saturating fluids. Petrographic...
Generalized geometry of two-dimensional vacua
Dario Rosa
2014-12-05T23:59:59.000Z
We derive the conditions for unbroken supersymmetry for a Mink_2, (2,0) vacuum, arising from Type II supergravity on a compact eight-dimensional manifold M_8. When specialized to internal manifolds enjoying SU(4)xSU(4) structure the resulting system is elegantly rewritten in terms of generalized complex geometry. This particular class of vacua violates the correspondence between supersymmetry conditions and calibrations conditions of D branes (supersymmetry-calibrations correspondence). Our analysis includes and extends previous results about the failure of the supersymmetry-calibrations correspondence, and confirms the existence of a precise relation between such a failure and a subset of the supersymmetry conditions.
Relativity of Space-Time Geometry
L. V. Verozub
1996-06-14T23:59:59.000Z
We argue that space-time geometry is not absolute with respect to the frame of reference being used. The space-time metric differential form $ds$ in noninertial frames of reference (NIFR) is caused by the properties of the used frames in accordance with the Berkley - Leibnitz - Mach - Poincar\\'{e} ideas about relativity of space and time . It is shown that the Sagnac effect and the existence of inertial forces in NIFR can be considered from this point of view. An experimental test is proposed.
Primicerio, Mario
A Free Boundary Problem for CaCO3 Neutralization of Acid Waters Lorenzo Fusi, Angiolo Farina, Mario kinetics of CaCO3 in an acid solution. In particular we study the system in planar geometry showing carbonate, CaCO3 ) that is particularly useful when available in crushed or pulverized form (because
Surveying Diffusion in Complex Geometries. An Essay
Denis Grebenkov
2009-09-08T23:59:59.000Z
The surrounding world surprises us by the beauty and variety of complex shapes that emerge from nanometric to macroscopic scales. Natural or manufactured materials (sandstones, sedimentary rocks and cement), colloidal solutions (proteins and DNA), biological cells, tissues and organs (lungs, kidneys and placenta), they all present irregularly shaped "scenes" for a fundamental transport "performance", that is, diffusion. Here, the geometrical complexity, entangled with the stochastic character of diffusive motion, results in numerous fascinating and sometimes unexpected effects like diffusion screening or localization. These effects control many diffusion-mediated processes that play an important role in heterogeneous catalysis, biochemical mechanisms, electrochemistry, growth phenomena, oil recovery, or building industry. In spite of a long and rich history of academic and industrial research in this field, it is striking to see how little we know about diffusion in complex geometries, especially the one which occurs in three dimensions. We present our recent results on restricted diffusion. We look into the role of geometrical complexity at different levels, from boundary microroughness to hierarchical structure and connectivity of the whole diffusion-confining domain. We develop a new approach which consists in combining fast random walk algorithms with spectral tools. The main focus is on studying diffusion in model complex geometries (von Koch boundaries, Kitaoka acinus, etc.), as well as on developing and testing spectral methods. We aim at extending this knowledge and at applying the accomplished arsenal of theoretical and numerical tools to structures found in nature and industry.
Black Hole Initial Data with a Horizon of Prescribed Geometry
Brian Smith
2007-10-04T23:59:59.000Z
The purpose of this work is to construct asymptotically flat, time symmetric initial data with an apparent horizon of prescribed intrinsic geometry. To do this, we use the parabolic partial differential equation for prescribing scalar curvature. In this equation the horizon geometry is contained within the freely specifiable part of the metric. This contrasts with the conformal method in which the geometry of the horizon can only be specified up to a conformal factor.
Geometry and experience: Einstein's 1921 paper and Hilbert's axiomatic system
De Gandt, Francois [Universite Lille III, UMR 8163 'Savoirs et Textes', BP 60149, 59653 Villeneuve d'Ascq (France)
2006-06-19T23:59:59.000Z
In his 1921 paper Geometrie und Erfahrung, Einstein decribes the new epistemological status of geometry, divorced from any intuitive or a priori content. He calls that 'axiomatics', following Hilbert's theoretical developments on axiomatic systems, which started with the stimulus given by a talk by Hermann Wiener in 1891 and progressed until the Foundations of geometry in 1899. Difficult questions arise: how is a theoretical system related to an intuitive empirical content?.
Interferometric Probes of Planckian Quantum Geometry
Ohkyung Kwon; Craig J. Hogan
2015-02-24T23:59:59.000Z
The effect of Planck scale quantum geometrical effects on measurements with interferometers is estimated with standard physics, and with a variety of proposed extensions. It is shown that effects are negligible in standard field theory with canonically quantized gravity. Statistical noise levels are estimated in a variety of proposals for non-standard metric fluctuations, and these alternatives are constrained using upper bounds on stochastic metric fluctuations from LIGO. Idealized models of several interferometer system architectures are used to predict signal noise spectra in a quantum geometry that cannot be described by a fluctuating metric, in which position noise arises from holographic bounds on directional information. Predictions in this case are shown to be close to current and projected experimental bounds.
Complex geometry and pre-metric electromagnetism
D. H. Delphenich
2004-12-10T23:59:59.000Z
The intimate link between complex geometry and the problem of the pre-metric formulation of electromagnetism is explored. In particular, the relationship between 3+1 decompositions of R4 and the decompositions of the vector space of bivectors over R4 into real and imaginary subspaces relative to a choice of complex structure is emphasized. The role of the various scalar products on the space of bivectors that are defined in terms of a volume element on R4 and a complex structure on the space of bivectors that makes it C-linear isomorphic to C3 is discussed in the context of formulation of a theory of electromagnetism in which the Lorentzian metric on spacetime follows as a consequence of the existence of electromagnetic waves, not a prior assumption.
The Sticky Geometry of the Cosmic Web
Johan Hidding; Rien van de Weygaert; Gert Vegter; Bernard J. T. Jones; Monique Teillaud
2012-05-08T23:59:59.000Z
In this video we highlight the application of Computational Geometry to our understanding of the formation and dynamics of the Cosmic Web. The emergence of this intricate and pervasive weblike structure of the Universe on Megaparsec scales can be approximated by a well-known equation from fluid mechanics, the Burgers' equation. The solution to this equation can be obtained from a geometrical formalism. We have extended and improved this method by invoking weighted Delaunay and Voronoi tessellations. The duality between these tessellations finds a remarkable and profound reflection in the description of physical systems in Eulerian and Lagrangian terms. The resulting Adhesion formalism provides deep insight into the dynamics and topology of the Cosmic Web. It uncovers a direct connection between the conditions in the very early Universe and the complex spatial patterns that emerged out of these under the influence of gravity.
Noncommutative geometry induced by spin effects
Colatto, L.P.; Penna, A.L.A.; Santos, W.C. [Departamento de Fisica, Centro de Ciencias Exatas, Universidade Federal do Espirito Santo, Avenue Fernando Ferrari, 514, CEP 29075-910, Vitoria, ES (Brazil); Instituto de Fisica, Universidade de Brasilia, CEP 70919-970, Brasilia, DF (Brazil)
2006-05-15T23:59:59.000Z
In this paper we study the nonlocal effects of noncommutative spacetime on simple physical systems. Our main point is the assumption that the noncommutative effects are consequences of a background field which generates a local spin structure. So, we reformulate some simple electrostatic models in the presence of a spin-deformation contribution to the geometry of the motion, and we obtain an interesting correlation amongst the deformed area vector, the 3D noncommutative effects, and the usual spin vector S-vector given in quantum mechanics framework. Remarkably we can observe that a spin-orbit coupling term comes to light on the spatial sector of a potential written in terms of noncommutative coordinates which indicates that bound states are particular cases in this procedure. Concerning confined or bounded particles in this noncommutative domain, we verify that the kinetic energy is modified by a deformation factor. Finally, we discuss perspectives.
efficient spectral-galerkin methods iv. spherical geometries
1999-10-21T23:59:59.000Z
numerical weather prediction. The most natural way to deal with spherical geometries is to use spherical coordi- nates and spherical harmonic functions.
Topologies to geometries in protein folding: Hierarchical and nonhierarchical scenarios
Berry, R. Stephen
Topologies to geometries in protein folding: Hierarchical and nonhierarchical scenarios Ariel Ferna presents a method to portray protein folding dynamics at a coarse resolution, based on a pattern
Supersymmetry and noncommutative geometry Part I: Supersymmetric almost-commutative geometries
Wim Beenakker; Walter D. van Suijlekom; Thijs van den Broek
2014-09-21T23:59:59.000Z
Noncommutative geometry has seen remarkable applications for high energy physics, viz. the geometrical interpretation of the Standard Model. The question whether it also allows for supersymmetric theories has so far not been answered in a conclusive way. In this first of three papers we do a systematic analysis of the possibilities for almost-commutative geometries on a 4-dimensional, flat background to exhibit not only a particle content that is eligible for supersymmetry but also have a supersymmetric action. We come up with an approach in which we identify the basic 'building blocks' of potentially supersymmetric theories and the demands for their action to be supersymmetric. Examples that satisfy these demands turn out to be sparse.
Supersymmetry and noncommutative geometry Part I: Supersymmetric almost-commutative geometries
Beenakker, Wim; Broek, Thijs van den
2014-01-01T23:59:59.000Z
Noncommutative geometry has seen remarkable applications for high energy physics, viz. the geometrical interpretation of the Standard Model. The question whether it also allows for supersymmetric theories has so far not been answered in a conclusive way. In this first of three papers we do a systematic analysis of the possibilities for almost-commutative geometries on a 4-dimensional, flat background to exhibit not only a particle content that is eligible for supersymmetry but also have a supersymmetric action. We come up with an approach in which we identify the basic 'building blocks' of potentially supersymmetric theories and the demands for their action to be supersymmetric. Examples that satisfy these demands turn out to be sparse.
Prudent, James R. (Madison, WI); Hall, Jeff G. (Madison, WI); Lyamichev, Victor L. (Madison, WI); Brow, Mary Ann D. (Madison, WI); Dahlberg, James E. (Madison, WI)
2007-12-11T23:59:59.000Z
The present invention relates to means for the detection and characterization of nucleic acid sequences, as well as variations in nucleic acid sequences. The present invention also relates to methods for forming a nucleic acid cleavage structure on a target sequence and cleaving the nucleic acid cleavage structure in a site-specific manner. The structure-specific nuclease activity of a variety of enzymes is used to cleave the target-dependent cleavage structure, thereby indicating the presence of specific nucleic acid sequences or specific variations thereof.
Prudent, James R. (Madison, WI); Hall, Jeff G. (Waunakee, WI); Lyamichev, Victor I. (Madison, WI); Brow; Mary Ann D. (Madison, WI); Dahlberg, James E. (Madison, WI)
2010-11-09T23:59:59.000Z
The present invention relates to means for the detection and characterization of nucleic acid sequences, as well as variations in nucleic acid sequences. The present invention also relates to methods for forming a nucleic acid cleavage structure on a target sequence and cleaving the nucleic acid cleavage structure in a site-specific manner. The structure-specific nuclease activity of a variety of enzymes is used to cleave the target-dependent cleavage structure, thereby indicating the presence of specific nucleic acid sequences or specific variations thereof.
Nucleic acid detection compositions
Prudent, James R. (Madison, WI); Hall, Jeff G. (Madison, WI); Lyamichev, Victor I. (Madison, WI); Brow, Mary Ann (Madison, WI); Dahlberg, James L. (Madison, WI)
2008-08-05T23:59:59.000Z
The present invention relates to means for the detection and characterization of nucleic acid sequences, as well as variations in nucleic acid sequences. The present invention also relates to methods for forming a nucleic acid cleavage structure on a target sequence and cleaving the nucleic acid cleavage structure in a site-specific manner. The structure-specific nuclease activity of a variety of enzymes is used to cleave the target-dependent cleavage structure, thereby indicating the presence of specific nucleic acid sequences or specific variations thereof.
Prudent, James R.; Hall, Jeff G.; Lyamichev, Victor I.; Brow, Mary Ann; Dahlberg, James E.
2005-04-05T23:59:59.000Z
The present invention relates to means for the detection and characterization of nucleic acid sequences, as well as variations in nucleic acid sequences. The present invention also relates to methods for forming a nucleic acid cleavage structure on a target sequence and cleaving the nucleic acid cleavage structure in a site-specific manner. The structure-specific nuclease activity of a variety of enzymes is used to cleave the target-dependent cleavage structure, thereby indicating the presence of specific nucleic acid sequences or specific variations thereof.
Process for the preparation of lactic acid and glyceric acid
Jackson, James E [Haslett, MI; Miller, Dennis J [Okemos, MI; Marincean, Simona [Dewitt, MI
2008-12-02T23:59:59.000Z
Hexose and pentose monosaccharides are degraded to lactic acid and glyceric acid in an aqueous solution in the presence of an excess of a strongly anionic exchange resin, such as AMBERLITE IRN78 and AMBERLITE IRA400. The glyceric acid and lactic acid can be separated from the aqueous solution. Lactic acid and glyceric acid are staple articles of commerce.
Hall, Jeff G.; Lyamichev, Victor I.; Mast, Andrea L.; Brow, Mary Ann; Kwiatkowski, Robert W.; Vavra, Stephanie H.
2005-03-29T23:59:59.000Z
The present invention relates to means for the detection and characterization of nucleic acid sequences, as well as variations in nucleic acid sequences. The present invention also relates to methods for forming a nucleic acid cleavage structure on a target sequence and cleaving the nucleic acid cleavage structure in a site-specific manner. The structure-specific nuclease activity of a variety of enzymes is used to cleave the target-dependent cleavage structure, thereby indicating the presence of specific nucleic acid sequences or specific variations thereof. The present invention further relates to methods and devices for the separation of nucleic acid molecules based on charge. The present invention also provides methods for the detection of non-target cleavage products via the formation of a complete and activated protein binding region. The invention further provides sensitive and specific methods for the detection of nucleic acid from various viruses in a sample.
Microorganisms for producing organic acids
Pfleger, Brian Frederick; Begemann, Matthew Brett
2014-09-30T23:59:59.000Z
Organic acid-producing microorganisms and methods of using same. The organic acid-producing microorganisms comprise modifications that reduce or ablate AcsA activity or AcsA homolog activity. The modifications increase tolerance of the microorganisms to such organic acids as 3-hydroxypropionic acid, acrylic acid, propionic acid, lactic acid, and others. Further modifications to the microorganisms increase production of such organic acids as 3-hydroxypropionic acid, lactate, and others. Methods of producing such organic acids as 3-hydroxypropionic acid, lactate, and others with the modified microorganisms are provided. Methods of using acsA or homologs thereof as counter-selectable markers are also provided.
A Study Of Aperiodic (Random) Arrays of Various Geometries
Buchanan, Kristopher Ryan
2012-07-16T23:59:59.000Z
............. 15 Fig. 6. Geometry of an N-element periodic linear array....................................... 21 Fig. 7. Radiation intensity of 16 elements periodically spaced along the line (X-Axis) with spacing dx=.625.................................................................... 23 Fig. 8. Radiation intensity of 16 elements periodically spaced along the line (X-Axis).................................................................................................... 24 Fig. 9. Geometry of an N-element random...
Line geometry and electromagnetism III: groups of transformations
D. H. Delphenich
2014-04-16T23:59:59.000Z
The role of linear and projective groups of transformations in line geometry and electromagnetism is examined in accordance with Klein's Erlanger Programm for geometries. The group of collineations of real projective space is chosen as the most general group, and reductions to some of its various subgroups are then detailed according to their relevance to electromagnetic fields, and especially wave-like ones.
Mass Effects and Internal Space Geometry in Triatomic Reaction Dynamics
Koon, Wang Sang
Mass Effects and Internal Space Geometry in Triatomic Reaction Dynamics Tomohiro Yanao , Wang S reaction dynamics is analyzed using the geometry of the associated internal space. Atomic masses equations of motion, which act as velocity-dependent forces in a coordinate chart. By statistically averag
Horava-Lifshitz Gravity From Dynamical Newton-Cartan Geometry
Jelle Hartong; Niels A. Obers
2015-04-28T23:59:59.000Z
Recently it has been established that torsional Newton-Cartan (TNC) geometry is the appropriate geometrical framework to which non-relativistic field theories couple. We show that when these geometries are made dynamical they give rise to Horava-Lifshitz (HL) gravity. Projectable HL gravity corresponds to dynamical Newton-Cartan (NC) geometry without torsion and non-projectable HL gravity corresponds to dynamical NC geometry with twistless torsion (hypersurface orthogonal foliation). We build a precise dictionary relating all fields (including the scalar khronon), their transformations and other properties in both HL gravity and dynamical TNC geometry. We use TNC invariance to construct the effective action for dynamical twistless torsional Newton-Cartan geometries in 2+1 dimensions for dynamical exponent 1Thompson as coming from the Bargmann extension of the local Galilean algebra that acts on the tangent space to TNC geometries. We argue that TNC geometry, which is manifestly diffeomorphism covariant, is a natural geometrical framework underlying HL gravity and discuss some of its implications.
On Solving a Problem in Algebraic Geometry by Cluster Computing ?
program is implemented in the software library CASA on top of the computer algebra system Maple (computer algebra software for constructive algebraic geometry) which has been developed on topOn Solving a Problem in Algebraic Geometry by Cluster Computing ? Wolfgang Schreiner, Christian
Optimized Prediction for Geometry Compression of Triangle Meshes
Chiang, Yi-Jen
ACI-0118915. z yjc@poly.edu. Research supported in part by NSF Grant ACI-0118915, NSF CAREER Grant CCR- 0093373, and NSF ITR Grant CCR-0081964. x memon@poly.edu. Research supported in part by NSF Grant ACI for geometry compression, and has been adopted for the MPEG-4 standard for mesh geometry coding [18]. However
GRworkbench: A Computational System Based on Differential Geometry
Susan M Scott; Benjamin J K Evans; Antony C Searle
2001-11-19T23:59:59.000Z
We have developed a new tool for numerical work in General Relativity: GRworkbench. While past tools have been ad hoc, GRworkbench closely follows the framework of Differential Geometry to provide a robust and general way of computing on analytically defined space-times. We discuss the relationship between Differential Geometry and C++ classes in GRworkbench, and demonstrate their utility.
Derivation of hierarchies of reduced MHD models in Tokamak geometry
Paris-Sud XI, Université de
Derivation of hierarchies of reduced MHD models in Tokamak geometry Bruno Despr´es and R´emy Sart [8, 12], and the modeling of Tokamaks in axisymetric geometries for which we refer to the seminal in mind one key domain of application which is the numerical modeling of MHD stability in Tokamaks
Summer School on Applicable Algebraic Geometry: Additional Funding
Sottile, Frank
software. We will also have guest lectures explaining cur- rent research topics. This multi-tiered menu and techniques from algebraic geometry to problems in applied mathematics and engineering. Part thematic year "Applications of Algebraic Geometry" is showcasing these trends and will lead to further
Overture Past Interlude Present Interlude Future Finale Geometry's Future
Lee, Carl
Overture Past Interlude Present Interlude Future Finale Geometry's Future: Past, Present, and Future Carl Lee University of Kentucky http://www.ms.uky.edu/lee NCTM -- April 2011 Geometry's Future UK #12;Overture Past Interlude Present Interlude Future Finale Overture Past Interlude Present Interlude
Statistics and Differential Geometry 18-466 Mathematical Statistics
Le Ny, Jerome
Statistics and Differential Geometry 18-466 Mathematical Statistics Jerome Le Ny December 14, 2005 of statistical curvature [Efr75], that most of the main concepts and methods of differ- ential geometry are of substantial interest in connection with the theory of statistical inference. This report describes in simple
university-logo Affine space forms and hyperbolic geometry
Goldman, William
university-logo Affine space forms and hyperbolic geometry 3-dimensional affine space forms Mathematics Department Colloquium University of Illinois, Chicago #12;university-logo Affine space forms one commensurability class. #12;university-logo Affine space forms and hyperbolic geometry Euclidean
Mesh Geometry Compression for Mobile Graphics Jongseok Lee
Lee, Seungyong
, for mobile graphics, API standards such as OpenGL ES and JSR-184 have been proposed [8], and the graphicsMesh Geometry Compression for Mobile Graphics Jongseok Lee POSTECH thirdeye@postech.ac.kr Sungyul--This paper presents a compression scheme for mesh geometry, which is suitable for mobile graphics. The main
Twenty-second European Workshop on Computational Geometry Delphi, Greece
Karavelas, Menelaos
#12;Abstracts Twenty-second European Workshop on Computational Geometry Delphi, Greece March 27 by the authors. Workshop logo by Menelaos Karavelas. Printed in Greece. Sponsors UNIVERSITY OF IOANNINA Workshop on Computational Geometry held at Delphi, Greece, on March 27Â29, 2006. These papers are also
3-D cinematography with approximate and no geometry
Magnor, Marcus
3-D cinematography with approximate and no geometry Martin Eisemann, Timo Stich and Marcus Magnor Abstract 3-D cinematography is a new step towards full immersive video, allow- ing complete control of the book Image and Geometry Processing for 3-D Cinematography published by Springer. 1 Introduction
Early History of Algebra and Geometry Modern History
Tribute Early History of Algebra and Geometry Modern History From Algebraic to Weak Subintegral. Vitulli Algebraic to Subintegral Extensions #12;Tribute Early History of Algebra and Geometry Modern History Etta Zuber Falconer (1933 - 2002) "My entire career has been devoted to increasing the number
Friedmann Thermodynamics and the Geometry of the Universe
Selcuk S. Bayin
2008-04-01T23:59:59.000Z
In a recent article we have introduced Friedmann thermodynamics, where certain geometric parameters in Friedmann models are treated like their thermodynamic counterparts (temperature, entropy, Gibbs potential etc.). This model has the advantage of allowing us to determine the geometry of the universe by thermodynamic stability arguments. In this article we review connections between thermodynamics, geometry and cosmology.
Lensless x-ray imaging in reflection geometry
Roy, S.; Parks, D.H.; Seu, K.A.; Turner, J.J.; Chao, W.; Anderson, E.H.; Cabrini, S.; Kevan, S.D.; Su, R.
2011-02-03T23:59:59.000Z
Lensless X-ray imaging techniques such as coherent diffraction imaging and ptychography, and Fourier transform holography can provide time-resolved, diffraction-limited images. Nearly all examples of these techniques have focused on transmission geometry, restricting the samples and reciprocal spaces that can be investigated. We report a lensless X-ray technique developed for imaging in Bragg and small-angle scattering geometries, which may also find application in transmission geometries. We demonstrate this by imaging a nanofabricated pseudorandom binary structure in small-angle reflection geometry. The technique can be used with extended objects, places no restriction on sample size, and requires no additional sample masking. The realization of X-ray lensless imaging in reflection geometry opens up the possibility of single-shot imaging of surfaces in thin films, buried interfaces in magnetic multilayers, organic photovoltaic and field-effect transistor devices, or Bragg planes in a single crystal.
On Minkowski space and finite geometry
Marko Orel
2014-10-08T23:59:59.000Z
The main aim of this interdisciplinary paper is to characterize all maps on finite Minkowski space of arbitrary dimension $n$ that map pairs of distinct light-like events into pairs of distinct light-like events. Neither bijectivity of maps nor preservation of light-likeness in the opposite direction, i.e. from codomain to domain, is assumed. We succeed in in many cases, which include the one with $n$ divisible by 4 and the one with $n$ odd and $\\geq 9$, by showing that both bijectivity of maps and the preservation of light-likeness in the opposite direction is obtained automatically. In general, the problem of whether there exist non-bijective mappings that map pairs od distinct light-like events into pairs of distinct light-like events is shown to be related to one of the central problems in finite geometry, namely to existence of ovoids in orthogonal polar space. This problem is still unsolved in general despite a huge amount of research done in this area in the last few decades. The proofs are based on the study of a core of an affine polar graph, which yields results that are closely related to the ones obtained previously by Cameron and Kazanidis for the point graph of a polar space.
Geometry of Batalin-Vilkovisky quantization
Albert Schwarz
1992-05-26T23:59:59.000Z
The present paper is devoted to the study of geometry of Batalin-Vilkovisky quantization procedure. The main mathematical objects under consideration are P-manifolds and SP-manifolds (supermanifolds provided with an odd symplectic structure and, in the case of SP-manifolds, with a volume element). The Batalin-Vilkovisky procedure leads to consideration of integrals of the superharmonic functions over Lagrangian submanifolds. The choice of Lagrangian submanifold can be interpreted as a choice of gauge condition; Batalin and Vilkovisky proved that in some sense their procedure is gauge independent. We prove much more general theorem of the same kind. This theorem leads to a conjecture that one can modify the quantization procedure in such a way as to avoid the use of the notion of Lagrangian submanifold. In the next paper we will show that this is really so at least in the semiclassical approximation. Namely the physical quantities can be expressed as integrals over some set of critical points of solution S to the master equation with the integrand expressed in terms of Reidemeister torsion. This leads to a simplification of quantization procedure and to the possibility to get rigorous results also in the infinite-dimensional case. The present paper contains also a compete classification of P-manifolds and SP-manifolds. The classification is interesting by itself, but in this paper it plays also a role of an important tool in the proof of other results.
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
Dave Heldebrant
2012-12-31T23:59:59.000Z
Pacific Northwest National Laboratory scientist David Heldebrant demonstrates how a new process called reversible acid gas capture works to pull carbon dioxide out of power plant emissions.
Verser, Dan W. (Menlo Park, CA); Eggeman, Timothy J. (Lakewood, CO)
2011-11-01T23:59:59.000Z
A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. A tertiary amine and CO.sub.2 are introduced to the solution to form the insoluble carbonate salt and a complex between the acid and an amine. A water immiscible solvent, such as an alcohol, is added to extract the acid/amine complex from the dilute salt solution to a reaction phase. The reaction phase is continuously dried and a product between the acid and the solvent, such as an ester, is formed.
Verser, Dan W. (Golden, CO); Eggeman, Timothy J. (Lakewood, CO)
2009-10-13T23:59:59.000Z
A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. A tertiary amine and CO.sub.2 are introduced to the solution to form the insoluble carbonate salt and a complex between the acid and an amine. A water immiscible solvent, such as an alcohol, is added to extract the acid/amine complex from the dilute salt solution to a reaction phase. The reaction phase is continuously dried and a product between the acid and the solvent, such as an ester, is formed.
HYDROFLUORIC ACID Safety Office
Davis, Lloyd M.
in industrial processes: glass etching, metal cleaning, laboratory reagents, etc. Can be found in household products: rust removers, automotive detailing products, stain removers. #12;Hydrofluoric Acid Chemical
Introduction to M(atrix) theory and noncommutative geometry
A. Konechny; A. Schwarz
2001-07-29T23:59:59.000Z
Noncommutative geometry is based on an idea that an associative algebra can be regarded as "an algebra of functions on a noncommutative space". The major contribution to noncommutative geometry was made by A. Connes, who, in particular, analyzed Yang-Mills theories on noncommutative spaces, using important notions that were introduced in his papers (connection, Chern character, etc). It was found recently that Yang-Mills theories on noncommutative spaces appear naturally in string/M-theory; the notions and results of noncommutative geometry were applied very successfully to the problems of physics. In this paper we give a mostly self-contained review of some aspects of M(atrix) theory, of Connes' noncommutative geometry and of applications of noncommutative geometry to M(atrix) theory. The topics include introduction to BFSS and IKKT matrix models, compactifications on noncommutative tori, a review of basic notions of noncommutative geometry with a detailed discussion of noncommutative tori, Morita equivalence and $SO(d,d|{\\mathbb Z})$-duality, an elementary discussion of instantons and noncommutative orbifolds. The review is primarily intended for physicists who would like to learn some basic techniques of noncommutative geometry and how they can be applied in string theory and to mathematicians who would like to learn about some new problems arising in theoretical physics.
The causal structure of spacetime is a parameterized Randers geometry
Skakala, Jozef
2010-01-01T23:59:59.000Z
There is a by now well-established isomorphism between stationary 4-dimensional spacetimes and 3-dimensional purely spatial Randers geometries - these Randers geometries being a particular case of the more general class of 3-dimensional Finsler geometries. We point out that in stably causal spacetimes, by using the (time-dependent) ADM decomposition, this result can be extended to general non-stationary spacetimes - the causal structure (conformal structure) of the full spacetime is completely encoded in a parameterized (time-dependent) class of Randers spaces, which can then be used to define a Fermat principle, and also to reconstruct the null cones and causal structure.
Fay, James A.
1983-01-01T23:59:59.000Z
High concentrations of sulfuric and nitric acid in raTn fn the northeastern USA are caused by the large scale combustion of fossil fuels within this region. Average precipitation acidity is pH 4.2, but spatial and temporal ...
Shanklin, John; Cahoon, Edgar B.
2004-02-03T23:59:59.000Z
The present invention relates to a method for producing mutants of a fatty acid desaturase having a substantially increased activity towards fatty acid substrates with chains containing fewer than 18 carbons relative to an unmutagenized precursor desaturase having an 18 carbon atom chain length substrate specificity. The method involves inducing one or more mutations in the nucleic acid sequence encoding the precursor desaturase, transforming the mutated sequence into an unsaturated fatty acid auxotroph cell such as MH13 E. coli, culturing the cells in the absence of supplemental unsaturated fatty acids, thereby selecting for recipient cells which have received and which express a mutant fatty acid desaturase with an elevated specificity for fatty acid substrates having chain lengths of less than 18 carbon atoms. A variety of mutants having 16 or fewer carbon atom chain length substrate specificities are produced by this method. Mutant desaturases produced by this method can be introduced via expression vectors into prokaryotic and eukaryotic cells and can also be used in the production of transgenic plants which may be used to produce specific fatty acid products.
The Effects of Geometry on Flexible Duct CFD Simulations
Ugursal, A.; Culp, C.
2008-01-01T23:59:59.000Z
dynamics (CFD) simulations allow variable configurations and are emerging as an alternative to laboratory measurements. Issues with the CFD simulations of flexible ducts have been modeling the complex geometry and the computational requirements to complete...
Investigation of Created Fracture Geometry through Hydraulic Fracture Treatment Analysis
Ahmed, Ibraheem 1987-
2012-11-30T23:59:59.000Z
Successful development of shale gas reservoirs is highly dependent on hydraulic fracture treatments. Many questions remain in regards to the geometry of the created fractures. Production data analysis from some shale gas ...
Rheological control on the initial geometry of the Raft River...
Rheological control on the initial geometry of the Raft River detachment fault and shear zone, western United States Jump to: navigation, search OpenEI Reference LibraryAdd to...
Layer-by-layer assembly in confined geometries
DeRocher, Jonathan P
2011-01-01T23:59:59.000Z
The fundamental nature of layer-by-layer (LbL) assembly in confined geometries was investigated for a number of different chemical systems. The first part of this thesis concerns the modification of microfluidic and ...
A Simple, Fast Method of Estimating Fractured Reservoir Geometry...
from Tracer Tests Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: A Simple, Fast Method of Estimating Fractured Reservoir Geometry from Tracer...
Qubits from Adinkra Graph Theory via Colored Toric Geometry
Aadel, Y; Benslimane, Z; Sedra, M B; Segui, A
2015-01-01T23:59:59.000Z
We develop a new approach to deal with qubit information systems using toric geometry and its relation to Adinkra graph theory. More precisely, we link three different subjects namely toric geometry, Adinkras and quantum information theory. This one to one correspondence may be explored to attack qubit system problems using geometry considered as a powerful tool to understand modern physics including string theory. Concretely, we examine in some details the cases of one, two, and three qubits, and we find that they are associated with \\bf CP^1, \\bf CP^1\\times CP^1 and \\bf CP^1\\times CP^1\\times CP^1 toric varieties respectively. Using a geometric procedure referred to as colored toric geometry, we show that the qubit physics can be converted into a scenario handling toric data of such manifolds by help of Adinkra graph theory. Operations on toric information can produce universal quantum gates.
Control of Variable Geometry Turbocharged Diesel Engines for Reduced Emissions
Stefanopoulou, Anna
the turbine. A turbine with variable geometry uses inlet guide vanes (located on the turbine stator) to modify supplied by the compressor. This process is referred to as exhaust gas re- circulation (EGR). It is
Computer-assisted proofs in geometry and physics
Minton, Gregory T. (Gregory Thomas)
2013-01-01T23:59:59.000Z
In this dissertation we apply computer-assisted proof techniques to two problems, one in discrete geometry and one in celestial mechanics. Our main tool is an effective inverse function theorem which shows that, in favorable ...
Mechanical Equations on Bi-Para Conformal Geometry
Zeki Kasap; Mehmet Tekkoyun
2012-09-22T23:59:59.000Z
This study is an extented analogue to conformal geometry of the paper given by [14]. Also, the geometric and physical results related to bi-para-conformal-dynamical systems are also presented.
Review of `Principles of algebraic geometry' (Griffiths and Harris).pdf
publications whose sheer mass threatened to unbalance algebraic geometry. .... geometry is an impressive scholarly work, not only as a compendium of basic.
Searching for higher dimensional wormholes with noncommutative geometry
Farook Rahaman; P. K. F. Kuhfittig; Saibal Ray; Safiqul Islam
2012-11-29T23:59:59.000Z
Noncommutative geometry, an offshoot of string theory, replaces point-like structures with smeared objects and has recently been extended to higher dimensions. The purpose of this letter is to obtain wormhole solutions with this extended noncommutative geometry as a background. It is found through this investigation that wormhole solutions exist in the usual four, as well as in five dimensions, but they do not exist in higher-dimensional spacetimes.
Triangle geometry processing for surface modeling and cartesian grid generation
Aftosmis, Michael J. (San Mateo, CA) [San Mateo, CA; Melton, John E. (Hollister, CA) [Hollister, CA; Berger, Marsha J. (New York, NY) [New York, NY
2002-09-03T23:59:59.000Z
Cartesian mesh generation is accomplished for component based geometries, by intersecting components subject to mesh generation to extract wetted surfaces with a geometry engine using adaptive precision arithmetic in a system which automatically breaks ties with respect to geometric degeneracies. During volume mesh generation, intersected surface triangulations are received to enable mesh generation with cell division of an initially coarse grid. The hexagonal cells are resolved, preserving the ability to directionally divide cells which are locally well aligned.
Turk, Stacey N.
2010-01-14T23:59:59.000Z
We hypothesized that subcutaneous (s.c.) adipose tissue would differ in monounsaturated (MUFA) and saturated fatty acid (SFA) composition among different depots throughout a beef carcass. To test this, 50 carcasses from a variety of breed types...
Focus Sheet | Hydrofluoric Acid Health hazards of hydrofluoric acid
Wilcock, William
Focus Sheet | Hydrofluoric Acid Health hazards of hydrofluoric acid Hydrofluoric acid (HF characterized by weight loss, brittle bones, anemia, and general ill health. Safe use If possible, avoid working to exposures. #12;Focus Sheet | Hydrofluoric Acid Environmental Health and Safety Environmental Programs Office
Downstream Hydraulic Geometry of Alluvial Channels Jong-Seok Lee, A.M.ASCE1
Julien, Pierre Y.
Downstream Hydraulic Geometry of Alluvial Channels Jong-Seok Lee, A.M.ASCE1 ; and Pierre Y. Julien. A larger database for the downstream hydraulic geometry of alluvial channels is examined through with meandering to braided planform geometry. The five parameters describing downstream hydraulic geometry are
Extension of information geometry for modelling non-statistical systems
Ben Anthonis
2015-01-05T23:59:59.000Z
In this dissertation, an abstract formalism extending information geometry is introduced. This framework encompasses a broad range of modelling problems, including possible applications in machine learning and in the information theoretical foundations of quantum theory. Its purely geometrical foundations make no use of probability theory and very little assumptions about the data or the models are made. Starting only from a divergence function, a Riemannian geometrical structure consisting of a metric tensor and an affine connection is constructed and its properties are investigated. Also the relation to information geometry and in particular the geometry of exponential families of probability distributions is elucidated. It turns out this geometrical framework offers a straightforward way to determine whether or not a parametrised family of distributions can be written in exponential form. Apart from the main theoretical chapter, the dissertation also contains a chapter of examples illustrating the application of the formalism and its geometric properties, a brief introduction to differential geometry and a historical overview of the development of information geometry.
On Thermodynamics and Phase Space of Near Horizon Extremal Geometries
Hajian, Kamal
2015-01-01T23:59:59.000Z
Near Horizon Extremal Geometries (NHEG), are geometries which may appear in the near horizon region of the extremal black holes. These geometries have $SL(2,\\mathbb{R})\\!\\times\\!U(1)^n$ isometry, and constitute a family of solutions to the theory under consideration. In the first part of this report, their thermodynamic properties are reviewed, and their three universal laws are derived. In addition, at the end of the first part, the role of these laws in black hole thermodynamics is presented. In the second part of this thesis, we review building their classical phase space in the Einstein-Hilbert theory. The elements in the NHEG phase space manifold are built by appropriately chosen coordinate transformations of the original metric. These coordinate transformations are generated by some vector fields, dubbed "symplectic symmetry generators." To fully specify the phase space, we also need to identify the symplectic structure. In order to fix the symplectic structure, we use the formulation of Covariant Phase...
Thermodynamic geometry of charged rotating BTZ black holes
Akbar, M. [Center for Advanced Mathematics and Physics, National University of Sciences and Technology, H-12, Islamabad (Pakistan); Quevedo, H. [Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, AP 70543, Mexico, DF 04510 (Mexico); ICRANet, Dipartimento di Fisica, Universita di Roma La Sapienza, I-00185 Roma (Italy); Saifullah, K. [Department of Mathematics, Quaid-i-Azam University, Islamabad (Pakistan); Sanchez, A. [Departamento de Posgrado, CIIDET, AP 752, Queretaro, QRO 76000 (Mexico); Taj, S. [Center for Advanced Mathematics and Physics, National University of Sciences and Technology, H-12, Islamabad (Pakistan); ICRANet, Dipartimento di Fisica, Universita di Roma La Sapienza, I-00185 Roma (Italy)
2011-04-15T23:59:59.000Z
We study the thermodynamics and the thermodynamic geometries of charged rotating Banados-Teitelboim-Zanelli black holes in (2+1)-gravity. We investigate the thermodynamics of these systems within the context of the Weinhold and Ruppeiner thermodynamic geometries and the recently developed formalism of geometrothermodynamics. Considering the behavior of the heat capacity and the Hawking temperature, we show that Weinhold and Ruppeiner geometries cannot describe completely the thermodynamics of these black holes and of their limiting case of vanishing electric charge. In contrast, the Legendre invariance imposed on the metric in geometrothermodynamics allows one to describe the charged rotating Banados-Teitelboim-Zanelli black holes and their limiting cases in a consistent and invariant manner.
Nontrivial Geometries: Bounds on the Curvature of the Universe
Laura Mersini-Houghton; Yun Wang; Pia Mukherjee; Ervin Kafexhiu
2007-05-02T23:59:59.000Z
Probing the geometry of the universe is one of the most important endevours in cosmology. Current observational data from the Cosmic Microwave Background anisotropy (CMB), galaxy surveys and type Ia supernovae (SNe Ia) strongly constrain the curvature of the universe to be close to zero for a universe dominated by a cosmological constant or dark energy with a constant equation of state. Here we investigate the role of cosmic priors on deriving these tight bounds on geometry, by considering a landscape motivated scenario with an oscillating curvature term. We perform a likelihood analysis of current data under such a model of non-trivial geometry and find that the uncertainties on curvature, and correspondingly on parameters of the matter and dark energy sectors, are larger. Future dark energy experiments together with CMB data from experiments like Planck could dramatically improve our ability to constrain cosmic curvature under such models enabling us to probe possible imprints of quantum gravity.
Torsional Newton-Cartan Geometry and Lifshitz Holography
Morten H. Christensen; Jelle Hartong; Niels A. Obers; Blaise Rollier
2014-09-19T23:59:59.000Z
We obtain the Lifshitz UV completion in a specific model for z=2 Lifshitz geometries. We use a vielbein formalism which enables identification of all the sources as leading components of well-chosen bulk fields. We show that the geometry induced from the bulk onto the boundary is a novel extension of Newton-Cartan geometry with a specific torsion tensor. We explicitly compute all the vevs including the boundary stress-energy tensor and their Ward identities. After using local symmetries/Ward identities the system exhibits 6+6 sources and vevs. The FG expansion exhibits, however, an additional free function which is related to an irrelevant operator whose source has been turned off. We show that this is related to a second UV completion.
Optical reference geometry of the Kerr-Newman spacetimes
Zden?k Stuchlík; Stanislav Hledík; Josef Jurá?
2008-03-17T23:59:59.000Z
Properties of the optical reference geometry related to Kerr-Newman black-hole and naked-singularity spacetimes are illustrated using embedding diagrams of their equatorial plane. Among all inertial forces defined in the framework of the optical geometry, just the centrifugal force plays a fundamental role in connection to the embedding diagrams because it changes sign at the turning points of the diagrams. The limits of embeddability are given, and it is established which of the photon circular orbits hosted the by Kerr-Newman spacetimes appear in the embeddable regions. Some typical embedding diagrams are constructed, and the Kerr-Newman backgrounds are classified according to the number of embeddable regions of the optical geometry as well as the number of their turning points. Embedding diagrams are closely related to the notion of the radius of gyration which is useful for analyzing fluid rotating in strong gravitational fields.
Selection of regenerator geometry for magnetic refrigerator applications
Barclay, J.A.; Sarangi, S.
1984-01-01T23:59:59.000Z
In our effort to develop magnetic regenerators of high efficiency we have looked at the following geometries: (1) tube channels in solid block; (2) stack of perforated plates normal to the fluid flow direction; (3) stack of solid plates parallel to fluid flow direction, and packed bed of spherical particles; (4) loose packed; and (5) sintered. Reported are computations of the overall efficiency of the regenerator, considering heat transfer, longitudinal conduction, and fluid pressure drop, for all the above arrangements as a function of geometrical variables, such as overall length and particle diameter or plate thickness. The results yield the optimum geometry for a given combination of other controlling parameters, such as frequency, porosity, and fluid properties. The different geometries are compared under the constraint that the mass of magnetic material is the same for all. This condition is peculiar to the magnetic refrigeration process because the net refrigeration and driving forces are proportional to the mass of magnetic material.
Jorgensen, B.S.; Nekimken, H.L.; Carey, W.P.; O`Rourke, P.E.
1997-07-22T23:59:59.000Z
An apparatus and method for determining acid concentrations in solutions having acid concentrations of from about 0.1 Molar to about 16 Molar is disclosed. The apparatus includes a chamber for interrogation of the sample solution, a fiber optic light source for passing light transversely through the chamber, a fiber optic collector for receiving the collimated light after transmission through the chamber, a coating of an acid resistant polymeric composition upon at least one fiber end or lens, the polymeric composition in contact with the sample solution within the chamber and having a detectable response to acid concentrations within the range of from about 0.1 Molar to about 16 Molar, a measurer for the response of the polymeric composition in contact with the sample solution, and a comparer of the measured response to predetermined standards whereby the acid molarity of the sample solution within the chamber can be determined. Preferably, a first lens is attached to the end of the fiber optic light source, the first lens adapted to collimate light from the fiber optic light source, and a second lens is attached to the end of the fiber optic collector for focusing the collimated light after transmission through the chamber. 10 figs.
Controlling Electromagnetic Fields at Boundaries of Arbitrary Geometries
Teo, Jonathon Yi Han; Molardi, Carlo; Genevet, Patrice
2015-01-01T23:59:59.000Z
Rapid developments in the emerging field of stretchable and conformable photonics necessitate analytical expressions for boundary conditions at metasurfaces of arbitrary geometries. Here, we introduce the concept of conformal boundary optics: a design theory that determines the optical response for designer input and output fields at such interfaces. Given any object, we can realise coatings to achieve exotic effects like optical illusions and anomalous diffraction behaviour. This approach is relevant to a broad range of applications from conventional refractive optics to the design of the next-generation of wearable optical components. This concept can be generalized to other fields of research where designer interfaces with nontrivial geometries are encountered.
Stability of Einstein Static Universe over Lyra Geometry
F. Darabi; Y. Heydarzade; F. Hajkarim
2014-06-30T23:59:59.000Z
The existence and stability conditions of Einstein static universe against homogeneous scalar perturbations in the context of Lyra geometry is investigated. The stability condition is obtained in terms of the constant equation of state parameter $\\omega=p/\\rho$ depending on energy density $\\rho_0$ and scale factor $a_0$ of the initial Einstein static universe. Also, the stability against vector and tensor perturbations is studied. It is shown that a stable Einstein static universe can be found in the context of Lyra geometry against scalar, vector and tensor perturbations for suitable range and values of physical parameters.
Distributional energy momentum tensor of the extended Kerr geometry
H. Balasin
1997-02-27T23:59:59.000Z
We generalize previous work on the energy-momentum tensor-distribution of the Kerr geometry by extending the manifold structure into the negative mass region. Since the extension of the flat part of the Kerr-Schild decomposition from one sheet to the double cover develops a singularity at the branch surface we have to take its non-smoothness into account. It is however possible to find a geometry within the generalized Kerr-Schild class that is in the Colombeau-sense associated to the maximally analytic Kerr-metric.
From Special Geometry to Black Hole Partition Functions
Thomas Mohaupt
2008-12-22T23:59:59.000Z
These notes are based on lectures given at the Erwin-Schrodinger Insitut in Vienna in 2006/07 and at the 2007 School on Attractor Mechanism in Frascati. Lecture I: special geometry from the superconformal point of view. Lecture II: black hole attractor mechanism, its underlying variational principle, and black hole partition functions. Lecture III: large and small BPS black holes in N=4 supergravity. Lecture IV: state counting for N=4 string compactifications. Appendix A: special geometry from the mathematical point of view. Appendix B: review of modular forms. Contains four problems which allow the readers to develop some of the key concepts by themselves.
On the material geometry of continuously defective corrugated graphene sheets
Andrzej Trzesowski
2014-12-22T23:59:59.000Z
Geometrical objects describing the material geometry of continuously defective graphene sheets are introduced and their compatibility conditions are formulated. Effective edge dislocations embedded in the Riemann-Cartan material space and defined by their scalar density and by local Burgers vectors, are considered. The case of secondary curvature-type defects created by this distribution of dislocations is analysed in terms of the material space. The variational geometry of the material space closely related with the existence of a characteristic length parameter is proposed. The formula which describes, in a reference temperature, the influence of dislocations on the material Riemannian metric, is given.
On the isothermal geometry of corrugated graphene sheets
Andrzej Trzesowski
2014-12-22T23:59:59.000Z
Variational geometries describing corrugated graphene sheets are proposed. The isothermal thermomechanical properties of these sheets are described by a 2-dimensional Weyl space. The equation that couples the Weyl geometry with isothermal distributions of the temperature of graphene sheets, is formulated. This material space is observed in a 3-dimensional orthogonal configurational point space as regular surfaces which are endowed with a thermal state vector field fulfilling the isothermal thermal state equation. It enables to introduce a non-topological dimensionless thermal shape parameter of non-developable graphene sheets. The properties of the congruence of lines generated by the thermal state vector field are discussed.
Arceo, Elena; Ellman, Jonathan; Bergman, Robert
2010-05-03T23:59:59.000Z
An alternative biomass-based route to benzoic acid from the renewable starting materials quinic acid and shikimic acid is described. Benzoic acid is obtained selectively using a highly efficient, one-step formic acid-mediated deoxygenation method.
Synthesis of acid addition salt of delta-aminolevulinic acid from 5-bromo levulinic acid esters
Moens, Luc (Lakewood, CO)
2003-06-24T23:59:59.000Z
A process of preparing an acid addition salt of delta-aminolevulinc acid comprising: a) dissolving a lower alkyl 5-bromolevulinate and hexamethylenetetramine in a solvent selected from the group consisting of water, ethyl acetate, chloroform, acetone, ethanol, tetrahydrofuran and acetonitrile, to form a quaternary ammonium salt of the lower alkyl 5-bromolevulinate; and b) hydrolyzing the quaternary ammonium salt with an inorganic acid to form an acid addition salt of delta-aminolevulinic acid.
Volumetric Geometry Reconstruction of Turbine Blades for Aircraft Engines
Jüttler, Bert
Volumetric Geometry Reconstruction of Turbine Blades for Aircraft Engines David Großmann1 and Bert-spline parametrization of turbine blades from measurement data generated by optical scanners. This new representation elements. We focus on the industrial applicability of the framework, by using standard turbine blade
FOURTH ORDER PARTIAL DIFFERENTIAL EQUATIONS ON GENERAL GEOMETRIES
FOURTH ORDER PARTIAL DIFFERENTIAL EQUATIONS ON GENERAL GEOMETRIES By John B. Greer Andrea L0436 Phone: 612/624-6066 Fax: 612/626-7370 URL: http://www.ima.umn.edu #12;Fourth Order Partial Differential (Bertalm´io, Cheng, Osher, and Sapiro 2001) to fourth order PDEs including the Cahn- Hilliard equation
A Brain-Switch using Riemannian Geometry A. Barachant1
Paris-Sud XI, Université de
A Brain-Switch using Riemannian Geometry A. Barachant1 , S. Bonnet1 , M. Congedo2 , C. Jutten2 1 the issue of asynchronous brain-switch. The detection of a specific brain pattern from the ongoing EEG-time EEG segments contain all the desired information. Such a brain-switch is valuable as it is easy to set
Emergence of Time from Dimensional Reduction in Noncommutative Geometry
Chong-Sun Chu; Olaf Lechtenfeld
2006-01-19T23:59:59.000Z
By considering a new form of dimensional reduction for noncommutative field theory, we show that the signature of spacetime may be changed. In particular, it is demonstrated that a temporal dimension can emerge from a purely Euclidean geometry. We suggest that this mechanism may hint at the origin of time in the fundamental theory of quantum gravity.
J. ALGEBRAIC GEOMETRY 00 (XXXX) 000-000
Némethi, András
J. ALGEBRAIC GEOMETRY 00 (XXXX) 000-000 S 1056-3911(XX)0000-0 THE DEGREE algebraic group, and let ae : G ! GL(V ) be an irreducible algebraic representation. Then ae induces [?], Lascoux [?], Boole, Tevelev [?], Gelfand-Kapranov-Zelevinsky [?, Ch.13,14], see a summary in [?, Ch.7
The Siwaliks of western Nepal I. Geometry and kinematics
Husson, Laurent
The Siwaliks of western Nepal I. Geometry and kinematics J.L. Mugniera, *, P. Leturmya , G. Masclea-western Nepal, and beneath 14.6 Ma sediments in mid-western Nepal, i.e., above the base of the Siwalik Group. Unconformities have been observed in the upper Siwalik member of western Nepal both on satellite images
Second order variational problem and 2-dimensional concircular geometry
Matsyuk, Roman
2014-01-01T23:59:59.000Z
It is proved that the set of geodesic circles in two dimensions may be given a variational description and the explicit form of it is presented. In the limit case of the Euclidean geometry a certain claim of uniqueness of such description is proved. A formal notion of 'spin' force is discovered as a by-product of the variation procedure involving the acceleration.
Tropical geometry of statistical models Lior Pachter and Bernd Sturmfels
Marcolli, Matilde
for graphical models in statistical learning theory (5), but it differs from other (more classical) notionsTropical geometry of statistical models Lior Pachter and Bernd Sturmfels Department of Mathematics, University of California, Berkeley, CA 94720 Communicated by Stephen E. Fienberg, Carnegie Mellon University
Propagation of gravitons in the shock wave geometry
Lang, Ruitian
2009-01-01T23:59:59.000Z
In this thesis, I study propagation of gravitons in the shock wave geometry in the context of the AdS/CFT correspondence, with the goal to uncover some constraint on the supergravity action in the AdS space. In studying ...
The Geometry of Uncertainty in Moving Objects Databases
Wolfson, Ouri E.
The Geometry of Uncertainty in Moving Objects Databases Goce Trajcevski1 , Ouri Wolfson1@arl.mil Abstract. This work addresses the problem of querying moving ob- jects databases. which capture- ing, constructing, and querying a trajectories database. We propose to model a trajectory as a 3D
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
Clay Mathematics Proceedings Noncommutative Geometry and Number Theory
Tretkoff, Paula
Clay Mathematics Proceedings Noncommutative Geometry and Number Theory Paula B. Cohen Introduction of the Riemann Hypothesis, from which we quote several times, is given by Enrico Bombieri on the Clay Mathematics Mathematics Subject Classification 11J06, 58B34. The author acknowledges support from the Clay Foundation. c
ON LOCAL GEOMETRY OF VECTOR DISTRIBUTIONS WITH GIVEN JACOBI SYMBOLS
Zelenko, Igor
ON LOCAL GEOMETRY OF VECTOR DISTRIBUTIONS WITH GIVEN JACOBI SYMBOLS BORIS DOUBROV AND IGOR ZELENKO generating distribution, the Jacobi symbol. In contrast to the classical Tanaka symbol, the set of Jacobi Jacobi symbol. We describe all Jacobi symbols for which this procedure ends up in a finite number
Adhesion and the Geometry of the Cosmic Web
Johan Hidding; Rien van de Weygaert; Gert Vegter; Bernard J. T. Jones
2012-11-22T23:59:59.000Z
We present a new way to formulate the geometry of the Cosmic Web in terms of Lagrangian space. The Adhesion model has an ingenious geometric interpretation out of which the spine of the Cosmic Web emerges naturally. Within this context we demonstrate a deep connection of the relation between Eulerian and Lagrangian space with that between Voronoi and Delaunay tessellations.
Geometry and Optimal Packing of Twisted Columns and Filaments
Gregory M. Grason
2015-01-30T23:59:59.000Z
This review presents recent progress in understanding constraints and consequences of close-packing geometry of filamentous or columnar materials possessing non-trivial textures, focusing in particular on the common motifs of twisted and toroidal structures. The mathematical framework is presented that relates spacing between line-like, filamentous elements to their backbone orientations, highlighting the explicit connection between the inter-filament {\\it metric} properties and the geometry of non-Euclidean surfaces. The consequences of the hidden connection between packing in twisted filament bundles and packing on positively curved surfaces, like the Thomson problem, are demonstrated for the defect-riddled ground states of physical models of twisted filament bundles. The connection between the "ideal" geometry of {\\it fibrations} of curved three-dimensional space, including the Hopf fibration, and the non-Euclidean constraints of filament packing in twisted and toroidal bundles is presented, with a focus on the broader dependence of metric geometry on the simultaneous twisting and folded of multi-filament bundles.
Mathematical features of Whitehead's point-free geometry
Gerla, Giangiacomo
1 Mathematical features of Whitehead's point- free geometry In HANDBOOK OF WHITEHEADIAN PROCESS quote computability theory, lat- tice theory, computer science. Now, the basic ideas of point over' and is the symbol for the fundamental relation of extension." Moreover, Whitehead in PNK lists
Modelling and geometry optimisation of wave energy converters
Nørvåg, Kjetil
Modelling and geometry optimisation of wave energy converters Adi Kurniawan Supervisors: Prof;Research questions Modelling How to develop more realistic wave energy converter (WEC) models while wave energy converter (WEC) models while at the same time reduce their simulation time? Optimisation
Optical geometry analysis of the electromagnetic self-force
Sebastiano Sonego; Marek A. Abramowicz
2006-02-17T23:59:59.000Z
We present an analysis of the behaviour of the electromagnetic self-force for charged particles in a conformally static spacetime, interpreting the results with the help of optical geometry. Some conditions for the vanishing of the local terms in the self-force are derived and discussed.
Generalized exterior forms, geometry and P Nurowski D C Robinson
Bushnell, Colin J.
Generalized exterior forms, geometry and space-time P Nurowski D C Robinson Instytut Fizyki of a generalized exterior algebras and calculi of p-forms, will be presented. This type of extension an abstract twistor structure with any real analytic Einstein space- time, [1-4]. However it is clear
Vibration Enhances Geometry Perception with Tactile Shape Displays Mara Oyarzbal *
Tachi, Susumu
Vibration Enhances Geometry Perception with Tactile Shape Displays María Oyarzábal * Masashi, but little is known about the effects of vibrating displayed shapes. This study examines passive touch, but it was readily detected when the pattern was vibrated at 5 Hz. A central raised bar was incorrectly perceived
Vacuum Calculations in Azimuthally Symmetric Geometry \\Lambda M. S. Chance
Vacuum Calculations in Azimuthally Symmetric Geometry \\Lambda M. S. Chance Princeton University the volume integrated perturbed magnetic energy in the vacuum region or through the continuity requirements plasmavacuum boundary. The method is based upon using Green's second identity and the method
Vacuum Calculations in Azimuthally Symmetric Geometry M. S. Chance
Vacuum Calculations in Azimuthally Symmetric Geometry M. S. Chance Princeton University Plasma energy in the vacuum region or through the continuity requirements for the normal component of the perturbed magnetic #12;eld and the total perturbed pressure across the unperturbed plasma-vacuum boundary
Representation Theory, Geometry & Combinatorics Organizer: M. Haiman and N. Reshetikhin
Haiman, Mark D.
Representation Theory, Geometry & Combinatorics Seminar Organizer: M. Haiman and N. Reshetikhin Wednesday, 4:00Â6:00pm, 939 Evans Apr. 14 Ivan Shestakov, IME-USP, S~ao Paolo Nonassociative Lie Theory The theory of Lie algebras is one of the corner-stones of modern mathematics and physics. They usually relate
Representation Theory, Geometry & Combinatorics Organizer: M. Haiman and N. Reshetikhin
Haiman, Mark D.
Representation Theory, Geometry & Combinatorics Seminar Organizer: M. Haiman and N. Reshetikhin course: Representation theory and the X-ray transform The X-ray transform (also called the Funk transform tools from complex analysis and the representation theory of Lie groups. Lecture 1: Differential
NANOFLARE STATISTICS FROM FIRST PRINCIPLES: FRACTAL GEOMETRY AND TEMPERATURE SYNTHESIS
Parnell, Clare E.
of nanoflares in a quiet-Sun region covering a comprehensive temperature range of Te % 1 4 MK. We detected. We synthesize the temperature-biased frequency distributions from each wavelength and findNANOFLARE STATISTICS FROM FIRST PRINCIPLES: FRACTAL GEOMETRY AND TEMPERATURE SYNTHESIS Markus J
Geometry & Topology 18 (2014) 20792126 Realisation and dismantlability
Przytycki, Piotr
2014-01-01T23:59:59.000Z
msp Geometry & Topology 18 (2014) 20792126 Realisation and dismantlability SEBASTIAN HENSEL DAMIAN OSAJDA PIOTR PRZYTYCKI We prove that a finite group acting on an infinite graph with dismantling is contractible. We study dismantling properties of the arc, disc and sphere graphs. We apply our theory to prove
Laser Autogenous Brazing of Biocompatible, Dissimilar Metals in Tubular Geometries
Yao, Y. Lawrence
Laser Autogenous Brazing of Biocompatible, Dissimilar Metals in Tubular Geometries Gen Satoh, Grant that are unsuitable for use within the human body. This study investigates a new process, Laser Autogenous Brazing Laser Welding, Joining, Brazing, NiTi, Shape Memory, Stainless Steel, Autogenous Laser Brazing
Somerville, Chris (Portola Valley, CA); van de Loo, Frank (Lexington, KY)
2000-01-01T23:59:59.000Z
The present invention relates to the identification of nucleic acid sequences and constructs, and methods related thereto, and the use of these sequences and constructs to produce genetically modified plants for the purpose of altering the composition of plant oils, waxes and related compounds.
Acid placement and coverage in the acid jetting process
Mikhailov, Miroslav I.
2009-05-15T23:59:59.000Z
Many open-hole acid treatments are being conducted by pumping acid through jetting ports placed at the end of coiled tubing or drill pipe. The filter-cake on the bore-hole is broken by the jet; the acid-soluble material is dissolved, creating...
Acid placement and coverage in the acid jetting process
Mikhailov, Miroslav I.
2009-05-15T23:59:59.000Z
Many open-hole acid treatments are being conducted by pumping acid through jetting ports placed at the end of coiled tubing or drill pipe. The filter-cake on the bore-hole is broken by the jet; the acid-soluble material is dissolved, creating...
Lubrication with boric acid additives
Erdemir, Ali (Naperville, IL)
2000-01-01T23:59:59.000Z
Self-lubricating resin compositions including a boric acid additive and a synthetic polymer including those thermoset materials.
Oxidation of ferrocene by thiocyanic acid in the presence of ammonium oxalate
Ruslin, Farah bt; Yamin, Bohari M. [School of Chemical Science and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (Malaysia)
2014-09-03T23:59:59.000Z
A flake-like crystalline salt was obtained from the reaction of ferrocene, oxalic acid and ammonium thiocyanate in ethanol The elemental analysis and spectroscopic data were in agreement with the preliminary X-ray molecular structure. The compound consists of four ferrocenium moieties and a counter anion consisting of two (tetraisothiocyanato)iron(III) linked by an oxalato bridging group in such a way that both iron central atoms adopt octahedral geometries.
Carboxylic acid sorption regeneration process
King, C.J.; Poole, L.J.
1995-05-02T23:59:59.000Z
Carboxylic acids are sorbed from aqueous feedstocks into an organic liquid phase or onto a solid adsorbent. The acids are freed from the sorbent phase by treating it with aqueous alkylamine thus forming an alkylammonium carboxylate which is dewatered and decomposed to the desired carboxylic acid and the alkylamine. 10 figs.
Pantothenic acid biosynthesis in zymomonas
Tao, Luan; Tomb, Jean-Francois; Viitanen, Paul V.
2014-07-01T23:59:59.000Z
Zymomonas is unable to synthesize pantothenic acid and requires this essential vitamin in growth medium. Zymomonas strains transformed with an operon for expression of 2-dehydropantoate reductase and aspartate 1-decarboxylase were able to grow in medium lacking pantothenic acid. These strains may be used for ethanol production without pantothenic acid supplementation in seed culture and fermentation media.
How effective is graphene nanopore geometry on DNA sequencing?
Satarifard, Vahid; Ejtehadi, Mohammad Reza
2015-01-01T23:59:59.000Z
In this paper we investigate the effects of graphene nanopore geometry on homopolymer ssDNA pulling process through nanopore using steered molecular dynamic (SMD) simulations. Different graphene nanopores are examined including axially symmetric and asymmetric monolayer graphene nanopores as well as five layer graphene polyhedral crystals (GPC). The pulling force profile, moving fashion of ssDNA, work done in irreversible DNA pulling and orientations of DNA bases near the nanopore are assessed. Simulation results demonstrate the strong effect of the pore shape as well as geometrical symmetry on free energy barrier, orientations and dynamic of DNA translocation through graphene nanopore. Our study proposes that the symmetric circular geometry of monolayer graphene nanopore with high pulling velocity can be used for DNA sequencing.
Experimental study of flame propagation in semiconfined geometries with obstacles
Urtiew, P.A.; Brandeis, J.; Hogan, W.J.
1982-02-08T23:59:59.000Z
Accidents in which large quantities of liquefied natural gas (LNG) or other combustible materials are spilled can potentially lead to disastrous consequences, especially if the dispersing combustible cloud finds a suitable ignition source. So far, very little is known about the detailed behavior of a large burning cloud. Full-scale experiments are economically prohibitive, and therefore one must rely on laboratory and field experiments of smaller size, scaling up the results to make predictions about larger spill accidents. In this paper we describe our laboratory-scale experiments with a combustible propane/air mixture in various partially confined geometries. We summarize the experimental results and compare them with calculated results based on numerical simulations of the experiments. Our observations suggest that the geometry of the partial confinement is of primary importance; turbulence-producing obstacles can cause acceleration in the flame front and, more important, can cause a faster burnout of the combustible vapor.
Gravitational waves in the spectral action of noncommutative geometry
Nelson, William; Ochoa, Joseph; Sakellariadou, Mairi [Institute of Gravitation and the Cosmos, Penn State University, State College, Pennsylvania 16801 (United States); Department of Physics, King's College, University of London, Strand WC2R 2LS, London (United Kingdom)
2010-10-15T23:59:59.000Z
The spectral triple approach to noncommutative geometry allows one to develop the entire standard model (and supersymmetric extensions) of particle physics from a purely geometry standpoint and thus treats both gravity and particle physics on the same footing. The bosonic sector of the theory contains a modification to Einstein-Hilbert gravity, involving a nonconformal coupling of curvature to the Higgs field and conformal Weyl term (in addition to a nondynamical topological term). In this paper we derive the weak-field limit of this gravitational theory and show that the production and dynamics of gravitational waves are significantly altered. In particular, we show that the graviton contains a massive mode that alters the energy lost to gravitational radiation, in systems with evolving quadrupole moment. We explicitly calculate the general solution and apply it to systems with periodically varying quadrupole moments, focusing, in particular, on the well-known energy loss formula for circular binaries.
Collective neutrino oscillations in non-spherical geometry
Basudeb Dasgupta; Amol Dighe; Alessandro Mirizzi; Georg G. Raffelt
2008-05-21T23:59:59.000Z
The rich phenomenology of collective neutrino oscillations has been studied only in one-dimensional or spherically symmetric systems. Motivated by the non-spherical example of coalescing neutron stars, presumably the central engines of short gamma-ray bursts, we use the Liouville equation to formulate the problem for general source geometries. Assuming the neutrino ensemble displays self-maintained coherence, the problem once more becomes effectively one-dimensional along the streamlines of the overall neutrino flux. This approach for the first time provides a formal definition of the ``single-angle approximation'' frequently used for supernova neutrinos and allows for a natural generalization to non-spherical geometries. We study the explicit example of a disk-shaped source as a proxy for coalescing neutron stars.
Magnetic Field Geometry in "Red" and "Blue" BL Lacs
P. Kharb; D. C. Gabuzda; P. Shastri
2003-01-06T23:59:59.000Z
We compare the systematics of the magnetic field geometry in the "red" low-energy peaked BL Lacs (LBLs) and "blue" high-energy peaked BL Lacs (HBLs) using VLBI polarimetric images. The LBLs are primarily "radio--selected" BL Lacs and the HBLs are primarily "X-ray selected". In contrast to the LBLs, which show predominantly transverse jet magnetic fields, the HBLs show predominantly longitudinal fields. Thus, while the SED peaks of core-dominated quasars, LBLs and HBLs form a sequence of increasing frequency, the magnetic field geometry does not follow an analogous sequence. We briefly investigate possible connections between the observed parsec-scale magnetic field structures and circular polarization measurements in the literature on various spatial scales.
Existence and unicity of co-moments in multisymplectic geometry
Leonid Ryvkin; Tilmann Wurzbacher
2014-11-09T23:59:59.000Z
Given a multisymplectic manifold $(M,\\omega)$ and a Lie algebra $\\frak{g}$ acting on it by infinitesimal symmetries, Fregier-Rogers-Zambon define a homotopy (co-)moment as an $L_{\\infty}$-algebra-homomorphism from $\\frak{g}$ to the observable algebra $L(M,\\omega)$ associated to $(M,\\omega)$, in analogy with and generalizing the notion of a co-moment map in symplectic geometry. We give a cohomological characterization of existence and unicity for homotopy co-moment maps and show its utility in multisymplectic geometry by applying it to special cases as exact multisymplectic manifolds and simple Lie groups and by deriving from it existence results concerning partial co-moment maps, as e.g. covariant multimomentum maps and multi-moment maps.
Composition for nucleic acid sequencing
Korlach, Jonas (Ithaca, NY); Webb, Watt W. (Ithaca, NY); Levene, Michael (Ithaca, NY); Turner, Stephen (Ithaca, NY); Craighead, Harold G. (Ithaca, NY); Foquet, Mathieu (Ithaca, NY)
2008-08-26T23:59:59.000Z
The present invention is directed to a method of sequencing a target nucleic acid molecule having a plurality of bases. In its principle, the temporal order of base additions during the polymerization reaction is measured on a molecule of nucleic acid, i.e. the activity of a nucleic acid polymerizing enzyme on the template nucleic acid molecule to be sequenced is followed in real time. The sequence is deduced by identifying which base is being incorporated into the growing complementary strand of the target nucleic acid by the catalytic activity of the nucleic acid polymerizing enzyme at each step in the sequence of base additions. A polymerase on the target nucleic acid molecule complex is provided in a position suitable to move along the target nucleic acid molecule and extend the oligonucleotide primer at an active site. A plurality of labelled types of nucleotide analogs are provided proximate to the active site, with each distinguishable type of nucleotide analog being complementary to a different nucleotide in the target nucleic acid sequence. The growing nucleic acid strand is extended by using the polymerase to add a nucleotide analog to the nucleic acid strand at the active site, where the nucleotide analog being added is complementary to the nucleotide of the target nucleic acid at the active site. The nucleotide analog added to the oligonucleotide primer as a result of the polymerizing step is identified. The steps of providing labelled nucleotide analogs, polymerizing the growing nucleic acid strand, and identifying the added nucleotide analog are repeated so that the nucleic acid strand is further extended and the sequence of the target nucleic acid is determined.
New embedding of Schwarzschild geometry. II. Interior solution
R. Burghardt
2002-03-01T23:59:59.000Z
We embed the Schwarzschild interior solution in a five-dimensional flat space and show that the systems of the interior and the exterior solution are based on the same geometrical principles. It turns out that the energy tensor of the matter has its origin in the five-dimensional structure of the geometry and is built up by the generalized second fundamental forms. Thus, the matter is already geometrized. The Codazzi equations are the field equations for the matter field.
Emergent geometry in N=6 Chern-Simons-matter theory
Diego Trancanelli
2009-05-13T23:59:59.000Z
We investigate a strong coupling expansion of N=6 superconformal Chern-Simons theory obtained from the semiclassical analysis of low energy, effective degrees of freedom given by the eigenvalues of a certain matrix model. We show how the orbifolded sphere S^7/Z_k of the dual geometry emerges dynamically from the distribution of the eigenvalues. As a test of this approach we compute the energy of off-diagonal excitations, finding perfect agreement with the dispersion relation of giant magnons.
Simulating gyrokinetic microinstabilities in stellarator geometry with GS2
Baumgaertel, J. A.; Guttenfelder, W.; Hammett, G. W.; Mikkelsen, D. R.; Rewoldt, G.; Tang, W. M. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Belli, E. A. [General Atomics, San Diego, California 92186 (United States); Dorland, W. [Department of Physics, University of Maryland, College Park, Maryland 20742 (United States); Xanthopoulos, P. [Max-Planck-Institut fuer Plasmaphysik, D-17491 Greifswald (Germany)
2011-12-15T23:59:59.000Z
The nonlinear gyrokinetic code GS2 has been extended to treat non-axisymmetric stellarator geometry. Electromagnetic perturbations and multiple trapped particle regions are allowed. Here, linear, collisionless, electrostatic simulations of the quasi-axisymmetric, three-field period national compact stellarator experiment (NCSX) design QAS3-C82 have been successfully benchmarked against the eigenvalue code FULL. Quantitatively, the linear stability calculations of GS2 and FULL agree to within {approx}10%.
Teleparallel Lagrange Geometry and a Unified Field Theory
M. I. Wanas; Nabil L. Youssef; A. M. Sid-Ahmed
2010-02-13T23:59:59.000Z
In this paper, we construct a field theory unifying gravity and electromagnetism in the context of Extended Absolute Parallelism (EAP-) geometry. This geometry combines, within its structure, the geometric richness of the tangent bundle and the mathematical simplicity of Absolute Parallelism (AP-) geometry. The constructed field theory is a generalization of the Generalized Field Theory (GFT) formulated by Mikhail and Wanas. The theory obtained is purely geometric. The horizontal (resp. vertical) field equations are derived by applying the Euler-Lagrange equations to an appropriate horizontal (resp. vertical) scalar Lagrangian. The symmetric part of the resulting horizontal (resp. vertical) field equations gives rise to a generalized form of Einstein's field equations in which the horizontal (resp. vertical) energy-momentum tensor is purely geometric. The skew-symmetric part of the resulting horizontal (resp. vertical) field equations gives rise to a generalized form of Maxwell equations in which the electromagnetic field is purely geometric. Some interesting special cases, which reveal the role of the nonlinear connection in the obtained field equations, are examined. Finally, the condition under which our constructed field equations reduce to the GFT is explicitly established.
Quintessence and effective AdS brane geometries
K. Priyabrat Pandey; Abhishek K. Singh; Sunita Singh; Supriya Kar
2014-07-25T23:59:59.000Z
A geometric torsion dynamics leading to an effective curvature in a second order formalism on a D4-brane is revisited with a renewed interest. We obtain two effective $AdS_4$ brane geometries on a vacuum created pair of $(D{\\bar D})_3$-brane. One of them is shown to describe an AdS Schwarzschild spinning black hole and the other is shown to describe a spinning black hole bound state. It is argued that a D-instanton in a vacuum created anti D3-brane within a pair may describe a quintessence. It may seen to incorporate a varying vacuum energy density in a brane universe. We consider the effective curvature scalar on $S^1\\times S^1$ to analyze torsion-less geometries on a vacuum created pair of $(D{\\bar D})_2$-brane. The emergent $AdS_3$ brane is shown to describe a Schwarzschild and a Reissner-Nordstrom (RN) geometries in presence of extra dimension(s).
Invasive cleavage of nucleic acids
Prudent, James R. (Madison, WI); Hall, Jeff G. (Madison, WI); Lyamichev, Victor I. (Madison, WI); Brow, Mary Ann D. (Madison, WI); Dahlberg, James E. (Madison, WI)
2002-01-01T23:59:59.000Z
The present invention relates to means for the detection and characterization of nucleic acid sequences, as well as variations in nucleic acid sequences. The present invention also relates to methods for forming a nucleic acid cleavage structure on a target sequence and cleaving the nucleic acid cleavage structure in a site-specific manner. The structure-specific nuclease activity of a variety of enzymes is used to cleave the target-dependent cleavage structure, thereby indicating the presence of specific nucleic acid sequences or specific variations thereof.
Research paper Changes in hydraulic geometry of the Hwang River below the Hapcheon
Julien, Pierre Y.
for correspondence) ABSTRACT The changes in hydraulic geometry of the Hwang River downstream of Hapcheon Dam have; alluvial channels; downstream hydraulic geometry; dams; re-regulation dams; Hwang River 1 Introduction DamsResearch paper Changes in hydraulic geometry of the Hwang River below the Hapcheon Re
Turk, Stacey N.
2010-01-14T23:59:59.000Z
calves as yearlings optimizes beef fatty acid composition. M.S. thesis, College Station: Texas A&M University. Chung, K.Y., Lunt, D.K., Choi, C.B., Chae, S.H., Rhoades, R.D., Adams, T.H., Booren, B., & Smith, S.B. (2006). Lipid characteristics... of subcutaneous adipose tissue and M. longissiumus thoracis of Angus and Wagyu steers fed to U.S. and Japanese endpoints. Meat Science, 73(3), 432-441. Chung, K.Y., Lunt, D.K., Kawachi, H., Yano, H., & Smith, S.B. (2005). Stearoyl coenzyme A desaturase...
Classical and Quantum Surgery of Geometries in an Open Inflationary Universe
Sang Pyo Kim
2000-05-09T23:59:59.000Z
We study classically and quantum mechanically the Euclidean geometries compatible with an open inflationary universe of a Lorentzian geometry. The Lorentzian geometry of the open universe with an ordinary matter state matches either an open or a closed Euclidean geometry at the cosmological singularity. With an exotic matter state it matches only the open Euclidean geometry and describes a genuine instanton regular at the boundary of a finite radius. The wave functions are found that describe the quantum creation of the open inflationary universe.
A transient, quadratic nodal method for triangular-Z geometry
DeLorey, T.F.
1993-06-01T23:59:59.000Z
Many systematically-derived nodal methods have been developed for Cartesian geometry due to the extensive interest in Light Water Reactors. These methods typically model the transverse-integrated flux as either an analytic or low order polynomial function of position within the node. Recently, quadratic nodal methods have been developed for R-Z and hexagonal geometry. A static and transient quadratic nodal method is developed for triangular-Z geometry. This development is particularly challenging because the quadratic expansion in each node must be performed between the node faces and the triangular points. As a consequence, in the 2-D plane, the flux and current at the points of the triangles must be treated. Quadratic nodal equations are solved using a non-linear iteration scheme, which utilizes the corrected, mesh-centered finite difference equations, and forces these equations to match the quadratic equations by computing discontinuity factors during the solution. Transient nodal equations are solved using the improved quasi-static method, which has been shown to be a very efficient solution method for transient problems. Several static problems are used to compare the quadratic nodal method to the Coarse Mesh Finite Difference (CMFD) method. The quadratic method is shown to give more accurate node-averaged fluxes. However, it appears that the method has difficulty predicting node leakages near reactor boundaries and severe material interfaces. The consequence is that the eigenvalue may be poorly predicted for certain reactor configurations. The transient methods are tested using a simple analytic test problem, a heterogeneous heavy water reactor benchmark problem, and three thermal hydraulic test problems. Results indicate that the transient methods have been implemented correctly.
The nucleation of false vacuum bubbles with compact geometries
Bum-Hoon Lee; Chul H. Lee; Wonwoo Lee; Changheon Oh
2013-11-18T23:59:59.000Z
We investigate the nucleation process for the possible types of vacuum bubbles. We classify false vacuum bubbles of a self-gravitating scalar field with compact geometries. We show that there exist numerical solutions representing the tunneling from the true vacuum state to the false vacuum state. The solutions are possible only gravity taken into account. We present the analytic computations for the radius and nucleation rate of a vacuum bubble using the thin-wall approximation. We discuss possible cosmological implications of our solutions.
Precise adiabatic transport and geometry of quantum Hall states
Klevtsov, Semyon
2015-01-01T23:59:59.000Z
We argue that in addition to the Hall conductance and the non-dissipative component of the viscous tensor there exists a third independent kinetic coefficient which is precise on the quantum Hall plateaus. We show that the new coefficient is the Chern number over moduli space of surfaces of genus two or higher and therefore is precise. As such it does not transpire on a sphere or a torus. In the linear response theory this coefficient determines intensive forces exerted on electronic fluid by adiabatic deformations of geometry and represents the effect of the gravitational anomaly. We also present the method of computing the transport coefficients for quantum Hall states.
Worldline Numerics for Energy-Momentum Tensors in Casimir Geometries
Schafer, Marco; Gies, Holger
2015-01-01T23:59:59.000Z
We develop the worldline formalism for computations of composite operators such as the fluctuation induced energy-momentum tensor. As an example, we use a fluctuating real scalar field subject to Dirichlet boundary conditions. The resulting worldline representation can be evaluated by worldline Monte-Carlo methods in continuous spacetime. We benchmark this worldline numerical algorithm with the aid of analytically accessible single-plate and parallel-plate Casimir configurations, providing a detailed analysis of statistical and systematic errors. The method generalizes straightforwardly to arbitrary Casimir geometries and general background potentials.
Acoustic geometry for general relativistic barotropic irrotational fluid flow
Visser, Matt
2010-01-01T23:59:59.000Z
"Acoustic spacetimes", in which techniques of differential geometry are used to investigate sound propagation in moving fluids, have attracted considerable attention over the last few decades. Most of the models currently considered in the literature are based on non-relativistic barotropic irrotational fluids, defined in a flat Newtonian background. The extension, first to special relativistic barotropic fluid flow, and then to general relativistic barotropic fluid flow in an arbitrary background, is less straightforward than it might at first appear. In this article we provide a pedagogical and simple derivation of the general relativistic "acoustic spacetime" in an arbitrary (d+1) dimensional curved-space background.
Noncommutative geometry, Grand Symmetry and twisted spectral triple
Agostino Devastato
2015-03-09T23:59:59.000Z
In the noncommutative geometry approach to the standard model we discuss the possibility to derive the extra scalar field sv- initially suggested by particle physicist to stabilize the electroweak vacuum - from a "grand algebra" that contains the usual standard model algebra. We introduce the Connes-Moscovici twisted spectral triples for the Grand Symmetry model, to cure a technical problem, that is the appearance, together with the field sv, of unbounded vectorial terms. The twist makes these terms bounded, and also permits to understand the breaking making the computation of the Higgs mass compatible with the 126 GeV experimental value.
Noncommutative spectral geometry, Bogoliubov transformations and neutrino oscillations
Gargiulo, Maria Vittoria; Vitiello, Giuseppe
2015-01-01T23:59:59.000Z
In this report we show that neutrino mixing is intrinsically contained in Connes' noncommutative spectral geometry construction, thanks to the introduction of the doubling of algebra, which is connected to the Bogoliubov transformation. It is known indeed that these transformations are responsible for the mixing, turning the mass vacuum state into the flavor vacuum state, in such a way that mass and flavor vacuum states are not unitary equivalent. There is thus a red thread that binds the doubling of algebra of Connes' model to the neutrino mixing.
Noncommutative spectral geometry, Bogoliubov transformations and neutrino oscillations
Maria Vittoria Gargiulo; Mairi Sakellariadou; Giuseppe Vitiello
2015-02-10T23:59:59.000Z
In this report we show that neutrino mixing is intrinsically contained in Connes' noncommutative spectral geometry construction, thanks to the introduction of the doubling of algebra, which is connected to the Bogoliubov transformation. It is known indeed that these transformations are responsible for the mixing, turning the mass vacuum state into the flavor vacuum state, in such a way that mass and flavor vacuum states are not unitary equivalent. There is thus a red thread that binds the doubling of algebra of Connes' model to the neutrino mixing.
Hessian matrix, specific heats, Nambu brackets, and thermodynamic geometry
Seyed Ali Hosseini Mansoori; Behrouz Mirza; Mohamadreza Fazel
2015-05-06T23:59:59.000Z
As an extension to our earlier work \\cite{Mirza2}, we employ the Nambu brackets to prove that the divergences of heat capacities correspond to their counterparts in thermodynamic geometry. We also obtain a simple representation for the conformal transformations that connect different thermodynamics metrics to each other. Using our bracket approach, we obtain interesting exact relations between the Hessian matrix with any number of parameters and specific heat capacities. Finally, we employ this approach to investigate some thermodynamic properties of the Meyers-Perry black holes with three spins.
Single chamber fuel cells: Flow geometry, rate and composition considerations
Stefan, Ionel C.; Jacobson, Craig P.; Visco, Steven J.; De Jonghe, Lutgard C.
2003-11-17T23:59:59.000Z
Four different single chamber fuel cell designs were compared using propane-air gas mixtures. Gas flow around the electrodes has a significant influence on the open circuit voltage and the power density of the cell. The strong influence of flow geometry is likely due to its effect on gas composition, particularly on the oxygen chemical potential at the two electrodes as a result of gas mixing. The chamber design which exposes the cathode first to the inlet gas was found to yield the best performance at lower flow rates, while the open tube design with the electrodes equally exposed to the inlet gas worked best at higher flow rates.
Acidic gas capture by diamines
Rochelle, Gary (Austin, TX); Hilliard, Marcus (Missouri City, TX)
2011-05-10T23:59:59.000Z
Compositions and methods related to the removal of acidic gas. In particular, the present disclosure relates to a composition and method for the removal of acidic gas from a gas mixture using a solvent comprising a diamine (e.g., piperazine) and carbon dioxide. One example of a method may involve a method for removing acidic gas comprising contacting a gas mixture having an acidic gas with a solvent, wherein the solvent comprises piperazine in an amount of from about 4 to about 20 moles/kg of water, and carbon dioxide in an amount of from about 0.3 to about 0.9 moles per mole of piperazine.
Acidizing of Sandstone Reservoirs Using HF and Organic Acids
Yang, Fei
2012-10-19T23:59:59.000Z
concentrated HF can react with more clay minerals, but can also cause higher risk of CaF2 precipitate. Both formic-HF and acetic-HF acids are much milder than mud acid. When reacting with clay minerals, there is no big difference in the behaviors of 13 wt...
Gilliland, Patti Lynn
1978-01-01T23:59:59.000Z
molecules not directly involved in the TCA cycle, aspartate and glutamate, have been the subject of several investigations, primarily in relation to amino acid transport. The uptake of the dicarboxylic amino acids is fre- quently studied in conjunction... with the uptake of the structurally similar TCA cycle compounds (22, 44, 76). In 1968, Jacobson snd Metzenberg (29) reported that aspartate and glutamate uptake by N. crassa was gene-controlled. Pall (44) has described a mycelial amino acid transport system...
Carbonic Acid Pretreatment of Biomass
G. Peter van Walsum; Kemantha Jayawardhana; Damon Yourchisin; Robert McWilliams; Vanessa Castleberry
2003-05-31T23:59:59.000Z
This project sought to address six objectives, outlined below. The objectives were met through the completion of ten tasks. 1) Solidify the theoretical understanding of the binary CO2/H2O system at reaction temperatures and pressures. The thermodynamics of pH prediction have been improved to include a more rigorous treatment of non-ideal gas phases. However it was found that experimental attempts to confirm theoretical pH predictions were still off by a factor of about 1.8 pH units. Arrhenius experiments were carried out and the activation energy for carbonic acid appears to be substantially similar to sulfuric acid. Titration experiments have not yet confirmed or quantified the buffering or acid suppression effects of carbonic acid on biomass. 2) Modify the carbonic acid pretreatment severity function to include the effect of endogenous acid formation and carbonate buffering, if necessary. It was found that the existing severity functions serve adequately to account for endogenous acid production and carbonate effects. 3) Quantify the production of soluble carbohydrates at different reaction conditions and severity. Results show that carbonic acid has little effect on increasing soluble carbohydrate concentrations for pretreated aspen wood, compared to pretreatment with water alone. This appears to be connected to the release of endogenous acids by the substrate. A less acidic substrate such as corn stover would derive benefit from the use of carbonic acid. 4) Quantify the production of microbial inhibitors at selected reaction conditions and severity. It was found that the release of inhibitors was correlated to reaction severity and that carbonic acid did not appear to increase or decrease inhibition compared to pretreatment with water alone. 5) Assess the reactivity to enzymatic hydrolysis of material pretreated at selected reaction conditions and severity. Enzymatic hydrolysis rates increased with severity, but no advantage was detected for the use of carbonic acid compared to water alone. 6) Determine optimal conditions for carbonic acid pretreatment of aspen wood. Optimal severities appeared to be in the mid range tested. ASPEN-Plus modeling and economic analysis of the process indicate that the process could be cost competitive with sulfuric acid if the concentration of solids in the pretreatment is maintained very high (~50%). Lower solids concentrations result in larger reactors that become expensive to construct for high pressure applications.
Status of geometry effects on structural nuclear composite properties
Will Windes; Y. Katoh; L.L. Snead; E. Lara-Curzio; C. Henagar, Jr.
2005-09-01T23:59:59.000Z
structural ceramic composites being considered for control rod applications within the VHTR design. While standard sized (i.e. 150-mm long or longer) test specimens can be used for baseline non-irradiated thermal creep studies, very small, compact, tensile specimens will be required for the irradiated creep studies. Traditionally, it is standard practice to use small, representative test samples in place of full-size components for an irradiated study. However, a real problem exists for scale-up of composite materials. Unlike monolithic materials, these composites are engineered from two distinct materials using complicated infiltration techniques to provide full density and maximum mechanical properties. The material properties may be significantly affected when the component geometry or size is changed. It must be demonstrated that the smaller test samples used in an irradiated study will adequately represent larger composite tubes used for control rod applications. To accomplish this, two different test programs are being implemented to establish that small, flat test specimens are representative of the mechanical response for large, cylindrical composite tubes: a size effect study and a geometry effect study.
A physically based connection between fractional calculus and fractal geometry
Butera, Salvatore
2015-01-01T23:59:59.000Z
We show a relation between fractional calculus and fractals, based only on physical and geometrical considerations. The link has been found in the physical origins of the power-laws, ruling the evolution of many natural phenomena, whose long memory and hereditary properties are mathematically modelled by differential operators of non integer order. Dealing with the relevant example of a viscous fluid seeping through a fractal shaped porous medium, we show that, once a physical phenomenon or process takes place on an underlying fractal geometry, then a power-law naturally comes up in ruling its evolution, whose order is related to the anomalous dimension of such geometry, as well as to the model used to describe the physics involved. By linearizing the non linear dependence of the response of the system at hand to a proper forcing action then, exploiting the Boltzmann superposition principle, a fractional differential equation is found, describing the dynamics of the system itself. The order of such equation i...
Using Surface Impedance for Calculating Wakefields in Flat Geometry
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Bane, Karl; Stupakov, Gennady
2015-03-01T23:59:59.000Z
Beginning with Maxwell's equations and assuming only that the wall interaction can be approximated by a surface impedance, we derive formulas for the generalized longitudinal and transverse impedance in flat geometry, from which the wakefields can also be obtained. From the generalized impedances, by taking the proper limits, we obtain the normal longitudinal, dipole, and quad impedances in flat geometry. These equations can be applied to any surface impedance, such as the known dc, ac, and anomalous skin models of wall resistance, a model of wall roughness, or one for a pipe with small, periodic corrugations. We show that, for the particular case of dc wall resistance, the longitudinal impedance obtained here agrees with a known result in the literature, a result that was derived from a very general formula by Henke and Napoly. As concrete example, we apply our results to representative beam and machine parameters in the undulator region of LCLS-II and estimate the impact of the transverse wakes on the machine performance.
Using Surface Impedance for Calculating Wakefields in Flat Geometry
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Bane, Karl; Stupakov, Gennady
2015-03-01T23:59:59.000Z
Beginning with Maxwell's equations and assuming only that the wall interaction can be approximated by a surface impedance, we derive formulas for the generalized longitudinal and transverse impedance in flat geometry, from which the wakefields can also be obtained. From the generalized impedances, by taking the proper limits, we obtain the normal longitudinal, dipole, and quad impedances in flat geometry. These equations can be applied to any surface impedance, such as the known dc, ac, and anomalous skin models of wall resistance, a model of wall roughness, or one for a pipe with small, periodic corrugations. We show that, formore »the particular case of dc wall resistance, the longitudinal impedance obtained here agrees with a known result in the literature, a result that was derived from a very general formula by Henke and Napoly. As concrete example, we apply our results to representative beam and machine parameters in the undulator region of LCLS-II and estimate the impact of the transverse wakes on the machine performance.« less
Mecham, Robert
ANTIBODY PURIFICATION USING CAPRYLIC ACID In mildly acidic conditions, the addition of short-chain fatty acids such as caprylic acid to serum will precipitate most serum proteins with the exception or ammonium sulfate precipitation, caprylic acid will yield a relatively pure antibody preparation. 1. Measure
Toohey, Darin W.
acid and nitric acid. Sunlight increases the rate of most of these reactions. Electric utility plants;Gas Natural Sources Concentration Carbon dioxide CO2 Decomposition 355 ppm Nitric oxide NO Electric, 2010 #12;Gas Non-Natural Sources Concentration Nitric oxide NO Internal Combustion (cars) 0.2 ppm
The thermodynamic properties of some aminophosphonic acids
Austin, James Richard
1967-01-01T23:59:59.000Z
-Dimethylsminoethyl- phosphonic Acid IX. Various Points on the Titration Curves of N, N, N-Trimethylamino- ethylphosphonic Acid. LIST OF FIGURES Figure Page pK1 of All Four Amino Acids as a Function of 1/T. 18 II. pK2 of N-Methylaminoethylphosphonic Acid and N, N, N...-Trimethyleminoethyl- phosphonic Acid as a Function of 1/T. . . . . . 19 1II. pK2 of Aminoethylphosphonic Acid and N, N-Dimethylaminoethylphosphonic Acid as a Function of' 1/T 20 IV. pK of Aminoethylphosphonic Acid, N- Methylaminoethylphosphonic Acid, and N, N...
Black hole initial data with a horizon of prescribed intrinsic and extrinsic geometry
Brian Smith
2010-06-14T23:59:59.000Z
The purpose of this work is to construct asymptotically flat, time symmetric initial data with an apparent horizon of prescribed intrinsic and extrinsic geometry. To do this, we use the parabolic partial differential equation for prescribing scalar curvature. In this equation the horizon geometry is contained within the freely specifiable part of the metric. This contrasts with the conformal method in which the geometry of the horizon can only be specified up to a conformal factor.
Spin geometry and conservation laws in the Kerr spacetime
Andersson, Lars; Blue, Pieter
2015-01-01T23:59:59.000Z
In this paper we will review some facts, both classical and recent, concerning the geometry and analysis of the Kerr and related black hole spacetimes. This includes the analysis of test fields on these spacetimes. Central to our analysis is the existence of a valence $(2,0)$ Killing spinor, which we use to construct symmetry operators and conserved currents as well as a new energy momentum tensor for the Maxwell test fields on a class of spacetimes containing the Kerr spacetime. We then outline how this new energy momentum tensor can be used to obtain decay estimated for Maxwell test fields. An important motivation for this work is the black hole stability problem, where fields with non-zero spin present interesting new challenges. The main tool in the analysis is the 2-spinor calculus, and for completeness we introduce its main features.
Phenolate constrained geometry polymerization catalyst and method for preparing
Marks, T.J.; Chen, Y.X.
1999-01-05T23:59:59.000Z
The subject invention involves a method of preparing and the constrained geometry catalyst thereby prepared of the general formula Ar{prime}R4(O)Ar{double_prime}R{prime}{sub 4}M(CH{sub 2}Ph){sub 2} where Ar{prime} is a phenyl or naphthyl group; Ar{double_prime} is a cyclopentadienyl or indenyl group, R and R{prime} are H or alkyl substituents (C{<=}10) and M is Ti, Zr or Hf. The synthetic method involves a simple alkane elimination approach which permits a ``one-pot`` procedure. The catalyst, when combined with a cocatalyst such as Pb{sub 3}C{sup +}B(Ar{sub 3}{sup F}){sub 4}BAr{sub 3}{sup F} or methyl alumoxane where Ar{sup F} is a fluoroaryl group, is an effective catalyst for the polymerization of {alpha}-olefins such as ethylene, propylene and styrene. 1 fig.
Quantum statistics as geometry: Conflict, Mechanism, Interpretation, and Implication
Daniel C. Galehouse
2015-01-29T23:59:59.000Z
The conflict between the determinism of geometry in general relativity and the essential statistics of quantum mechanics blocks the development of a unified theory. Electromagnetic radiation is essential to both fields and supplies a common meeting ground. It is proposed that a suitable mechanism to resolve these differences can be based on the use of a time-symmetric treatment for the radiation. Advanced fields of the absorber can be interpreted to supply the random character of spontaneous emission. This allows the statistics of the Born rule to come from the spontaneous emission that occurs during a physical measurement. When the absorber is included, quantum mechanics is completely deterministic. It is suggested that the peculiar properties of kaons may be induced by the advanced effects of the neutrino field. Schr\\"odinger's cat loses its enigmatic personality and the identification of mental processes as an essential component of a measurement is no longer needed.
Interplay between geometry and flow distribution in an airway tree
Mauroy, B; Sapoval, B
2003-01-01T23:59:59.000Z
Uniform fluid flow distribution in a symmetric volume can be realized through a symmetric branched tree. It is shown here, however, that the flow partitioning can be highly sensitive to deviations from exact symmetry if inertial effects are present. This is found by direct numerical simulation of the Navier-Stokes equations in a 3D tree geometry. The flow asymmetry is quantified and found to depend on the Reynolds number. Moreover, for a given Reynolds number, we show that the flow distribution depends on the aspect ratio of the branching elements as well as their angular arrangement. Our results indicate that physiological variability should be severely restricted in order to ensure uniform fluid distribution in a tree. This study suggests that any non-uniformity in the air flow distribution in human lungs should be influenced by the respiratory conditions, rest or hard exercise.
Phenolate constrained geometry polymerization catalyst and method for preparing
Marks, Tobin J. (Evanston, IL); Chen, You-Xian (Chicago, IL)
1999-01-01T23:59:59.000Z
The subject invention involves a method of preparing and the constrained geometry catalyst thereby prepared of the general formula Ar'R4(O)Ar"R'.sub.4 M(CH.sub.2 Ph).sub.2 where Ar' is a phenyl or naphthyl group; Ar" is a cyclopentadienyl or indenyl group, R and R' are H or alkyl substituents (C.ltoreq.10) and M is Ti, Zr or Hf. The synthetic method involves a simple alkane elimination approach which permits a "one-pot" procedure. The catalyst, when combined with a cocatalyst such as Pb.sub.3 C.sup.+ B(Ar.sub.3.sup.F).sub.4 BAr.sub.3.sup.F or methyl alumoxane where Ar.sup.F is a fluoroaryl group, is an effective catalyst for the polymerization of .alpha.-olefins such as ethylene, propylene and styrene.
Programming new geometry restraints: Parallelity of atomic groups
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Sobolev, Oleg V.; Afonine, Pavel V.; Adams, Paul D.; Urzhumtsev, Alexandre
2015-08-01T23:59:59.000Z
Improvements in structural biology methods, in particular crystallography and cryo-electron microscopy, have created an increased demand for the refinement of atomic models against low-resolution experimental data. One way to compensate for the lack of high-resolution experimental data is to use a priori information about model geometry that can be utilized in refinement in the form of stereochemical restraints or constraints. Here, the definition and calculation of the restraints that can be imposed on planar atomic groups, in particular the angle between such groups, are described. Detailed derivations of the restraint targets and their gradients are provided so that they canmore »be readily implemented in other contexts. Practical implementations of the restraints, and of associated data structures, in the Computational Crystallography Toolbox(cctbx) are presented.« less
Electric field geometries dominate quantum transport coupling in silicon nanoring
Lee, Tsung-Han, E-mail: askaleeg@gmail.com, E-mail: sfhu.hu@gmail.com; Hu, Shu-Fen, E-mail: askaleeg@gmail.com, E-mail: sfhu.hu@gmail.com [Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan (China)
2014-03-28T23:59:59.000Z
Investigations on the relation between the geometries of silicon nanodevices and the quantum phenomenon they exhibit, such as the Aharonov–Bohm (AB) effect and the Coulomb blockade, were conducted. An arsenic doped silicon nanoring coupled with a nanowire by electron beam lithography was fabricated. At 1.47?K, Coulomb blockade oscillations were observed under modulation from the top gate voltage, and a periodic AB oscillation of ?B?=?0.178?T was estimated for a ring radius of 86?nm under a high sweeping magnetic field. Modulating the flat top gate and the pointed side gate was performed to cluster and separate the many electron quantum dots, which demonstrated that quantum confinement and interference effects coexisted in the doped silicon nanoring.
The geometry and topology of turbulence in active nematics
Luca Giomi
2014-09-04T23:59:59.000Z
The problem of low Reynolds number turbulence in active nematic fluids is theoretically addressed. Using numerical simulations I demonstrate that an incompressible turbulent flow, in two-dimensional active nematics, consists of an ensemble of vortices whose areas are exponentially distributed within a range of scales. Building on this evidence, I construct a mean-field theory of active turbulence by which several measurable quantities, including the spectral densities and the correlation functions, can be analytically calculated. Due to the profound connection between the flow geometry and the topological properties of the nematic director, the theory sheds light on the mechanisms leading to the proliferation of topological defects in active nematics and provides a number of testable predictions. A hypothesis, inspired by Onsager's statistical hydrodynamics, is finally introduced to account for the equilibrium probability distribution of the vortex sizes.
The generation of hexahedral meshes for assembly geometries: A survey
TAUTGES,TIMOTHY J.
2000-02-14T23:59:59.000Z
The finite element method is being used today to model component assemblies in a wide variety of application areas, including structural mechanics, fluid simulations, and others. Generating hexahedral meshes for these assemblies usually requires the use of geometry decomposition, with different meshing algorithms applied to different regions. While the primary motivation for this approach remains the lack of an automatic, reliable all-hexahedral meshing algorithm, requirements in mesh quality and mesh configuration for typical analyses are also factors. For these reasons, this approach is also sometimes required when producing other types of unstructured meshes. This paper will review progress to date in automating many parts of the hex meshing process, which has halved the time to produce all-hex meshes for large assemblies. Particular issues which have been exposed due to this progress will also be discussed, along with their applicability to the general unstructured meshing problem.
Geometry and Dynamics of Emergent Spacetime from Entanglement Spectrum
Hiroaki Matsueda
2015-08-03T23:59:59.000Z
We examine geometry and dynamics of classical spacetime derived from entanglement spectrum. The spacetime is a kind of canonical parameter space defined by the Fisher information metric. As a concrete example, we focus on the spectrum for free fermions in spatially one dimension. The spectrum has exponential family form like thermal probability distribution owing to mixed-state feature emerging from truncation of environmental degrees of freedom. In this case, the Fisher metric is given by the second derivative of the Hessian potential that can be identified with the entanglement entropy. We emphasize that the canonical parameters are nontrivial functions of partial system size by the truncation, filling fraction of fermions, and time. Then, the precise determination of this nontrivial mapping is necessary to derive the functional form of the Hessian potential that leads to correct entanglement entropy scaling. By this potential, we find that the emergent geometry becomes anti-de Sitter spacetime with imaginary time, and a radial axis as well as spacetime coordinates appears spontaneously. We also find that the information of the UV limit of the original free fermions lives in the boundary of the anti-de Sitter spacetime. These findings strongly suggest that the Hessian potential for free fermions has enough geometrical meaning associated with gauge-gravity correspondence. Furthermore, some deformation of the spectrum near the conformal fixed point is mapped onto spacetime dynamics. The fluctuation of the entanglement entropy embedded into the spacetime behaves like free scaler field, and the dynamics is described by the Einstein equation with a negative cosmological constant. Therefore, the Einstein equation can be regarded as the equation of original quantum state.
Cosmology in One Dimension: Fractal Geometry, Power Spectra and Correlation
Bruce N. Miller; Jean-Louis Rouet
2010-12-08T23:59:59.000Z
Concentrations of matter, such as galaxies and galactic clusters, originated as very small density fluctuations in the early universe. The existence of galaxy clusters and super-clusters suggests that a natural scale for the matter distribution may not exist. A point of controversy is whether the distribution is fractal and, if so, over what range of scales. One-dimensional models demonstrate that the important dynamics for cluster formation occur in the position-velocity plane. Here the development of scaling behavior and multifractal geometry is investigated for a family of one-dimensional models for three different, scale-free, initial conditions. The methodology employed includes: 1) The derivation of explicit solutions for the gravitational potential and field for a one-dimensional system with periodic boundary conditions (Ewald sums for one dimension); 2) The development of a procedure for obtaining scale-free initial conditions for the growing mode in phase space for an arbitrary power-law index; 3) The evaluation of power spectra, correlation functions, and generalized fractal dimensions at different stages of the system evolution. It is shown that a simple analytic representation of the power spectra captures the main features of the evolution, including the correct time dependence of the crossover from the linear to nonlinear regime and the transition from regular to fractal geometry. A possible physical mechanism for understanding the self-similar evolution is introduced. It is shown that hierarchical cluster formation depends both on the model and the initial power spectrum. Under special circumstances a simple relation between the power spectrum, correlation function, and correlation dimension in the highly nonlinear regime is confirmed.
Macroscopic traversable wormholes with zero tidal forces inspired by noncommutative geometry
Peter K. F. Kuhfittig
2015-01-08T23:59:59.000Z
This paper addresses the following issues: (1) the possible existence of macroscopic traversable wormholes, given a noncommutative-geometry background, and (2) the possibility of allowing zero tidal forces, given a known density. It is shown that whenever the energy density describes a classical wormhole, the resulting solution is incompatible with quantum field theory. If the energy density originates from noncommutative geometry, then zero tidal forces are allowed. Also attributable to the noncommutative geometry is the violation of the null energy condition. The wormhole geometry satisfies the usual requirements, including asymptotic flatness.
Gonzalez, R.L.; Pasternack, G.B.
2015-01-01T23:59:59.000Z
material entrainment and hydraulic geometry of gravel-bedbed rivers. Journal of Hydraulic Engineering, 135( 1), 66-Jonas, M.M. , 2001. Hydraulic design of stream restoration
Metabolism of Thioctic Acid in Algae
Grisebach, Hans; Fuller, R.C.; Calvin, M.
1956-01-01T23:59:59.000Z
METABOLISM OF THlOCTlC ACID IN ALGAE TWO-WEEK LOAN COPY ThisMETABOLISM OF THIOCTIC ACID IN ALGAE Hans Grisebach, R. , C.METABOLISM OF THIOCTIC ACID IN ALGAE Hans Grisebach, R. C.
Charge Transport through Organized Organic Assemblies in Confined Geometries
Schuckman, Amanda Eileen
2012-07-16T23:59:59.000Z
of the molecule, iv conductance switching behavior due to conformational or other effects as well as the stability of the molecular ensembles. Specifically, the transport properties of free base and zinc coordinated tri-pyridyl porphyrin thiol molecular... was not observed for single molecules of this compound or for the analogous free base. Scanning probe lithography via nanografting has been implemented to directly assemble nanoscale patterns of zinc porphyrin thiols and 16-mercapotohexadecanoic acid on Au...
In vivo incorporation of unnatural amino acids
Schultz, Peter (La Jolla, CA); Wang, Lei (San Diego, CA); Anderson, John Christopher (San Diego, CA); Chin, Jason W. (Cambridge, GB); Liu, David R. (Lexington, MA); Magliery, Thomas J. (North Haven, CT); Meggers, Eric (Philadelphia, PA); Mehl, Ryan Aaron (Lancaster, PA); Pastrnak, Miro (San Diego, CA)
2009-12-29T23:59:59.000Z
The invention provides methods and compositions for in vivo incorporation of unnatural amino acids. Also provided are compositions including proteins with unnatural amino acids
Seasonalepisodic control of acid deposition
Fay, James A.
1988-01-01T23:59:59.000Z
This report contains the climatological, technical and economic factors for episodic and seasonal control of emissions in existing power plants. Analyzing a large data set of acid deposition for the years 1982-85, we find ...
Controlling acid rain : policy issues
Fay, James A.
1983-01-01T23:59:59.000Z
The policy and regulatory ramifications of U.S. acid rain control programs are examined; particularly, the alternative of a receptor-oriented strategy as constrasted to emission-oriented proposals (e.g., the Mitchell bill) ...
Phosphonic acid based exchange resins
Horwitz, E.P.; Alexandratos, S.D.; Gatrone, R.C.; Chiarizia, R.
1995-09-12T23:59:59.000Z
An ion exchange resin is described for extracting metal ions from a liquid waste stream. An ion exchange resin is prepared by copolymerizing a vinylidene diphosphonic acid with styrene, acrylonitrile and divinylbenzene. 10 figs.
Phosphonic acid based exchange resins
Horwitz, E. Philip (Naperville, IL); Alexandratos, Spiro D. (Knoxville, TN); Gatrone, Ralph C. (Naperville, IL); Chiarizia, Ronato (Oak Park, IL)
1995-01-01T23:59:59.000Z
An ion exchange resin for extracting metal ions from a liquid waste stream. An ion exchange resin is prepared by copolymerizing a vinylidene diphosphonic acid with styrene, acrylonitrile and divinylbenzene.
Asphaltene damage in matrix acidizing
Hinojosa, Roberto Antonio
1996-01-01T23:59:59.000Z
This work addresses the problem of asphaltene deposition that occurs during acid treatments of oil reservoirs. Asphaltenes are present to some degree in most hydrocarbons. Due to the molecular weight of the components these asphaltenes are more...
Nitrate and Prussic Acid Poisoning
Stichler, Charles; Reagor, John C.
2001-09-05T23:59:59.000Z
Nitrate and prussic acid poisoning in cattle are noninfectious conditions that can kill livestock. This publication explains the causes and symptoms of these conditions as well as preventive measures and sampling and testing steps....
A fixed point formula of Lefschetz type in Arakelov geometry III: representations of
KÃ¶hler, Kai
A fixed point formula of Lefschetz type in Arakelov geometry III: representations We give a new proof of the Jantzen sum formula for integral repre- sentations of Chevalley formula of Lefschetz type in Arakelov geometry to generalized flag varieties. Our proof involves
Wahle, Andreas
Geometry and Catheter Position on Dose Delivery in Intracoronary Brachytherapy Andreas Wahle, # Senior---Instent restenosis is commonly observed in coronary arteries after intervention. Intravascular brachytherapy has been models for brachytherapy with beta (#) radiation neglect vessel geometry as well as the position
Transforming BIM to BEM: Generation of Building Geometry for the NASA Ames
LBNL-6033E Transforming BIM to BEM: Generation of Building Geometry for the NASA Ames by Tobias Maile and expanded by Cody Rose. #12;Transforming BIM to BEM: Generation of Building Geometry Ames project and was the enabling software that facilitated semi-automated data transformations. GST
Role of Eye, Head, and Shoulder Geometry in the Planning of Accurate Arm Movements
Henriques, Denise Y. P.
Role of Eye, Head, and Shoulder Geometry in the Planning of Accurate Arm Movements D.Y.P. HENRIQUES and shoulder geometry in the planning of accurate arm movements. J Neurophysiol 87: 16771685, 2002; 10.1152/jn with the continuous changes in eye, head, and arm positions. This is a geometrically complex process because the eyes
N/Z dependence of balance energy throughout the colliding geometries
Sakshi Gautam; Rajeev K. Puri
2011-07-28T23:59:59.000Z
We study the N/Z dependence of balance energy throughout the mass range for colliding geometry varying from central to peripheral ones. Our results indicate that balance energy decreases linearly with increase in N/Z ratio for all the masses throughout the colliding geometry range. Also, the N/Z dependence of balance energy is sensitive to symmetry energy.
Varshney, Amitabh
-Dependent Lighting Chang Ha Lee, Xuejun Hao, and Amitabh Varshney, Member, IEEE Abstract-- In this paper we introduce geometry- dependent lighting that allows lighting parameters to be defined independently and possibly discrepantly over an object or scene based on the local geometry. We present and discuss Light Collages
Preprint 0 (2001) ?{? 1 Recovering Mesh Geometry from a Sti ness Matrix
Stathopoulos, Andreas
2001-01-01T23:59:59.000Z
Preprint 0 (2001) ?{? 1 Recovering Mesh Geometry from a Sti#11;ness Matrix Andreas Stathopoulos#11;ness matrix A and a PDE, construct a mesh M such that the #12;nite-element formulation of the PDE. Keywords: Sti#11;ness matrix, mesh, geometry, triangulation, angles, graph embedding, graph drawing, non
SIMULATION OF GEOMETRY AND SHADOW EFFECTS IN 3D ORGANIC POLYMER SOLAR CELLS
Kassegne, Samuel Kinde
SIMULATION OF GEOMETRY AND SHADOW EFFECTS IN 3D ORGANIC POLYMER SOLAR CELLS OF THE THESIS Simulation of Geometry and Shadow Effects in 3D Organic Polymer Solar Cells by Mihir Prakashbhai solar energy closer to grid price parity. Major studies have been made in improving solar cell
Sensitivity of a Compressor Repeating-Stage to Geometry Jer^ome LAVAINNE
Peraire, Jaime
Sensitivity of a Compressor Repeating-Stage to Geometry Variation by J´er^ome LAVAINNE Dipl^ome d Students #12;2 #12;Sensitivity of a Compressor Repeating-Stage to Geometry Variation by J´er^ome LAVAINNE and probabilistic sensitivity analyses of an embedded compressor stage perfor- mance to blade geometric variations
Laminar Flow of a Sheared Vortex Crystal: Scars in Flat Geometry M.-Carmen Miguel,1
Miguel-Lopez, Carmen
Laminar Flow of a Sheared Vortex Crystal: Scars in Flat Geometry M.-Carmen Miguel,1 Adil Mughal,2 November 2010; published 15 June 2011) We consider the laminar flow of a vortex crystal in the Corbino disk geometry. Laminar flow can be induced by thermal fluctuations melting the crystal, but also by shear stress
Ramírez, Jorge A.
On downstream hydraulic geometry and optimal energy expenditure: case study of the Ashley the network. We look at energy expenditure from two perspectives. (1) In the context of downstream hydraulic Elsevier Science B.V. All rights reserved. Keywords: Downstream hydraulic geometry; River networks; Energy
Topology, Geometry, and Stability: Protein Folding and Evolution
Simmons, Walter
2015-01-01T23:59:59.000Z
The protein folding problem must ultimately be solved on all length scales from the atomic up through a hierarchy of complicated structures. By analyzing the stability of the folding process using physics and mathematics, this paper shows that features without length scales, i.e. topological features, are potentially of central importance. Topology is a natural mathematical tool for the study of shape and we avail ourselves of that tool to examine the relationship between the amino acid sequence and the shapes of protein molecules. We apply what we learn to conjectures about their biological evolution.
Phase space descriptions for simplicial 4d geometries
Bianca Dittrich; James P. Ryan
2010-06-17T23:59:59.000Z
Starting from the canonical phase space for discretised (4d) BF-theory, we implement a canonical version of the simplicity constraints and construct phase spaces for simplicial geometries. Our construction allows us to study the connection between different versions of Regge calculus and approaches using connection variables, such as loop quantum gravity. We find that on a fixed triangulation the (gauge invariant) phase space associated to loop quantum gravity is genuinely larger than the one for length and even area Regge calculus. Rather, it corresponds to the phase space of area-angle Regge calculus, as defined by Dittrich and Speziale in [arXiv:0802.0864] (prior to the imposition of gluing constraints, that ensure the metricity of the triangulation). We argue that this is due to the fact that the simplicity constraints are not fully implemented in canonical loop quantum gravity. Finally, we show that for a subclass of triangulations one can construct first class Hamiltonian and Diffeomorphism constraints leading to flat 4d space-times.
Hydrodynamically Lubricated Rotary Shaft Having Twist Resistant Geometry
Dietle, Lannie (Houston, TX); Gobeli, Jeffrey D. (Houston, TX)
1993-07-27T23:59:59.000Z
A hydrodynamically lubricated squeeze packing type rotary shaft with a cross-sectional geometry suitable for pressurized lubricant retention is provided which, in the preferred embodiment, incorporates a protuberant static sealing interface that, compared to prior art, dramatically improves the exclusionary action of the dynamic sealing interface in low pressure and unpressurized applications by achieving symmetrical deformation of the seal at the static and dynamic sealing interfaces. In abrasive environments, the improved exclusionary action results in a dramatic reduction of seal and shaft wear, compared to prior art, and provides a significant increase in seal life. The invention also increases seal life by making higher levels of initial compression possible, compared to prior art, without compromising hydrodynamic lubrication; this added compression makes the seal more tolerant of compression set, abrasive wear, mechanical misalignment, dynamic runout, and manufacturing tolerances, and also makes hydrodynamic seals with smaller cross-sections more practical. In alternate embodiments, the benefits enumerated above are achieved by cooperative configurations of the seal and the gland which achieve symmetrical deformation of the seal at the static and dynamic sealing interfaces. The seal may also be configured such that predetermined radial compression deforms it to a desired operative configuration, even through symmetrical deformation is lacking.
New Phenomena in NC Field Theory and Emergent Spacetime Geometry
Ydri, Badis [Institute of Physics BM Annaba University, BP 12-23000-Annaba (Algeria)
2010-10-31T23:59:59.000Z
We give a brief review of two nonperturbative phenomena typical of noncommutative field theory which are known to lead to the perturbative instability known as the UV-IR mixing. The first phenomena concerns the emergence/evaporation of spacetime geometry in matrix models which describe perturbative noncommutative gauge theory on fuzzy backgrounds. In particular we show that the transition from a geometrical background to a matrix phase makes the description of noncommutative gauge theory in terms of fields via the Weyl map only valid below a critical value g*. The second phenomena concerns the appearance of a nonuniform ordered phase in noncommutative scalar {phi}{sup 4} field theory and the spontaneous symmetry breaking of translational/rotational invariance which happens even in two dimensions. We argue that this phenomena also originates in the underlying matrix degrees of freedom of the noncommutative field theory. Furthermore it is conjectured that in addition to the usual WF fixed point at {theta} = 0 there must exist a novel fixed point at {theta} = {infinity} corresponding to the quartic hermitian matrix model.
Axisymmetric curvature-driven instability in a model divertor geometry
Farmer, W. A. [Physics and Astronomy Department, University of California Los Angeles, Los Angeles, California 90095 (United States) [Physics and Astronomy Department, University of California Los Angeles, Los Angeles, California 90095 (United States); Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550 (United States); Ryutov, D. D. [Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550 (United States)
2013-09-15T23:59:59.000Z
A model problem is presented which qualitatively describes a pressure-driven instability which can occur near the null-point in the divertor region of a tokamak where the poloidal field becomes small. The model problem is described by a horizontal slot with a vertical magnetic field which plays the role of the poloidal field. Line-tying boundary conditions are applied at the planes defining the slot. A toroidal field lying parallel to the planes is assumed to be very strong, thereby constraining the possible structure of the perturbations. Axisymmetric perturbations which leave the toroidal field unperturbed are analyzed. Ideal magnetohydrodynamics is used, and the instability threshold is determined by the energy principle. Because of the boundary conditions, the Euler equation is, in general, non-separable except at marginal stability. This problem may be useful in understanding the source of heat transport into the private flux region in a snowflake divertor which possesses a large region of small poloidal field, and for code benchmarking as it yields simple analytic results in an interesting geometry.
$?$-Ray Pulsars: Emission Zones and Viewing Geometries, A Computer Animation
I. -A. Yadigaroglu; Roger W. Romani
1994-06-08T23:59:59.000Z
The computer animation illustrates the geometries described in a paper by the same authors. The preprint is available as number 9401045. The opening scene shows dipole field lines emanating from the polar caps of a rotating neutron star. The dipole axis is inclined along the green rods. The field lines shown are defined from the condition that they be tangent to the light cylinder (the cylindrical radius at which the tangential velocity of rotation reaches the speed of light). The static dipole field lines are smoothly morphed into the correct retarted-potential vacuum solutions. A red surface spanning these field lines is painted. In the next scene the blue surfaces represent the outer gaps above the surface of last closed field lines. High energy emission (blue) is produced in these outer gaps, and is beamed tangentially along the field lines. The radio emission (green) originates close to the surface of the star and is beamed along the dipole axes. The inclination angle $\\alpha$ of the dipole and the viewing angle $\\zeta$ are chosen to match the Crab parameters; $\\alpha$ = 70, $\\zeta$ = 65. The corresponding light curve is computed and shown for these angles, and the red dot traces rotation phase. The next scene shows the situation for angles appropriate to PSR1706-44; $\\alpha$ = 45, $\\zeta$ = 65. The final scene is a possibility for Geminga; $\\alpha$ = 20, $\\zeta$ = 75. These angles are poorly constrained as there is no radio emission.
Tailoring dielectric resonator geometries for directional scattering and Huygens’ metasurfaces
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Campione, Salvatore; Basilio, Lorena I.; Warne, Larry K.; Sinclair, Michael B.
2015-01-28T23:59:59.000Z
In this paper we describe a methodology for tailoring the design of metamaterial dielectric resonators, which represent a promising path toward low-loss metamaterials at optical frequencies. We first describe a procedure to decompose the far field scattered by subwavelength resonators in terms of multipolar field components, providing explicit expressions for the multipolar far fields. We apply this formulation to confirm that an isolated high-permittivity dielectric cube resonator possesses frequency separated electric and magnetic dipole resonances, as well as a magnetic quadrupole resonance in close proximity to the electric dipole resonance. We then introduce multiple dielectric gaps to the resonator geometrymore »in a manner suggested by perturbation theory, and demonstrate the ability to overlap the electric and magnetic dipole resonances, thereby enabling directional scattering by satisfying the first Kerker condition. We further demonstrate the ability to push the quadrupole resonance away from the degenerate dipole resonances to achieve local behavior. These properties are confirmed through the multipolar expansion and show that the use of geometries suggested by perturbation theory is a viable route to achieve purely dipole resonances for metamaterial applications such as wave-front manipulation with Huygens’ metasurfaces. Our results are fully scalable across any frequency bands where high-permittivity dielectric materials are available, including microwave, THz, and infrared frequencies.« less
Functional determinants, generalized BTZ geometries and Selberg zeta function
R Aros; D E Diaz
2009-09-30T23:59:59.000Z
We continue the study of a special entry in the AdS/CFT dictionary, namely a holographic formula relating the functional determinant of the scattering operator in an asymptotically locally anti-de Sitter (ALAdS) space to a relative functional determinant of the scalar Laplacian in the bulk. A heuristic derivation of the formula involves a one-loop quantum effect in the bulk and the corresponding sub-leading correction at large N on the boundary. We presently explore a higher-dimensional version of the spinning BTZ black hole obtained as a quotient of hyperbolic space by a discrete subgroup of isometries generated by a loxodromic (or hyperbolic) element consisting of dilation (temperature) and torsion angles (spinning). The bulk computation is done using heat-kernel techniques and fractional calculus. At the boundary, we get a recursive scheme that allows us to range from the non-spinning to the full-fledged spinning geometries. The determinants are compactly expressed in terms of an associated (Patterson-)Selberg zeta function and a connection to quasi-normal frequencies is discussed.
Plasma confinement by circularly polarized electromagnetic field in toroidal geometry
Svidzinski, Vladimir A. [University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States); and Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2007-10-15T23:59:59.000Z
A novel plasma confinement concept based on plasma confinement by electromagnetic pressure of circularly polarized electromagnetic fields is proposed. Practical implementation of this concept in a toroidal device is suggested. In this concept the confining field frequency is in the lower range such that the size of the device is much smaller than the vacuum wavelength. Most of the previous radio-frequency (rf) confinement concepts of unmagnetized plasma were related to confinement in rf cavities which operated at high frequency for which the size of the cavity is comparable to the wavelength. Operation at lower frequencies simplifies rf design, reduces Ohmic losses in the conducting walls and probably makes application of superconductors for wall materials more feasible. It is demonstrated that circular (or nearly circular) polarization of the electromagnetic field is required for confinement from both the equilibrium and stability considerations. Numerical analysis of plasma confinement for magnetohydrodynamic plasma model in two-dimensional toroidal geometry is performed. Within this model plasma is confined by the applied rf fields and its equilibrium is stable. Technically feasible compact and medium size toroidal plasma confinement devices based on this concept are proposed. Application of this approach to the fusion reactor requires use of superconducting materials for the toroidal shell to reduce the Ohmic losses. Further theoretical and experimental studies are required for a more reliable conclusion about the attractiveness of this plasma confinement concept.
Trapped surfaces and nature of singularities in Lyra's geometry
Amir Hadi Ziaie; Arash Ranjbar; Hamid Reza Sepangi
2015-01-10T23:59:59.000Z
Motivated by the geometrical interpretation of Brans-Dicke (BD) scalar field which may also act as a torsion potential in Lyra geometry, we study the effects of spacetime torsion on the dynamics of a collapsing massive star. Taking the interior spacetime as the FLRW metric and the matter content as spherically symmetric, homogeneous perfect fluid with the equation of state (EoS) $p=w\\rho$, we show that the collapse ends in a spacetime singularity which is of the strong curvature type in the sense of Tipler. Whether the trapped surfaces form during the dynamical evolution of the collapse depends on the torsion parameter, related to the BD coupling parameter, and the EoS subject to the conditions on physical reasonableness of the collapse configuration. Hence, the space of torsion and EoS parameters is divided into two portions, one for which the collapse process leads to the formation of apparent horizon and the other for which the apparent horizon is failed to form in the interior region. The nature of the singularity is examined from the exterior perspective, by searching for the existence of radial null geodesics reaching the faraway observers. Moreover, it is found that the effects of a dynamical torsion can be transferred to the outside region of the collapsing star, making the exterior region dynamic.
Quantum Riemannian geometry of phase space and nonassociativity
Edwin J. Beggs; Shahn Majid
2014-10-29T23:59:59.000Z
Noncommutative or `quantum' differential geometry has emerged in recent years as a process for quantizing not only a classical space into a noncommutative algebra (as familiar in quantum mechanics) but also differential forms, bundles and Riemannian structures at this level. The data for the algebra quantisation is a classical Poisson bracket, the data for the quantum differential forms is a Poisson-compatible connection it was recently shown that after this, classical data such as classical bundles, metrics etc. all become quantised in a canonical `functorial' way at least to 1st order in deformation theory. There are, however, fresh compatibility conditions between the classical Riemannian and the Poisson structures as well as new physics such as nonassociativity at 2nd order. We give an introduction to this theory and some details for the case of CP${}^n$ where the commutation relations have the canonical form $[w^i,\\bar w^j]=\\mathrm{i}\\lambda\\delta_{ij}$ similar to the proposal of Penrose for quantum twistor space. Our work provides a canonical but ultimately nonassociative differential calculus on this algebra and quantises the metric and Levi-Civita connection at lowest order in $\\lambda$.
Process for the reclamation of battery acid and fluid from expended lead-acid batteries
Spitz, R.A.
1990-11-20T23:59:59.000Z
This patent describes a method for recycling contaminated sulfuric acid from lead acid batteries to reclaimed sulfuric acid fore reuse in the batteries by removing contaminating iron impurities. It comprises: diluting the contaminated sulfuric acid to a concentration between 150 and 230 grams per liter; filtering the sulfuric acid through a first filter means to remove solid impurities.
Method for production of petroselinic acid and OMEGA12 hexadecanoic acid in transgenic plants
Ohlrogge, J.B.; Cahoon, E.B.; Shanklin, J.; Somerville, C.R.
1995-07-04T23:59:59.000Z
The present invention relates to a process for producing lipids containing the fatty acid, petroselinic acid, in plants. The production of petroselinic acid is accomplished by genetically transforming plants which do not normally accumulate petroselinic acid with a gene for a {omega}12 desaturase from another species which does normally accumulate petroselinic acid. 19 figs.
Method for production of petroselinic acid and OMEGA12 hexadecanoic acid in transgenic plants
Ohlrogge, John B. (Okemos, MI); Cahoon, Edgar B. (Lansing, MI); Shanklin, John (Upton, NY); Somerville, Christopher R. (Okemos, MI)
1995-01-01T23:59:59.000Z
The present invention relates to a process for producing lipids containing the fatty acid petroselinic acid in plants. The production of petroselinic acid is accomplished by genetically transforming plants which do not normally accumulate petroselinic acid with a gene for a .omega.12 desaturase from another species which does normally accumulate petroselinic acid.
Astrid Lambrecht; Antoine Canaguier-Durand; Romain Guérout; Serge Reynaud
2010-06-17T23:59:59.000Z
We present calculations of the quantum and thermal Casimir interaction between real mirrors in electromagnetic fields using the scattering approach. We begin with a pedagogical introduction of this approach in simple cases where the scattering is specular. We then discuss the more general case of stationary arbitrarily shaped mirrors and present in particular applications to two geometries of interest for experiments, that is corrugated plates and the plane-sphere geometry. The results nicely illustrate the rich correlations existing between material properties, temperature and geometry in the Casimir effect.
Marcolli, Matilde
1 1 Matilde Marcolli Noncommutative geometry and number theory NAW 5/9 nr. 2 June 2008 109 Matilde geometry and number theory Noncommutative geometry, the study of spaces with a not necessarily commutative. In this article, Matilde Marcolli provides us with some impressions of this emerging field. Noncommutative
roof by using the developed computational tools 031.PDF Keywords: Architectural Geometry, Procedural an innovative computational design tool used to edit architectural geometry interactively and demonstrates the process of designing geometry using the developed tool. The background, related work, implementation
Lipfert, F.W.
1992-12-31T23:59:59.000Z
Airborne particles have long been associated with adverse effects on public health, begin with the notorious air pollution disasters of several decades ago. Although H{sub 2}SO{sub 4} was identified early on as a potential causal factors during these episodes (in part because of concern for potential health effects of particle acidity per se has intensified only recently. Most of the recent aerometric research in the US on acid fog has focused on the ability of clouds and fog to deliver acidity to vegetation and ecosystems. Strong acids are characterized chemically by their pH or H{sup +} concentration. For fog, concentrations are referred to the droplet liquid content; for other (i.e., ``clear air``) aerosols, to the volume of air sampled. A useful measure of the relationship between aerosol and fog is obtained by comparing their mass concentrations on the basis of the same volume of air, by multiplying fogwater concentrations by liquid water content (LWC). This paper reviews fog measurement capability, physical properties and chemistry, and presents a simple urban airshed model which is used to simulate the evolution of fog and aerosol concentrations under urban stagnation conditions.
Numerical Study of Geometry and Rotation Dependence on the Flow in Labyrinth Seals
Yamsani, Vamshi Krishna
2011-10-21T23:59:59.000Z
A computational study was conducted on the flow, both compressible and incompressible, in a labyrinth seal at various geometries and rotation rates. The computations were performed using the commercial software Fluent® which solves the k-? model...
Algorithms and tools for high-throughput geometry-based analysis...
Office of Scientific and Technical Information (OSTI)
Algorithms and tools for high-throughput geometry-based analysis of crystalline porous materials Citation Details In-Document Search Title: Algorithms and tools for high-throughput...
Riemannian Geometry Based on the Takagi's Factorization of the Metric Tensor
Juan Mendez
2015-07-05T23:59:59.000Z
The Riemannian geometry is one of the main theoretical pieces in Modern Mathematics and Physics. The study of Riemann Geometry in the relevant literature is performed by using a well defined analytical path. Usually it starts from the concept of metric as the primary concept and by using the connections as an intermediate geometric object, it is achieved the curvature and its properties. This paper presents a different analytical path to analyze the Riemannian geometry. It is based on a set of intermediate geometric objects obtained from the Takagi's factorization of the metric tensor. These intermediate objects allow a new viewpoint for the analysis of the geometry, provide conditions for the curved vs. flat manifolds, and also provide a new decomposition of the curvature tensor in canonical parts, which can be useful for Theoretical Physics.
Geometry of binocular imaging II : The augmented eye Victor S. Grinberg
Siegel, Mel
periscopes. It is the nature of these magnifying optical devices that the transverse (normal) magnification imaging, stereo imaging, binoculars, stereomicroscope, periscope, simulation, projective geometry 1, stereomicroscopes, and binocular periscopes. Usually optical devices introduce certain geometric distortions
The geometry of vacuum static spaces and deformations of scalar curvature
Yuan, Wei
2015-01-01T23:59:59.000Z
2 Classifications of vacuum static spaces 2.1 Bach flatness3.3 Conformal rigidity of vacuum static space . 4 Brown-YorkThe geometry of vacuum static spaces and deformations of
Combining recognition and geometry for data-driven 3D reconstruction
Owens, Andrew (Andrew Hale)
2013-01-01T23:59:59.000Z
Today's multi-view 3D reconstruction techniques rely almost exclusively on depth cues that come from multiple view geometry. While these cues can be used to produce highly accurate reconstructions, the resulting point ...
Automatically Recovering Geometry and Texture from Large Sets of Calibrated Images
Mellor, J.P.
1999-10-22T23:59:59.000Z
Three-dimensional models which contain both geometry and texture have numerous applications such as urban planning, physical simulation, and virtual environments. A major focus of computer vision (and recently graphics) ...
Investigation of Self-Heating Phenomenon in Small Geometry Vias Using Scanning Joule Expansion metallization levels) and increases in the current density and associated thermal effects, namely self-heating
A distributional approach to the geometry of 2D dislocations at the mesoscale
Lisbon, University of
A distributional approach to the geometry of 2D dislocations at the mesoscale Part A: General introduce the meso-scale as defined by some average distance between the dislocations. The laws governing
Griffin, Ryan A
2006-01-01T23:59:59.000Z
The aim of this thesis was to further characterize the effectiveness of field responsive fluids (FRFs) in geometries pertinent to the soldier and to examine the effects of specific geometric and kinematic parameters, ...
SEGMENTING CROSSING FIBER GEOMETRIES USING FLUID MECHANICS TENSOR DISTRIBUTION FUNCTION TRACTOGRAPHY
Thompson, Paul
SEGMENTING CROSSING FIBER GEOMETRIES USING FLUID MECHANICS TENSOR DISTRIBUTION FUNCTION introduce a fluid mechanics based tractography method that estimates the most likely connection path between using fluid mechanics based tractography has demonstrated superior performance vs. other competing
The geometry of vacuum static spaces and deformations of scalar curvature
Yuan, Wei
2015-01-01T23:59:59.000Z
2 Classifications of vacuum static spaces 2.1 Bach flatness3.3 Conformal rigidity of vacuum static space . 4 Brown-Yorkiv Abstract The geometry of vacuum static spaces and
Ohannessian, Mesrob I., 1981-
2005-01-01T23:59:59.000Z
This thesis develops a method to simulate and visualize the fields and energy flows in electric circuits, using a simplified physical model based on an idealized geometry. The physical models combine and extend previously ...
The Effects of Geometry on the Corona-to-Streamer Discharge Transition
Humbird, Kelli D
2013-01-31T23:59:59.000Z
UNDERGRADUATE RESEARCH SCHOLAR THE EFFECTS OF GEOMETRY ON THE CORONA-TO- STREAMER DISCHARGE TRANSITION An Undergraduate Research Scholars Thesis by KELLI DENISE HUMBIRD Approved by Research Advisor: Dr. William Marlow... ........................................................................................................................24 2 ABSTRACT The Effects of Geometry on the Corona-to-Streamer Discharge Transition. (May 2013) Kelli Denise Humbird Department of Nuclear Engineering Texas A&M University Research Advisor: Dr. William Marlow Department of Nuclear...
Effect of pore geometry in porous media on the miscibility of crude oil and carbon dioxide
Sarkhosh, Hamed
1977-01-01T23:59:59.000Z
EFFECT OF PORE GEOMETRY IN POROUS MEDIA ON THE MISCIBILITY OF CRUDE OIL AND CARBON DIOXIDE A Thesis by HAMED SARKHOSH Submitted to the Graduate College of Texas AIM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE May 1977 Major Subject: Petroleum Engineering EFFECT OF PORE GEOMETRY IN POROUS MEDIA ON THE MISCIBILITY OF CRUDE OIL AND CARBON DIOXIDE A Thesis by HAMED SARKHOSH Approved as to styie and content by Chai, an of Committee Head...
Effect of pore geometry in porous media on the miscibility of crude oil and carbon dioxide
Sarkhosh, Hamed
1977-01-01T23:59:59.000Z
EFFECT OF PORE GEOMETRY IN POROUS MEDIA ON THE MISCIBILITY OF CRUDE OIL AND CARBON DIOXIDE A Thesis by HAMED SARKHOSH Submitted to the Graduate College of Texas AIM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE May 1977 Major Subject: Petroleum Engineering EFFECT OF PORE GEOMETRY IN POROUS MEDIA ON THE MISCIBILITY OF CRUDE OIL AND CARBON DIOXIDE A Thesis by HAMED SARKHOSH Approved as to styie and content by Chai, an of Committee Head...
Starnes, Lee McKennon
1989-01-01T23:59:59.000Z
EFFECTS OF RESERVOIR GEOMETRY AND PERMEABILITY ANISOTROPY ON ULTIMATE GAS RECOVERY IN DEVONIAN SHALE RESERVOIRS A Thesis by LEE McKENNON STARNES Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE August 1989 Major Subject: Petroleum Engineering EFFECI'S OF RESERVOIR GEOMETRY AND PERMEABILITY ANISOTROPY ON ULTIMATE GAS RECOVERY IN DEVONIAN SHALE RESERVOIRS A Thesis LEE McKENNON STARNES Approved...
Replica amplification of nucleic acid arrays
Church, George M. (Brookline, MA)
2002-01-01T23:59:59.000Z
A method of producing a plurality of a nucleic acid array, comprising, in order, the steps of amplifying in situ nucleic acid molecules of a first randomly-patterned, immobilized nucleic acid array comprising a heterogeneous pool of nucleic acid molecules affixed to a support, transferring at least a subset of the nucleic acid molecules produced by such amplifying to a second support, and affixing the subset so transferred to the second support to form a second randomly-patterned, immobilized nucleic acid array, wherein the nucleic acid molecules of the second array occupy positions that correspond to those of the nucleic acid molecules from which they were amplified on the first array, so that the first array serves as a template to produce a plurality, is disclosed.
Recovery of mercury from acid waste residues
Greenhalgh, W.O.
1987-02-27T23:59:59.000Z
Mercury can be recovered from nitric acid-containing fluids by reacting the fluid with aluminum metal to produce mercury metal, and thence quenching the reactivity of the nitric acid prior to nitration of the mercury metal. 1 fig.
PREDICTING TEMPERATURE BEHAVIOR IN CARBONATE ACIDIZING TREATMENTS
Tan, Xuehao
2010-01-16T23:59:59.000Z
........................................................................................ 4 1.4 Objective and Procedures .................................................................. 4 1.5 Outline .............................................................................................. 5 2. ACID INJECTION PROBLEM.......................................................... 10 2.4 Wormhole Growth Model.................................................................. 11 2.5 Modified Volumetric Model .............................................................. 14 2.6 Solution of Acid Injection Problem...
Fuel cell electrolyte membrane with acidic polymer
Hamrock, Steven J. (Stillwater, MN); Larson, James M. (Saint Paul, MN); Pham, Phat T. (Little Canada, MN); Frey, Matthew H. (Cottage Grove, MN); Haugen, Gregory M. (Edina, MN); Lamanna, William M. (Stillwater, MN)
2009-04-14T23:59:59.000Z
An electrolyte membrane is formed by an acidic polymer and a low-volatility acid that is fluorinated, substantially free of basic groups, and is either oligomeric or non-polymeric.
Comparison of Three Cre-LoxP Based Paired-End Library Construction Methods
Peng, Ze; Nath, Nandita; Tritt, Andrew; Liang, Shoudan; Han, James; Pennacchio, Len; Chen, Feng
2013-03-26T23:59:59.000Z
Paired-end library sequencing has been proven useful in scaffold construction during de novo whole genome shotgun assembly. The ability of generating mate pairs with > 8 Kb insert sizes is especially important for genomes containing long repeats. To make mate paired libraries for next generation sequencing, DNA fragments need to be circularized to bring the ends together. There are several methods that can be used for DNA circulation, namely ligation, hybridization and Cre-LoxP recombination. With higher circularization efficiency with large insert DNA fragments, Cre-LoxP recombination method generally has been used for constructing >8 kb insert size paired-end libraries. Second fragmentation step is also crucial for maintaining high library complexity and uniform genome coverage. Here we will describe the following three fragmentation methods: restriction enzyme digestion, random shearing and nick translation. We will present the comparison results for these three methods. Our data showed that all three methods are able to generate paired-end libraries with greater than 20 kb insert. Advantages and disadvantages of these three methods will be discussed as well.
Production of high molecular weight polylactic acid
Bonsignore, P.V.
1995-11-28T23:59:59.000Z
A degradable high molecular weight poly(lactic acid) is described. The poly(lactic acid) has a terminal end group of one of carboxyl or hydroxyl groups with low molecular weight poly(lactic acid) units coupled with linking agents of di-isocyanates, bis-epoxides, bis-oxazolines and bis-ortho esters. The resulting high molecular weight poly(lactic acid) can be used for applications taking advantage of the improved physical properties.
Reactions Between Water Soluble Organic Acids and Nitrates in...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Between Water Soluble Organic Acids and Nitrates in Atmospheric Aerosols: Recycling of Nitric Acid and Formation of Reactions Between Water Soluble Organic Acids and Nitrates in...
Sandia National Laboratories: Due Diligence on Lead Acid Battery...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Due Diligence on Lead Acid Battery Recycling March 23, 2011 Lead Acid Batteries on secondary containment pallet Lead Acid Batteries on secondary containment pallet In 2004, the US...
Unnatural reactive amino acid genetic code additions
Deiters, Alexander; Cropp, T. Ashton; Chin, Jason W.; Anderson, J. Christopher; Schultz, Peter G.
2014-08-26T23:59:59.000Z
This invention provides compositions and methods for producing translational components that expand the number of genetically encoded amino acids in eukaryotic cells. The components include orthogonal tRNAs, orthogonal aminoacyl-tRNA synthetases, orthogonal pairs of tRNAs/synthetases and unnatural amino acids. Proteins and methods of producing proteins with unnatural amino acids in eukaryotic cells are also provided.
Unnatural reactive amino acid genetic code additions
Deiters, Alexander; Cropp, Ashton T; Chin, Jason W; Anderson, Christopher J; Schultz, Peter G
2013-05-21T23:59:59.000Z
This invention provides compositions and methods for producing translational components that expand the number of genetically encoded amino acids in eukaryotic cells. The components include orthogonal tRNAs, orthogonal aminoacyl-tRNA synthetases, pairs of tRNAs/synthetases and unnatural amino acids. Proteins and methods of producing proteins with unnatural amino acids in eukaryotic cells are also provided.
Organic Acid Production by Filamentous Fungi
biotechnology. However, unlike penicillin, the organic acids have had a less vis- ible impact on human well production to the available genomic data. 2. Commercial Successes: Organic Acids from Filamentous Fungi they exhibited the ability to produce large amounts of a particular organic acid. This prompts us to ask why
Synthesis of an acid addition salt of delta-aminolevulinic acid from 5-bromo levulinic acid esters
Moens, L.
1999-05-25T23:59:59.000Z
A process is disclosed for preparing an acid addition salt of delta-aminolevulinic acid comprising. The process involves dissolving a lower alkyl 5-bromolevulinate and an alkali metal diformylamide in an organic solvent selected from the group consisting of acetonitrile, methanol, tetrahydrofuran, 2-methyltetrahydrofuran and methylformate or mixtures to form a suspension of an alkyl 5-(N,N-diformylamino) levulinate ester; and hydrolyzing the alkyl 5-(N,N-diformylamino) levulinate with an inorganic acid to form an acid addition salt of delta-amino levulinic acid.
Synthesis of an acid addition salt of delta-aminolevulinic acid from 5-bromo levulinic acid esters
Moens, Luc (Lakewood, CO)
1999-01-01T23:59:59.000Z
A process of preparing an acid addition salt of delta-aminolevulinic acid comprising: dissolving a lower alkyl 5-bromolevulinate and an alkali metal diformylamide in an organic solvent selected from the group consisting of acetonitrile, methanol, tetrahydrofuran, 2-methyltetrahydrofuran and methylformate or mixtures thereof to form a suspension of an alkyl 5-(N,N-diformylamino) levulinate ester; and hydrolyzing said alkyl 5-(N,N-diformylamino) levulinate with an inorganic acid to form an acid addition salt of delta-amino levulinic acid.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt Documentation ARM DatagovInstrumentsuhsas Documentation ARMInstruments RelatedBarrow,PlansAcid Rain
Acid Diversion in Carbonate Reservoirs Using Polymer-Based In-Situ Gelled Acids
Gomaa, Ahmed Mohamed Mohamed
2012-07-16T23:59:59.000Z
and determine factors that impact its performance. Lab test of polymer-based in-situ gelled acids reveal that polymer and other additives separate out of the acid when these acids are prepared in high salinity water. In coreflood tests, in-situ gelled acid...
Hydrochloric Acid-Catalyzed Levulinic Acid Formation from Cellulose: Data and Kinetic
California at Riverside, University of
Hydrochloric Acid-Catalyzed Levulinic Acid Formation from Cellulose: Data and Kinetic Model.com). In this study, the kinetics of the acid catalyzed hydrolysis of microcrystalline cellulose (Avicel PH101 of conditions: 160200 C, hydrochloric acid concentrations of 0.3090.927 M (11.333.8 g/l), cellulose
Evaluation of acid fracturing based on the "acid fracture number" concept
Alghamdi, Abdulwahab
2006-08-16T23:59:59.000Z
................................................................................................. 29 4.2.1 Initial Pad Volume ........................................................................... 29 4.2.2 Acid Strength and Volume...............................................................30 V... stages of pad fluids and acids.11 The reaction of HCl with carbonate formations is fast, especially at high temperatures. This means that the acid will not be able to penetrate deeply down the fracture, which may affect the outcome of acid fracturing...
Method for sequencing nucleic acid molecules
Korlach, Jonas; Webb, Watt W.; Levene, Michael; Turner, Stephen; Craighead, Harold G.; Foquet, Mathieu
2006-06-06T23:59:59.000Z
The present invention is directed to a method of sequencing a target nucleic acid molecule having a plurality of bases. In its principle, the temporal order of base additions during the polymerization reaction is measured on a molecule of nucleic acid, i.e. the activity of a nucleic acid polymerizing enzyme on the template nucleic acid molecule to be sequenced is followed in real time. The sequence is deduced by identifying which base is being incorporated into the growing complementary strand of the target nucleic acid by the catalytic activity of the nucleic acid polymerizing enzyme at each step in the sequence of base additions. A polymerase on the target nucleic acid molecule complex is provided in a position suitable to move along the target nucleic acid molecule and extend the oligonucleotide primer at an active site. A plurality of labelled types of nucleotide analogs are provided proximate to the active site, with each distinguishable type of nucleotide analog being complementary to a different nucleotide in the target nucleic acid sequence. The growing nucleic acid strand is extended by using the polymerase to add a nucleotide analog to the nucleic acid strand at the active site, where the nucleotide analog being added is complementary to the nucleotide of the target nucleic acid at the active site. The nucleotide analog added to the oligonucleotide primer as a result of the polymerizing step is identified. The steps of providing labelled nucleotide analogs, polymerizing the growing nucleic acid strand, and identifying the added nucleotide analog are repeated so that the nucleic acid strand is further extended and the sequence of the target nucleic acid is determined.
Method for sequencing nucleic acid molecules
Korlach, Jonas; Webb, Watt W.; Levene, Michael; Turner, Stephen; Craighead, Harold G.; Foquet, Mathieu
2006-05-30T23:59:59.000Z
The present invention is directed to a method of sequencing a target nucleic acid molecule having a plurality of bases. In its principle, the temporal order of base additions during the polymerization reaction is measured on a molecule of nucleic acid, i.e. the activity of a nucleic acid polymerizing enzyme on the template nucleic acid molecule to be sequenced is followed in real time. The sequence is deduced by identifying which base is being incorporated into the growing complementary strand of the target nucleic acid by the catalytic activity of the nucleic acid polymerizing enzyme at each step in the sequence of base additions. A polymerase on the target nucleic acid molecule complex is provided in a position suitable to move along the target nucleic acid molecule and extend the oligonucleotide primer at an active site. A plurality of labelled types of nucleotide analogs are provided proximate to the active site, with each distinguishable type of nucleotide analog being complementary to a different nucleotide in the target nucleic acid sequence. The growing nucleic acid strand is extended by using the polymerase to add a nucleotide analog to the nucleic acid strand at the active site, where the nucleotide analog being added is complementary to the nucleotide of the target nucleic acid at the active site. The nucleotide analog added to the oligonucleotide primer as a result of the polymerizing step is identified. The steps of providing labelled nucleotide analogs, polymerizing the growing nucleic acid strand, and identifying the added nucleotide analog are repeated so that the nucleic acid strand is further extended and the sequence of the target nucleic acid is determined.
Solid-state actinide acid phosphites from phosphorous acid melts
Oh, George N. [Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556 (United States); Burns, Peter C., E-mail: pburns@nd.edu [Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556 (United States); Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556 (United States)
2014-07-01T23:59:59.000Z
The reaction of UO{sub 3} and H{sub 3}PO{sub 3} at 100 °C and subsequent reaction with dimethylformamide (DMF) produces crystals of the compound (NH{sub 2}(CH{sub 3}){sub 2})[UO{sub 2}(HPO{sub 2}OH)(HPO{sub 3})]. This compound crystallizes in space group P2{sub 1}/n and consists of layers of uranyl pentagonal bipyramids that share equatorial vertices with phosphite units, separated by dimethylammonium. In contrast, the reaction of phosphorous acid and actinide oxides at 210 °C produces a viscous syrup. Subsequent dilution in solvents and use of standard solution-state methods results in the crystallization of two polymorphs of the actinide acid phosphites An(HPO{sub 2}OH){sub 4} (An=U, Th) and of the mixed acid phosphite–phosphite U(HPO{sub 3})(HPO{sub 2}OH){sub 2}(H{sub 2}O)·2(H{sub 2}O). ?- and ?-An(HPO{sub 2}OH){sub 4} crystallize in space groups C2/c and P2{sub 1}/n, respectively, and comprise a three-dimensional network of An{sup 4+} cations in square antiprismatic coordination corner-sharing with protonated phosphite units, whereas U(HPO{sub 3})(HPO{sub 2}OH){sub 2}(H{sub 2}O){sub 2}·(H{sub 2}O) crystallizes in a layered structure in space group Pbca that is composed of An{sup 4+} cations in square antiprismatic coordination corner-sharing with protonated phosphites and water ligands. We discuss our findings in using solid inorganic reagents to produce a solution-workable precursor from which solid-state compounds can be crystallized. - Graphical abstract: Reaction of UO{sub 3} and H{sub 3}PO{sub 3} at 100 °C and subsequent reaction with DMF produces crystals of (NH{sub 2}(CH{sub 3}){sub 2})[UO{sub 2}(HPO{sub 2}OH)(HPO{sub 3})] with a layered structure. Reaction of phosphorous acid and actinide oxides at 210 °C produces a viscous syrup and further solution-state reactions result in the crystallization of the actinide acid phosphites An(HPO{sub 2}OH){sub 4} (An=U, Th), with a three-dimensional network structure, and the mixed acid phosphite–phosphite U(HPO{sub 3})(HPO{sub 2}OH){sub 2}(H{sub 2}O){sub 2}·(H{sub 2}O) with a layered structure. - Highlights: • U(VI), U(IV) and Th(IV) phosphites were synthesized by solution-state methods. • A new uranyl phosphite structure is based upon uranyl phosphite anionic sheets. • New U and Th phosphites have framework structures.
Gilliland, Patti Lynn
1978-01-01T23:59:59.000Z
~50 V E 0 40 V V Z 30 V Ih 'a 20 0 0 V 10 LEGEND ?, pH 4. l --~pH 7A) 0 0 8 12 16 20 TIME, minutes Figure 1. Time Course of Uptake and Accumulation of Succinic Acid at pH 4. 1 and pH 7. 0 (25'C). Each point represents means for data... to 20 140 pH 4. 1 25 C pH 7. 0 g 120 F100 I ~sc E ef 80 Z V lJ ul 40 0 p 40 2 Z 3'C 20 0 0 5 10 15 20 0 5 10 15 20 TIME, minutes Figure 2. Effect of Temperature on Uptake and Accumulation of Succinic Acid. External concentration...
Micro-electro-mechanical systems phosphoric acid fuel cell
Sopchak, David A. (Livermore, CA); Morse, Jeffrey D. (Martinez, CA); Upadhye, Ravindra S. (Pleasanton, CA); Kotovsky, Jack (Oakland, CA); Graff, Robert T. (Modesto, CA)
2010-12-21T23:59:59.000Z
A phosphoric acid fuel cell system comprising a porous electrolyte support, a phosphoric acid electrolyte in the porous electrolyte support, a cathode electrode contacting the phosphoric acid electrolyte, and an anode electrode contacting the phosphoric acid electrolyte.
Micro-electro-mechanical systems phosphoric acid fuel cell
Sopchak, David A. (Livermore, CA); Morse, Jeffrey D. (Martinez, CA); Upadhye, Ravindra S. (Pleasanton, CA); Kotovsky, Jack (Oakland, CA); Graff, Robert T. (Modesto, CA)
2010-08-17T23:59:59.000Z
A phosphoric acid fuel cell system comprising a porous electrolyte support, a phosphoric acid electrolyte in the porous electrolyte support, a cathode electrode contacting the phosphoric acid electrolyte, and an anode electrode contacting the phosphoric acid electrolyte.
Dynamics of laser-blow-off induced Li plume in confined geometry
Kumar, Bhupesh; Singh, R K; Kumar, Ajai [Institute for Plasma Research, Bhat, Gandhinagar-382 428 (India)] [Institute for Plasma Research, Bhat, Gandhinagar-382 428 (India)
2013-08-15T23:59:59.000Z
Dynamics of Li plasma plume created by laser-blow-off technique in air ambient is reported. Plasma plume dynamics and its optical emission are investigated in planar and confined geometries using time resolved shadowgraph imaging and optical emission spectroscopy. Significant differences in the plasma characteristics in confined geometry are quantitatively investigated by comparing the plasma parameters (temperature and density) in free expansion and confined geometry configurations. Dynamics and physical parameters of the primary as well as the reflected shock waves (in confined geometry) and their interactions with expanding plasma are briefly addressed. A large enhancement in the emission intensities of Li I 610.3 nm (2p {sup 2}P{sub 1/2,3/2}? 3d {sup 2}P{sub 3/2,5/2}) and 670.8 nm (2s {sup 2}S{sub 1/2}? 2p {sup 2}P{sub 1/2,3/2}) is correlated with the shock wave dynamics in the two geometries. Strong self reversal in the neutral emission infers an increase in the population density of neutrals within the confined plasma plume.
Geometry and quadratic nonlinearity of charge transfer complexes in solution: A theoretical study
Mukhopadhyay, S.; Ramasesha, S. [Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 (India); Pandey, Ravindra; Das, Puspendu K. [Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012 (India)
2011-01-28T23:59:59.000Z
In this paper, we have computed the quadratic nonlinear optical (NLO) properties of a class of weak charge transfer (CT) complexes. These weak complexes are formed when the methyl substituted benzenes (donors) are added to strong acceptors like chloranil (CHL) or di-chloro-di-cyano benzoquinone (DDQ) in chloroform or in dichloromethane. The formation of such complexes is manifested by the presence of a broad absorption maximum in the visible range of the spectrum where neither the donor nor the acceptor absorbs. The appearance of this visible band is due to CT interactions, which result in strong NLO responses. We have employed the semiempirical intermediate neglect of differential overlap (INDO/S) Hamiltonian to calculate the energy levels of these CT complexes using single and double configuration interaction (SDCI). The solvent effects are taken into account by using the self-consistent reaction field (SCRF) scheme. The geometry of the complex is obtained by exploring different relative molecular geometries by rotating the acceptor with respect to the fixed donor about three different axes. The theoretical geometry that best fits the experimental energy gaps, {beta}{sub HRS} and macroscopic depolarization ratios is taken to be the most probable geometry of the complex. Our studies show that the most probable geometry of these complexes in solution is the parallel displaced structure with a significant twist in some cases.
Double stranded nucleic acid biochips
Chernov, Boris; Golova, Julia
2006-05-23T23:59:59.000Z
This invention describes a new method of constructing double-stranded DNA (dsDNA) microarrays based on the use of pre-synthesized or natural DNA duplexes without a stem-loop structure. The complementary oligonucleotide chains are bonded together by a novel connector that includes a linker for immobilization on a matrix. A non-enzymatic method for synthesizing double-stranded nucleic acids with this novel connector enables the construction of inexpensive and robust dsDNA/dsRNA microarrays. DNA-DNA and DNA-protein interactions are investigated using the microarrays.
Solvent extraction of inorganic acids
Ysrael, Miguel Curie
1965-01-01T23:59:59.000Z
Page 10 27 NOi'!: KCL ITU8l: BIBLIOG. :l PI!Y ct:"P. '. t:OI:t 28 30 32 LIDT DF FIGUP, . " Al'!D T?DL. '. I F igure . olubility curve of wat-r and glycerol etl'er s I-'age 4 3 ~ '=quilibrium diagram for amyl alcohol- water-HC1... Correlation of eq;ilibrium da!. a of amyl alcohol-water-HC1 12 13 ~ ~ selectivity diagram for alcohol- 5 ~, '~electivity diagram for ethers G. Mole fr:ction di=tribution diagrav. . 7 ~ Activity coefficient of acids in water 0 ~ "ctivity coefficient...
Kinetics of adsorption of uranium from seawater by humic acids
Heitkamp, D. (Institut fuer Chemie Der Kernforschungsanlage Juelich (West Germany)); Wagener, K. (Lehrstuhl fuer Biophysik der Technischen Hochschule, Aachen (West Germany))
1990-04-01T23:59:59.000Z
The kinetics of the adsorption of uranium from seawater by humic acids fixed onto a polymer matrix was measured in a fluidized bed as a function of the grain size of the adsorbent and the flow velocity of the seawater. The adsorption rate was found to be governed by the diffusion of the uranium ions through the hydrodynamic surface layer of the adsorbent which is always formed in laminar flows of liquids. The measured rate constants are interpreted in terms of effective diffusion coefficients of 3.6 {times} 10{sup {minus}5} cm{sup 2}/s for uranyl ions and 1.8 {times} 10{sup {minus}5} cm{sup 2}/s for tricarbonatouranate ions in the surface layer. As a consequence of this kinetic behavior, the geometry of the adsorbent as well as the velocity of the water flow are relevant parameters for the amount of adsorbent needed for a projected extraction rate. This conclusion applies to all adsorption processes where diffusion through the hydrodynamic layer is the rate-determining kinetic step.
A new approach to euclidean plane geometry based on projective geometric algebra
Charles Gunn
2015-03-27T23:59:59.000Z
The article presents a new approach to euclidean plane geometry based on projective geometric algebra (PGA). After introducing the algebra, it presents the first detailed study of the geometric product of basic elements: pairs of lines, pairs of points, a point-line pair, 3 lines, and 3 points, with particular attention to the seamless integration of euclidean and ideal aspects. This yields a compact, powerful geometric toolkit which the article then applies to a variety of topics in plane euclidean geometry: distance formulae, sums and differences of points and of lines, isometries via sandwiches, the join operator, orthogonal projection, and a step-by-step solution of a sample geometric construction. In conclusion, the article compares the PGA approach to the analytic geometric approach and also alternative geometric algebra approaches to plane geometry. Numerous figures accompany the text. For readers with the requisite mathematical background, a self-contained coordinate-free introduction to the algebra is provided in an appendix.
New black holes of vacuum Einstein equations with hyperscaling violation and Nil geometry horizons
Mokhtar Hassaine
2015-03-05T23:59:59.000Z
In this paper, we present a new solution of the vacuum Einstein equations in five dimensions which is a static black hole with hyperscaling violation and with a three-dimensional horizon modeled by one the eight Thurston geometries, namely the Nil geometry. This homogeneous geometry is non-trivial in the sense that it is neither of constant curvature nor a product of constant curvature manifolds. Using the Hamiltonian formalism, we identify the mass and entropy of the black hole solution. Curiously enough, in spite of the fact that the entropy turns to be negative, the mass is positive and the first law of thermodynamics holds. We also discuss the extension in higher dimension.
Superanalogs of symplectic and contact geometry and their applications to quantum field theory
Albert Schwarz
1994-06-17T23:59:59.000Z
The paper contains a short review of the theory of symplectic and contact manifolds and of the generalization of this theory to the case of supermanifolds. It is shown that this generalization can be used to obtain some important results in quantum field theory. In particular, regarding $N$-superconformal geometry as particular case of contact complex geometry, one can better understand $N=2$ superconformal field theory and its connection to topological conformal field theory. The odd symplectic geometry constitutes a mathematical basis of Batalin-Vilkovisky procedure of quantization of gauge theories. The exposition is based mostly on published papers. However, the paper contains also a review of some unpublished results (in the section devoted to the axiomatics of $N=2$ superconformal theory and topological quantum field theory). The paper will be published in Berezin memorial volume.
FZ2MC: A Tool for Monte Carlo Transport Code Geometry Manipulation
Hackel, B M; Nielsen Jr., D E; Procassini, R J
2009-02-25T23:59:59.000Z
The process of creating and validating combinatorial geometry representations of complex systems for use in Monte Carlo transport simulations can be both time consuming and error prone. To simplify this process, a tool has been developed which employs extensions of the Form-Z commercial solid modeling tool. The resultant FZ2MC (Form-Z to Monte Carlo) tool permits users to create, modify and validate Monte Carlo geometry and material composition input data. Plugin modules that export this data to an input file, as well as parse data from existing input files, have been developed for several Monte Carlo codes. The FZ2MC tool is envisioned as a 'universal' tool for the manipulation of Monte Carlo geometry and material data. To this end, collaboration on the development of plug-in modules for additional Monte Carlo codes is desired.
The effect of discharge chamber geometry on the ignition of low-pressure rf capacitive discharges
Lisovskiy, V.; Martins, S.; Landry, K.; Douai, D.; Booth, J.-P.; Cassagne, V.; Yegorenkov, V. [Laboratoire de Physique et Technologie des Plasmas, Ecole Polytechnique, Palaiseau 91128, France and Kharkov National University, Kharkov 61077 (Ukraine); Unaxis Displays Division France SAS, 5, Rue Leon Blum, Palaiseau 91120 (France); Laboratoire de Physique et Technologie des Plasmas, Ecole Polytechnique, Palaiseau 91128 (France); Unaxis Displays Division France SAS, 5, Rue Leon Blum, Palaiseau 91120 (France); Kharkov National University, Kharkov 61077 (Ukraine)
2005-09-15T23:59:59.000Z
This paper reports measured and calculated breakdown curves in several gases of rf capacitive discharges excited at 13.56 MHz in chambers of three different geometries: parallel plates surrounded by a dielectric cylinder ('symmetric parallel plate'), parallel plates surrounded by a grounded metallic cylinder ('asymmetric parallel plate'), and parallel plates inside a much larger grounded metallic chamber ('large chamber'). The breakdown curves for the symmetric chamber have a multivalued section at low pressure. For the asymmetric chamber the breakdown curves are shifted to lower pressures and rf voltages, but the multivalued feature is still present. At higher pressures the breakdown voltages are much lower than for the symmetric geometry. For the large chamber geometry the multivalued behavior is not observed. The breakdown curves were also calculated using a numerical model based on fluid equations, giving results that are in satisfactory agreement with the measurements.
Proof-of-principle of a new geometry for sampling calorimetry using inorganic scintillator plates
Becker, R; Gendotti, A; Huang, Q; Luckey, D; Lustermann, W; Lutterer, S; Nessi-Tedaldi, F; Pandolfi, F; Pauss, F; Peruzzi, M; Quittnat, M; Wallny, R
2015-01-01T23:59:59.000Z
A novel geometry for a sampling calorimeter employing inorganic scintillators as an active medium is presented. To overcome the mechanical challenges of construction, an innovative light collection geometry has been pioneered, that minimises the complexity of construction. First test results are presented, demonstrating a successful signal extraction. The geometry consists of a sampling calorimeter with passive absorber layers interleaved with layers of an active medium made of inorganic scintillating crystals. Wavelength-shifting (WLS) fibres run along the four long, chamfered edges of the stack, transporting the light to photodetectors at the rear. To maximise the amount of scintillation light reaching the WLS fibres, the scintillator chamfers are depolished. It is shown herein that this concept is working for cerium fluoride (CeF$_3$) as a scintillator. Coupled to it, several different types of materials have been tested as WLS medium. In particular, materials that might be sufficiently resistant to the Hi...
Role of colliding geometry on the balance energy of mass-asymmetric systems
Supriya Goyal
2011-04-16T23:59:59.000Z
We study the role of colliding geometry on the balance energy (Ebal) of mass-asymmetric systems by varying the mass asymmetry ({\\eta} = AT - Ap/AT + AP, where AT and AP are the masses of the target and projectile, respectively) from 0.1 to 0.7, over the mass range 40-240 and on the mass dependence of the balance energy. Our findings reveal that colliding geometry has a significant effect on the Ebal of asymmetric systems. We find that, as we go from central collisions to peripheral ones, the effect of mass asymmetry on Ebal increases throughout the mass range. Interestingly, we find that for every fixed system mass (Atot) the effect of the impact parameter variation is almost uniform throughout the mass-asymmetry range. For each {\\eta}, Ebal follows a power-law behavior (\\propto A{\\tau}) at all colliding geometries
Magnetic geometry and physics of advanced divertors: The X-divertor and the snowflake
Kotschenreuther, Mike; Valanju, Prashant; Covele, Brent; Mahajan, Swadesh [Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States)] [Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States)
2013-10-15T23:59:59.000Z
Advanced divertors are magnetic geometries where a second X-point is added in the divertor region to address the serious challenges of burning plasma power exhaust. Invoking physical arguments, numerical work, and detailed model magnetic field analysis, we investigate the magnetic field structure of advanced divertors in the physically relevant region for power exhaust—the scrape-off layer. A primary result of our analysis is the emergence of a physical “metric,” the Divertor Index DI, which quantifies the flux expansion increase as one goes from the main X-point to the strike point. It clearly separates three geometries with distinct consequences for divertor physics—the Standard Divertor (DI = 1), and two advanced geometries—the X-Divertor (XD, DI > 1) and the Snowflake (DI < 1). The XD, therefore, cannot be classified as one variant of the Snowflake. By this measure, recent National Spherical Torus Experiment and DIIID experiments are X-Divertors, not Snowflakes.
Radha Balakrishnan; Indubala I Satija
2005-07-15T23:59:59.000Z
We derive gauge-invariant expressions for the twist $Tw$ and the linking number $Lk$ of a closed space curve, that are independent of the frame used to describe the curve, and hence characterize the intrinsic geometry of the curve. We are thus led to a {\\it frame-independent} version of the C\\u{a}lug\\u{a}reanu-White-Fuller theorem $Lk =Tw + Wr$ for a curve, where $Wr$ is the writhe of the curve. The gauge-invariant twist and writhe are related to two types of geometric phases associated with the curve. As an application, we study the geometry of the boundary curves of closed twisted strips. Interestingly, the M\\"obius strip geometry is singled out by a characteristic maximum that appears in the geometric phases, at a certain critical width of the strip.
Schneider, Kai
2015-01-01T23:59:59.000Z
Immersed boundary methods for computing confined fluid and plasma flows in complex geometries are reviewed. The mathematical principle of the volume penalization technique is described and simple examples for imposing Dirichlet and Neumann boundary conditions in one dimension are given. Applications for fluid and plasma turbulence in two and three space dimensions illustrate the applicability and the efficiency of the method in computing flows in complex geometries, for example in toroidal geometries with asymmetric poloidal cross-sections.
Canonical transformation for trapped/passing guiding-center orbits in axisymmetric tokamak geometry
Brizard, Alain J. [Department of Physics, Saint Michael's College, Colchester, Vermont 05439 (United States); Duthoit, François-Xavier [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); SNU Division of Graduate Education for Sustainabilization of Foundation Energy, Seoul National University, Seoul 151-742 (Korea, Republic of)
2014-05-15T23:59:59.000Z
The generating function for the canonical transformation from the parallel canonical coordinates (s,p{sub ||}) to the action-angle coordinates (?, J) for trapped/passing guiding-center orbits in axisymmetric tokamak geometry is presented. Drawing on the analogy between the phase-space portraits of the librating/rotating pendulum and the trapped/passing guiding-center orbits, the generating function is expressed in terms of the Jacobi zeta function, which can then readily be used to obtain an explicit expression for the bounce-center transformation for trapped/passing-particle guiding-center orbits in axisymmetric tokamak geometry.
Fuzzy Geometry via the Spinor Bundle, with Applications to Holographic Space-time and Matrix Theory
Tom Banks; John Kehayias
2011-11-02T23:59:59.000Z
We present a new framework for defining fuzzy approximations to geometry in terms of a cutoff on the spectrum of the Dirac operator, and a generalization of it that we call the Dirac-Flux operator. This framework does not require a symplectic form on the manifold, and is completely rotation invariant on an arbitrary n-sphere. The framework is motivated by the formalism of Holographic Space-Time (HST), whose fundamental variables are sections of the spinor bundle over a compact Euclidean manifold. The strong holographic principle (SHP) requires the space of these sections to be finite dimensional. We discuss applications of fuzzy spinor geometry to HST and to Matrix Theory.
Role of colliding geometry on the N/Z dependence of balance energy
Sakshi Gautam; Aman D. Sood; Rajeev K. Puri
2011-08-01T23:59:59.000Z
We study the role of colliding geometry on the N/Z dependence of balance energy using isospin-dependent quantum molecular dynamics model. Our study reveals that the N/Z dependence of balance energy becomes much steeper for peripheral collisions as compared to the central collisions. We also study the effect of system mass on the impact parameter dependence of N/Z dependence of balance energy. The study shows that lighter systems shows greater sensitivity to colliding geometry towards the N/Z dependence.
Geometry Effects on Multipole Components and Beam Optics in High-Velocity Multi-Spoke Cavities
Hopper, Christopher S. [ODU, JLAB; Deitrick, Kirsten E. [ODU, JLAB; Delayen, Jean R. [ODU, JLAB
2013-12-01T23:59:59.000Z
Velocity-of-light, multi-spoke cavities are being proposed to accelerate electrons in a compact light-source. There are strict requirements on the beam quality which require that the linac have only small non-uniformities in the accelerating field. Beam dynamics simulations have uncovered varying levels of focusing and defocusing in the proposed cavities, which is dependent on the geometry of the spoke in the vicinity of the beam path. Here we present results for the influence different spoke geometries have on the multipole components of the accelerating field and how these components, in turn, impact the simulated beam properties.
Liouville's Theorem and the canonical measure for nonconservative systems from contact geometry
Alessandro Bravetti; Diego Tapias
2014-11-28T23:59:59.000Z
Standard statistical mechanics of conservative systems relies on the symplectic geometry of the phase space. This is exploited to derive Hamilton's equations, Liouville's theorem and to find the canonical invariant measure. In this work we assume the phase space of nonconservative systems to have a contact geometry. In this way we can find out the generalized Hamilton's equations, Liouville's theorem and the unique canonical measure invariant under the contact flow. Remarkably, such measure has a power law density distribution with respect to the standard contact volume form. Finally, we argue on the several possible applications of our results.
Geometry for web microwave heating or drying to a desired profile in a waveguide
Habeger, Jr., Charles C.; Patterson, Timothy F.; Ahrens, Frederick W.
2005-11-15T23:59:59.000Z
A microwave heater and/or dryer has a nonlinear or curvilinear relative slot profile geometry. In one embodiment, the microwave dryer has at least one adjustable field modifier making it possible to change the geometry of the heater or dryer when drying different webs. In another embodiment, the microwave dryer provides more uniform drying of a web when the field modifier is adjusted in response to a sensed condition of the web. Finally, a method of microwave heating and/or drying a web achieves a uniform heating and/or drying profile.
Self-assembling multimeric nucleic acid constructs
Cantor, Charles R. (Boston, MA); Niemeyer, Christof M. (Bremen, DE); Smith, Cassandra L. (Boston, MA); Sano, Takeshi (Boston, MA); Hnatowich, Donald J. (Brookline, MA); Rusckowski, Mary (Southborough, MA)
1999-10-12T23:59:59.000Z
The invention is directed to constructs and compositions containing multimeric forms of nucleic acid. Multimeric nucleic acids comprise single-stranded nucleic acids attached via biotin to streptavidin and bound with a functional group. These constructs can be utilized in vivo to treat or identify diseased tissue or cells. Repeated administrations of multimeric nucleic acid compositions produce a rapid and specific amplification of nucleic acid constructs and their attached functional groups. For treatment purposes, functional groups may be toxins, radioisotopes, genes or enzymes. Diagnostically, labeled multimeric constructs may be used to identify specific targets in vivo or in vitro. Multimeric nucleic acids may also be used in nanotechnology and to create self-assembling polymeric aggregates such as membranes of defined porosity, microcircuits and many other products.
Self-assembling multimeric nucleic acid constructs
Cantor, Charles R. (Boston, MA); Niemeyer, Christof M. (Bremen, DE); Smith, Cassandra L. (Boston, MA); Sano, Takeshi (Boston, MA); Hnatowich, Donald J. (Brookline, MA); Rusckowski, Mary (Southborough, MA)
1996-01-01T23:59:59.000Z
The invention is directed to constructs and compositions containing multimeric forms of nucleic acid. Multimeric nucleic acids comprise single-stranded nucleic acids attached via biotin to streptavidin and bound with a functional group. These constructs can be utilized in vivo to treat or identify diseased tissue or cells. Repeated administrations of multimeric nucleic acid compositions produce a rapid and specific amplification of nucleic acid constructs and their attached functional groups. For treatment purposes, functional groups may be toxins, radioisotopes, genes or enzymes. Diagnostically, labeled multimeric constructs may be used to identify specific targets in vivo or in vitro. Multimeric nucleic acids may also be used in nanotechnology and to create self-assembling polymeric aggregates such as membranes of defined porosity, microcircuits and many other products.
Self-assembling multimeric nucleic acid constructs
Cantor, C.R.; Niemeyer, C.M.; Smith, C.L.; Sano, Takeshi; Hnatowich, D.J.; Rusckowski, M.
1996-10-01T23:59:59.000Z
The invention is directed to constructs and compositions containing multimeric forms of nucleic acid. Multimeric nucleic acids comprise single-stranded nucleic acids attached via biotin to streptavidin and bound with a functional group. These constructs can be utilized in vivo to treat or identify diseased tissue or cells. Repeated administrations of multimeric nucleic acid compositions produce a rapid and specific amplification of nucleic acid constructs and their attached functional groups. For treatment purposes, functional groups may be toxins, radioisotopes, genes or enzymes. Diagnostically, labeled multimeric constructs may be used to identify specific targets in vivo or in vitro. Multimeric nucleic acids may also be used in nanotechnology and to create self-assembling polymeric aggregates such as membranes of defined porosity, microcircuits and many other products. 5 figs.
PREDICTING TEMPERATURE BEHAVIOR IN CARBONATE ACIDIZING TREATMENTS
Tan, Xuehao
2010-01-16T23:59:59.000Z
is the temperature of injected acid. A program is developed to solve the energy balance equation numerically and the flow chart is shown below (Fig. 2.4). 17 Fig. 2.4?Flow chart for programming acid injection problem Start Time Step, p.................................................. 8 2.3 Core flow test results. Pore volumes to breakthrough as a function of injection rate. (Buijse and Glasbergen 2005) ........................................... 13 2.4 Flow chart for programming acid injection problem...
Carboxylic acid accelerated formation of diesters
Tustin, G.C.; Dickson, T.J.
1998-04-28T23:59:59.000Z
This invention pertains to accelerating the rate of formation of 1,1-dicarboxylic esters from the reaction of an aldehyde with a carboxylic acid anhydride or a ketene in the presence of a non-iodide containing a strong Bronsted acid catalyst by the addition of a carboxylic acid at about one bar pressure and between about 0 and 80 C in the substantial absence of a hydrogenation or carbonylation catalyst.
Acid rain information book. Draft final report
None
1980-12-01T23:59:59.000Z
Acid rain is one of the most widely publicized environmental issues of the day. The potential consequences of increasingly widespread acid rain demand that this phenomenon be carefully evaluated. Reveiw of the literature shows a rapidly growing body of knowledge, but also reveals major gaps in understanding that need to be narrowed. This document discusses major aspects of the acid rain phenomenon, points out areas of uncertainty, and summarizes current and projected research by responsible government agencies and other concerned organizations.
Relative reactivities of solid benzoic acids
Warwas, Edwin James
1967-01-01T23:59:59.000Z
REACTIVITIES OF SOLID BENZOIC ACIDS (January 1967) Edwin James Warwas B. S. , Southwest Texas State College Directed by: Dr. C. K. Hancock and Dr. E. A. Meyers The reactions of solid benzoic acid (BZAH) and nine m- or p- substituted benzoic acids (RBZAH... of extending this study to include other solids where the effect of substituents would be predicted by Harnmett o- constants is discussed. 111 ACKNOWLEDGMENTS I gratefully express my appreciation to: Dr. C. K, Hancock and Dr. E. A. Meyers...
Acid Doped Membranes for High Temperature PEMFC
Broader source: Energy.gov [DOE]
Presentation on Acid Doped Membranes for High Temperature PEMFC to the High Temperature Membrane Working Group, May 25, 2004 in Philadelphia, PA.
Carbonic Acid Shows Promise in Geology, Biology
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Though it garners few public headlines, carbonic acid, the hydrated form of carbon dioxide, is critical to both the health of the atmosphere and the human body. However,...
Investigating intermediates in 6-methylsalicylic acid biosynthesis
Potter, Helen Katherine
2011-07-12T23:59:59.000Z
.3.1 Chlorination ............................................................................................ 174 A2.3.2 Coupling of amino acids.......................................................................... 174 A2.3.3 Protecting groups...
Organic acid-tolerant microorganisms and uses thereof for producing organic acids
Pfleger, Brian Frederick; Begemann, Matthew Brett
2014-05-06T23:59:59.000Z
Organic acid-tolerant microorganisms and methods of using same. The organic acid-tolerant microorganisms comprise modifications that reduce or ablate AcsA activity or AcsA homolog activity. The modifications increase tolerance of the microorganisms to such organic acids as 3-hydroxypropionic acid (3HP), acrylic acid, and propionic acid. Further modifications to the microorganisms such as increasing expression of malonyl-CoA reductase and/or acetyl-CoA carboxylase provide or increase the ability of the microorganisms to produce 3HP. Methods of generating an organic acid with the modified microorganisms are provided. Methods of using acsA or homologs thereof as counter-selectable markers include replacing acsA or homologs thereof in cells with genes of interest and selecting for the cells comprising the genes of interest with amounts of organic acids effective to inhibit growth of cells harboring acsA or the homologs.
The East Penn process for recycling sulfuric acid from lead-acid batteries
Leiby, R.; Bricker, M. [East Penn Manufacturing Co., Inc., Lyon Station, PA (United States); Spitz, R. [Spitz (R.), Holbrook, MA (United States)
1995-12-31T23:59:59.000Z
Prior to March 1992, the only component of the lead-acid battery that was not recycled by East Penn Manufacturing Company was the sulfuric acid electrolyte. This acid was unusable in new batteries because the iron level was found to exceed new product specifications. The development of a liquid ion exchange process to remove the iron from the acid allows East Penn to currently recover over three million gallons of sulfuric acid annually. The process is based upon the use of an iron selective liquid ion exchange material or solvent to extract iron from the sulfuric acid electrolyte followed by regeneration of the solvent. Equilibrium and kinetic data for the extraction and regeneration steps were collected in order to scale up the process to commercial scale. An electrochemical process for the treatment of the acid used in the regeneration step was also developed which significantly reduces the volume of strip acid required in the process.
A method to attenuate U(VI) mobility in acidic waste plumes using humic acids
Wan, J.
2011-01-01T23:59:59.000Z
base properties of a goethite surface model: A theoreticalcomplexation of U(VI) on goethite (alpha-FeOOH). Geochim.acid and humic-acid on goethite, gibbsite and imogolite. J.
Evaluation of acid fracturing based on the "acid fracture number" concept
Alghamdi, Abdulwahab
2006-08-16T23:59:59.000Z
Acid fracturing is one of the preferred methods to stimulate wells in carbonate reservoirs. It consists of injecting an acid solution at high enough pressure to break down the formation and to propagate a two-wing crack ...
Effects of Acid Additives on Spent Acid Flowback through Carbonate Cores
Nasir, Ehsaan Ahmad
2012-07-16T23:59:59.000Z
these challenges, different chemicals, or additives, are added to the acid solution such as corrosion inhibitors and iron control agents. These additives may change the relative permeability of the spent acid, and formation wettability, and may either hinder...
Numerical-based Study of Spent Acid Blockage Damage in Acidized Gas Wells
Zhang, Qi
2013-12-04T23:59:59.000Z
, especially in lower permeability regions where capillary forces are relatively high. This research presents studies that investigate the spent-acid damage in wormhole region of acid-stimulated gas wells. We start the investigation with lab-scale coreflood...
Non-essential amino acid metabolism in rats
Crooks, James Darrell
1971-01-01T23:59:59.000Z
-bound amino acids were studied' The amino acids studied were asparagine, aspartic acid, glutamine, glutamic acid, glycine, alanine, arginine, and praline. Growth rates of rats increased with increased levels of glutamate in the diet. Effects of level... of dietary glutamic acid on endogenous pool size;, of the free amino acids were studied. No consistent patterns were observed. The pool sizes of all but four of the free amino acids increased after the ingestion of a meal. Glucose levels decreased...
Arthur, R. Martin
Caused by Changes in Cardiac Geometry Due to Diabetes and ObesityChanges in Cardiac Geometry Due to Diabetes and Obesity AbstractAbstract Purpose: Myocardial disease is common in the diabetic, including elevated risk for myocardial infarction, heart failure, and sudden cardiac death. Both diabetes and obesity
Condat, Laurent
gipsa-lab AGPiG ARCHITECTURE GEOMETRIE PERCEPTION IMAGES GESTES Equipe AGPiG-Architecture géométrie programmation parallèle Gestion dynamique d'architecture THÉMATIQUES RESPONSABLES Dominique ATTALI Dominique vidéos Mesures de courbure Suivi d'activités Identification d'expressions Attention visuelle Architecture
Jet-like circulations occur in the `simple' geometries of gas planets and Earth's
#12;Jet-like circulations occur in the `simple' geometries of gas planets and Earth's liquid The Jet Stream Conundrum Baldwin, Rhines, Huang & McIntyre, Nature 2007 #12;For Earth's oceans, density and jets Tracks of fast sea- surface drifters, Jakobsen 1994 #12;channels & atmospheres: PV stirring
Bertozzi, Andrea L.
Fourth order partial differential equations on general geometries John B. Greer a,*, Andrea L surfaces, J. Comput. Phys. 174 (2) (2001) 759780] to fourth order PDEs including the Cahn and large stencil sizes, are shared by standard fourth order equations in Euclidean domains, but others
Soatto, Stefano
Fourth Order Partial Differential Equations on General Geometries John B. Greer Andrea L differential equations on implicit surfaces (Bertalm´io, Cheng, Osher, and Sapiro 2001) to fourth order PDEs, such as time-stepping restrictions and large stencil sizes, are shared by standard fourth order equations
Trace Formula in Noncommutative Geometry and the Zeros of the Riemann Zeta Function
Connes, Alain
Trace Formula in Noncommutative Geometry and the Zeros of the Riemann Zeta Function Alain CONNES interpretation of the explicit formulas of number theory as a trace formula on the noncommutative space of Adele classes. This reduces the Riemann hypothesis to the validity of the trace formula and eliminates
Amini, Noushin
2012-02-14T23:59:59.000Z
through the core of an annular pebble bed VHTR. The complex geometry of the core and the highly turbulent nature of the coolant flow passing through the gaps of fuel pebbles make this case quite challenging. In this experiment, a high frequency Hot Wire...
Conical geometry for sagittal focusing as applied to X rays from synchrotrons
Ice, G.E.; Sparks, C.J.
1993-06-01T23:59:59.000Z
The authors describe a method for simultaneously focusing and monochromatization of X rays from a fan of radiation having up to 15 mrad divergence in one dimension. This geometry is well suited to synchrotron radiation sources at magnifications of one-fifth to two and is efficient for X-ray energies between 3 and 40 keV (0.48 and 6.4 fJ). The method uses crystals bent to part of a cone for sagittal focusing and allows for the collection of a larger divergence with less mixing of the horizontal into the vertical divergence than is possible with X-ray mirrors. They describe the geometry required to achieve the highest efficiency when a conical crystal follows a flat crystal in a nondispersive two-crystal monochromator. At a magnification of one-third, the geometry is identical to a cylindrical focusing design described previously. A simple theoretical calculation is shown to agree well with ray-tracing results. Minimum aberrations are observed at magnifications near one. Applications of the conical focusing geometry to existing and future synchrotron radiation facilities are discussed.
On bicycle tire tracks geometry, hatchet planimeter, Menzin's conjecture and oscillation
Tabachnikov, Sergei
On bicycle tire tracks geometry, hatchet planimeter, Menzin's conjecture and oscillation of unicycle tracks Mark Levi and Serge Tabachnikov April 13, 2008 Abstract The model of a bicycle is a unit wheel is fixed on the bicycle frame); the same model describes the hatchet planimeter. The trajectory
Fundamenta Informaticae 46 (2001) 145158 145 A Categorical Axiomatisation of Region-Based Geometry
Bennett, Brandon
2001-01-01T23:59:59.000Z
-Based Geometry£ Brandon BennettÝ School of Computing, University of Leeds, Leeds LS2 9JT, UK Ö Ò ÓÒ ÓÑÔºÐ ×º º suggestions of Anthony G. Cohn, Paolo Torrini and an anonymous reviewer are also acknowledged. ÝAddress for correspondence: School of Computing, University of Leeds, Leeds LS2 9JT, UK 1 This is really a theory of `regions
Fundamenta Informaticae 46 (2001) 145--158 145 A Categorical Axiomatisation of RegionBased Geometry
Leeds, University of
2001-01-01T23:59:59.000Z
Based Geometry #3; Brandon Bennett y School of Computing, University of Leeds, Leeds LS2 9JT, UK brandon@comp.leeds suggestions of Anthony G. Cohn, Paolo Torrini and an anonymous reviewer are also acknowledged. y Address for correspondence: School of Computing, University of Leeds, Leeds LS2 9JT, UK 1 This is really a theory of `regions
Siminovitch, M.
1998-02-10T23:59:59.000Z
A novel design is described for a compact fluorescent lamp, including a lamp geometry which will increase light output and efficacy of the lamp in a base down operating position by providing horizontal and vertical insulating septums positioned in the ballast compartment of the lamp to provide a cooler coldspot. Selective convective venting provides additional cooling of the ballast compartment. 9 figs.
Geometry and seismic properties of the subducting Cocos plate in central Mexico
Jackson, Jennifer M.
in central Mexico Y. Kim,1 R. W. Clayton,1 and J. M. Jackson1 Received 31 August 2009; revised 22 December of the interface of the Cocos plate beneath central Mexico are determined from the receiver functions (RFs. Jackson (2010), Geometry and seismic properties of the subducting Cocos plate in central Mexico, J
The excess free energy as a function of R for the pore and disk geometries.
Zhou, Jiajia
: National Basic Research Program of China (2011CB605700) National Natural Science Foundation of ChinaThe excess free energy as a function of R for the pore and disk geometries. The line tension (20874019, 20990231, 21104010) Natural Sciences and Engineering Research Council of Canada Deutsche
Douglas, David R.; Neil, George R.
2005-04-26T23:59:59.000Z
A particle beam recirculated chicane geometry that, through the inducement of a pair of 180 degree bends directed by the poles of a pair of controllable magnetic fields allows for variation of dipole position, return loop radii and steering/focussing, thereby allowing the implementation of independent variation of path length and momentum compaction.
THE GEOMETRY OF EMBEDDED CONSTANT MEAN CURVATURE TORI IN THE 3-SPHERE VIA INTEGRABLE SYSTEMS
Hauswirth, Laurent
THE GEOMETRY OF EMBEDDED CONSTANT MEAN CURVATURE TORI IN THE 3-SPHERE VIA INTEGRABLE SYSTEMS L Alexandrov embedded cylinders is explicitly determined. We prove that all embedded cmc tori in the 3-sphere are surfaces of revolution using a combination of integrable systems methods and geometric analysis techniques
Geometry Optimization with QM/MM, ONIOM, and Other Combined Methods. I. Microiterations
Schlegel, H. Bernhard
Geometry Optimization with QM/MM, ONIOM, and Other Combined Methods. I. Microiterations Abstract: Hybrid energy methods such as QM/MM and ONIOM, that combine different levels of theory into one of theory and the larger, remaining region treated by an inexpensive method such as molecular mechanics (MM
A comparative study of the i-mode in stellarator and tokamak geometries
A comparative study of the i-mode in stellarator and tokamak geometries J. Anderson, T. Rafiq, M the anomalous transport in present tokamaks. An advanced fluid model is applied for the ion physics whereas and the perpendicular wavenumber( )k on different magnetic surfaces in stellarator and tokamak equilibria. Quantitative
Alice Boner and the Geometry of Temple Cave Art of India
Moody, Robert Vaughan
Alice Boner and the Geometry of Temple Cave Art of India Robert V. Moody Department of Mathematical 1936 until 1978. Her passion was oriental art, particularly the art of India. India's rich cultural history goes back at least three millennia, although sadly much of its art is lost: in India the climate
The Geometry of Intersecting Tubes Applied to Controlling a Robotic Welding Torch
Stockie, John
The Geometry of Intersecting Tubes Applied to Controlling a Robotic Welding Torch John M. Stockie Abstract: The question of how to control a robotic welding torch to trace the joint between two cylindrical that increase its applicability to more advanced mathematics courses. Keywords: pipe welding, cylinders
Solar Cooling Using Variable Geometry Ejectors Centre for Sustainable Energy Systems
Solar Cooling Using Variable Geometry Ejectors M. Dennis Centre for Sustainable Energy Systems the savings in electricity consumption must be compared with the additional cost of the solar collector-mail:Mike.Dennis@anu.edu.au ABSTRACT Solar heat driven cooling systems are an attractive concept. The need for cooling is associated
On Path diagrams and Stirling permutations Institut fur Diskrete Mathematik und Geometrie
Kuba, Markus
On Path diagrams and Stirling permutations M. Kuba Institut fÂ¨ur Diskrete Mathematik und Geometrie of this article is to extend the notion of local types to k-Stirling permutations, establish a relation diagrams. In the case of the classical Stirling permutations, we give an alternative continued fraction
On Path diagrams and Stirling permutations Institut fur Diskrete Mathematik und Geometrie
Kuba, Markus
On Path diagrams and Stirling permutations M. Kuba Institut fÂ¨ur Diskrete Mathematik und Geometrie is to introduce the notion of local types in k-Stirling permutations, to relate these local types with nodes types, Stirling permutations, Increasing trees, local types, formal power series 2000 Mathematics Subject
Differential Geometry and its Applications 3 (1993) 265-284 North-Holland
Tabachnikov, Sergei
1993-01-01T23:59:59.000Z
of Lagrangian and Legendrian 2-web Serge Tabachnikov Department of Mathematical Sciences, University of Arkansas Tabachnikov S., Geometry of Lagrangian and Legendrian 2-web, Diff. Geom. Appl. 3 (1993) 265-284. Abstract: Four types of web structures are considered: a I-web with Lagrangian leaves in a symplectic manifold
Eurographics Symposium on Geometry Processing 2011 Mario Botsch and Scott Schaefer
Amenta, Nina
/Image Generation--Line and curve generation, I.3.5 [Computer Graphics]: Computational Geometry and Object Modeling of the concept shape. While surfaced sketches are generally not suitable as production specifications or fi- nal that automates a significant portion of the s
Improvement of PNP Problem Computational Efficiency For Known Target Geometry of Cubesats
Hafer, William
2012-07-16T23:59:59.000Z
processing burden of the PNP solution by taking advantage of the known target geometry. We did this by considering a specific P3P solver and a specific point-cloud correspondence (PCC) solver for disambiguating/improving the estimate, and modifying them both...
EFFECTS OF CHAMBER GEOMETRY AND GAS PROPERTIES ON HYDRODYNAMIC EVOLUTION OF IFE Zoran Dragojlovic1
Najmabadi, Farrokh
-rays and ions travel through the chamber and deposit some of their energy in the chamber background gas; the effects of various heat sources and transfer mechanisms such as photon and ion heat deposition and chamberEFFECTS OF CHAMBER GEOMETRY AND GAS PROPERTIES ON HYDRODYNAMIC EVOLUTION OF IFE CHAMBERS Zoran
vol. 172, no. 5 the american naturalist november 2008 A Geometry of Regulatory Scaling
Cheng, Ken
vol. 172, no. 5 the american naturalist november 2008 A Geometry of Regulatory Scaling Ken Cheng,1 Stephen J. Simpson,2,* and David Raubenheimer3 1. Centre for the Integrative Study of Animal Behaviour, Macquarie University, Sydney, New South Wales 2109, Australia; 2. School of Biological Sciences and Centre
Curved carbon nanotubes: From unique geometries to novel properties and peculiar applications
Simons, Jack
Curved carbon nanotubes: From unique geometries to novel properties and peculiar applications and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China 2 Department Incorporating pentagons and heptagons into the hexagonal networks of pristine carbon nanotubes (CNTs) can form
Grujicic, Mica
2004-01-01T23:59:59.000Z
according to the type of membrane (polymer electrolyte membrane fuel cells, solid oxide fuel cells, molten carbonate fuel cells, etc.) they use. One of the most promising fuel cells are the so-called poly- mer geometry optimization in polymer electrolyte membrane (PEM) fuel cells M. Grujicic, C.L. Zhao, K
Broughton, S. Allen
Introduction Basic Structure Symmetries Labelling and Potential Energy Future Work Geometry from by NSF Award DMR-0304487 #12;Introduction Basic Structure Symmetries Labelling and Potential Energy and Potential Energy local potential energy terms 5 Future Work #12;Introduction Basic Structure Symmetries
Pansu, Pierre
Metric problems in sub-Riemannian geometry Gromov's dimension approach to the H¨older equivalence problem Gromov's cochain approach to the H¨older equivalence problem Rumin's complex Quasisymmetric H¨older-Lipschitz equivalence problem Differential forms and the H¨older equivalence problem P. Pansu September 1st, 2014 P
ON THE INFLUENCE OF THE GEOMETRY ON SKIN EFFECT IN ELECTROMAGNETISM
Paris-Sud XI, Université de
ON THE INFLUENCE OF THE GEOMETRY ON SKIN EFFECT IN ELECTROMAGNETISM GABRIEL CALOZ, MONIQUE DAUGE) 1053-1068" DOI : 10.1016/j.cma.2010.11.011 #12;2 GABRIEL CALOZ, MONIQUE DAUGE, ERWAN FAOU, VICTOR P of the conducting body surface is larger and here the sign of the curvature has a major influence, which means
ON THE INFLUENCE OF THE GEOMETRY ON SKIN EFFECT IN ELECTROMAGNETISM
ON THE INFLUENCE OF THE GEOMETRY ON SKIN EFFECT IN ELECTROMAGNETISM GABRIEL CALOZ, MONIQUE DAUGE, MONIQUE DAUGE, ERWAN FAOU, VICTOR PÂ´ERON suitable skin depth function is introduced on the interface Â and here the sign of the curvature has a major influence, which means that the skin depth is larger
ON THE INFLUENCE OF THE GEOMETRY ON SKIN EFFECT IN ELECTROMAGNETISM
Dauge, Monique
ON THE INFLUENCE OF THE GEOMETRY ON SKIN EFFECT IN ELECTROMAGNETISM GABRIEL CALOZ, MONIQUE DAUGE #12;2 GABRIEL CALOZ, MONIQUE DAUGE, ERWAN FAOU, VICTOR PÂ´ERON electromagnetic field at high is larger Â and here the sign of the curvature has a major influence, which means that the skin depth
ON THE INFLUENCE OF THE GEOMETRY ON SKIN EFFECT IN ELECTROMAGNETISM
Faou, Erwan
ON THE INFLUENCE OF THE GEOMETRY ON SKIN EFFECT IN ELECTROMAGNETISM GABRIEL CALOZ, MONIQUE DAUGE conductivity are proved in [3], whereas in the note [4] a 1 #12;2 GABRIEL CALOZ, MONIQUE DAUGE, ERWAN FAOU of the curvature has a major influence, which means that the skin depth is larger in convex than in concave
arXiv:condmat/0002194 Geometry, Statistics and Asymptotics of Quantum Pumps
Voloch, Felipe
arXiv:condÂmat/0002194 v2 31 May 2000 Geometry, Statistics and Asymptotics of Quantum Pumps J. EÂ¨uttiker et. al. (BPT) relating the adiabatically pumped current to the S matrix and its (time) derivatives. We relate the charge in BPT to Berry's phase and the corresponding Brouwer pumping formula
Effects of geometry and impurities on quantum rings in magnetic fields RID D-3014-2009
Aichinger, M.; Chin, Siu A.; Krotscheck, E.; Rasanen, E.
2006-01-01T23:59:59.000Z
We investigate the effects of impurities and changing ring geometry on the energetics of quantum rings under different magnetic field strengths. We show that as the magnetic field and/or the electron number are/is increased, both the quasiperiodic...
Technical Report TR-2013-3 Studying the Effect of Powder Geometry on the Selective Laser
Negrut, Dan
Technical Report TR-2013-3 Studying the Effect of Powder Geometry on the Selective Laser Sintering to model the Selective Laser Sintering (SLS) layering process. SLS is an additive manufacturing process;1 Introduction Additive manufacturing processes such as Selective Laser Sintering (SLS) allow 3D parts
Cost of Antibiotic Resistance and the Geometry of Ana Sousa,*,1
Gordo, Isabel
implications to understanding the spread and maintenance of antibiotic resistance in bacteria. Key wordsCost of Antibiotic Resistance and the Geometry of Adaptation Ana Sousa,*,1 Sara Magalha~es,2 causes antibiotic resistance. Using a system with multiple molecular markers, we estimate
Ionospheric Threat Mitigation by Geometry Screening in Ground-Based Augmentation Systems
Stanford University
Ionospheric Threat Mitigation by Geometry Screening in Ground-Based Augmentation Systems Jiyun Lee observed during severe ionospheric storms pose potential threats to the integrity of the Ground threats, because ionospheric gradients are not observable to the ground monitor if they impact
Compact formulas for guiding-center orbits in axisymmetric tokamak geometry
Brizard, Alain J. [Department of Chemistry and Physics, Saint Michael's College Colchester, Vermont 05439 (United States)
2011-02-15T23:59:59.000Z
Compact formulas for trapped-particle and passing-particle guiding-center orbits in axisymmetric tokamak geometry are given in terms of the Jacobi elliptic functions and complete elliptic integrals. These formulas can find applications in bounce-center kinetic theory as well as guiding-center Fokker-Planck kinetic theory.
Error of the network approximation for densely packed composites with irregular geometry
Novikov, Alexei
properties such as the effective conductivity or the effective dielectric constant of composite materials the concentration of the filling inclusions is high is particularly relevant to polymer/ceramic composites, becauseError of the network approximation for densely packed composites with irregular geometry Leonid
Gypsum Effect on the Aggregate Size and Geometry of Three Sodic Soils Under Reclamation
Ahmad, Sajjad
Gypsum Effect on the Aggregate Size and Geometry of Three Sodic Soils Under Reclamation I. Lebron- tion of clays occurs because of the repulsion of similarReclamation of sodic soils is imperative in many areas where deteri- charged clay platelets and the ability of the soil solutionoration of land
Acoustically driven cavitation cluster collapse in planar geometry Ivan van der Kroon,1
Ohl, Claus-Dieter
in hydrodynamic cavitation. Their damaging potential is explained with a collective cavi- tation collapse front in spallation neutron sources 14 . In hydrodynamics cavitation, the positions of the cavities in the clusterAcoustically driven cavitation cluster collapse in planar geometry Ivan van der Kroon,1 Pedro A
Rohrer, Gregory S.
-boundary energies is to measure the geometry of the thermal grooves that form where the boundaries intersect a free is the excess free energy per unit area of the ith interface; ti the unit vector that lies in the ith interface) reduces to: gb s = 2 cos s 2 (2) In Eq. (2), the ratio of the grain-boundary excess free energy
Nair, Sankar
Geometry of nanopore devices fabricated by electron beam lithography: Simulations and experimental 2013 Keywords: Nanopore Simulation Electron beam lithography Penelope Nanotechnology Monte Carlo a b be fabricated by electron beam lithography (EBL) with high density (on the order of 10 devices per cm2
TORIC GEOMETRY AND THE SEMPLE-NASH MODIFICATION PEDRO D. GONZALEZ PEREZ AND BERNARD TEISSIER
González Pérez, Pedro Daniel
TORIC GEOMETRY AND THE SEMPLE-NASH MODIFICATION PEDRO D. GONZ´ALEZ P´EREZ AND BERNARD TEISSIER. In the second part this is used to show that iterating the Semple-Nash modification or its characteristic]. If the field is of characteristic zero, this blowing-up is isomor- phic to the Semple-Nash modification. Recall
Evalutaion of Multi-Stage Sandstone Acidizing Uging an Organic Mud Acid and a Clay Stabalizer
Sakipour, Armin
2013-05-29T23:59:59.000Z
.) at a flow rate of 4 cm^3/ min and temperature of 140°F. A mixture of formic acid and HF was used as an organic mud acid. Preflush of hydrochloric and formic acid was employed to remove carbonate minerals. Bandera sandstone cores contain a considerable...
Amino acid analogs for tumor imaging
Goodman, M.M.; Shoup, T.
1998-10-06T23:59:59.000Z
The invention provides novel amino acid compounds of use in detecting and evaluating brain and body tumors. These compounds combine the advantageous properties of 1-amino-cycloalkyl-1-carboxylic acids, namely, their rapid uptake and prolonged retention in tumors with the properties of halogen substituents, including certain useful halogen isotopes including fluorine-18, iodine-123, iodine-125, iodine-131, bromine-75, bromine-76, bromine-77 and bromine-82. In one aspect, the invention features amino acid compounds that have a high specificity for target sites when administered to a subject in vivo. Preferred amino acid compounds show a target to non-target ratio of at least 5:1, are stable in vivo and substantially localized to target within 1 hour after administration. An especially preferred amino acid compound is [{sup 18}F]-1-amino-3-fluorocyclobutane-1-carboxylic acid (FACBC). In another aspect, the invention features pharmaceutical compositions comprised of an {alpha}-amino acid moiety attached to either a four, five, or a six member carbon-chain ring. In addition, the invention features analogs of {alpha}-aminoisobutyric acid.
Amino acid analogs for tumor imaging
Goodman, M.M.; Shoup, T.
1998-09-15T23:59:59.000Z
The invention provides novel amino acid compounds of use in detecting and evaluating brain and body tumors. These compounds combine the advantageous properties of 1-amino-cycloalkyl-1-carboxylic acids, namely, their rapid uptake and prolonged retention in tumors with the properties of halogen substituents, including certain useful halogen isotopes including fluorine-18, iodine-123, iodine-125, iodine-131, bromine-75, bromine-76, bromine-77 and bromine-82. In one aspect, the invention features amino acid compounds that have a high specificity for target sites when administered to a subject in vivo. Preferred amino acid compounds show a target to non-target ratio of at least 5:1, are stable in vivo and substantially localized to target within 1 hour after administration. An especially preferred amino acid compound is [{sup 18}F]-1-amino-3-fluorocyclobutane-1-carboxylic acid (FACBC). In another aspect, the invention features pharmaceutical compositions comprised of an {alpha}-amino acid moiety attached to either a four, five, or a six member carbon-chain ring. In addition, the invention features analogs of {alpha}-aminoisobutyric acid.
Amino acid analogs for tumor imaging
Goodman, Mark M. (Atlanta, GA); Shoup, Timothy (Decatur, GA)
1998-09-15T23:59:59.000Z
The invention provides novel amino acid compounds of use in detecting and evaluating brain and body tumors. These compounds combine the advantageous properties of 1-amino-cycloalkyl-1-carboxylic acids, namely, their rapid uptake and prolonged retention in tumors with the properties of halogen substituents, including certain useful halogen isotopes including fluorine-18, iodine-123, iodine-125, iodine-131, bromine-75, bromine-76, bromine-77 and bromine-82. In one aspect, the invention features amino acid compounds that have a high specificity for target sites when administered to a subject in vivo. Preferred amino acid compounds show a target to non-target ratio of at least 5:1, are stable in vivo and substantially localized to target within 1 hour after administration. An especially preferred amino acid compound is ›.sup.18 F!-1-amino-3-fluorocyclobutane-1-carboxylic acid (FACBC). In another aspect, the invention features pharmaceutical compositions comprised of an .alpha.-amino acid moiety attached to either a four, five, or a six member carbon-chain ring. In addition, the invention features analogs of .alpha.-aminoisobutyric acid.
Amino acid analogs for tumor imaging
Goodman, Mark M. (Atlanta, GA); Shoup, Timothy (Decatur, GA)
1998-10-06T23:59:59.000Z
The invention provides novel amino acid compounds of use in detecting and evaluating brain and body tumors. These compounds combine the advantageous properties of 1-amino-cycloalkyl-1-carboxylic acids, namely, their rapid uptake and prolonged retention in tumors with the properties of halogen substituents, including certain useful halogen isotopes including fluorine-18, iodine-123, iodine-125, iodine-131, bromine-75, bromine-76, bromine-77 and bromine-82. In one aspect, the invention features amino acid compounds that have a high specificity for target sites when administered to a subject in vivo. Preferred amino acid compounds show a target to non-target ratio of at least 5:1, are stable in vivo and substantially localized to target within 1 hour after administration. An especially preferred amino acid compound is ›.sup.18 F!-1-amino-3-fluorocyclobutane-1-carboxylic acid (FACBC). In another aspect, the invention features pharmaceutical compositions comprised of an .alpha.-amino acid moiety attached to either a four, five, or a six member carbon-chain ring. In addition, the invention features analogs of .alpha.-aminoisobutyric acid.
Modeling of Acid Fracturing in Carbonate Reservoirs
Al Jawad, Murtada s
2014-06-05T23:59:59.000Z
_(2)(g) + H_(2)O (l) An acid balance equation is used to draw the concentration profile of the acid and to account for the quantity of rock dissolved. An algorithm is developed for this process to generate the final conductivity distribution after...
Nitrates and Prussic Acid in Forages
Provin, Tony; Pitt, John L.
2003-01-06T23:59:59.000Z
When nitrates and prussic acid accumulate in forage, the feed may not be safe for livestock consumption. Learn the symptoms of nitrate and prussic acid poisoning and which plants are most likely to pose a risk to livestock. Also learn sampling...
Savage, Heather M.
in the suprajacent fold shapes. Differences between the kinematic and mechanical fault-fold relationships highlight rights reserved. Keywords: Fault-bend folding; Mechanical models; Kinematic models; Fault geometry and mechanical models have been used to analyze fault-cored folds. Kinematic models, which balance the geometry
Aslaksen, Helmer
#12;Contents 1. An Introduction to Architecture and Geometry 2 2. The Basics Forms and the Methods;1. Introduction Architecture and geometry are symbiotic in nature, virtually an inseparable pair. Understanding and architectural design is evident throughout history. The angles of inclination of the walls of the Egyptian
McDonald, Kirk
IDS120h GEOMETRY WITH MODIFIED Hg POOL VESSEL SIMULATIONS FOR 60% W + 40% He SHIELDING (P12 'POINT POWER DISTRIBUTION. Nicholas Souchlas, PBL (1/24/2012) 1 #12;IDS120hm: (m IS FOR) modified Hg pool 'POINT'). >GAUSSIAN PROFILE: x = y = 0.12 cm. 2 #12;3 IDS120hm GEOMETRY = IDS120h WITH MODIFIED Hg POOL
Wahle, Andreas
Geometry and Catheter Position on Dose Delivery in Intracoronary Brachytherapy Andreas Wahle, Senior Member--In-stent restenosis is commonly observed in coronary arteries after intervention. Intravascular brachytherapy has been models for brachytherapy with beta () radiation neglect vessel geometry as well as the position
Long, Marshall B.
April 1, 2000 / Vol. 25, No. 7 / OPTICS LETTERS 457 Effect of light-collection geometry is valid only when incoming rays are parallel, whereas most practical optical setups used for emission angle. A ray-tracing simulation was performed to aid in understanding how optical collection geometry
Isliker, Heinz
Integrable perturbed magnetic fields in toroidal geometry: An exact analytical flux surface label, 056114 (2012); 10.1063/1.3694842 Driving toroidally asymmetric current through the tokamak scrape-off in toroidal geometry: An exact analytical flux surface label for large aspect ratio N. Kallinikos, H. Isliker
Toward the modeling of mucus draining from the human lung: role of the geometry of the airway tree
Mauroy, Benjamin - Laboratoire Matière et Systèmes Complexes, Université Paris 7
Toward the modeling of mucus draining from the human lung: role of the geometry of the airway tree.1088/1478-3975/8/5/056006 Toward the modeling of mucus draining from the human lung: role of the geometry of the airway tree, then therapeutic draining of mucus plays a critical role to keep mucus levels in the lungs acceptable
Birge, Norman
valve geometry Charles E. Moreaua Department of Physics, Albion College, Albion, Michigan 49224 Ion C exchange-biased spin valve geometry that inserts a Ni "spoiler" layer into a Py/Cu/Py spin valve. Fits In the context of ferromagnetic/nonmagnetic F/N multilayers or spin valves, the size of the giant
Experimental Study of Acid Fracture Conductivity of Austin Chalk Formation
Nino Penaloza, Andrea
2013-05-01T23:59:59.000Z
Acid fracture conductivity and the effect of key variables in the etching process during acid fracturing can be assessed at the laboratory scale. This is accomplished by using an experimental apparatus that simulates acid injection fluxes comparable...
Diagnosis of Acid Placement from Downhole Temperature Measurements
Tan, Xuehao
2012-10-19T23:59:59.000Z
Placement of a sufficient volume of acid in all desired zones is critical for a successful acid stimulation treatment. Particularly in thick, highly heterogeneous carbonate formations, the acid distribution is crucial for optimal stimulation results...
Studies of metaphosphate acids and metaphosphate anhydrides in aprotic media
Chakarawet, Khetpakorn
2015-01-01T23:59:59.000Z
The chemistry of metaphosphate acids has historically been studied in aqueous media, where acid-catalyzed hydrolysis and solvent leveling effects of these strong acids have prevented their observations and rigorous ...
Phenolic acid esterases, coding sequences and methods
Blum, David L. (San Diego, CA); Kataeva, Irina (Athens, GA); Li, Xin-Liang (Athens, GA); Ljungdahl, Lars G. (Athens, GA)
2002-01-01T23:59:59.000Z
Described herein are four phenolic acid esterases, three of which correspond to domains of previously unknown function within bacterial xylanases, from XynY and XynZ of Clostridium thermocellum and from a xylanase of Ruminococcus. The fourth specifically exemplified xylanase is a protein encoded within the genome of Orpinomyces PC-2. The amino acids of these polypeptides and nucleotide sequences encoding them are provided. Recombinant host cells, expression vectors and methods for the recombinant production of phenolic acid esterases are also provided.
Chemical Additive Selection in Matrix Acidizing
Weidner, Jason 1981-
2011-05-09T23:59:59.000Z
HCl Hydrochloric Acid HF Hydrofluoric Acid Hg Mercury HgS Mercury Sulfide Mgal 1000 Gallons Mn Manganese NORM Naturally Occurring Radioactive Material SiO2 Quartz; Silica Si(OH)4 Silica Gel SRB Sulfate Reducing Bacteria Tr Reservoir...Mg(CO3)2 + 4HCl ? 2CO2 + 2H2O + CaCl2 + HgCl2 Fig. 1?The balanced chemical equations show how hydrochloric acid (HCl) reacts with calcite (CaCO3) and dolomite (CaMg(CO3)2). Note that both reactions result in the production of carbon dioxide (CO2...
Chip-based sequencing nucleic acids
Beer, Neil Reginald
2014-08-26T23:59:59.000Z
A system for fast DNA sequencing by amplification of genetic material within microreactors, denaturing, demulsifying, and then sequencing the material, while retaining it in a PCR/sequencing zone by a magnetic field. One embodiment includes sequencing nucleic acids on a microchip that includes a microchannel flow channel in the microchip. The nucleic acids are isolated and hybridized to magnetic nanoparticles or to magnetic polystyrene-coated beads. Microreactor droplets are formed in the microchannel flow channel. The microreactor droplets containing the nucleic acids and the magnetic nanoparticles are retained in a magnetic trap in the microchannel flow channel and sequenced.
Geometry of N=1 Super Yang-Mills Theory in Curved Superspace
A. Konechny; A. Schwarz
1996-09-12T23:59:59.000Z
We give a new description of N=1 super Yang-Mills theory in curved superspace. It is based on the induced geometry approach to a curved superspace in which it is viewed as a surface embedded into C(4|2). The complex structure on C(4|2) supplied with a standard volume element induces a special Cauchy-Riemann (SCR)-structure on the embedded surface. We give an explicit construction of SYM theory in terms of intrinsic geometry of the superspace defined by this SCR-structure and a CR-bundle over the superspace. We write a manifestly SCR-covariant Lagrangian for SYM coupled with matter. We also show that in a special gauge our formulation coincides with the standard one which uses Lorentz connections. Some useful auxiliary results about the integration over surfaces in superspace are obtained.
Bounds on the interior geometry and pressure profile of static fluid spheres
Damien Martin; Matt Visser
2003-06-10T23:59:59.000Z
It is a famous result of relativistic stellar structure that (under mild technical conditions) a static fluid sphere satisfies the Buchdahl--Bondi bound 2M/R <= 8/9; the surprise here being that the bound is not 2M/R <= 1. In this article we provide further generalizations of this bound by placing a number of constraints on the interior geometry (the metric components), on the local acceleration due to gravity, on various combinations of the internal density and pressure profiles, and on the internal compactness 2m(r)/r of static fluid spheres. We do this by adapting the standard tool of comparing the generic fluid sphere with a Schwarzschild interior geometry of the same mass and radius -- in particular we obtain several results for the pressure profile (not merely the central pressure) that are considerably more subtle than might first be expected.
Serres, Nicolas (Epinal, FR)
2010-11-09T23:59:59.000Z
A turbine assembly for a variable-geometry turbocharger includes a turbine housing defining a divided volute having first and second scrolls, wherein the first scroll has a substantially smaller volume than the second scroll. The first scroll feeds exhaust gas to a first portion of a turbine wheel upstream of the throat of the wheel, while the second scroll feeds gas to a second portion of the wheel at least part of which is downstream of the throat. Flow from the second scroll is regulated by a sliding piston. The first scroll can be optimized for low-flow conditions such that the turbocharger can operate effectively like a small fixed-geometry turbocharger when the piston is closed. The turbine housing defines an inlet that is divided by a dividing wall into two portions respectively feeding gas to the two scrolls, a leading edge of the dividing wall being downstream of the inlet mouth.
Thomas P. Sotiriou; Theocharis A. Apostolatos
2006-11-06T23:59:59.000Z
A binary system, composed of a compact object orbiting around a massive central body, will emit gravitational waves which will depend on the central body's spacetime geometry. We expect that the gravitational wave observables will somehow ``encode'' the information about the spacetime structure. On the other hand, it has been known for some time that the geometry around an axisymmetric body can be described by its (Geroch-Hansen) multipole moments. Therefore one can speculate that using the multipole moments can prove to be a helpful tool for extracting this information. We will try to demonstrate this in this talk, following the procedure described by [F. D. Ryan, Phys. Rev. D {\\bf 52} 5707 (1995)] and [T. P. Sotiriou and T. A. Apostolatos, Phys. Rev. D {\\bf 71} 044005 (2005)].
Optical reference geometry and inertial forces in Kerr-de Sitter spacetimes
Jiri Kovar; Zdenek Stuchlik
2007-01-03T23:59:59.000Z
Optical reference geometry and related concept of inertial forces are investigated in Kerr-de Sitter spacetimes. Properties of the inertial forces are summarized and their typical behaviour is illustrated. The intuitive 'Newtonian' application of the forces in the relativistic dynamics is demonstrated in the case of the test particle circular motion, static equilibrium positions and perfect fluid toroidal configurations. Features of the optical geometry are illustrated by the embedding diagrams of its equatorial plane. The embedding diagrams do not cover whole the stationary regions of the spacetimes, therefore the limits of embeddability are established. A shape of the embedding diagrams is related to the behaviour of the centrifugal force and it is characterized by the number of turning points of the diagrams. Discussion of the number of embeddable photon circular orbits is also included and the typical embedding diagrams are constructed. The Kerr-de Sitter spacetimes are classified according to the properties of the inertial forces and embedding diagrams.
Casse, G
2013-01-01T23:59:59.000Z
The aim of the CERN/RD50 collaboration is the improvement of the radiation tolerance of semiconductor detectors for future experiments at high-luminosity colliders. In the RD50 framework, evidence of enhanced signal charge in severely irradiated silicon detectors (diodes, segmented planar and 3D devices) was found. The underlying mechanism was labelled charge multiplication. This has been one of the most exciting results from the research activity of RD50 because it could allow for a greatly extended radiation tolerance, if the mechanism is to be found controllable and tuneable. The charge multiplication mechanism is governed by impact ionisation from electrons drifting in high electric field. The electric field profile is influenced by the geometry of the implanted electrodes. In order to investigate the influence of the diode implantation geometry on charge multiplication, the RD50 collaboration has commissioned the production of miniature microstrip silicon sensors with various choices of strip pitch and s...
Biondo, Elliott D [ORNL; Ibrahim, Ahmad M [ORNL; Mosher, Scott W [ORNL; Grove, Robert E [ORNL
2015-01-01T23:59:59.000Z
Detailed radiation transport calculations are necessary for many aspects of the design of fusion energy systems (FES) such as ensuring occupational safety, assessing the activation of system components for waste disposal, and maintaining cryogenic temperatures within superconducting magnets. Hybrid Monte Carlo (MC)/deterministic techniques are necessary for this analysis because FES are large, heavily shielded, and contain streaming paths that can only be resolved with MC. The tremendous complexity of FES necessitates the use of CAD geometry for design and analysis. Previous ITER analysis has required the translation of CAD geometry to MCNP5 form in order to use the AutomateD VAriaNce reducTion Generator (ADVANTG) for hybrid MC/deterministic transport. In this work, ADVANTG was modified to support CAD geometry, allowing hybrid (MC)/deterministic transport to be done automatically and eliminating the need for this translation step. This was done by adding a new ray tracing routine to ADVANTG for CAD geometries using the Direct Accelerated Geometry Monte Carlo (DAGMC) software library. This new capability is demonstrated with a prompt dose rate calculation for an ITER computational benchmark problem using both the Consistent Adjoint Driven Importance Sampling (CADIS) method an the Forward Weighted (FW)-CADIS method. The variance reduction parameters produced by ADVANTG are shown to be the same using CAD geometry and standard MCNP5 geometry. Significant speedups were observed for both neutrons (as high as a factor of 7.1) and photons (as high as a factor of 59.6).
M. Novello; F. T. Falciano; E. Goulart
2011-11-08T23:59:59.000Z
We show that Maxwell's electromagnetism can be mapped into the Born-Infeld theory in a curved space-time, which depends only on the electromagnetic field in a specific way. This map is valid for any value of the two lorentz invariants $F$ and $G$ confirming that we have included all possible solutions of Maxwell's equations. Our result seems to show that specifying the dynamics and the space-time structure of a given theory can be viewed merely as a choice of representation to describe the physical system.
Copper isotope fractionation in acid mine drainage. | EMSL
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
in acid mine drainage. Abstract: We surveyed the Cu isotopic composition of primary minerals and stream water affected by acid mine drainage in a mineralized watershed located in...
Catalytic Consequences of Acid Strength in the Conversion of...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Consequences of Acid Strength in the Conversion of Methanol to Dimethyl Ether. Catalytic Consequences of Acid Strength in the Conversion of Methanol to Dimethyl Ether. Abstract:...
AVTA: 2010 Honda Civic HEV with Experimental Ultra Lead Acid...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
0 Honda Civic HEV with Experimental Ultra Lead Acid Battery Testing Results AVTA: 2010 Honda Civic HEV with Experimental Ultra Lead Acid Battery Testing Results The Vehicle...
Effects of Continuous Triiodothyronine Infusion on Citric Acid...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Continuous Triiodothyronine Infusion on Citric Acid Cycle in the Normal Immature Swine Heart under Extracorporeal Effects of Continuous Triiodothyronine Infusion on Citric Acid...
Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview and Gap Analysis Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview and Gap Analysis This...
High Temperature Fuel Cell (Phosphoric Acid) Manufacturing R...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Temperature Fuel Cell (Phosphoric Acid) Manufacturing R&D More Documents & Publications Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview and Gap Analysis 2011...
Electrodeposition From Acidic Solutions of Nickel Bis(benzenedithiolat...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
From Acidic Solutions of Nickel Bis(benzenedithiolate) Produces a Hydrogen-Evolving Ni-S Film on Glassy Carbon Electrodeposition From Acidic Solutions of Nickel...
Entropic Dynamics: from Entropy and Information Geometry to Hamiltonians and Quantum Mechanics
Ariel Caticha; Daniel Bartolomeo; Marcel Reginatto
2014-12-17T23:59:59.000Z
Entropic Dynamics is a framework in which quantum theory is derived as an application of entropic methods of inference. There is no underlying action principle. Instead, the dynamics is driven by entropy subject to the appropriate constraints. In this paper we show how a Hamiltonian dynamics arises as a type of non-dissipative entropic dynamics. We also show that the particular form of the "quantum potential" that leads to the Schroedinger equation follows naturally from information geometry.
Markus Schmuck; Peter Berg
2012-04-30T23:59:59.000Z
We formally derive an effective catalyst layer model comprising the reduction of oxygen for periodically distributed pore geometries. By assumption, the pores are completely filled with water and the surrounding walls consist of catalyst particles which are attached to an electron conducting microstructure. The macroscopic transport equations are established by a multi-scale approach, based on microscopic phenomena at the pore level, and serve as a first step toward future optimization of catalyst layer designs.
Schmuck, Markus
2012-01-01T23:59:59.000Z
We formally derive an effective catalyst layer model comprising the reduction of oxygen for periodically distributed pore geometries. By assumption, the pores are completely filled with water and the surrounding walls consist of catalyst particles which are attached to an electron conducting microstructure. The macroscopic transport equations are established by a multi-scale approach, based on microscopic phenomena at the pore level, and serve as a first step toward future optimization of catalyst layer designs.
The effective geometry of the $n=1$ uniformly rotating self-gravitating polytrope
Donato Bini; Christian Cherubini; Simonetta Filippi; Andrea Geralico
2014-08-20T23:59:59.000Z
The \\lq\\lq effective geometry" formalism is used to study the perturbations of a perfect barotropic Newtonian self-gravitating rotating and compressible fluid coupled with gravitational backreaction. The case of a uniformly rotating polytrope with index $n=1$ is investigated, due to its analytical tractability. Special attention is devoted to the geometrical properties of the underlying background acoustic metric, focusing in particular on null geodesics as well as on the analog light cone structure.
Noncommutative spectral geometry and the deformed Hopf algebra structure of quantum field theory
Mairi Sakellariadou; Antonio Stabile; Giuseppe Vitiello
2013-01-11T23:59:59.000Z
We report the results obtained in the study of Alain Connes noncommutative spectral geometry construction focusing on its essential ingredient of the algebra doubling. We show that such a two-sheeted structure is related with the gauge structure of the theory, its dissipative character and carries in itself the seeds of quantization. From the algebraic point of view, the algebra doubling process has the same structure of the deformed Hops algebra structure which characterizes quantum field theory.
Sealable stagnation flow geometries for the uniform deposition of materials and heat
McCarty, Kevin F. (Livermore, CA); Kee, Robert J. (Livermore, CA); Lutz, Andrew E. (Alamo, CA); Meeks, Ellen (Livermore, CA)
2001-01-01T23:59:59.000Z
The present invention employs a constrained stagnation flow geometry apparatus to achieve the uniform deposition of materials or heat. The present invention maximizes uniform fluxes of reactant gases to flat surfaces while minimizing the use of reagents and finite dimension edge effects. This results, among other things, in large area continuous films that are uniform in thickness, composition and structure which is important in chemical vapor deposition processes such as would be used for the fabrication of semiconductors.
Abraham A. Ungar
2013-03-19T23:59:59.000Z
In this chapter, dedicated to the 60th Anniversary of Themistocles M. Rassias, M\\"obius transformation and Einstein velocity addition meet in the hyperbolic geometry of Bolyai and Lobachevsky. It turns out that M\\"obius addition that is extracted from M\\"obius transformation of the complex disc and Einstein addition from his special theory of relativity are isomorphic in the sense of gyrovector spaces.
Accelerated boundary integral method for multiphase flow in non-periodic geometries
Amit Kumar; Michael D. Graham
2012-06-05T23:59:59.000Z
An accelerated boundary integral method for Stokes flow of a suspension of deformable particles is presented for an arbitrary domain and implemented for the important case of a planar slit geometry. The computational complexity of the algorithm scales as O(N) or $O(N\\log N$), where $N$ is proportional to the product of number of particles and the number of elements employed to discretize the particle. This technique is enabled by the use of an alternative boundary integral formulation in which the velocity field is expressed in terms of a single layer integral alone, even in problems with non-matched viscosities. The density of the single layer integral is obtained from a Fredholm integral equation of the second kind involving the double layer integral. Acceleration in this implementation is provided by the use of General Geometry Ewald-like method (GGEM) for computing the velocity and stress fields driven by a set of point forces in the geometry of interest. For the particular case of the slit geometry, a Fourier-Chebyshev spectral discretization of GGEM is developed. Efficient implementations employing the GGEM methodology are presented for the resulting single and the double layer integrals. The implementation is validated with test problems on the velocity of rigid particles and drops between parallel walls in pressure driven flow, the Taylor deformation parameter of capsules in simple shear flow and the particle trajectory in pair collisions of capsules in shear flow. The computational complexity of the algorithm is verified with results from several large scale multiparticle simulations.
Magnetic Field Geometry of the Broad Line Radio Galaxy 3C111
P. Kharb; D. Gabuzda; W. Alef; E. Preuss; P. Shastri
2003-01-06T23:59:59.000Z
Very Long Baseline Polarimetric observations of the Broad Line Radio galaxy 3C111 performed in July and September of 1996 at 8 and 43 GHz reveal rapidly evolving parsec-scale radio structure after a large millimetre outburst. The B-field geometry is not simple. We present a first analysis of possible Faraday and optical depth effects based on a comparison of the polarization images for the two frequencies.
Jet Riemann-Lagrange Geometry Applied to Evolution DEs Systems from Economy
Neagu, Mircea
2007-01-01T23:59:59.000Z
The aim of this paper is to construct a natural Riemann-Lagrange differential geometry on 1-jet spaces, in the sense of nonlinear connections, generalized Cartan connections, d-torsions, d-curvatures, jet electromagnetic fields and jet Yang-Mills energies, starting from some given non-linear evolution DEs systems modelling economic phenomena, like the Kaldor model of the bussines cycle or the Tobin-Benhabib-Miyao model regarding the role of money on economic growth.
Anmalan av Gerald A. Edgar, Measure, Topology, and Fractal Geometry. Springer-Verlag, New
Kiselman, Christer
AnmÂ¨alan av Gerald A. Edgar, Measure, Topology, and Fractal Geometry. Springer-Verlag, New York dimensionsbegreppet. SjÂ¨alvlikformig- het tas dÂ¨arefter upp, och Edgar anvÂ¨ander grafer, s. k. MauldinÂ¨ands som exempel pÂ°a metriska rum. I stort sett mÂ°aste man sÂ¨aga att Edgar lyckats i sin ambition att g
Solutions of Two Dimensional Viscous Accretion and Winds In Kerr Black Hole Geometry
S. K. Chakrabarti
1996-11-04T23:59:59.000Z
We extend our previous studies of shock waves and shock-free solutions in thin accretion and winds in pseudo-Newtonian geometry to the case when the flow is ``two-dimensional'' and around a ``Kerr black hole''. We present equations for fully general relativistic viscous transonic flows and classify the parameter space according to whether or not shocks form in an inviscid flow. We discuss the behaviors of shear, angular momentum distribution, heating and cooling in viscous flows. We obtain a very significant result: we find that in weak viscosity limit the presence of the standing shock waves is more generic in the sense that flows away from the equatorial plane can produce shock waves in a wider range of parameter space. Similar conclusion also holds when the angular momentum of the black hole is increased. Generally, our conclusions regarding the shape of the shock waves are found to agree with results of the existing numerical simulations of the two dimensional accretion in Schwarzschild geometry. In a strong viscosity limit, the shocks may be located farther out or disappear completely as in the pseudo-Newtonian geometry.
Webs, Lenard schemes, and the local geometry of bihamiltonian Toda and Lax structures
Israel M. Gelfand; Ilya Zakharevich
2000-03-27T23:59:59.000Z
We introduce a criterion that a given bihamiltonian structure allows a local coordinate system where both brackets have constant coefficients. This criterion is applied to the bihamiltonian open Toda lattice in a generic point, which is shown to be locally isomorphic to a Kronecker odd-dimensional pair of brackets with constant coefficients. This shows that the open Toda lattice cannot be locally represented as a product of two bihamiltonian structures. In a generic point the bihamiltonian periodic Toda lattice is shown to be isomorphic to a product of two open Toda lattices (one of which is a (trivial) structure of dimension 1). While the above results might be obtained by more traditional methods, we use an approach based on general results on geometry of webs. This demonstrates a possibility to apply a geometric language to problems on bihamiltonian integrable systems, such a possibility may be no less important than the particular results proven in this paper. Based on these geometric approaches, we conjecture that decompositions similar to the decomposition of the periodic Toda lattice exist in local geometry of the Volterra system, the complete Toda lattice, the multidimensional Euler top, and a regular bihamiltonian Lie coalgebra. We also state general conjectures about geometry of more general ``homogeneous'' finite-dimensional bihamiltonian structures. The class of homogeneous structures is shown to coincide with the class of system integrable by Lenard scheme. The bihamiltonian structures which allow a non-degenerate Lax structure are shown to be locally isomorphic to the open Toda lattice.
NH Acid Rain Control Act (New Hampshire)
Broader source: Energy.gov [DOE]
The Act is implemented under New Hampshire's acid deposition control program established under the Rules to Control Air Pollution in Chapter Env-A 400. The goal of the Act is to reduce emissions...
Phosphonic acid based ion exchange resins
Horwitz, E. Philip (Naperville, IL); Alexandratos, Spiro D. (Knoxville, TN); Gatrone, Ralph C. (Naperville, IL); Chiarizia, Ronato (Oak Park, IL)
1994-01-01T23:59:59.000Z
An ion exchange resin for extracting metal ions from a liquid waste stream. An ion exchange resin is prepared by copolymerizing a vinylidene disphosphonic acid with styrene, acrylonitrile and divinylbenzene.
Phosphonic acid based ion exchange resins
Horwitz, E.P.; Alexandratos, S.D.; Gatrone, R.C.; Chiarizia, R.
1996-07-23T23:59:59.000Z
An ion exchange resin is described for extracting metal ions from a liquid waste stream. An ion exchange resin is prepared by copolymerizing a vinylidene diphosphonic acid with styrene, acrylonitrile and divinylbenzene. 10 figs.
Phosphonic acid based ion exchange resins
Horwitz, E. Philip (Naperville, IL); Alexandratos, Spiro D. (Knoxville, TN); Gatrone, Ralph C. (Naperville, IL); Chiarizia, Ronato (Oak Park, IL)
1996-01-01T23:59:59.000Z
An ion exchange resin for extracting metal ions from a liquid waste stream. An ion exchange resin is prepared by copolymerizing a vinylidene diphosphonic acid with styrene, acrylonitrile and divinylbenzene.
Phosphonic acid based ion exchange resins
Horwitz, E.P.; Alexandratos, S.D.; Gatrone, R.C.; Chiarizia, R.
1994-01-25T23:59:59.000Z
An ion exchange resin is described for extracting metal ions from a liquid waste stream. An ion exchange resin is prepared by copolymerizing a vinylidene diphosphonic acid with styrene, acrylonitrile and divinylbenzene. 9 figures.
2010-01-01T23:59:59.000Z
R.G.B and J.A.E. ). Keywords: biomass · carboxylic acids ·10.1002/cssc.201000111 A Direct, Biomass-Based Synthesis ofaro- matic compounds from biomass resources could provide a
Long range transport of acid rain precursors
Fay, James A.
1983-01-01T23:59:59.000Z
A model of the long range transport of primary and secondary pollutants derived by Fay and Rosenzweig (1) is applied to the problem of the transport of acid rain precursors. The model describes the long term average (annual ...
Methods for analyzing nucleic acid sequences
Korlach, Jonas (Ithaca, NY); Webb, Watt W. (Ithaca, NY); Levene, Michael (Ithaca, NY); Turner, Stephen (Ithaca, NY); Craighead, Harold G. (Ithaca, NY); Foquet, Mathieu (Ithaca, NY)
2011-05-17T23:59:59.000Z
The present invention is directed to a method of sequencing a target nucleic acid. The method provides a complex comprising a polymerase enzyme, a target nucleic acid molecule, and a primer, wherein the complex is immobilized on a support Fluorescent label is attached to a terminal phosphate group of the nucleotide or nucleotide analog. The growing nucleic acid strand is extended by using the polymerase to add a nucleotide analog to the nucleic acid strand. The nucleotide analog added to the oligonucleotide primer as a result of the polymerizing step is identified. The time duration of the signal from labeled nucleotides or nucleotide analogs that become incorporated is distinguished from freely diffusing labels by a longer retention in the observation volume for the nucleotides or nucleotide analogs that become incorporated than for the freely diffusing labels.
Replica amplification of nucleic acid arrays
Church, George M. (Brookline, MA); Mitra, Robi D. (Chestnut Hill, MA)
2010-08-31T23:59:59.000Z
Disclosed are improved methods of making and using immobilized arrays of nucleic acids, particularly methods for producing replicas of such arrays. Included are methods for producing high density arrays of nucleic acids and replicas of such arrays, as well as methods for preserving the resolution of arrays through rounds of replication. Also included are methods which take advantage of the availability of replicas of arrays for increased sensitivity in detection of sequences on arrays. Improved methods of sequencing nucleic acids immobilized on arrays utilizing single copies of arrays and methods taking further advantage of the availability of replicas of arrays are disclosed. The improvements lead to higher fidelity and longer read lengths of sequences immobilized on arrays. Methods are also disclosed which improve the efficiency of multiplex PCR using arrays of immobilized nucleic acids.
Geometry dependence of RMT-based methods to extract the low-energy constants Sigma and F
Christoph Lehner; Jacques Bloch; Shoji Hashimoto; Tilo Wettig
2011-06-21T23:59:59.000Z
The lowest-order low-energy constants $\\Sigma$ and $F$ of chiral pertubation theory can be extracted from lattice data using methods based on the equivalence of random matrix theory (RMT) and QCD in the epsilon regime. We discuss how the choice of the lattice geometry affects such methods. In particular, we show how to minimize systematic deviations from RMT by an optimal choice of the lattice geometry in the case of two light quark flavors. We illustrate our findings by determining $\\Sigma$ and $F$ from lattice configurations with two dynamical overlap fermions generated by JLQCD, using two different lattice geometries.
NO reduction using sublimation of cyanuric acid
Perry, R.A.
1996-05-21T23:59:59.000Z
A method of reducing the NO content of a gas stream comprises contacting the gas stream with an amount of HNCO at a temperature effective for heat-induced decomposition of cyanuric acid, said amount and temperature being effective for the resultant lowering of the NO content of the gas stream, said cyanuric acid being particulate and having a particle size of less than 90 {micro}m. 1 fig.
Amplification of trace amounts of nucleic acids
Church, George M. (Brookline, MA); Zhang, Kun (Brighton, MA)
2008-06-17T23:59:59.000Z
Methods of reducing background during amplification of small amounts of nucleic acids employ careful analysis of sources of low level contamination. Ultraviolet light can be used to reduce nucleic acid contaminants in reagents and equipment. "Primer-dimer" background can be reduced by judicious design of primers. We have shown clean signal-to-noise with as little as starting material as one single human cell (.about.6 picogram), E. coli cell (.about.5 femtogram) or Prochlorococcus cell (.about.3 femtogram).
3D characterization of acidized fracture surfaces
Malagon Nieto, Camilo
2007-09-17T23:59:59.000Z
3D CHARACTERIZATION OF ACIDIZED FRACTURE SURFACES A Thesis by CAMILO MALAGON NIETO Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... May 2007 Major Subject: Petroleum Engineering ii 3D CHARACTERIZATION OF ACIDIZED FRACTURE SURFACES A Thesis by CAMILO MALAGON NIETO Submitted to the Office of Graduate Studies of Texas A&M University in partial...
Organic Phosphoric Acid of the Soil.
Fraps, G. S. (George Stronach)
1911-01-01T23:59:59.000Z
cc ammonia. The phosphates of lime are: little soluble. The phosphates of iron and of aluminium are more easily decomposed, especially w avellite an3 .vivianite. TABLE 1. SOLUBILITY OF PHOSPHORIC ACID OF MINERAL PHOSPHAl AMMONIA. Laboratory...'ammonia of one-tenth per cent exerts a decided solvent ac- tion upon these minerals. Ahmonia dissolves phosphoric acid from the phosphates of iron and aluminium chiefly. None of the phosphates ordinarily found in the soil are completely decomposed by ammonia...
Dicus, Christina Marie
2009-05-15T23:59:59.000Z
The purpose of this study was first to develop a method by which a detailed porosity classification system could be utilized to understand the relationship between pore/pore-throat geometry, genetic porosity type, and ...
Dicus, Christina Marie
2008-10-10T23:59:59.000Z
The purpose of this study was first to develop a method by which a detailed porosity classification system could be utilized to understand the relationship between pore/pore-throat geometry, genetic porosity type, and ...
Lioubimov, Vladimir
2010-01-14T23:59:59.000Z
fluorescence, the exact relativistic formula for the transition frequency v0 = pvcoll ? vanticoll can be applied. In this geometry ion source instabilities due to pressure and anode voltage fluctuation are minimized. The procedure of fluorescence lineshapes...
Blackman, Ingrid Maria
2004-09-30T23:59:59.000Z
be difficult to distinguish reservoir from non-reservoir intervals in successions of thinly interbedded sandstones and shales using conventional well logs; (3) There is limited outcrop analogue data that could be used to estimate the geometry and lateral... the depositional geometry and continuity of deep-water reservoir sandstones within the Basal Unit of the Scotland Formation in Woodbourne Trough, beneath Barbados. Observations in the study area were combined with observations of local outcrops of the Scotland...
Transcription factor-based biosensors for detecting dicarboxylic acids
Dietrich, Jeffrey; Keasling, Jay
2014-02-18T23:59:59.000Z
The invention provides methods and compositions for detecting dicarboxylic acids using a transcription factor biosensor.
Energy densification of biomass-derived organic acids
Wheeler, M. Clayton; van Walsum, G. Peter; Schwartz, Thomas J.; van Heiningen, Adriaan
2013-01-29T23:59:59.000Z
A process for upgrading an organic acid includes neutralizing the organic acid to form a salt and thermally decomposing the resulting salt to form an energy densified product. In certain embodiments, the organic acid is levulinic acid. The process may further include upgrading the energy densified product by conversion to alcohol and subsequent dehydration.
Purification Or Organic Acids Using Anion Exchange Chromatography.
Ponnampalam; Elankovan (Okemos, MI)
2001-09-04T23:59:59.000Z
Disclosed is a cost-effective method for purifying and acidifying carboxylic acids, including organic acids and amino acids. The method involves removing impurities by allowing the anionic form of the carboxylic acid to bind to an anion exchange column and washing the column. The carboxylic anion is displaced as carboxylic acid by washing the resin with a strong inorganic anion. This method is effective in removing organic carboxylic acids and amino acids from a variety of industrial sources, including fermentation broths, hydrolysates, and waste streams.
Pakistan Vet. J., 24(3): 2004 EFFECTS OF ASCORBIC ACID AND ACETYLSALICYLIC ACID
Paris-Sud XI, Université de
Pakistan Vet. J., 24(3): 2004 109 EFFECTS OF ASCORBIC ACID AND ACETYLSALICYLIC ACID SUPPLEMENTATION Sciences, Lahore-54000, Pakistan ABSTRACT A total of 100, day-old broiler chicks were randomly divided production in the tropics. In Pakistan, temperature remains well beyond the higher side of thermoneutral zone
System for agitating the acid in a lead-acid battery
Weintraub, Alvin (Schenectady, NY); MacCormack, Robert S. (Glenville, NY)
1987-01-01T23:59:59.000Z
A system and method for agitating the acid in a large lead-sulfuric acid storage battery of the calcium type. An air-lift is utilized to provide the agitation. The air fed to the air-lift is humidified prior to being delivered to the air-lift.
Asthmatic responses to airborne acid aerosols
Ostro, B.D.; Lipsett, M.J.; Wiener, M.B.; Selner, J.C. (California Department of Health Services, Berkeley (USA))
1991-06-01T23:59:59.000Z
Controlled exposure studies suggest that asthmatics may be more sensitive to the respiratory effects of acidic aerosols than individuals without asthma. This study investigates whether acidic aerosols and other air pollutants are associated with respiratory symptoms in free-living asthmatics. Daily concentrations of hydrogen ion (H+), nitric acid, fine particulates, sulfates and nitrates were obtained during an intensive air monitoring effort in Denver, Colorado, in the winter of 1987-88. A panel of 207 asthmatics recorded respiratory symptoms, frequency of medication use, and related information in daily diaries. We used a multiple regression time-series model to analyze which air pollutants, if any, were associated with health outcomes reported by study participants. Airborne H+ was found to be significantly associated with several indicators of asthma status, including moderate or severe cough and shortness of breath. Cough was also associated with fine particulates, and shortness of breath with sulfates. Incorporating the participants' time spent outside and exercise intensity into the daily measure of exposure strengthened the association between these pollutants and asthmatic symptoms. Nitric acid and nitrates were not significantly associated with any respiratory symptom analyzed. In this population of asthmatics, several outdoor air pollutants, particularly airborne acidity, were associated with daily respiratory symptoms.
Sulfuric acid-sulfur heat storage cycle
Norman, John H. (LaJolla, CA)
1983-12-20T23:59:59.000Z
A method of storing heat is provided utilizing a chemical cycle which interconverts sulfuric acid and sulfur. The method can be used to levelize the energy obtained from intermittent heat sources, such as solar collectors. Dilute sulfuric acid is concentrated by evaporation of water, and the concentrated sulfuric acid is boiled and decomposed using intense heat from the heat source, forming sulfur dioxide and oxygen. The sulfur dioxide is reacted with water in a disproportionation reaction yielding dilute sulfuric acid, which is recycled, and elemental sulfur. The sulfur has substantial potential chemical energy and represents the storage of a significant portion of the energy obtained from the heat source. The sulfur is burned whenever required to release the stored energy. A particularly advantageous use of the heat storage method is in conjunction with a solar-powered facility which uses the Bunsen reaction in a water-splitting process. The energy storage method is used to levelize the availability of solar energy while some of the sulfur dioxide produced in the heat storage reactions is converted to sulfuric acid in the Bunsen reaction.
Omiecinski, Curtis
of genes encoding fatty acid synthase, stearoyl-CoA desaturase, the S14 protein, and L-type pyruvate kinasePolyunsaturated Fatty Acid Suppression of Hepatic Fatty Acid Synthase and S14 Gene Expression Does, Maryland 20892 Dietary polyunsaturated fatty acids (PUFA) induce hepatic peroxisomal and microsomal fatty
Improvement of extraction system geometry with suppression of possible Penning discharge ignition
Delferrière, O., E-mail: olivier.delferriere@cea.fr; Gobin, R.; Harrault, F.; Nyckees, S.; Tuske, O. [Commissariat à l’Energie Atomique et aux Energies Alternatives, CEA/Saclay, DSM/IRFU, 91191-Gif/Yvette (France)] [Commissariat à l’Energie Atomique et aux Energies Alternatives, CEA/Saclay, DSM/IRFU, 91191-Gif/Yvette (France)
2014-02-15T23:59:59.000Z
During the past two years, a new ECR 2.45 GHz type ion source has been developed especially dedicated to intense light ion injector project like IPHI (Injecteur Proton Haute Intensité), IFMIF (International Fusion Materials Irradiation Facility), to reduce beam emittance at RFQ entrance by shortening the length of the LEBT. This new ALISES concept (Advanced Light Ion Source Extraction System) is based on the use of an additional LEBT short length solenoid very close to the extraction aperture. The fringe field of this new solenoid produces the needed magnetic field to create the ECR resonance in the plasma chamber. Such geometry allows first putting the solenoid at ground potential, while saving space in front of the extraction to move the first LEBT solenoid closer and focus earlier the intense extracted beam. During the commissioning of the source in 2011–2012, ALISES has produced about 20 mA extracted from a 6 mm diameter plasma extraction hole at 23 kV. But the magnetic configuration combined to the new extraction system geometry led to important Penning discharge conditions in the accelerator column. Lots of them have been eliminated by inserting glass pieces between electrodes to modify equipotential lines with unfavorable ExB vacuum zones where particles were produced and trapped. To study Penning discharge location, several 3D calculations have been performed with OPERA-3D/TOSCA code to simulate the possible production and trapping of electrons in the extraction system. The results obtained on different sources already built have shown very good agreement with sparks location observed experimentally on electrodes. The simulations results as well as experimental measurements are presented and solutions to prevent possible Penning discharge in future source geometries are established.
Mesoscopic model for filament orientation in growing actin networks: the role of obstacle geometry
Julian Weichsel; Ulrich S. Schwarz
2013-04-13T23:59:59.000Z
Propulsion by growing actin networks is a universal mechanism used in many different biological systems. Although the core molecular machinery for actin network growth is well preserved in most cases, the geometry of the propelled obstacle can vary considerably. In recent years, filament orientation distribution has emerged as an important observable characterizing the structure and dynamical state of the growing network. Here we derive several continuum equations for the orientation distribution of filaments growing behind stiff obstacles of various shapes and validate the predicted steady state orientation patterns by stochastic computer simulations based on discrete filaments. We use an ordinary differential equation approach to demonstrate that for flat obstacles of finite size, two fundamentally different orientation patterns peaked at either +35/-35 or +70/0/-70 degrees exhibit mutually exclusive stability, in agreement with earlier results for flat obstacles of very large lateral extension. We calculate and validate phase diagrams as a function of model parameters and show how this approach can be extended to obstacles with piecewise straight contours. For curved obstacles, we arrive at a partial differential equation in the continuum limit, which again is in good agreement with the computer simulations. In all cases, we can identify the same two fundamentally different orientation patterns, but only within an appropriate reference frame, which is adjusted to the local orientation of the obstacle contour. Our results suggest that two fundamentally different network architectures compete with each other in growing actin networks, irrespective of obstacle geometry, and clarify how simulated and electron tomography data have to be analyzed for non-flat obstacle geometries.
T. Wiegelmann; T. Neukirch; P. Ruan; B. Inhester
2008-01-18T23:59:59.000Z
Context: This paper presents a method which can be used to calculate models of the global solar corona from observational data. Aims: We present an optimization method for computing nonlinear magnetohydrostatic equilibria in spherical geometry with the aim to obtain self-consistent solutions for the coronal magnetic field, the coronal plasma density and plasma pressure using observational data as input. Methods: Our code for the self-consistent computation of the coronal magnetic fields and the coronal plasma solves the non-force-free magnetohydrostatic equilibria using an optimization method. Previous versions of the code have been used to compute non-linear force-free coronal magnetic fields from photospheric measurements in Cartesian and spherical geometry, and magnetostatic-equilibria in Cartesian geometry. We test our code with the help of a known analytic 3D equilibrium solution of the magnetohydrostatic equations. The detailed comparison between the numerical calculations and the exact equilibrium solutions is made by using magnetic field line plots, plots of density and pressure and some of the usual quantitative numerical comparison measures. Results: We find that the method reconstructs the equilibrium accurately, with residual forces of the order of the discretisation error of the analytic solution. The correlation with the reference solution is better than 99.9% and the magnetic energy is computed accurately with an error of <0.1%. Conclusions: We applied the method so far to an analytic test case. We are planning to use this method with real observational data as input as soon as possible.
Timing of structural growth at Northwest Stevens field as evidenced by Stevens channel geometries
Berkman, T.A. (ARCO Oil and Gas Co., Bakersfield, CA (United States))
1991-02-01T23:59:59.000Z
Stacked upper Miocene Stevens sandstone bodies at Northwest Stevens (Tule Elk) are the product of two coalescing turbidite channels which reflect the influence of growing structure during deposition. One channel can be traced from the south through ARCO's 555 zone unit, the 26R and 2B pools at Elk Hills, and into Northwest Stevens. The 800-ft-thick T' turbidite sands from this channel form offlapping geometries and structural/stratigraphic traps due to deposition across the rising northwest-plunging nose of the Northwest Stevens anticline. They are medium- to coarse-grained with abundant mudstone interbeds and are interpreted to represent a depositional channel fill which grades laterally to less permeable finer grained overbank deposits along the east side of Northwest Stevens. The second coeval channel can be traced from McKittrick through Asphalto and the 24Z pool at Elk Hills into Northwest Stevens, where it forms a 1,700-ft-thick sequence of 80 to 500-ft-thick sand packages at the 7R pool. Sand-shale ratios in these pebbly sandstones are nearly 9 to 1 with abundant conglomeratic interbeds. These channel sands display blocky electric log signatures, have lenticular geometries at the top of the sequence and offlapping geometries at the base, and document deposition in a structural low adjacent to the rising Northwest Stevens structure. The upper Miocene correlation point (UMPC) is sanded out at the 7R pool, indicating that turbidite sand deposition there persisted into lower Reef Ridge time. Well correlations indicate only minor erosive deposition and amalgamation; thus, the sand bodies at Northwest Stevens are additive to the section.
Kim, Sehun
-12 Specially, research into the adsorption of amino acids, which include carboxyl, amino, sulfur, or a variety the up and down atoms of the dimers show zwitterionic character and function as a Lewis base and acid of 10 natural amino acids on Ge(100)-2×1 surfaces.19-26 We have identified the general trend among
Influence of finite radial geometry on the growth rate of ion-channel free electron laser
Bahmani, Mohammad; Hamzehpour, Hossein [Department of Physics, K.N. Toosi University of Technology, Tehran 15875-4416 (Iran, Islamic Republic of)] [Department of Physics, K.N. Toosi University of Technology, Tehran 15875-4416 (Iran, Islamic Republic of); Hasanbeigi, Ali [Department of Physics and Institute for Plasma Research, Kharazmi University, 49 Dr. Mofateh Avenue, Tehran 15614 (Iran, Islamic Republic of)] [Department of Physics and Institute for Plasma Research, Kharazmi University, 49 Dr. Mofateh Avenue, Tehran 15614 (Iran, Islamic Republic of)
2013-11-15T23:59:59.000Z
The influence of finite radial geometry on the instability of a tenuous relativistic electron beam propagating in an ion-channel in a waveguide is investigated. The instability analysis is based on the linearized Vlasov-Maxwell equations for the perturbation about a self-consistent beam equilibrium. With the help of characteristic method the dispersion relation for the TE-mode is derived and analyzed through the numerical solutions. It is found that the positioning of the beam radius R{sub b} relative to the waveguide radius R{sub c}, and the ion-channel frequency can have a large influence on the maximum growth rate and corresponding wave number.
Global Solutions of Viscous Transonic Flows in Kerr Geometry I: Weak Viscosity Limit
Sandip K. Chakrabarti
1996-11-04T23:59:59.000Z
We present fully general relativistic equations governing viscous transonic flows in vertical equilibrium in Kerr geometry. We find the complete set of global solutions (both for Optically thick and optically thin flows) in the weak viscosity limit. We show that for a large region of parameter space, centrifugal pressure supported standing shocks can form in accretion and winds very close to the black hole horizon, both for co-rotating and contra-rotating flows. We compute the nature of the shear tensor for complete transonic solutions and discuss the consequences of its reversal properties.
New method for computing ideal MHD normal modes in axisymmetric toroidal geometry
Wysocki, F.; Grimm, R.C.
1984-11-01T23:59:59.000Z
Analytic elimination of the two magnetic surface components of the displacement vector permits the normal mode ideal MHD equations to be reduced to a scalar form. A Galerkin procedure, similar to that used in the PEST codes, is implemented to determine the normal modes computationally. The method retains the efficient stability capabilities of the PEST 2 energy principle code, while allowing computation of the normal mode frequencies and eigenfunctions, if desired. The procedure is illustrated by comparison with earlier various of PEST and by application to tilting modes in spheromaks, and to stable discrete Alfven waves in tokamak geometry.
Noncommutative Geometry and a Discretized Version of Kaluza-Klein Theory with a Finite Field Content
Nguyen Ai Viet; Kameshwar C. Wali
1994-12-27T23:59:59.000Z
We consider a four-dimensional space-time supplemented by two discrete points assigned to a $Z_2$ algebraic structure and develop the formalism of noncommutative geometry. By setting up a generalised vielbein, we study the metric structure. Metric compatible torsion free connection defines a unique finite field content in the model and leads to a discretized version of Kaluza-Klein theory. We study some special cases of this model that illustrate the rich and complex structure with massive modes and the possible presence of a cosmological constant.
Fast ion charge exchange spectroscopy adapted for tangential viewing geometry in LHD
Ito, T.; Osakabe, M.; Ida, K.; Yoshinuma, M.; Kobayashi, M.; Goto, M.; Isobe, M.; Toi, K.; Takeiri, Y.; Okamura, S. [National Institute for Fusion Science, Toki 509-5292 (Japan); Murakami, S.; Kobayashi, S. [Department of Nuclear Engineering, Kyoto University, Kyoto 606-8501 (Japan); Ogawa, K. [Department of Energy Engineering and Science, Nagoya University, Nagoya 464-8601 (Japan)
2010-10-15T23:59:59.000Z
A tangential Fast Ion Charge eXchange Spectroscopy is newly applied on a Large Helical Device (LHD) for co/countercirculating fast ions, which are produced by high energy tangential negative-ion based neutral beam injection. With this new observation geometry, both the tangential-neutral beam (NB) and a low-energy radial-NB based on positive ions can be utilized as probe beams of the measurement. We have successfully observed Doppler-shifted H-alpha lights due to the charge exchange process between the probing NB and circulating hydrogen ions of around 100 keV in LHD plasmas.
Effects of geometry and impurities on quantum rings in magnetic fields RID D-3014-2009
Aichinger, M.; Chin, Siu A.; Krotscheck, E.; Rasanen, E.
2006-01-01T23:59:59.000Z
Effects of geometry and impurities on quantum rings in magnetic fields M. Aichinger,1,2 S. A. Chin,3,* E. Krotscheck,1,? and E. R?s?nen1,4,? 1Institut f?r Theoretische Physik, Johannes Kepler Universit?t, A-4040 Linz, Austria 2Department... for Medical-Informatics, Upper Austrian Research, Hauptstrasse 99, A-4232 Hagenberg, Austria 3Department of Physics, Texas A&M University College Station, Texas 77843-4242, USA 4Institut f?r Theoretische Physik, Freie Universit?t Berlin, Arnimallee 14, D...
Force-free magnetosphere on near-horizon geometry of near-extreme Kerr black holes
Huiquan Li; Cong Yu; Jiancheng Wang; Zhaoyi Xu
2015-04-03T23:59:59.000Z
We study force-free magnetospheres in the Blandford-Znajek process from rapidly rotating black holes by adopting the near-horizon geometry of near-extreme Kerr black holes (near-NHEK). It is shown that the Znajek regularity condition on the horizon can be directly derived from the resulting stream equation. In terms of the condition, we split the full stream equation into two separate equations. Approximate solutions around the rotation axis are derived. They are found to be consistent with previous solutions obtained in the asymptotic region. The solutions indicate energy and angular-momentum extraction from the hole.
Fritz, Gregory M; Knepper, Robert Allen; Weihs, Timothy P; Gash, Alexander E; Sze, John S
2013-04-30T23:59:59.000Z
An energetic composite having a plurality of reactive particles each having a reactive multilayer construction formed by successively depositing reactive layers on a rod-shaped substrate having a longitudinal axis, dividing the reactive-layer-deposited rod-shaped substrate into a plurality of substantially uniform longitudinal segments, and removing the rod-shaped substrate from the longitudinal segments, so that the reactive particles have a controlled, substantially uniform, cylindrically curved or otherwise rod-contoured geometry which facilitates handling and improves its packing fraction, while the reactant multilayer construction controls the stability, reactivity and energy density of the energetic composite.
Extension of Information Geometry to Non-statistical Systems: Some Examples
Jan Naudts; Ben Anthonis
2015-06-12T23:59:59.000Z
Our goal is to extend information geometry to situations where statistical modeling is not obvious. The setting is that of modeling experimental data. Quite often the data are not of a statistical nature. Sometimes also the model is not a statistical manifold. An example of the former is the description of the Bose gas in the grand canonical ensemble. An example of the latter is the modeling of quantum systems with density matrices. Conditional expectations in the quantum context are reviewed. The border problem is discussed: through conditioning the model point shifts to the border of the differentiable manifold.
Water and UV degradable lactic acid polymers
Bonsignore, P.V.; Coleman, R.D.
1996-10-08T23:59:59.000Z
A water and UV light degradable copolymer is described made from monomers of lactic acid and a modifying monomer selected from the class consisting of ethylene glycol, propylene glycol, P-dioxanone, 1,5 dioxepan-2-one, 1,4-oxathialan-2-one, 1,4-dioxide and mixtures thereof. These copolymers are useful for waste disposal and agricultural purposes. Also disclosed is a water degradable blend of polylactic acid or modified polylactic acid and high molecular weight polyethylene oxide wherein the high molecular weight polyethylene oxide is present in the range of from about 2 by weight to about 50% by weight, suitable for films. A method of applying an active material selected from the class of seeds, seedlings, pesticides, herbicides, fertilizers and mixtures thereof to an agricultural site is also disclosed.
Water and UV degradable lactic acid polymers
Bonsignore, Patrick V. (Joliet, IL); Coleman, Robert D. (Wheaton, IL)
1996-01-01T23:59:59.000Z
A water and UV light degradable copolymer of monomers of lactic acid and a modifying monomer selected from the class consisting of ethylene glycol, propylene glycol, P-dioxanone, 1,5 dioxepan-2-one, 1,4-oxathialan-2-one, 1,4-dioxide and mixtures thereof. These copolymers are useful for waste disposal and agricultural purposes. Also disclosed is a water degradable blend of polylactic acid or modified polylactic acid and high molecular weight polyethylene oxide wherein the high molecular weight polyethylene oxide is present in the range of from about 2 by weight to about 50% by weight, suitable for films. A method of applying an active material selected from the class of seeds, seedlings, pesticides, herbicides, fertilizers and mixtures thereof to an agricultural site is also disclosed.