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.
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
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...
Jin, Xiao
2013-11-21T23:59:59.000Z
being formed. Also, when the core length reaches a certain value, the optimum acid injection rate is independent of the core radius given that the core radius is large enough to comprise the early effects of wormhole competition. One inch diameter...
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
Reha-Krantz, Linda J.; Hariharan, Chithra; Subuddhi, Usharani; Xia, Shuangluo; Zhao, Chao; Beckman, Jeff; Christian, Thomas; Konigsberg, William (Yale); (Alberta)
2011-11-21T23:59:59.000Z
The adenine base analogue 2-aminopurine (2AP) is a potent base substitution mutagen in prokaryotes because of its enhanceed ability to form a mutagenic base pair with an incoming dCTP. Despite more than 50 years of research, the structure of the 2AP-C base pair remains unclear. We report the structure of the 2AP-dCTP base pair formed within the polymerase active site of the RB69 Y567A-DNA polymerase. A modified wobble 2AP-C base pair was detected with one H-bond between N1 of 2AP and a proton from the C4 amino group of cytosine and an apparent bifurcated H-bond between a proton on the 2-amino group of 2-aminopurine and the ring N3 and O2 atoms of cytosine. Interestingly, a primer-terminal region rich in AT base pairs, compared to GC base pairs, facilitated dCTP binding opposite template 2AP. We propose that the increased flexibility of the nucleotide binding pocket formed in the Y567A-DNA polymerase and increased 'breathing' at the primer-terminal junction of A+T-rich DNA facilitate dCTP binding opposite template 2AP. Thus, interactions between DNA polymerase residues with a dynamic primer-terminal junction play a role in determining base selectivity within the polymerase active site of RB69 DNA polymerase.
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
Advanced Review Geometry optimization
Schlegel, H. Bernhard
Advanced Review Geometry optimization H. Bernhard Schlegel Geometry optimization is an important part of most quantum chemical calcu- lations. This article surveys methods for optimizing equilibrium geometries, lo- cating transition structures, and following reaction paths. The emphasis is on optimizations
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.
harmonic analysis and geometry
Faculty listing for "harmonic analysis and geometry". vCard of Nicola Garofalo Garofalo, Nicola [bio] [homepage] Adjunct Professor of Mathematics
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.
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
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
Forschungsschwerpunkt S92 Industrial Geometry
JÃ¼ttler, Bert
Forschungsschwerpunkt S92 Industrial Geometry http://www.ig.jku.at Computational Geometry Robot Kinematics Computer Aided Geometric Design Image Processing INDUSTRIAL GEOMETRY Classical Geometry Computer unwanted branches of the implicitly defined curves. Moreover, it is required for many applications, e
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.
Cederwall, Martin
2015-01-01T23:59:59.000Z
We investigate exceptional generalised diffeomorphisms based on $E_{8(8)}$ in a geometric setting. The transformations include gauge transformations for the dual gravity field. The surprising key result, which allows for a development of a tensor formalism, is that it is possible to define field-dependent transformations containing connection, which are covariant. We solve for the spin connection and construct a curvature tensor. A geometry for the Ehlers symmetry SL(n+1) is sketched. Some related issues are discussed.
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.
JOURNAL FOR GEOMETRY AND GRAPHICS
Stachel, Hellmuth
JOURNAL FOR GEOMETRY AND GRAPHICS . . . the journal for graphics educators AIMS AND SCOPE methodology in the field of graphics and graphics-related geometry by the dissemination of new results. JGG is the journal of the International Society for Geometry and Graphics FREQUENCY One volume per year, consisting
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 ...
A prediction for bubbling geometries
Takuya Okuda
2008-02-11T23:59:59.000Z
We study the supersymmetric circular Wilson loops in N=4 Yang-Mills theory. Their vacuum expectation values are computed in the parameter region that admits smooth bubbling geometry duals. The results are a prediction for the supergravity action evaluated on the bubbling geometries for Wilson loops.
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.
Tensor network states and geometry
G. Evenbly; G. Vidal
2011-06-06T23:59:59.000Z
Tensor network states are used to approximate ground states of local Hamiltonians on a lattice in D spatial dimensions. Different types of tensor network states can be seen to generate different geometries. Matrix product states (MPS) in D=1 dimensions, as well as projected entangled pair states (PEPS) in D>1 dimensions, reproduce the D-dimensional physical geometry of the lattice model; in contrast, the multi-scale entanglement renormalization ansatz (MERA) generates a (D+1)-dimensional holographic geometry. Here we focus on homogeneous tensor networks, where all the tensors in the network are copies of the same tensor, and argue that certain structural properties of the resulting many-body states are preconditioned by the geometry of the tensor network and are therefore largely independent of the choice of variational parameters. Indeed, the asymptotic decay of correlations in homogeneous MPS and MERA for D=1 systems is seen to be determined by the structure of geodesics in the physical and holographic geometries, respectively; whereas the asymptotic scaling of entanglement entropy is seen to always obey a simple boundary law -- that is, again in the relevant geometry. This geometrical interpretation offers a simple and unifying framework to understand the structural properties of, and helps clarify the relation between, different tensor network states. In addition, it has recently motivated the branching MERA, a generalization of the MERA capable of reproducing violations of the entropic boundary law in D>1 dimensions.
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.
Geometry, topology, and string theory
Varadarajan, Uday
2003-07-10T23:59:59.000Z
A variety of scenarios are considered which shed light upon the uses and limitations of classical geometric and topological notions in string theory. The primary focus is on situations in which D-brane or string probes of a given classical space-time see the geometry quite differently than one might naively expect. In particular, situations in which extra dimensions, non-commutative geometries as well as other non-local structures emerge are explored in detail. Further, a preliminary exploration of such issues in Lorentzian space-times with non-trivial causal structures within string theory is initiated.
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
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
NFN -Nationales Forschungsnetzwerk Geometry + Simulation
JÃ¼ttler, Bert
in the paper is part of a process pipeline for solving the isogeometric segmentation problem that we outline of the geometry description with the prevailing standard in Computer Aided Design [1, 2]. Additional advantages by means of discrete harmonic functions is constructed. This initial parametrization is then used
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.
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.
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.
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.
Quantum Geometry and Black Holes
G., J Fernando Barbero
2015-01-01T23:59:59.000Z
We present an overall picture of the advances in the description of black hole physics from the perspective of loop quantum gravity. After an introduction that discusses the main conceptual issues we present some details about the classical and quantum geometry of isolated horizons and their quantum geometry and then use this scheme to give a natural definition of the entropy of black holes. The entropy computations can be neatly expressed in the form of combinatorial problems solvable with the help of methods based on number theory and the use of generating functions. The recovery of the Bekenstein-Hawking law and corrections to it is explained in some detail. After this, due attention is paid to the discussion of semiclassical issues. An important point in this respect is the proper interpretation of the horizon area as the energy that should appear in the statistical-mechanical treatment of the black hole model presented here. The chapter ends with a comparison between the microscopic and semiclassical app...
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.
Computational Algebraic Geometry and Switching Surfaces in ...
... and Y. Yomdin, \\Robotic manipulators and the geometry of real semi-. algebraic sets," IEEE Journal of Robotics and Automation RA-3 (1987), 301-308. 12.
Equivalence of Convex Problem Geometry and Computational ...
2009-01-19T23:59:59.000Z
Equivalence of Convex Problem Geometry and Computational Complexity in the Separation Oracle Model?. Robert M. Freund†and Jorge Vera‡. January 2009.
Changing the Structure Boundary Geometry
Karasev, Viktor; Dzlieva, Elena; Ivanov, Artyom [St.-Petersburg State University, Physics Faculty, Ulianovskaya 1, Peterhof, St. Petersburg, 198504 (Russian Federation)
2008-09-07T23:59:59.000Z
Analysis of previously obtained results shows that hexagonal crystal lattice is the dominant type of ordering, in particular, in striated glow discharges. We explore the possibility for changing the dust distribution in horizontal cross sections of relatively highly ordered structures in a glow-discharge. Presuming that boundary geometry can affect dust distribution, we used cylindrical coolers held at 0 deg. C and placed against a striation containing a structure, to change the geometry of its outer boundary. By varying the number of coolers, their positions, and their separations from the tube wall, azimuthally asymmetric thermophoretic forces can be used to form polygonal boundaries and vary the angles between their segments (in a horizontal cross section). The corner in the structure's boundary of 60 deg. stimulates formation of hexagonal cells. The structure between the supported parallel boundaries is also characterized by stable hexagonal ordering. We found that a single linear boundary segment does not give rise to any sizable domain, but generates a lattice extending from the boundary (without edge defects). A square lattice can be formed by setting the angle equal to 90 deg. . However, angles of 45 deg. and 135 deg. turned out easier to form. Square lattice was created by forming a near-135 deg. corner with four coolers. It was noted that no grain ordering is observed in the region adjacent to corners of angles smaller than 30 deg. , which do not promote ordering into cells of any shape. Thus, manipulation of a structure boundary can be used to change dust distribution, create structures free of the ubiquitous edge defects that destroy orientation order, and probably change the crystal lattice type.
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
NATURAL CONVECTION IN ROOM GEOMETRIES
Gadgil, A.; Bauman, Fred; Kammerud, R.; Ruberg, K.
1980-06-01T23:59:59.000Z
Computer programs have been developed to numerically simulate natural convection in room geometries in two and three dimensions. The programs have been validated using published data from the literature, results from a full-scale experiment performed at Massachusetts Institute of Technology, and results from a small-scale experiment reported here. One of the computer programs has been used to study the influence of natural convection on the thermal performance of a single thermal zone in a direct-gain passive solar building. The results indicate that the building heating loads calculated by standard building energy analysis methods may be in error by as much as 50% as a result of their use of common assumptions regarding the convection processes which occur in an enclosure. It is also found that the convective heat transfer coefficients between the air and the enclosure surfaces can be substantially different from the values assumed in the standard building energy analysis methods, and can exhibit significant variations across a given surface.
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.
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.
Fractal Geometry and Spatial Phenomena A Bibliography
California at Santa Barbara, University of
Fractal Geometry and Spatial Phenomena A Bibliography January 1991 Mark MacLennan, A. Stewart. MEASUREMENT ISSUES........................................................... 8 II.1 ESTIMATION OF FRACTAL DIMENSION - GENERAL ISSUES .......... 8 II.2 ESTIMATION OF FRACTAL DIMENSION FOR CURVES/PROFILES ... 9 II.3
A combinatorial approach to discrete geometry
L. Bombelli; M. Lorente
2005-12-23T23:59:59.000Z
We present a paralell approach to discrete geometry: the first one introduces Voronoi cell complexes from statistical tessellations in order to know the mean scalar curvature in term of the mean number of edges of a cell. The second one gives the restriction of a graph from a regular tessellation in order to calculate the curvature from pure combinatorial properties of the graph. Our proposal is based in some epistemological pressupositions: the macroscopic continuous geometry is only a fiction, very usefull for describing phenomena at certain sacales, but it is only an approximation to the true geometry. In the discrete geometry one starts from a set of elements and the relation among them without presuposing space and time as a background.
Crystallization of carbon tetrachloride in confined geometries
Paris-Sud XI, UniversitÃ© de
1 Crystallization of carbon tetrachloride in confined geometries Adil Meziane1 , Jean-Pierre E 40 71 08 #12;2 Abstract The thermal behaviour of carbon tetrachloride confined in silica gels
Minimal five dimensional supergravities and complex geometries
Herdeiro, Carlos A. R. [Departamento Fisica, Faculdade de Ciencias, Universidade do Porto e Centro de Fisica do Porto, Rua do Campo Alegre, 687, 4169-007 Porto (Portugal)
2010-07-28T23:59:59.000Z
We discuss the relation between solutions admitting Killing spinors of minimal super-gravities in five dimensions, both timelike and null, and complex geometries. For the timelike solutions the results may be summarised as follows. In the ungauged case (vanishing cosmological constant {Lambda} 0) the solutions are determined in terms of a hyper-Kaehler base space; in the gauged case ({Lambda}<0) the complex geometry is Kaehler; in the de Sitter case ({Lambda}>0) the complex geometry is hyper-Kaehler with torsion (HKT). For the null solutions we shall focus on the de Sitter case, for which the solutions are determined by a constrained Einstein-Weyl 3-geometry called Gauduchon-Tod space. The method for constructing explicit solutions is discussed in each case.
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.
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.
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.
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.
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
On the Thermodynamic Geometry of Hot QCD
Stefano Bellucci; Vinod Chandra; Bhupendra Nath Tiwari
2010-10-07T23:59:59.000Z
We study the nature of the covariant thermodynamic geometry arising from the free energy of hot QCD. We systematically analyze the underlying equilibrium thermodynamic configurations of the free energy of 2- and 3-flavor hot QCD with or without including thermal fluctuations in the neighborhood of the QCD transition temperature. We show that there exists a well-defined thermodynamic geometric notion for QCD thermodynamics. The geometry thus obtained has no singularity as an intrinsic Riemannian manifold. We further show that there is a close connection of this geometric approach with the existing studies of correlations and quark number susceptibilities in hot QCD.
On the Thermodynamic Geometry of Hot QCD
Bellucci, Stefano; Tiwari, Bhupendra Nath
2008-01-01T23:59:59.000Z
We study the nature of the covariant thermodynamic geometry arising from the free energy of hot QCD. We systematically analyze the underlying equilibrium thermodynamic configurations of the free energy of 2- and 3-flavor hot QCD with or without including thermal fluctuations in the neighborhood of the QCD transition temperature. We show that there exists a well-defined thermodynamic geometric notion for QCD thermodynamics. The geometry thus obtained has no singularity as an intrinsic Riemannian manifold. We further show that there is a close connection of this geometric approach with the existing studies of correlations and quark number susceptibilities in hot QCD.
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.
Information Geometry and the Renormalization Group
Reevu Maity; Subhash Mahapatra; Tapobrata Sarkar
2015-03-13T23:59:59.000Z
Information theoretic geometry near critical points in classical and quantum systems is well understood for exactly solvable systems. Here we show that real space renormalization group equations can be used to construct the information metric and its associated quantities near criticality, even for systems that cannot be exactly solved. We study this metric in various cases and establish its scaling properties in several generic examples. Scaling relations on the parameter manifold involving scalar quantities are studied, and scaling exponents are identified. The meaning of the scalar curvature and the invariant geodesic distance in information geometry is established and substantiated from a renormalization group perspective.
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
Intrinsic Geometry of a Null Hypersurface
Pawe? Nurowski; David C. Robinson
2000-06-13T23:59:59.000Z
We apply Cartan's method of equivalence to construct invariants of a given null hypersurface in a Lorentzian space-time. This enables us to fully classify the internal geometry of such surfaces and hence solve the local equivalence problem for null hypersurface structures in 4-dimensional Lorentzian space-times.
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
March 23, 1997 GEOMETRY OPTIMIZATION \\Lambda
Schlick, Tamar
March 23, 1997 GEOMETRY OPTIMIZATION \\Lambda Tamar Schlick The Howard Hughes Medical Institute algorithm, largeÂscale optimization, line search, Newton's method, nonlinear optimization, quasi; Contents 1 Introduction 5 2 Basic Definitions of Optimization Problems 6 2.1 Problem Formulation
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.
Principles of algebraic geometry' (Griffiths and Harris).pdf
like a supernova. His conceptions of intrinsic geometry on a manifold, topology, function theory on a Riemann surface, birational transformations,.
GEOMETRY: OUR CULTURAL HERITAGE REVIEWED BY H. WU
Wu, Hung-Hsi
GEOMETRY: OUR CULTURAL HERITAGE REVIEWED BY H. WU Geometry: Our Cultural Heritage Audun Holme beginning in mathematics". The book is divided into two parts: Part I, entitled "A Cultural Heritage of a student who wants to learn some geometry for historical or cultural reasons. Part II will be reviewed
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
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.
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.
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.
Geometry of Majorana neutrino and new symmetries
G. G. Volkov
2006-07-30T23:59:59.000Z
Experimental observation of Majorana fermion matter gives a new impetus to the understanding of the Lorentz symmetry and its extension, the geometrical properties of the ambient space-time structure, matter--antimatter symmetry and some new ways to understand the baryo-genesis problem in cosmology. Based on the primordial Majorana fermion matter assumption, we discuss a possibility to solve the baryo-genesis problem through the the Majorana-Diraco genesis in which we have a chance to understand creation of Q(em) charge and its conservation in our D=1+3 Universe after the Big Bang. In the Majorana-Diraco genesis approach there appears a possibility to check the proton and electron non-stability on the very low energy scale. In particle physics and in our space-time geometry, the Majorana nature of the neutrino can be related to new types of symmetries which are lying beyond the binary Cartan-Killing-Lie algebras/superalgebras. This can just support a conjecture about the non-completeness of the SM in terms of binary Cartan--Killing--Lie symmetries/supersymmetries. As one of the very important applications of such new ternary symmetries could be related with explanation of the nature of the three families and three colour symmetry. The Majorana neutrino can directly indicate the existence of a new extra-dimensional geometry and thanks to new ternary space-time symmetries, could lead at high energies to the unextraordinary phenomenological consequences.
Horava-Lifshitz Gravity From Dynamical Newton-Cartan Geometry
Hartong, Jelle
2015-01-01T23:59:59.000Z
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 1
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.
Downstream hydraulic geometry relations: 2. Calibration and testing
Singh, Vijay P.; Yang, Chih Ted; Deng, Zhi-Qiang
2003-12-04T23:59:59.000Z
Downstream hydraulic geometry relations: 2. Calibration and testing Vijay P. Singh Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, Louisiana, USA Chih Ted Yang 1 Department of Civil Engineering, Colorado...; KEYWORDS: dynamic equilibrium, hydraulic geometry, maximum entropy, minimum energy dissipation, regime equations, stream power Citation: Singh, V. P., C. T. Yang, and Z.-Q. Deng, Downstream hydraulic geometry relations: 2. Calibration and testing, Water...
Surveying Diffusion in Complex Geometries. An Essay
Grebenkov, Denis
2009-01-01T23:59:59.000Z
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 whic...
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.
On the geometry of cosmological model building
Erhard Scholz
2005-11-21T23:59:59.000Z
This article analyzes the present anomalies of cosmology from the point of view of integrable Weyl geometry. It uses P.A.M. Dirac's proposal for a weak extension of general relativity, with some small adaptations. Simple models with interesting geometrical and physical properties, not belonging to the Friedmann-Lema\\^{\\i}tre class, are studied in this frame. Those with positive spatial curvature (Einstein-Weyl universes) go well together with observed mass density $\\Omega_m$, CMB, supernovae Ia data, and quasar frequencies. They suggest a physical role for an equilibrium state of the Maxwell field proposed by I.E. Segal in the 1980s (Segal background) and for a time invariant balancing condition of vacuum energy density. The latter leads to a surprising agreement with the BF-theoretical calculation proposed by C. Castro (2002).
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.
analytic geometries: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Phase Mask rejects all on-axis light for an unaberrated Lloyd, James P. 18 FINER FRACTAL GEOMETRY FOR ANALYTIC FAMILIES Mathematics Websites Summary: of meromorphic functions...
assembling process geometry: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
mental images, and IBM Research for their ongoing and contin Polthier, Konrad 3 3D fractal DNA assembly from coding, geometry and ALESSANDRA CARBONE1, Mathematics Websites...
analysis differential geometry: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Sci.1, 71 (1991), is given. Norihito Sasaki 1995-10-24 190 A Dodecalogue of Basic Didactics from Applications of Abstract Differential Geometry to Quantum Gravity General...
Evaluation of subsurface fracture geometry using fluid pressure...
subsurface fracture geometry using fluid pressure response to solid earth tidal strain Jump to: navigation, search OpenEI Reference LibraryAdd to library Report: Evaluation of...
Remarks on Hamiltonian structures in G{sub 2}-geometry
Cho, Hyunjoo, E-mail: cho@math.rochester.edu; Salur, Sema, E-mail: salur@math.rochester.edu [Department of Mathematics, University of Rochester, Rochester, New York 14627 (United States)] [Department of Mathematics, University of Rochester, Rochester, New York 14627 (United States); Todd, A. J., E-mail: ajtodd@math.ucr.edu [Department of Mathematics, University of California-Riverside, Riverside, California 92521 (United States)
2013-12-15T23:59:59.000Z
In this article, we treat G{sub 2}-geometry as a special case of multisymplectic geometry and make a number of remarks regarding Hamiltonian multivector fields and Hamiltonian differential forms on manifolds with an integrable G{sub 2}-structure; in particular, we discuss existence and make a number of identifications of the spaces of Hamiltonian structures associated to the two multisymplectic structures associated to an integrable G{sub 2}-structure. Along the way, we prove some results in multisymplectic geometry that are generalizations of results from symplectic geometry.
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
Information Geometry and Interior-Point Algorithms in SDP and ...
Satoshi Kakihara, Atsumi Ohara, Takashi Tsuchiya
2011-10-11T23:59:59.000Z
Sep 30, 2011 ... Page 1 ... Interplay between interior-point methods and differential geometry is an interesting topic studied by several authors. It was shown in ...
Influence of geometry on liquid oxygen magnetohydrodynamics
Boulware, Jeffrey C.; Ban, Heng [Department of Mechanical and Aerospace Engineering, Utah State University, 4130 Old Main Hill, Logan, UT 84322-4130 (United States); Jensen, Scott; Wassom, Steve [Space Dynamics Laboratory, Utah State University Research Foundation, 1695 North Research Park Way, North Logan, UT 84341 (United States)
2010-11-15T23:59:59.000Z
Magnetic fluid actuators have performed well in industrial applications, but have a limited temperature range due to the freezing point of the carrier fluid. Liquid oxygen (LOX) presents a pure, paramagnetic fluid suitable for use in a cryogenic magnetic fluid system; therefore, it is a potential solution to increasing the thermal range of magnetic fluid technology without the need for magnetic particles. The current study presents experimental work regarding the influence of geometry on the dynamics of a LOX slug in a 1.9 mm quartz tube when pulsed by a solenoid in a closed volume. A numerical analysis calculated the optimal solenoid geometry and balanced the magnetic, damping, and pressure forces to determine optimal slug lengths. Three configurations comprised the experiment: (1) a 24-gauge wire solenoid with an optimized 2.7 cm length slug, (2) a 30-gauge wire solenoid with an optimized 1.3 cm length slug, and (3) a 30-gauge wire solenoid with a nonoptimized 2.5 cm length slug. Typically, the hydrodynamic breakdown limit is calculated and used to determine the system range; however the experiment showed that the hydrodynamic breakdown limit was never reached by the slug. This implied that, instead, the system range should factor in a probabilistic risk of failure calculated as a function of the induced pressure change from its oscillations. The experimental data were also used to establish a nondimensional relationship between the maximum displacement and initial magnetic pressure on the slug. The average initial velocity of the slug was found to be proportional to the initial magnetic pressure, Mason number, and slug length. The results of this study can be used in the design and optimization of a LOX fluid system for space or low-temperature applications. (author)
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.
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. (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.
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.
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
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
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
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.
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
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...
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.
UNCORRECTED Grid geometry effects on convection in ocean climate models
Kuhlbrodt, Till
UNCORRECTED PROOF Grid geometry effects on convection in ocean climate models: a conceptual study is the 12 improvement of convection parameterization schemes, but the question of grid geometry also plays to an at- 14 mosphere model. Such ocean climate models have mostly structured, coarsely resolved grids. 15
Proceedings of 13th Geometry-Topology Conference
Ng, Lenny
. Proposition 1 (Cromwell [Cro]). The map G K sending grid diagrams to topological knots induces a bijection KProceedings of 13th GÂ¨okova Geometry-Topology Conference pp. 1 Â 17 Grid Diagrams, Braids, and Contact Geometry Lenhard Ng and Dylan Thurston Abstract. We use grid diagrams to present a unified picture
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
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
conditions showed a temporary pH decrease, with a concomitant increase in formic acid during exponential growth. Fermentation experiments performed outside of the magnet...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
conditions showed a temporary pH decrease, with a concomitant increase in formic acid during exponential growth. Fermentation experiments performed outside of the magnet...
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.
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.
Five Dimensional Minimal Supergravities and Four Dimensional Complex Geometries
Grover, Jai [DAMTP, CMS, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA (United Kingdom); Gutowski, Jan B. [Department of Mathematics, King's College London, Strand, London WC2R 2LS (United Kingdom); Herdeiro, Carlos A. R. [DF-FCUP e CFP, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto (Portugal); Sabra, Wafic [Centre for Advanced Mathematical Sciences and Physics Department, American University of Beirut (Lebanon)
2009-05-01T23:59:59.000Z
We discuss the relation between solutions admitting Killing spinors of minimal supergravities in five dimensions and four dimensional complex geometries. In the ungauged case (vanishing cosmological constant {lambda} 0) the solutions are determined in terms of a hyper-Kaehler base space; in the gauged case ({lambda}<0) the complex geometry is Kaehler; in the de Sitter case ({lambda}>0) the complex geometry is hyper-Kaehler with torsion (HKT). In the latter case some details of the derivation are given. The method for constructing explicit solutions is discussed in each case.
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.
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...
Fractal geometry predicts varying body size scaling relationships
Minnesota, University of
.............................................................. Fractal geometry predicts varying scaling based on fractal resource distributions, in which resource encounter rates are a function of body that are multiples of 1/4, which have been recently explained from the fractal branching architecture of organisms4
Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry
Haward, Simon J.
A precision-machined cross-slot flow geometry with a shape that has been optimized by numerical simulation of the fluid kinematics is fabricated and used to measure the extensional viscosity of a dilute polymer solution. ...
active site geometries: Topics by E-print Network
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hydrodynamics, is finally introduced to account for the equilibrium probability distribution of the vortex sizes. Luca Giomi 2014-09-04 5 The Accretion Geometry in Radio-Loud...
active site geometry: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
hydrodynamics, is finally introduced to account for the equilibrium probability distribution of the vortex sizes. Luca Giomi 2014-09-04 5 The Accretion Geometry in Radio-Loud...
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 wells quantifies a much...
Geometry-Based Sampling of Conformational Transitions in Proteins
de Groot, Bert
Structure Article Geometry-Based Sampling of Conformational Transitions in Proteins Daniel Seeliger of the binding site when using a holo structure, or by not identifying the correct binding pose when using an apo
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 ...
The impact of grid geometry on displacement calculations
Jimenez Arismendi, Eduardo A.
2004-11-15T23:59:59.000Z
Reservoir simulation models are becoming increasingly sophisticated in tandem with the rapid development of geological modeling methods. Widely used commercial simulators usually model flow through heavily faulted and structurally complex geometries...
A Simple, Fast Method of Estimating Fractured Reservoir Geometry...
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...
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
ARRANGEMENTS OF HYPERPLANES Algebra, Combinatorics, Geometry and Topology
Feichtner, Eva Maria - Fachbereich 3
ARRANGEMENTS OF HYPERPLANES Algebra, Combinatorics, Geometry and Topology Centro Stefano Franscini Islands, or panorama hike in the hills above Ascona. 19.00 Departure for the conference dinner from Monte
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.
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 ...
Influence of geometry on natural convection in buildings
White, M.D.; Winn, C.B.; Jones, G.F.; Balcomb, J.D.
1985-01-01T23:59:59.000Z
Strong free convection airflows occur within passive solar buildings resulting from elevated temperatures of surfaces irradiated by solar energy compared with the cooler surfaces not receiving radiation. The geometry of a building has a large influence on the directions and magnitudes of natural airflows, and thus heat transfer between zones. This investigation has utilized a variety of reduced-scale building configurations to study the effects of geometry on natural convection heat transfer. Similarity between the reduced-scale model and a full-scale passive solar building is achieved by having similar geometries and by replacing air with Freon-12 gas as the model's working fluid. Filling the model with Freon-12 gas results in similarity in Prandtl numbers and Rayleigh numbers based on temperature differences in the range from 10/sup 9/ to 10/sup 11/. Results from four geometries are described with an emphasis placed on the effects of heat loss on zone temperature stratification shifts.
Determining Transition State Geometries in Liquids Using 2D-IR
Cahoon, James
2008-01-01T23:59:59.000Z
Material Determining transition state geometries in liquidsDetermining transition state geometries in liquids using 2D-are determined by the transition state connecting reactant
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.
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
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
Sottile, Frank
, machine learning, opti- mization, robotics, computational geometry, and statistics. We will welcome of this proposal. 3. Overlap with ot
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.
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.
Mind the Gap: Supersymmetry Breaking in Scaling, Microstate Geometries
Orestis Vasilakis; Nicholas P. Warner
2011-06-30T23:59:59.000Z
We use a multi-species supertube solution to construct an example of a scaling microstate geometry for non-BPS black rings in five dimensions. We obtain the asymptotic charges of the microstate geometry and show how the solution is related to the corresponding non-BPS black ring. The supersymmetry is broken in a very controlled manner using holonomy and this enables a close comparison with a scaling, BPS microstate geometry. Requiring that there are no closed time-like curves near the supertubes places additional restrictions on the moduli space of physical, non-BPS solutions when compared to their BPS analogs. For large holonomy the scaling non-BPS solution always has closed time-like curves while for smaller holonomy there is a "gap" in the non-BPS moduli space relative to the BPS counterpart.
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.
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.
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.
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.
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.
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.
Asphaltene damage in matrix acidizing
Hinojosa, Roberto Antonio
1996-01-01T23:59:59.000Z
REVIEW CONSTRUCTION OF APPARATUS . DESCRIPTION OF CORE SAMPLES DESIGN OF EXPERIMENTAL ACID TREATMENT . . . ACIDIZING RESULTS BRINE SATURATED CORE L1D ACIDIZING RESULTS BRINE/CRUDE OIL SATURATED CORE S2A . . . ACIDIZING RESULTS BRINE/KEROSENE OIL... experiment they used HCl saturated kerosene to test the same crude samples. Deposition occurred with the HCl saturated acid. The authors concluded, though deposition at an interface was preferential, sludge formation did not require an interface. Moore et...
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.
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.
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.
Fractal geometry of spinglass models J. F. Fontanari
Stadler, Peter F.
Fractal geometry of spinÂglass models J. F. Fontanari Instituto de Fâ??ï¿½sica de Sâ?ao Carlos through saddle s, and D is the fractal dimension of the phase space. PACS 75.10.Nr (principal), 87.23.Kg
Fractal geometry of spin-glass models J. F. Fontanari
Stadler, Peter F.
Fractal geometry of spin-glass models J. F. Fontanari Instituto de FÂ´isica de S~ao Carlos saddle s, and D is the fractal dimension of the phase space. PACS 75.10.Nr (principal), 87.23.Kg
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
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.
Decay Rates for Spherical Scalar Waves in the Schwarzschild Geometry
Johann Kronthaler
2007-09-24T23:59:59.000Z
The Cauchy problem is considered for the scalar wave equation in the Schwarzschild geometry. Using an integral spectral representation we derive the exact decay rate for solutions of the Cauchy problem with spherical symmetric initial data, which is smooth and compactly supported outside the event horizon.
MATH 230a: DIFFERENTIAL GEOMETRY Fall 2012 Syllabus
Lau, Siu-Cheong
of length and energy Chern class Chern connections of complex manifolds Moment map in gauge theory. Differential Geometry: Bundles, Connections, Metrics and Curvature. Oxford Graduate Texts in Mathematics, Vol integrability theorem Exponential map of matrices Basic notions Tubular neighborhood theorem Canonical
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
Transferability of cleavage fracture parameters between notched and cracked geometries
Boyer, Edmond
and specimen geometry dependence of cleavage fracture micromechanisms of a French pressure vessel steel (A508 that only NT tests with a mean fracture strain lower than 25% have to be considered to make sure ; Â¢ 50 Â£ C ]. Also a unique set of Weibull parameters was found to describe all the NT tests over
Load Alleviation on Wind Turbine Blades using Variable Airfoil Geometry
Load Alleviation on Wind Turbine Blades using Variable Airfoil Geometry Peter Bjørn Andersen, Mac Loads, Trailing Edge Flaps, PID control, Signal Noise. 1 Introduction Wind turbine blades are subject to 40% when signal noise is added to the control. Keywords: Wind Turbine, Load Alleviation, Fatigue
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.
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
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
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
A Clifford Bundle Approach to the Differential Geometry of Branes
Waldyr A. Rodrigues Jr.; Samuel Wainer
2014-05-04T23:59:59.000Z
The Clifford bundle formalism (CBF) of differential forms and the theory of extensors acting on $\\mathcal{C\\ell}(M,g)$ is first used for a fomulation of the intrinsic geometry of a differential manifold $M$ equipped with a metric field $\\boldsymbol{g}$ of signature $(p,q)$ and an arbitrary metric compatible connection $\
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
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
Polymer geometry and Li+ conduction in poly(ethylene oxide)
Averbuch, Amir
Polymer geometry and Li+ conduction in poly(ethylene oxide) L. Gitelman a , M. Israeli b, , A: Lithium battery Polymer molecule Brownian motion Simulation Conductivity PEO a b s t r a c t We study of the amorphous PE structure is increased by mechanical stretching due to the unraveling of loops in the polymer
BULK MICROMACHINED TITANIUM MICROMIRROR DEVICE WITH SLOPING ELECTRODE GEOMETRY
MacDonald, Noel C.
BULK MICROMACHINED TITANIUM MICROMIRROR DEVICE WITH SLOPING ELECTRODE GEOMETRY Masa P. Rao1 , Marco micromachined hybrid torsional micromirror device composed of titanium mirror structures bonded to an underlying time, high aspect ratio micromachining capability in bulk titanium; and 2) the High Aspect Ratio
Study of particle pumping characteristics for different pumping geometries in
Karney, Charles
Study of particle pumping characteristics for different pumping geometries in JT-60U and DIII, Princeton, New Jersey, United States of America Abstract. Particle pumping characteristics were compared between pumping from the inner side private flux region (IPP) and pumping from both sides of the private
The Geometry of Stochastic Reduction of an Entangled System
Ari Belenkiy; Steve Shnider; Lawrence Horwitz
2006-09-19T23:59:59.000Z
We show that the method of stochastic reduction of linear superpositions can be applied to the process of disentanglement for the spin-0 state of two spin-1/2 particles. We describe the geometry of this process in the framework of the complex projective space
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.
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
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
Study of Influence of Electrode Geometry on Impedance Spectroscopy
Ahmed, Riaz; Reifsnider, Kenneth L
2011-01-01T23:59:59.000Z
Electrochemical Impedance Spectroscopy (EIS) is a powerful and proven tool for analyzing AC impedance response. A conventional three electrode EIS method was used to perform the investigation in the present study. Saturated potassium chloride solution was used as the electrolyte and three different material rods were used as working electrodes. Different configurations of electrode area were exposed to the electrolyte as an active area to investigate electrode geometry effects. Counter to working electrode distance was also altered while keeping the working electrode effective area constant to explore the AC response dependence on the variation of ion travel distance. Some controlled experiments were done to validate the experimental setup and to provide a control condition for comparison with experimental results. A frequency range of 100 mHz to 1 MHz was used for all experiments. In our analysis, we have found a noteworthy influence of electrode geometry on AC impedance response. For all electrodes, impedance decreases with the increase of effective area of the electrolyte. High frequency impedance is not as dependent on geometry as low frequency response. The observed phase shift angle drops in the high frequency region with increased working electrode area, whereas at low frequency the reverse is true. Resistance and capacitive reactance both decrease with an increase of area, but resistance response is more pronounce than reactance. For lower frequencies, small changes in working area produce very distinctive EIS variations. Electrode material as well as geometry was systematically varied in the present study. From these and other studies, we hope to develop a fundamental foundation for understanding specific changes in local geometry in fuel cell (and other) electrodes as a method of designing local morphology for specific performance.
acid succinic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
simulated the laser heating of the succinic acid (this data is still simulation is that infrared heating generates about 10-15 more succinic acid molecules bound to the analyte...
acid docosahexaenoic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 38 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid aspartic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 20 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid caffeic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 11 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid propionic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 19 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid sorbic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 9 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid benzoic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 24 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid propanoic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 9 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid methoxyacetic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 7 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid eicosapentaenoic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 18 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acids eicosapentaenoic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 18 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid acetylsalicylic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 10 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid dichloroacetic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 7 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid oleic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 31 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
Recovery of Carboxylic Acids from Fermentation Broth via Acid Springing
Dong, Jipeng
2010-01-14T23:59:59.000Z
RECOVERY OF CARBOXYLIC ACIDS FROM FERMENTATION BROTH VIA ACID SPRINGING A Thesis by JIPENG DONG 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 December 2008 Major Subject: Chemical Engineering RECOVERY OF CARBOXYLIC ACIDS FROM FERMENTATION BROTH VIA ACID SPRINGING A Thesis by JIPENG DONG Submitted to the Office of Graduate Studies of Texas A...
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...
Quadratic voltage profiles in lead acid cells during slow, steady processes
Haaser, Robert Anthony
1999-01-01T23:59:59.000Z
studies have been conducted, in the past, on batteries and battery materials, but details about the fields and potentials within a cell's electrolyte have been, for the most part, overlooked. A detailed theory of steady state pmcesses in lead acid cells... during the slow, steady processes ? charge, discharge, and rehxation ? of any voltaic cell in a one-dimensional geometry. The condition of electro-neutrality in the battery cell's electrolyte implies that the electric field is uniform across the cell...
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.
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.
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.
Not Available
1981-01-01T23:59:59.000Z
A report is given of an address by Kathleen Bennett, Assistant Administrator of Air, Noise and Radiation, Environmental Protection Agency which was presented to the US Senate Committee on the Environment and Public Works. Bennet explained that in view of the many unknowns about acid rain, and the possible substantial cost burden of additional controls, EPA is proceeding with its program to investigate this environmental malady over a 10-year period. The three major areas of the research program are (1) transport, transformation, and deposition processes, (2) effects of acid deposition, and (3) assessments and policy studies. Other issues discussed were global transboundary air pollution and Senate amendments addressing long-range transport. (JMT)
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.
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.
Chiral Topological Insulator on Nambu 3-Algebraic Geometry
Kazuki Hasebe
2014-08-02T23:59:59.000Z
Chiral topological insulator (AIII-class) with Landau levels is constructed based on the Nambu 3-algebraic geometry. We clarify the geometric origin of the chiral symmetry of the AIII-class topological insulator in the context of non-commutative geometry of 4D quantum Hall effect. The many-body groundstate wavefunction is explicitly derived as a $(l,l,l-1)$ Laughlin-Halperin type wavefunction with unique $K$-matrix structure. Fundamental excitation is identified with anyonic string-like object with fractional charge ${1}/({1+2(l-1)^2})$. The Hall effect of the chiral topological insulators turns out be a color version of Hall effect, which exhibits a dual property of the Hall and spin-Hall effects.
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.
Generalized quantum gravity condensates for homogeneous geometries and cosmology
Daniele Oriti; Daniele Pranzetti; James P. Ryan; Lorenzo Sindoni
2015-01-05T23:59:59.000Z
We construct a generalized class of quantum gravity condensate states, that allows the description of continuum homogeneous quantum geometries within the full theory. They are based on similar ideas already applied to extract effective cosmological dynamics from the group field theory formalism, and thus also from loop quantum gravity. However, they represent an improvement over the simplest condensates used in the literature, in that they are defined by an infinite superposition of graph-based states encoding in a precise way the topology of the spatial manifold. The construction is based on the definition of refinement operators on spin network states, written in a second quantized language. The construction lends itself easily to be applied also to the case of spherically symmetric quantum geometries.
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).
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.
TUGboat, Volume 0 (2060), No. 0 1001 A complex drawing in descriptive geometry
Roegel, Denis
2060-01-01T23:59:59.000Z
TUGboat, Volume 0 (2060), No. 0 1001 Graphics A complex drawing in descriptive geometry Denis Roegel Abstract This article describes the reproduction of a complex drawing in descriptive geometry be in descriptive geometry. In this article, I go into the details of the con- struction of a complex drawing, taken
Simulation of Biological Flow and Transport in Complex Geometries using Embedded Boundary /
Simulation of Biological Flow and Transport in Complex Geometries using Embedded Boundary / Volume for modeling polymer fluids in irregular microscale geometries that enables long-time simulation of validation the constitutive behavior of polymer fluids. Complex flow environment geometries are represented on Cartesian grids
Geometry Optimization of Kringle 1 of Plasminogen Using the PM3
Schlegel, H. Bernhard
Geometry Optimization of Kringle 1 of Plasminogen Using the PM3 Semiempirical Method ANDREW D July 1999 ABSTRACT: The results of a geometry optimization on the 1226 atom Kringle 1 of plasminogen with a conjugate gradient density matrix search replacing the diagonalization step. The geometry was optimized
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.
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.
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...
acid acetic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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...
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.
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.
Global geometry of space-time with the charged shell
V. A. Berezin; V. I. Dokuchaev
2014-04-10T23:59:59.000Z
It is elaborated the complete classification of the possible types of the spherically symmetric global geometries for two types of electrically charged shells: (1) The charged shell as a single source of the gravitational field, when internal space-time is flat, and external space-time is the Reissner--Nordstr\\"om metric; (2) The neutralizing shell with an electric charge opposite to the charge of the internal source with the Reissner--Nordstr\\"om metric and with the Schwarzschild metric outside the shell.
The Bryant-Salamon G_2 manifolds and hypersurface geometry
Reiko Miyaoka
2006-06-02T23:59:59.000Z
We show that two of the Bryant-Salamon G_2-manifolds have a simple topology ; homeomorphic to the complement of some submanifolds of the 7-dimensional sphere. In this connection, we show there exists a complete Ricci-flat (non-flat) metric on the complement of an m-dimensional sphere in an n-dimensional sphere for some n-1>m. We also give many examples of special Lagrangian submanifolds of the cotangent bundle of the sphere with the Stenzel metric. Hypersurface geometry is essential in the argument.
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.
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.
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.
Organic Phosphoric Acid of the Soil.
Fraps, G. S. (George Stronach)
1911-01-01T23:59:59.000Z
. ................................................ introduction 5 .............................. hmmonia-Soluble Phosphoric Acid 5 ................ Solubility of Phosphates in Ammonia 6 I Fixation of Phosphoric Acid from Ammonia .......... 7 Effect of Ratio of Soil to Solvent in Extraction of Phos- I I... .............. phoric Acid by Acid and Ammonia 7 I ........ Other Soil Constituents Dissolved by Ammonia 8 ................... Solution of Fixed Phosphoric Acid 10 ................ ormation of Ammonia-Solubla Phosphoric Acid 11 ....... hosphoric Acid Dissolved...
acidic alpha-amino acids: Topics by E-print Network
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acid indicated that more succinic acid... Gilliland, Patti Lynn 2012-06-07 24 A ACID RAIN Audrey Gibson Geosciences Websites Summary: , oxygen, and oxidants to form...
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
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.
Lorentzian AdS geometries, wormholes, and holography
Arias, Raul E.; Silva, Guillermo A. [IFLP-CONICET and Departamento de Fisica Facultad de Ciencias Exactas, Universidad Nacional de La Plata , CC 67, 1900, La Plata (Argentina); Botta Cantcheff, Marcelo [Theory Division, CERN, 1211 Geneva 23 (Switzerland); IFLP-CONICET and Departamento de Fisica Facultad de Ciencias Exactas, Universidad Nacional de La Plata , CC 67, 1900, La Plata (Argentina)
2011-03-15T23:59:59.000Z
We investigate the structure of two-point functions for the quantum field theory dual to an asymptotically Lorentzian Anti de Sitter (AdS) wormhole. The bulk geometry is a solution of five-dimensional second-order Einstein-Gauss-Bonnet gravity and causally connects two asymptotically AdS spacetimes. We revisit the Gubser-Klebanov-Polyakov-Witten prescription for computing two-point correlation functions for dual quantum field theories operators O in Lorentzian signature and we propose to express the bulk fields in terms of the independent boundary values {phi}{sub 0}{sup {+-}} at each of the two asymptotic AdS regions; along the way we exhibit how the ambiguity of normalizable modes in the bulk, related to initial and final states, show up in the computations. The independent boundary values are interpreted as sources for dual operators O{sup {+-}} and we argue that, apart from the possibility of entanglement, there exists a coupling between the degrees of freedom living at each boundary. The AdS{sub 1+1} geometry is also discussed in view of its similar boundary structure. Based on the analysis, we propose a very simple geometric criterion to distinguish coupling from entanglement effects among two sets of degrees of freedom associated with each of the disconnected parts of the boundary.
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.
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.
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
Tautges, T. J.; Jain, R.; Mathematics and Computer Science
2010-01-01T23:59:59.000Z
Nuclear reactor cores are constructed as rectangular or hexagonal lattices of assemblies, where each assembly is itself a lattice of fuel, control, and instrumentation pins, surrounded by water or other material that moderates neutron energy and carries away fission heat. We describe a system for generating geometry and mesh for these systems. The method takes advantage of information about repeated structures in both assembly and core lattices to simplify the overall process. The system allows targeted user intervention midway through the process, enabling modification and manipulation of models for meshing or other purposes. Starting from text files describing assemblies and core, the tool can generate geometry and mesh for these models automatically as well. Simple and complex examples of tool operation are given, with the latter demonstrating generation of meshes with 12 million hexahedral elements in less than 30 minutes on a desktop workstation, using about 4 GB of memory. The tool is released as open source software as part of the MeshKit mesh generation library.
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.
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.
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.
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.
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.
Oscillation modes of dc microdischarges with parallel-plate geometry
Stefanovi?, Ilija; Škoro, Nikola; Mari?, Dragana; Petrovi?, Zoran Lj; Winter, Jörg
2011-01-01T23:59:59.000Z
Two different oscillation modes in microdischarge with parallel-plate geometry has been observed: relaxation oscillations with frequency range between 1.23 and 2.1 kHz and free-running oscillations with 7 kHz frequency. The oscillation modes are induced by increasing power supply voltage or discharge current. For a given power supply voltage, there is a spontaneous transition from one to other oscillation mode and vice versa. Before the transition from relaxation to free-running oscillations, the spontaneous increase of oscillation frequency of relaxation oscillations form 1.3 kHz to 2.1 kHz is measured. Fourier Transform Spectra of relaxation oscillations reveal chaotic behaviour of microdischarge. Volt-Ampere characteristics associated with relaxation oscillations describes periodical transition between low current, diffuse discharge and normal glow. However, free-running oscillations appear in subnormal glow only.
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 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.
The Discrete Geometry of a Small Causal Diamond
Mriganko Roy; Debdeep Sinha; Sumati Surya
2012-12-04T23:59:59.000Z
We study the discrete causal set geometry of a small causal diamond in a curved spacetime using the average abundance of k-element chains or total orders in the underlying causal set C. We begin by obtaining the first order curvature corrections to the flat spacetime expression for the abundance using Riemann normal coordinates. For fixed spacetime dimension this allows us to find a new expression for the discrete scalar curvature of C as well as the time-time component of its Ricci tensor in terms of the abundances of k-chains. We also find a new dimension estimator for C which replaces the flat spacetime Myrheim-Meyer estimator in generic curved spacetimes.
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.
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.
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.
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.
acetic acid solutions: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
arachidonic acid activation: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid inertness studies: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid alleviates decreases: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid activated montmorillonite: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid amide hydrolase: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been studied....
acid chelation phototherapeutic: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid phosphatase activity: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acetic acid solution: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid 2-benzothiazolylthiomethyl ester: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acetic acid operational: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid phosphatase activities: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid sphingomyelinase activity: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acids decreases fibrinolysis: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid potassium glycyrrhetinate: Topics by E-print Network
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In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
arachidonic acid activates: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid decarboxylase activity: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid activates nrf2: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid processing activity: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
ascorbic acid enhances: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid incorporating poloxamer: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acid cupric chloride: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
acids increase cardiovascular: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In the present study, bonding among formic, acetic and benzoic acids, sulfuric acid, ammonia, acetic, and benzoic acids with free and hydrated sulfuric acid has been...
In vivo incorporation of unnatural amino acids
Schultz, Peter G. (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 L. (Philadelphia, PA); Mehl, Ryan Aaron (Lancaster, PA); Pastrnak, Miro (San Diego, CA); Santoro, Stephen William (Cambridge, MA); Zhang, Zhiwen (San Diego, CA)
2012-05-08T23:59:59.000Z
The invention provides methods and compositions for in vivo incorporation of unnatural amino acids. Also provided are compositions including proteins with unnatural amino acids.
Carbonic Acid Shows Promise in Geology, Biology
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
The Surprising Secrets of Carbonic Acid Probing the Surprising Secrets of Carbonic Acid Berkeley Lab Study Holds Implications for Geological and Biological Processes October 23,...
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) ...
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....
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 ...
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 fast solver for the Stokes equations with distributed forces in complex geometries 1
Mohri, Mehryar
A fast solver for the Stokes equations with distributed forces in complex geometries 1 George Biros geometries in a black-box fashion; (2) it is second order accurate; and (3) it has optimal algorithmic complexity. Our approach, to which we refer as the Embedded Boundary Integral method, is based on Anita Mayo
Workshop on Linear Logic Geometry of Interaction, Traced Monoidal Categories and Implicit Complexity
Banbara, Mutsunori
on Linear Logic Geometry of Interaction, Traced Monoidal Categories and Implicit Complexity of Interaction for Polarized Linear Logic We present a Geometry of Interaction (GoI) model for the multiplicative & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & Date: 7th November 2011 11th November 2011 Venue: Room 110, Faculty of Science Building No.3, Kyoto
Neutron Noise Calculations in Hexagonal Geometry and Comparison with Analytical Solutions
DemaziÃ¨re, Christophe
for addressing the noise calculations of light water reactors ~LWRs! in Cartesian geometries.3 This tool instability, etc. Extension of the noise calculation method to other reactor types such as Russian VVERsNeutron Noise Calculations in Hexagonal Geometry and Comparison with Analytical Solutions Hoai Nam
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
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
SIMULATION OF GEOMETRY AND SHADOW EFFECTS IN 3D ORGANIC POLYMER SOLAR CELLS
Kassegne, Samuel Kinde
levels of Solar panels and new production capacity is driving solar PV prices lower and thereby, bringingSIMULATION 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
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.
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
Krysl, Svatopluk
C -algebras Oscillator or Segal-Shale-Weil representation Geometry: Associating the oscillator or Segal-Shale-Weil representation Geometry: Associating the oscillator to symplectic manifolds Global and (x) = 0 implies x = 0 2 S. KrÃ½sl #12;C -algebras Oscillator or Segal-Shale-Weil representation
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
Fast Constructive-Solid Geometry Display in the Pixel-Powers Graphics System
North Carolina at Chapel Hill, University of
Fast Constructive-Solid Geometry Display in the Pixel-Powers Graphics System · Technical Report 86 for PublieatioD #12;Fast Constructive-Solid Geometry Display In the Pixel-Powers Graphics System Jack Goldfeather Hill ABSTRACT We present two algorithms for the display of CSG-defined objects on Pixel-Powers
Ramírez, Jorge A.
On downstream hydraulic geometry and optimal energy expenditure: case study of the Ashley Abstract The downstream distribution of channel geometry and of the rate of energy expenditure per unit the network. We look at energy expenditure from two perspectives. (1) In the context of downstream hydraulic
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 calculation, have been very successful in describing large systems. Geometry optimization methods can take). A series of microit- erations can be employed to fully optimize the MM region for each optimization step
Geometry optimization methods for modeling large molecules O don Farkasa,*, H. Bernhard Schlegelb
Schlegel, H. Bernhard
Geometry optimization methods for modeling large molecules OÂ¨ doÂ¨n Farkasa,*, H. Bernhard Schlegelb, Wayne State University, Detroit, USA Abstract Geometry optimization is an essential part of quantum that there are different requirements for a chosen optimization method. The proposed method aims to meet two requirements
Gobbert, Matthias K.
COMSOL Modeling of Groundwater Flow and Contaminant Transport in Two-Dimensional Geometries, Environmental Sys- tems. 1 Introduction Groundwater contributes an large portion of stream flow and subsequently% of a streams nitrogen load has been discharged from groundwater. The surficial aquifer geometry in this area
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.
The 3D Geometry of Dark Matter Halos
J. -F. Becquaert; F. Combes
1997-04-10T23:59:59.000Z
The thickness of the neutral hydrogen layer, coupled with the rotation curve, traces the outer dark matter potential. We estimate the amplitude of the flaring in spiral galaxies from a 3D model of the HI gas. Warps in particular are explicitly parametrized in the form of an harmonical density wave. Applying our method to the galaxy NGC 891, the only model that could fit the observations, and in particular the HI at large height above the plane, includes a strong warp with a line of node almost coinciding with the line of sight. This high-Z HI is not observed at the most extreme velocity channels, those corresponding to high rotational velocities. This is accounted for by the model, since orbits in the tilted planes are not circular, but elongated, with their minor axis in the galaxy plane. Their velocity on the major axis (i.e. at their maximal height above the plane) is then 30% less than in the plane. We finally connect the modelled vertical outer gaseous distribution to the dark matter through hydrodynamical and gravitational equations. Under the assumption of isotropy of the gaseous velocity dispersion, we conclude on a very flattened halo geometry for the galaxy NGC 891 ($q \\approx 0.2$), while a vertical velocity dispersion smaller that the radial one would lead to a less flattened Dark Matter Halo ($q \\approx 0.4-0.5$). Both results however suggests that dark matter is dissipative or has been strongly influenced by the gas dynamics.
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.
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.
Disordered Topological Insulators: A Non-Commutative Geometry Perspective
Emil Prodan
2010-12-22T23:59:59.000Z
This review deals with strongly disordered topological insulators and covers some recent applications of a well established analytic theory based on the methods of Non-Commutative Geometry (NCG) and developed for the Integer Quantum Hall-Effect. Our main goal is to exemplify how this theory can be used to define topological invariants in the presence of strong disorder, other than the Chern number, and to discuss the physical properties protected by these invariants. Working with two explicit 2-dimensional models, one for a Chern insulator and one for a Quantum spin-Hall insulator, we first give an in-depth account of the key bulk properties of these topological insulators in the clean and disordered regimes. Extensive numerical simulations are employed here. A brisk but self-contained presentation of the non-commutative theory of the Chern number is given and a novel numerical technique to evaluate the non-commutative Chern number is presented. The non-commutative spin-Chern number is defined and the analytic theory together with the explicit calculation of the topological invariants in the presence of strong disorder are used to explain the key bulk properties seen in the numerical experiments presented in the first part of the review.
Gravitational perturbations of the Kerr geometry: High-accuracy study
Gregory B. Cook; Maxim Zalutskiy
2014-11-19T23:59:59.000Z
We present results from a new code for computing gravitational perturbations of the Kerr geometry. This new code carefully maintains high precision to allow us to obtain high-accuracy solutions for the gravitational quasinormal modes of the Kerr space-time. Part of this new code is an implementation of a spectral method for solving the angular Teukolsky equation that, to our knowledge, has not been used before for determining quasinormal modes. We focus our attention on two main areas. First, we explore the behavior of these quasinormal modes in the extreme limit of Kerr, where the frequency of certain modes approaches accumulation points on the real axis. We compare our results with recent analytic predictions of the behavior of these modes near the accumulation points and find good agreement. Second, we explore the behavior of solutions of modes that approach the special frequency $M\\omega=-2i$ in the Schwarzschild limit. Our high-accuracy methods allow us to more closely approach the Schwarzschild limit than was possible with previous numerical studies. Unlike previous work, we find excellent agreement with analytic predictions of the behavior near this special frequency. We include a detailed description of our methods, and make use of the theory of confluent Heun differential equations throughout. In particular, we make use of confluent Heun polynomials to help shed some light on the controversy of the existence, or not, of quasinormal and total-transmission modes at certain special frequencies in the Schwarzschild limit.
$?$-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.
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.
Succinic acid production by Anaerobiospirillum succiniciproducens
, succinic acid has been produced commercially by chemical processes. Recently, however, fermentative of bacteria produce succinic acid as a fermentation end product,4 7 few species can produce it as the major 10 Previous studies showed that A. succiniciproducens produces succinic acid and acetic acid
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, 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.
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.
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
HYDROFLUORIC ACID FIRST AID INSTRUCTIONS
Jalali. Bahram
with large amounts of cool running water. Immediately washing off the acid is of primary importance. 2.Remove Immediately flush eyes for at least 15 minutes with copious cool flowing water. 2 If only one eye is affected by a glass of milk or milk of magnesia. 3 Call 911 for immediate medical assistance. REMEMBER, ALL PERSONNEL
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
Maduri, Rajesh Kumar
2008-02-01T23:59:59.000Z
The primary focus of this thesis is to present a framework to develop higher order global differentiability local approximations for 2-D and 3-D distorted element geometries. The necessity and superiority of higher order global differentiability...
Adsorption geometry of CO versus coverage on TiO2(110) from s...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
of CO versus coverage on TiO2(110) from s- and p-polarized infrared spectroscopy. Adsorption geometry of CO versus coverage on TiO2(110) from s- and p-polarized infrared...
Melnik, Roderick
plasma etching of polycrystalline diamond films [7], microwave plasma assisted chemical vapor deposition. For theoretical calculations of proper- ties of nanosized diamond materials, polycrystalline diamond thin filmsGeometry and temperature dependent thermal conductivity of diamond nanowires: A non
Scattering of Dirac Fermions in Barrier Geometries on the Surface of Topological Insulators
Torquato, Salvatore
Scattering of Dirac Fermions in Barrier Geometries on the Surface of Topological Insulators Lindsay Fleischer 1 Introduction Predicted theoretically and discovered experimentally, the topological insulators topological in- sulators and the trivial insulating vacuum have wavefunctions which are not smoothly
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 ...
TR 2006/002 ISSN 0874-338X GeoThms -Geometry Framework
Almeida, Pedro Quaresma de
& Montenegro Centre for Informatics and Systems of the University of Coimbra #12;GeoThms - Geometry Framework 11000 Belgrade, SERBIA & MONTENEGRO e-mail: janicic@matf.bg.ac.yu April 24, 2006 1 This work
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, ...
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...
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
Math 125 Calculus and Analytic Geometry II Winter 2008 Instructor Amites Sarkar
Sarkar, Amites
Math 125 Calculus and Analytic Geometry II Winter 2008 Instructor Amites Sarkar Text Calculus and Fridays, in 216 Bond Hall. My phone number is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;
Math 224 Multivariable Calculus and Analytic Geometry I Winter 2013 Instructor Amites Sarkar
Sarkar, Amites
Math 224 Multivariable Calculus and Analytic Geometry I Winter 2013 Instructor Amites Sarkar Text phone number is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;Course Objectives The successful
Math 125 Calculus and Analytic Geometry II Fall 2010 Instructor Dr. Amites Sarkar
Sarkar, Amites
Math 125 Calculus and Analytic Geometry II Fall 2010 Instructor Dr. Amites Sarkar Text Calculus, in 216 Bond Hall. My phone number is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;Course
Math 224 Multivariable Calculus and Analytic Geometry I Winter 2014 Instructor Amites Sarkar
Sarkar, Amites
Math 224 Multivariable Calculus and Analytic Geometry I Winter 2014 Instructor Amites Sarkar Text is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;Course Objectives The successful student
Math 224 Multivariable Calculus and Analytic Geometry I Spring 2014 Instructor Amites Sarkar
Sarkar, Amites
Math 224 Multivariable Calculus and Analytic Geometry I Spring 2014 Instructor Amites Sarkar Text-mail is amites.sarkar@wwu.edu #12;Course Objectives The successful student will demonstrate: 1. Understanding of
Math 124 Calculus and Analytic Geometry I Fall 2007 Instructor Amites Sarkar
Sarkar, Amites
Math 124 Calculus and Analytic Geometry I Fall 2007 Instructor Amites Sarkar Text Calculus: Single phone number is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;
Math 125 Calculus and Analytic Geometry II Spring 2010 Instructor Amites Sarkar
Sarkar, Amites
Math 125 Calculus and Analytic Geometry II Spring 2010 Instructor Amites Sarkar Text Calculus phone number is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;Course objectives The successful
Math 125 Calculus and Analytic Geometry II Fall 2009 Instructor Amites Sarkar
Sarkar, Amites
Math 125 Calculus and Analytic Geometry II Fall 2009 Instructor Amites Sarkar Text Calculus: Single-mail is amites.sarkar@wwu.edu #12;Course objectives The successful student will demonstrate: 1. Understanding
Math 225 Multivariable Calculus and Analytic Geometry II Spring 2012 Instructor Amites Sarkar
Sarkar, Amites
Math 225 Multivariable Calculus and Analytic Geometry II Spring 2012 Instructor Amites Sarkar Text, in 216 Bond Hall. My phone number is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;Course
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.
Microuidic device reads up to four consecutive base pairs in DNA sequencing-by-synthesis
Quake, Stephen R.
connected through tygon tubing (Cole-Parmer, Vernon Hills, IL) to Lee-valve arrays (Fluidigm Corp., South
Geometry dependence of crack growth resistance curves in thin sheet aluminum alloys
Stricklin, Lance Lee
1988-01-01T23:59:59.000Z
GEOMETRY DEPENDENCE OF CRACK GROWTH RESISTANCE CURVES IN THIN SHEET ALUMINUM ALLOYS A Thesis by LANCE LEE STRICKLIN Submitted to the Office of Graduate Studies of Texas ASM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE December 1988 Major Subject: Mechanical Engineering GEOMETRY DEPENDENCE OF CRACK GROWTH RESISTANCE CURVES IN THIN SHEET ALUMINUM ALLOYS A Thesis by LANCE LEE STRICKLIN Approved as to style and content by: Ted L. Anderson...
acidization: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 7 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acids: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 7 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
Acid Ions are More Than Spectators
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gas-phase studies. The discovery suggests that it is not simply the release of protons - hydrogen ions - that is important for the properties of acids. When a strong acid, such as...
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.
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.
amino acid intake: Topics by E-print Network
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protein intake (PDI) and net portal appearance rate of amino acids by continuous infusion of para-aminohippuric acid via the mesenteric catheter. The amino-acid appearance...
Hydrogen-Bond Acidic Polymers for Chemical Vapor Sensing. | EMSL
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Acidic Polymers for Chemical Vapor Sensing. Hydrogen-Bond Acidic Polymers for Chemical Vapor Sensing. Abstract: A review with 171 references. Hydrogen-bond acidic polymers for...
Reactions Between Water Soluble Organic Acids and Nitrates in...
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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...
acid anew insights: Topics by E-print Network
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is the sequence of amino acids produced, and because amino acids average about Texas at San Antonio, University of 290 Combined Acid Catalysis for Asymmetric Synthesis Chemistry...
acid synthase impacts: Topics by E-print Network
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acid utilization and glucose oxidation. Glucose... Adhikari, Sean 2006-10-30 246 ANTIBODY PURIFICATION USING CAPRYLIC ACID In mildly acidic conditions, the addition of short-chain...
Chemical Additive Selection in Matrix Acidizing
Weidner, Jason 1981-
2011-05-09T23:59:59.000Z
critical detail of weak acid chemistry. One concern when using any acid in oilfield operations is the corrosion of well tubulars. Thus operators often choose to pump corrosion inhibitor, a chemical additive electrostatically attracted... to the negative charge of the well casing or production tubing, to decrease the rate at which the acid accesses well tubular surfaces (Crowe and Minor 1985). A typical working concentration of corrosion inhibitor is 1-2 wt% of injected acid (Smith et al. 1978...
Organic Acid Production by Filamentous Fungi
-being. Indeed, organic acid fermentations are often not even identified as fungal bioprocesses, having been Aspergillus niger in aerated stirred-tank-reactors can convert glucose to citric acid with greater than 80 lipolytica, and related yeast species, may be in use commercially to produce citric acid (Lopez-Garcia, 2002
Unnatural reactive amino acid genetic code additions
Deiters, Alexander (La Jolla, CA); Cropp, T. Ashton (Bethesda, MD); Chin, Jason W. (Cambridge, GB); Anderson, J. Christopher (San Francisco, CA); Schultz, Peter G. (La Jolla, CA)
2011-08-09T23:59:59.000Z
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-tRNAsyn-thetases, 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.
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.
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.
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.
CHAPTER 13. ACID RAIN Acid rain was discovered in the 19th century by Robert Angus
Jacob, Daniel J.
247 CHAPTER 13. ACID RAIN Acid rain was discovered in the 19th century by Robert Angus Smith, a pharmacist from Manchester (England), who measured high levels of acidity in rain falling over industrial decline of fish populations in the lakes of southern Norway and traced the problem to acid rain. Similar
Fate of Acids in Clouds 1. Combination with bases dissolved in clouds: acids neutralized
Schofield, Jeremy
problems. E#11;ects of Acid Rain 1. Vegetation: SO 2 is toxic to plants #15; Leaves damaged below pH 3 rain { Athens and Rome cathedrals and statues: pollution leads to acid rain #15; SteelFate of Acids in Clouds 1. Combination with bases dissolved in clouds: acids neutralized NH 3 (g
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...
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.
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.
acid bacteria isolates: Topics by E-print Network
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acids are solids not liquids. They sublime under vacuum to compare the strengths of solid acids with liquid acids therefore led us to obtain a measure of acidity in dilute...
acid bacteria isolated: Topics by E-print Network
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acids are solids not liquids. They sublime under vacuum to compare the strengths of solid acids with liquid acids therefore led us to obtain a measure of acidity in dilute...
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...
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.
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.
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...
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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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDC documentationBarrow, Alaska Outreach Home RoomPlans OutreachAcid
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.
Final Report for the grant "Applied Geometry" (DOE DE-FG02-04ER25657)
Prof. Mathieu Desbrun
2009-05-20T23:59:59.000Z
The primary purpose of this 3-year DOE-funded research effort, now completed, was to develop consistent, theoretical foundations of computations on discrete geometry, to realize the promise of predictive and scalable management of large geometric datasets as handled routinely in applied sciences. Geometry (be it simple 3D shapes or higher dimensional manifolds) is indeed a central and challenging issue from the modeling and computational perspective in several sciences such as mechanics, biology, molecular dynamics, geophysics, as well as engineering. From digital maps of our world, virtual car crash simulation, predictive animation of carbon nano-tubes, to trajectory design of space missions, knowing how to process and animate digital geometry is key in many cross-disciplinary research areas.
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
The impact of magnetic geometry on wave modes in cylindrical plasmas
Chang, Lei
2015-01-01T23:59:59.000Z
Both space and laboratory plasmas can be associated with static magnetic field, and the field geometry varies from uniform to non-uniform. This thesis investigates the impact of magnetic geometry on wave modes in cylindrical plasmas. The cylindrical configuration is chosen so as to explore this impact in a tractable but experimentally realisable configuration. Three magnetic geometries are considered: uniform, focused and rippled. These studies suggest suppressing drift waves in a uniformly magnetised plasma by increasing the field strength, enhancing the efficiency of helicon wave production of plasma by using a focused magnetic field, and forming a gap eigenmode on a linear plasma device by introducing a local defect to the system's periodicity, which is useful for understanding the gap-mode formation and interaction with energetic particles in fusion plasmas.
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.
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.
Analysis of the Effect of Geometry Generated Turbulence on HCCI Combustion by Multi-Zone Modeling
Aceves, S M; Flowers, D L; Martinez-Frias, J; Espinosa-Loza, F; Christensen, M; Johansson, B; Hessel, R P
2004-12-13T23:59:59.000Z
This paper illustrates the applicability of a sequential fluid mechanics, multi-zone chemical kinetics model to analyze HCCI experimental data for two combustion chamber geometries with different levels of turbulence: a low turbulence disc geometry (flat top piston), and a high turbulence square geometry (piston with a square bowl). The model uses a fluid mechanics code to determine temperature histories in the engine as a function of crank angle. These temperature histories are then fed into a chemical kinetic solver, which determines combustion characteristics for a relatively small number of zones (40). The model makes the assumption that there is no direct linking between turbulence and combustion. The results show that the multi-zone model yields good results for both the disc and the square geometries. The model makes good predictions of pressure traces and heat release rates. The experimental results indicate that the high turbulence square geometry has longer burn duration than the low turbulence disc geometry. This difference can be explained by the sequential multi-zone model, which indicates that the cylinder with the square bowl has a thicker boundary layer that results in a broader temperature distribution. This broader temperature distribution tends to lengthen the combustion, as cold mass within the cylinder takes longer to reach ignition temperature when compressed by the expansion of the first burned gases. The multi-zone model, which makes the basic assumption that HCCI combustion is controlled by chemical kinetics, is therefore capable of explaining the experimental results obtained for different levels of turbulence, without considering a direct interaction between turbulence and combustion. A direct connection between turbulence and HCCI combustion may still exists, but it seems to play a relatively minor role in determining burn duration at the conditions analyzed in this paper.
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.
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 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.
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.
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.
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.
Poole, L.J.
2008-01-01T23:59:59.000Z
production of citric acid by fermentation, recovery of theof Citric Acid from Aqueous Fermentation Solutions byof citric acid was 1.1.1 Lactic Acid Currently, fermentation
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.
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.
acid-dependent ribonucleic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 40 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
acid n-glycolylneuraminic acid: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
by USDA and U of I researchers Illinois at Urbana-Champaign, University of 7 Controlling acid rain MIT - DSpace Summary: High concentrations of sulfuric and nitric acid in raTn fn...
Crawford, C.L. [Westinghouse Savannah River Company, AIKEN, SC (United States); Peterson, R. A.
1997-02-11T23:59:59.000Z
This report documents the copper-catalyzed chemical kinetics of triphenylboron, diphenylborinic acid and phenylboric acid (3PB, 2PB and PBA) in aqueous alkaline solution contained in carbon-steel vessels between 40 and 70 degrees C.
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.
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...
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.
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
Coupled Effects of Mechanics, Geometry, and Chemistry on Bio-membrane Behavior
Winfree, Erik
build and analyze complete models to understand the behavior of multi-component membranes. We proposeCoupled Effects of Mechanics, Geometry, and Chemistry on Bio-membrane Behavior Thesis by Ha Giang, and encouragement. #12;iv Abstract Lipid bilayer membranes are models for cell membranesthe structure that helps
Building Part-based Object Detectors via 3D Geometry Abhinav Shrivastava Abhinav Gupta
Treuille, Adrien
Building Part-based Object Detectors via 3D Geometry Abhinav Shrivastava Abhinav Gupta The Robotics on heuristics such as high gradient energy. This part- based model is trained discriminatively; however, learning this model is a complex task as it involves optimization of a non-convex function over a set
Fedkiw, Ron
High Resolution Sharp Computational Methods for Elliptic and Parabolic Problems in Complex Geometries Frédéric Gibou Chohong Min Ron Fedkiw November 2, 2012 In honor of Stan Osher's 70th birthday of chemical species (see [48] and the references therein); they are also core building blocks in fields
Scale and geometry effects on heat-recirculating combustors Chien-Hua Chen*
Scale and geometry effects on heat-recirculating combustors Chien-Hua Chen* and Paul D. Ronney effects on heat-recirculating combustors A simple analysis of linear and spiral counterflow heat-recirculating combustors was conducted to identify the dimensionless parameters expected to quantify the performance
Helena Berekov, ass. prof. RNDr., PhD. Department of Algebra, Geometry and Didactics of Mathematics
Spagnolo, Filippo
Helena BerekovÃ¡, ass. prof. RNDr., PhD. Department of Algebra, Geometry and Didactics of the Theory of Embodiment, elements of the Theory of Didactical Situations and history. The chapter 1 of some context. The methodology, which the author used, was derived mainly from the Theory of Didactical
Grujicic, Mica
geometry optimization in polymer electrolyte membrane (PEM) fuel cells M. Grujicic, C.L. Zhao, K of the optimal PEM fuel cell design. The results of the optimization analysis show that higher current densities electrolyte membrane (PEM) fuel cells; Design; Optimization; Robustness 1. Introduction Due to their potential
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.
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
Generating and Rendering Four-Dimensional Polytopes John M. Sullivan, Geometry Supercomputer Project
Sullivan, John M.
Generating and Rendering Four-Dimensional Polytopes John M. Sullivan, Geometry Supercomputer, and can be rendered in three dimensions in stereographic projection. In this article we construct one with Mathematica graphics, or with a more sophisticated renderer such as RenderMan. Regular Polytopes and Soap
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
Acoustically driven cavitation cluster collapse in planar geometry Ivan van der Kroon,1
Ohl, Claus-Dieter
the dynamics of arrays of transient cavitation bubbles exposed to a sound field in a planar geometry. Single with a digital hologram and focusing it into a thin gap of liquid. The liquid is driven with an oscillating with high-speed photography with a two-dimensional Rayleigh model. For multibubble configura- tions we
Breakdown characteristics in n&planar geometries and hollow cathode pseudospark switches
Kushner, Mark
's law, whose scaling parameter is pd (gas pressure x electrode separation). In nonplanar geometries, Paschen's law is not directly applicable due to the ambiguity in the distance between the electrodes in helium (0.1 to a few Torr, voltages of tens of kV, effective electrode separation of a few mm
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...
Effect of Nozzle Geometry on Jet Noise Reduction Using Fan Flow Deflectors
Papamoschou, Dimitri
or sideforce p = pressure q = dynamic pressure S = wedge wetted area u = mean velocity in jet plume U = nozzleEffect of Nozzle Geometry on Jet Noise Reduction Using Fan Flow Deflectors Dimitri Papamoschou of baseline nozzle shape on the ability of fan flow deflectors to reduce downward-emitted turbulent mixing
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.
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
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.
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
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
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
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
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
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
Geometry Aware Direction Field Processing Nicolas Ray, Bruno Vallet, Laurent Alonso and Bruno Levy
Frey, Pascal
. Extrapolating and smoothing such fields is usually performed by minimizing an energy composed of a smoothness.7 [Computer Graphics]: Three-Dimensional Graphics and Realism-- Color, shading, shadowing, and texture; I.3.5 [Computer Graphics]: Computational Geometry and Object Mod- eling; G.1.6 [Numerical Analysis]: Optimization
Bone density and geometry in juvenile racehorses fed differing amounts of minerals
Nolan, Meghan Muire
2002-01-01T23:59:59.000Z
designed as low, moderate, moderately high and high. Radiographs of the third metacarpal (MCIII) were taken on day 0, 28, 60, 92 and 124 to evaluate change in bone density and bone geometry. Bone density was expressed as radiographic bone aluminum...
Non-Commutative Geometry in Higher Dimensional Quantum Hall Effect as A-Class Topological Insulator
Kazuki Hasebe
2014-08-04T23:59:59.000Z
We clarify relations between the higher dimensional quantum Hall effect and A-class topological insulator. In particular, we elucidate physical implications of the higher dimensional non-commutative geometry in the context of A-class topological insulator. This presentation is based on arXiv:1403.5066.
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
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
A kinematic wave model for rivers with flood plains and other irregular geometries
Tabak, Esteban G.
A kinematic wave model for rivers with flood plains and other irregular geometries Pablo M. Jacovkis Esteban G. Tabak March 2006 Abstract A general kinematic wave model for flood propagation) This kinematic wave equation, which has been studied by [3], can be derived from the complete system (1, 2) under
solar cells. Using oriented titanium oxide (TiO2 ) nanotube (NT) arrays has shown promise for dye- sensitized solar cells (DSSCs). High solar conversion efficiency requires that the incident light entersSynthetic fabrication strategy optimizes the illumination geometry and transport properties of dye-sensitized
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
Fayer, Michael D.
occur in the water structure and dynamics. At the same time, MD simulations have shown that the mostGeometry and Nanolength Scales versus Interface Interactions: Water Dynamics in AOT Lamellar Structures and Reverse Micelles David E. Moilanen, Emily E. Fenn, Daryl Wong, and M. D. Fayer* Department
Combined effects of prepulsing and target geometry on efficient extreme ultraviolet
Harilal, S. S.
and the deposition of EUV and out of band radiation can fur- ther cause surface erosion and damage at the required targets geometries with special grooves as developed previously by the authors. C 2011 Society of Photo-Optical. Damage of multilayer Mo/Si mirrors by the de- bris products of laser beam interaction with target
Constraints on backstop geometry of the southwest Ryukyu subduction based on reection seismic data
Demouchy, Sylvie
Constraints on backstop geometry of the southwest Ryukyu subduction based on reÂ¯ection seismic data 1999; revised 10 May 2000 Abstract Based on the analysis of 45 seismic reÂ¯ection proÂ®les, the top from the frontal part (southernmost extremity) of the Ryukyu margin. From seismic reÂ¯ection proÂ®les, we
amine-nitro hydrogen-bond geometry: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
amine-nitro hydrogen-bond geometry First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 A new...
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
BNL Citric Acid Technology: Pilot Scale Demonstration
FRANCIS, A J; DODGE,; J, C; GILLOW, J B; FORRESTER, K E
1999-09-24T23:59:59.000Z
The objective of this project is to remove toxic metals such as lead and cadmium from incinerator ash using the Citric Acid Process developed at Brookhaven National Laboratory. In this process toxic metals in bottom ash from the incineration of municipal solid waste were first extracted with citric acid followed by biodegradation of the citric acid-metal extract by the bacterium Pseudomonas fluorescens for metals recovery. The ash contained the following metals: Al, As, Ba, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Se, Sr, Ti, and Zn. Optimization of the Citric Acid Process parameters which included citric acid molarity, contact time, the impact of mixing aggressiveness during extraction and pretreatment showed lead and cadmium removal from incinerator ash of >90%. Seeding the treated ash with P. fluorescens resulted in the removal of residual citric acid and biostabilization of any leachable lead, thus allowing it to pass EPA?s Toxicity Characteristic Leaching Procedure. Biodegradation of the citric acid extract removed >99% of the lead from the extract as well as other metals such as Al, Ca, Cu, Fe, Mg, Mn, Ti, and Zn. Speciation of the bioprecipitated lead by Extended X-ray Absorption Fine Structure at the National Synchrotron Light Source showed that the lead is predominantly associated with the phosphate and carboxyl functional groups in a stable form. Citric acid was completely recovered (>99%) from the extract by sulfide precipitation technique and the extraction efficiency of recovered citric acid is similar to that of the fresh citric acid. Recycling of the citric acid should result in considerable savings in the overall treatment cost. We have shown the potential application of this technology to remove and recover the metal contaminants from incinerator ash as well as from other heavy metal bearing wastes (i.e., electric arc furnace dust from steel industry) or soils. Information developed from this project is being applied to demonstrate the remediation of lead paint contaminated soils on Long Island.
Prasad, Ajay K.
Particle image velocimetry measurements in complex geometries L. M. Hopkins, J. T. Kelly, A. S as $100 per model. Currently, rapid prototyping cannot be directly employed to build PIV-compatible models a technique by which replicate models of arbitrary geometry, suitable for ¯ow diagnostics with PIV, can
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
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
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...
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.
Nanoparticles modified with multiple organic acids
Cook, Ronald Lee (Lakewood, CO); Luebben, Silvia DeVito (Golden, CO); Myers, Andrew William (Arvada, CO); Smith, Bryan Matthew (Boulder, CO); Elliott, Brian John (Superior, CO); Kreutzer, Cory (Brighton, CO); Wilson, Carolina (Arvada, CO); Meiser, Manfred (Aurora, CO)
2007-07-17T23:59:59.000Z
Surface-modified nanoparticles of boehmite, and methods for preparing the same. Aluminum oxyhydroxide nanoparticles are surface modified by reaction with selected amounts of organic acids. In particular, the nanoparticle surface is modified by reactions with two or more different carboxylic acids, at least one of which is an organic carboxylic acid. The product is a surface modified boehmite nanoparticle that has an inorganic aluminum oxyhydroxide core, or part aluminum oxyhydroxide core and a surface-bonded organic shell. Organic carboxylic acids of this invention contain at least one carboxylic acid group and one carbon-hydrogen bond. One embodiment of this invention provides boehmite nanoparticles that have been surface modified with two or more acids one of which additional carries at least one reactive functional group. Another embodiment of this invention provides boehmite nanoparticles that have been surface modified with multiple acids one of which has molecular weight or average molecular weight greater than or equal to 500 Daltons. Yet, another embodiment of this invention provides boehmite nanoparticles that are surface modified with two or more acids one of which is hydrophobic in nature and has solubility in water of less than 15 by weight. The products of the methods of this invention have specific useful properties when used in mixture with liquids, as filler in solids, or as stand-alone entities.
Producing dicarboxylic acids using polyketide synthases
Katz, Leonard; Fortman, Jeffrey L; Keasling, Jay D
2013-10-29T23:59:59.000Z
The present invention provides for a polyketide synthase (PKS) capable of synthesizing a dicarboxylic acid (diacid). Such diacids include diketide-diacids and triketide-diacids. The invention includes recombinant nucleic acid encoding the PKS, and host cells comprising the PKS. The invention also includes methods for producing the diacids.
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...
Surfactant Screening to Alter the Wettability and Aid in Acidizing Carbonate Formations
Yadhalli Shivaprasad, Arun Kumar
2013-02-26T23:59:59.000Z
, known as high temperature organic acids (HTO acids), have been found to be useful in acidizing subterranean formations at temperatures up to 400oF. Some of these acids are oxalic acid, malonic acid, pimelic acid, succinic acid, glutaric acid, adipic... acid and their mixtures. In addition to creating wormholes in carbonate formations, HTO acids can remove carbonate scale at high temperatures and cause very low corrosion to the tubing and casing. 6 1.2 Role of Surfactants in Acidizing 1...
Experimental Study of Acid Fracture Conductivity of Austin Chalk Formation
Nino Penaloza, Andrea
2013-05-01T23:59:59.000Z
to those in actual acid fracture treatments. After acid etching, fracture conductivity is measured at different closure stresses. This research work presents a systematic study to investigate the effect of temperature, rock-acid contact time and initial...
acid-base imbalance: Topics by E-print Network
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acid generates a material (PE-C02H Deutch, John 59 Acid-Based Synthesis of Monodisperse Rare-Earth-Doped Colloidal SiO2 Spheres Materials Science Websites Summary: Acid-Based...
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...
Investigations of amino acid-based surfactants at liquid interfaces
Yang, Dengliang
2005-11-01T23:59:59.000Z
Herein are presented collective studies of amino acid-based surfactants, also known as lipoamino acids, at liquid interfaces. Chapter III describes an investigation of domain morphology of N-Stearoylglutamic acid (N-SGA) ...
aqueous tartaric acid: Topics by E-print Network
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with limited success.2,3 During the last decade, attention to sulfuric acid anodizing and boric-sulfuric acid Paris-Sud XI, Universit de 255 Si isotope systematics of acidic...
Difunctional carboxylic acid anions in oilfield waters
MacGowan, D.B.; Surdam, R.C.
1988-01-01T23:59:59.000Z
Recent models of porosity enhancement during sandstone diagenesis have called upon the metal complexing ability of difunctional carboxylic acid anions in subsurface waters to explain aluminosilicate dissolution. Although carboxylic acid anions have been known to exist in oilfield waters since the turn of the century, until now the existence of significant concentrations of difunctional carboxylic acid anions has not been documented. Data from this study show that difunctional carboxylic acid anions can exist in concentrations up to 2640 ppm, and can account for nearly 100% of the organic acid anions in some oilfield waters. Formation water samples with exceptionally high concentrations of difunctional carboxylic acid anions are found in reservoirs which are at maximum levels of thermal exposure, and which are presently in the 80-100/sup 0/C thermal window. Plagioclase dissolution experiments performed with natural oilfield waters and artificial solutions indicate that waters with high difunctional acid anion concentrations are capable, by organo-metallic complexation, of being apparently oversaturated with respect to total aluminum concentrations compared to the inorganic solubility of kaolinite by several orders of magnitude. Dissolution experiments simulating a specific geologic environment (Stevens Sandstone, southern San Joaquin Basin, California; using natural oilfield waters and Stevens Sandstone core samples), produced plagioclase and calcite dissolution textures similar to those noted in well cores from the Stevens Sandstone, as well as raising total aluminum concentrations in these experimental solutions several orders of magnitude over the solubility of kaolinite.
Production of Succinic Acid for Lignocellulosic Hydrolysates
Davison, B.H.; Nghiem, J.
2002-06-01T23:59:59.000Z
The purpose of this Cooperative Research and Development Agreement (CRADA) is to add and test new metabolic activities to existing microbial catalysts for the production of succinic acid from renewables. In particular, they seek to add to the existing organism the ability to utilize xylose efficiently and simultaneously with glucose in mixtures of sugars or to add succinic acid production to another strain and to test the value of this new capability for production of succinic acid from industrial lignocellulosic hydrolyasates. The Contractors and Participant are hereinafter jointly referred to as the 'Parties'. Research to date in succinic acid fermentation, separation and genetic engineering has resulted in a potentially economical process based on the use of an Escherichia coli strain AFP111 with suitable characteristics for the production of succinic acid from glucose. Economic analysis has shown that higher value commodity chemicals can be economically produced from succinic acid based on repliminary laboratory findings and predicted catalytic parameters. The initial target markets include succinic acid itself, succinate salts, esters and other derivatives for use as deicers, solvents and acidulants. The other commodity products from the succinic acid platform include 1,4-butanediol, {gamma}-butyrolactone, 2-pyrrolidinone and N-methyl pyrrolidinone. Current economic analyses indicate that this platform is competitive with existing petrochemical routes, especially for the succinic acid and derivatives. The report presents the planned CRADA objectives followed by the results. The results section has a combined biocatalysis and fermentation section and a commercialization section. This is a nonproprietary report; additional proprietary information may be made available subject to acceptance of the appropriate proprietary information agreements.
Maccabe, Barney
are traditionally scored based on energy values. A protein-ligand complex selected because Accurate Analysis of Large Datasets of Protein-Ligand Binding Geometries for classifying protein-ligand binding geometries in molecular docking. We analyze results
Srinivasan, Urmila
2010-01-16T23:59:59.000Z
Geometry deals with form, shape, and measurement and is a part of mathematics where visual thought is dominant. Both design and construction in architecture deal with visualization, and architects constantly employ geometry. Today, with the advent...
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...) with solid potassium benzoate (BZAK) and m- or p-substituted potassium benzoates (R'BZAK) have been carried out in sealed thin-walled glass capillary tubes or in 0 sealed weighing bottles at 70 For the reaction, RBZAH + R'BZAK, where R = R', the product...
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.
F. Euchner; S. Jordan; K. Beuermann; B. T. Gaensicke; F. V. Hessmann
2002-05-21T23:59:59.000Z
We have computed optical Zeeman spectra of magnetic white dwarfs for field strengths between 10 and 200MG and effective temperatures between 8000 and 40000K. They form a database containing 20628 sets of flux and circular polarization spectra. A least-squares optimization code based on an evolutionary strategy can recover relatively complex magnetic field topologies from phase-resolved synthetic Zeeman spectra of rotating magnetic white dwarfs. We consider dipole and quadrupole components which are non-aligned and shifted off-centre. The model geometries include stars with a single high-field spot and with two spots separated by approx. 90 degrees. The accuracy of the recovered field structure increases with the signal-to-noise ratio of the input spectra and is significantly improved if circular polarization spectra are included in addition to flux spectra. We discuss the strategies proposed so far to unravel the field geometries of magnetic white dwarfs.
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.
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)].
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...
The Non-Commutative Geometry of the Complex Classes of Topological Insulators
Emil Prodan
2014-06-13T23:59:59.000Z
Alain Connes' Non-Commutative Geometry program [Connes 1994] has been recently carried out [Prodan, Leung, Bellissard 2013, Prodan, Schulz-Baldes 2014] for the entire A- and AIII-symmetry classes of topological insulators, in the regime of strong disorder where the insulating gap is completely filled with dense localized spectrum. This is a short overview of these results, whose goal is to highlight the methods of Non-Commutative Geometry involved in these studies. The exposition proceeds gradually through the cyclic cohomology, quantized calculus with Fredholm-modules, local formulas for the odd and even Chern characters and index theorems for the odd and even Chern numbers. The characterization of the A- and AIII-symmetry classes in the presence of strong disorder and magnetic fields emerges as a natural application of these tools.
Spencer, B.W.; Vetter, D.; Wesel, R.; Sienicki, J.J.
1983-01-01T23:59:59.000Z
One of the key issues in assessment of the meltout phase of a hypothetical core disruptive accident in the LMFBR system involves the timing and paths for dispersal of molten fuel from the disrupted core. A program of experiments is underway at Argonne National Laboratory to investigate molten fuel penetration through these postulated escape paths. The purpose of the GAP-4 test was to examine the penetration distances of molten fuel flowing through the flat, narrow channels representing the intersubassembly gap geometry. In the experiment design, the gap geometry was selected to be two-dimensional on the basis that the gap volume in a reactor design would be interconnected and continuous. The molten fuel used in these tests was a mixture of UO/sub 2/ (81%) and molybdenum (19%) which was generated by an exothermic thermite reaction at a temperature of approx. 3470 K.
'AdS_5' Geometry Beyond Space-time and 4D Noncommutative Space-time
Otto C. W. Kong
2009-06-19T23:59:59.000Z
We discuss a 4D noncommutative space-time as suggested by the version of quantum (deformed) relativity which provides a classical geometry picture as an `AdS_5'. The 4D noncommutative space-time is more like a part of a phase space description, in accordance with the quantum notion -- quantum mechanics talks about only states but not configurations. The `AdS_5' picture also illustrates the classical 4D space-time is to be described as part of a bigger geometry beyond space-time at the quantum level. The radically new picture of quantum 'space-time' is expected to provide the basis for a (still to be formulated) new approach to quantum gravity with fundamental constants (quantum) hbar and Newton's constant G put at a similar level as c, the speed of light.
Simulating higher-dimensional geometries in GADRAS using approximate one-dimensional solutions.
Thoreson, Gregory G.; Mitchell, Dean James; Harding, Lee T.
2013-02-01T23:59:59.000Z
The Gamma Detector Response and Analysis Software (GADRAS) software package is capable of simulating the radiation transport physics for one-dimensional models. Spherical shells are naturally one-dimensional, and have been the focus of development and benchmarking. However, some objects are not spherical in shape, such as cylinders and boxes. These are not one-dimensional. Simulating the radiation transport in two or three dimensions is unattractive because of the extra computation time required. To maintain computational efficiency, higher-dimensional geometries require approximations to simulate them in one-dimension. This report summarizes the theory behind these approximations, tests the theory against other simulations, and compares the results to experimental data. Based on the results, it is recommended that GADRAS users always attempt to approximate reality using spherical shells. However, if fissile material is present, it is imperative that the shape of the one-dimensional model matches the fissile material, including the use of slab and cylinder geometry.
Capacitative coupling of singlet-triplet qubits in different inter-qubit geometries
Tuukka Hiltunen; Ari Harju
2014-04-22T23:59:59.000Z
In the singlet-triplet qubit architecture, the two-qubit interactions required in universal quantum computing can be implemented by capacitative coupling, by exploiting the charge distribution differences of the singlet and triplet states. The efficiency of this scheme is limited by decoherence, that can be mitigated by stronger coupling between the qubits. In this paper, we study the capacitative coupling of singlet-triplet qubits in different geometries of the two-qubit system. The effects of the qubit-qubit distance and the relative orientation of the qubits on the capacitative coupling strength are discussed using an accurate microscopic model and exact diagonalization of it. We find that the trapezoidal quantum dot formations allow strong coupling with low charge distribution differences between the singlet and triplet states. The analysis of geometry on the capacitative coupling is also extended to the many-qubit case and the creation of cluster states.
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.
aspartic acid racemization: Topics by E-print Network
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rate of racemization for amino acids preserved in planktonic foraminifera climate change. Keywords: amino acid racemization, Quaternary geochronology, Arctic Ocean, planktonic...
Catalytic Consequences of Acid Strength in the Conversion of...
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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:...
acid bacteria revisited: Topics by E-print Network
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Summary: The Fate of Amino Acid in Soil Experiments: Bacteria, Roots and Fungi Melissa Campbell Clark of amino acid in soil using radioactive isotopes, however many experiments...
acid bacteria elicit: Topics by E-print Network
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Summary: The Fate of Amino Acid in Soil Experiments: Bacteria, Roots and Fungi Melissa Campbell Clark of amino acid in soil using radioactive isotopes, however many experiments...
acid bacteria affect: Topics by E-print Network
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Summary: The Fate of Amino Acid in Soil Experiments: Bacteria, Roots and Fungi Melissa Campbell Clark of amino acid in soil using radioactive isotopes, however many experiments...
acid bacteria structure: Topics by E-print Network
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Summary: The Fate of Amino Acid in Soil Experiments: Bacteria, Roots and Fungi Melissa Campbell Clark of amino acid in soil using radioactive isotopes, however many experiments...
acid bacteria inducing: Topics by E-print Network
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Summary: The Fate of Amino Acid in Soil Experiments: Bacteria, Roots and Fungi Melissa Campbell Clark of amino acid in soil using radioactive isotopes, however many experiments...
acid bacteria purification: Topics by E-print Network
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Summary: The Fate of Amino Acid in Soil Experiments: Bacteria, Roots and Fungi Melissa Campbell Clark of amino acid in soil using radioactive isotopes, however many experiments...
acid bacteria enhance: Topics by E-print Network
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de 4 The Fate of Amino Acid in Soil Experiments: Bacteria, Roots and Fungi Melissa Campbell Environmental Sciences and Ecology Websites Summary: The Fate of Amino Acid in...
acid conserved neutralizing: Topics by E-print Network
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Websites Summary: itself against acidification and is used to monitor the effect of acid rain on watersheds. From 1993MASTERS REPORT ANALYSIS AND MODELING OF ACID...
acid biosynthesis revealed: Topics by E-print Network
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Websites Summary: bioavailability of aluminum triggered by in- dustrialization and acid rain 20. The presence of organic acidsThe Metabolism of Aluminum Citrate and...
acid biosynthesis inhibitors: Topics by E-print Network
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Websites Summary: bioavailability of aluminum triggered by in- dustrialization and acid rain 20. The presence of organic acidsThe Metabolism of Aluminum Citrate and...
abscisic acid biosynthesis: Topics by E-print Network
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Websites Summary: bioavailability of aluminum triggered by in- dustrialization and acid rain 20. The presence of organic acidsThe Metabolism of Aluminum Citrate and...
acid neutralization capacity: Topics by E-print Network
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Websites Summary: itself against acidification and is used to monitor the effect of acid rain on watersheds. From 1993MASTERS REPORT ANALYSIS AND MODELING OF ACID...
acid neutralizing capacity: Topics by E-print Network
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Websites Summary: itself against acidification and is used to monitor the effect of acid rain on watersheds. From 1993MASTERS REPORT ANALYSIS AND MODELING OF ACID...
acid levels metabolic: Topics by E-print Network
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Websites Summary: bioavailability of aluminum triggered by in- dustrialization and acid rain 20. The presence of organic acidsThe Metabolism of Aluminum Citrate and...
acid function biosynthesis: Topics by E-print Network
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Websites Summary: bioavailability of aluminum triggered by in- dustrialization and acid rain 20. The presence of organic acidsThe Metabolism of Aluminum Citrate and...
acid biosynthesis leads: Topics by E-print Network
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Websites Summary: bioavailability of aluminum triggered by in- dustrialization and acid rain 20. The presence of organic acidsThe Metabolism of Aluminum Citrate and...
acid soil tolerance: Topics by E-print Network
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Energy Websites Summary: 1980; however, soils collected during the earlier phases of acid rain research have led to a growing Indications of Soil Recovery from Acidic...
acid biosynthesis synthesis: Topics by E-print Network
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Websites Summary: bioavailability of aluminum triggered by in- dustrialization and acid rain 20. The presence of organic acidsThe Metabolism of Aluminum Citrate and...
acid biosynthesis genes: Topics by E-print Network
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Websites Summary: bioavailability of aluminum triggered by in- dustrialization and acid rain 20. The presence of organic acidsThe Metabolism of Aluminum Citrate and...
Hydrogen-bond acidic functionalized carbon nanotubes (CNTs) with...
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Hydrogen-bond acidic functionalized carbon nanotubes (CNTs) with covalently-bound hexafluoroisopropanol groups. Hydrogen-bond acidic functionalized carbon nanotubes (CNTs) with...
Effects of Continuous Triiodothyronine Infusion on Citric Acid...
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Continuous Triiodothyronine Infusion on Citric Acid Cycle in the Normal Immature Swine Heart under Extracorporeal Effects of Continuous Triiodothyronine Infusion on Citric Acid...
Copper isotope fractionation in acid mine drainage. | EMSL
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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...
AVTA: 2010 Honda Civic HEV with Experimental Ultra Lead Acid...
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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...
acid adenine dinucleotide: Topics by E-print Network
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Theoretical Determination of One-Electron Oxidation Potentials for Nucleic Acid Bases Brian T potentials for N-methyl substituted nucleic acid bases guanine, adenine, cytosine,...
Acid Initiation of Ammonia-Borane Dehydrogenation for Hydrogen...
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Acid Initiation of Ammonia-Borane Dehydrogenation for Hydrogen Storage. Acid Initiation of Ammonia-Borane Dehydrogenation for Hydrogen Storage. Abstract: An abstract for this...
Electrodeposition From Acidic Solutions of Nickel Bis(benzenedithiolat...
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From Acidic Solutions of Nickel Bis(benzenedithiolate) Produces a Hydrogen-Evolving Ni-S Film on Glassy Carbon Electrodeposition From Acidic Solutions of Nickel...
Lewis Acid-Base Interactions between Polysulfides and Metal Organic...
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Lewis Acid-Base Interactions between Polysulfides and Metal Organic Framework in Lithium Sulfur Batteries. Lewis Acid-Base Interactions between Polysulfides and Metal Organic...