cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Microscopic derivation of Vlasov equations with singular potentials
Creators: name: Grass, Phillip
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35Q83

description: The Vlasov-Poisson equation is a classical example of an effective equation which shall describe the coarse-grained time evolution of a system consisting of a large number of particles which interact by Coulomb or Newton's gravitational force. Although major progress concerning a rigorous justification of such an approach was made recently, there are still substantial steps necessary to obtain a completely convincing result. The main goal of this work is to yield further progress in this regard. \\ To this end, we consider on the one hand $N$-dependent forces $f^N$ (where $N$ shall denote the particle number) which converge pointwise to Coulomb or alternatively Newton`s gravitational force. More precisely, the interaction fulfills $f^N(q)=\pm\frac{q}{|q|^3}$ for $|q|>N^{-\frac{7}{18}+ε}$ and has a cut-off at $|q|= N^{-\frac{7}{18}+ε}$ where $ε>0$ can be chosen arbitrarily small. We prove that under certain assumptions on the initial density $k_0$ the characteristics of Vlasov equation provide typically a very good approximation of the $N$-particle trajectories if their initial positions are i.i.d. with respect to density $k_0$. Interestingly, the cut-off diameter is of smaller order than the average distance of a particle to its nearest neighbor. Nevertheless, the cut-off is essential for the success of the applied approach and thus we consider additionally less singular forces scaling like $|f(q)|=\frac{1}{|q|^α}$ where $α\in (1,\frac{4}{3}]$. In this case we are able to show a corresponding result even without any regularization. Although such forces are distinctly less interesting than for instance Coulomb interaction from a physical perspective, the introduced ideas for dealing with forces where even the related potential is singular might still be helpful for attaining comparable results for the arguably most interesting case $α=2$.
description: PhD Thesis (LMU M\"unchen), advisor: Prof. Peter Pickl; 160 pages, LaTex
On the all-order epsilon-expansion of generalized hypergeometric functions with integer values of parameters
Creators: name: Kalmykov, M. Yu.
name: Ward, B. F. L.
name: Yost, S. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We continue our study of the construction of analytical coefficients of the epsilon-expansion of hypergeometric functions and their connection with Feynman diagrams. In this paper, we apply the approach of obtaining iteratated solutions to the differential equations associated with hypergeometric functions to prove the following result (Theorem 1): The epsilon-expansion of a generalized hypergeometric function with integer values of parameters is expressible in terms of generalized polylogarithms with coefficients that are ratios of polynomials. The method used in this proof provides an efficient algorithm for calculatiing of the higher-order coefficients of Laurent expansion.
description: 12 pages, Latex + amsmath, JHEP3 class packages. This revision adds references 1 and 19. The FORM code is available via the WWW at http://theor.jinr.ru/~kalmykov/hypergeom/hyper.html
Intersection of subgroups in free groups and homotopy groups
Creators: name: Baues, Hans-Joachim
name: Mikhailov, Roman
Publisher: name: arXiv
Year: 2008
Subjects: subject: Group Theory (math.GR)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We show that the intersection of three subgroups in a free group is related to the computation of the third homotopy group $π_3$. This generalizes a result of Gutierrez-Ratcliffe who relate the intersection of two subgroups with the computation of $π_2$. Let $K$ be a two-dimensional CW-complex with subcomplexes $K_1,K_2,K_3$ such that $K=K_1\cup K_2\cup K_3$ and $K_1\cap K_2\cap K_3$ is the 1-skeleton $K^1$ of $K$. We construct a natural homomorphism of $π_1(K)$-modules $$ π_3(K)\to \frac{R_1\cap R_2\cap R_3}{[R_1,R_2\cap R_3][R_2,R_3\cap R_1][R_3,R_1\cap R_2]}, $$ where $R_i=ker\{π_1(K^1)\to π_1(K_i)\}, i=1,2,3$ and the action of $π_1(K)=F/R_1R_2R_3$ on the right hand abelian group is defined via conjugation in $F$. In certain cases, the defined map is an isomorphism. Finally, we discuss certain applications of the above map to group homology.
Dislocation-Mediated Melting in Superfluid Vortex Lattices
Creators: name: Gifford, S. Andrew
name: Baym, Gordon
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We describe thermal melting of the two-dimensional vortex lattice in a rotating superfluid by generalizing the Halperin and Nelson theory of dislocation-mediated melting. and derive a melting temperature proportional to the renormalized shear modulus of the vortex lattice. The rigid-body rotation of the superfluid attenuates the effects of lattice compression on the energy of dislocations and hence the melting temperature, while not affecting the shearing. Finally, we discuss dislocations and thermal melting in inhomogeneous rapidly rotating Bose-Einstein condensates; we delineate a phase diagram in the temperature -- rotation rate plane, and infer that the thermal melting temperature should lie below the Bose-Einstein transition temperature.
description: 9 pages, 2 figures
Carabinae Latreille 1802
Creators: name: Larochelle
name: Larivière, Marie-Claude
name: Larochelle
name: Larivière
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae

description: Subfamily Carabinae   Remark. Carabus (Archicarabus) nemoralis Müller, 1764 was deleted from the New Zealand fauna by Larochelle and Larivière (2013: 35).
description: Published as part of Larochelle, Larivière, Marie-Claude, Larochelle & Larivière, 2016, Taxonomic Supplement (2001 to 2015) to the Catalogue of New Zealand Carabidae (Insecta: Coleoptera), pp. 1-53 in Insecta Mundi 2016 (502) on page 5, DOI: 10.5281/zenodo.5170780
Homotopy types of reduced 2-nilpotent simplicial groups
Creators: name: Baues, Hans-Joachim
name: Mikhailov, Roman
Publisher: name: arXiv
Year: 2008
Subjects: subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics

description: We classify the homotopy types of reduced 2-nilpotent simplicial groups in terms of the homology an d boundary invariants $b,β$. This contains as special cases results of J.H.C. Whitehead on 1-connected 4-dimensional complexes and of Quillen on reduced 2-nilpotent rational simplicial groups. Moreover it yields for 1-nilpotent (or abelian) simplicial groups a classification due to Dold-Kan. Our result describes a new natural structure of the integral homology of any simply connected space. We also classify the homotopy types of connective spectra in the category of 2-nilpotent simplicial groups. Moreover we compute homotopy groups of spheres in the category of $m$-nilpotent groups for $m=2,3$ and partially for $m=4,5$.
Inhibition of Pseudomonas aeruginosa biofilm formation in chronic wounds via elevating intracellular NO level
Creators: name: Tan, Xiaojuan
Publisher: name: Zenodo
Year: 2021

description: This supplementary materials is useful for the manuscript entitled "Inhibition of Pseudomonas aeruginosa biofilm formation in chronic wounds via elevating intracellular NO level".
光子的歧途
Creators: name: Langlang Xu
Publisher: name: figshare
Year: 2021
Subjects: subject: 20501 Classical and Physical Optics
subject: FOS: Physical sciences
subject: 20502 Lasers and Quantum Electronics
subject: 20504 Photonics, Optoelectronics and Optical Communications
subject: Quantum Mechanics
subject: 20604 Quantum Optics
subject: 20603 Quantum Information, Computation and Communication

description: 与其说光的性质由观察手段来决定，不如说观测手段的不完备，导致不能同时观测到两种属性。当然，仅仅是这么说不够有说服力，本文最后会提出一种新的观测方式，可同时检测到两种属性。在实验之前，我们先要把问题的症结“波-粒二象性”这个问题解决。
Poloidal-toroidal decomposition in a finite cylinder. II. Discretization, regularization and validation
Creators: name: Boronski, Piotr
name: Tuckerman, Laurette S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The Navier-Stokes equations in a finite cylinder are written in terms of poloidal and toroidal potentials in order to impose incompressibility. Regularity of the solutions is ensured in several ways: First, the potentials are represented using a spectral basis which is analytic at the cylindrical axis. Second, the non-physical discontinuous boundary conditions at the cylindrical corners are smoothed using a polynomial approximation to a steep exponential profile. Third, the nonlinear term is evaluated in such a way as to eliminate singularities. The resulting pseudo-spectral code is tested using exact polynomial solutions and the spectral convergence of the coefficients is demonstrated. Our solutions are shown to agree with exact polynomial solutions and with previous axisymmetric calculations of vortex breakdown and of nonaxisymmetric calculations of onset of helical spirals. Parallelization by azimuthal wavenumber is shown to be highly effective.
Mecodema angustulum Broun 1914
Creators: name: Larochelle
name: Larivière, Marie-Claude
name: Larochelle
name: Larivière
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Mecodema
Mecodema angustulum

description: Mecodema angustulum Broun, 1914 – Endemic [p. 47]
  Mecodema aoteanoho Seldon and Leschen, 2011  – Endemic
 Mecodema aoteanoho Seldon and Leschen, 2011: 23. Type locality: Great Barrier Island, Whangaparapara Track, CL.
description: Published as part of Larochelle, Larivière, Marie-Claude, Larochelle & Larivière, 2016, Taxonomic Supplement (2001 to 2015) to the Catalogue of New Zealand Carabidae (Insecta: Coleoptera), pp. 1-53 in Insecta Mundi 2016 (502) on page 9, DOI: 10.5281/zenodo.5170780
Cooperative Beamforming for Wireless Ad Hoc Networks
Creators: name: Dong, Lun
name: Petropulu, Athina P.
name: Poor, H. Vincent
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Via collaborative beamforming, nodes in a wireless network are able to transmit a common message over long distances in an energy efficient fashion. However, the process of making available the same message to all collaborating nodes introduces delays. In this paper, a MAC-PHY cross-layer scheme is proposed that enables collaborative beamforming at significantly reduced collaboration overhead. It consists of two phases. In the first phase, nodes transmit locally in a random access time-slotted fashion. Simultaneous transmissions from multiple source nodes are viewed as linear mixtures of all transmitted packets. In the second phase, a set of collaborating nodes, acting as a distributed antenna system, beamform the received analog waveform to one or more faraway destinations. This step requires multiplication of the received analog waveform by a complex weight, which is independently computed by each cooperating node, and which allows packets bound to the same destination to add coherently at the destination node. Assuming that each node has access to location information, the proposed scheme can achieve high throughput, which in certain cases exceeds one. An analysis of the symbol error probability corresponding to the proposed scheme is provided.
description: 5 pages, 4 figures. To appear in the Proceedings of the IEEE Global Communications Conference (GLOBECOM), Washington, DC, November 26 - 30, 2007
Crystallographic studies related to the solid state photochemistry of [alpha]-cycloalkylacetophenones
Creators: name: Evans, Stephen Vincent Ashley
Publisher: name: University of British Columbia
Year: 2012

description: The crystal and molecular structures of fifteen α-cycloalkylacetophenones and propiophenones have been determined with the use of X-ray crystallography. All of the compounds are known to undergo the Norrish type II reaction in the solid state, which involves abstraction of a favourably oriented Ƴ-hydrogen atom to yield a biradical which can undergo either cleavage or cyclization. The compounds were studied to examine the effect of variation in aromatic ring substituents and cycloalkyl ring size on the nature and surroundings of the reaction site, and, if possible, to develop structure-reactivity relationships for reactions in the solid state. Almost all of the acetophenone derivatives with simple cycloalkyl rings studied assume a common conformation in the solid state, with the acetophenone moiety occupying an equatorial position on the cycloalkyl ring, and with the Ƴ-hydrogen atom most likely to be abstracted utilizing a boatlike abstraction geometry. The effect of α-methyl substitution of the α-cycloalkylacetophenones (to produce the corresponding propiophenones) is to rotate the cycloalkyl moiety by approximately 100° about the acyl-carbon α-carbon bond. The conformations of the cycloalkyl rings are in accord with those expected. The cycloheptyl rings assume twist-chairs (though somewhat disordered), while the cyclooctyl ring all display boat-chair conformations. Four α-adamantylacetophenones assume similar conformations in the solid state (with chair like abstraction geometries), but small differences in conformation were found to account for large differences in photochemical behaviour. Structural studies of a 3-methyladamantyl derivative yielded information as to the preferred pathways for cyclobutanol formation in the solid state, and provided an opportunity for producing an optically active product mixture from an achiral starting.
Migration of Star Clusters and Nuclear Rings
Creators: name: van de Ven, Glenn
name: Chang, Philip
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Star clusters that form in nuclear rings appear to be at slightly larger radii than the gas. We argue that the star clusters move out from the gas in which they are formed because of satellite-disk tidal interactions. In calculating the dynamics of this star cluster and gas ring system, we include the effects of dynamical friction of the background stars in the host galaxy on the star cluster, and inflowing gas along the bar onto the nuclear ring at the two contact points. We show that the final separation is of the order of the Hill radius of the nuclear ring, which is typically 20-30% of its radius. Massive star clusters can reach half of this separation very quickly and produce a factor of a few enhancement in the gas surface density. If this leads to star formation in addition to the (ongoing) formation of star clusters near the contact points, a possible (initial) azimuthal age gradient may become diluted or even disappear. Finally, if the star cluster are massive and/or numerous enough, we expect the nuclear ring to migrate inward, away from the (possibly) associated (inner) Lindblad resonance. We discuss how these predictions may be tested observationally.
description: 12 pages, 6 figures, referee comments incorporated; published in ApJ, 2009, 697, 619
Inelastic torsional seismic analysis of frame buildings
Creators: name: Canisius, Tantirimudalige Don Gerard
Publisher: name: University of British Columbia
Year: 2010

description: In the response of three dimensional frame structures to seismic loading, it has been observed that columns common to intersecting frames are especially prone to damage. This presumably results from the combination of forces from the frames; the axial loads are additive, but the moments interact biaxially. Two procedures for analysis of three dimensional frames are studied: time step analysis under given seismic records, using the programme DRAINTABS; and a pseudo-nonlinear modal analysis based on the substitute structure method of Shibata and Sozen, using the programme PITSA. Both these programmes are extended to include biaxial response, which they had not previously done. The evaluation of damage in the two programmes was felt to be unsatisfactory, and procedures are developed to estimate the curvature ductility demand in each case, which is considered to be the basic indicator of potential damage. PITSA is based upon a "substitute damping ratio" which is intended to represent the loss of energy due to hysteresis. The relationship of this factor to the shape of the hysteresis loop is studied. It was hoped that the two programmes, which are aimed at different classes of problems, would nevertheless provide mutual confirmation. Unfortunately, the detailed assumptions are sufficiently different to prevent close agreement, and only general trends are confirmed. Thus it may be concluded that further work on this topic is needed.
Mecodema bullatum Lewis 1902
Creators: name: Larochelle
name: Larivière, Marie-Claude
name: Larochelle
name: Larivière
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Mecodema
Mecodema bullatum

description: Mecodema bullatum Lewis, 1902 – Endemic [p. 49]
  Mecodema chaiup Seldon, 2014  – Endemic
 Mecodema chaiup Seldon, 2014: 30. Type locality: Mohi Bush Scenic Reserve, HB.
description: Published as part of Larochelle, Larivière, Marie-Claude, Larochelle & Larivière, 2016, Taxonomic Supplement (2001 to 2015) to the Catalogue of New Zealand Carabidae (Insecta: Coleoptera), pp. 1-53 in Insecta Mundi 2016 (502) on page 9, DOI: 10.5281/zenodo.5170780
Strategic Initiatives of OBOR over Sri Lankan Education Sector.pdf
Creators: name: Dhanusha Somawardhana
name: S.D.N. Dharmarathna
Publisher: name: figshare
Year: 2021
Subjects: subject: 140210 International Economics and International Finance
subject: FOS: Economics and business

description: Sri Lanka and China relationship has further developed after Sri Lankan independence in 1948. The international relationship between China and Sri Lanka had grow based on five main principles that include peaceful co-existence, sustainable development, equality, friendship and mutual benefits. In January 1950, Sri Lanka admitted the new China. In 1952, the both parties opened a new chapter in bilateral economic and trade relationship with the signing of Sino-Lanka Rubber-Rice Agreement. In 1957, the two sides formally established the diplomatic relationship that opened new era in Sri Lankan Chinese relationship
Decomposition theorems and kernel theorems for a class of functional spaces
Creators: name: Soloviev, Michael A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Functional Analysis (math.FA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 46F15, 46M40, 46N50

description: We prove new theorems about properties of generalized functions defined on Gelfand-Shilov spaces $S^β$ with $0\leβ<1$. For each open cone $U\subset\mathbb R^d$ we define a space $S^β(U)$ which is related to $S^β(\mathbb R^d)$ and consists of entire analytic functions rapidly decreasing inside U and having order of growth $\le 1/(1-β)$ outside the cone. Such sheaves of spaces arise naturally in nonlocal quantum field theory, and this motivates our investigation. We prove that the spaces $S^β(U)$ are complete and nuclear and establish a decomposition theorem which implies that every continuous functional defined on $S^β(\mathbb R^d)$ has a unique minimal closed carrier cone in $\mathbb R^d$. We also prove kernel theorems for spaces over open and closed cones and elucidate the relation between the carrier cones of multilinear forms and those of the generalized functions determined by these forms.
description: AMS-LaTeX, 22 pages, no figures
title: C. S. Lewis and the neurotic imagination : a Horneyan analysis
Creators: name: Vaughan, Simon
Publisher: name: University of St Andrews
Year: 2020

description: Standard accounts of C. S. Lewis’s life and work have typically struggled to explain the complexity of the data and its apparent contradictions, and reduce his conversion to an inscrutable metaphysical event of unquestioned validity. Such treatments of Lewis are often constrained by the shared evangelical intent of the scholars concerned. This thesis argues, sympathetically but critically, that sense can more easily be made of Lewis’s life and work in general, and of his conversion and poetry in particular, if they are understood as the outworking of a dynamic psychological process, one bound up with his failure in early manhood to achieve success (in terms of either recognition or creative potency) as a poet. It argues further that after his conversion his creativity was hampered by the metaphysical constraints he placed on it, which were themselves partly an expression of neurotic demands he made on himself as a consequence of the earlier failure. In giving such an account, the thesis avoids the pitfalls of a Freudian analysis (the only kind to which Lewis has so far been subjected). Instead, the methodology used draws on the psychoanalytical theories of Karen Horney as applied within a broader humanist framework. Horney’s theory posits the imaginative creation in the neurotic person’s mind of an idealized self as a substitute for the real self, which is despised (Chapter 2). The idealized self must then be defended from the incursions of reality by the adoption of various defensive postures (Chapters 3 and 4). These postures, however, offer only partial solutions to the neurotic conflict and are inherently unstable, providing a spurious sense of integration (Chapter 5), as evidenced by the shifting from one solution to another in moments of crisis. Lewis is shown both to have undergone this self-idealization and, to some degree, to have intuited it, without extricating himself entirely from the process (Chapter 6).
Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: a pioneering process of community-focused experimental design
Creators: name: Bianco, Federica B.
name: Ivezić, Željko
name: Jones, R. Lynne
name: Graham, Melissa L.
name: Marshall, Phil
name: Saha, Abhijit
name: Strauss, Michael A.
name: Yoachim, Peter
name: Ribeiro, Tiago
name: Anguita, Timo
name: Bauer, Franz E.
name: Bellm, Eric C.
name: Blum, Robert D.
name: Brandt, William N.
name: Brough, Sarah
name: Catelan, Màrcio
name: Clarkson, William I.
name: Connolly, Andrew J.
name: Gawiser, Eric
name: Gizis, John
name: Hlozek, Renee
name: Kaviraj, Sugata
name: Liu, Charles T.
name: Lochner, Michelle
name: Mahabal, Ashish A.
name: Mandelbaum, Rachel
name: McGehee, Peregrine
name: Neilsen, Eric H.
name: Olsen, Knut A. G.
name: Peiris, Hiranya
name: Rhodes, Jason
name: Richards, Gordon T.
name: Ridgway, Stephen
name: Schwamb, Megan E.
name: Scolnic, Dan
name: Shemmer, Ohad
name: Slater, Colin T.
name: Slosar, Anže
name: Smartt, Stephen J.
name: Strader, Jay
name: Street, Rachel
name: Trilling, David E.
name: Verma, Aprajita
name: Vivas, A. K.
name: Wechsler, Risa H.
name: Willman, Beth
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Vera C. Rubin Observatory is a ground-based astronomical facility under construction, a joint project of the National Science Foundation and the U.S. Department of Energy, designed to conduct a multi-purpose 10-year optical survey of the southern hemisphere sky: the Legacy Survey of Space and Time. Significant flexibility in survey strategy remains within the constraints imposed by the core science goals of probing dark energy and dark matter, cataloging the Solar System, exploring the transient optical sky, and mapping the Milky Way. The survey's massive data throughput will be transformational for many other astrophysics domains and Rubin's data access policy sets the stage for a huge potential users' community. To ensure that the survey science potential is maximized while serving as broad a community as possible, Rubin Observatory has involved the scientific community at large in the process of setting and refining the details of the observing strategy. The motivation, history, and decision-making process of this strategy optimization are detailed in this paper, giving context to the science-driven proposals and recommendations for the survey strategy included in this Focus Issue.
description: Submitted as the opening paper of the Astrophysical Journal Focus Issue on Rubin LSST cadence and survey strategy
Mecodema lucidum Laporte de Castelnau 1867
Creators: name: Larochelle
name: Larivière, Marie-Claude
name: Larochelle
name: Larivière
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Mecodema
Mecodema lucidum

description: Mecodema lucidum Laporte de Castelnau, 1867 – Endemic [p. 57]
  Mecodema manaia Seldon and Leschen, 2011  – Endemic
 Mecodema manaia Seldon and Leschen, 2011: 30. Type locality: Whangarei Heads, Mount Lyon, ND.
description: Published as part of Larochelle, Larivière, Marie-Claude, Larochelle & Larivière, 2016, Taxonomic Supplement (2001 to 2015) to the Catalogue of New Zealand Carabidae (Insecta: Coleoptera), pp. 1-53 in Insecta Mundi 2016 (502) on page 11, DOI: 10.5281/zenodo.5170780
Lyapunov modes in three-dimensional Lennard-Jones fluids
Creators: name: Romero-Bastida, M.
name: Braun, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Recent studies on the phase-space dynamics of a one-dimensional Lennard-Jones fluid reveal the existence of regular collective perturbations associated with the smallest positive Lyapunov exponents of the system, called hydrodynamic Lyapunov modes, which previously could only be identified in hard-core fluids. In this work we present a systematic study of the Lyapunov exponents and Lyapunov vectors, i.e. perturbations along each direction of phase space, of a three-dimensional Lennard-Jones fluid. By performing the Fourier transform of the spatial density of the coordinate part of the Lyapunov vector components and then time-averaging this result we find convincing signatures of longitudinal modes, with inconclusive evidence of transverse modes for all studied densities. Furthermore, the longitudinal modes can be more clearly identified for the higher density values. Thus, according to our results, the mixing of modes induced both by the dynamics and the dimensionality induce a hitherto unknown type of order in the tangent space of the model herein studied at high density values.
description: 28 Pages, 13 b&w Figures
A generalized photon propagator
Creators: name: Itin, Yakov
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A covariant gauge independent derivation of the generalized dispersion relation of electromagnetic waves in a medium with local and linear constitutive law is presented. A generalized photon propagator is derived. For Maxwell constitutive tensor, the standard light cone structure and the standard Feynman propagator are reinstated.
Cloning and characterization of stearoylACP desaturase gene (SAD) in oil palm (Elaeis guineensis Jacq.)
Creators: name: Varinthip Krutkaew
name: Thanakorn Srirat
name: Somvong Tragoonrung
name: Apichart Vanavichit
name: Chatchawan Jantasuriyarat
Publisher: name: Genetics Society of Thailand
Year: 2013
Subjects: oil palm, fatty acid, SAD (Steary-ACP desaturase)

description: 1, 6, Thai Journal of Genetics
Critical phenomena of the layered ferrimagnet Mn3Si2Te6 following proton irradiation
Creators: name: Olmos, Rubyann
name: Delgado, Jose A.
name: Iturriaga, Hector
name: Martinez, Luis M.
name: Saiz, Christian L.
name: Shao, L.
name: Liu, Y.
name: Petrovic, C.
name: Singamaneni, Srinivasa R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We examine the magnetic properties of the quasi 2D ferrimagnetic single crystal Mn3Si2Te6 (MST) through critical phenomena and magnetic entropy analysis in the easy axis (H || ab) as a function of proton irradiance. Employing a modified asymptotic analysis method, we find that upon proton irradiation the critical exponents do not fall into any particular universality class but lie close to mean field critical exponents (γ = 1, \b{eta} = 0.5). The presence of long-range interactions can be safely assumed for the pristine and irradiated cases of MST examined in this work. Further analysis on the effective spatial dimensionality reveal that MST remains at d = 3 under proton irradiation transitioning from an n = 1 spin dimensionality to n = 2 and n=3 for 1 x 10^15 and 5 x 10^15 H+/cm^2, indicating an XY interaction and a Heisenberg interaction, respectively. The pair (spin-spin) correlation function reveals an increase in magnetic correlations at the proton irradiance of 5 x 10^15 H+/cm^2. In conjunction, the maximum change in magnetic entropy obtained from isothermal magnetization at 3 T is the largest for 5 x 10^15 H+/cm^2 with a value of 2.45 J/kgK at T = 73.66 K, in comparison to 1.60 J/kgK for pristine MST at T = 73 K. Magnetic entropy derived from zero-field heat capacity does not show large deviations across the proton irradiated samples. This suggests that the antiferromagnetic coupling between the Mn sites is stable even after proton irradiation. Such result implies that magnetization is enhanced through a strengthening of the super-exchange interaction between Mn atoms mediated through Te rather than a weakening of the AFM component. Overall, our study finds that the magnetic interactions are manipulated the greatest when MST is irradiated at 5 x 10^15 H+/cm^2.
Dynamical magnetic susceptibility in the lamellar cobaltate superconductor Na_xCoO_2$\cdot y$H_2O
Creators: name: Korshunov, M. M.
name: Eremin, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We systematically analyze the influence of the superconducting gap symmetry and the electronic structure on the dynamical spin susceptibility in superconducting Na_xCoO_2$\cdot y$H_2O within a three different models: the single a_{1g}-band model with nearest-neighbor hoppings, the realistic three-band t_{2g}-model with, and without e'_g pockets present at the Fermi surface. We show that the magnetic response in the normal state is dominated by the incommensurate antiferromagnetic spin density wave fluctuations at large momenta in agreement with experimental temperature dependence of the spin-lattice relaxation rate. Also, we demonstrate that the presence or the absence of the e'_g-pockets at the Fermi surface does not affect significantly this conclusion. In the superconducting state our results for d_{x^2-y^2}- or d_{xy}-wave symmetries of the superconducting order parameter are consistent with experimental data and exclude nodeless $d_{x^2-y^2} + id_{xy}$-wave symmetry. We further point out that the spin-resonance peak proposed earlier is improbable for the realistic band structure of Na_xCoO_2$\cdot y$H_2O. Moreover, even if present the resonance peak is confined to the antiferromagnetic wave vector and disappears away from it.
description: Published version, PACS: 74.70.-b; 75.40.Gb; 74.20.Rp; 74.25.Jb
'Universal' FitzGerald Contractions
Creators: name: Gogberashvili, Merab
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The model of a universe with a preferred frame, which nevertheless shares the main properties with traditional special and general relativity theories, is considered. We adopt Mach's interpretation of inertia and show that the energy balance equation, which includes the Machian energy of gravitational interactions with the universe, can imitate standard relativistic formulas.
description: The version accepted by Eur. Phys. J. C
Solving Conformal Field Theories with Artificial Intelligence
Creators: name: Kántor, Gergely
name: Niarchos, Vasilis
name: Papageorgakis, Constantinos
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we deploy for the first time Reinforcement-Learning algorithms in the context of the conformal-bootstrap programme to obtain numerical solutions of conformal field theories (CFTs). As an illustration, we use a soft Actor-Critic algorithm and find approximate solutions to the truncated crossing equations of two-dimensional CFTs, successfully identifying well-known theories like the 2D Ising model and the 2D CFT of a compactified scalar. Our methods can perform efficient high-dimensional searches that can be used to study arbitrary (unitary or non-unitary) CFTs in any spacetime dimension.
description: 6 pages; v2: references added
Quantification of risks during feasibility analysis for capital projects
Creators: name: Ranasinghe, Kulatilaka Arthanayake Malik Kumar
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of this thesis is to propose a consistent theory and a model based on it to estimate the uncertainty of project duration, cost, revenue, and net present value probabilistically. The model can be used to assist decision making on such strategic, feasibility analysis issues as contingency provision, reliability of an estimate for the "go-no go" decision, adopting phased or fast-track construction, etc. Project cost and revenue are evaluated in terms of current and discounted dollars, thereby emphasising the economic effect of time and inflation on net present value which is considered as the decision criterion. The model is derived mathematically by treating all the issues which effect the estimation of project cost, duration and revenue through the mechanism of linked work packages. Issues found to be significant in the evaluation of work package duration are: the scope of work, the productivity, and the labour usage. For work package cost they are: the duration and the starting time, unit rates for labour, equipment, and materials, labour and equipment usage, sub-contractor and indirect cost, inflation and interest rates. For revenue the issues are: the gross revenue, operating & maintenance cost, inflation rates, duration, and the starting time. Moments of work package cost, duration and revenue streams are first evaluated using subjective estimates of percentiles for the independent variables, deriving moment information from these estimates, and then processing this information using the expectation operator on the Taylor series expansion of the performance measure about the mean. These moments along with the Pearson family of distributions are used to quantify the uncertainty of project duration, cost, revenue, and net present value. The decision maker is provided with probabilistic estimates, of duration, cost and revenue at both the work package/revenue stream and project levels and of the net present value. A computer program is developed to implement the proposed theory and to organise and simplify the calculation process.
Interaction of non-Abelian tensor gauge fields
Creators: name: Savvidy, George
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently we introduced an extended vector bundle X on which non-Abelian tensor gauge fields realize a connection. Our aim here is to introduce interaction of these non-Abelian tensor gauge fields with fermions and bosons. We have found that there exist two series of gauge invariant forms describing this interaction. The linear sum of these forms comprises the general gauge invariant Lagrangian. Studying the corresponding Euler-Lagrange equations we found that a particular linear combination of these forms exhibits enhanced symmetry which guarantees the conservation of the corresponding high-rank currents. A possible mechanism of symmetry breaking and mass generation of tensor gauge bosons is suggested.
description: 18 pages, LaTex file
Considerations Across Three Cultures: Parametric Regressions, Interpretable Algorithms, and Complex Algorithms
Creators: name: Eloyan, Ani
name: Rose, Sherri
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: We consider an extension of Leo Breiman's thesis from "Statistical Modeling: The Two Cultures" to include a bifurcation of algorithmic modeling, focusing on parametric regressions, interpretable algorithms, and complex (possibly explainable) algorithms.
description: 7 pages, forthcoming in Observational Studies
Pure annihilation decays of $B_s^0 \to a_0^+ a_0^-$ and $B_d^0 \to K_0^{*+} K_0^{*-}$ in the PQCD approach
Creators: name: Chen, Yutong
name: Jiang, Zewen
name: Liu, Xin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the {\it CP}-averaged branching fractions and the {\it CP}-violating asymmetries in the pure annihilation decays of $B_s^0 \to a_0^+ a_0^-$ and $B_d^0 \to K_0^{*+} K_0^{*-}$, where $a_0\;[K_0^*]$ denotes the scalar $a_0(980)$ and $a_0(1450)$ [$K_0^*(800) ( {\rm or}\; κ)$ and $K_0^*(1430)$], with the perturbative QCD factorization approach under the assumption of two-quark structure for the $a_0$ and $K_0^*$ states. The numerical results show that the branching ratios of the $B_d^0 \to K_0^{*+} K_0^{*-}$ decays are in the order of $10^{-6}$, while the decay rates of the $B_s^0 \to a_0^+ a_0^-$ modes are in the order of $10^{-5}$. In light of the measured modes with the same quark components in the pseudoscalar sector, namely, $B_d^0 \to K^+ K^-$ and $B_s^0 \to π^+ π^-$, the predictions for the considered decay modes in this work are expected to be measured at the Large Hadron Collider beauty and/or Belle-II experiments in the (near) future. Meanwhile, it is of great interest to find that the twist-3 distribution amplitudes $ϕ^{S}$ and $ϕ^{T}$ with inclusion of the Gegenbauer polynomials for the scalar $a_0(1450)$ and $K_0^*(1430)$ states in scenario 2 contribute slightly to the branching ratios while significantly to the {\it CP} violations in the $B_d^0 \to {K_0^*}(1430)^+ {K_0^*}(1430)^-$ and $B_s^0 \to a_0(1450)^+ a_0(1450)^-$ decays, which indicates that, compared to the asymptotic $ϕ^S$ and $ϕ^T$, these Gegenbauer polynomials could change the strong phases evidently in these pure annihilation decay channels. These predictions await for the future confirmation experimentally, which could further provide useful information to help explore the inner structure of the scalars and shed light on the annihilation decay mechanism.
description: 12 pages, 1 figure
The unusual hydrocarbon emission from the early carbon star HD 100764: The connection between aromatics and aliphatics
Creators: name: Sloan, G. C.
name: Jura, M.
name: Duley, W. W.
name: Kraemer, K. E.
name: Bernard-Salas, J.
name: Forrest, W. J.
name: Sargent, B.
name: Li, A.
name: Barry, D. J.
name: Bohac, C. J.
name: Watson, D. M.
name: Houck, J. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have used the Infrared Spectrograph (IRS) on the Spitzer Space Telescope to obtain spectra of HD 100764, an apparently single carbon star with a circumstellar disk. The spectrum shows emission features from polycyclic aromatic hydrocarbons (PAHs) that are shifted to longer wavelengths than normally seen, as characteristic of ``class C'' systems in the classification scheme of Peeters et al. All seven of the known class C PAH sources are illuminated by radiation fields that are cooler than those which typically excite PAH emission features. The observed wavelength shifts are consistent with hydrocarbon mixtures containing both aromatic and aliphatic bonds. We propose that the class C PAH spectra are distinctive because the carbonaceous material has not been subjected to a strong ultraviolet radiation field, allowing relatively fragile aliphatic materials to survive.
description: 11 pages (in emulateapj), 5 tables, 7 figures. Accepted for publication in ApJ
A Subsampling-Based Method for Causal Discovery on Discrete Data
Creators: name: Goddard, Austin
name: Xiang, Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Inferring causal directions on discrete and categorical data is an important yet challenging problem. Even though the additive noise models (ANMs) approach can be adapted to the discrete data, the functional structure assumptions make it not applicable on categorical data. Inspired by the principle that the cause and mechanism are independent, various methods have been developed, leveraging independence tests such as the distance correlation measure. In this work, we take an alternative perspective and propose a subsampling-based method to test the independence between the generating schemes of the cause and that of the mechanism. Our methodology works for both discrete and categorical data and does not imply any functional model on the data, making it a more flexible approach. To demonstrate the efficacy of our methodology, we compare it with existing baselines over various synthetic data and real data experiments.
description: Accepted to the 2021 IEEE Statistical Signal Processing Workshop
Solving the paradox of the solar sodium D1 line polarization
Creators: name: Ballester, Ernest Alsina
name: Belluzzi, Luca
name: Bueno, Javier Trujillo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Twenty-five years ago, enigmatic linear polarization signals were discovered in the core of the sodium D1 line. The only explanation that could be found implied that the solar chromosphere is practically unmagnetized, in contradiction with other evidences. This opened a paradox that has challenged physicists for many years. Here we present its solution, demonstrating that these polarization signals can be properly explained in the presence of magnetic fields in the gauss range. This result opens a novel diagnostic window for exploring the elusive magnetism of the solar chromosphere.
description: Main article has a length of 5 pages and contains 2 figures. Supplemental Material has a length of 6 pages and contains 3 figures. Note that the main article and the Supplemental Material have separate reference lists. Article published in open access by Physical Review Letters on 18/08/2021; Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.081101
Il processo di vulcanizzazione nelle gomme stirene-butadiene: meccanismi di reazione, coinvolgimento di additivi e loro processi di migrazione
Creators: name: Di Florio, Giuseppe
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2009

description: La composizione di una mescola di gomma è varia e prevede la presenza di plasticizzanti, attivatori ed acceleranti della reazione di vulcanizzazione, anti-ozonanti e resine. La dispersione e la diffusione di tali sostanze nella matrice gommosa influenza, sia in fase di processo che di esercizio, le proprietà e le prestazioni della mescola. Nell’industria dei pneumatici e della gomma in genere è particolarmente sentito il problema della migrazione di sostanze a basso peso molecolare dall’interno del materiale verso la superficie del manufatto. Inoltre nel processo di cura si innescano diverse reazioni chimiche, alcune competitive con la formazione dei ponti zolfo che assicurano la vulcanizzazione della gomma, che possono inficiare le caratteristiche finali del prodotto
Statistical comparison of ensemble implementations of Grover's search algorithm to classical sequential searches
Creators: name: Kott, Tomasz M.
name: Collins, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We compare pseudopure state ensemble implementations, quantified by their initial polarization and ensemble size, of Grover's search algorithm to probabilistic classical sequential search algorithms in terms of their success and failure probabilities. We propose a criterion for quantifying the resources used by the ensemble implementation via the aggregate number of oracle invocations across the entire ensemble and use this as a basis for comparison with classical search algorithms. We determine bounds for a critical polarization such that the ensemble algorithm succeeds with a greater probability than the probabilistic classical sequential search. Our results indicate that the critical polarization scales as N^(-1/4) where N is the database size and that for typical room temperature solution state NMR, the polarization is such that the ensemble implementation of Grover's algorithm would be advantageous for N > 10^22
La risposta idraulica di barriere sommerse in campo non lineare
Creators: name: Ciardulli, Francesco
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2009

description: Submerged breakwaters are a very common structural solution employed for shore erosion control. Predicting wave climate leeward the barriers is indeed the main task to the functional design of such structures; this because it rules the distribution of wave thrusts in the protected area that, in turn, governs hydrodynamic and morphodynamic processes. In this regard it should be noticed that the interaction between waves and submerged breakwaters is a strongly non-linear process. In fact, when water waves come across the structure, multiple-frequency harmonic wave components arise, generating a transmitted wave field very different from the incident one. The super-harmonics consist of phase-locked waves to the fundamental one plus free waves that travels with their own phase speed in the shadow zone. These components interact leading all kinematic and dynamic quantities to spatially fluctuate behind the structure. The aim of this work is to investigate the main characteristics of the non-linear interaction between waves and submerged barriers for conditions of both breaking and no-breaking waves over the structure crown. For this purpose a long series of laboratory experiments have been carried out at the small scale wave flume of the Hydraulic, Geotechnical and Environmental Engineering Department (DIGA) of University of Naples “Federico II”. Models of rubble-mound submerged breakwaters with different geometries and porosity have been employed under the action of regular waves with different height and period. The free surface elevation process has been acquired at several positions leeward of structure models. Experimental results clearly show that the wave shape in the sheltered area is non-permanent leading the profile asymmetry coefficients spatially fluctuate as well as the twice frequency Fourier modes. This behavior, due to the interaction between phase-locked waves and free waves, leads the variance profile (i.e. the spectrum area) to fluctuate in the same way making the definition itself of transmitted wave height quite uncertain. As a further result it has been noticed that higher harmonics transmitted rate reaches a maximum value when waves start breaking over the structure and then, with increasing of dissipation process, to be reduced lying in a saturation curve.