cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fluorescence and Hybrid Detection Aperture of the Pierre Auger Observatory
Creators: name: Bellido, J. A.
name: D'Urso, D.
name: Geenen, H.
name: Guarino, F.
name: Perrone, L.
name: Petrera, S.
name: Prado, L.
name: Salamida, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The aperture of the Fluorescence Detector (FD) of the Pierre Auger Observatory is evaluated from simulated events using different detector configurations: mono, stereo, 3-FD and 4-FD. The trigger efficiency has been modeled using shower profiles with ground impacts in the field of view of a single telescope and studying the trigger response (at the different levels) by that telescope and by its neighbours. In addition, analysis cuts imposed by event reconstruction have been applied. The hybrid aperture is then derived for the Auger final extension. Taking into account the actual Surface Detector (SD) array configuration and its trigger response, the aperture is also calculated for a typical configuration of the present phase.
description: contribution to the 29th International Cosmic Ray Conference, Pune, India, 3-10 August 2005
THE COTTON ACREAGE EFFECTS OF BOLL WEEVIL ERADICATION: A COUNTY-LEVEL ANALYSIS
Creators: name: Dumas, Christopher F.
name: Goodhue, Rachael E.
name: Dumas, Christopher F.
name: Goodhue, Rachael E.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Crop Production/Industries
subject: acreage effects and policy evaluation
subject: boll weevil eradication program
subject: cotton
subject: integrated pest management (IPM)

description: The success of the Boll Weevil Eradication (BWE) Program is believed to be one factor underlying the recent increase in cotton acreage in the Southeast. We find weak evidence that the initial, eradication phase of the BWE program decreases cotton acreage, and strong evidence that the second, maintenance phase of the program increases acreage. The full benefits associated with a BWE program may not become apparent until acreage adjustments occur, four to five years after program initiation. Our results indicate that for a representative sample county neglecting acreage effects may lead to underestimation of BWE program net benefits by 9 percent-12 percent.
Improved Nearly-MDS Expander Codes
Creators: name: Roth, Ron M.
name: Skachek, Vitaly
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: A construction of expander codes is presented with the following three properties: (i) the codes lie close to the Singleton bound, (ii) they can be encoded in time complexity that is linear in their code length, and (iii) they have a linear-time bounded-distance decoder. By using a version of the decoder that corrects also erasures, the codes can replace MDS outer codes in concatenated constructions, thus resulting in linear-time encodable and decodable codes that approach the Zyablov bound or the capacity of memoryless channels. The presented construction improves on an earlier result by Guruswami and Indyk in that any rate and relative minimum distance that lies below the Singleton bound is attainable for a significantly smaller alphabet size.
description: Part of this work was presented at the 2004 IEEE Int'l Symposium on Information Theory (ISIT'2004), Chicago, Illinois (June 2004). This work was submitted to IEEE Transactions on Information Theory on January 21, 2005. To appear in IEEE Transactions on Information Theory, August 2006. 12 pages
An order-adaptive compact approximation Taylor method for systems of conservation laws
Creators: name: Carrillo, H.
name: Macca, E.
name: Russo, G.
name: Parés, C.
name: Zorío, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We present a new family of high-order shock-capturing finite difference numerical methods for systems of conservation laws. These methods, called Adaptive Compact Approximation Taylor (ACAT) schemes, use centered $(2p + 1)$-point stencils, where $p$ may take values in $\{1, 2, \dots, P\}$ according to a new family of smoothness indicators in the stencils. The methods are based on a combination of a robust first order scheme and the Compact Approximate Taylor (CAT) methods of order $2p$-order, $p=1,2,\dots, P$ so that they are first order accurate near discontinuities and have order $2p$ in smooth regions, where $(2p +1)$ is the size of the biggest stencil in which large gradients are not detected. CAT methods, introduced in \cite{CP2019}, are an extension to nonlinear problems of the Lax-Wendroff methods in which the Cauchy-Kovalesky (CK) procedure is circumvented following the strategy introduced in \cite{ZBM2017} that allows one to compute time derivatives in a recursive way using high-order centered differentiation formulas combined with Taylor expansions in time. The expression of ACAT methods for 1D and 2D systems of balance laws are given and the performance is tested in a number of test cases for several linear and nonlinear systems of conservation laws, including Euler equations for gas dynamics.
Superconductivity in disordered thin films: giant mesoscopic fluctuations
Creators: name: Skvortsov, M. A.
name: Feigel'man, M. V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We discuss intrinsic inhomogeneities of superconductive properties of uniformly disordered thin films with large dimensionless conductance g. It is shown that mesoscopic fluctuations, which usually contain a small factor 1/g, are crucially enhanced near the critical conductance g_c >> 1 where superconductivity is destroyed at T=0 due to Coulomb suppression of the Cooper attraction. This leads to strong spatial fluctuations of the local transition temperature and thus to percolative nature of the thermal superconductive transition.
description: 4 pages, 3 figures, REVTeX 4
PRRS AND THE NORTH AMERICAN SWINE TRADE: A TRADE BARRIER ANALYSIS
Creators: name: Petry, Mark
name: Paarlberg, Philip L.
name: Lee, John G.
name: Petry, Mark
name: Paarlberg, Philip L.
name: Lee, John G.
Publisher: name: Unknown
Year: 1999
Subjects: subject: International Relations/Trade
subject: livestock health risk
subject: PRRS
subject: trade barriers

description: The partial equilibrium model links the infection risk from imported products to a premium, which compensates the importing country for the risk incurred by allowing imports from infected countries. The model is applied to the Porcine Reproductive and Respiratory Syndrome (PRRS) and Mexican live swine imports. The premium is sensitive to the expected loss from a PRRS outbreak and to the magnitude of the risk. As the risk or severity of PRRS rises, so does the level of the barrier. If swine imports are categorized and appropriate restrictions applied, an acceptable level of disease protection can be achieved while improving national welfare.
Multi-step quantum secure direct communication using multi-particle Green-Horne-Zeilinger state
Creators: name: Wang, Chuan
name: Deng, Fu Guo
name: Long, Gui Lu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A multi-step quantum secure direct communication protocol using blocks of multi-particle maximally entangled state is proposed. In this protocol, the particles in a Green-Horne-Zeilinger state are sent from Alice to Bob in batches in several steps. It has the advantage of high efficiency and high source capacity.
description: 4 pages and 1 figure. Revised version of Optics Communications 253 (2005(15
Compléments à l'article Literatur de D.O. Edzard, RlA 7, 1/2 (1987) 35-48
Creators: name: Attinger, Pascal
Publisher: name: Zenodo
Year: 2019

description: Compléments à l’article Literatur de D.O. Edzard, RlA 7, 1/2 (1987) 35-48 (choix) Pascal Attinger, Février 2019 aktualisiert 2020 aktualisiert 2021
Compressible Navier-Stokes-Fourier flows at steady-state
Creators: name: Consiglieri, Luisa
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: Primary: 76N06, 80A19, Secondary: 35Q35, 35Q79, 35R05, 35B45

description: The heat conducting compressible viscous flows are governed by the Navier-Stokes-Fourier (NSF) system. In this paper, we study the NSF system accomplished by the Newton law of cooling for the heat transfer at the boundary. On one part of the boundary, we consider the Navier slip boundary condition, while in the remaining part the inlet and outlet occur. The existence of a weak solution is proved via a new fixed point argument. With this new approach, the weak solvability is possible in Lipschitz domains, by making recourse to \(L^q\)-Neumann problems with \(q>n\).Thus, standard existence results can be applied to auxiliary problems and the claim follows by compactness techniques. Quantitative estimates are established.
description: 23 pages, 1 table, 1 figure
Platelet factor XIII contributes to the hemostatic process : factor XIII interactions at the platelet surface and with the internal platelet skeleton
Creators: name: Serrano, Katherine
Publisher: name: University of British Columbia
Year: 2009

description: During blood clot formation, the transglutaminase, FXIII, functions to chemically crosslink fibrin and α[sub 2]-antiplasmin to fibrin polymers. This strengthens and stabilizes the clot. Activated platelets accelerate these crosslinking reactions via the presentation of surfacebound active FXIII. The platelet cytoplasm contains approximately half of the FXIII content circulating in blood, yet the function of cytoplasmic FXIII is poorly understood at present. This thesis investigated the function of platelet FXIII in processes both outside and inside the platelet by studying the interactions of FXIII with fibrin(ogen) and with platelet cytoskeletal proteins. Surface associations determined using specific antibodies and flow cytometry indicate that FXIIIa association with platelets, occurred at early stages of activation, was partially reversible, correlated significantly with fibrinogen expression, and was enhanced after alkylation of the active-site cysteine. Immunoblotting experiments indicate that surface-associated fibrin(ogen) was crosslinked but not directly to the platelet surface. In aggregometry experiments, FXIIIa slightly enhanced the rate although not the final amount of aggregation. FXIII was present in the cytoskeletal fractions of the platelet lysate separated with centrifugation. When these fractions were immobilized on nitrocellulose membranes, activated but not resting FXIII bound to cytoskeletal proteins. With fluorescence microscopy, an actin polymerization-dependent, transient translocation of FXIII from a diffuse homogeneous distribution throughout the cytoplasm to the platelet periphery was observed upon platelet activation suggesting an association with cytoskeletal proteins. There was also a measurable increase in the transglutaminase activity o f the cytoskeletal fractions of activated platelets. Immunoblotting analysis of such cytoskeletal fractions identified that the focal adhesion proteins, filamin and vinculin were crosslinked upon platelet activation. In summary, this study has demonstrated several new factors that affect the interactions of FXIII on the platelet surface, which could affect the promotion of fibrin polymer crosslinking by platelets. In addition to its role on the outside of platelets in stabilizing the fibrin clot, a role for FXIII on the inside of platelets in stabilizing focal adhesions can now be proposed. It appears that FXIII may enable clot retraction by strengthening structural elements required for such a process on both sides of the platelet plasma membrane.
The Color Selection of Quasars from Redshifts 5 to 10: Cloning and Discovery
Creators: name: Chiu, Kuenley
name: Zheng, Wei
name: Schneider, Donald P.
name: Glazebrook, Karl
name: Iye, Masanori
name: Kashikawa, Nobunari
name: Tsvetanov, Zlatan
name: Yoshida, Michitoshi
name: Brinkmann, Jon
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present simulations of quasar colors, magnitudes, and numbers at redshifts 56 epoch taking advantage of the new UKIDSS near-infrared filter set, and we examine the redshift intervals of maximum productivity, discussing color selection and survey depth issues. On the basis of the SDSS sample, we find that the surface density of z>4.7 quasars increases by a factor of 3X by extending 0.7 i-magnitudes deeper than the SDSS spectroscopic survey limit of i=20.2 -- correspondingly we predict a total of ~400 faint quasars in the SDSS main area that have redshift z>4.7 and magnitudes $<20.9.
description: 14 pages, 11 Postscript figures, uses emulateapj.sty The Astronomical Journal, accepted, in press
LE BURUNDI
Creators: name: Magalhaes, Eduardo Castelo
name: Beintema, Nienke M.
name: Ndimurirwo, Leonidas
name: Magalhaes, Eduardo Castelo
name: Beintema, Nienke M.
name: Ndimurirwo, Leonidas
Publisher: name: Unknown
Year: 2003
Subjects: Research and Development/Tech Change/Emerging Technologies

description: Le présent document étudie les principaux investissements réalisés dans la recherche agricole publique au Burundi et les tendances institutionnelles qui se sont manifestées dans ce domaine depuis le début des années 90 en se basant sur de nouvelles données d’enquête rassemblées dans le cadre de l’Initiative des Indicateurs relatifs aux sciences et technologies agricoles ou ASTI (IFPRI–ISNAR–ASARECA 2001–02).
A heterogeneous branch and multi-level classification network for person re-identification
Creators: name: Wang, Jiabao
name: Li, Yang
name: Zhang, Yangshuo
name: Miao, Zhuang
name: Zhang, Rui
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Convolutional neural networks with multiple branches have recently been proved highly effective in person re-identification (re-ID). Researchers design multi-branch networks using part models, yet they always attribute the effectiveness to multiple parts. In addition, existing multi-branch networks always have isomorphic branches, which lack structural diversity. In order to improve this problem, we propose a novel Heterogeneous Branch and Multi-level Classification Network (HBMCN), which is designed based on the pre-trained ResNet-50 model. A new heterogeneous branch, SE-Res-Branch, is proposed based on the SE-Res module, which consists of the Squeeze-and-Excitation block and the residual block. Furthermore, a new multi-level classification joint objective function is proposed for the supervised learning of HBMCN, whereby multi-level features are extracted from multiple high-level layers and concatenated to represent a person. Based on three public person re-ID benchmarks (Market1501, DukeMTMC-reID and CUHK03), experimental results show that the proposed HBMCN reaches 94.4%, 85.7% and 73.8% in Rank-1, and 85.7%, 74.6% and 69.0% in mAP, achieving a state-of-the-art performance. Further analysis demonstrates that the specially designed heterogeneous branch performs better than an isomorphic branch, and multi-level classification provides more discriminative features compared to single-level classification. As a result, HBMCN provides substantial further improvements in person re-ID tasks.
Most precise single redshift bound to Delta alpha/alpha
Creators: name: Levshakov, S. A.
name: Centurion, M.
name: Molaro, P.
name: D'Odorico, S.
name: Reimers, D.
name: Quast, R.
name: Pollmann, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Verification of theoretical predictions of an oscillating behavior of the fine-structure constant alpha with cosmic time requires high precision Delta alpha/alpha measurements at individual redshifts, while in earlier studies the mean Delta alpha/alpha values averaged over wide redshift intervals were usually reported. This requirement can be met via the single ion differential alpha measurement (SIDAM) procedure proposed in Levshakov et al. (2005). We apply the SIDAM to the FeII lines associated with the damped Ly-alpha system observed at z=1.15 in the spectrum of HE0515-4414. The weighted mean calculated on base of carefully selected 34 FeII pairs {1608,X} (X = 2344, 2374, and 2586 A) is = (-0.07+/-0.84) 10^{-6} (1sigma C.L.). The precision of this estimate improves by a factor 2 the previous one reported for the same system by Quast et al. (2004). The obtained result represents an absolute improvement with respect to what has been done in the measurements of Delta alpha/alpha.
description: 12 pages, 8 figures, 8 tables; accepted for publication in A&A
Evolutionary dynamics in an SI epidemic model with phenotype-structured susceptible compartment
Creators: name: Lorenzi, Tommaso
name: Pugliese, Andrea
name: Sensi, Mattia
name: Zardini, Agnese
Publisher: name: arXiv
Year: 2020
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Analysis of PDEs (math.AP)
subject: FOS: Biological sciences
subject: FOS: Mathematics

description: We present an SI epidemic model whereby a continuous variable captures variability in proliferative potential and resistance to infection among susceptibles. The occurrence of heritable, spontaneous changes in these phenotype and the presence of a fitness trade-off between resistance to infection and proliferative potential are incorporated into the model. The model comprises an ODE for the number of infected individuals that is coupled with a partial integrodifferential equation for the population density of susceptibles through an integral term. The expression for the basic reproduction number $\mathcal{R}_0$ is derived, the disease-free and endemic equilibrium of the model are characterised and a threshold theorem is proved. Analytical results are integrated with numerical simulations of a calibrated version of the model based on the results of artificial selection experiments in a host-parasite system. The results of our mathematical study disentangle the impact of different evolutionary parameters on the spread of infectious diseases and the consequent phenotypic adaption of susceptible individuals. In particular, these results provide a theoretical basis for the observation that infectious diseases exerting stronger selective pressures on susceptibles and being characterised by higher infection rates are more likely to spread. Moreover, our results indicate that spontaneous phenotypic changes in proliferative potential and resistance to infection can either promote or prevent the spread of diseases depending on the strength of selection acting on susceptible individuals prior to infection. Finally, we demonstrate that, when an endemic equilibrium is established, higher levels of resistance to infection and lower degrees of phenotypic heterogeneity are to be expected in the presence of infections which are characterised by lower rates of death and exert stronger selective pressures.
description: 29 pages, 8 figures
EKOLOJİK RESTORASYONA GİRİŞ
Creators: name: Karakurt, Hidayet
Publisher: name: figshare
Year: 2020
Subjects: subject: 50199 Ecological Applications not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 50101 Ecological Impacts of Climate Change
subject: Ecology
subject: FOS: Biological sciences
subject: 50104 Landscape Ecology
subject: 60207 Population Ecology
subject: 50103 Invasive Species Ecology
subject: 60203 Ecological Physiology
subject: 50102 Ecosystem Function
subject: 50207 Environmental Rehabilitation (excl. Bioremediation)

description: Turkish translation of The SER International Primer on Ecological Restoration
UGANDA
Creators: name: Beintema, Nienke M.
name: Tizikara, Clesensio
name: Beintema, Nienke M.
name: Tizikara, Clesensio
Publisher: name: Unknown
Year: 2002
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This brief reviews the major investment and institutional trends in Ugandan public agricultural research since the early 1990s, drawing directly on a new set of survey data collected through the Agricultural Science and Technology Indicators (ASTI) initiative.
Wave-like spatially homogeneous models of Stackel spacetimes (2.1) type in the scalar-tensor theory of gravity
Creators: name: Osetrin, K.
name: Filippov, A.
name: Osetrin, E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Six exact solutions are obtained in the general scalar-tensor theory of gravity related to spatially homogeneous wave-like models of the Universe. Wave-like space-time models allow the existence of privileged coordinate systems where the eikonal equation and the Hamilton-Jacobi equation of test particles can be integrated by the method of complete separation of variables with the separation of isotropic (wave) variables on which the space metric depends (non-ignored variables). An explicit form of the scalar field and two functions of the scalar field that are part of the general scalar-tensor theory of gravity are found. The explicit form of the eikonal function and the action function for test particles in the considered models is given. The obtained solutions are of type III according to the classification Bianchi and type N according to the classification of Petrov.
description: 11 pages
XI Международная научно-практическая конференция «Актуальные аспекты развития науки и общества в эпоху цифровой трансформации»
Creators: name: ООО "Институт развития образования и консалтинга"
Publisher: name: ООО "Институт развития образования и консалтинга"
Year: 2024

description: XI Международная научно-практическая конференция «Актуальные аспекты развития науки и общества в эпоху цифровой трансформации»
Catastrophic Fermi surface reconstruction in the shape-memory alloy AuZn
Creators: name: Goddard, P. A
name: Singleton, J.
name: McDonald, R. D.
name: Harrison, N.
name: Lashley, J. C.
name: Harima, H.
name: Suzuki, M. -T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: AuZn undergoes a shape-memory transition at 67 K. The de Haas van Alphen effect persists to 100 K enabling the observation of a change in the quantum oscillation spectrum indicative of a catastrophic Fermi surface reconstruction at the transition. Coexistence of both Fermi surfaces at low temperatures is suggestive of an intrinsic phase separation in the bulk of the material. In addition, a Dingle analysis reveals a sharp change in the scattering mechanism at a threshold cyclotron radius, which we suggest to be related to the underlying microstructure that drives the shape-memory effect.
description: 4 pages, 4 figures
Probabilistic Inversions for Time-Distance Helioseismology
Creators: name: Jackiewicz, Jason
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Time-distance helioseismology is a set of powerful tools to study features below the Sun's surface. Inverse methods are needed to interpret time-distance measurements, with many examples in the literature. However, techniques that utilize a more statistical approach to inferences, and broadly used in the astronomical community, are less-commonly found in helioseismology. This article aims to introduce a potentially powerful inversion scheme based on Bayesian probability theory and Monte Carlo sampling that is suitable for local helioseismology. We describe the probabilistic method and how it is conceptually different from standard inversions used in local helioseismology. Several example calculations are carried out to compare and contrast the setup of the problems and the results that are obtained. The examples focus on two important phenomena studied with helioseismology: meridional circulation and supergranulation. Numerical models are used to compute synthetic observations, providing the added benefit of knowing the solution against which the results can be tested. For demonstration purposes, the problems are formulated in two and three dimensions, using both ray- and Born-theoretical approaches. The results seem to indicate that the probabilistic inversions not only find a better solution with much more realistic estimation of the uncertainties, but they also provide a broader view of the range of solutions possible for any given model, making the interpretation of the inversion more quantitative in nature. Unlike the progress being made in fundamental measurement schemes in local helioseismology that image the far side of the Sun, or have detected signatures of global Rossby waves, among many others, inversions of those measurements have had significantly less success. Such statistical methods may help overcome some of these barriers to move the field forward.
description: 25 pages, 14 figures. Accepted to Solar Physics (the arxiv version contains an added appendix C, and a shortened abstract)
Interaction-induced adiabatic cooling and antiferromagnetism of cold fermions in optical lattices
Creators: name: Werner, F.
name: Parcollet, O.
name: Georges, A.
name: Hassan, S. R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose an interaction-induced cooling mechanism for two-component cold fermions in an optical lattice. It is based on an increase of the ``spin'' entropy upon localisation, an analogue of the Pomeranchuk effect in liquid Helium 3. We discuss its application to the experimental realisation of the antiferromagnetic phase. We illustrate our arguments with Dynamical Mean-Field Theory calculations.
description: 4 pages, 4 figures
SOUTH AFRICA
Creators: name: Liebenberg, Frikkie
name: Beintema, Nienke M.
name: Kirsten, Johann F.
name: Liebenberg, Frikkie
name: Beintema, Nienke M.
name: Kirsten, Johann F.
Publisher: name: Unknown
Year: 2004
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This country brief reviews the major investment and institutional trends in South African agricultural research since the early 1970s, including a new set of survey data for the 1990s collected through the Agricultural Science and Technology Indicators (ASTI) initiative (IFPRI–ISNAR 2001–02).
New point-like sources and a conducting surface in Maxwell-Chern-Simons electrodynamics
Creators: name: Borges, L. H. C.
name: Barone, F. E.
name: Ribeiro, C. C. H.
name: Oliveira, H. L.
name: Fernandez, R. L.
name: Barone, F. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Classical Physics (physics.class-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate some aspects of the Maxwell-Chern-Simons electrodynamics focusing on physical effects produced by the presence of stationary sources and a perfectly conducting plate (mirror). Specifically, in addition to point charges, we propose two new types of point-like sources called topological source and Dirac point, and we also consider physical effects in various configurations that involve them. We show that the Dirac point is the source of the vortex field configurations. The propagator of the gauge field due to the presence of a conducting plate and the interaction forces between the plate and point-like sources are computed. It is shown that the image method is valid for the point-like charges as well as for Dirac points. For the topological source we show that the image method is not valid and the symmetry of spatial refection on the mirror is broken. In all setups considered, it is shown that the topological source leads to the emergence of torques.
description: 17 Latex pages, 7 figures
BURUNDI
Creators: name: Magalhaes, Eduardo Castelo
name: Beintema, Nienke M.
name: Ndimurirwo, Leonidas
name: Magalhaes, Eduardo Castelo
name: Beintema, Nienke M.
name: Ndimurirwo, Leonidas
Publisher: name: Unknown
Year: 2003
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This country brief reviews the major investment and institutional trends in Burundi’s public agricultural research since the early 1990s using new survey data collected under the Agricultural Science and Technology Indicators (ASTI) initiative (IFPRI–ISNAR–ASARECA 2001–02).
GHANA
Creators: name: Stads, Gert-Jan
name: Gogo, Joseph
name: Stads, Gert-Jan
name: Gogo, Joseph
Publisher: name: Unknown
Year: 2004
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This brief reviews the major investment and institutional trends in Ghanaian public agricultural research since the early 1970s, including a new set of survey data for the 1990s collected under the Agricultural Science and Technology Indicators (ASTI) in itiative (IFPRI-ISNAR-CORAF/WECARD 2002-2003).
Logics and Algorithms for Hyperproperties
Creators: name: Finkbeiner, Bernd
Publisher: name: CISPA
Year: 2024

description: System requirements related to concepts like information flow, knowledge, and robustness cannot be judged in terms of individual system executions, but rather require an analysis of the relationship between multiple executions. Such requirements belong to the class of hyperproperties, which generalize classic trace properties to properties of sets of traces. During the past decade, a range of new specification logics has been introduced with the goal of providing a unified theory for reasoning about hyperproperties. This paper gives an overview on the current landscape of logics for the specification of hyperproperties and on algorithms for satisfiability checking, model checking, monitoring, and synthesis.
MAURITANIA
Creators: name: Stads, Gert-Jan
name: Lo, Abdoulaye
name: Diallo, Boubacar Cisse
name: Stads, Gert-Jan
name: Lo, Abdoulaye
name: Diallo, Boubacar Cisse
Publisher: name: Unknown
Year: 2004
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This country brief reviews the major investment and institutional trends in public agricultural research in Mauritania since the early 1990s using new data collected under the Agricultural Science and Technology Indicators (ASTI) initiative (IFPRI–ISNAR–CORAF/WECARD 2002–03).
Crystal Symmetry, Electron-Phonon Coupling, and Superconducting Tendencies in Li$_2$Pd$_3$B and Li$_2$Pt$_3$B
Creators: name: Lee, K. -W.
name: Pickett, W. E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: After theoretical determination of the internal structural coordinates in Li$_2$Pd$_3$B, we calculate and analyze its electronic structure and obtain the frequencies of the two $A_g$ phonons (40.6 meV for nearly pure Li mode, 13.0 meV for the strongly mixed Pd-Li mode). Pd can be ascribed a $4d^{10}$ configuration, but strong 4d character remains up to the Fermi level. Small regions of flat bands occur at -70 meV at both the $Γ$ and X points. Comparison of the Fermi level density of states to the linear specific heat coefficient gives a dynamic mass enhancement of $λ$ = 0.75. Rough Fermi surface averages of the deformation potentials $D$ of individual Pd and Li displacements are obtained. While is small, ~ 1.15 eV/Åis sizable, and a plausible case exists for its superconductivity at 8 K being driven primarily by coupling to Pd vibrations. The larger d bandwidth in Li$_2$Pt$_3$B leads to important differences in the bands near the Fermi surface. The effect on the band structure of spin-orbit coupling plus lack of inversion is striking, and is much larger in the Pt compound.
description: 8 pages and 8embedded figures, to be appeared in PRB
Two-dimensional thermal finite element model of directed energy deposition: matching melt pool temperature profile with pyrometer measurement
Creators: name: Jelinek, Bohumir
name: Young, William J.
name: Dantin, Matthew
name: Furr, William
name: Doude, Haley
name: Priddy, Matthew W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: An open source two-dimensional (2D) thermal finite element (FE) model of the Directed Energy Deposition (DED) process is developed using the Python-based FEniCS framework. The model incrementally deposits material ahead of the laser focus point according to the geometry of the part. The laser heat energy is supplied by a Gaussian-distributed heat source while the phase change is represented by increased heat capacity around the solidus-liquidus temperature range. Experimental validation of the numerical model is performed by matching with the melt pool temperature measurements taken by a dual wavelength pyrometer during the build process of a box-shaped Ti--6Al--4V part with large geometrical voids. Effects of large geometrical voids on the melt pool shape and maximum melt pool temperature are examined. Both the numerical and experimental data show an increase in the melt pool size and temperature during deposition above large voids. The trailing edge of the melt pool's temperature profile obtained using the developed numerical model closely matches pyrometer measurements.
description: for associated animations and source code, see https://gitlab.com/bohumir1/2d-heat-ded/
Logics and Algorithms for Hyperproperties
Creators: name: Finkbeiner, Bernd
Publisher: name: CISPA
Year: 2023

description: System requirements related to concepts like information flow, knowledge, and robustness cannot be judged in terms of individual system executions, but rather require an analysis of the relationship between multiple executions. Such requirements belong to the class of hyperproperties, which generalize classic trace properties to properties of sets of traces. During the past decade, a range of new specification logics has been introduced with the goal of providing a unified theory for reasoning about hyperproperties. This paper gives an overview on the current landscape of logics for the specification of hyperproperties and on algorithms for satisfiability checking, model checking, monitoring, and synthesis.
From insulator to quantum Hall liquid at low magnetic fields
Creators: name: Huang, Tsai-Yu
name: Liang, C. -T.
name: Kim, Gil-Ho
name: Huang, C. F.
name: Huang, Chao-Ping
name: Lin, Jyun-Ying
name: Goan, Hsi-Sheng
name: Ritchie, D. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have performed low-temperature transport measurements on a GaAs two-dimensional electron system at low magnetic fields. Multiple temperature-independent points and accompanying oscillations are observed in the longitudinal resistivity between the low-field insulator and the quantum Hall (QH) liquid. Our results support the existence of an intermediate regime, where the amplitudes of magneto-oscillations can be well described by conventional Shubnikov-de Haas theory, between the low-field insulator and QH liquid.
description: Magneto-oscillations governed by Shubnikov-de Haas theory are observed between the low-field insulator and quantum Hall liquid
Eich, Hans (Hrsg.) / Frevert, Hans (Hrsg.), Freunde in aller Welt
Creators: name: Wischmann, Adolf
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 16 Nr. 2 (1967): Ökumenische Rundschau, Band 16, Heft 2
Bound-free pair production in relativistic nuclear collisions from the NICA to the HE LHC colliders
Creators: name: Bauer, D. A.
name: Karlovets, D. V.
name: Serbo, V. G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We consider the electron-positron pair production in relativistic heavy ion collisions, in which the produced electron is captured by one of the nuclei resulting, thus, in the formation of a hydrogen--like ion. These ions emerge from the collision point and hit the vacuum chamber wall inside superconducting magnets. Therefore, this process may be important for the problems of beam life time and for the quenching the irradiated magnet. A theoretical investigation for such a bound-free pair production (BFPP) at the colliders from NICA to HE LHC is presented. We obtain an approximate universal formula for the total cross section of the process. We compare it with the results of available numerical calculations and estimate that an accuracy of our calculations is better than $30$ % at the energies of the NICA collider and becomes of the order of a few percent for the RHIC and HE LHC colliders. Based on the obtained results, the detailed calculations are performed for future experiments at the NICA collider. We find that the expected BFPP cross sections for the Au$^{79+}$-Au$^{79+}$ and Bi$^{83+}$-Bi$^{83+}$ collisions are in the range from $10$ to $70$ barn, while for the p-Au$^{79+}$ and p-Bi$^{83+}$ collisions they are in the range of a few mbarn.
description: 10 pages, 6 figures
MPEC 2024-A125 : 2024 AB3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 AB3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Dynamical One-Armed Spiral Instability in Differentially Rotating Stars
Creators: name: Saijo, Motoyuki
name: Yoshida, Shin'ichirou
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the dynamical one-armed spiral instability in differentially rotating stars with both eigenmode analysis and hydrodynamic simulations in Newtonian gravity. We find that the one-armed spiral mode is generated around the corotation radius of the star, and the distribution of angular momentum shifts inwards the corotation radius during the growth of one-armed spiral mode. We also find by investigating the distribution of the canonical angular momentum density that the low T/|W| dynamical instability for both m=1 and m=2 mode, where T is the rotational kinetic energy and W is the gravitational potential energy, is generated around the corotation point. Finally, we discuss the feature of gravitational waves generated from these modes.
description: 6 pages with 6 eps figures, revsymb.sty. To appear in Proceedings of the 22nd Texas Symposium on Relativistic Astrophysics, Stanford, 2004, edited by P. Chen (SLAC Electronic Conference Proceedings)
Resolvent-based predictions for turbulent flow over anisotropic permeable substrates
Creators: name: Chavarin, Andrew
name: Gomez-de-Segura, Garazi
name: Garcia-Mayoral, Ricardo
name: Luhar, Mitul
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Recent simulations indicate that streamwise-preferential porous materials have the potential to reduce drag in wall-bounded turbulent flows(Gomez-de-Segura & Garcia-Mayoral 2019). This paper extends the resolvent formulation to study the effect of such anisotropic permeable substrates on turbulent channel flow. Under the resolvent formulation, the Fourier-transformed Navier-Stokes equations are interpreted as a linear forcing-response system. The nonlinear terms are considered the endogenous forcing in the system that gives rise to a velocity and pressure response. A gain-based decomposition of the forcing-response transfer function---the resolvent operator---identifies response modes (resolvent modes) that are known to reproduce important structural and statistical features of wall-bounded turbulent flows. The effect of permeable substrates is introduced in this framework using the Volume-Averaged Navier-Stokes equations and a generalized form of Darcy's law. Substrates with high streamwise permeability and low spanwise permeability are found to suppress the forcing-response gain for the resolvent mode that serves as a surrogate for the energetic near-wall cycle. This reduction in mode gain is shown to be consistent with the drag reduction trends predicted by theory and observed in numerical simulations. Simulation results indicate that drag reduction is limited by the emergence of spanwise rollers resembling Kelvin-Helmholtz vortices beyond a threshold value of wall-normal permeability. The resolvent framework also predicts the conditions in which such energetic spanwise-coherent rollers emerge. These findings suggest that a limited set of resolvent modes can serve as the building blocks for computationally-efficient models that enable the design and optimization of permeable substrates for passive turbulence control.
description: 24 pages, 8 figures
Newbigin, Lesslie, Missionarische Kirche in weltlicher Welt
Creators: name: Groscurth, Reinhard
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 16 Nr. 2 (1967): Ökumenische Rundschau, Band 16, Heft 2
Nonmagnetic-magnetic transition and magnetically ordered structure in SmS
Creators: name: Yoshida, S.
name: Koyama, T.
name: Yamada, H.
name: Nakai, Y.
name: Ueda, K.
name: Mito, T.
name: Kitagawa, K.
name: Haga, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: SmS, a prototypical intermediate valence compound, has been studied by performing high-pressure nuclear magnetic resonance measurements on a $^{33}$S-enriched sample. The observation of an additional signal below 15-20 K above a nonmagnetic-magnetic transition pressure $P_{\rm c2} \approx 2$ GPa gives evidence of a magnetic transition. The absence of a Curie-term in the Knight shift near $P_{\rm c2}$ indicates that the localized character of $4f$ electrons is entirely screened and the mechanism of the magnetic ordering is not described within a simple localized model. Simultaneously, the line shape in the magnetically ordered state is incompatible with a spin density wave order. These suggest that the magnetic order in SmS may require an understanding beyond the conventional framework for heavy fermions. The fact that hyperfine fields from the ordered moments cancel out at the S site leads us to a conclusion that the ordered phase has a type II antiferromagnetic structure.
Low-lying Dipole Modes in $^{26,28}$Ne in the Quasiparticle Relativistic Random Phase Approximation
Creators: name: Cao, Li-Gang
name: Ma, Zhong-Yu
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The low-lying isovector dipole strengths in neutron rich nuclei $^{26}$Ne and $^{28}$Ne are investigated in the quasiparticle relativistic random phase approximation. Nuclear ground state properties are calculated in an extended relativistic mean-field theory plus BCS method where the contribution of the resonant continuum to pairing correlations is properly treated. Numerical calculations are tested in the case of isovector dipole and isoscalar quadrupole modes in the neutron rich nucleus $^{22}$O. It is found that in present calculation low-lying isovector dipole strengths at $E_x < 10$ MeV in nuclei $^{26}$Ne and $^{28}$Ne exhaust about 4.9% and 5.8% of the Thomas-Reiche-Kuhn dipole sum rule, respectively. The centroid energy of the low-lying dipole excitation is located at 8.3 MeV in $^{26}$Ne and 7.9 MeV in $^{28}$Ne.
description: 20pages 5 figures. Accepted for publication in Physical Review C
Resistive Switching and Current Conduction Mechanisms in Hexagonal Boron Nitride Threshold Memristors with Nickel Electrodes
Creators: name: Völkel, Lukas
name: Braun, Dennis
name: Belete, Melkamu
name: Kataria, Satender
name: Wahlbrink, Thorsten
name: Ran, Ke
name: Kistermann, Kevin
name: Mayer, Joachim
name: Menzel, Stephan
name: Daus, Alwin
name: Lemme, Max C.
Publisher: name: Forschungzentrum Jülich
Year: 2023
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: arXiv (2023). doi:10.48550/ARXIV.2301.10158
description: The two-dimensional (2D) insulating material hexagonal boron nitride (h BN) has attracted much attention as the active medium in memristive devices due to its favorable physical properties, among others, a wide bandgap that enables a large switching window. Metal filament formation is frequently suggested for h-BN devices as the resistive switching (RS) mechanism, usually supported by highly specialized methods like conductive atomic force microscopy (C-AFM) or transmission electron microscopy (TEM). Here, we investigate the switching of multilayer hexagonal boron nitride (h-BN) threshold memristors with two nickel (Ni) electrodes through their current conduction mechanisms. Both the high and the low resistance states are analyzed through temperature-dependent current-voltage measurements. We propose the formation and retraction of nickel filaments along boron defects in the h-BN film as the resistive switching mechanism. We corroborate our electrical data with TEM analyses to establish temperature-dependent current-voltage measurements as a valuable tool for the analysis of resistive switching phenomena in memristors made of 2D materials. Our memristors exhibit a wide and tunable current operation range and low stand-by currents, in line with the state of the art in h-BN-based threshold switches, a low cycle-to-cycle variability of 5%, and a large On/Off ratio of 10${^7}$.
description: Published by arXiv
Optimal fingerprinting strategies with one-sided error
Creators: name: Scott, A. J.
name: Walgate, Jonathan
name: Sanders, Barry C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Fingerprinting enables two parties to infer whether the messages they hold are the same or different when the cost of communication is high: each message is associated with a smaller fingerprint and comparisons between messages are made in terms of their fingerprints alone. In the simultaneous message passing model, it is known that fingerprints composed of quantum information can be made exponentially smaller than those composed of classical information. For small message lengths, we present constructions of optimal classical fingerprinting strategies with one-sided error, in both the one-way and simultaneous message passing models, and provide bounds on the worst-case error probability with the help of extremal set theory. The performance of these protocols is then compared to that for quantum fingerprinting strategies constructed from spherical codes, equiangular tight frames and mutually unbiased bases.
description: 17 pages