cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Cosmological Acceleration as a Consequence of Quantum de Sitter Symmetry
Creators: name: Lev, Felix M.
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Physics (physics.gen-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Physicists usually understand that physics cannot (and should not) derive that $c\approx 3\cdot 10^8m/s$ and $\hbar \approx 1.054\cdot 10^{-34}kg\cdot m^2/s$. At the same time they usually believe that physics should derive the value of the cosmological constant $Λ$ and that the solution of the dark energy problem depends on this value. However, background space in General Relativity (GR) is only a classical notion while on quantum level symmetry is defined by a Lie algebra of basic operators. We prove that the theory based on Poincare Lie algebra is a special degenerate case of the theories based on de Sitter (dS) or anti-de Sitter (AdS) Lie algebras in the formal limit $R\to\infty$ where R is the parameter of contraction from the latter algebras to the former one, and $R$ has nothing to do with the radius of background space. As a consequence, $R$ is necessarily finite, is fundamental to the same extent as $c$ and $\hbar$, and a question why $R$ is as is does not arise. Following our previous publications, we consider a system of two free bodies in dS quantum mechanics and show that in semiclassical approximation the cosmological dS acceleration is necessarily nonzero and is the same as in GR if the radius of dS space equals $R$ and $Λ=3/R^2$. This result follows from basic principles of quantum theory. It has nothing to do with existence or nonexistence of dark energy and therefore for explaining cosmological acceleration dark energy is not needed. The result is obtained without using the notion of dS background space (in particular, its metric and connection) but simply as a consequence of quantum mechanics based on the dS Lie algebra. Therefore, $Λ$ has a physical meaning only on classical level and the cosmological constant problem and the dark energy problem do not arise.
description: 16 pages, no figures. A version published in Physics of Particles and Nuclei Letters. arXiv admin note: substantial text overlap with arXiv:1104.4647; text overlap with arXiv:1711.04607
Additional file 1 of Clinical characteristics and outcome of influenza virus infection among adults hospitalized with severe COVID-19: a retrospective cohort study from Wuhan, China
Creators: name: Tong, Xunliang
name: Xu, Xiaomao
name: Lv, Guoyue
name: Wang, He
name: Cheng, Anqi
name: Wang, Dingyi
name: Fan, Guohui
name: Zhang, Yue
name: Li, Yanming
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: Mental Health
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology

description: Additional file 1: Supplementary Table 1. Clinical Characteristics of COVID-19 Patients by death or discharge
Z-Pencils
Creators: name: McDonald, J. J.
name: Olesky, D. D.
name: Schneider, H.
name: Tsatsomeros, M. J.
name: Driessche, P. van den
Publisher: name: arXiv
Year: 1998
Subjects: subject: Rings and Algebras (math.RA)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 15A22 (Primary) 15A48, 05C50 (Secondary)

description: The matrix pencil (A,B) = {tB-A | t \in C} is considered under the assumptions that A is entrywise nonnegative and B-A is a nonsingular M-matrix. As t varies in [0,1], the Z-matrices tB-A are partitioned into the sets L_s introduced by Fiedler and Markham. As no combinatorial structure of B is assumed here, this partition generalizes some of their work where B=I. Based on the union of the directed graphs of A and B, the combinatorial structure of nonnegative eigenvectors associated with the largest eigenvalue of (A,B) in [0,1) is considered.
description: 8 pages, LaTex
title: Translations of Cellular Automata for Efficient Simulation
Creators: name: Weimar, Jörg
Publisher: name: Institut für Wissenschaftliches Rechnen
Year: 2002
Subjects: subject: cellular automata
subject: translation
subject: simulation
subject: optimization
subject: 510

description: Cellular automata can be described in many different ways, one of which is to use a special purpose description language. Here, the language CDL is used as the source for translations into Java or C code for computer simulations. Several coding styles are generated automatically: The state transition function can be coded as Java code, as C code with stubs for integration into a Java simulation environment, as a lookup table, or as Java code consisting of boolean functions which allow the parallel simulation of 32 or 64 cells on one processor. The coding styles are compared for several examples and it is found that the boolean function style (also called multispin-coding) realized in Java is often, but not always, significantly more efficient than even native C code.
description: Informatik-Berichte der Technischen Universität Braunschweig, vol. 2002-02
Noncommutative Algebraic Equations and Noncommutative Eigenvalue Problem
Creators: name: Schwarz, Albert
Publisher: name: arXiv
Year: 2000
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Rings and Algebras (math.RA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We analyze the perturbation series for noncommutative eigenvalue problem $AX=Xλ$ where $λ$ is an element of a noncommutative ring, $ A$ is a matrix and $X$ is a column vector with entries from this ring. As a corollary we obtain a theorem about the structure of perturbation series for Tr $x^r$ where $x$ is a solution of noncommutative algebraic equation (for $r=1$ this theorem was proved by Aschieri, Brace, Morariu, and Zumino, hep-th/0003228, and used to study Born-Infeld lagrangian for the gauge group $U(1)^k$).
description: 8 pages. Misprints corrected, references added
Bright mini-outburst ends the 12-year long activity of the black hole candidate Swift J1753.5-0127
Creators: name: Zhang, Guobao
name: Bernardini, F.
name: Russell, D. M.
name: Gelfand, J. D.
name: Lasota, J. -P.
name: Qasim, A. Al
name: AlMannaei, A.
name: Koljonen, K. I. I.
name: Shaw, A. W.
name: Lewis, F.
name: Tomsick, J. A.
name: Plotkin, R. M.
name: Miller-Jones, J. C. A.
name: Maitra, D.
name: Homan, J.
name: Charles, P. A.
name: Kobel, P.
name: Perez, D.
name: Doran, R.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present optical, UV and X-ray monitoring of the short orbital period black hole X-ray binary candidate Swift J1753.5-0127, focusing on the final stages of its 12$-$year long outburst that started in 2005. From September 2016 onward, the source started to fade and within three months, the optical flux almost reached the quiescent level. Soon after that, using a new proposed rebrightening classification method we recorded a mini-outburst and a reflare in the optical light curves, peaking in February (V$\rm\sim$17.0) and May (V$\rm\sim$17.9) 2017, respectively. Remarkably, the mini-outburst has a peak flux consistent with the extrapolation of the slow decay before the fading phase preceding it. The following reflare was fainter and shorter. We found from optical colors that the temperature of the outer disk was $\sim 11$,000 K when the source started to fade rapidly. According to the disk instability model, this is close to the critical temperature when a cooling wave is expected to form in the disk, shutting down the outburst. The optical color could be a useful tool to predict decay rates in some X-ray transients. We notice that all X-ray binaries that show mini-outbursts following a main outburst are short orbital period systems ($
description: 12 pages, 4 figures, accepted for publication in ApJ
Twisted Wess-Zumino-Witten models on elliptic curves
Creators: name: Kuroki, Gen
name: Takebe, Takashi
Publisher: name: arXiv
Year: 1996
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Investigated is a variant of the Wess-Zumino-Witten model called a twisted WZW model, which is associated to a certain Lie group bundle on a family of elliptic curves. The Lie group bundle is a non-trivial bundle with flat connection and related to the classical elliptic r-matrix. (The usual (non-twisted) WZW model is associated to a trivial group bundle with trivial connection on a family of compact Riemann surfaces and a family of its principal bundles.) The twisted WZW model on a fixed elliptic curve at the critical level describes the XYZ Gaudin model. The elliptic Knizhnik-Zamolodchikov equations associated to the classical elliptic r-matrix appear as flat connections on the sheaves of conformal blocks in the twisted WZW model.
description: 55 pages, LaTeX2e with AMS LaTeX package. (Version 1.4.2t: minor corrections of typographical errors, minor changes of bibliography format, support the old version of amslatex package (not LaTeX2e version).)
HUDUD DAROMAD SALOHIYATINING MOHIYATI HAMDA MAZMUNINING GNOSEOLOGIYASI
Creators: name: Qobulov Xotamjon Abdukarimovich, Toshkent davlat iqtisodiyot universiteti "Moliya" kafedrasi mudiri, i.f.n., professor
Publisher: name: Zenodo
Year: 2024

description: ushbu  materialda  hudud  daromad  salohiyatini  tadqiq  qilish natijalaridan  bir  lavha  keltirilgan  bo‘lib,  unda  hududiy  salohiyatning  tarkibiy elementlari  tarkiblashtirilgan, jumladan hududiy daromad salohiyati tushunchasiga yanada  aniqlik  kiritilgan.  Shuningdek,  byudjet  daromadlari  manbalari,  ularga nazariy qarashlar asoslab berilgan.
Additional file 3: of Comparison of two statistical indicators in communicating epidemiological results to the population: a randomized study in a high environmental risk area of Italy
Creators: name: Baccini, Michela
name: Ghirardi, Laura
name: Farinella, Domenica
name: Biggeri, Annibale
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Cell Biology
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology

description: Question on numerical skills. Description of the question on numerical skills. (PDF 33 kb)
Galaxy groups in the 2dF galaxy redshift survey: Luminosity and Mass Statistics
Creators: name: Martinez, H. J.
name: Zandivarez, A.
name: Merchan, M. E.
name: Dominguez, M. J. L.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Several statistics are applied to groups and galaxies in groups in the Two degree Field Galaxy Redshift Survey. Firstly we estimate the luminosity functions for different subsets of galaxies in groups. The results are well fitted by a Schechter function with parameters $M^{\ast}-5\log(h)=-19.90 \pm 0.03$ and $α=-1.13\pm0.02$ for all galaxies in groups, which is quite consistent with the results by Norberg et al. for field galaxies. When considering the four different spectral types defined by Madgwick et al. we find that the characteristic magnitude is typically brighter than in the field. We also observe a steeper value, $α=-0.76\pm 0.03$, of the faint end slope for low star-forming galaxies when compared with the corresponding field value. This steepening is more conspicuous, $α=-1.10\pm 0.06$, for those galaxies in more massive groups (${\mathcal M} \gsim 10^{14} h^{-1} M_{\odot}$) than the obtained in the lower mass subset, $α=-0.71\pm 0.04$ (${\mathcal M}<10^{14} h^{-1} M_{\odot}$). Secondly, we compute group total luminosities using Moore, Frenk & White prescriptions. We define a flux-limited group sample using a new statistical tool developed by Rauzy. The resulting group sample is used to determine the group luminosity function finding a good agreement with previous determinations and semianalytical models. Finally, the group mass function for the flux-limited sample is derived. An excellent agreement is obtained when comparing our determination with analytical predictions over two orders of magnitude in mass.
description: 10 pages, 7 figures, resubmitted to MNRAS after minor revision, 1 corrected figure and corrected typos
Splitting up entropy into vibrational and configurational contributions in bulk metallic glasses: A thermodynamic approach
Creators: name: Alvarez-Donado, René
name: Antonelli, Alex
Publisher: name: arXiv
Year: 2019
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We applied an efficient methodology to separate vibrational and configurational entropies in bulk metallic glasses by means of molecular dynamics simulation based on a combination of non-equilibrium adiabatic switching and reversible scaling methods. This approach involves calculating the vibrational free energy using the Einstein crystal as a reference for the solid phase and the recently proposed Uhlenbeck-Ford model for the fluid phase. This methodology has the advantage that it does not require a crystalline solid phase for separating the entropies. Therefore, in principle, it is applicable to any material, regardless of whether or not it has a crystalline phase. Using this methodology, we separate the vibrational and configurational entropies of two metallic glasses with different fragilities at zero external pressure, namely, Cu$_{50}$Zr$_{50}$ and Cu$_{46}$Zr$_{46}$Al$_{8}$. We find that the results for the former alloy are in quite reasonable agreement with recent experimental work by Smith \textit{et al.}[H. L. Smith \textit{et al.}, Nat. Phys. \textbf{13}, 900 (2017)]. We also find the configurational entropy of the glass containing Al to be 70\% larger than that of the other glass. Our results suggest that, although other factors may be at play, the configurational entropy can be used to investigate the effect of the addition of a minor-alloying element on the glass-forming ability of bulk metallic glasses.
description: 8 pages, 9 figures
How Often Do Single-Statement Bugs Occur? The ManySStuBs4J Dataset
Creators: name: Karampatsis, Rafael-Michael
name: Sutton, Charles
Publisher: name: arXiv
Year: 2019
Subjects: subject: Software Engineering (cs.SE)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Program repair is an important but difficult software engineering problem. One way to achieve acceptable performance is to focus on classes of simple bugs, such as bugs with single statement fixes, or that match a small set of bug templates. However, it is very difficult to estimate the recall of repair techniques for simple bugs, as there are no datasets about how often the associated bugs occur in code. To fill this gap, we provide a dataset of 153,652 single statement bug-fix changes mined from 1,000 popular open-source Java projects, annotated by whether they match any of a set of 16 bug templates, inspired by state-of-the-art program repair techniques. In an initial analysis, we find that about 33% of the simple bug fixes match the templates, indicating that a remarkable number of single-statement bugs can be repaired with a relatively small set of templates. Further, we find that template fitting bugs appear with a frequency of about one bug per 1,600-2,500 lines of code (as measured by the size of the project's latest version). We hope that the dataset will prove a resource for both future work in program repair and studies in empirical software engineering.
description: 5 pages; to appear in Proceedings of MSR 2020
Jiusi chuanming 酒肆傳名 Q00549_01_A
Creators: name: Admin, Textcourt
Publisher: name: University of Oxford
Year: 2025
Subjects: classificationCode: 470515
subject: Literature in Chinese

description: Launched in October 2019 at the University of Oxford, TEXTCOURT: Linking the Textual Worlds of Chinese Court Theater, ca. 1600-1800 is a five-year research project whose aim is to develop a digital archive of court drama texts to connect and link them with their local and global contexts. The project will enable textual studies of Chinese court drama and produce research publications and an anthology of English translations. It will contribute to the understanding of the role of Chinese court drama in world court cultures.
title: CF-105 aircraft maintenance requiring engine running
Creators: name: Collingwood, D.
Publisher: name: Avro Aircraft Limited (Canada). Engineering Division
Year: 1956
Subjects: subject: Avro Arrow
subject: Avro Arrow
subject: Avro Canada
subject: A.V. Roe Canada
subject: Avro Canada CF-105 Arrow
subject: CF-105
subject: Canada supersonic jet
subject: avion à réaction supersonique du Canada
subject: delta-winged supersonic interceptor
subject: intercepteur supersonique à ailes delta
subject: design and construction
subject: conception et construction

description: Includes "CF-105 engine running on the ground: addendum 1-LOG/105/30", September 1956, by Ridler, D. A.
description: Comprend « CF-105 engine running on the ground: addendum 1-LOG/105/30 », septembre 1956 par Ridler, D. A.
description: Distributed online by the National Research Council of Canada
description: Distribué en ligne par le Conseil national de recherches du Canada
Companion forms and weight one forms
Creators: name: Buzzard, Kevin
name: Taylor, Richard
Publisher: name: arXiv
Year: 1999
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this paper we prove the following theorem. Let L/\Q_p be a finite extension with ring of integers O_L and maximal ideal lambda. Theorem 1. Suppose that p >= 5. Suppose also that ρ:G_\Q -> GL_2(O_L) is a continuous representation satisfying the following conditions. 1. ρramifies at only finitely many primes. 2. ρmod λis modular and absolutely irreducible. 3. ρis unramified at p and ρ(Frob_p) has eigenvalues αand βwith distinct reductions modulo λ. Then there exists a classical weight one eigenform f = \sum_{n=1}^\infty a_m(f) q^m and an embedding of \Q(a_m(f)) into L such that for almost all primes q, a_q(f)=tr(ρ(\Frob_q)). In particular ρhas finite image and for any embedding i of L in \C, the Artin L-function L(i o ρ, s) is entire.
description: 15 pages, published version, abstract added in migration
Yanqing zhanli 延慶瞻禮 Q00550_01_A
Creators: name: Admin, Textcourt
Publisher: name: University of Oxford
Year: 2025
Subjects: classificationCode: 470515
subject: Literature in Chinese

description: Launched in October 2019 at the University of Oxford, TEXTCOURT: Linking the Textual Worlds of Chinese Court Theater, ca. 1600-1800 is a five-year research project whose aim is to develop a digital archive of court drama texts to connect and link them with their local and global contexts. The project will enable textual studies of Chinese court drama and produce research publications and an anthology of English translations. It will contribute to the understanding of the role of Chinese court drama in world court cultures.
Origin of the excess of high-energy retrograde stars in the Galactic halo
Creators: name: Matsuno, Tadafumi
name: Aoki, Wako
name: Suda, Takuma
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report on the very low $α$-element abundances of a group of metal-poor stars with high orbital energy and with large retrograde motion in the Milky Way halo, whose excess has been reported recently from metallicity and kinematics. We constructed a sample of halo stars with measured abundances and precise kinematics, including $\sim 880$ stars with [{{Fe}/{H}}]$
description: accepted for publication in ApJL
Huanjin jide 還金積德 Q00551_01_A
Creators: name: Admin, Textcourt
Publisher: name: University of Oxford
Year: 2025
Subjects: classificationCode: 470515
subject: Literature in Chinese

description: Launched in October 2019 at the University of Oxford, TEXTCOURT: Linking the Textual Worlds of Chinese Court Theater, ca. 1600-1800 is a five-year research project whose aim is to develop a digital archive of court drama texts to connect and link them with their local and global contexts. The project will enable textual studies of Chinese court drama and produce research publications and an anthology of English translations. It will contribute to the understanding of the role of Chinese court drama in world court cultures.
Percolation model for a selective response of the resistance of composite semiconducting np systems with respect to reducing gases
Creators: name: Ruß, Stefanie
Publisher: name: Freie Universität Berlin
Year: 2014
Subjects: subject: 500 Naturwissenschaften und Mathematik::530 Physik

description: It is shown that a two-component percolation model on a simple cubic lattice can explain an experimentally observed behavior [Savage et al., Sens. Actuators B 79, 17 (2001); Sens. Actuators B 72, 239 (2001).], namely, that a network built up by a mixture of sintered nanocrystalline semiconducting n and p grains can exhibit selective behavior, i.e., respond with a resistance increase when exposed to a reducing gas A and with a resistance decrease in response to another reducing gas B. To this end, a simple model is developed, where the n and p grains are simulated by overlapping spheres, based on realistic assumptions about the gas reactions on the grain surfaces. The resistance is calculated by random walk simulations with nn, pp, and np bonds between the grains, and the results are found in very good agreement with the experiments. Contrary to former assumptions, the np bonds are crucial to obtain this accordance.
Chaoyuan toupu 朝元偷譜 Q00548_01_A
Creators: name: Admin, Textcourt
Publisher: name: University of Oxford
Year: 2025
Subjects: classificationCode: 470515
subject: Literature in Chinese

description: Launched in October 2019 at the University of Oxford, TEXTCOURT: Linking the Textual Worlds of Chinese Court Theater, ca. 1600-1800 is a five-year research project whose aim is to develop a digital archive of court drama texts to connect and link them with their local and global contexts. The project will enable textual studies of Chinese court drama and produce research publications and an anthology of English translations. It will contribute to the understanding of the role of Chinese court drama in world court cultures.
Additional file 1 of The effect of double W tension-reduced suture technique on the abdominal scars following the da Vinci robot-assisted gastrectomy for severely obese patients
Creators: name: Chen, Wanying
name: Jiang, Tao
name: Zhong, Ziming
name: Wang, Xiaodong
name: Cao, Yang
name: Wu, Yujing
name: Gai, Haiyang
name: Zhang, Lianbo
name: Yu, Yang
Publisher: name: figshare
Year: 2023
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer
subject: Mental Health

description: Additional File 1: VSS score. Additional File 2: Digital photographs of scars. Additional File 3: Ultrasound of scars. Additional File 4: Patient satisfaction of scars.
Compositions of Polynomials with Coefficients in a given Field
Creators: name: Horwitz, Alan
Publisher: name: arXiv
Year: 1998
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 39B12

description: Let F and K be fields of characteristic 0, with F a subset of K. Let K[x] denote the ring of polynomials with coefficients in K. For p in K[x]\F[x], deg(p) = n, let r be the highest power of x with a coefficient not in F. We define the F deficit of p to be D_F(p) = n-r. For p in F[x], D_F(p) = n. Suppose that the leading coeffcients of p and q are in F, and that some coefficient of q(other than the constant term) is not in F. Our main result is that the F deficit of the composition of p with q equals the F deficit of q. This implies our earlier result: If p(q(x)) is in F[x]then p is in F[x] and/or q is in F[x]. We also prove similar results for compositions of the form p(q(x,y)), for the iterates of a polynomial, and for fields of finite characteristic, if the characteristic of the field does not divide the degree of p. Finally, If F and K are only rings, then we prove the inequality D_F(p(q(x))) >=D_F(q).
description: Minor modifications and corrections
Weighted, Bipartite, or Directed Stream Graphs for the Modeling of Temporal Networks
Creators: name: Latapy, Matthieu
name: Magnien, Clémence
name: Viard, Tiphaine
Publisher: name: arXiv
Year: 2019
Subjects: subject: Social and Information Networks (cs.SI)
subject: Data Structures and Algorithms (cs.DS)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We recently introduced a formalism for the modeling of temporal networks, that we call stream graphs. It emphasizes the streaming nature of data and allows rigorous definitions of many important concepts generalizing classical graphs. This includes in particular size, density, clique, neighborhood, degree, clustering coefficient, and transitivity. In this contribution, we show that, like graphs, stream graphs may be extended to cope with bipartite structures, with node and link weights, or with link directions. We review the main bipartite, weighted or directed graph concepts proposed in the literature, we generalize them to the cases of bipartite, weighted, or directed stream graphs, and we show that obtained concepts are consistent with graph and stream graph ones. This provides a formal ground for an accurate modeling of the many temporal networks that have one or several of these features.
title: Nonlinear Galerkin Methods for the Model Reduction of Nonlinear Dynamical Systems: Revised and expanded version of a contribution to the EUROMECH Coloquium 427, ENS Cachan France, September 2001
Creators: name: Matthies, Hermann
name: Meyer, Marcus
Publisher: name: Institut für Wissenschaftliches Rechnen
Year: 2002
Subjects: subject: Nonlinear Galerkin Method
subject: Postprocessed Galerkin Method
subject: Projection-based Model Reduction
subject: 510

description: Numerical simulations of large nonlinear dynamical systems, especially over long time intervalls, may be computationally very expensive. Model reduction methods have been used in this context for a long time, usually projecting the dynamical system onto a subspace of its phase space. Nonlinear Galerkin methods try to improve on this by projecting onto a submanifold which does not have to be flat. These methods are applied to the finite element model of a windturbine, where both the mechanical and the aerodynamical degrees of freedom can be considered for model reduction. For the internal forces (moments, section forces) the nonlinear Galerkin method gives a considerable increase in accuracy for very little computational cost.
description: Informatik-Berichte der Technischen Universität Braunschweig, vol. 2002-03
Simulations of the heating of the Galactic stellar disc
Creators: name: Hanninen, Jyrki
name: Flynn, Chris
Publisher: name: arXiv
Year: 2002
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The velocity dispersion of nearby stars in the Galactic disc is well known to increase substantially with age; this is the so-called Age-Velocity relation, and is interpreted as a ``heating'' of the disc as a function of time. We have studied the heating of the disc due to giant molecular clouds and halo black holes, using simulations of the orbits of tracer stars embedded in a patch of the local Galactic disc. We examine a range of masses and number densities of the giant molecular cloud and halo black hole perturbers. The heating of the stellar disc in the simulations is fit with a simple power law, and we also fit this form to the best determinations of Age-Velocity relation as derived from stars in the solar neighbourhood for which ages can be reliably assigned. Observationally, the Age-Velocity relation remains poorly constrained and its determination is probably still dominated by systematic errors. Our simulations confirm the well known results that there are insufficient GMCs to heat the Galactic disc appropriately. A range of dark halo black hole scenarios are verified to heat the stellar disc in the manner expected from analytical studies, and they reproduce the observed ratio of the stellar velocity dispersions. Simulations featuring a combination of giant molecular clouds and halo black holes can explain the observed heating of the stellar disc, but since other perturbing mechanisms, such as spiral arms, are yet to be included,we regard this solution as ad hoc.
description: 13 pages, 8 figures, accepted by MNRAS
title: Partitioned Strong Coupling Algorithms for Fluid-Structure-Interaction
Creators: name: Matthies, Hermann
name: Steindorf, Jan
Publisher: name: Institut für Wissenschaftliches Rechnen
Year: 2002
Subjects: subject: fluid-structure-interaction
subject: partitioned methods
subject: strong coupling
subject: block-Newton methods
subject: 510

description: Numerical simulation of fluid-structure interaction is often attempted in the context of partitioned methods, where already existing solvers for fluid or structure alone are used jointly. Mostly this is done by exchanging information from time step to time step in an alternating fashion. These weak coupling methods are explicit and hence suffer from possible instabilities. Therefore often strong coupling --- where equlibrium is satisfied jointly between fluid and structure in each time step --- is desired; the simplest computational procedure is similar to the time stepping an alternating iteration. We show why also this approach may experience difficulties, and how they may be circumvented with block-Newton methods, still in the partitioned framework, by only using the solvers of the subproblems fluid and structure.
description: Informatik-Berichte der Technischen Universität Braunschweig, vol. 2002-04
MAHALLIY BYUDJETLARNING MOLIYAVIY RESURSLARINI  SHAKLLANTIRISH VA ULARDAN SAMARALI FOYDALANISH  MASALALARI
Creators: name: Begmatova Pokiza Zayniddinovna, Toshkent davlat iqtisodiyot universiteti mustaqil tadqiqotchisi
Publisher: name: Zenodo
Year: 2024

description: Maqolada  mahalliy  byudjetlar  daromadlarini  shakllantirishda hududlarni  ijtimoiy-iqtisodiy  rivojlantirish  asosida  mahalliy  byudjetlar daromadlarini  oshirish  muhimligi  ta’kidlangan,  shuningdek,  byudjet  xarajatlari o‘rtasidagi  tenglik  va  barqarorlikni  ta’minlash  uchun  iqtisodiy  resurslardan samarali  foydalanish  va  ularni  boshqarishni  ta’minlash  masalalari  muhokama etilgan.
Optimal interplay between synaptic strengths and network structure enhances activity fluctuations and information propagation in hierarchical modular networks
Creators: name: Pena, Rodrigo F. O.
name: Lima, Vinicius
name: Shimoura, Renan O.
name: Novato, João P.
name: Roque, Antonio C.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: In network models of spiking neurons, the joint impact of network structure and synaptic parameters on activity propagation is still an open problem. Here we use an information-theoretical approach to investigate activity propagation in spiking networks with hierarchical modular topology. We observe that optimized pairwise information propagation emerges due to the increase of either (i) the global synaptic strength parameter or (ii) the number of modules in the network, while the network size remains constant. At the population level, information propagation of activity among adjacent modules is enhanced as the number of modules increases until a maximum value is reached and then decreases, showing that there is an optimal interplay between synaptic strength and modularity for population information flow. This is in contrast to information propagation evaluated among pairs of neurons, which attains maximum value at the maximum values of these two parameter ranges. By examining the network behavior under increase of synaptic strength and number of modules we find that these increases are associated with two different effects: (i) increase of autocorrelations among individual neurons, and (ii) increase of cross-correlations among pairs of neurons. The second effect is associated with better information propagation in the network. Our results suggest roles that link topological features and synaptic strength levels to the transmission of information in cortical networks.v
description: 19 pages, 7 figures
Reversible Boolean Networks I: Distribution of Cycle Lengths
Creators: name: Coppersmith, S. N.
name: Kadanoff, Leo P.
name: Zhang, Zhitong
Publisher: name: arXiv
Year: 2000
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider a class of models describing the dynamics of $N$ Boolean variables, where the time evolution of each depends on the values of $K$ of the other variables. Previous work has considered models with dissipative dynamics. Here we consider time-reversible models, which necessarily have the property that every possible point in the state-space is an element of one and only one cycle. As in the dissipative case, when K is large, typical orbit lengths grow exponentially with N, whereas for small enough K, typical orbit lengths grow much more slowly with N. The numerical data are consistent with the existence of a phase transition at which the average orbit length grows as a power of N at a value of K between 1.4 and 1.7. However, in the reversible models the interplay between the discrete symmetry and quenched randomness can lead to enormous fluctuations of orbit lengths and other interesting features that are unique to the reversible case. The orbits can be classified by their behavior under time reversal. The orbits that transform into themselves under time reversal have properties quite different from those that do not; in particular, a significant fraction of latter-type orbits have lengths enormously longer than orbits that are time reversal-symmetric. For large K and moderate N, the vast majority of points in the state-space are on one of the time reversal singlet orbits, and a random hopping model gives an accurate description of orbit lengths. However, for any finite K, the random hopping approximation fails qualitatively when N is large enough ($N\gg 2^{(2^K)}$).
description: 28 pages, 9 figures, Research paper sumbitted
Assessing Personality Traits Through Response Latencies Using Item Response Theory
Creators: name: Ranger, Jochen
name: Ortner, Tuulia M.
Publisher: name: Freie Universität Berlin
Year: 2011
Subjects: subject: 300 Sozialwissenschaften

description: Recent studies have revealed a relation between the given response and the response latency for personality questionnaire items in the form of an inverted-U effect, which has been interpreted in light of schema-driven behavior. In general, more probable responses are given faster. In the present study, the relationship between the probability of the given response and the response latency was investigated. First, a probabilistic model was introduced describing the relationship between response latencies and a latent trait. Second, the model was applied in an empirical study: Employing items from a personality questionnaire and using data from 170 men, the probability of responses were estimated based on the Rasch model. Assuming log-normally distributed response latencies, a linear regression model was fit to the logarithmized response latencies, including the response probability as a predictor. Findings suggested that the quantities are negatively related. This relation can be used to incorporate the response latency into the estimation of trait levels. For the scales used in the study, the results showed that test information could be increased by 13% to 17% when considering response latencies.
Modularity of fibres in rigid local systems
Creators: name: Darmon, Henri
Publisher: name: arXiv
Year: 1999
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: It is believed that any p-adic Galois representation which is potentially semistable arises from a modular form. The main theorem of Wiles establishes this modularity when the representation in question satisfies various technical restrictions, together with the key hypothesis that its reduction modulo p arises itself from a modular form. This article explains how a strong version of Wiles' "lifting theorem" implies the modularity of all hypergeometric abelian varieties - so-called because their periods are expressed in terms of values of classical hypergeometric functions. While this strong version remains unproved, various strengthenings of Wiles' original result, notably those arising from work of Wiles and Skinner, allow one to unconditionally establish the modularity of infinite collections of hypergeometric abelian varieties.
description: 8 pages, published version
title: Partitioned but Strongly Coupled Iteration Schemes for Nonlinear Fluid-Structure Interaction
Creators: name: Matthies, Hermann
name: Steindorf, Jan
Publisher: name: Institut für Wissenschaftliches Rechnen
Year: 2002
Subjects: subject: strong fluid-structure coupling
subject: 510

description: We look at the computational procedure of computing the response of a coupled fluid-structure interaction problem. We use the so called strong fluid-structure coupling --- a totally implicit formulation. At each time step in an implicit formulation, new values for the solution variables have to be computed by solving a nonlinear system of equations, where we assume that we have solvers for the subproblems. This is often the case, when we have existing software to solve each subproblem separately, and want to couple both. We show how to solve the overall nonlinear system by using only the solvers for the subproblems. This is achieved not by considering the equilibrium equations, but the fixed-point problem resulting from the solution iteration for each of the subproblems.
description: Informatik-Berichte der Technischen Universität Braunschweig, vol. 2002-05
The Waning of the WIMP: Endgame?
Creators: name: Arcadi, Giorgio
name: Cabo-Almeida, David
name: Dutra, Maíra
name: Ghosh, Pradipta
name: Lindner, Manfred
name: Mambrini, Yann
name: Neto, Jacinto P.
name: Pierre, Mathias
name: Profumo, Stefano
name: Queiroz, Farinaldo S.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Weakly Interacting Massive Particles (WIMPs) continue to be considered some of the best-motivated Dark Matter (DM) candidates. No conclusive signal, despite an extensive search program that combines, often in a complementary way, direct, indirect, and collider probes, has been however detected so far. This situation might change in the near future with the advent of even larger, multi-ton Direct Detection experiments. We provide here an updated review of the WIMP paradigm, with a focus on selected models that can be probed with upcoming facilities, all relying on the standard freeze-out paradigm for the relic density. We also discuss Collider and Indirect Searches when they provide complementary experimental information.
description: 79 pages, 43 figures. Invited review for European Physical Journal C
Redshift drift in uniformly accelerated reference frame
Creators: name: Chang, Zhe
name: Zhu, Qing-Hua
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We construct an alternative uniformly accelerated reference frame based on the 3+1 formalism in adapted coordinates. In this frame, time-dependent redshift drift exists between co-moving observers, which differs from that in Rindler coordinates. This phenomenon can be tested in laboratory and improve our understanding of non-inertial frames.
description: v1: 28 pages, 4 figures; v2: 29 pages, 4 figures. Published in Chinese Physics C
Pairwise velocity dispersion of galaxies at high redshift: theoretical predictions
Creators: name: Zhao, D. H.
name: Jing, Y. P.
name: Boerner, G.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the feasibility of determining the pairwise velocity dispersion (PVD) for Lyman Break Galaxies (LBGs), and of using this quantity as a discriminator among theoretical models. We find that when the Two Point Correlation Function over the range of observable separations is fixed, different schemes of galaxy formation will lead to significant changes in PVD, while influence of different cosmogonies is invisible. Our test with mock samples shows furthermore that one can discriminate among such models already with currently available observational samples (if the measurement error of the redshift is negligible) which have a typical error of $80\kms$. The error will be reduced by a factor of 2 if the samples are increased four times. We also show that an erroneous assumption about the geometry of the universe and different infall models only slightly change the results. Therefore the PVD will become another promising statistic to test galaxy formation models with redshift samples of LBGs.
description: 29 pages, 12 figures, 1 tables. Accepted for publication in ApJ
Effects of post-deposition annealing on the structure and magnetization of PLD grown Yttrium Iron Garnet films
Creators: name: Kumar, Ravinder
name: Hossain, Z.
name: Budhani, R. C.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We report on the recrystallization of 200 nm thick as-grown Yttrium Iron Garnet (Y_3.4 Fe_4.6 O_12) films on (111) face of Gadolinium Gallium Garnet (GGG) single crystals by post-deposition annealing. Epitaxial conversion of the as-grown microcrystalline YIG films was seen after annealing at 800oC for more than 30 minutes both in ambient oxygen as well as in air. The as-grown oxygen annealed samples at 800oC for 60 minutes crystallize epitaxially and show excellent figure-of-merit for saturation magnetization (MS = 3.3 μB/f.u., comparable to bulk value) and coercivity (HC ~ 1.1 Oe). The ambient air annealing at 800oC with a very slow rate of cooling (2oC/min) results in a double layer structure with a thicker unstrained epitaxial top layer having the MS and HC of 2.9 μB/f.u. and 0.12 Oe respectively. The symmetric and asymmetric Reciprocal space maps of both the samples reveal a locking of the in-plane lattice of the film to the in-plane lattice of substrate, indicating a pseudomorphic growth. The residual stress calculated by sin^2 ψ technique is compressive in nature. The lower layer in air annealed sample is highly strained, whereas, the top layer has negligible compressive stress.
title: Strong Coupling Methods
Creators: name: Matthies, Hermann
name: Steindorf, Jan
Publisher: name: Institut für Wissenschaftliches Rechnen
Year: 2002
Subjects: subject: partitioned methods
subject: strong coupling
subject: block-Newton methods
subject: fluid-structure-interaction
subject: 510

description: We consider the procedure of computing the response of a coupled problem with a partitioned approach. Often we have existing procedures or even software to solve each sub-problem separately, and want to couple both. This setting seems to allow only the so-called weak coupling which is not sufficient for some problems. The so-called strong coupling --- a totally implicit formulation --- requires iteration in each time step. With the partitioned approach, one simple computational procedure is similar to a block-Gauss-Seidel iteration. We show why this approach may experience difficulties, and how they may be circumvented with block-Newton methods, still in the partitioned framework, by only using the solvers for the two sub-problems. We supply some examples from fluid-structure coupling.
description: Informatik-Berichte der Technischen Universität Braunschweig, vol. 2002-06
Hidden Anderson Localization in Disorder-Free Ising-Kondo Lattice
Creators: name: Yang, Wei-Wei
name: Zhang, Lan
name: Guo, Xue-Ming
name: Zhong, Yin
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Anderson localization (AL) phenomena usually exists in systems with random potential. However, disorder-free quantum many-body systems with local conservation can also exhibit AL or even many-body localization transition. In this work, we show that the AL phase exists in a modified Kondo lattice without external random potential. The density of state, inverse participation ratio and temperature-dependent resistance are computed by classical Monte Carlo simulation, which uncovers the AL phase from previously studied Fermi liquid and Mott insulator regime. The occurrence of AL roots from quenched disorder formed by conservative localized moments. Interestingly, a many-body wavefunction is found, which captures elements in all three paramagnetic phases and is used to compute their quantum entanglement. In light of these findings, we expect the disorder-free AL phenomena can exit in generic translation-invariant quantum many-body systems.
description: 9 pages, 9 figures, accepted by Chinese Physics B
title: Efficient Model Reduction in Non-linear Dynamics Using the Karhunen-Loève Expansion and Dual-Weighted-Residual Methods
Creators: name: Meyer, Marcus
name: Matthies, Hermann
Publisher: name: Institut für Wissenschaftliches Rechnen
Year: 2003
Subjects: subject: model reduction
subject: non-linear dynamics
subject: Karhunen-Loève expansion
subject: error estimates
subject: dual-weighted-residual-methods
subject: 510

description: We look at the task of computing the time-evolution of a non-linear system for a long time, in our case under random external influences. Our specific example is the fatigue evaluation of a wind turbine. To facilitate such a computation, we look at a reduction of the computational effort by projecting everything on a low-dimensional basis. In this case we take the Karhunen-Loève basis generated from running the model a little while under the random loading. It is important that we error which is caused by this reduction process can be controlled. We estimate the error by dual or adjoint methods. This in turn allows the process of model reduction to be performed adaptively.
description: Informatik-Berichte der Technischen Universität Braunschweig, vol. 2003-01
A class of non-symmetric solutions for the integrability condition of the Knizhnik-Zamolodchikov equation: a Hopf algebra approach
Creators: name: Militaru, Gigel
Publisher: name: arXiv
Year: 1998
Subjects: subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: This paper studied what shall be called the Long equation: that is the system of nonlinear equation $R^{12}R^{13}=R^{13}R^{12}$ and $R^{12}R^{23}= R^{23}R^{12}$. Any solution of this system supplies us a solution for the integrability solution of Knizhnic-Zamolodchikov equation. We shall approach this equation by introducing a new class of bialgebras, which we call Long bialgebras. A FRT type theorem is given: in the finite case any solution of the above equation is a co-homotety where the vector spase is a comodule over a Long bialgebra.
description: 16 pg. Latex2e