cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Semi-Flatland
Creators: name: Vegh, David
name: McGreevy, John
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study perturbative compactifications of Type II string theory that rely on a fibration structure of the extra dimensions a la SYZ. Non-geometric spaces are obtained by using T-dualities as monodromies. These vacua generically preserve N=1 supersymmetry in four dimensions, and are U-dual to M-theory on G2 manifolds. Several examples are discussed, some of which admit an asymmetric orbifold description. The massless spectrum is matched to that of the dual M-theory compactification on a Joyce manifold when a comparison is possible. We explore the possibility of twisted reductions where left-moving spacetime fermion number Wilson lines are turned on in the fiber. We also give an explanation from this semiflat viewpoint for the Hanany-Witten brane-creation effect and for the equivalence of the Type IIA orientifold on T5/Z2 and Type IIB on S1 x K3.
description: 80 pages, 38 figures
A finiteness theorem for dual graphs of surface singularities
Creators: name: Popescu-Pampu, Patrick
name: Seade, Jose
Publisher: name: arXiv
Year: 2008
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14B05, 32S25, 32S45

description: Consider a fixed connected, finite graph $Γ$ and equip its vertices with weights $p_i$ which are non-negative integers. We show that there is a finite number of possibilities for the coefficients of the canonical cycle of a numerically Gorenstein surface singularity having $Γ$ as the dual graph of the minimal resolution, the weights $p_i$ of the vertices being the arithmetic genera of the corresponding irreducible components. As a consequence we get that if $Γ$ is not a cycle, then there is a finite number of possibilities of self-intersection numbers which one can attach to the vertices which are of valency $\geq 2$, such that one gets the dual graph of the minimal resolution of a numerically Gorenstein surface singularity. Moreover, we describe precisely the situations when there exists an infinite number of possibilities for the self-intersections of the component corresponding to some fixed vertex of $Γ$.
description: 10 pages
Scattering Models for Ultracold Atoms
Creators: name: Braaten, Eric
name: Kusunoki, Masaoki
name: Zhang, Dongqing
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present a review of scattering models that can be used to describe the low-energy behavior of identical bosonic atoms. In the simplest models, the only degrees of freedom are atoms in the same spin state. More elaborate models have other degrees of freedom, such as atoms in other spin states or diatomic molecules. The parameters of the scattering models are specified by giving the S-wave phase shifts for scattering of atoms in the spin state of primary interest. The models are formulated as local quantum field theories and the renormalization of their coupling constants is determined. Some of the parameters can be constrained by renormalizability or by the absence of negative-norm states. The Green's functions that describe the evolution of two-atom states are determined analytically. They are used to determine the T-matrix elements for atom-atom scattering and the binding energies of diatomic molecules. The scattering models all exhibit universal behavior as the scattering length in a specific spin state becomes large.
description: 60 pages, 6 figures, minor corrections
ADVANTAGES AND DISADVANTAGES OF DISTANCE LEARNING
Creators: name: Kismetova, G.
name: Abdrasilova, N.
Publisher: name: Sciences of Europe
Year: 2021
Subjects: distance learning
forms of distance learning
web classes
chat classes
teleconferences.

description: Distance learning is seen as an alternative form of education in a difficult epidemiological situation, which has led to the separation of teachers and students. The distance education system has become extremely popular due to its convenience and flexibility. The article presents the main forms of distance learning in secondary school, highlights the most popular and well-organized platforms for their implementation, shows the advantages and disadvantages of distance learning, highlights the problems on which are worth paying attention to when switching to distance education
Engineered quantum tunnelling in extended periodic potentials
Creators: name: Wimberger, Sandro
name: Ciampini, Donatella
name: Morsch, Oliver
name: Mannella, Riccardo
name: Arimondo, Ennio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Quantum tunnelling from a tilted, but otherwise periodic potential is studied. Our theoretical and experimental results show that, by controlling the system's parameters, we can engineer the escape rate of a Bose-Einstein condensate to an exceptional degree. Possible applications of this atom-optics realization of the open Wannier-Stark system are discussed.
description: 6 pp, proceedings DICE 11-15 September 2006, Castello di Piombino, Tuscany, Italy
Improved SAT models for NFA learning
Creators: name: Lardeux, Frédéric
name: Monfroy, Eric
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Grammatical inference is concerned with the study of algorithms for learning automata and grammars from words. We focus on learning Nondeterministic Finite Automaton of size k from samples of words. To this end, we formulate the problem as a SAT model. The generated SAT instances being enormous, we propose some model improvements, both in terms of the number of variables, the number of clauses, and clauses size. These improvements significantly reduce the instances, but at the cost of longer generation time. We thus try to balance instance size vs. generation and solving time. We also achieved some experimental comparisons and we analyzed our various model improvements.
DEVELOPMENT OF ORAL SPEECH SKILLS IN ENGLISH LESSONS AT GENERAL EDUCATIONAL SCHOOL
Creators: name: Kulmagambetova, S.
name: Tolegen A.
Publisher: name: Sciences of Europe
Year: 2021
Subjects: oral speech
communicative competence
interactive methods
pedagogical technologies
roleplaying game
creative activity.

description: The article describes the methods of activating oral speech, describes effective means of forming oral and speech skills, and in particular, speaking skills of pupils. A set of interesting techniques aimed at the formation of oral speech skills of general educational school pupils in English lessons is given.
Exploring Gradient Flow Based Saliency for DNN Model Compression
Creators: name: Liu, Xinyu
name: Li, Baopu
name: Chen, Zhen
name: Yuan, Yixuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Model pruning aims to reduce the deep neural network (DNN) model size or computational overhead. Traditional model pruning methods such as l-1 pruning that evaluates the channel significance for DNN pay too much attention to the local analysis of each channel and make use of the magnitude of the entire feature while ignoring its relevance to the batch normalization (BN) and ReLU layer after each convolutional operation. To overcome these problems, we propose a new model pruning method from a new perspective of gradient flow in this paper. Specifically, we first theoretically analyze the channel's influence based on Taylor expansion by integrating the effects of BN layer and ReLU activation function. Then, the incorporation of the first-order Talyor polynomial of the scaling parameter and the shifting parameter in the BN layer is suggested to effectively indicate the significance of a channel in a DNN. Comprehensive experiments on both image classification and image denoising tasks demonstrate the superiority of the proposed novel theory and scheme. Code is available at https://github.com/CityU-AIM-Group/GFBS.
description: ACM Multimedia 2021 (ACM MM'21)
Machine learning and the identification of Smart Specialisation thematic networks in Arctic Scandinavia
Creators: name: Mikko, Moilanen
name: Stein, Østbye
name: Jaakko, Simonen
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: Information Systems not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences

description: The European Union (EU) has recognized that universities and research institutes play a critical role in regional Smart Specialisation processes. Our research aims to identify thematic cross-border research domains across space and disciplines in Arctic Scandinavia. We identify potential domains using an unsupervised machine-learning technique (topic modelling). We uncover latent topics based on similarities in the vocabulary of research papers. The proposed methodology can be utilized to identify common research domains across regions and disciplines in almost real time, thereby acting as a decision support system to facilitate cooperation among knowledge producers.
THE MALMQUIST PRODUCTIVITY INDEX AND ITS ANALYSIS ON THE EXAMPLE OF THE RA
Creators: name: Avagyan, G.
name: Vardanyan, Q.
name: Petrosyan, G.
name: Navasardyan, M.
name: Margaryan, A.
Publisher: name: Sciences of Europe
Year: 2021
Subjects: competitiveness
Malmquist index
total factor productivity
technical efficiency
scale efficiency

description: One of the pillars of assessing the competitiveness of the country's economy is the degree of efficiency of its output, which mostly depends on the productivity of factors used in the production process, as well as on the effectiveness of production, organization and control. The professional literature has repeatedly referred to the evaluation of competitiveness and effectiveness. In this context, the Malmquist index is one of the most commonly used and comprehensive indicators for measuring productivity and efficiency. The contribution of this paper is the Malmquist index application in calculation of gross domestic production efficiency for a group of more than hundred countries, which will let us to reveal the trends in the dynamics of the country's competitiveness. Besides, that will help to identify the underlying issues that hinder the economic productivity of the observing country, in particular, the Republic of Armenia, and, consequently, its competitiveness. The explorations showed that the index in the context of economic efficiency is capable of detecting competitive advantage and disadvantage of any decision-making unit over other ones: in the RA they are pure efficiency change and scale efficiency change accordingly. Besides, the results indicated oscillatory nature of Armenia GDP efficiency change of production process and stable nature of production frontier shift.
Economic modelling to evaluate Smart Specialisation: an analysis of research and innovation targets in Southern Europe
Creators: name: Barbero, Javier
name: Diukanova, Olga
name: Gianelle, Carlo
name: Salotti, Simone
name: Santoalha, Artur
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Computational Biology

description: We make the case for a technology-enabled approach to Smart Specialisation policymaking aimed at increasing its effectiveness by assessing the general equilibrium effects of the European Cohesion Policy objectives contained in the regional Operational Programmes prepared by the regional policymakers. We simulate the impact of achieving the research and development personnel targets on gross domestic product and its components in a set of Southern European regions. We discuss the implications and challenges of the proposed methodology for future assessments of Smart Specialisation and for its implementation in the regions of the European Union.
Mysteries of the trade? Skill-specific local agglomeration economies
Creators: name: Andersson, Martin
name: Larsson, Johan P.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Evolutionary Biology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences

description: Do workers benefit from proximity to other workers with similar skill sets? This question dates back at least to Alfred Marshall. We use occupation groups to proxy skill sets and show that the answer likely depends on geographical levels, as well on regional hierarchy. Using longitudinal Swedish data, we document robust evidence consistent with highly localized spillovers at the level of sub-city districts between individuals in similar occupations. We further demonstrate less distance-sensitive benefits of working in districts and regions, characterized by high overall density (of employees in other occupations). We find no evidence of benefits from overall density outside Sweden’s three main metropolitan areas.
Superhorizon Perturbations and the Cosmic Microwave Background
Creators: name: Erickcek, Adrienne L.
name: Carroll, Sean M.
name: Kamionkowski, Marc
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Superhorizon perturbations induce large-scale temperature anisotropies in the cosmic microwave background (CMB) via the Grishchuk-Zel'dovich effect. We analyze the CMB temperature anisotropies generated by a single-mode adiabatic superhorizon perturbation. We show that an adiabatic superhorizon perturbation in a LCDM universe does not generate a CMB temperature dipole, and we derive constraints to the amplitude and wavelength of a superhorizon potential perturbation from measurements of the CMB quadrupole and octupole. We also consider constraints to a superhorizon fluctuation in the curvaton field, which was recently proposed as a source of the hemispherical power asymmetry in the CMB.
description: 11 pages, 4 figures, submitted to PRD
Industrial waste, green taxes and environmental policies in a regional perspective
Creators: name: Vallés-Giménez, Jaime
name: Zárate-Marco, Anabel
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences

description: This paper analyses the effectiveness of regional governments’ environmental taxes and policies in reducing industrial waste. We propose a spatial and dynamic model for the Spanish regions during the period 1999–2017. The results suggest that there are spatial and dynamic components in the generation of industrial waste; and that the specific environmental tax policy applied to industrial waste is not very effective, although the induced effect of these taxes and other environmental policies reduces the waste generation. Our model also suggests a relative decoupling between growth and waste, although many regions are still far from the waste Kuznets curve (WKC) turning point.
Predicting quantum dynamical cost landscapes with deep learning
Creators: name: Dalgaard, Mogens
name: Motzoi, Felix
name: Sherson, Jacob
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: State-of-the-art quantum algorithms routinely tune dynamically parametrized cost functionals for combinatorics, machine learning, equation-solving, or energy minimization. However, large search complexity often demands many (noisy) quantum measurements, leading to the increasing use of classical probability models to estimate which areas in the cost functional landscape are of highest interest. Introducing deep learning based modelling of the landscape, we demonstrate an order of magnitude increases in accuracy and speed over state-of-the-art Bayesian methods. Moreover, once trained the deep neural network enables the extraction of information at a much faster rate than conventional numerical simulation. This allows for on-the-fly experimental optimizations and detailed classification of complexity and navigability throughout the phase diagram of the landscape.
description: 12 pages, 8 figures
Why Helium Can Escape Gravity A Logical Interpretation
Creators: name: passolungo, simone
Publisher: name: Zenodo
Year: 2025

description: In the context of the logical theory of gravity, helium represents a significant exception. Unlike most atoms that actively participate in the ordering structure of the gravitational field, helium shows a surprising ability to escape even the gravity of the Sun—one of the most powerful in the known universe. This document analyzes the unique properties of helium that allow it to bypass logical-gravitational alignment.
Stability and structure of atomic chains on Si(111)
Creators: name: Battaglia, Corsin
name: Aebi, Philipp
name: Erwin, Steven C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the stability and structure of self-assembled atomic chains on Si(111) induced by monovalent, divalent and trivalent adsorbates, using first-principles total-energy calculations and scanning tunneling microscopy. We find that only structures containing exclusively silicon honeycomb or silicon Seiwatz chains are thermodynamically stable, while mixed configurations, with both honeycomb and Seiwatz chains, may be kinetically stable. The stability and structure of these atomic chains can be understood using a surprisingly simple electron-counting rule.
Pion Form Factor in Chiral Limit of Hard-Wall AdS/QCD Model
Creators: name: Grigoryan, H. R.
name: Radyushkin, A. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We develop a formalism to calculate form factor and charge density distribution of pion in the chiral limit using the holographic dual model of QCD with hard-wall cutoff. We introduce two conjugate pion wave functions and present analytic expressions for these functions and for the pion form factor. They allow to relate such observables as the pion decay constant and the pion charge electric radius to the values of chiral condensate and hard-wall cutoff scale. The evolution of the pion form factor to large values of the momentum transfer is discussed, and results are compared to existing experimental data.
description: 21 page, 7 figures. Short comparison with NJL predictions for pion radius and new references added. To be published in Phys.Rev. D
Gauge Mediation in F-Theory GUT Models
Creators: name: Marsano, Joseph
name: Saulina, Natalia
name: Schafer-Nameki, Sakura
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a simple framework for gauge-mediated supersymmetry-breaking in local GUT models based on F-theory 7-branes and demonstrate that a mechanism for solving both the μand μ/B_μ problems emerges in a natural way. In particular, a straightforward coupling of the messengers to the Higgs sector leads to a geometry which not only provides us with an approximate U(1)_{PQ} symmetry that forbids the generation of μat the GUT scale, it also forces the SUSY-breaking spurion field to carry a nontrivial PQ charge. This connects the breaking of SUSY to the generation of μso that the same scale enters both. Moreover, the messenger sector naturally realizes the D3-instanton triggered Polonyi model of arXiv:0808.1286 so this scale is exponentially suppressed relative to M_{GUT}. The effective action at low scales is in fact precisely of the form of the "sweet spot supersymmetry" scenario studied by Ibe and Kitano in arXiv:0705.3686.
description: 34 pages, 4 figures; v4 revisions to section 6
Deep Joint Source-Channel Coding for Multi-Task Network
Creators: name: Wang, Mengyang
name: Zhang, Zhicong
name: Li, Jiahui
name: Ma, Mengyao
name: Fan, Xiaopeng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Multi-task learning (MTL) is an efficient way to improve the performance of related tasks by sharing knowledge. However, most existing MTL networks run on a single end and are not suitable for collaborative intelligence (CI) scenarios. In this work, we propose an MTL network with a deep joint source-channel coding (JSCC) framework, which allows operating under CI scenarios. We first propose a feature fusion based MTL network (FFMNet) for joint object detection and semantic segmentation. Compared with other MTL networks, FFMNet gets higher performance with fewer parameters. Then FFMNet is split into two parts, which run on a mobile device and an edge server respectively. The feature generated by the mobile device is transmitted through the wireless channel to the edge server. To reduce the transmission overhead of the intermediate feature, a deep JSCC network is designed. By combining two networks together, the whole model achieves 512x compression for the intermediate feature and a performance loss within 2% on both tasks. At last, by training with noise, the FFMNet with JSCC is robust to various channel conditions and outperforms the separate source and channel coding scheme.
description: Accpeted by IEEE Signal Processing Letters
Practical recipes for the model order reduction, dynamical simulation, and compressive sampling of large-scale open quantum systems
Creators: name: Sidles, John A.
name: Garbini, Joseph L.
name: Harrell, Lee E.
name: Hero, Alfred O.
name: Jacky, Jonathan P.
name: Malcomb, Joseph R.
name: Norman, Anthony G.
name: Williamson, Austin M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This article presents numerical recipes for simulating high-temperature and non-equilibrium quantum spin systems that are continuously measured and controlled. The notion of a spin system is broadly conceived, in order to encompass macroscopic test masses as the limiting case of large-j spins. The simulation technique has three stages: first the deliberate introduction of noise into the simulation, then the conversion of that noise into an equivalent continuous measurement and control process, and finally, projection of the trajectory onto a state-space manifold having reduced dimensionality and possessing a Kahler potential of multi-linear form. The resulting simulation formalism is used to construct a positive P-representation for the thermal density matrix. Single-spin detection by magnetic resonance force microscopy (MRFM) is simulated, and the data statistics are shown to be those of a random telegraph signal with additive white noise. Larger-scale spin-dust models are simulated, having no spatial symmetry and no spatial ordering; the high-fidelity projection of numerically computed quantum trajectories onto low-dimensionality Kahler state-space manifolds is demonstrated. The reconstruction of quantum trajectories from sparse random projections is demonstrated, the onset of Donoho-Stodden breakdown at the Candes-Tao sparsity limit is observed, a deterministic construction for sampling matrices is given, and methods for quantum state optimization by Dantzig selection are given.
description: 104 pages, 13 figures, 2 tables
Neutrino-Induced Gamma-Ray Emission from Supernovae
Creators: name: Lu, Yu
name: Qian, Yong-Zhong
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: During a core-collapse supernova, absorption of anti-nu_e emitted from the proto-neutron star by protons in the hydrogen envelope produces neutrons and positrons. Neutron capture on protons and positron annihilation then produce gamma rays of 2.22 and 0.511 MeV, respectively. We calculate the fluxes of these gamma rays expected from a supernova with an 11 M_sun progenitor. The flux from neutron capture on protons exponentially decays on a timescale of 564 s, which is determined by neutron decay and capture on protons and 3He nuclei. The peak flux is 2.38x10^{-7}/cm^2/s for a supernova at a distance of 1 kpc. In contrast, the gamma-ray flux from positron annihilation follows the time evolution of the anti-nu_e luminosity and lasts for ~10 s. The peak flux in this case is 6.8x10^{-5}/cm^2/s for a supernova at a distance of 1 kpc. Detection of the above gamma-ray fluxes is beyond the capability of current instruments, and perhaps even those planned for the near future. However, if such fluxes can be detected, they not only constitute a new kind of signals that occur during the gap of several hours between the neutrino signals and the optical display of a supernova, but may also provide a useful probe of the conditions in the surface layers of the supernova progenitor.
description: 28 pages, 9 figures, submitted to Physical Review D
Circles-in-the-sky searches and observable cosmic topology in the inflationary limit
Creators: name: Mota, B.
name: Reboucas, M. J.
name: Tavakol, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: While the topology of the Universe is at present not specified by any known fundamental theory, it may in principle be determined through observations. In particular, a non-trivial topology will generate pairs of matching circles of temperature fluctuations in maps of the cosmic microwave background, the so-called circles-in-the-sky. A general search for such pairs of circles would be extremely costly and would therefore need to be confined to restricted parameter ranges. To draw quantitative conclusions from the negative results of such partial searches for the existence of circles we need a concrete theoretical framework. Here we provide such a framework by obtaining constraints on the angular parameters of these circles as a function of cosmological density parameters and the observer's position. As an example of the application of our results, we consider the recent search restricted to pairs of nearly back-to-back circles with negative results. We show that assuming the Universe to be very nearly flat, with its total matter-energy density satisfying the bounds $ 0
description: 8 pages, 4 figures. V2: Version to appear in Phys. Rev. D (2008), typos corrected, references added
STRATEGIES TO PREVENT DRUG ABUSE AMONG PRIMARY SCHOOL STUDENTS
Creators: name: Jirapa Siriwatanamethanon
name: Khanitta Nuntaboot
name: Supatra Buatee
name: Supaporn Aryamuang
name: Jolyon L. A. Dodgson
Publisher: name: Behavioral Science Research Institute,SWU.
Year: 2012
Subjects: drug abuse,prevention,knowledge,attitude,practice,primary school students

description: 1, 7, INTERNATIONAL JOURNAL OF BEHAVIORAL SCIENCE
ปัจจัยที่สัมพันธ์กับพฤติกรรมการขาดคุณธรรมความซื่อสัตย์ในการเรียนของนักศึกษา
Creators: name: ทรงสิริ วิชิรานนท์
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2010
Subjects: คุณธรรม, ความซื่อสัตย์ในการเรียน

description: 2, 4, วารสารวิชาการและวิจัย มทร.พระนคร
Anthropics and Myopics: Conditional Probabilities and the Cosmological Constant
Creators: name: Maor, Irit
name: Krauss, Lawrence
name: Starkman, Glenn
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We re-examine claims that anthropic arguments provide an explanation for the observed smallness of the cosmological constant, and argue that correlations between the cosmological constant value and the existence of life can be demonstrated only under restrictive assumptions. Causal effects are more subtle to uncover.
description: revised to PRL format, additional references and discussion to related work revised
การตรวจ enterotoxigenic Escherichia coli ที่ก่อโรคอุจจาระร่วงในลูกสุกรด้วยวิธี polymerase chain reaction (Detection of  Enterotoxigenic  Escherichia coli  in  Diarrheal  Piglets by  Polymerase
Chain Reaction)
Creators: name: รัตนา ภาชนนท์
Publisher: name: Genetics Society of Thailand
Year: 2013
Subjects: enterotoxigenic Escherichia coli, piglet, PCR

description: S1 (Special Issue 1), S.1, Thai Journal of Genetics
Systematic Analysis of Frustration Effects in Anisotropic Checkerboard Lattice Hubbard Model
Creators: name: Yoshioka, Takuya
name: Koga, Akihisa
name: Kawakami, Norio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the ground state properties of the geometrically frustrated Hubbard model on the anisotropic checkerboard lattice with nearest-neighbor hopping $t$ and next nearest-neighbor hopping $t'$. By using the path-integral renormalization group method, we study the phase diagram in the parameter space of the Hubbard interaction $U$ and the frustration-control parameter $t'/t$. Close examinations of the effective hopping, the double occupancy, the momentum distribution and the spin/charge correlation functions allow us to determine the phase diagram at zero temperature, where the plaquette-singlet insulator emerges besides the antiferromagnetic insulator and the paramagnetic metal. Spin-liquid insulating states without any kind of symmetry breaking cannot be found in our frustrated model.
description: 7pages, 5figures
Financial equilibria in the semimartingale setting: complete markets and markets with withdrawal constraints
Creators: name: Zitkovic, Gordan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Pricing of Securities (q-fin.PR)
subject: Optimization and Control (math.OC)
subject: Probability (math.PR)
subject: FOS: Economics and business
subject: FOS: Mathematics
subject: 91B70, 60G07

description: Existence of stochastic financial equilibria giving rise to semimartingale asset prices is established under a general class of assumptions. These equilibria are expressed in real terms and span complete markets or markets with withdrawal constraints.We deal with random endowment density streams which admit jumps and general time-dependent utility functions on which only regularity conditions are imposed. As an integral part of the proof of the main result, we establish a novel characterization of semimartingale functions.
Center Vortices and the Dirac Spectrum
Creators: name: Faber, Manfried
name: Greensite, Jeff
name: Heller, Urs M.
name: Höllwieser, Roman
name: Olejník, Štefan
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study correlations between center vortices and the low-lying eigenmodes of the Dirac operator, in both the overlap and asqtad formulations. In particular we address a puzzle raised some years ago by Gattnar et al. [Nucl. Phys. B 716, 105 (2005)], who noted that the low-lying Dirac eigenmodes required for chiral symmetry breaking do not appear to be present in center-projected configurations. We show that the low-lying modes are in fact present in the staggered (asqtad) formulation, but not in the overlap and ``chirally improved'' formulations, and suggest a reason for this difference. We also confirm and extend the results of Kovalenko et al. [Phys. Lett. B 648, 383 (2007)], showing that there is a correlation between center vortex locations, and the scalar density of low-lying Dirac eigenmodes derived from unprojected configurations. This correlation is strongest at points which are associated, in the vortex picture, with non-vanishing topological charge density, such as vortex intersection and ``writhing'' points. We present supporting evidence that the lowest Dirac eigenmodes, in both asqtad and overlap formulations, have their largest concentrations in point-like regions, rather than on submanifolds of higher dimensionality.
description: some high temperature results and references added
Gender Systematics in the NRAO Proposal Review System
Creators: name: Hunt, Gareth
name: Schwab, Frederic R.
name: Henning, P. A.
name: Balser, Dana S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Several recent investigations indicate the existence of gender-related systematic trends in the peer review of proposals for observations on astronomical facilities. This includes the National Radio Astronomy Observatory (NRAO) where there is evidence of a gender imbalance in the rank of proposals with male principal investigators (PIs) favored over female PIs. Since semester 2017A (17A), the NRAO has taken the following steps: (1) inform science review panels (SRPs) and the telescope time allocation committee (TAC) about the gender imbalance; and (2) increase the female representation on SRPs and the TAC to reflect the community demographics. Here we analyze SRP normalized rank-ordered scores, or linear ranks, by PI gender for NRAO observing proposals from semesters 12A-21A. We use bootstrap resampling to generate modeled distributions and the Anderson-Darling (AD) test to evaluate the probability that the linear rank distributions for male and female PIs are drawn from the same parent sample. We find that between semesters 12A-17A that male PIs are favored over female PIs (AD p-value 0.0084), whereas between semesters 17B-21A female PIs are favored over male PIs, but at a lower significance (AD p-value 0.11). Therefore the gender imbalance is currently being ameliorated, but this imbalance may have been reversed. Regardless, we plan to adopt a dual-anonymous approach to proposal review to reduce the possibility of bias to occur.
description: Accepted for publication in the PASP
The Evolution of Late-Time Optical Emission From SN 1979C
Creators: name: Milisavljevic, D.
name: Fesen, R.
name: Kirshner, R.
name: Challis, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Optical spectra of the bright Type II-L supernova SN 1979C obtained in April 2008 with the 6.5 m MMT telescope are compared with archival late-time spectra to follow the evolution of its optical emission over the age range of 11 to 29 years. We estimate an Halpha flux decrease of around 35% from 1993 to 2008 but noticeable increases in the strength of blueshifted emission of forbidden oxygen lines. While the maximum expansion of the broad ~6700 km/s Halpha emission appears largely unchanged from 1993, we find a significant narrowing of the double-peaked emission profiles in the [O I] 6300, 6364 and [O II] 7319, 7330 lines. A comparison of late-time optical spectra of a few other Type II supernovae which, like SN 1979C, exhibit bright late-time X-ray, optical, and radio emissions, suggests that blueshifted double-peaked oxygen emission profiles may be a common phenomenon. Finally, detection of a faint, broad emission bump centered around 5800 Angstroms suggests the presence of WC type Wolf-Rayet stars in the supernova's host star cluster.
description: 6 pages, 4 figures, 1 table. Matches version accepted by ApJ
A convective model for poro-elastodynamics with damage and fluid flow towards Earth lithosphere modelling
Creators: name: Roubíček, Tomáš
name: Tomassetti, Giuseppe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Devised towards geophysical applications for various processes in the lithosphere or the crust, a model of poro-elastodynamics with inelastic strains and other internal variables like damage (aging) and porosity as well as with diffusion of water is formulated fully in the Eulerian setting. Concepts of gradient of the total strain rate as well as the additive splitting of the total strain rate are used while eliminating the displacement from the formulation. It relies on that the elastic strain is small while only the inelastic and the total strains can be large. The energetics behind this model is derived and used for analysis as far as the existence of global weak energy-conserving solutions concerns. By this way, the model in [V. Lyakhovsky et al., Pure Appl. Geophys., 171:3099-3123, 2014] and [V. Lyakhovsky et al., Izvestiya, Physics of the Solid Earth, 43:13-23, 2007] is completed to make it mechanically consistent and amenable for analysis.
Probabilistic Drag-Based Ensemble Model (DBEM) Evaluation for Heliospheric Propagation of CMEs
Creators: name: Čalogović, Jaša
name: Dumbović, Mateja
name: Sudar, Davor
name: Vršnak, Bojan
name: Martinić, Karmen
name: Temmer, Manuela
name: Veronig, Astrid
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The Drag-based Model (DBM) is a 2D analytical model for heliospheric propagation of Coronal Mass Ejections (CMEs) in ecliptic plane predicting the CME arrival time and speed at Earth or any other given target in the solar system. It is based on the equation of motion and depends on initial CME parameters, background solar wind speed, $w$ and the drag parameter $γ$. A very short computational time of DBM ($
The Nature of Generic Cosmological Singularities
Creators: name: Uggla, Claes
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The existence of a singularity by definition implies a preferred scale--the affine parameter distance from/to the singularity of a causal geodesic that is used to define it. However, this variable scale is also captured by the expansion along the geodesic, and this can be used to obtain a regularized state space picture by means of a conformal transformation that factors out the expansion. This leads to the conformal `Hubble-normalized' orthonormal frame approach which allows one to translate methods and results concerning spatially homogeneous models into the generic inhomogeneous context, which in turn enables one to derive the dynamical nature of generic cosmological singularities. Here we describe this approach and outline the derivation of the `cosmological billiard attractor,' which describes the generic dynamical asymptotic behavior towards a generic spacelike singularity. We also compare the `dynamical systems picture' resulting from this approach with other work on generic spacelike singularities: the metric approach of Belinskii, Lifschitz, and Khalatnikov, and the recent Iwasawa based Hamiltonian method used by Damour, Henneaux, and Nicolai; in particular we show that the cosmological billiards obtained by the latter and the cosmological billiard attractor form complementary `dual' descriptions of the generic asymptotic dynamics of generic spacelike singularities.
description: 14 pages, six figures; invited talk at the 11th Marcel Grossmann Meeting on Recent Developments in General Relativity, Berlin, Germany, 23-29 July 2006
Higgs Bundles and Geometric Structures on Surfaces
Creators: name: Goldman, William M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M05, 20H10

description: This paper concerns the relationship between locally homogeneous geometric structures on topological surfaces and the moduli of polystable Higgs bundles on Riemann surfaces, due to Hitchin and Simpson. In particular we discuss the uniformization of Riemann surfaces by hyperbolic geometry from this viewpoint, and survey more recent developments in this theory.
description: 29 pages, To appear in "The Many Facets of Geometry: a Tribute to Nigel Hitchin," Bourgignon, Garcia-Prada & Salamon, eds, Oxford Univ. Press
Discovery of a Wide Substellar Companion to a Nearby Low-Mass Star
Creators: name: Radigan, Jacqueline
name: Lafrenière, David
name: Jayawardhana, Ray
name: Doyon, René
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a wide (135+/-25 AU), unusually blue L5 companion 2MASS J17114559+4028578 to the nearby M4.5 dwarf G 203-50 as a result of a targeted search for common proper motion pairs in the Sloan Digital Sky Survey and the Two Micron All Sky Survey. Adaptive Optics imaging with Subaru indicates that neither component is a nearly equal mass binary with separation > 0.18", and places limits on the existence of additional faint companions. An examination of TiO and CaH features in the primary's spectrum is consistent with solar metallicity and provides no evidence that G 203-50 is metal poor. We estimate an age for the primary of 1-5 Gyr based on activity. Assuming coevality of the companion, its age, gravity and metallicity can be constrained from properties of the primary, making it a suitable benchmark object for the calibration of evolutionary models and for determining the atmospheric properties of peculiar blue L dwarfs. The low total mass (M_tot=0.21+/-0.03 M_sun), intermediate mass ratio (q=0.45+/-0.14), and wide separation of this system demonstrate that the star formation process is capable of forming wide, weakly bound binary systems with low mass and BD components. Based on the sensitivity of our search we find that no more than 2.2% of early-to-mid M dwarfs (9.0 < M_V < 13.0) have wide substellar companions with m > 0.06 M_sun.
description: 24 pages, 5 figures, accepted for publication in ApJ
Virtual Sensor Based Fault Detection and Classification on a Plasma Etch Reactor
Creators: name: Sofge, D. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The SEMATECH sponsored J-88-E project teaming Texas Instruments with NeuroDyne (et al.) focused on Fault Detection and Classification (FDC) on a Lam 9600 aluminum plasma etch reactor, used in the process of semiconductor fabrication. Fault classification was accomplished by implementing a series of virtual sensor models which used data from real sensors (Lam Station sensors, Optical Emission Spectroscopy, and RF Monitoring) to predict recipe setpoints and wafer state characteristics. Fault detection and classification were performed by comparing predicted recipe and wafer state values with expected values. Models utilized include linear PLS, Polynomial PLS, and Neural Network PLS. Prediction of recipe setpoints based upon sensor data provides a capability for cross-checking that the machine is maintaining the desired setpoints. Wafer state characteristics such as Line Width Reduction and Remaining Oxide were estimated on-line using these same process sensors (Lam, OES, RFM). Wafer-to-wafer measurement of these characteristics in a production setting (where typically this information may be only sparsely available, if at all, after batch processing runs with numerous wafers have been completed) would provide important information to the operator that the process is or is not producing wafers within acceptable bounds of product quality. Production yield is increased, and correspondingly per unit cost is reduced, by providing the operator with the opportunity to adjust the process or machine before etching more wafers.
description: 7 pages
A Pedagogical Extension of the One Dimensional Schrödinger's Equation to Symmetric Proximity Effect System Film Sandwiches
Creators: name: Luke, B. J.
name: Broussard, P. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: This study sought to use Schrödigner's equation to model superconducting proximity effect systems of symmetric forms. As N. R. Werthamer noted, [Phys. Rev. \textbf{132} (6), 2441 (1963)] one to one analogies between the standard superconducting proximity effect equation and the one-dimensional, time-independent Schrödinger's equation can be made, thus allowing one to model the behavior of proximity effect systems of metallic film sandwiches by solving Schrödinger's equation. In this project, film systems were modeled by infinite square wells with simple potentials. Schrödinger's equation was solved for sandwiches of the form $S(NS)_M$ and $N(SN)_M$, where $S$ and $N$ represent superconducting and nonsuperconducting metal films, respectively, and $M$ is the number of repeated bilayers, or the period. A comparison of Neumann and Dirichlet boundary conditions was done in order to explore their effects. The Dirichlet type produced eigenvalues for $S(NS)_M$ and $N(SN)_M$ sandwiches that converged for increasing $M$, but the Neumann type produced eigenvalues for the same structures that approached two different limits as $M$ increased. This last behavior is unexpected, as it implies a dependence upon the type of film end layer.
description: 12 pages, 5 figures
Multi-functional 2D hybrid aerogels for gas absorption applications
Creators: name: Androulidakis, Charalampos
name: Kotsidi, Maria
name: Gorgolis, George
name: Pavlou, Christos
name: Sygellou, Labrini
name: Paterakis, George
name: Koutroumanis, Nick
name: Galiotis, Costas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Aerogels have attracted significant attention recently due to their ultra-light weight porous structure, mechanical robustness, high electrical conductivity, facile scalability and their use as gas and oil absorbers. Herein, we examine the multi-functional properties of hybrid aerogels consisting of reduced graphene oxide (rGO) integrated with hexagonal boron nitride (hBN) platelets. Using a freeze-drying approach, hybrid aerogels are fabricated by simple mixing with various volume fractions of hBN and rGO up to 0.5/0.5 ratio. The fabrication method is simple, cost effective, scalable and can be extended to other 2D materials combinations. The hybrid rGO/hBN aerogels (HAs) are mechanically robust and highly compressible with mechanical properties similar to those of the pure rGO aerogel. We show that the presence of hBN in the HAs enhances the gas absorption capacities of formaldehyde and water vapour up to ~7 and > 8 times, respectively, as compared to pure rGO aerogel. Moreover, the samples show good recoverability, making them highly efficient materials for gas absorption applications and for the protection of artefacts such as paintings in storage facilities. Finally, even in the presence of large quantity of insulating hBN, the HAs are electrically conductive, extending the potential application spectrum of the proposed hybrids to the field of electro-thermal actuators. The work proposed here paves the way for the design and production of novel 2D materials combinations with tailored multi-functionalities suited for a large variety of modern applications.