cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
การสร้างภาพลักษณ์ของโรงแรมผ่านแผนกบริการส่วนหน้า
Creators: name: ธนาภรณ์ ทัศนภักดิ์
name: ปฏิมาศ นิตยาชิต
Publisher: name: โรงพิมพ์มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2560
Subjects: การสร้างภาพลักษณ์
โรงแรม
แผนกบริการส่วนหน้า

description: วารสารวิชาการ คณะวิทยาการจัดการ, 2, 3, 65-73
Loop equations and topological recursion for the arbitrary-$β$ two-matrix model
Creators: name: Bergère, Michel
name: Eynard, Bertrand
name: Marchal, Olivier
name: Prats-Ferrer, Aleix
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We write the loop equations for the $β$ two-matrix model, and we propose a topological recursion algorithm to solve them, order by order in a small parameter. We find that to leading order, the spectral curve is a "quantum" spectral curve, i.e. it is given by a differential operator (instead of an algebraic equation for the hermitian case). Here, we study the case where that quantum spectral curve is completely degenerate, it satisfies a Bethe ansatz, and the spectral curve is the Baxter TQ relation.
description: 83 pages; JHEP 2012
Compression efficiency improvement for 2D and 3D video
Creators: name: Valizadeh, Sima
Publisher: name: University of British Columbia
Year: 2017

description: Advances in video compression technologies have resulted in high visual quality at constrained amounts of bitrate. This is crucial in video transmission and storage, considering the limited bandwidth of communication channels and storage media with limited capacities. In this thesis, we propose new methods for improving the compression efficiency of HEVC and its 3D extension for stereo and multiview video content. To achieve high video quality while keeping the bitrate within certain constraints, the characteristics of the human visual system (HVS) play an important role. The utilization of video quality metrics that are based on the human visual system and their integration within the video encoder can improve compression efficiency. We, therefore, propose to measure the distortion using a perceptual video quality metric (instead of sum of squared errors) inside the coding unit structure and for mode selection in the rate distortion optimization process of HEVC. Experiments show that our method improves HEVC compression efficiency by 10.21%. Next, we adjust the trade-off between the perceptual distortion and the bitrate based on the characteristics of the video content. The value of the Lagrange multiplier is estimated from the first frame for every scene in the video. Experimental results show that the proposed approach further improves the compression efficiency of HEVC (up to 2.62% with an average of 0.60%). Furthermore, we extend our work to address the HEVC extension for 3D video. First, we integrate the perceptual video quality in the rate distortion optimization process of stereo video coding where the dependencies between the two views are exploited to improve coding efficiency. Next, we extend our approach to multiview video coding for auto-stereoscopic displays (where 3D content can be viewed without using 3D glasses). In this case, two or three views and their corresponding depth maps need to be coded. Our proposed perceptual 3D video coding increases the compression efficiency of multi-view video coding by 2.78%. Finally, we show that compression efficiency of stereoscopic videos improves if we take advantage of asymmetric video coding. The proposed approach reduces the amount of bitrate required for transmitting stereoscopic video while maintaining the stereoscopic quality.
Symmetries in Fluctuations Far from Equilibrium
Creators: name: Hurtado, Pablo I.
name: Perez-Espigares, Carlos
name: del Pozo, Jesus J.
name: Garrido, Pedro L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Fluctuations arise universally in Nature as a reflection of the discrete microscopic world at the macroscopic level. Despite their apparent noisy origin, fluctuations encode fundamental aspects of the physics of the system at hand, crucial to understand irreversibility and nonequilibrium behavior. In order to sustain a given fluctuation, a system traverses a precise optimal path in phase space. Here we show that by demanding invariance of optimal paths under symmetry transformations, new and general fluctuation relations valid arbitrarily far from equilibrium are unveiled. This opens an unexplored route toward a deeper understanding of nonequilibrium physics by bringing symmetry principles to the realm of fluctuations. We illustrate this concept studying symmetries of the current distribution out of equilibrium. In particular we derive an isometric fluctuation relation which links in a strikingly simple manner the probabilities of any pair of isometric current fluctuations. This relation, which results from the time-reversibility of the dynamics, includes as a particular instance the Gallavotti-Cohen fluctuation theorem in this context but adds a completely new perspective on the high level of symmetry imposed by time-reversibility on the statistics of nonequilibrium fluctuations. The new symmetry implies remarkable hierarchies of equations for the current cumulants and the nonlinear response coefficients, going far beyond Onsager's reciprocity relations and Green-Kubo formulae. We confirm the validity of the new symmetry relation in extensive numerical simulations, and suggest that the idea of symmetry in fluctuations as invariance of optimal paths has far-reaching consequences in diverse fields.
description: 8 pages, 4 figures
title: Mapping the Treatment Gap: A mixed methods exploration of barriers to treatment-seeking for depression in rural India
Creators: name: Roberts, T
Publisher: name: London School of Hygiene & Tropical Medicine
Year: 2019

description: Background: Depression is a major contributor to the global burden of disease. However, only 1 in 4 of those affected in low- and middle-income countries (LMIC), and just 13% in India, seek treatment. This project investigated factors that impede treatment-seeking for depression. Methods: I undertook a global systematic review of factors associated with treatment-seeking for common mental disorders. I tested the association between travel distance to the nearest public mental health service and likelihood of seeking treatment for depression in rural India, and described treatment-seeking behaviour, using data from a population-based survey. Finally, I used qualitative methods to explore barriers to treatment-seeking for depression among affected individuals and their families. Results: Systematic review results showed that treatment-seeking is more consistently related to “need” factors, such as disability and chronicity, than “enabling” factors, such as income. However, evidence from LMIC was lacking. The hypothesised association between distance to services and treatment-seeking was not supported. Most adults with probable depression had some recent contact with health services, most often in the private sector, for reasons other than depression symptoms. Use of traditional services was low. Adults who were unmarried, had not discussed their depression symptoms, and had milder symptoms, were less likely to seek treatment for depression. Low demand for depression treatment arose because participants viewed depression symptoms as a response to their circumstances, not as medical issues. Conclusions: The burden of depression is unlikely to be reduced by decreasing travel distance to services without ensuring that interventions are aligned with local priorities. These priorities include action on the social determinants of health and improving the quality of general health care. Private practitioners must be considered in future research and service planning in India. The treatment gap does not adequately capture the needs of people with depression as they perceive them.
Heterogenous mean-field analysis of a generalized voter-like model on networks
Creators: name: Moretti, Paolo
name: Liu, Suyu
name: Baronchelli, Andrea
name: Pastor-Satorras, Romualdo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We propose a generalized framework for the study of voter models in complex networks at the the heterogeneous mean-field (HMF) level that (i) yields a unified picture for existing copy/invasion processes and (ii) allows for the introduction of further heterogeneity through degree-selectivity rules. In the context of the HMF approximation, our model is capable of providing straightforward estimates for central quantities such as the exit probability and the consensus/fixation time, based on the statistical properties of the complex network alone. The HMF approach has the advantage of being readily applicable also in those cases in which exact solutions are difficult to work out. Finally, the unified formalism allows one to understand previously proposed voter-like processes as simple limits of the generalized model.
Particle Acceleration in Kerr-(anti-) de Sitter Black Hole Backgrounds
Creators: name: Li, Yang
name: Yang, Jie
name: Li, Yun-Liang
name: Wei, Shao-Wen
name: Liu, Yu-Xiao
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently, Banãdos, Silk and West (BSW) found that the center-of-mass energy of two colliding test particles in the neighborhood of an extreme Kerr black hole could be arbitrarily high when one particle has the critical angular momentum $L_\text{C}$. In their paper, they considered the black holes living in a Minkowski space-time with a zero cosmological constant. In this work, we study this process of particles in the backgrounds of the Kerr black holes living in a space-time with a nonzero cosmological constant. We find that for kerr black holes living in a space-time with a negative cosmological constant (Kerr-anti-de Sitter black holes), this process of particles could happen only if the Kerr-anti-de Sitter black hole is extreme and an additional fine tuning is satisfied; while for kerr black holes living in a space-time with a positive cosmological constant (Kerr-de Sitter black holes), this process of particles could happen no matter the Kerr-de Sitter black hole is extreme or not. We also study the particle collision outside the outer horizon of the Kerr-(anti-) de Sitter black hole in some cases. We find that there is a possibility that we could tune one colliding particle's angular momentum to gain the large center-of-mass energy without increase the particle's energy.
description: 11 pages, 5 figures
Reconfigurable quantum metamaterials
Creators: name: Quach, James Q.
name: Su, Chun-Hsu
name: Martin, Andrew M.
name: Greentree, Andrew D.
name: Hollenberg, Lloyd C. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: By coupling controllable quantum systems into larger structures we introduce the concept of a quantum metamaterial. Conventional meta-materials represent one of the most important frontiers in optical design, with applications in diverse fields ranging from medicine to aerospace. Up until now however, metamaterials have themselves been classical structures and interact only with the classical properties of light. Here we describe a class of dynamic metamaterials, based on the quantum properties of coupled atom-cavity arrays, which are intrinsically lossless, reconfigurable, and operate fundamentally at the quantum level. We show how this new class of metamaterial could be used to create a reconfigurable quantum superlens possessing a negative index gradient for single photon imaging. With the inherent features of quantum superposition and entanglement of metamaterial properties, this new class of dynamic quantum metamaterial, opens a new vista for quantum science and technology.
description: 16 pages, 8 figures
Canonical extensions of Morita homomorphisms to the Ptolemy groupoid
Creators: name: Massuyeau, Gwenael
Publisher: name: arXiv
Year: 2010
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 57N05, 57N10, 20F34, 20F38, 20F40, 20J06, 20L05

description: Let S be a compact connected oriented surface with one boundary component. We extend each of Johnson's and Morita's homomorphisms to the Ptolemy groupoid of S. Our extensions are canonical and take values into finitely generated free abelian groups. The constructions are based on the 3-dimensional interpretation of the Ptolemy groupoid, and a chain map introduced by Suslin and Wodzicki to relate the homology of a nilpotent group to the homology of its Malcev Lie algebra.
description: 30 pages. Minor modifications in this third version
Mathematical background from Infection dynamics in ecosystems: on the interaction between red and grey squirrels, pox virus, pine martens and trees
Creators: name: Roberts, M.G.
name: Heesterbeek, J.A.P.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 10202 Biological Mathematics
subject: FOS: Mathematics

description: Calculation of steady states and stability.
Jet vetoing and Herwig++
Creators: name: Schofield, Alex
name: Seymour, Michael H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the simulation of events with gaps between jets with a veto on additional radiation in the gap in Herwig++. We discover that the currently-used random treatment of radiation in the parton shower is generating some unphysical behaviour for wide-angle gluon emission in QCD 2 to 2 scatterings. We explore this behaviour quantitatively by making the same assumptions as the parton shower in the analytical calculation. We then modify the parton shower algorithm in order to correct the simulation of QCD radiation.
description: 18 pages, 11 figures
Normal Form for the Schrödinger equation with analytic non--linearities
Creators: name: Procesi, M.
name: Procesi, C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Analysis of PDEs (math.AP)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: In this paper we discuss a class of normal forms of the completely resonant non--linear Schrödinger equation on a torus. We stress the geometric and combinatorial constructions arising from this study. Further analytic considerations and applications to quasi--periodic solutions will appear in a forthcoming article. This paper replaces a previous version correcting some mistakes.
description: 52 pages, 2 figures
Asymptotic optimality of the Westfall--Young permutation procedure for multiple testing under dependence
Creators: name: Meinshausen, Nicolai
name: Maathuis, Marloes H.
name: Bühlmann, Peter
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Test statistics are often strongly dependent in large-scale multiple testing applications. Most corrections for multiplicity are unduly conservative for correlated test statistics, resulting in a loss of power to detect true positives. We show that the Westfall--Young permutation method has asymptotically optimal power for a broad class of testing problems with a block-dependence and sparsity structure among the tests, when the number of tests tends to infinity.
description: Published in at http://dx.doi.org/10.1214/11-AOS946 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Synchrotron-based X-ray Fluorescence Ghost Imaging
Creators: name: Manni, Mathieu
name: Ben-Yehuda, Adi
name: Klein, Yishay
name: Lukic, Bratislav
name: Kingston, Andrew
name: Rack, Alexander
name: Shwartz, Sharon
name: Viganò, Nicola
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: X-ray Fluorescence Ghost Imaging (XRF-GI) was recently demonstrated for x-ray lab sources. It has the potential to reduce acquisition time and deposited dose by choosing their trade-off with spatial resolution, while alleviating the focusing constraints of the probing beam. Here, we demonstrate the realization of synchrotron-based XRF-GI: We present both an adapted experimental setup and its corresponding required computational technique to process the data. This extends the above-mentioned potential advantages of GI to synchrotron XRF imaging. In addition, it enables new strategies to improve resilience against drifts at all scales, and the study of previously inaccessible samples, such as liquids.
description: 4 pages, 5 figures
Faceted classification for museum artefacts: a methodology to support web site development of large cultural organizations
Creators: name: Menard, Elaine
name: Mas, Sabine
Publisher: name: Zenodo
Year: 2009
Subjects: subject: https://iskouk.org/subjects/BPEVJUGL
subject: https://iskouk.org/subjects/URTHVEAH
subject: https://iskouk.org/subjects/202AASH6

description: This research project aimed to provide a new visual representation of the Artefacts Canada digital
 collection, as well as a means for users to browse this content. Artefacts Canada Humanities is a
 database containing approximately 3.5 million records describing the different collections of
 Canadian museums.
Physics of Trans-Planckian Gravity
Creators: name: Dvali, Gia
name: Folkerts, Sarah
name: Germani, Cristiano
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the field theoretical description of a generic theory of gravity flowing to Einstein General Relativity in IR. We prove that, if ghost-free, in the weakly coupled regime such a theory can never become weaker than General Relativity. Using this fact, as a byproduct, we suggest that in a ghost-free theory of gravity trans-Planckian propagating quantum degrees of freedom cannot exist. The only physical meaning of a trans-Planckian pole is the one of a classical state (Black Hole) which is described by the light IR quantum degrees of freedom and gives exponentially-suppressed contributions to virtual processes. In this picture Einstein gravity is UV self-complete, although not Wilsonian, and sub-Planckian distances are unobservable in any healthy theory of gravity. We then finally show that this UV/IR correspondence puts a severe constraint on any attempt of conventional Wilsonian UV-completion of trans-Planckian gravity. Specifically, there is no well-defined energy domain in which gravity could become asymptotically weak or safe.
description: 23 pages, 4 figures, v2: Paper reorganized to improve clarity; additional explanations and references added; version accepted for publication in Phys. Rev. D
BPS invariants of N=4 gauge theory on a surface
Creators: name: Manschot, Jan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Generating functions of BPS invariants for N=4 U(r) gauge theory on a Hirzebruch surface with r=2 and 3 are computed. The BPS invariants provide the Betti numbers of moduli spaces of semi-stable sheaves. The generating functions for r=2 are expressed in terms of higher level Appell functions for a certain polarization of the surface. The level corresponds to the self-intersection of the base curve of the Hirzebruch surface. The non-holomorphic functions are determined, which added to the holomorphic generating functions provide functions which transform as a modular form.
description: 17 pages, 1 figure
Electronic structure of the $\rm Ca_3Co_4O_9$ compound from ab initio local interactions
Creators: name: Soret, Julien
name: Lepetit, Marie-Bernadette
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We used fully correlated ab initio calculations to determine the effective parameters of Hubbard and t - J models for the thermoelectric misfit compound $\rm Ca_3Co_4O_9$. As for the $\rm Na_xCoO_2$ family the Fermi level orbitals are the $a_{1g}$ orbitals of the cobalt atoms ; the $e'_g$ being always lower in energy by more than 240\,meV. The electron correlation is found very large $U/t\sim 26$ as well as the parameters fluctuations as a function of the structural modulation. The main consequences are a partial $a_{1g}$ electrons localization and a fluctuation of the in-plane magnetic exchange from AFM to FM. The behavior of the Seebeck coefficient as a function of temperature is discussed in view of the ab initio results, as well as the 496\,K phase transition.
Economic design in the virtual world : the fee structure and sales mechanism in the P2P trading market in online video games
Creators: name: Liang, Yitian
Publisher: name: University of British Columbia
Year: 2017

description: Massively multiplayer online games (MMOGs), often referred to as online video games —which enable players to interact with each other in a virtual world—generate significant and growing economic value. The predominant business model is free-to-play, in which collecting fees from in-game player-to-player (P2P) trading markets is an important way for firms to generate revenue. Surprisingly, quantitative research on the free-to-play business model in this industry is limited and, in particular, a thorough empirical investigation of the design of the P2P market is lacking. This thesis examines the fee structure, followed by an initial investigation of the sales mechanism. To understand the fee structure, we examine two commonly designs: listing fee (charged upfront) and commission (charged upon transaction). While it seems intuitive that listing fee—an entry cost—should lower the listing and transaction volumes (common industry indicators of long-run profitability) more than commission does, it is unclear which structure generates higher fee collection (short-run revenue). To answer this question, a structural model is developed to capture players’ trading behavior and applied to a popular game. The model is empirically challenging due to several industry features including a large number of long-lived players with unobserved heterogeneity. We tackle the challenge by assuming that players don't use their identities as information to form the sale probability, which is innocuous when each player’s impact on outcomes is small. We prove the existence of equilibrium, propose and implement a computationally light estimation procedure. Through counterfactuals, we find that there is a trade-off between them: listing fee (vs. commission) generates lower listing volume, similar transaction volume, and greater fee collection. We discuss the managerial implications. To better understand the sales mechanism, we compare fixed-price posting and auction. Due to data limitation (only fixed-price posting is observed), our goal is to develop a tractable auction framework (for estimation with actual auction data) and to conduct preliminary analysis. Using parameter estimates from the fixed-price posting data, our initial counterfactual shows that there is a trade-off: auction generates higher fee collection and listing volume, but lower transaction volume. We discuss the limitations and managerial implications.
Cellular automata models of clone expansion and competition from Simulations reveal that different responses to cell crowding determine the expansion of p53 and Notch mutant clones in squamous epithelia
Creators: name: Kostiou, Vasiliki
name: Hall, Michael WJ
name: Jones, Philip H.
name: Hall, Benjamin A.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 60114 Systems Biology
subject: FOS: Biological sciences
subject: Computational Biology

description: Models used in this document.
Effect of Magnetic Braking on the Circumstellar Disk Formation in a Strongly Magnetized Cloud
Creators: name: Machida, Masahiro N.
name: Inutsuka, Shu-ichiro
name: Matsumoto, Tomoaki
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using resistive magnetohydrodynamics simulation, we investigate circumstellar disk formation in a strongly magnetized cloud. As the initial state, an isolated cloud core embedded in a low-density interstellar medium with a uniform magnetic field is adopted. The cloud evolution is calculated until almost all gas inside the initial cloud falls onto either the circumstellar disk or a protostar, and a part of the gas is ejected into the interstellar medium by the protostellar outflow driven by the circumstellar disk. In the early main accretion phase, the disk size is limited to \sim 10 AU because the angular momentum of the circumstellar disk is effectively transferred by both magnetic braking and the protostellar outflow. In the later main accretion phase, however, the circumstellar disk grows rapidly and exceeds 100 AU by the end of the main accretion phase. This rapid growth of the circumstellar disk is caused by the depletion of the infalling envelope, while magnetic braking is effective when the infalling envelope is more massive than the circumstellar disk. The infalling envelope cannot brake the circumstellar disk when the latter is more massive than the former. In addition, the protostellar outflow weakens and disappears in the later main accretion phase, because the outflow is powered by gas accretion onto the circumstellar disk. Although the circumstellar disk formed in a magnetized cloud is considerably smaller than that in an unmagnetized cloud, a circumstellar disk exceeding 100 AU can form even in a strongly magnetized cloud.
description: 39 pages, 13 figures, accepted for publication in PASJ. For high resolution figures see http://www2-tap.scphys.kyoto-u.ac.jp/~machidam/astro-ph/Magbraking.pdf
Visualizing Geophylogenies -- Internal and External Labeling with Phylogenetic Tree Constraints
Creators: name: Klawitter, Jonathan
name: Klesen, Felix
name: Scholl, Joris Y.
name: van Dijk, Thomas C.
name: Zaft, Alexander
Publisher: name: arXiv
Year: 2023
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Computational Complexity (cs.CC)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 68R10, 92D15

description: A geophylogeny is a phylogenetic tree (or dendrogram) where each leaf (e.g. biological taxon) has an associated geographic location (site). To clearly visualize a geophylogeny, the tree is typically represented as a crossing-free drawing next to a map. The correspondence between the taxa and the sites is either shown with matching labels on the map (internal labeling) or with leaders that connect each site to the corresponding leaf of the tree (external labeling). In both cases, a good order of the leaves is paramount for understanding the association between sites and taxa. We define several quality measures for internal labeling and give an efficient algorithm for optimizing them. In contrast, minimizing the number of leader crossings in an external labeling is NP-hard. On the positive side, we show that crossing-free instances can be solved in polynomial time and give a fixed-parameter tractable (FPT) algorithm. Furthermore, optimal solutions can be found in a matter of seconds on realistic instances using integer linear programming. Finally, we provide several efficient heuristic algorithms and experimentally show them to be near optimal on real-world and synthetic instances.
description: A preliminary version of this paper appeared in the proceedings of the 12th International Conference on Geographic Information Science (GIScience 2023)
Loop subgroups of F_r and the image of their stabilizer subgroups in GL_r(Z)
Creators: name: Breitner, Joachim
Publisher: name: arXiv
Year: 2010
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20E36

description: For a representative class of subgroups of F_r, the image of their stabilizer subgroup under the action of Aut(F_r) in GL_r(Z) is calculated.
description: 12 pages, 1 figure
An effective theory for jet propagation in dense QCD matter: jet broadening and medium-induced bremsstrahlung
Creators: name: Ovanesyan, Grigory
name: Vitev, Ivan
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Two effects, jet broadening and gluon bremsstrahlung induced by the propagation of a highly energetic quark in dense QCD matter, are reconsidered from effective theory point of view. We modify the standard Soft Collinear Effective Theory (SCET) Lagrangian to include Glauber modes, which are needed to implement the interactions between the medium and the collinear fields. We derive the Feynman rules for this Lagrangian and show that it is invariant under soft and collinear gauge transformations. We find that the newly constructed theory SCET$_{\rm G}$ recovers exactly the general result for the transverse momentum broadening of jets. In the limit where the radiated gluons are significantly less energetic than the parent quark, we obtain a jet energy-loss kernel identical to the one discussed in the reaction operator approach to parton propagation in matter. In the framework of SCET$_{\rm G}$ we present results for the fully-differential bremsstrahlung spectrum for both the incoherent and the Landau-Pomeranchunk-Migdal suppressed regimes beyond the soft-gluon approximation. Gauge invariance of the physics results is demonstrated explicitly by performing the calculations in both the light-cone and covariant $R_ξ$ gauges. We also show how the process-dependent medium-induced radiative corrections factorize from the jet production cross section on the example of the quark jets considered here.
description: 52 pages, 15 pdf figures, as published in JHEP
การประยุกต์ใช้ระบบการวางแผนทรัพยากรทางธุรกิจขององค์กรโดยรวมเพื่อ การพัฒนาธุรกิจ
Creators: name: เกรียงไกร นามนัย
Publisher: name: โรงพิมพ์มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2560
Subjects: การประยุกต์
การพัฒนาองค์กร
ระบบการวางแผนทรัพยากรทางธุรกิจขององค์กรโดยรวม

description: วารสารวิชาการ คณะวิทยาการจัดการ, 2, 3, 75-84
Probing the Unconventional Superconducting State of LiFeAs by Quasiparticle Interference
Creators: name: Hänke, T.
name: Sykora, S.
name: Schlegel, R.
name: Baumann, D.
name: Harnagea, L.
name: Wurmehl, S.
name: Daghofer, M.
name: Büchner, B.
name: Brink, J. van den
name: Hess, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A crucial step in revealing the nature of unconventional superconductivity is to investigate the symmetry of the superconducting order parameter. Scanning tunneling spectroscopy has proven a powerful technique to probe this symmetry by measuring the quasiparticle interference (QPI) which sensitively depends on the superconducting pairing mechanism. A particularly well suited material to apply this technique is the stoichiometric superconductor LiFeAs as it features clean, charge neutral cleaved surfaces without surface states and a relatively high Tc~18K. Our data reveal that in LiFeAs the quasiparticle scattering is governed by a van-Hove singularity at the center of the Brillouin zone which is in stark contrast with other pnictide superconductors where nesting is crucial for both scattering and s+- superconductivity. Indeed, within a minimal model and using the most elementary order parameters, calculations of the QPI suggest a dominating role of the hole-like bands for the quasiparticle scattering. Our theoretical findings do not support the elementary singlet pairing symmetries s++, s+-, and d-wave. This brings to mind that the superconducting pairing mechanism in LiFeAs is based on an unusual pairing symmetry such as an elementary p-wave (which provides optimal agreement between the experimental data and QPI simulations) or a more complex order parameter (e.g. s+id-wave symmetry).
Perturbation theory of multi-plane lens effects in terms of mass ratios: Approximate expressions of lensed-image positions for two lens planes
Creators: name: Izumi, Koji
name: Asada, Hideki
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Continuing work initiated in an earlier publication (Asada, MNRAS. 394 (2009) 818), we make a systematic attempt to determine, as a function of lens and source parameters, the positions of images by multi-plane gravitational lenses. By extending the previous single-plane work, we present a method of Taylor-series expansion to solve the multi-plane lens equation in terms of mass ratios except for the neighborhood of the caustics. The advantage of this method is that it allows a systematic iterative analysis and clarifies the dependence on lens and source parameters. In concordance with the multi-plane lensed-image counting theorem that the lower bound on the image number is $2^N$ for N planes with a single point mass on each plane, our iterative results show how $2^N$ images are realized. Numerical tests are done to investigate if the Taylor expansion method is robust. The method with a small mass ratio works well for changing a plane separation, whereas it breaks down in the inner domain near the caustics.
description: 13 pages, 2 figures; adding a section about numerical tests; accepted by Progress of Theoretical Physics (PTP)
title: Παρουσίαση δυνατοτήτων του ελεύθερα διαθέσιμου λογισμικού πεπερασμένων στοιχείων Z88 AURORA
title: Presentation of capabilities of freely available finite element software Z88 Aurora
Creators: name: Κυρτσογλου Γεωργιος
Publisher: name: Technical University of Crete
Year: 2021

description: Στην παρούσα διπλωματική εργασία, θα αναλύσουμε τις δυνατότητες του λογισμικούZ88 Aurora και συγκεκριμένα τις δυνατότητες του στην ανάλυση δυναμικών και στατικών κατασκευών. Είναι σημαντικό να τονιστεί ότι πρόκειται για ένα ελεύθερα διαθέσιμο λογισμικό και ότι υπάρχει ελαφρύτερη εκδόση για φορητές συσκευές. Στη συνέχεια, με τη βοήθεια του Z88 Aurora, θα ακολουθήσουμε όλα τα βήματα μέχρι την επίλυση τάσεων και παραμορφώσεων σε ένα αντικείμενο το οποίο σχεδιάστηκε σε CAD λογισμικό.
Συγκεκριμένα το πρώτο μέρος της εργασίας είναι να γνωρίσουμε κάποιες βασικές
λειτουργίες του Z88 Aurora και το δεύτερο μέρος είναι η σχεδίαση μιας μεταλλικής δοκού με τη χρήση του λογισμικού Solidworks, η εισαγωγή του σχεδίου στο λογισμικό Z88 Aurora και όλη τη διαδικασία, την οποία θα αναπτύξουμε παρακάτω, επίλυσης τάσεων και παραμορφώσεων.
ผู้นำยุคใหม่กับการพัฒนาศักยภาพการแข่งขันวิสาหกิจชุมชน
Creators: name: ธนัณชัย สิงห์มาตย์
name: กุลธิดา ภูมิเหล่าแจ้ง
Publisher: name: โรงพิมพ์มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2560
Subjects: ผู้นำกลุ่มวิสาหกิจชุมชน
ผู้นำยุคใหม่
วิสาหกิจชุมชน

description: วารสารวิชาการ คณะวิทยาการจัดการ, 2, 3, 85-96
Methods to compare expensive stochastic optimization algorithms with application to road design
Creators: name: Xie, Shangwei
Publisher: name: University of British Columbia
Year: 2017

description: Analyzing test data of stochastic optimization algorithms under random restarts is challenging. The data needs to be resampled to estimate the behavior of the incumbent solution during the optimization process. The estimation error needs to be understood in order to make reasonable inference on the actual behavior of the incumbent solution. Comparing the performance of different algorithms based on proper interpretation of the estimator is also very important. We model the incumbent solution of the optimization problem over time as a stochastic process and design an estimator of it based on bootstrapping from test data. Some asymptotic properties of the estimator and its bias are shown. The estimator is then validated by an out-of-sample test. Three methods for comparing the performance of different algorithms based on the estimator are proposed and demonstrated with data from a road design optimization problem.
Analysis of the 3d massive renormalization group perturbative expansions: a delicate case
Creators: name: Delamotte, B.
name: Dudka, M.
name: Holovatch, Yu.
name: Mouhanna, D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The effectiveness of the perturbative renormalization group approach at fixed space dimension d in the theory of critical phenomena is analyzed. Three models are considered: the O(N) model, the cubic model and the antiferromagnetic model defined on the stacked triangular lattice. We consider all models at fixed d=3 and analyze the resummation procedures currently used to compute the critical exponents. We first show that, for the O(N) model, the resummation does not eliminate all non-physical (spurious) fixed points (FPs). Then the dependence of spurious as well as of the Wilson-Fisher FPs on the resummation parameters is carefully studied. The critical exponents at the Wilson-Fisher FP show a weak dependence on the resummation parameters. On the contrary, the exponents at the spurious FP as well as its very existence are strongly dependent on these parameters. For the cubic model, a new stable FP is found and its properties depend also strongly on the resummation parameters. It appears to be spurious, as expected. As for the frustrated models, there are two cases depending on the value of the number of spin components. When N is greater than a critical value Nc, the stable FP shows common characteristic with the Wilson-Fisher FP. On the contrary, for N3, we conclude that the transitions for XY and Heisenberg frustrated magnets are of first order.
description: 16 pages, 9 figures
Presymptomatic risk assessment for chronic non-communicable diseases
Creators: name: Padhukasahasram, Badri
name: Halperin, Eran
name: Wessel, Jennifer
name: Thomas, Daryl
name: Silver, Elana
name: Trumbower, Heather
name: Cargill, Michele
name: Stephan, Dietrich
Publisher: name: arXiv
Year: 2010
Subjects: subject: Genomics (q-bio.GN)
subject: Quantitative Methods (q-bio.QM)
subject: Applications (stat.AP)
subject: Methodology (stat.ME)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: The prevalence of common chronic non-communicable diseases (CNCDs) far overshadows the prevalence of both monogenic and infectious diseases combined. All CNCDs, also called complex genetic diseases, have a heritable genetic component that can be used for pre-symptomatic risk assessment. Common single nucleotide polymorphisms (SNPs) that tag risk haplotypes across the genome currently account for a non-trivial portion of the germ-line genetic risk and we will likely continue to identify the remaining missing heritability in the form of rare variants, copy number variants and epigenetic modifications. Here, we describe a novel measure for calculating the lifetime risk of a disease, called the genetic composite index (GCI), and demonstrate its predictive value as a clinical classifier. The GCI only considers summary statistics of the effects of genetic variation and hence does not require the results of large-scale studies simultaneously assessing multiple risk factors. Combining GCI scores with environmental risk information provides an additional tool for clinical decision-making. The GCI can be populated with heritable risk information of any type, and thus represents a framework for CNCD pre-symptomatic risk assessment that can be populated as additional risk information is identified through next-generation technologies.
description: Plos ONE paper. Previous version was withdrawn to be updated by the journal's pdf version
An anisotropic standing wave braneworld and associated Sturm-Liouville problem
Creators: name: Gogberashvili, Merab
name: Herrera-Aguilar, Alfredo
name: Malagon-Morejon, Dagoberto
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a consistent derivation of the recently proposed 5D anisotropic standing wave braneworld generated by gravity coupled to a phantom-like scalar field. We explicitly solve the corresponding junction conditions, a fact that enables us to give a physical interpretation to the anisotropic energy-momentum tensor components on the brane. So matter on the brane represents an oscillating fluid which emits anisotropic waves into the bulk. We also analyze the Sturm-Liouville problem associated to the correct localization condition of the transverse to the brane metric and scalar fields. It is shown that this condition restricts the physically meaningful space of solutions for the localization of the fluctuations of the model.
description: 17 pages, uses iopart, presented at GR19, Mexico City, Mexico, 5-9 July 2010
Analytical dispersive construction of $η\to3π$ amplitude: First order in isospin breaking
Creators: name: Kampf, Karol
name: Knecht, Marc
name: Novotný, Jiří
name: Zdráhal, Martin
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Because of their small electromagnetic corrections, the isospin-breaking decays $η\to3π$ seem to be good candidates for extracting isospin-breaking parameters $ (m_d-m_u)$. This task is unfortunately complicated by large chiral corrections and the discrepancy between the experimentally measured values of the Dalitz parameters describing the energy dependence of the amplitudes of these decays and those predicted from chiral perturbation theory. We present two methods based on an analytic dispersive representation that use the information from the NNLO chiral result and the one from the measurement of the charged $η\to3π$ decay by KLOE together in a harmonized way in order to determine the value of the quark mass ratio $R$. Our final result is $R=37.7\pm 2.2$. This value supplemented by values of $m_s/\hat{m}$ or even $\hat{m}$ and $m_s$ from other methods (as sum-rules or lattice) enables us to obtain further quark mass characteristics. For instance the recent lattice value for $m_s/\hat{m}~27.5$ leads to $Q= 23.1\pm0.7$. We also quote the corresponding values of the current masses $m_u$ and $m_d$.
description: 40 pages, 4 figures
Quantum simulator of an open quantum system using superconducting qubits: exciton transport in photosynthetic complexes
Creators: name: Mostame, Sarah
name: Rebentrost, Patrick
name: Eisfeld, Alexander
name: Kerman, Andrew J.
name: Tsomokos, Dimitris I.
name: Aspuru-Guzik, Alán
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Open quantum system approaches are widely used in the description of physical, chemical and biological systems. A famous example is electronic excitation transfer in the initial stage of photosynthesis, where harvested energy is transferred with remarkably high efficiency to a reaction center. This transport is affected by the motion of a structured vibrational environment, which makes simulations on a classical computer very demanding. Here we propose an analog quantum simulator of complex open system dynamics with a precisely engineered quantum environment. Our setup is based on superconducting circuits, a well established technology. As an example, we demonstrate that it is feasible to simulate exciton transport in the Fenna-Matthews-Olson photosynthetic complex. Our approach allows for a controllable single-molecule simulation and the investigation of energy transfer pathways as well as non-Markovian noise-correlation effects.
description: 14 pages, 7 figures, minor modifications
Level sets estimation and Vorob'ev expectation of random compact sets
Creators: name: Heinrich, Philippe
name: Stoica, Radu Stefan
name: Tran, Viet Chi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: The issue of a "mean shape" of a random set $X$ often arises, in particular in image analysis and pattern detection. There is no canonical definition but one possible approach is the so-called Vorob'ev expectation $\E_V(X)$, which is closely linked to quantile sets. In this paper, we propose a consistent and ready to use estimator of $\E_V(X)$ built from independent copies of $X$ with spatial discretization. The control of discretization errors is handled with a mild regularity assumption on the boundary of $X$: a not too large 'box counting' dimension. Some examples are developed and an application to cosmological data is presented.
Seemingly gliding: the power of metadata in academic resource discovery systems
Creators: name: Bell, Lucy
name: Vernitski, Anat
Publisher: name: Zenodo
Year: 2011
Subjects: subject: https://iskouk.org/subjects/PRUIHEDJ
subject: https://iskouk.org/subjects/005THP1B
subject: https://iskouk.org/subjects/ZRJTK0W1
subject: https://iskouk.org/subjects/Q4L57KRN

description: Creators of resource discovery systems are at a turning point in development: their systems must satisfy the users’ needs for the delivery of high-quality, academically-rigorous content, while also providing the most straightforward, Google-like interfaces possible. The role of metadata in this scenario becomes paramount as users enter a world which seems serendipitous, but which is still subject to academic rigour, relevance and comprehensiveness.
 Ironically, such a system, necessarily supported by high-quality metadata, increasingly conceals them, thus lowering their profile in the user’s mind, and their importance becomes even more camouflaged to the user community. Without them, however, there is no system.
 This paper explores this dichotomy, describing a vision for resource discovery which creates a seamless journey between related, yet disparate, resources. It moves on to look at a case study of a single tool: the HASSET thesaurus, developed at the UK Data Archive. This tool’s journey from an inhouse-developed thesaurus to the lynch-pin of many online services is described in detail. Lastly, the paper takes the theory of achieving focused results from a simple interface and, using HASSET, applies it to an existing service: the Economic and Social Data Service (ESDS). Metadata is shown to be the essential – and yet increasingly
 invisible – force at work in effective resource discovery systems.
Criticality transition for positive powers of the discrete Laplacian on the half line
Creators: name: Gerhat, Borbala
name: Krejcirik, David
name: Stampach, Frantisek
Publisher: name: arXiv
Year: 2023
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 26D15, 26A33

description: We study the criticality and subcriticality of powers $(-Δ)^α$ with $α>0$ of the discrete Laplacian $-Δ$ acting on $\ell^2(\mathbb{N})$. We prove that these positive powers of the Laplacian are critical if and only if $α\ge 3/2$. We complement our analysis with Hardy type inequalities for $(-Δ)^α$ in the subcritical regimes $α\in (0,3/2)$. As an illustration of the critical case, we describe the negative eigenvalues emerging by coupling the discrete bilaplacian with an arbitrarily small localized potential.
description: 16 pages