cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Addressing the Short-Baseline Neutrino Anomalies with Energy-Dependent Mixing Parameters
Creators: name: Babu, K. S.
name: Brdar, Vedran
name: de Gouvêa, André
name: Machado, Pedro A. N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Several neutrino experiments have reported results that are potentially inconsistent with our current understanding of the lepton sector. A candidate solution to these so-called short-baseline anomalies is postulating the existence of new, eV-scale, mostly sterile neutrinos that mix with the active neutrinos. This hypothesis, however, is strongly disfavored once one considers all neutrino data, especially those that constrain the disappearance of muon and electron neutrinos at short-baselines. Here, we show that if the sterile-active mixing parameters depend on the energy-scales that characterize neutrino production and detection, the sterile-neutrino hypothesis may provide a reasonable fit to all neutrino data. The reason for the improved fit is that the stringent disappearance constraints on the different elements of the extended neutrino mixing matrix are associated to production and detection energy scales that are different from those that characterize the anomalous LSND and MiniBooNE appearance data. We show, via a concrete example, that secret interactions among the sterile neutrinos can lead to the results of interest.
description: 8 pages, 5 figures
Differential high-resolution stimulated CW Raman spectroscopy of hydrogen in a hollow-core fiber
Creators: name: Westergaard, Philip G.
name: Lassen, Mikael
name: Petersen, Jan C.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate sensitive high-resolution stimulated Raman measurements of hydrogen using a hollow-core photonic crystal fiber (HC-PCF). The Raman transition is pumped by a narrow linewidth (<50 kHz) 1064 nm continuous-wave (CW) fiber laser. The probe light is produced by a homebuilt CW optical parametric oscillator (OPO), tunable from around 800 nm to 1300 nm (linewidth ~ 5 MHz). These narrow linewidth lasers allow for an excellent spectral resolution of approximately 10^-4 cm^(-1). The setup employs a differential measurement technique for noise rejection in the probe beam, which also eliminates background signals from the fiber. With the high sensitivity obtained, Raman signals were observed with only a few mW of optical power in both the pump and probe beams. This demonstration allows for high resolution Raman identification of molecules and quantification of Raman signal strengths.
description: 9 pages, 5 figures
title: Metropolitan planning in Montréal: 1960-1998
title: L'urbanise métropolitain à Montréal : 1960-1998
titleType: AlternativeTitle
Creators: name: Beaudet, Gérard
Publisher: name: Vancouver Island University - Royal Roads University
Year: 1999
Subjects: subject: City planning--Québec (Province)--Montréal
subject: Montréal (Québec)--History
subject: Aménagement de la ville--Québec (Province)--Montréal
subject: Montréal (Québec)--Histoire

description: During the 1950s and 1960s, the conditions for a radical transformation of metropolitan Montreal were in place. This article retraces the major steps of this evolution. First, it reminds us that the city at the end of World War II had inherited traits from the industrial period. It then brings to light the principal issues facing planners over the past 40 years, proposes an overview of successive responses brought by planners and developers, and presents, in broad terms, the principal characteristics of the urban form at each of its stages. This Plan Canada brief tour ends with the identification of a few approaches that seem to have adapted to the challenges of the time.
description: Au tournant des années 1950 aux années 1960, les conditions d'une transformation radicale de I'agglomération métropolitaine de Montréal sont en place. Le présent article retrace les grandes étapes de cette évolution. Il rappelle d'abord que la métropole, au sortir de la seconde Guerre mondiale, constituait un héritage de la période industrielle. Il fait ensuite ressortir les principaux enjeux auxquels les planificateurs ont été confrontés au cours des quarante dernières années, propose un survol des réponses successives apportées par les urbanistes et les aménagistes et présente, dans ses grandes lignes, les principales caractéristiques de la forme urbaine à chacune des principales étapes. Ce bref tour d'horizon se termine par l'identification de quelques pistes qui semblent adaptées aux défis de l'heure.
description: Text in English and French.
description: https://viurrspace.ca/bitstream/handle/10613/6632/Beaudet.pdf?sequence=6
Poisson-Dirichlet distributions and weakly first-order spin-nematic phase transitions
Creators: name: Caci, Nils
name: Mühlbacher, Peter
name: Ueltschi, Daniel
name: Wessel, Stefan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We provide a quantitative characterization of generic weakly first-order thermal phase transitions out of planar spin-nematic states in three-dimensional spin-one quantum magnets, based on calculations using Poisson-Dirichlet distributions (PD) within a universal loop model formulation, combined with large-scale quantum Monte Carlo calculations. In contrast to earlier claims, the thermal melting of the nematic state is not continuous, instead a weakly first-order transition is identified from both thermal properties and the distribution of the nematic order parameter. Furthermore, based on PD calculations, we obtain exact results for the order parameter distribution and Binder cumulants at the discontinuous melting transition. Our findings establish the thermal melting of planar spin-nematic states as a generic platform for quantitative approaches to weakly first-order phase transitions in quantum systems with a continuous SU(2) internal symmetry.
description: 5+5 pages, 4+4 figures
Fuel for the Information Age: A Guide to Nuclear Energy Issues and Information
Creators: name: Humphreys, Robert B.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2001
Subjects: Special librarians--science librarians
Nuclear energy information
Collection development--scientific and technical libraries
Information systems--special subjects--nuclear energy
Special collections--special subjects--nuclear energy
Special libraries--scientific and technical libraries

description: Nuclear energy information tends to be polarized into two camps: anti-nuclear and industry-sponsored, pro-nuclear materials. There is a need to identify sources on both sides and guide readers and researchers to materials that will lead to independent analysis. The need for nuclear energy information has intensified due to recent energy shortages, dramatic price increases, and a renewed debate on the future role of nuclear energy in supplying power for the electronic revolution of information.  This paper is a guide for librarians and information specialists who need to assist patrons in locating and analyzing non-technical information dealing with the origins, history, use, and future role of nuclear energy. It presents a history of nuclear energy with a focus on its impact on library science, followed by a timeline of nuclear energy information and an annotated bibliography of selected works.
Eisenstein series associated with $Γ_0(2)$
Creators: name: Hahn, Heekyoung
Publisher: name: arXiv
Year: 2015
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this paper, we define the normalized Eisenstein series $\mathcal{P}$, $e$, and $\mathcal{Q}$ associated with $Γ_0(2),$ and derive three differential equations satisfied by them from some trigonometric identities. By using these three formulas, we define a differential equation depending on the weights of modular forms on $Γ_0(2)$ and then construct its modular solutions by using orthogonal polynomials and Gaussian hypergeometric series. We also construct a certain class of infinite series connected with the triangular numbers. Finally, we derive a combinatorial identity from a formula involving the triangular numbers.
description: This is an old paper uploaded for archival purposes
Constraining Weil–Petersson volumes by universal random matrix correlations in low-dimensional quantum gravity
Creators: name: Weber, Torsten
name: Haneder, Fabian
name: Richter, Klaus
name: Urbina, Juan Diego
Publisher: name: Universität Regensburg
Year: 2023
Subjects: subject: 530 Physik

description: Based on the discovery of the duality between Jackiw–Teitelboim quantum gravity and a double-scaled matrix ensemble by Saad, Shenker and Stanford in 2019, we show how consistency between the two theories in the universal random matrix theory (RMT) limit imposes a set of constraints on the volumes of moduli spaces of Riemannian manifolds. These volumes are given in terms of polynomial functions, the Weil–Petersson (WP) volumes, solving a celebrated nonlinear recursion formula that is notoriously difficult to analyse. Since our results imply linear relations between the coefficients of the WP volumes, they therefore provide both a stringent test for their symbolic calculation and a possible way of simplifying their construction. In this way, we propose a long-term program to improve the understanding of mathematically hard aspects concerning moduli spaces of hyperbolic manifolds by using universal RMT results as input.
title: Planning on the edge: Development in Canada's East Coast marine environment
title: Le développement du milieu marin au large de la côte Est du Canada
titleType: AlternativeTitle
Creators: name: Bishop, Mary
Publisher: name: Vancouver Island University - Royal Roads University
Year: 1998
Subjects: subject: Offshore structures--Canada--Atlantic Provinces--Planning
subject: Fisheries--Canada--Atlantic Provinces
subject: Structures offshore--Canada--Provinces de l'Atlantique--Planification
subject: Pêches--Canada--Provinces de l'Atlantique
subject: Canning & Pitt Associates, Inc. (St. John's, N.L.)

description: Marine-related development activities require environmental and socioeconomic impact assessments, as well as consultation with other stakeholders who share and use that environment. Major projects such as the PEI Fixed Link, Hibernia's offshore operations, or the Sable Offshore Energy Project required careful planning in order to minimize negative impacts on established fishing activities. These impacts could include temporary or permanent loss of access to traditional fishing grounds, marine life habitat alteration, or damage to fishing gear or vessels.
description: Les activités de développement en milieu marin exigent une évaluation des répercussions environnementales et socio-economiques ainsi que la consultation des autres intervenants qui parragent et utilisent ce milieu. Les projets de grande envergure, comme le raccordement permanent de l'Île-du-Prince-Édouard, les activités extracôtières d'Hibernia ou le Projet énergétique extracôtier de l'île de Sable, exigent une planification attentive afin de minimiser les conséquences négatives sur les activités de pêche établies. Ces conséquences pourraient comprendre la perte temporaire ou permanente de l'accès à des lieux de pêche traditionnels, la détérioration de l'habitat sous-marin oud des dommages causés aux engins ou aux bateaux de pêche.
description: Text in English and French.
description: Wide range/Hors des sentiers battus
description: https://viurrspace.ca/bitstream/handle/10613/6648/Bishop.pdf?sequence=3
Spectral line fluorescence in moving envelopes of stars
Creators: name: Bertout, Claude
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The formation of optical fluorescent lines in moving media has not yet been studied in detail, so this work represents a first step in investigating the fluorescence process in different types of macroscopic velocity fields: (a) accelerated outflows, (b) accelerated infalls, and (c) non-monotonic velocity fields (such as an accelerating outflow followed by a deceleration region or an accretion shock front). We solve the radiative transfer equations for the lines involved in the fluorescent process, assuming spherical symmetry and a simplified atomic model. We use the framework of the generalized Sobolev theory for computing the interacting, non-local source functions. The emergent line fluxes are then integrated exactly. Because of Doppler shifts in the moving gaseous envelope, photons of the three lines involved in TTS FeI fluorescence CaII H, FeI 3969, and H_epsilon interact with each other in a complex way, so that fluorescent amplification of the line flux occurs not only for FeI 3969, but also for the other two lines, in all velocity fields that we investigated. With the assumption of LTE populations, the line source functions of moderately optically thick lines are not strongly affected by line interactions, while they are depressed in the inner envelope for optically thick lines because of stellar photon absorption in the interaction regions. Fluorescent amplification takes place mainly in the observer's reference frame during the flux integration. Further comparison with observations will require solving the rate equations for the atomic populations involved, along with the radiation field computed with the method presented here. The main product of this research is the open-source computer code SLIM2 (Spectral Line Interactions in Moving Media), written in Python/Numpy, which numerically solves the fluorescence problem for arbitrary 2D velocities.
description: 21 pages, accepted by A&A
Open Challenges in Synthetic Speech Detection
Creators: name: Cuccovillo, Luca
name: Papastergiopoulos, Christoforos
name: Vafeiadis, Anastasios
name: Yaroshchuk, Artem
name: Aichroth, Patrick
name: Votis, Konstantinos
name: Tzovaras, Dimitrios
Publisher: name: arXiv
Year: 2022
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper the current status and open challenges of synthetic speech detection are addressed. The work comprises an initial analysis of available open datasets and of existing detection methods, a description of the requirements for new research datasets compliant with regulations and better representing real-case scenarios, and a discussion of the desired characteristics of future trustworthy detection methods in terms of both functional and non-functional requirements. Compared to other works, based on specific detection solutions or presenting single dataset of synthetic speeches, our paper is meant to orient future state-of-the-art research in the domain, to quickly lessen the current gap between synthesis and detection approaches.
Environment Classification via Blind Roomprints Estimation
Creators: name: Baum, Malte
name: Cuccovillo, Luca
name: Yaroshchuk, Artem
name: Aichroth, Patrick
Publisher: name: arXiv
Year: 2022
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper we present a novel approach for environment classification for speech recordings, which does not require the selection of decaying reverberation tails. It is based on a multi-band RT60 analysis of blind channel estimates and achieves an accuracy of up to 93.6% on test recordings derived from the ACE corpus.
Online Learning and Information Exponents: On The Importance of Batch size, and Time/Complexity Tradeoffs
Creators: name: Arnaboldi, Luca
name: Dandi, Yatin
name: Krzakala, Florent
name: Loureiro, Bruno
name: Pesce, Luca
name: Stephan, Ludovic
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We study the impact of the batch size $n_b$ on the iteration time $T$ of training two-layer neural networks with one-pass stochastic gradient descent (SGD) on multi-index target functions of isotropic covariates. We characterize the optimal batch size minimizing the iteration time as a function of the hardness of the target, as characterized by the information exponents. We show that performing gradient updates with large batches $n_b \lesssim d^{\frac{\ell}{2}}$ minimizes the training time without changing the total sample complexity, where $\ell$ is the information exponent of the target to be learned \citep{arous2021online} and $d$ is the input dimension. However, larger batch sizes than $n_b \gg d^{\frac{\ell}{2}}$ are detrimental for improving the time complexity of SGD. We provably overcome this fundamental limitation via a different training protocol, \textit{Correlation loss SGD}, which suppresses the auto-correlation terms in the loss function. We show that one can track the training progress by a system of low-dimensional ordinary differential equations (ODEs). Finally, we validate our theoretical results with numerical experiments.
Measuring Self-Censorship in School Media Centers
Creators: name: Bellows, Nicholas A.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2005
Subjects: Censorship--Florida
School Libraries--Book Collections School Libraries--Florida
Censorship--School Libraries
Censorship

description: This study describes an investigation into the extent of self-censorship within school  media centers of Florida public high schools. This investigation was conducted to  measure what percentage of schools had a majority of highly regarded books containing  controversial materials. Failure to have a majority of these books resulted in the school  being designated as engaging in self-censorship.  The OPACs of 102 Florida public highs schools were searched for twenty-five  controversial titles. The results showed that over 75% of the schools sampled had fewer  than 50% of the controversial books. An attempt was made to improve upon a previous  study by accounting for a lack of books resulting from budget issues. This attempt was  flawed. Thoughts on how to improve this aspect of the study are discussed.
CBS News/New York Times Poll: Massachusetts Republican Primary Day Exit Poll
Creators: name: CBS News
name: New York Times
Publisher: name: Roper Center for Public Opinion Research
Year: 1989

description: Presidential primary vote(1); reasons for candidate choice(2); presidential candidates(4); strength of candidate choice(1); Reagan's job performance(1); 1984 presidential vote(1); hypothetical 1988 presidential vote(1).
Fine Structures Roll up in the Flow of Film Boiling at High Density Ratios
Creators: name: Mortazavi, Saeed
name: Yaali, Iman
Publisher: name: arXiv
Year: 2024
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Film boiling has practical applications in the current technology including steam power plants, cooling of electronic devices and emergency cooling systems. A finite difference/front tracking method is used to simulate film boiling at high density ratios on a horizontal plate subject to a constant wall heat flux. The grid resolution is relatively high (768 grids per width of the domain). The flow is dominated by Rayleigh-Taylor instability as well as Kelvin-Helmholtz instability. The flow structure includes the roll up of the interface between the gas and liquid. This happens at high density ratio (1000) where the difference between the gas and the liquid velocities across the interface is large. The jump in tangential velocity is an order of magnitude smaller at a lower density ratio (100). Hence, there is no roll up at lower density ratio. The flow is also influenced by vortex development as a result of the baroclinic term in the vorticity transport equation. The density gradient is large at the interface at high density ratio which tends to increase the baroclinic term. The plot of pressure gradient and density gradient shows that they are not parallel in the roll up regions. As a result, vortices in small scales develop that shed in the gas phase. The plot of the enstrophy with time shows that it shows smooth variation that match for two grid resolutions, however at a specific time enstrophies become spiky, and they depart from each other at two grid resolutions. The spiky behavior of enstrophy is due to vortex shedding in the roll up region.
description: Submitted to Acta Mechanica
Heterotic string on the CHL orbifold of K3
Creators: name: Datta, Shouvik
name: David, Justin R.
name: Lust, Dieter
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study ${\cal N}=2$ compactifications of heterotic string theory on the CHL orbifold $(K3\times T^2)/\mathbb{Z}_N$ with $N= 2, 3, 5, 7$. $\mathbb{Z}_N$ acts as an involution on $K3$ together with a shift of $1/N$ along one of the circles of $T^2$. These compactifications generalize the example of the heterotic string on $K3\times T^2$ studied in the context of dualities in ${\cal N}=2$ string theories. We evaluate the new supersymmetric index for these theories and show that their expansion can written in terms of the McKay-Thompson series associated with the $\mathbb{Z}_N$ involution embedded in the Mathieu group $M_{24}$. We then evaluate the difference in one-loop threshold corrections to the non-Abelian gauge couplings with Wilson lines and show that their moduli dependence is captured by Siegel modular forms related to dyon partition functions of ${\cal N}=4$ string theories.
description: 46 pages
Putting high-index Cu on the map for high-yield, dry-transferred CVD graphene
Creators: name: Burton, Oliver J.
name: Winter, Zachary C. M.
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Beschoten, Bernd
name: Stampfer, Christoph
name: Hofmann, Stephan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Reliable, clean transfer and interfacing of 2D material layers is technologically as important as their growth. Bringing both together remains a challenge due to the vast, interconnected parameter space. We introduce a fast-screening descriptor approach to demonstrate holistic data-driven optimization across the entirety of process steps for the graphene-Cu model system. We map the crystallographic dependencies of graphene chemical vapor deposition, interfacial Cu oxidation to decouple graphene, and its dry delamination across inverse pole figures. Their overlay enables us to identify hitherto unexplored (168) higher index Cu orientations as overall optimal. We show the effective preparation of such Cu orientations via epitaxial close-space sublimation and achieve mechanical transfer with very high yield (>95%) and quality of graphene domains, with room-temperature electron mobilities in the range of 40000 cm$^2$/(Vs). Our approach is readily adaptable to other descriptors and 2D materials systems, and we discuss the opportunities of such holistic optimization.
description: 56 pages, 19 figures
CBS News/New York Times Poll: Welfare and Affirmative Action
Creators: name: CBS News
name: New York Times
Publisher: name: Roper Center for Public Opinion Research
Year: 1995

description: Clinton job performance(3); Congressional job performance(5); Clinton characteristics(2); Clinton vs. Republicans in Congress(6); abortion(2); favorability ratings of political leaders(9); Newt Gingrich(3); welfare(20); budget deficit and taxes(6); affirmative action and discrimination(5); 1996 election(2).
Active photocatalysts for CO2 conversion by severe plastic deformation (SPD)
Creators: name: Akrami, Saeid
name: Ishihara, Tatsumi
name: Fuji, Masayoshi
name: Edalati, Kaveh
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Excessive CO2 emission from fossil fuel usage has resulted in global warming and environmental crises. To solve this problem, the photocatalytic conversion of CO2 to CO or useful components is a new strategy that has received significant attention. The main challenge in this regard is exploring photocatalysts with high efficiency for CO2 photoreduction. Severe plastic deformation (SPD) through the high-pressure torsion (HPT) process has been effectively used in recent years to develop novel active catalysts for CO2 conversion. These active photocatalysts have been designed based on four main strategies: (i) oxygen vacancy and strain engineering, (ii) stabilization of high-pressure phases, (iii) synthesis of defective high-entropy oxides, and (iv) synthesis of low-bandgap high-entropy oxynitrides. These strategies can enhance the photocatalytic efficiency compared with conventional and benchmark photocatalysts by improving CO2 adsorption, increasing light absorbance, aligning the band structure, narrowing the bandgap, accelerating the charge carrier migration, suppressing the recombination rate of electrons and holes, and providing active sites for photocatalytic reactions. This article reviews recent progress in the application of SPD to develop functional ceramics for photocatalytic CO2 conversion.
Warped Disk Evolution in Grid-Based Simulations
Creators: name: Kimmig, C. N.
name: Dullemond, C. P.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Observations show evidence that a significant fraction of protoplanetary disks contain warps. A warp in a disk evolves in time affecting the appearance of shadows and greatly influencing kinematic signatures. So far, many theoretical studies of warped disks have been conducted using Smoothed Particle Hydrodynamics (SPH) methods. In our approach, we use a grid-based method in spherical coordinates which has notable advantages: the method allows for accurate modelling of low viscosity values and the resolution does not depend on density or mass of the disk, which allows surface structures to be resolved. We perform 3D simulations using FARGO3D to simulate the evolution of a warped disk and compare the results to one-dimensional models using a ring code. Additionally, we extensively investigate the applicability of grid-based methods to misaligned disks and test their dependency on grid resolution as well as disk viscosity. We find that grid-based simulations are capable of simulating disks not aligned to the grid geometry. Our three-dimensional simulation of a warped disk compares well to one-dimensional models in evolution of inclination. However, we find a twist which is not captured in 1D models. After thorough analysis we suspect this to be a physical effect possibly caused by non-linear effects neglected in the one-dimensional equations. Evaluating the internal dynamics, we find sloshing and breathing motions as predicted in local shearing box analysis. They can become supersonic, which may have consequences on kinematic observations of warped disks. Warped disks can be accurately modelled in 3D grid-based simulations when using reasonably good resolution, especially in the $θ$-direction. We find good agreement with the linear approximation of the sloshing motion which highlights the reliability of 1D models.
description: accepted for publication in Astronomy & Astrophysics
ผลสัมฤทธิ์ทางการเรียนในรายวิชา วิทยาศาสตร์และเทคโนโลยี ที่เรียนด้วยระบบการจัดการเรียนแบบ E learning ผ่านห้องเรียนฟิสิกส์ราชมงคล
Creators: name: จันทนี อุทธิสินธุ์
Publisher: name: มหาวิทยาลัยวลัยลักษณ์
Year: 2017
Subjects: ระบบการจัดการเรียนแบบ E learning
ผลสัมฤทธิ์ทางการเรียน

description: วารสารนวัตกรรมการเรียนรู้ มหาวิทยาลัยวลัยลักษณ์, 3, 1, 61-71
Pseudo-CTs from T1-weighted MRI for planning of low-intensity transcranial focused ultrasound neuromodulation: an open-source tool
Creators: name: Yaakub, Siti Nurbaya
name: White, Tristan A.
name: Kerfoot, Eric
name: Verhagen, Lennart
name: Hammers, Alexander
name: Fouragnan, Elsa F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Background: Individual skull models of bone density and geometry are important when planning the expected transcranial ultrasound acoustic field and estimating mechanical and thermal safety in low-intensity transcranial ultrasound stimulation (TUS) studies. Computed tomography (CT) images have typically been used to estimate skull acoustic properties. However, obtaining CT images in research participants may be prohibitive due to exposure to ionising radiation and limited access to CT scanners within research groups. Objective: We present a validated open-source tool for researchers to obtain individual skull estimates from T1-weighted MR images, for use in acoustic simulations. Methods: We refined a previously trained and validated 3D convolutional neural network (CNN) to generate 100 keV pseudo-CTs. The network was pretrained on 110 individuals and refined and tested on a database of 37 healthy control individuals. We compared simulations based on reference CTs to simulations based on our pseudo-CTs and binary skull masks, a common alternative in the absence of CT. Results: Compared with reference CTs, our CNN produced pseudo-CTs with a mean absolute error of 109.8 +/- 13.0 HU across the whole head and 319.3 +/- 31.9 HU in the skull. In acoustic simulations, the focal pressure was statistically equivalent for simulations based on reference CT and pseudo-CT (0.48 +/- 0.04 MPa and 0.50 +/- 0.04 MPa respectively) but not for binary skull masks (0.28 +/- 0.05 MPa). Conclusions: We show that our network can produce pseudo-CT comparable to reference CTs in healthy individuals, and that these can be used in acoustic simulations.
description: 24 pages, 4 figures
Magnetic helicity fluxes from triple correlators
Creators: name: Gopalakrishnan, Kishore
name: Subramanian, Kandaswamy
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Fluxes of the magnetic helicity density play an important role in large-scale turbulent dynamos, allowing the growth of large-scale magnetic fields while overcoming catastrophic quenching. We show here, analytically, how several important types of magnetic helicity fluxes can arise from terms involving triple correlators of fluctuating fields in the helicity density evolution equation. For this, we assume incompressibility and weak inhomogeneity, and use a quasinormal closure approximation: fourth-order correlators are replaced by products of second-order ones, and the effect of the fourth-order cumulants on the evolution of the third moments is modelled by a strong damping term. First, we show how a diffusive helicity flux, till now only measured in simulations, arises from the triple correlation term. This is accompanied by what we refer to as a `random advective flux', which predominantly transports magnetic helicity along the gradients of the random fields. We also find that a new helicity flux contribution, in some aspects similar to that first proposed by Vishniac, can arise from the triple correlator. This contribution depends on the gradients of the random magnetic and kinetic energies along the large-scale vorticity, and thus arises in any rotating, stratified system, even if the turbulence is predominantly nonhelical. It can source a large-scale dynamo by itself while spatially transporting magnetic helicity within the system.
description: 19 pages. Version accepted by ApJ. Changes from v1: More prominent discussion of prior work in sec 4.2. Full expression for the helicity fluxes (earlier equation 12) has now been moved to appendix E. Clarified the closure used. Corrected some typos in the explanation of the VC approximation (no change in the presented results)
การปรับเปลี่ยนห้องเรียนไปสู่ การเรียนรู้เชิงรุกโดยวิธีกระบวนกร ในรายวิชาทางด้านวิศวกรรมอุตสาหการ
Creators: name: ญาณี กลั่นภูมิศรี
name: อนุชา วัฒนาภา
Publisher: name: มหาวิทยาลัยวลัยลักษณ์
Year: 2017
Subjects: การจัดการเรียนรู้เชิงรุก
วางผังโรงงาน
กิจกรรมเกมเป็นฐานในการเรียนรู้
กระบวนกร

description: วารสารนวัตกรรมการเรียนรู้ มหาวิทยาลัยวลัยลักษณ์, 3, 1, 5-28
กลยุทธ์การสร้างภาพลักษณ์ร้านค้าเพื่อเพิ่มศักยภาพของร้านค้าปลีกอุปกรณ์กีฬาแบบดั้งเดิม
Creators: name: นันท์นภัส พลเศรษฐเลิศ
Publisher: name: คณะวิทยาการจัดการ มหาวิทยาลัยราชภัฏอุดรธานี
Year: 2566
Subjects: การสร้างภาพลักษณ์ร้านค้า
ประโยชน์ของร้านค้า
พฤติกรรมผู้บริโภค
กลยุทธ์ธุรกิจ
ร้านค้ากีฬา

description: วารสารวิทยาการจัดการ มหาวิทยาลัยราชภัฏอุดรธานี, 5, 3, 103-117
Native Language and the Real-Time Virtual Reference Interview
Creators: name: Mahendra, Sundeep K.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2009
Subjects: Foreign students
Use studies--Reference services
College and university libraries--Reference services
Reference services--Evaluation
Electronic reference services
College and university libraries--Services to minorities

description: As libraries seek to provide more ways to meet information needs in our rapidly evolving electronic environment, increasingly university libraries are providing reference services via virtual reference mediums such as chat services.  Researchers have begun examining these services yet little study has been done concerning the experience of non-native English speakers in this medium.  This study was conducted to determine the value and effectiveness of virtual reference services for international students.     Participants were instructed to ask a reference question of the chat reference service of the University of North Carolina at Chapel Hill Libraries and then to complete an online questionnaire in response to that interaction.  Results point to a greater comfort level with chat reference vs. face-to-face interactions for a majority of participants and provide a basis for further study into methods and practices to improve service to non-native English speakers.
การพัฒนาบทเรียนคอมพิวเตอร์ช่วยสอน วิชาการจัดการสารสนเทศบนเครือข่ายอินเทอร์เน็ต
Creators: name: อมร  เจือตี๋
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: บทเรียนคอมพิวเตอร์ช่วยสอน

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 1, 91
Estimation of the diffusion coefficient of Heavy Quarks in light of Gribov-Zwanziger action
Creators: name: Madni, Sadaf
name: Mukherjee, Arghya
name: Bandyopadhyay, Aritra
name: Haque, Najmul
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The heavy quark momentum diffusion coefficient ($κ$) is one of the most essential ingredients for the Langevin description of heavy quark dynamics. In the temperature regime relevant to the heavy ion collision phenomenology, a substantial difference exists between the lattice estimations of $κ$ and the corresponding leading order (LO) result from the hard thermal loop (HTL) perturbation theory. Moreover, the indication of poor convergence in the next-to-leading order (NLO) perturbative analysis has motivated the development of several approaches to incorporate the non-perturbative effects in the heavy quark phenomenology. In this work, we estimate the heavy quark diffusion coefficient based on the Gribov-Zwanziger prescription. In this framework, the gluon propagator depends on the temperature-dependent Gribov mass parameter, which has been obtained self-consistently from the one-loop gap equation. Incorporating this modified gluon propagator in the analysis, we find a reasonable agreement with the existing lattice estimations of $κ$ within the model uncertainties.
description: 9 pages, 3 figures, published version
Conventional high-temperature superconductivity in metallic, covalently bonded, binary-guest C-B clathrates
Creators: name: Geng, Nisha
name: Hilleke, Katerina P.
name: Zhu, Li
name: Wang, Xiaoyu
name: Strobel, Timothy A.
name: Zurek, Eva
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Inspired by the synthesis of XB3C3 (X= Sr, La) compounds in the bipartite sodalite clathrate structure, density functional theory (DFT) calculations are performed on members of this family containing up to two different metal atoms. A DFT-chemical pressure analysis on systems with X= Mg, Ca, Sr, Ba reveals that the size of the metal cation, which can be tuned to stabilize the B-C framework, is key for their ambient-pressure dynamic stability. High-throughput density functional theory calculations on 105 Pm-3 symmetry XYB6C6 binary-guest compounds (where X, Y are electropositive metal atoms) find 22 that are dynamically stable at 1 atmosphere, expanding the number of potentially synthesizable phases by 19 (18 metals and 1 insulator). The density of states at the Fermi level and superconducting critical temperature, Tc, can be tuned by changing the average oxidation state of the metal atoms, with Tc being highest for an average valence of +1.5. KPbB6C6, with an ambient-pressure Eliashberg Tc of 88 K, is predicted to possess the highest-Tc among the studied Pm-3n XB3C3 or Pm-3 XY B6C6 phases, and calculations suggest it may be synthesized using high-pressure high-temperature techniques then quenched to ambient conditions.
Very-long-baseline interferometry study of the flaring blazar TXS 1508+572 in the early Universe
Creators: name: Benke, P.
name: Gokus, A.
name: Lisakov, M.
name: Gurvits, L. I.
name: Eppel, F.
name: Heßdörfer, J.
name: Kadler, M.
name: Kovalev, Y. Y.
name: Ros, E.
name: Rösch, F.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: High-redshift blazars provide valuable input to studies of the evolution of active galactic nuclei (AGN) jets and provide constraints on cosmological models. Detections at high energies ($0.1<\mathrm{E}<100$ GeV) of these distant sources are rare, but when they exhibit bright gamma-ray flares, we are able to study them. However, contemporaneous multi-wavelength observations of high-redshift objects ($z>4$) during their different periods of activity have not been carried out so far. An excellent opportunity for such a study arose when the blazar TXS 1508+572 ($z=4.31$) exhibited a $γ$-ray flare in 2022 February in the $0.1-300$ GeV range with a flux 25 times brighter than the one reported in the in the fourth catalog of the \textit{Fermi} Large Area Telescope. Our goal is to monitor the morphological changes, spectral index and opacity variations that could be associated with the preceding $γ$-ray flare in TXS 1508+572 to find the origin of the high-energy emission in this source. We also plan to compare the source characteristics in the radio band to the blazars in the local Universe ($z<0.1$). In addition, we aim to collect quasi-simultaneous data to our multi-wavelength observations of the object, making TXS 1508+572 the first blazar in the early Universe ($z>4$) with contemporaneous multi-frequency data available in its high state. In order to study the parsec-scale structure of the source, we performed three epochs of very-long-baseline interferometry (VLBI) follow-up observations with the Very Long Baseline Array (VLBA) supplemented with the Effelsberg 100-m Telescope at 15, 22, and 43 GHz, which corresponds to 80, 117, and 228 GHz in the rest frame of TXS 1508+572. In addition, one 86 GHz (456 GHz) measurement was performed by the VLBA and the Green Bank Telescope during the first epoch.
Big rip in shift-symmetric Kinetic Gravity Braiding theories
Creators: name: Vasilev, Teodor Borislavov
name: Bouhmadi-López, Mariam
name: Martín-Moruno, Prado
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We revise the future fate of a group of scalar-tensor theories known as kinetic gravity braiding models. As it is well-known, these theories can safely drive the expansion of the universe towards a future de Sitter state if the corresponding Lagrangian is invariant under constant shifts in the scalar field. However, this is not the only possible future state of these shift-symmetric models as we show in this letter. In fact, future cosmic singularities characterized by a divergence of the energy density can also appear in this framework. We present an explicit example where a big rip singularity is the only possible future fate of the cosmos.
description: 6 pages, 2 figures, 1 table. v2: minor modifications in the conclusions section, no physics changes, matches PLB published version
Multiwavelength optical properties of compact dust aggregates in protoplanetary disks
Creators: name: Min, M.
name: Rab, Ch.
name: Woitke, P.
name: Dominik, C.
name: Ménard, F.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In protoplanetary disks micron-size dust grains coagulate to form larger structures with complex shapes and compositions. The coagulation process changes the absorption and scattering properties of particles in the disk in significant ways. To properly interpret observations of protoplanetary disks and to place these observations in the context of the first steps of planet formation, it is crucial to understand the optical properties of these complex structures. We derive the optical properties of dust aggregates using detailed computations of aggregate structures and compare these computa- tionally demanding results with approximate methods that are cheaper to compute in practice. In this way we wish to understand the merits and problems of approximate methods and define the context in which they can or cannot be used to analyze observations of objects where significant grain growth is taking place. For the detailed computations we used the discrete dipole approximation (DDA), a method able to compute the interaction of light with a complexly shaped, inhomogeneous particle. We compared the results to those obtained using spherical and irregular, homogeneous and inhomogeneous particles. While no approximate method properly reproduces all characteristics of large dust aggregates, the thermal properties of dust can be analyzed using irregularly shaped, porous, inhomogeneous grains. The asymmetry of the scattering phase function is a good indicator of aggregate size, while the degree of polarization is probably determined by the size of the constituent particles. Optical properties derived from aggregates significantly differ from the most frequently used standard ("astronomical silicate" in spherical grains). We outline a computationally fast and relatively accurate method that can be used for a multiwavelength analysis of aggregate dust in protoplanetary disks.
description: Accepted for publication in A&A
การศึกษาแนวโน้มความต้องการศึกษาต่อในสาขาวิชาเทคโนโลยีพลังงานและสิ่งแวดล้อม ระดับปริญญาตรีของนักเรียนมัธยมปลายหรือเทียบเท่า
Creators: name: กนิษฐา   สัฏชนะ
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: ความต้องการศึกษาต่อสาขาวิชาเทคโนโลยีพลังงานและสิ่งแวดล้อม

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 2, 92
Relaxation and fluctuations of a mass- and dipole-conserving stochastic lattice gas
Creators: name: Meerson, Baruch
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Han et al. [Phys. Rev. Lett. \textbf{132}, 137102 (2024)] have recently introduced a classical stochastic lattice gas model which, in addition to particle conservation, also conserves the particles' dipole moment. Because of its intrinsic nonlinearity this model exhibits unusual macroscopic scaling behaviors, different from those of lattice gases that conserve only the number of particles. Here we investigate some basic relaxation and fluctuation properties of this model at large scales and at long times. These properties crucially depend on whether the total number of particles is infinite or finite. We find similarity solutions, describing relaxation of the dipole-conserving gas (DCG) in several standard settings. A major part of our effort is an extension to this model of the macroscopic fluctuation theory (MFT), previously developed for lattice gases where only the number of particles is conserved. We apply the MFT to the calculation of the variance of nonequilibrium fluctuations of the excess number of particles on the positive semi-axis when starting from an (either deterministic, or random) constant density at $t=0$. Using the MFT, we also identify the equilibrium Boltzmann-Gibbs distribution for the DCG. Finally, based on these results, we determine the probability distribution of, and the most probable density history leading to, a large deviation in the form of a macroscopic void of a given size in an initially uniform DCG at equilibrium.
description: 10 pages, 4 figures
การออกแบบและพัฒนาผลิตภัณฑ์ชุมชน: อาหารและสมุนไพร
Creators: name: ฒวีพร โตวนิช
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: การออกแบบ
การพัฒนาผลิตภัณฑ์
ผลิตภัณฑ์ชุมชน
อาหาร
สมุนไพร

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 1, 55
Neural Networks Assisted Metropolis-Hastings for Bayesian Estimation of Critical Exponent on Elliptic Black Hole Solution in 4D Using Quantum Perturbation Theory
Creators: name: Hatefi, Armin
name: Hatefi, Ehsan
name: Lopez-Sastre, Roberto J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is well-known that the critical gravitational collapse produces continuous self-similar solutions characterized by the Choptuik critical exponent, $γ$. We examine the solutions in the domains of the linear perturbation equations, considering the numerical measurement errors. Specifically, we study quantum perturbation theory for the four-dimensional Einstein-axion-dilaton system of the elliptic class of $\text{SL}(2,\mathbb{R})$ transformations. We develop a novel artificial neural network-assisted Metropolis-Hastings algorithm based on quantum perturbation theory to find the distribution of the critical exponent in a Bayesian framework. Unlike existing methods, this new probabilistic approach identifies the available deterministic solution and explores the range of physically distinguishable critical exponents that may arise due to numerical measurement errors.
description: V3: 37 pages, 14 figures and the Version 2 has been accepted for publication in JCAP
ความสวยงามวางนัยทั่วไป : ผลบวกของผลคูณของจำนวนเต็มหนึ่งกับเลขโดด 9 กับผลบวกของจำนวนเต็มเดียวกันกับเลขโดด 9
Creators: name: ปฏิภาน พรหมรักษ์
Publisher: name: มหาวิทยาลัยราชภัฏกาญจนบุรี
Year: 2558
Subjects: หลักการอุปนัยเชิงคณิตศาสตร์
ผลคูณ
จำนวนเศษเหลือ
ผลบวก

description: วารสารวิชาการมหาวิทยาลัยราชภัฏกาญจนบุรี, 4, 1, 110