cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Transverse target spin asymmetry in inclusive DIS with two-photon exchange
Creators: name: Afanasev, A.
name: Strikman, M.
name: Weiss, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the transverse target spin dependence of the cross section for inclusive electron-nucleon scattering with unpolarized beam. Such dependence is absent in the one-photon exchange approximation (Christ-Lee theorem) and arises only in higher orders of the QED expansion, from the interference of one-photon and absorptive two-photon exchange amplitudes as well as from real photon emission (bremsstrahlung). We demonstrate that the transverse spin-dependent two-photon exchange cross section is free of QED infrared and collinear divergences. We argue that in DIS kinematics the transverse spin dependence should be governed by a "parton-like" mechanism in which the two-photon exchange couples mainly to a single quark. We calculate the normal spin asymmetry in an approximation where the dominant contribution arises from quark helicity flip due to interactions with non-perturbative vacuum fields (constituent quark picture) and is proportional to the quark transversity distribution in the nucleon. Such helicity-flip processes are not significantly Sudakov-suppressed if the infrared scale for gluon emission in the photon-quark subprocess is of the order of the chiral symmetry breaking scale, mu_chiral^2 >> Lambda_QCD^2. We estimate the asymmetry in the kinematics of the planned Jefferson Lab Hall A experiment to be of the order 10^{-4}, with different sign for proton and neutron. We also comment on the spin dependence in the limit of soft high-energy scattering.
description: 22 pages, 14 figures; uses revtex4
MOND and the mass discrepancies in tidal dwarf galaxies
Creators: name: Milgrom, Mordehai
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I consider in light of MOND the three debris galaxies discussed recently by Bournaud et al.. These exhibit mass discrepancies of a factor of a few within several scale lengths of the visible galaxy, which, arguably, flies in the face of the cold dark matter paradigm. I show here that the rotational velocities predicted by MOND agree well with the observed velocities for each of the three galaxies, with only the observed baryonic matter as the source of gravity. There is thus no need to invoke a new form of baryonic, yet-undetected matter that dominates the disc of spiral galaxies, as advocated by Bournaud et al. I argue on other grounds that the presence of such ubiquitous disc dark matter, in addition to cold dark matter, is not likely.
description: 9 pages, 1 figure. Changed to agree with the version to be published in Astrophys. J. Lett
ParSNIP: Generative Models of Transient Light Curves with Physics-Enabled Deep Learning
Creators: name: Boone, Kyle
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a novel method to produce empirical generative models of all kinds of astronomical transients from datasets of unlabeled light curves. Our hybrid model, that we call ParSNIP, uses a neural network to model the unknown intrinsic diversity of different transients and an explicit physics-based model of how light from the transient propagates through the universe and is observed. The ParSNIP model predicts the time-varying spectra of transients despite only being trained on photometric observations. With a three-dimensional intrinsic model, we are able to fit out-of-sample multiband light curves of many different kinds of transients with model uncertainties of 0.04-0.06 mag. The representation learned by the ParSNIP model is invariant to redshift, so it can be used to perform photometric classification of transients even with heavily biased training sets. Our classification techniques significantly outperform state-of-the-art methods on both simulated (PLAsTiCC) and real (PS1) datasets with 2.3$\times$ and 2$\times$ less contamination respectively for classification of Type~Ia supernovae. We demonstrate how our model can identify previously-unobserved kinds of transients and produce a sample that is 90% pure. The ParSNIP model can also estimate distances to Type Ia supernovae in the PS1 dataset with an RMS of 0.150 $\pm$ 0.007 mag compared to 0.155 $\pm$ 0.008 mag for the SALT2 model on the same sample. We discuss how our model could be used to produce distance estimates for supernova cosmology without the need for explicit classification.
description: 27 pages, 17 figures, accepted for publication in AJ
Distributional Robustness Regularized Scenario Optimization with Application to Model Predictive Control
Creators: name: Nemmour, Yassine
name: Schölkopf, Bernhard
name: Zhu, Jia-Jie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: We provide a functional view of distributional robustness motivated by robust statistics and functional analysis. This results in two practical computational approaches for approximate distributionally robust nonlinear optimization based on gradient norms and reproducing kernel Hilbert spaces. Our method can be applied to the settings of statistical learning with small sample size and test distribution shift. As a case study, we robustify scenario-based stochastic model predictive control with general nonlinear constraints. In particular, we demonstrate constraint satisfaction with only a small number of scenarios under distribution shift.
Call for Papers: Mulheres Exaustas na Contemporaneidade
Creators: name: Guimarães, Ludmila de Vasconcelos M.
name: Maca, Deidi
name: Oliveira, Josiane Silva de
name: Ferraz, Janaynna de Moura
name: Sarayed-Din, Luiza Farnese Lana
name: Poleto, Oltramari Andrea
Publisher: name: Zenodo
Year: 2021
Subjects: contemporaneidade
contemporaneidad
contemporary
mulheres exaustas
mujeres agotadas
exhausted women
call for papers
Revista de Administração Contemporânea
Journal of Contemporary Administration

description: Leia a chamada completa em Português no PDF abaixo. Para demonstrar seu interesse em atuar como avaliadora das submissões da chamada, preencha o formulário ao final. Lea la convocatoria completa en español en el PDF a continuación. Para demostrar su interés en actuar como evaluadora de los artículos de la convocatoria, complete el formulario al final. Read the full call for papers in English in the PDF below. To demonstrate your interest in acting as a reviewer of the submissions, please complete the form at the end. Form: https://forms.office.com/r/w5iN0JgmMr Video: https://youtu.be/WPWgg-Sz0G8 Live/Conversatorio/Debate: https://youtu.be/efHmb9yOfBs
Towards a Higgs mass determination in asymptotically safe gravity with a dark portal
Creators: name: Eichhorn, Astrid
name: Pauly, Martin
name: Ray, Shouryya
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: There are indications that an asymptotically safe UV completion of the Standard Model with gravity could constrain the Higgs self-coupling, resulting in a prediction of the Higgs mass close to the vacuum stability bound in the Standard Model. The predicted value depends on the top quark mass and comes out somewhat higher than the experimental value if the current central value for the top quark mass is assumed. Beyond the Standard Model, the predicted value also depends on dark fields coupled through a Higgs portal. Here we study the Higgs self-coupling in a toy model of the Standard Model with quantum gravity that we extend by a dark scalar and fermion. Within the approximations used in arXiv:2005.03661 , there is a single free parameter in the asymptotically safe dark sector, as a function of which the predicted (toy model) Higgs mass can be lowered due to mixing effects if the dark sector undergoes spontaneous symmetry breaking.
description: 23 pages, 11 figures
Adaptive approximate Bayesian computation
Creators: name: Beaumont, Mark A.
name: Cornuet, Jean-Marie
name: Marin, Jean-Michel
name: Robert, Christian P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: Sequential techniques can enhance the efficiency of the approximate Bayesian computation algorithm, as in Sisson et al.'s (2007) partial rejection control version. While this method is based upon the theoretical works of Del Moral et al. (2006), the application to approximate Bayesian computation results in a bias in the approximation to the posterior. An alternative version based on genuine importance sampling arguments bypasses this difficulty, in connection with the population Monte Carlo method of Cappe et al. (2004), and it includes an automatic scaling of the forward kernel. When applied to a population genetics example, it compares favourably with two other versions of the approximate algorithm.
description: 8 pages, 2 figures, one algorithm, third revised resubmission to Biometrika
Band gap measurements of monolayer h-BN and insights into carbon-related point defects
Creators: name: Román, Ricardo Javier Peña
name: Costa, Fábio J R Costa
name: Zobelli, Alberto
name: Elias, Christine
name: Valvin, Pierre
name: Cassabois, Guillaume
name: Gil, Bernard
name: Summerfield, Alex
name: Cheng, Tin S
name: Mellor, Christopher J
name: Beton, Peter H
name: Novikov, Sergei V
name: Zagonel, Luiz F
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Being a flexible wide band gap semiconductor, hexagonal boron nitride (h-BN) has great potential for technological applications like efficient deep ultraviolet light sources, building block for two-dimensional heterostructures and room temperature single photon emitters in the ultraviolet and visible spectral range. To enable such applications, it is mandatory to reach a better understanding of the electronic and optical properties of h-BN and the impact of various structural defects. Despite the large efforts in the last years, aspects such as the electronic band gap value, the exciton binding energy and the effect of point defects remained elusive, particularly when considering a single monolayer. Here, we directly measured the density of states of a single monolayer of h-BN epitaxially grown on highly oriented pyrolytic graphite, by performing low temperature scanning tunneling microscopy (STM) and spectroscopy (STS). The observed h-BN electronic band gap on defect-free regions is $(6.8\pm0.2)$ eV. Using optical spectroscopy to obtain the h-BN optical band gap, the exciton binding energy is determined as being of $(0.7\pm0.2)$ eV. In addition, the locally excited cathodoluminescence and photoluminescence show complex spectra that are typically associated to intragap states related to carbon defects. Moreover, in some regions of the monolayer h-BN we identify, using STM, point defects which have intragap electronic levels around 2.0 eV below the Fermi level.
description: 50 Pages, 8 Figures, 100+ references
Coupling video vision transformer (ViVit) into land change simulation: a comparison with three-dimensional convolutional neural network (3DCNN)
Creators: name: Li, Haiyang
name: Fan, Liang
name: Gao, Yifan
name: Liu, Zhao
name: Gao, Peichao
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Space Science
subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified

description: To enhance land use/cover change (LUCC) simulation accuracy, we introduced ViViT-ANN-CA, blending video vision transformer’s spatio-temporal features extraction ability, artificial neural network‘s (ANN) non-linearity computing ability, and CA’s spatial computing. Compared to 3DCNN-ANN-CA, ViViT-ANN-CA showed higher accuracy in simulating water bodies and vegetation, with overall improvements in Hailing District and Wuxi City. ViViT demonstrates comparable spatio-temporal feature extraction ability to three-dimensional convolutional neural network (3DCNN), promising for future ynamic LUCC simulations.
Octet lattice-based plate for elastic wave control
Creators: name: Aguzzi, Giulia
name: Kanellopoulos, Constantinos
name: Wiltshaw, Richard
name: Craster, Richard V.
name: Chatzi, Eleni N.
name: Colombi, Andrea
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Motivated by the importance of lattice structures in multiple fields, we investigate the propagation of flexural waves in a thin woven plate augmented with two classes of metastructures for wave mitigation and guiding, namely metabarriers and metalenses. The cellular architecture of this plate invokes the well-known octet topology, while the metadevices rely on novel customized octets either comprising spherical masses added to the midpoint of their struts or variable node thickness. We numerically determine the dispersion curves of a doubly-periodic array of octets, which produce a broad bandgap whose underlying physics is elucidated and leveraged as a design paradigm, allowing the construction of a metabarrier effective for inhibiting the transmission of waves. More sophisticated effects emerge upon parametric analyses of the added masses and node thickness, leading to graded designs that spatially filter waves through an enlarged bandgap via rainbow trapping. Additionally, Luneburg and Maxwell metalenses are realized using the spatial modulation of the tuning parameters and numerically tested. Wavefronts impinging on these structures are progressively curved within the inhomogeneous media and steered toward a focal point. Our results yield new perspectives for the use of octet-like lattices, paving the way for promising applications in vibration isolation and energy focusing.
Optically induced electrostriction modes in a nanoparticle of a uniformly charged electret
Creators: name: Bastrukov, Sergey
name: Molodtsova, Irina
name: Lai, Pik-Yin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The electromagnetic response of a nanoparticle of an ion-doped polymeric elastic insulator, commonly called as an electret, is considered in the continuum model of a uniformly charged elastic sphere. The spectral formulae for the frequency of optically induced spheroidal and torsional shear oscillations driven by bulk force of elastic and dielectric stresses are obtained in analytic form. Particular attention is given to relaxation dielectric mode of the electrostriction response and its stability in the lowest quadrupole mode. The practical usefulness of ultrafine particles of electrets as a biolabels capable of accumulating likely-charged inclusions uniformly dispersed over the spherical volume of an elastic matrix is briefly discussed.
description: International Journal of Nanoscience, 2008, Vol.7, No.6, pp.291-298
A cold-start recommendation method for We-map considering co-occurrence collaborative signals and contrastive learning
Creators: name: Ma, Wenjun
name: Yan, Haowen
name: Li, Jingzhong
name: Wang, Xiaolong
name: Wang, Zhuo
name: Yang, Qili
name: Fu, Xuan
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Physiology
subject: Environmental Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: Mental Health
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: Virology

description: We-maps, augmenting traditional maps, confront cold-start problems with prevailing recommendation techniques. The Contrastive Collaborative Filtering (CCF) model tackles We-map's cold-start issues by harnessing co-occurrence signals from warm data in a contrastive framework, thereby refining embeddings through the integration of content and co-occurrence insights. This methodology engenders unique embeddings for We-map entities, utilizing contrastive learning to bridge semantic gaps and enable indirect knowledge transfer, effectively mitigating cold-start challenges. Experimental validation on We-map and various public datasets confirms the method's practicality in addressing cold-start recommendations for We-maps. The study offers a new path for efficient geospatial data dissemination.
Local complementation rule for continuous-variable four-mode unweighted graph states
Creators: name: Zhang, Jing
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The local complementation rule is applied for continuous-variable (CV) graph states in the paper, which is an elementary graph transformation rule and successive application of which generates the orbit of any graph states. The corresponding local Gaussian transformations of local complementation for four-mode unweighted graph states were found, which do not mirror the form of the local Clifford unitary of qubit exactly. This work is an important step to characterize the local Gaussian equivalence classes of CV graph states.
description: 4 pages, 4 figures, appear in Phys. Rev. A
Laser-ablation-assisted SF6 decomposition for extensive and controlled fluorination of graphene
Creators: name: Plsek, Jan
name: Drogowska, Karolina Anna
name: Fridrichov, Michaela
name: Vejpravova, Jana
name: Kalbac, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a safe, clean, convenient, and easy-to-control method for extensive fluorination of graphene using laser-ablation-assisted decomposition of gaseous SF6 molecules.
The TQ equation of the 8 vertex model for complex elliptic roots of unity
Creators: name: Fabricius, Klaus
name: McCoy, Barry M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We extend our studies of the TQ equation introduced by Baxter in his 1972 solution of the 8 vertex model with parameter $η$ given by $2Lη=2m_1K+im_2K'$ from $m_2=0$ to the more general case of complex $η.$ We find that there are several different cases depending on the parity of $m_1$ and $m_2$.
description: 30 pages, LATEX
Chandra Observations of the Gamma-ray Binary LSI+61303: Extended X-ray Structure?
Creators: name: Paredes, J. M.
name: Ribo, M.
name: Bosch-Ramon, V.
name: West, J. R.
name: Butt, Y. M.
name: Torres, D. F.
name: Marti, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a 50 ks observation of the gamma-ray binary LSI+61303 carried out with the ACIS-I array aboard the Chandra X-ray Observatory. This is the highest resolution X-ray observation of the source conducted so far. Possible evidence of an extended structure at a distance between 5 and 12 arcsec towards the North of LSI+61303 have been found at a significance level of 3.2 sigma. The asymmetry of the extended emission excludes an interpretation in the context of a dust-scattered halo, suggesting an intrinsic nature. On the other hand, while the obtained source flux, of F_{0.3-10 keV}=7.1^{+1.8}_{-1.4} x 10^{-12} ergs/cm^2/s, and hydrogen column density, N_{H}=0.70+/-0.06 x 10^{22} cm^{-2}, are compatible with previous results, the photon index Gamma=1.25+/-0.09 is the hardest ever found. In light of these new results, we briefly discuss the physics behind the X-ray emission, the location of the emitter, and the possible origin of the extended emission ~0.1 pc away from LSI+61303.
description: 4 pages, 3 figures. Accepted for publication in ApJ Letters
Analytical results for the distribution of cover times of random walks on random regular graphs
Creators: name: Tishby, Ido
name: Biham, Ofer
name: Katzav, Eytan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present analytical results for the distribution of cover times of random walks (RWs) on random regular graphs consisting of $N$ nodes of degree $c$ ($c \ge 3$). Starting from a random initial node at time $t=1$, at each time step $t \ge 2$ an RW hops into a random neighbor of its previous node. In some of the time steps the RW may visit a new, yet-unvisited node, while in other time steps it may revisit a node that has already been visited before. The cover time $T_{\rm C}$ is the number of time steps required for the RW to visit every single node in the network at least once. We derive a master equation for the distribution $P_t(S=s)$ of the number of distinct nodes $s$ visited by an RW up to time $t$ and solve it analytically. Inserting $s=N$ we obtain the cumulative distribution of cover times, namely the probability $P(T_{\rm C} \le t) = P_t(S=N)$ that up to time $t$ an RW will visit all the $N$ nodes in the network. Taking the large network limit, we show that $P(T_{\rm C} \le t)$ converges to a Gumbel distribution. We calculate the distribution of partial cover (PC) times $P( T_{{\rm PC},k} = t )$, which is the probability that at time $t$ an RW will complete visiting $k$ distinct nodes. We also calculate the distribution of random cover (RC) times $P( T_{{\rm RC},k} = t )$, which is the probability that at time $t$ an RW will complete visiting all the nodes in a subgraph of $k$ randomly pre-selected nodes at least once. The analytical results for the distributions of cover times are found to be in very good agreement with the results obtained from computer simulations.
description: 47 pages, 11 figures. arXiv admin note: text overlap with arXiv:2102.12195, arXiv:2106.10449
A Bayesian test for excess zeros in a zero-inflated power series distribution
Creators: name: Bhattacharya, Archan
name: Clarke, Bertrand S.
name: Datta, Gauri S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62F15, 62F03 (Primary) 62F05 (Secondary)

description: Power series distributions form a useful subclass of one-parameter discrete exponential families suitable for modeling count data. A zero-inflated power series distribution is a mixture of a power series distribution and a degenerate distribution at zero, with a mixing probability $p$ for the degenerate distribution. This distribution is useful for modeling count data that may have extra zeros. One question is whether the mixture model can be reduced to the power series portion, corresponding to $p=0$, or whether there are so many zeros in the data that zero inflation relative to the pure power series distribution must be included in the model i.e., $p\geq0$. The problem is difficult partially because $p=0$ is a boundary point. Here, we present a Bayesian test for this problem based on recognizing that the parameter space can be expanded to allow $p$ to be negative. Negative values of $p$ are inconsistent with the interpretation of $p$ as a mixing probability, however, they index distributions that are physically and probabilistically meaningful. We compare our Bayesian solution to two standard frequentist testing procedures and find that using a posterior probability as a test statistic has slightly higher power on the most important ranges of the sample size $n$ and parameter values than the score test and likelihood ratio test in simulations. Our method also performs well on three real data sets.
description: Published in at http://dx.doi.org/10.1214/193940307000000068 the IMS Collections (http://www.imstat.org/publications/imscollections.htm) by the Institute of Mathematical Statistics (http://www.imstat.org)
The Distribution and Origin of C$_2$H in NGC 253 from ALCHEMI
Creators: name: Holdship, J.
name: Viti, S.
name: Martín, S.
name: Harada, N.
name: Mangum, J.
name: Sakamoto, K.
name: Muller, S.
name: Tanaka, K.
name: Yoshimura, Y.
name: Nakanishi, K.
name: Herrero-Illana, R.
name: Mühle, S.
name: Aladro, R.
name: Colzi, L.
name: Emig, K. L.
name: García-Burillo, S.
name: Henkel, C.
name: Humire, P.
name: Meier, D. S.
name: Rivilla, V. M.
name: van der Werf, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Observations of chemical species can provide an insight into the physical conditions of the emitting gas but it is important to understand how their abundances and excitation vary within different heating environments. C$_2$H is a molecule typically found in PDR regions of our own Galaxy but there is evidence to suggest it also traces other regions undergoing energetic processing in extragalactic environments. As part of the ALCHEMI ALMA large program, the emission of C$_2$H in the central molecular zone of the nearby starburst galaxy NGC 253 was mapped at 1.6 " (28 pc) resolution and characterized to understand its chemical origins. Spectral modelling of the N=1-0 through N=4-3 rotational transitions of C$_2$H was used to derive the C$_2$H column densities towards the dense clouds in NGC 253. Chemical modelling, including PDR, dense cloud, and shock models were then used to investigate the chemical processes and physical conditions that are producing the molecular emission. We find high C$_2$H column densities of $\sim 10^{15} cm^{-3}$ detected towards the dense regions of NGC 253. We further find that these column densities cannot be reproduced by assuming that the emission arises from the PDR regions at the edge of the clouds. Instead, we find that the C$_2$H abundance remains high even in the high visual extinction interior of these clouds and that this is most likely caused by a high cosmic-ray ionization rate.
description: 18 pages, 13 figures, accepted for publication in A&A
Torelli theorem for the moduli space of framed bundles
Creators: name: Biswas, Indranil
name: Gomez, Tomas L.
name: Muñoz, Vicente
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14D22; 14D20

description: Let X be an irreducible smooth complex projective curve of genus g>2, and let x be a fixed point. A framed bundle is a pair (E,ϕ), where E is a vector bundle over X, of rank r and degree d, and ϕ:E_x\to C^r is a non-zero homomorphism. There is a notion of (semi)stability for framed bundles depending on a parameter τ>0, which gives rise to the moduli space of τ-semistable framed bundles M^τ. We prove a Torelli theorem for M^τ, for τ>0 small enough, meaning, the isomorphism class of the one-pointed curve (X,x), and also the integer r, are uniquely determined by the isomorphism class of the variety M^τ.
description: 12 pages
Photoelectrocatalytic detection of NADH on n-type silicon semiconductors facilitated by carbon nanotube fibers
Creators: name: del Barrio, Melisa
name: Rana, Moumita
name: Vilatela, Juan José
name: Lorenzo, Encarnación
name: De Lacey, Antonio L.
name: Pita, Marcos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: NADH is a key biomolecule involved in many biocatalytic processes as cofactor and its quantification can be correlated to specific enzymatic activity. Many efforts have been taken to obtain clean electrochemical signals related to NADH presence and lower its redox overpotential to avoid interferences. Suppression of background and secondary signals can be achieved by including a switchable electroactive surface, for instance, by using semiconductors able to harvest light energy and drive the excited electrons only when irradiated. Here we present the combination of a n-type Si semiconductor with fibers made of carbon nanotubes as electroactive surface for NADH quantification at low potentials only upon irradiation. The resulting photoelectrode responded linearly to NADH concentrations from 50 μ M to 1.6 mM with high sensitivity (54 $μ$ A cm$^{-2}$ mM${-1}$). This system may serve as a biosensing platform for detection and quantification of dehydrogenases activity.
Mapping the 3D Kinematical Structure of the Gas Disk of HD 169142
Creators: name: Yu, Haochuan
name: Teague, Richard
name: Bae, Jaehan
name: Öberg, Karin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The disk around HD 169142 has been suggested to host multiple embedded planets due to the range of structures observed in the dust distributions. We analyze archival ALMA observations of $^{12} \mathrm{CO \ (2-1)}$, $^{13} \mathrm{CO \ (2-1)}$, and $\mathrm{C}^{18} \mathrm{O \ (2-1)}$ to search for large-scale kinematic structures associated with other embedded planets in the outer disk. At 125 au, we identify a coherent flow from the disk surface to the midplane, traced by all three CO isotopologues, and interpret it as a meridional flow, potentially driven by an embedded planet. We use changes in the rotation speed of the gas to characterize the physical structure across this region, finding that at 125 au the CO emission traces regions of increased gas pressure, despite being at a surface density minimum. Developing a simple analytical model, we demonstrate that the physical structure of the gap can have non-trivial responses to changes in the surface density, consistent both with previous thermo-chemical models, and the conditions inferred observationally. Applying this technique to a range of sources will allow us to directly confront theoretical models of gap-opening in protoplanetary disks.
description: 23 pages, 17 figures, accepted for publication in ApJL
The hydrodynamical relevance of the Camassa-Holm and Degasperis-Procesi equations
Creators: name: Constantin, Adrian
name: Lannes, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In recent years two nonlinear dispersive partial differential equations have attracted a lot of attention due to their integrable structure. We prove that both equations arise in the modeling of the propagation of shallow water waves over a flat bed. The equations capture stronger nonlinear effects than the classical nonlinear dispersive Benjamin-Bona-Mahoney and Korteweg-de Vries equations. In particular, they accomodate wave breaking phenomena.
Territorial aggression among males of three syrphid species
Creators: name: Fitzpatrick, Sheila M.
Publisher: name: University of British Columbia
Year: 2010

description: Among territorial syrphids, Eumerus tuberculatus (Rond.) males are always less aggressive than Merodon equestris (Fab.) and Eristalis tenax (L.) males. This aggressive gradient is maintained despite the fact that the aggressive intensity of all three species increases with the density of conspecifies, varies with insect age and stage, and ceases if temperatures fall below a certain critical level or if sunlight disappears. Possible reasons for the difference in the inherent level of aggression are discussed. Males of all three species recognized conspecifie females through a combination of visual and behavioural cues. A territorial male approached all other intruders aggressively but attempted to mate with them if, like females, the intruders did not respond to the male's approach. Differences in behaviour patterns among species are tentatively traced to different energy budgets and mating strategies. Within each species, males and females show different temperature thresholds for activity. This finding is discussed in terms of energy requirements and reserves. The final two sections of the thesis deal with the agricultural implications of these results and with possibilities for future studies.
On the spectrum of the twisted Dolbeault Laplacian over Kähler manifolds
Creators: name: Jardim, Marcos
name: Leao, Rafael F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58C40; 32L07; 58J50

description: We use Dirac operator techniques to a establish sharp lower bound for the first eigenvalue of the Dolbeault Laplacian twisted by Hermitian-Einstein connections on vector bundles of negative degree over compact Kähler manifolds.
description: 14 pages. Completely revised: estimates corrected and shown to be sharp
Who are the male partners of adolescent girls and young women in Swaziland? Analysis of survey data from community venues across 19 DREAMS districts
Creators: name: Luben, Erin
name: Reynolds, Zahra
name: Gottert, Ann
name: Mamba, Bheki
name: Shabangu, Patrick
name: Mathur, Sanyukta
name: Pulerwitz, Julie
name: Dlamini, Nsindiso
name: Dlamini, Muhle
Publisher: name: Public Library of Science (PLoS)
Year: 2018

description:
BACKGROUND: Adolescent girls and young women (AGYW, ages 15-24) are at high risk of HIV in Swaziland. Understanding more about their male sexual partners can inform HIV prevention efforts for both. METHODS: Using the PLACE methodology across all 19 DREAMS implementation districts, 843 men ages 20-34 were surveyed between December 2016-February 2017. Surveys were conducted at 182 venues identified by community informants as places where AGYW and men meet/socialize. Descriptive and multivariate analyses examined characteristics and risk behaviors of male partners of AGYW. RESULTS: Men's average age was 25.7. Sixty-three percent reported female partners ages 15-19, and 70% reported partners ages 20-24 in the last year; of those, 12% and 11% respectively had five or more such partners. Among the 568 male partners of AGYW, 36% reported consistent condom use with their current/last partner. Forty-two percent reported testing for HIV in the last year; 6% were HIV-positive, and of those, 97% were currently on treatment. One-third (37%) reported being circumcised; among uncircumcised, 81% were not considering it. In multivariate analyses, men who reported three or more AGYW partners in the last year were more likely to be HIV-positive (aOR 3.2, 95% CI 1.1,8.8). Men were also less likely to disclose their HIV status to adolescent versus older partners (aOR 0.6, 95% CI 0.4,0.9) and partners more than 5 years younger than themselves (aOR 0.6, 95% CI 0.4,0.9). Results also revealed relatively high unemployment and mobility, substantial financial responsibilities, and periodic homelessness. CONCLUSIONS: Most men identified through community venues reported relationships with AGYW, and these relationships demonstrated substantial HIV risk. Challenging life circumstances suggest structural factors may underlie some risk behaviors. Engaging men in HIV prevention and targeted health services is critical, and informant-identified community venues are promising intervention sites to reach high-risk male partners of AGYW.
Cosmic Evolution of Stellar Disk Truncations: From z~1 to the Local Universe
Creators: name: Azzollini, Ruyman
name: Trujillo, Ignacio
name: Beckman, John E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have conducted the largest systematic search so far for stellar disk truncations in disk-like galaxies at intermediate redshift (z<1.1), using the Great Observatories Origins Deep Survey South (GOODS-S) data from the Hubble Space Telescope - ACS. Focusing on Type II galaxies (i.e. downbending profiles) we explore whether the position of the break in the rest-frame B-band radial surface brightness profile (a direct estimator of the extent of the disk where most of the massive star formation is taking place), evolves with time. The number of galaxies under analysis (238 of a total of 505) is an order of magnitude larger than in previous studies. For the first time, we probe the evolution of the break radius for a given stellar mass (a parameter well suited to address evolutionary studies). Our results suggest that, for a given stellar mass, the radial position of the break has increased with cosmic time by a factor 1.3+/-0.1 between z~1 and z~0. This is in agreement with a moderate inside-out growth of the disk galaxies in the last ~8 Gyr. In the same period of time, the surface brightness level in the rest-frame B-band at which the break takes place has increased by 3.3+/-0.2 mag/arcsec^2 (a decrease in brightness by a factor of 20.9+/-4.2). We have explored the distribution of the scale lengths of the disks in the region inside the break, and how this parameter relates to the break radius. We also present results of the statistical analysis of profiles of artificial galaxies, to assess the reliability of our results.
description: 22 pages, 14 figures, accepted for publication in ApJ. Figures 1, 3 and 6 have somehow downgraded resolution to match uploading requirements
Stability of AdS black strings
Creators: name: Delsate, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the recent developements in the stability problem and phase diagram for asymptotically locally $AdS$ black strings. First, we quickly review the case of locally flat black string before turning to the case of locally $AdS$ spacetimes.
description: 4 pages. Talk included in the 7th Friedmann Seminar, Joao Pessoa - Brazil
Écrire une nouvelle histoire du roman des Lumières ? Enjeux et opportunités des linked open data
Creators: name: Schöch, Christof
Publisher: name: Zenodo
Year: 2024

description: Christof Schöch, avec Maria Hinzmann, Julia Röttgermann, Tinghui Duan, Anne Klee et Matthias Bremm: "Écrire une nouvelle histoire du roman des Lumières ? Enjeux et opportunités des linked open data".  Colloque GREN-CRIHN « Nouvelles perspectives sur les éditions critiques ». Université de Montréal, Québec, Canada, 30 Sep 2024. – URL: https://dhtrier.quarto.pub/montreal
Giant Anisotropic in-Plane Thermal Conduction Induced by Anomalous Phonons in Nearly-Equilaterally Structured PdSe2
Creators: name: Wei, Bin
name: Liu, Junyan
name: Cai, Qingan
name: Alatas, Ahmet
name: said, Ayman H.
name: Li, Chen
name: Hong, Jiawang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: In two-dimensional materials, structure difference induces the difference in phonon dispersions, leading to the anisotropy of in-plane thermal transport. Here, we report an exceptional case in layered PdSe2, where the bonding, force constants, and lattice constants are nearly-equal along the in-plane crystallographic axis directions. The phonon dispersions show significant differences between the Gamma-X and Gamma-Y directions, leading to the anisotropy of in-plane thermal conductivity with a ratio up to 1.8. Such anisotropy is not only unexpected in equilaterally structured (in-plane) materials but also comparable to the record in the non-equilaterally structured material reported to date. By combining inelastic X-ray scattering and first-principles calculations, we attribute such anisotropy to the low-energy phonons along Gamma-X, in particular, their lower group velocities and "avoided-crossing" behavior. The different bucking structures between a- (zigzag-type) and b-axis (flat-type) are mainly responsible for the unique phonon dynamics properties of PdSe2. The present results illustrate the unusual thermal conduction mechanism of the equilaterally structured materials and provide valuable insights on thermal management in electronic devices.
description: 16 figures, 2 tables
Code-switching
Creators: name: Elwys De Stefani
name: Auer, Peter
Publisher: name: OSF
Year: 2022
Subjects: Conversation Analysis
Encyclopedia
Ethnomethodology
Interactional Linguistics

description: The term code-switching lacks a clear definition. It is used for all kinds of co-occurrences of different languages or varieties in a sentence and/or in conversation. A conversation-analytic (‘emic’) approach grounded in members’ methods needs to make sure which ‘codes’ are involved.
Microscopic calculation of the decay of Jaffe-Wilczek tetraquarks, and the Z(4433)
Creators: name: Cardoso, Marco
name: Bicudo, Pedro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Here the tetraquarks are studied a la Jaffe and Wilczek. The decay width is fully computed with a microscopic quark model, using the resonating group method.
description: 5 pages, 1 figure, presented in Scadron 70 Workshop on "scalar mesons and related topics"
THE EFFECTIVENESS OF POSTMODERN FEMINIST EMPOWERING COUNSELING FOR ABUSED WOMEN: A PERSPECTIVES OF THAI ABUSED WOMEN
Creators: name: Samaphorn Theinkaw
name: Somporn Rungreangkulkij
Publisher: name: Behavioral Science Research Institute,SWU.
Year: 2013
Subjects: abused women,postmodern feminist counseling,PFEC,empowerment

description: 1, 8, INTERNATIONAL JOURNAL OF BEHAVIORAL SCIENCE
ความหลากหลายทางพันธุกรรมของพืชสกุล Passiflora (Genetic Diversity in Passiflora spp.)
Creators: name: อนุรักษ์ โพธิ์เอี่ยม
Publisher: name: Genetics Society of Thailand
Year: 2013
Subjects: Passiflora spp., genetic diversity

description: S1 (Special Issue 1), S.1, Thai Journal of Genetics
Classes of exact Einstein-Maxwell solutions
Creators: name: Komathiraj, K.
name: Maharaj, S. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We find new classes of exact solutions to the Einstein-Maxwell system of equations for a charged sphere with a particular choice of the electric field intensity and one of the gravitational potentials. The condition of pressure isotropy is reduced to a linear, second order differential equation which can be solved in general. Consequently we can find exact solutions to the Einstein-Maxwell field equations corresponding to a static spherically symmetric gravitational potential in terms of hypergeometric functions. It is possible to find exact solutions which can be written explicitly in terms of elementary functions, namely polynomials and product of polynomials and algebraic functions. Uncharged solutions are regainable with our choice of electric field intensity; in particular we generate the Einstein universe for particular parameter values.
description: 16 pages, To appear in Gen. Relativ. Gravit
On the role of Type Ia supernovae in the second generation star formation in globular clusters
Creators: name: Lacchin, Elena
name: Calura, Francesco
name: Vesperini, Enrico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: By means of 3D hydrodynamic simulations, we study how Type Ia supernovae (SNe) explosions affect the star formation history and the chemical properties of second generation (SG) stars in globular clusters (GC). SG stars are assumed to form once first generation asymptotic giant branch (AGB) stars start releasing their ejecta; during this phase, external gas is accreted by the system and SNe Ia begin exploding, carving hot and tenuous bubbles. Given the large uncertainty on SNe Ia explosion times, we test two different values for the 'delay time'. We run two different models for the external gas density: in the low-density scenario with short delay time, the explosions start at the beginning of the SG star formation, halting it in its earliest phases. The external gas hardly penetrates the system, therefore most SG stars present extreme helium abundances (Y > 0.33). The low-density model with delayed SN explosions has a more extended SG star formation epoch and includes SG stars with modest helium enrichment. On the contrary, the high-density model is weakly affected by SN explosions, with a final SG mass similar to the one obtained without SNe Ia. Most of the stars form from a mix of AGB ejecta and pristine gas and have a modest helium enrichment. We show that gas from SNe Ia may produce an iron spread of $\sim 0.14$ dex, consistent with the spread found in about 20% of Galactic GCs, suggesting that SNe Ia might have played a key role in the formation of this sub-sample of GCs.
description: 19 pages, 12 figures, Accepted for publication in MNRAS
Large N Field Theory and AdS Tachyons
Creators: name: Pomoni, Elli
name: Rastelli, Leonardo
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In non-supersymmetric orbifolds of N =4 super Yang-Mills, conformal invariance is broken by the logarithmic running of double-trace operators -- a leading effect at large N. A tachyonic instability in AdS_5 has been proposed as the bulk dual of double-trace running. In this paper we make this correspondence more precise. By standard field theory methods, we show that the double-trace beta function is quadratic in the coupling, to all orders in planar perturbation theory. Tuning the double-trace coupling to its (complex) fixed point, we find conformal dimensions of the form 2 + i b, as formally expected for operators dual to bulk scalars that violate the stability bound. We also show that conformal invariance is broken in perturbation theory if and only if dynamical symmetry breaking occurs. Our analysis is applicable to a general large N field theory with vanishing single-trace beta functions.
description: 26 pages, 6 figures. v3: small changes, version published on JHEP6
Continuing Dynamical Systems in Homogeneous Cosmologies Through The Big Bang Singularity
Creators: name: Hoffmann, Joshua
Publisher: name: Lancaster University
Year: 2024

description: General Relativity is the most successful theory of gravity developed so
 far. Among its many successes lie just as many open questions. This thesis
 is concerned primarily with the description of cosmological dynamical
 systems within General Relativity. The Hawking-Penrose theorems have shown
 General Relativity contains, quite generically, singular solutions for
 which it is not possible to uniquely and deterministically evolve
 dynamical systems describing the cosmology through these singular points.
 Possibly the most well known example of a such a singular point in the
 spacetime manifold is the Big Bang. Most conventional approaches to
 resolving this singularity impose some kind of quantization of the
 gravitational field, as one expects quantum gravity effects to be relevant
 under such conditions. In this work, we argue that if one takes the
 relationalist point of view, initially developed by Barbour and Bertotti,
 in which the measurable dynamical variables are dimensionless ratios, it
 is possible to find a description of cosmological dynamical systems
 defined on a contact manifold rather than the typical symplectic manifold
 of geometric classical mechanics. The framework of contact-reduction is
 applied to FLRW, Bianchi I and Bianchi IX cosmologies. We show that in the
 relational, shape space description there exist unique solutions to the
 equations of motion describing the cosmological dynamical system that pass
 smoothly through the Big Bang singularity. We also present work on
 addressing fundamental issues with several classes of cosmological
 inflation models, with a particular emphasis on the Quartic Hilltop model.
 These models are typically investigated under assumptions that make them
 physically unviable. We show that relaxing these assumptions and
 accounting for how they exit inflation significantly alters their
 predictions of the spectral index and tensor-to-scalar ratio.