cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
FAUSST: bridging the gap between steel and fibre reinforced materials
Creators: name: Luterbacher, Rafael
name: Molter, Lars
name: Sumpf, André
name: Peters, Rigo
Publisher: name: Technologies for Lightweight Structures (TLS)
Year: 2018

description: Multi-material design is commonly used within lightweight applications to meet certain design constraints. One common challenge across the different industry fields is the joining of materials of different material classes. Bonding and mechanical joining are generally used to overcome this issue. However, in some application fields, such as in the shipbuilding industry, where the interest of applying fibre-reinforced materials is increasing, these processes are not currently feasible due to regulatory and current technical constraints. One potential solution is FAUSST, a textile based transition joint. FAUSST is a hybrid knitted fabric, which is composed of 100% steel on one side and on the other of 100% glass fibres. The steel side is welded to a flat steel and the transition element is subsequently integrated via lamination processes within a fibre-reinforced component. Afterwards, this component is e.g. joined to a steel structure by welding. Depending on the design of the transition element, loads of up to 120 kN per meter joint can be transferred in the presented design with an overlap length of only 10 mm. This transition element, therefore, may lead to more lightweight designs with smoother surfaces for aesthetical, aerodynamic or hydrodynamic surfaces.
description: Technologies for Lightweight Structures (TLS), Vol 1, No 2 (2017): Special Issue: 3rd International MERGE Technologies Conference (IMTC), 21st - 22nd September 2017, Chemnitz
Expressions for Catalan Kronecker Products
Creators: name: Brown, Andrew
name: van Willigenburg, Stephanie
name: Zabrocki, Mike
Publisher: name: arXiv
Year: 2008
Subjects: subject: Combinatorics (math.CO)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 05E05, 20C30

description: We give some elementary manifestly positive formulae for the Kronecker products s_(d,d) * s_(d+k,d-k) and s_(d,d) * s_(2d-k,1^k). These formulae demonstrate some fundamental properties of the Kronecker coefficients, and we use them to deduce a number of enumerative and combinatorial results.
description: 19 pages
Mathematic model for describing the stress-tension behavior of an autoclave with integrated heating element
Creators: name: Graf, Alexander
name: Elovenko, Denis
name: Kräusel, Verena
name: Hirsch, Andreas
Publisher: name: Technologies for Lightweight Structures (TLS)
Year: 2019

description: This paper describes a mathematical model and the method for determining the thermal stress fields in a cylindrical wall element of a pressure vessel with a built-in heating element and a layer of heat insulating material. The method presented is based on the calculation of contact pressures.
description: Technologies for Lightweight Structures (TLS), Vol 2 No 1 (2018): Technologies for Lightweight Structures
Access to Meaningful Learning: Exploring School Processes as Seen Through the Eyes of Children
Creators: name: Lafleur, Michael
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2024
Subjects: India
exclusion
private schools
children's experiences
participatory research

description: In India, the Right of Children to Free and Compulsory Education Act, 2009 (RTE Act) mandates that all private unaided schools must reserve 25% of their seats for free for socially and economically disadvantaged children. The RTE Act is intended to foster the inclusion of all children regardless of their socio-economic background. This study highlights children's accounts of their lived schooling experience at the private schools they accessed in Delhi. The data was collected using participatory methods, more specifically, from 'draw-and-talk' sessions with 16 children from marginalized backgrounds who accessed six different private schools, half of whom obtained a free private school seat (a 'freeship'). Children widely reported that teachers labelled their students and classmates labelled their peers as being 'naughty' and/or academically 'weak' or 'incapable', raising concerns over their socialization processes. These 'designated identities' were internalized by the participants and affected how they interacted with their peers. Student-teacher relationships were widely reported to be influenced by the teachers' aggressive and authoritative nature which often led to corporal punishment. The findings suggest that while the students may become accustomed to corporal punishment, it also provoked feelings of resistance and resentment. While these findings may not be surprising, three unexpected insights emerged: a) children entering private schools on a freeship shared accounts of their schooling experience that were comparatively similar to those who entered on a fee-paying basis, b) the children did not attribute caste or gender explicitly marking their schooling experience, and c) the process of having children participate in the drawing activities was more valuable than the drawing outcomes themselves. Overall, the findings of this study suggest that the ability of the RTE Act and the potential promise of private schools to meet social justice objectives of equity and inclusion have not been fully met, even with the universalizing context of the legislation.
ARM-Net: Adaptive Relation Modeling Network for Structured Data
Creators: name: Cai, Shaofeng
name: Zheng, Kaiping
name: Chen, Gang
name: Jagadish, H. V.
name: Ooi, Beng Chin
name: Zhang, Meihui
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Relational databases are the de facto standard for storing and querying structured data, and extracting insights from structured data requires advanced analytics. Deep neural networks (DNNs) have achieved super-human prediction performance in particular data types, e.g., images. However, existing DNNs may not produce meaningful results when applied to structured data. The reason is that there are correlations and dependencies across combinations of attribute values in a table, and these do not follow simple additive patterns that can be easily mimicked by a DNN. The number of possible such cross features is combinatorial, making them computationally prohibitive to model. Furthermore, the deployment of learning models in real-world applications has also highlighted the need for interpretability, especially for high-stakes applications, which remains another issue of concern to DNNs. In this paper, we present ARM-Net, an adaptive relation modeling network tailored for structured data, and a lightweight framework ARMOR based on ARM-Net for relational data analytics. The key idea is to model feature interactions with cross features selectively and dynamically, by first transforming the input features into exponential space, and then determining the interaction order and interaction weights adaptively for each cross feature. We propose a novel sparse attention mechanism to dynamically generate the interaction weights given the input tuple, so that we can explicitly model cross features of arbitrary orders with noisy features filtered selectively. Then during model inference, ARM-Net can specify the cross features being used for each prediction for higher accuracy and better interpretability. Our extensive experiments on real-world datasets demonstrate that ARM-Net consistently outperforms existing models and provides more interpretable predictions for data-driven decision making.
description: 14 pages, 11 figures, 5 tables, published as a conference paper in ACM SIGMOD 2020
Curvature Perturbation from Supersymmetric Flat Directions
Creators: name: Riotto, Antonio
name: Riva, Francesco
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show that a contribution to the total curvature perturbation may be due to the presence of flat directions in supersymmetric models. It is generated at the first os- cillation of the flat direction condensate when the latter relaxes to the minimum of its potential after the end of inflation. We also point out that, if the contribution to the total curvature perturbation from supersymmetric flat direction is the dominant one, then a significant level of non-Gaussianity in the cosmological perturbation is also naturally expected.
description: Corrected version for PLB
The candidates for Class I methanol masers
Creators: name: Nesterenok, A. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The collisional excitation of methanol molecule in non-dissociative magnetohydrodynamic shock waves is considered. All essential chemical processes that determine methanol abundance in the gas are taken into account in the shock model. The large velocity gradient approximation is used in the calculations of energy level populations of the molecule. We calculate the optical depth for inverted methanol transitions, and present the list of candidates for Class I methanol masers that have collisional pumping mechanism.
description: 6 pages, 1 figure, accepted for publication in Journal of Physics: Conference Series
Fibre-reinforced polymer stirrup for reinforcing concrete structures
Creators: name: Lindner, Marco
name: Vanselow, Konrad
name: Gelbrich, Sandra
name: Kroll, Lothar
Publisher: name: Technologies for Lightweight Structures (TLS)
Year: 2020

description: Fibre-plastic composites offer an interesting alternative to concrete reinforcement. In order to expand the application spectrum of reinforcing elements in fibre composite construction, a new steel-free bracing system with reduced radii of curvature was developed. An improvement in load carrying capacity could be proven in extensive investigations based on international testing methods and verified by practical tests. With the help of newly reinforced precast concrete elements from the area of waterways and traffic routes, a high potential for lightweight construction and resource efficiency can be impressively demonstrated.
description: Technologies for Lightweight Structures (TLS), Vol 3 No 1 (2019): Special Issue: 4th International MERGE Technologies Conference (IMTC), 18th - 19th September 2019, Chemnitz
Haptic input devices with intelligent signal processing ensuring process stability and quality management
Creators: name: Graf, Alexander
name: Decker, Ricardo
name: Schmidt, René
name: Kräusel, Verena
name: Kroll, Lothar
name: Hardt, Wolfram
Publisher: name: Technologies for Lightweight Structures (TLS)
Year: 2020

description: As part of the Cluster of Excellence Merge, a complete process chain was developed for the production of a hybrid laminate with sensory function for continuous production processes. An interior surface of the VW UP! is a good example of this. In this work, the forming processes of the centre console and the parameters influencing quality are discussed. An important parameter for the polarisation of the sensor layer is the thickness of the piezoceramic foil after forming. The maximum signal quality can only be achieved by an exact prediction of the thinning of the foil during the forming process. In addition, the electrical characterisation, especially the capacitance, of the sensor areas is used to determine the foil thickness within the sensor areas in the complex-shaped centre console. Furthermore, a practicable polarisation strategy is deducted in consideration of thickness, electrical characteristics of the piezoceramic foil and process parameters of forming process. For evaluation a novel impact localisation method based on machine learning is shown. Special focus is put on the independence of the impact intensity in order to guarantee a user-independent operation. In this respect, the suitability of various intensity-independent localisation methods will be discussed and subsequently empirically evaluated.
description: Technologies for Lightweight Structures (TLS), Vol 3 No 1 (2019): Special Issue: 4th International MERGE Technologies Conference (IMTC), 18th - 19th September 2019, Chemnitz
Global rough solutions to the cubic nonlinear Boussinesq equation
Creators: name: Farah, Luiz Gustavo
name: Linares, Felipe
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35B30, 35Q55, 35Q72

description: We prove that the initial value problem (IVP) for the cubic defocusing nonlinear Boussinesq equation $u_{tt}-u_{xx}+u_{xxxx}-(|u|^2u)_{xx}=0$ on the real line is globally well-posed in $H^{s}(\R)$ provided $2/3
description: 21 pages, to appear, Journal of the London Mathematical Society. Many suggestions of the referee implemented
Kelvin-Helmholtz instability in strongly coupled dusty plasma with rotational shear flows and tracer transport
Creators: name: Dharodi, Vikram
name: Patel, Bhavesh
name: Das, Amita
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Kelvin-Helmholtz (KH) instability plays a significant role in transport and mixing properties of any medium. In this paper, we numerically explore this instability for a two-dimensional strongly coupled dusty plasma with rotational shear flows. We study this medium using generalized hydrodynamic fluid model which treats it as viscoelastic fluid. We consider the specific cases of rotating vorticity with abrupt radial profiles of rotation. In particular: single-circulation, and multi-circulation vorticity shell profiles have been chosen. We observe the KH vortices at each circular interface between two relative rotating flows along with a pair of ingoing and outgoing wavefronts of transverse shear waves. Our studies show that due to the interplay between KH vortices and shear waves in the strongly coupled medium, the mixing and transport behaviour are much better than inviscid hydrodynamic fluids. In interests of substantiating the mixing and transport behaviour, the generalized hydrodynamic fluid model is extended to include the Lagrangian tracer particles. The numerical dispersion of these tracer particles in a flow provides an estimate of the diffusion in such a medium. We present the preliminary observations of tracers distribution (cluster formation) and their diffusion (mean square displacement) across the medium.
Polarimetric imaging of interacting pairs
Creators: name: Rampazzo, R.
name: Bonoli, C.
name: Giro, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present optical polarization maps of a sample of four interacting pairs at different phases of encounter, from nearly unperturbed galaxies to on-going mergers. Only the pair RR 24 shows a linear polarization pattern which extends in both galaxies for several kiloparsecs. The more perturbed member, RR 24b, is lineraly polarized up to the level of ~3%. No polarization is measured in the strongly perturbed late-type pair members of RR 23 and RR 99. Also, in the central part of the double nuclei shell galaxy ESO 2400100 there is no significant polarization. We use the ionized gas velocity field of RR 24 to interpret its linear polarization structure. In RR 24a the quite regular gas kinematics reflect the unperturbed spiral-like polarization structure. In RR 24b a strong velocity gradient in ionized gas could be associated with the polarization structure. We suggest that the large-scale magnetic field of the RR 24 pair members still plays a role in shaping the polarization pattern.
description: 9 pages, 5 figures, accepted for publication in AN
Low Frequency Two Meter Sky Survey Radial Artifacts Identified as BL Quasars
Creators: name: Paris, Antonio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Through the use of a High Band Antenna system, the Low Frequency Array Two-Meter Sky Survey (LoTSS) is an attempt to complete a high-resolution survey of the northern celestial sky. To date, thousands of radio sources have been classified by LOFAR with most of them consisting of active galactic nuclei (AGN). The strong AGN emissions detected by LoTSS, it is thought, are powered by supermassive black holes (SMBHs) at the center of galaxies. During an analysis of 1500 images of these AGNs, we identified 10 radio sources with radial spokes emitted from an unknown source. According to LOFAR, the radial spokes are artifacts due to calibration errors with no origin, and therefore they cannot be associated with an optical source. Our preliminary hypothesis for the artifacts was that they were produced by ionized jets emitted from quasi-stellar objects (QSOs). Specifically, that strong emissions from Type 1 broadline (BL) quasars were directed in the line of sight of the observer (i.e., LOFAR) and as a result produced the image artifacts. To test our hypotheses, we cross-referenced the ra and dec coordinates of the artifacts with the galactic coordinates indexed in the Sloan Digital Sky Survey (SDSS) and confirmed that the artifacts were associated with BL QSOs. Further analysis of the QSOs, moreover, demonstrated they exhibited prominent broad emission lines such as CIII and MgII, which are characteristic of Type 1 BL quasars. It is our interpretation, therefore, that the radial spokes characterized as artifacts by LOFAR were produced by the emission of Type 1 BL quasars in the line of sight of the radio telescope.
description: 10 pages, 14 figures, 2 tables
Dynamics of Asymptotically Hyperbolic Manifolds
Creators: name: Rowlett, Julie
Publisher: name: arXiv
Year: 2008
Subjects: subject: Spectral Theory (math.SP)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58J50, 53D25, 37D40

description: We prove a dynamical wave trace formula for asymptotically hyperbolic (n+1) dimensional manifolds with negative (but not necessarily constant) sectional curvatures which equates the renormalized wave trace to the lengths of closed geodesics. A corollary of this dynamical trace formula is a dynamical resonance-wave trace formula for compact perturbations of convex co-compact hyperbolic manifolds which we use to prove a growth estimate for the length spectrum counting function. We next define a dynamical zeta function and prove its analyticity in a half plane. In our main result, we produce a prime orbit theorem for the geodesic flow. This is the first such result for manifolds which have neither constant curvature nor finite volume. As a corollary to the prime orbit theorem, using our dynamical resonance-wave trace formula, we show that the existence of pure point spectrum for the Laplacian on negatively curved compact perturbations of convex co-compact hyperbolic manifolds is related to the dynamics of the geodesic flow.
description: Two preliminary lemmas included to elucidate some estimates and details. Remainder terms in theorems, corollaries, and some estimates clarified. Some corrections of notation and references
SSPMJ1102-3431 brown dwarf characterization from accurate proper motion and trigonometric parallax
Creators: name: Teixeira, R.
name: Ducourant, C.
name: Chauvin, G.
name: Krone-Martins, A.
name: Song, I.
name: Zuckerman, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In 2005, Scholz and collaborators (Scholz et al. 2005) discovered, in a proper motion survey, a young brown dwarf SSSPMJ1102-3431(SSSPMJ1102) of spectral type M8.5, probable member of the TW Hydrae Association (TWA) and possible companion of the T Tauri star TW Hya. The physical characterization of SSSPMJ1102 was based on the hypothesis that it forms a binary system with TW Hya. The recent discovery of a probable giant planet inside the TW Hya protoplanetary disk with a very short-period (Setiawan et al. 2008) and a disk around SSSPMJ1102 (Riaz and Gizis 2008) make it especially interesting and important to measure well the physical parameters of SSSPMJ1102. Trigonometric parallax and proper motion measurements of SSSPMJ1102 are necessary to test for TWA membership and, thus, to determine the mass and age of this young brown dwarf and the possibility that it forms a wide binary system with TW Hya. Two years of regular observations at the ESO NTT/SUSI2 telescope, have enabled us to determine the trigonometric parallax and proper motion of SSSPMJ1102. Our parallax and proper motion determination allow us to precisely describe the physical properties of this low mass object and to confirm its TWA membership. Our results are not incompatible with the hypothesis that SSSPMJ1102 is a binary companion of the star TW Hya.
description: accepted for publication in A&A
Shelling with MoS$_2$ Functional CuS@MoS2 Hybrids as Electrocatalysts for the Oxygen Reduction and Hydrogen Evolution Reactions
Creators: name: Bar-Hen, Avraham
name: Ziv, Ronen Bar
name: Ohaion-Raz, Tsion
name: Mizrahi, Amir
name: Hettler, Simon
name: Arenal, Raul
name: Sadan, Maya Bar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The development of noble-metal free electrocatalysts is of high importance for clean energy conversion applications. MoS$_2$ has been considered as a promising low cost catalyst for the hydrogen evolution reaction (HER), however its activity is limited by poor conductivity and low abundance of active sites. Moreover, its suitability as an effective catalyst for other reactions, in particluar the oxygen reduction reaction (ORR), was hardly explored to date. Herein, we show hybrid nanostructures of shelled CuS particles with MoS$_2$ layers, which produces several outcomes: The MoS$_2$ shell is strained and defective, and charge transfer from the core to MoS$_2$ occurs, enabling activation of the basal plane of MoS$_2$. Changing the feed ratio of the precursors led to control over morphology, such that the wrapping of the cores with the shell was continuously varied and characterized. We found an optimal hybrid structure, which provided high electrochemical active surface area and fast charge transfer kinetics, leading to improved activity not only towards HER (overpotential of 225 mV at 10 mA cm$^{-1}$), but also for the sluggish ORR (onset potential 0.87 V vs RHE).
description: 26 pages
title: Child protection, morality and social justice
Creators: name: Kanga, Rustom H.
Publisher: name: University of Kent
Year: 2021

description: This essay is based on the premise that some moral consensus is required in society for effective policies for the protection and care of children to flourish. The first part sets out perspectives on the notion of moral awareness, some aspects of Rawls' theory of justice and the concept of freedom; these are general arguments which lead to a defence of the notion of children's rights, and the role of the state in preserving and enforcing those rights. These arguemnts also seek to underpin the adequate resourcing of children's rights through the political process, and a critique of current inadequacies is offered in a later chapter. The discussion specifically focuses on how parenting standards are assessed, and the assessment of parenting standards as a determinant of definable risk includes a survey of local authorities in England and Wales. A number of situations which might or might not trigger entry on the Child Protection Register are descrived, and each authority was asked to determine its own response. Views were also gathered on what the purpose of Child Protection Registers should be. A discussion of the rights of children in relation to the idea of dependency on the state is carried out with special reference to the Children Act 1989. The essay concludes that the only universal way to offer children proper care and protection is to provide them with a bill of rights relevant to their lives. This should includes opportunities for children to remain with their parents if at all possible. Adult citizenship presupposes that citizens have sufficent self-respect to enjoy the rights and freedoms afforded to them as citizens; children, therefore, need rights to ensure that the development of their own self-respect is not sabotgaged. Finally, a diary of one week's work I completed as a social services team manager is included as an Appendix. Although not part of the conceptual argument, it provides a view of the pressures on Child Protection services as they currently exist and supports the contention that children's rights are inadequately resourced.
A New Prediction Model for Slope Stability Analysis
Creators: name: Rashed, Azadeh <1983>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: ICAR/07 Geotecnica

description: The instability of river bank can result in considerable human and land losses. The Po river is the most important in Italy, characterized by main banks of significant and constantly increasing height. This study presents multilayer perceptron of artificial neural network (ANN) to construct prediction models for the stability analysis of river banks along the Po River, under various river and groundwater boundary conditions. For this aim, a number of networks of threshold logic unit are tested using different combinations of the input parameters. Factor of safety (FS), as an index of slope stability, is formulated in terms of several influencing geometrical and geotechnical parameters. In order to obtain a comprehensive geotechnical database, several cone penetration tests from the study site have been interpreted. The proposed models are developed upon stability analyses using finite element code over different representative sections of river embankments. For the validity verification, the ANN models are employed to predict the FS values of a part of the database beyond the calibration data domain. The results indicate that the proposed ANN models are effective tools for evaluating the slope stability. The ANN models notably outperform the derived multiple linear regression models.
Chemistry in Disks. II. -- Poor molecular content of the AB Aur disk
Creators: name: Schreyer, Katharina
name: Guilloteau, Stéphane
name: Semenov, Dmitry
name: Bacmann, Aurore
name: Chapillon, Edwige
name: Dutrey, Anne
name: Gueth, Frederic
name: Henning, Thomas
name: Hersant, Frank
name: Launhardt, Ralf
name: Pety, Jerome
name: Pietu, Vincent
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the molecular content and chemistry of a circumstellar disk surrounding the Herbig Ae star AB Aur at (sub-)millimeter wavelengths. Our aim is to reconstruct the chemical history and composition of the AB Aur disk and to compare it with disks around low-mass, cooler T Tauri stars. We observe the AB Aur disk with the IRAM Plateau de Bure Interferometer in the C- and D- configurations in rotational lines of CS, HCN, C2H, CH3OH, HCO+, and CO isotopes. Using an iterative minimization technique, observed columns densities and abundances are derived. These values are further compared with results of an advanced chemical model that is based on a steady-state flared disk structure with a vertical temperature gradient, and gas-grain chemical network with surface reactions. We firmly detect HCO+ in the 1--0 transition, tentatively detect HCN, and do not detect CS, C2H, and CH3OH. The observed HCO+ and 13CO column densities as well as the upper limits to the column densities of HCN, CS, C2H, and CH3OH are in good agreement with modeling results and those from previous studies. The AB Aur disk possesses more CO, but is less abundant in other molecular species compared to the DM Tau disk. This is primarily caused by intense UV irradiation from the central Herbig A0 star, which results in a hotter disk where CO freeze out does not occur and thus surface formation of complex CO-bearing molecules might be inhibited.
description: Accepted by A&A
Charge instabilities and electron-phonon interaction in the Hubbard-Holstein model
Creators: name: Di Ciolo, A.
name: Lorenzana, J.
name: Grilli, M.
name: Seibold, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We consider the Hubbard-Holstein model in the adiabatic limit to investigate the effects of electron-electron interactions on the electron-phonon coupling. To this aim we compute at any momentum and filling the static charge susceptibility of the Hubbard model within the Gutzwiller approximation and we find that electron-electron correlations effectively screen the electron coupling to the lattice. This screening is more effective at large momenta and, as a consequence, the charge-density wave phase due to the usual Peierls instability of the Fermi surface momenta is replaced by a phase-separation instability when the correlations are sizable.
description: 15 pages, 12 figures
Electrically Driven Light Emission from Individual CdSe Nanowires
Creators: name: Doh, Yong-Joo
name: Maher, Kristin N.
name: Ouyang, Lian
name: Yu, Chun L.
name: Park, Hongkun
name: Park, Jiwoong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report electroluminescence (EL) measurements carried out on three-terminal devices incorporating individual n-type CdSe nanowires. Simultaneous optical and electrical measurements reveal that EL occurs near the contact between the nanowire and a positively biased electrode or drain. The surface potential profile, obtained by using Kelvin probe microscopy, shows an abrupt potential drop near the position of the EL spot, while the band profile obtained from scanning photocurrent microscopy indicates the existence of an n-type Schottky barrier at the interface. These observations indicate that light emission occurs through a hole leakage or an inelastic scattering induced by the rapid potential drop at the nanowire-electrode interface.
description: 12 pages, 4 figures
Dissecting the Gaia HR diagram within 200 pc
Creators: name: Tio, Piero Dal
name: Mazzi, Alessandro
name: Girardi, Leo
name: Barbieri, Mauro
name: Zaggia, Simone
name: Bressan, Alessandro
name: Chen, Yang
name: Costa, Guglielmo
name: Marigo, Paola
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We analyse the high-quality Hertzsprung-Russell diagram (HRD) derived from Gaia data release 2 for the Solar Neighbourhood. We start building an almost-complete sample within 200 pc and for |b|>25 deg, so as to limit the impact of known errors and artefacts in the Gaia catalog. Particular effort is then put into improving the modelling of population of binaries, which produce two marked features in the HRD: the sequence of near-equal mass binaries along the lower main sequence, and the isolated group of hot subdwarfs. We describe a new tool, BinaPSE, to follow the evolution of interacting binaries in a way that improves the consistency with PARSEC evolutionary tracks for single stars. BinaPSE is implemented into the TRILEGAL code for the generation of "partial models" for both single and binary stellar populations, taking into account the presence of resolved and unresolved binaries. We then fit the Gaia HRD via MCMC methods that search for the star formation history (SFH) and initial binary fraction (by mass) that maximise the likelihood. The main results are (i) the binary fraction derived from the lower main sequence is close to 0.4, while twice larger values are favoured when the upper part of the HRD is fitted; (ii) present models predict the observed numbers of hot subdwarfs to within a factor of 2; (iii) irrespective of the prescription for the binaries, the star formation rate peaks at values 1.5e-4 Msun/yr at ages slightly above 2 Gyr, and then decreases to 0.8e-4 Msun/yr at very old ages.
description: resubmitted to MNRAS after final minor changes requested by referee
Automated supervised classification of variable stars II. Application to the OGLE database
Creators: name: Sarro, L. M.
name: Debosscher, J.
name: Lopez, M.
name: Aerts, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We aim to extend and test the classifiers presented in a previous work against an independent dataset. We complement the assessment of the validity of the classifiers by applying them to the set of OGLE light curves treated as variable objects of unknown class. The results are compared to published classification results based on the so-called extractor methods.Two complementary analyses are carried out in parallel. In both cases, the original time series of OGLE observations of the Galactic bulge and Magellanic Clouds are processed in order to identify and characterize the frequency components. In the first approach, the classifiers are applied to the data and the results analyzed in terms of systematic errors and differences between the definition samples in the training set and in the extractor rules. In the second approach, the original classifiers are extended with colour information and, again, applied to OGLE light curves. We have constructed a classification system that can process huge amounts of time series in negligible time and provide reliable samples of the main variability classes. We have evaluated its strengths and weaknesses and provide potential users of the classifier with a detailed description of its characteristics to aid in the interpretation of classification results. Finally, we apply the classifiers to obtain object samples of classes not previously studied in the OGLE database and analyse the results. We pay specific attention to the B-stars in the samples, as their pulsations are strongly dependent on metallicity.
description: 42 pages, 39 figures. Accepted for publication in Astronomy and Astrophysics
The theme of the descent in the Tale of Genji and the Ramayana
Creators: name: Nakagawa, Masako
Publisher: name: University of British Columbia
Year: 2010

description: This is a comparative study between "The Tale of Genji" and "The Ramayana" which are masterpieces of Japanese and Indian literature, in the theme of the descent of the heroes, Genji and Rama. There are two types of 'descent': one is the external descent which is exile, and the other is the internal descent which is lament. The latter seems to be more important and more profound in the meaning, especially from the Japanese viewpoint. In terms of the theme of the work, the Wakana chapter of "The Tale of Genji" is one of the most important chapters because of its consensus of meaning and interpretation. Although the comparative study between Japanese and Indian literature is very rare, except for Buddistic studies, I would like to make an attempt to search for a new possibility in the study field of literature by starting to examine the heroic powers of Genji and Rama,
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Abel, Andreas
name: Nordvall Forsberg, Fredrik
name: Kaposi, Ambrus
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2019
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 104, 23rd International Conference on Types for Proofs and Programs (TYPES 2017), pages 0:i-0:x
Proposal for a [111] Magnetization Plateau in the Spin Liquid State of Tb2Ti2O7
Creators: name: Molavian, Hamid R.
name: Gingras, Michel J. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Despite a Curie-Weiss temperature $θ_{\rm CW} \sim -14$ K, the Tb2Ti2O7 pyrochlore magnetic material lacks long range magnetic order down to at least $T^*\approx 50$ mK. It has recently been proposed that the low temperature collective paramagnetic or spin liquid regime of this material may be akin to a spin ice state subject to both thermal and quantum fluctuations $-$ a {\it quantum spin ice} (QSI) of sorts. Here we explore the effect of a magnetic field ${\bm B}$ along the $[111]$ direction on the QSI state. To do so, we investigate the magnetic properties of a microscopic model of Tb2Ti2O7 in an independent tetrahedron approximation in a finite ${\bm B}$ along $[111]$. Such a model describes semi-quantitatively the collective paramagnetic regime where nontrivial spin correlations start to develop at the shortest lengthscale, that is over a single tetrahedron, but where no long range order is yet present. Our results show that a magnetization plateau develops at low temperatures as the system develops ${\bm B}=0$ ferromagnetic spin-ice-like "two-in/two-out" correlations at the shortest lengthscale. From these results, we are led to propose that the observation of such a [111] magnetization plateau in Tb2Ti2O7 would provide compelling evidence for a QSI at ${\bm B}=0$ in this material and help guide the development of a theory for the origin of its spin liquid state.
description: 6 pages, 3 figures
Una strategia di elusione del Reale: la sacralizzazione della Cosa nel racconto “La forcina” di Guy de Maupassant
Creators: name: Delvecchio, Darwine
Publisher: name: Università degli Studi di Milano
Year: 2014
Subjects: Ambivalenza; emozioni; Maupassant; psicoanalisi; scienze neurocognitive

description: In questo articolo proponiamo una lettura del racconto “La forcina” di Maupassant, secondo la quale la vicenda particolare del protagonista rappresenterebbe una delle possibili difese che il soggetto umano ha a propria disposizione per mantenersi a distanza dal Reale scabroso della Cosa. La nostra interpretazione prende le mosse dall'analisi condotta sulla sostanza semantica del testo e procederà confrontando gli strumenti forniti dalle scienze neurocognitive e della psicoanalisi freudiana e lacaniana.
(Questo lavoro è stato prodotto nell'ambito del laboratorio sul tema seminariale “Le emozioni” proposto per l'anno 2013 dalla Scuola di Dottorato in Teoria e Analisi del Testo presso l'Università degli Studi di Bergamo)
description: ENTHYMEMA, No 10 (2014)
Dissipative dynamics of a biased qubit coupled to a harmonic oscillator: Analytical results beyond the rotating wave approximation
Creators: name: Hausinger, Johannes
name: Grifoni, Milena
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the dissipative dynamics of a biased two-level system (TLS) coupled to a harmonic oscillator (HO), the latter interacting with an Ohmic environment. Using Van-Vleck perturbation theory and going to second order in the coupling between TLS and HO, we show how the Hamiltonian of the TLS-HO system can be diagonalized analytically. Our model represents an improvement to the usually used Jaynes-Cummings Hamiltonian as an initial rotating wave approximation is avoided. By assuming a weak coupling to the thermal bath, analytical expressions for the time evolution of the populations of the TLS are found: the population is characterized by a multiplicity of damped oscillations together with a complex relaxation dynamics towards thermal equilibrium. The long time evolution is characterized by a single relaxation rate, which is largest at resonance and whose expression can be given in closed analytic form.
description: 39 pages, 17 figures; published version
Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field
Creators: name: Chaves, D. A. D.
name: de Araújo, I. M.
name: Carmo, D.
name: Colauto, F.
name: de Oliveira, A. A. M.
name: de Andrade, A. M. H.
name: Johansen, T. H.
name: Silhanek, A. V.
name: Ortiz, W. A.
name: Motta, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Quantitative magneto-optical imaging of a type-II superconductor thin film cooled under zero, homogeneous, and inhomogeneous applied magnetic fields, indicates that the latter procedure leads to an enhancement of the screening capacity. Such an observation is corroborated by both B-independent and B-dependent critical state model analyses. Furthermore, repulsive (attractive) vortex-(anti)vortex interactions were found to have a decisive role in the shielding ability, with initial states prepared with vortices resulting in a shorter magnetic flux front penetration depth than those prepared with antivortices. The proposed strategy could be implemented to boost the performance of thin superconducting devices.
description: 6 pages and 5 figures
Conversation, Community, and E-Commerce as Social Commerce Model for Food and Beverage business in Phitsanulok Province
Creators: name: Prasittichai Narakorn
name: Tummatinna Seesupan
Publisher: name: Silpakorn University Research, Innovation and Creativity Administration Office
Year: 2019
Subjects: Social Commerce
Conversation
Community
E-Commerce
factor analysis

description: Humanities, Arts and Social Sciences Studies, 19, 1, 101-119
Differentially Private Sliced Wasserstein Distance
Creators: name: Rakotomamonjy, Alain
name: Ralaivola, Liva
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Developing machine learning methods that are privacy preserving is today a central topic of research, with huge practical impacts. Among the numerous ways to address privacy-preserving learning, we here take the perspective of computing the divergences between distributions under the Differential Privacy (DP) framework -- being able to compute divergences between distributions is pivotal for many machine learning problems, such as learning generative models or domain adaptation problems. Instead of resorting to the popular gradient-based sanitization method for DP, we tackle the problem at its roots by focusing on the Sliced Wasserstein Distance and seamlessly making it differentially private. Our main contribution is as follows: we analyze the property of adding a Gaussian perturbation to the intrinsic randomized mechanism of the Sliced Wasserstein Distance, and we establish the sensitivityof the resulting differentially private mechanism. One of our important findings is that this DP mechanism transforms the Sliced Wasserstein distance into another distance, that we call the Smoothed Sliced Wasserstein Distance. This new differentially private distribution distance can be plugged into generative models and domain adaptation algorithms in a transparent way, and we empirically show that it yields highly competitive performance compared with gradient-based DP approaches from the literature, with almost no loss in accuracy for the domain adaptation problems that we consider.
Comparison of the atmosphere above the South Pole, Dome C and Dome A: first attempt
Creators: name: Hagelin, S.
name: Masciadri, E.
name: Lascaux, F.
name: Stoesz, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: The atmospheric properties above three sites (Dome C, Dome A and the South Pole) on the Internal Antarctic Plateau are investigated for astronomical applications using the monthly median of the analyses from ECMWF (the European Centre for Medium-Range Weather Forecasts). Radiosoundings extended on a yearly time scale at the South Pole and Dome C are used to quantify the reliability of the ECMWF analyses in the free atmosphere as well as in the boundary and surface layers, and to characterize the median wind speed in the first 100 m above the two sites. Thermodynamic instability properties in the free atmosphere above the three sites are quantified with monthly median values of the Richardson number. We find that the probability to trigger thermodynamic instabilities above 100 m is smaller on the Internal Antarctic Plateau than on mid-latitude sites. In spite of the generally more stable atmospheric conditions of the Antarctic sites compared to mid-latitude sites, Dome C shows worse thermodynamic instability conditions than those predicted above the South Pole and Dome A above 100 m. A rank of the Antarctic sites done with respect to the strength of the wind speed in the free atmosphere (ECMWF analyses) as well as the wind shear in the surface layer (radiosoundings) is presented.
description: Accepted for publishing in MNRAS. 14 pages, 10 figures. The definitive version is available at http://www.blackwell-synergy.com
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Navarro, Gonzalo
name: Sankoff, David
name: Zhu, Binhai
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2018
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 105, 29th Annual Symposium on Combinatorial Pattern Matching (CPM 2018), pages 0:i-0:xvi
Determinants and Moderators of Online Behaviors
Creators: name: Winley, Graham Kenneth
name: Panthera Dissamarn Dissamarn
Publisher: name: Silpakorn University Research, Innovation and Creativity Administration Office
Year: 2019
Subjects: Altruism
curiosity
individuation
need to belong
personal growth
push/pull online content

description: Humanities, Arts and Social Sciences Studies, 19, 1, 120-160
Fermions and Loops on Graphs. I. Loop Calculus for Determinant
Creators: name: Chernyak, Vladimir Y.
name: Chertkov, Michael
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Computational Complexity (cs.CC)
subject: Information Theory (cs.IT)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: This paper is the first in the series devoted to evaluation of the partition function in statistical models on graphs with loops in terms of the Berezin/fermion integrals. The paper focuses on a representation of the determinant of a square matrix in terms of a finite series, where each term corresponds to a loop on the graph. The representation is based on a fermion version of the Loop Calculus, previously introduced by the authors for graphical models with finite alphabets. Our construction contains two levels. First, we represent the determinant in terms of an integral over anti-commuting Grassman variables, with some reparametrization/gauge freedom hidden in the formulation. Second, we show that a special choice of the gauge, called BP (Bethe-Peierls or Belief Propagation) gauge, yields the desired loop representation. The set of gauge-fixing BP conditions is equivalent to the Gaussian BP equations, discussed in the past as efficient (linear scaling) heuristics for estimating the covariance of a sparse positive matrix.
description: 11 pages, 1 figure; misprints corrected