cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multi-modal fusion with gating using audio, lexical and disfluency features for Alzheimer's Dementia recognition from spontaneous speech
Creators: name: Rohanian, Morteza
name: Hough, Julian
name: Purver, Matthew
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This paper is a submission to the Alzheimer's Dementia Recognition through Spontaneous Speech (ADReSS) challenge, which aims to develop methods that can assist in the automated prediction of severity of Alzheimer's Disease from speech data. We focus on acoustic and natural language features for cognitive impairment detection in spontaneous speech in the context of Alzheimer's Disease Diagnosis and the mini-mental state examination (MMSE) score prediction. We proposed a model that obtains unimodal decisions from different LSTMs, one for each modality of text and audio, and then combines them using a gating mechanism for the final prediction. We focused on sequential modelling of text and audio and investigated whether the disfluencies present in individuals' speech relate to the extent of their cognitive impairment. Our results show that the proposed classification and regression schemes obtain very promising results on both development and test sets. This suggests Alzheimer's Disease can be detected successfully with sequence modeling of the speech data of medical sessions.
Spin states and persistent currents in mesoscopic rings: spin-orbit interactions
Creators: name: Sheng, J. S.
name: Chang, Kai
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate theoretically electron spin states in one dimensional (1D) and two dimensional (2D) hard-wall mesoscopic rings in the presence of both the Rashba spin-orbit interaction (RSOI) and the Dresselhaus spin-orbit interaction (DSOI) in a perpendicular magnetic field. The Hamiltonian of the RSOI alone is mathematically equivalent to that of the DSOI alone using an SU(2) spin rotation transformation. Our theoretical results show that the interplay between the RSOI and DSOI results in an effective periodic potential, which consequently leads to gaps in the energy spectrum. This periodic potential also weakens and smoothens the oscillations of the persistent charge current (CC) and spin current (SC) and results in the localization of electrons. For a 2D ring with a finite width, higher radial modes destroy the periodic oscillations of persistent currents.
description: 12 pages, 14 figures
Integration of geodesic flows on homogeneous spaces: the case of a wild lie group
Creators: name: Magazev, A. A.
name: Shirokov, I. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 53D20; 53D25

description: We obtain necessary and sufficient conditions for the integrability in quadratures of geodesic flows on homogeneous spaces $M$ with invariant and central metrics. The proposed integration algorithm consists in using a special canonical transformation in the space $T^*M$ based on constructing the canonical coordinates on the orbits of the coadjoint representation and on the simplectic sheets of the Poisson algebra of invariant functions. This algorithm is applicable to integrating geodesic flows on homogeneous spaces of a wild Lie group.
description: 18 pages, 1 figure
David Boehringer, Heroenkulte in Griechenland von der geometrischen bis zur klassischen Zeit. Attika, Argolis, Messenien
Creators: name: Deoudi, Maria
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: David Boehringer, Heroenkulte in Griechenland von der geometrischen bis zur klassischen Zeit. Attika, Argolis, Messenien, Klio. Beitrge zur Alten Geschichte, Beihefte Neue Folge 3, Berlin 2001, 375 Seiten.
description: Göttinger Forum für Altertumswissenschaft, Bd. 6 (2003): Göttinger Forum für Altertumswissenschaft
Lattice Quantization with Side Information: Codes, Asymptotics, and Applications in Sensor Networks
Creators: name: Servetto, Sergio D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider the problem of rate/distortion with side information available only at the decoder. For the case of jointly-Gaussian source X and side information Y, and mean-squared error distortion, Wyner proved in 1976 that the rate/distortion function for this problem is identical to the conditional rate/distortion function R_{X|Y}, assuming the side information Y is available at the encoder. In this paper we construct a structured class of asymptotically optimal quantizers for this problem: under the assumption of high correlation between source X and side information Y, we show there exist quantizers within our class whose performance comes arbitrarily close to Wyner's bound. As an application illustrating the relevance of the high-correlation asymptotics, we also explore the use of these quantizers in the context of a problem of data compression for sensor networks, in a setup involving a large number of devices collecting highly correlated measurements within a confined area. An important feature of our formulation is that, although the per-node throughput of the network tends to zero as network size increases, so does the amount of information generated by each transmitter. This is a situation likely to be encountered often in practice, which allows us to cast under new--and more ``optimistic''--light some negative results on the transport capacity of large-scale wireless networks.
description: Final version, to appear in the IEEE Transactions on Information Theory, in February 2007 (first submission: March 2002)
Apollonii Rhodii Lexicon, curante Giuseppe Pompella
Creators: name: Dräger, Paul
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Apollonii Rhodii Lexicon, curante Giuseppe Pompella. 2. Auflage. Hildesheim, Zürich, New York 2002 (Alpha-Omega: Reihe A, Lexika, Indizes, Konkordanzen zur klassischen Philologie; Bd. 194), IV, 674 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 6 (2003): Göttinger Forum für Altertumswissenschaft
Two loop divergences studied with one loop Constrained Differential Renormalization
Creators: name: Seijas, Cesar
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the context of Differential Renormalization, using Constrained Differential Renormalization rules at one loop, we show how to obtain concrete results in two loop calculations without making use of Ward identities. In order to do that, we obtain a list of integrals with overlapping divergences compatible with CDR that can be applied to various two loop background field calculations. As an example, we obtain the two loop coefficient of the beta function of QED, SuperQED and Yang-Mills theory.
description: 33 pages, 5 figures
A Miniaturized Low Frequency (LF) Magnetoelectric Receiving Antenna with an Integrated DC Magnetic Bias
Creators: name: Niu, Yunping
name: Ren, Hao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Due to the applications in meteorological broadcasts, radio navigation and underwater communications, low-frequency(LF) receiving antennas have been actively studied. However, because the frequency range of LF antenna is 30kHz to 300kHz, its electromagnetic wavelength is 1km to 10km, which makes LF electromagnetic antennas difficult to be implemented in miniaturized or portable devices. This article presents a miniaturized LF magnetoelectric(ME) receiving antenna with an integrated DC magnetic bias. The antenna is based on the magnetoelectric effect and operates by resonance at its mechanical resonant frequency. Thus, compared with traditional LF wire antennas, the dimension of ME antenna is reduced significantly. Compared with prior art of ME antennas which do not have DC magnetic bias, higher performance can be achieved by integrating the miniaturized DC magnetic bias. Compared with prior art of an ME antenna with bulky external DC magnetic bias, the ME antenna with an integrated DC magnetic bias significantly reduce its dimension. Magnetostrictive TbDyFe2(Terfenol-D) and piezoelectric lead zirconate titanate(PZT) thin films are bonded together to form the 38x12x5.8mm3 ME receiving antenna. Four 10x10x10mm3 Rb magnets are implemented to provide an optimal DC bias for the antenna. A maximum operation distance of 2.5m is demonstrated with the DC magnetic field bias, 2.27 times of the maximum operation distance of the antenna without DC magnet field bias. The efficiency, gain and quality factor the ME receiving antenna is also characterized. The miniaturized LF ME antenna could have potential applications in portable electronics, internet of things and underwater communications.
description: 10 pages, 7 figures for the main manuscript. The manuscript is revised with added experimental results
QED in the worldline representation
Creators: name: Schubert, Christian
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Simultaneously with inventing the modern relativistic formalism of quantum electrodynamics, Feynman presented also a first-quantized representation of QED in terms of worldline path integrals. Although this alternative formulation has been studied over the years by many authors, only during the last fifteen years it has acquired some popularity as a computational tool. I will shortly review here three very different techniques which have been developed during the last few years for the evaluation of worldline path integrals, namely (i) the ``string-inspired formalism'', based on the use of worldline Green functions, (ii) the numerical ``worldline Monte Carlo formalism'', and (iii) the semiclassical ``worldline instanton'' approach.
description: 18 pages, 7 figures, talk given at VI Latinamerican Symposium on High Energy Physics, Nov. 1-8, 2006, Puerto Vallarta, Mexico; references added and corrected (no other changes)
Quantum information measures of the Dirichlet and Neumann hyperspherical dots
Creators: name: Olendski, O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: $\mathtt{d}$-dimensional hyperspherical quantum dot with either Dirichlet or Neumann boundary conditions (BCs) allows analytic solution of the Schrödinger equation in position space and the Fourier transform of the corresponding wave function leads to the analytic form of its momentum counterpart too. This paves the way to an efficient computation in either space of Shannon, Rényi and Tsallis entropies, Onicescu energies and Fisher informations; for example, for the latter measure, some particular orbitals exhibit simple expressions in either space at any BC type. A comparative study of the influence of the edge requirement on the quantum information measures proves that the lower threshold of the semi-infinite range of the dimensionless Rényi/Tsallis coefficient where one-parameter momentum entropies exist is equal to $\mathtt{d}/(\mathtt{d}+3)$ for the Dirichlet hyperball and $\mathtt{d}/(\mathtt{d}+1)$ for the Neumann one what means that at the unrestricted growth of the dimensionality both measures have their Shannon fellow as the lower verge. Simultaneously, this imposes the restriction on the upper value of the interval $[1/2,α_R)$ inside which the Rényi uncertainty relation for the sum of the position $R_ρ(α)$ and wave vector $R_γ\left(\fracα{2α-1}\right)$ components is defined: $α_R$ is equal to $\mathtt{d}/(\mathtt{d}-3)$ for the Dirichlet geometry and to $\mathtt{d}/(\mathtt{d}-1)$ for the Neumann BC. Some other properties are discussed from mathematical and physical points of view. Parallels are drawn to the corresponding properties of the hydrogen atom and similarities and differences are explained based on the analysis of the associated wave functions.
description: 5 figures, 2 tables
The legality of the new industrial relations
Creators: name: Jamieson, Eugene Christopher
Publisher: name: University of British Columbia
Year: 2008

description: This paper examines the extent to which industrial relations innovations stressing individual employee participation in workplace decision-making conflicts with labour law in the United States of America and Canada. It begins with an overview of the economic imperatives facing North American business enterprises which compel them to adopt industrial relations innovations stressing employee-involvement in decision-making. The overview also highlights the potential conflict between these innovations emphasizing individual employees and labour law which emphasizes collective relations with employees. Next, the paper details the economic landscape that makes innovation necessary in industrial relations. The paper then describes the operation of specific innovations: Quality of Working Life Programs, quality circles, joint labour-management committees and semi-autonomous work groups. The paper emphasizes the need to examine the relationship between these innovations and labour law in historical context. Thus, the paper next details the history of fundamental elements in North American collective bargaining which cause particular tension for these industrial relations innovations: the exclusion of managerial personnel from collective bargaining, a trade union's exclusive bargaining agent status, and the prohibition of employer domination of or interference with trade unions. Next, the paper examines in depth the American and Canadian legislation and jurisprudence surrounding these doctrines. This results in predictions as to the extent to which these doctrines render illegal certain aspects of the industrial innovations. The paper concludes that there is a strong potential for conflict between labour law and these innovations.
Asymptotic solution to convolution integral equations on large and small intervals
Creators: name: Ponomarev, Dmitry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 45B05, 45C05, 45M05, 45P05, 47G10, 47B35

description: We consider convolution integral equations on a finite interval with a real-valued kernel of even parity, a problem equivalent to finding a Wiener-Hopf factorisation of a notoriously difficult class of $2\times 2$ matrices. The kernel function is assumed to be sufficiently smooth and decaying for large values of the argument. Without loss of generality, we focus on a homogeneous equation and we propose methods to construct explicit asymptotic solutions when the interval size is large and small. The large interval method is based on a reduction of the original equation to an integro-differential equation on a half-line that can be asymptotically solved in a closed form. This provides an alternative to other asymptotic techniques that rely on fast (typically exponential) decay of the kernel function at infinity which is not assumed here. We also consider the problem on a small interval and show that finding its asymptotic solution can be reduced to solving an ODE. In particular, approximate solutions could be constructed in terms of readily available special functions (prolate spheroidal harmonics). Numerical illustrations of the obtained results are provided and further extensions of both methods are discussed.
Segmentasi Citra Menggunakan Metode Watershed Transform Berdasarkan Image Enhancement Dalam Mendeteksi Embrio Telur
Creators: name: Saifullah, Shoffan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: I.4.6

description: Image processing can be applied in the detection of egg embryos. The egg embryos detection is processed using a segmentation process. The segmentation divides the image according to the area that is divided. This process requires improvement of the image that is processed to obtain optimal results. This study will analyze the detection of egg embryos based on image processing with image enhancement and the concept of segmentation using the watershed method. Image enhancement in preprocessing in image improvement uses a combination of Contrast Limited Adaptive Histogram Equalization (CLAHE) and Histogram Equalization (HE) methods. The grayscale egg image is corrected using the CLAHE method, and the results are reprocessed using HE. The image improvement results show that the CLAHE-HE combination method gives a clear picture of the object area of the egg image that has an embryo. The segmentation process using image conversion to black and white image and watershed segmentation can clearly show the object of a chicken egg that has an embryo. The results of segmentation can divide the area of the egg having embryos in a real and accurate way with a percentage \approx 98\%.
description: 8 pages, in Indonesian language, 6 figures
Syntactic elicitation and picture task (wh-phrases, object shift)
Creators: name: GZG
name: IIQ
name: Baclawski, Kenneth
name: Sikhara (Đàng Thanh Quốc Thuận)
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: cjm

description: Picture task: Using cards from the board game Dixit to elicit question-answer pairs
Die sogenannte Nova Urbs von Italica - eine ‘griechisch-hellenistische’ Stadtanlage tief im Westen des römischen Reiches?
Creators: name: Gans, Ulrich-Walter
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 6 (2003): Göttinger Forum für Altertumswissenschaft
The Global Star Formation Law: from Dense Cores to Extreme Starbursts
Creators: name: Gao, Yu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Active star formation (SF) is tightly related to the dense molecular gas in the giant molecular clouds' dense cores. Our HCN (measure of the dense molecular gas) survey in 65 galaxies (including 10 ultraluminous galaxies) reveals a tight linear correlation between HCN and IR (SF rate) luminosities, whereas the correlation between IR and CO (measure of the total molecular gas) luminosities is nonlinear. This suggests that the global SF rate depends more intimately upon the amount of dense molecular gas than the total molecular gas content. This linear relationship extends to both the dense cores in the Galaxy and the hyperluminous extreme starbursts at high-redshift. Therefore, the global SF law in dense gas appears to be linear all the way from dense cores to extreme starbursts, spanning over nine orders of magnitude in IR luminosity.
description: 5 pages including (questions/answers) discussion. Talk contribution at IAU Symp. 237, B.G. Elmegreen & J. Palous, eds
N-fold Parasupersymmetry
Creators: name: Tanaka, Toshiaki
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We find a new type of non-linear supersymmetries, called N-fold parasupersymmetry, which is a generalization of both N-fold supersymmetry and parasupersymmetry. We provide a general formulation of this new symmetry and then construct a second-order N-fold parasupersymmetric quantum system where all the components of N-fold parasupercharges are given by type A N-fold supercharges. We show that this system exactly reduces to the Rubakov-Spiridonov model when N=1 and admits a generalized type C 2N-fold superalgebra. We conjecture the existence of other `N-fold generalizations' such as N-fold fractional supersymmetry, N-fold orthosupersymmetry, and so on.
description: 10 pages, no figures; Intro. expanded
Der Sturz des Vatinius durch den Redner Maternus (Tac. dial. 11,2)
Creators: name: Zwierlein, Otto
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 6 (2003): Göttinger Forum für Altertumswissenschaft
IMF-induced intrinsic uncertainties on measuring galaxy distances based on the number of giant stars: the case of the ultra-diffuse galaxy NGC 1052-DF2
Creators: name: Zonoozi, Akram Hasani
name: Haghi, Hosein
name: Kroupa, Pavel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The surface brightness fluctuation (SBF) technique is one of the distance measurement methods that has been applied on the low surface brightness galaxy NGC 1052-DF2 yielding a distance of about 20 Mpc implying it to be a dark matter deficient galaxy. We assume the number of giant stars above a given luminosity threshold to represent the SBF magnitude. The SBF magnitude depends on the distance, but this is degenerate with the star formation history (SFH). Using a stellar population synthesis model we calculate the number of giant stars for stellar populations with different galaxy-wide stellar initial mass functions (gwIMFs), ages, metallicities and SFHs. If the gwIMF is the invariant canonical IMF, the 1$σ$ (3$σ$) uncertainty in colour allows a distance as low as 12 Mpc (8 Mpc). If instead the true underlying gwIMF is the integrated galaxy-wide IMF (IGIMF) then overestimating distances for low-mass galaxies would be a natural result, allowing NGC 1052-DF2 to have a distance of 11 Mpc within the 1$σ$ colour uncertainty. Finally, we show that our main conclusion on the existence of a bias in the SBF distance estimation is not much affected by changing the luminosity lower limit for counting giant stars.
description: Accepted for publication in MNRAS. 9 pages, 7 figures, updated according to the received comments
Transport of magnetic vortices by surface acoustic waves
Creators: name: Jachmann, F.
name: Hucho, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In a thin film of superconducting YBCO the impact of surface acoustic waves (SAWs) traveling on the piezoelectric substrate is investigated. A pronounced interaction between the ultrasonic waves and the vortex system in the type II superconductor is observed. The occurrence of a SAW-induced dc voltage perpendicular to the sound path is interpreted as {\em dynamic pinning} of vortices by the piezoacoustic SAW, which acts as a conveyor for the fluxquanta. Its antisymmetry with respect to the magnetic field directly evidences the induced, directed flux motion.This dynamic manipulation of vortices can be seen as an important step towards flux-based electronic devices.
description: submitted
Antibound States and Halo Formation in the Gamow Shell Model
Creators: name: Michel, N.
name: Nazarewicz, W.
name: Ploszajczak, M.
name: Rotureau, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The open quantum system formulation of the nuclear shell model, the so-called Gamow Shell Model (GSM), is a multi-configurational SM that employs a single-particle basis given by the Berggren ensemble consisting of Gamow states and the non-resonant continuum of scattering states. The GSM is of particular importance for weakly bound/unbound nuclear states where both many-body correlations and the coupling to decay channels are essential. In this context, we investigate the role of l=0 antibound (virtual) neutron single-particle states in the shell model description of loosely bound wave functions, such as the ground state wave function of a halo nucleus 11Li.
Reference Energies for Intramolecular Charge-Transfer Excitations
Creators: name: Loos, Pierre-François
name: Comin, Massimiliano
name: Blase, Xavier
name: Jacquemin, Denis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In the aim of completing our previous efforts devoted to local and Rydberg transitions in organic compounds, we provide a series of highly-accurate vertical transition energies for intramolecular charge-transfer transitions occurring in ($π$-conjugated) molecular compounds. To this end we apply a composite protocol consisting of linear-response CCSDT excitation energies determined with Dunning's double-$ζ$ basis set corrected by CC3/CCSDT-3 energies obtained with the corresponding triple-$ζ$ basis. Further basis set corrections (up to \emph{aug}-cc-pVQZ) are obtained at the CCSD and CC2 level. We report 30 transitions obtained in 17 compounds. These reference values are then used to benchmark a series of wave function (CIS(D), SOPPA, RPA(D), EOM-MP2, CC2, CCSD, CCSD(T)(a)*, CCSDR(3), CCSDT-3, CC3, ADC(2), ADC(3), and ADC(2.5)), the Green's function-based Bethe-Salpeter equation (BSE) formalism performed on top of the partially self-consistent ev$GW$ scheme considering two different starting points (BSE/ev$GW$@HF and BSE/ev$GW$@PBE0), and TD-DFT combined with several exchange-correlation functionals (B3LYP, PBE0, M06-2X, CAM-B3LYP, LC-$ω$HPBE, $ω$B97X, $ω$B97X-D, and M11).
description: 25 pages, 3 figures, 3 tables (SI available)
Free electron in a laser field: The nonrelativistic solution
Creators: name: Yuce, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Schrodinger equation for a charged particle interacting with the plane wave electromagnetic field is solved exactly. The exact analytic solution and the perturbative solution up to second order are compared.
Resolution in Focused Electron- and Ion-Beam Induced Chemical Vapor Deposition
Creators: name: Utke, Ivo
name: Friedli, Vinzenz
name: Purrucker, Martin
name: Michler, Johann
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The key physical processes governing resolution of focused electron-beam and ion-beam-assisted chemical vapor deposition are analyzed via an adsorption rate model. We quantify for the first time how the balance of molecule depletion and replenishment determines the resolution inside the locally irradiated area. Scaling laws are derived relating the resolution of the deposits to molecule dissociation, surface diffusion, adsorption, and desorption. Supporting results from deposition experiments with a copper metalorganic precursor gas on a silicon substrate are presented and discussed.
description: 4 pages, 4 figures, 1 table
Tops from Light Quarks: Full Mass Dependence at Two-Loops in QCD
Creators: name: Czakon, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I present the two-loop QCD corrections to the production of a massive quark-anti-quark pair in the massless quark-anti-quark annihilation channel. The result is obtained as a combination of a deep expansion in the mass around the high energy limit and of a numerical integration of a system of differential equations. The primary application of the outcome and developed methods is top quark pair production at the Large Hadron Collider.
description: 16 pages, 5 figures, 3 tables, Mathematica files containing the small mass series expansion and numerical values at grid points as given on the plots in the paper are attached. Final version to appear in Phys. Lett. B
A review of the electronic and magnetic properties of tetrahedrally bonded half-metallic ferromagnets
Creators: name: Mavropoulos, Ph.
name: Galanakis, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The emergence of the field of spintronics brought half-metallic ferromagnets to the center of scientific research. A lot of interest was focused on newly created transition-metal pnictides (such as CrAs) and chalcogenides (such as CrTe) in the metastable zinc-blende lattice structure. These compounds were found to present the advantage of high Curie temperature values in addition to their structural similarity to semiconductors. Significant theoretical activity has been devoted to the study of the electronic and magnetic properties of these compounds in an effort to achieve a better control of their experimental behaviour in realistic applications. This review is devoted to an overview of the studies of these compounds, with emphasis on theoretical results, covering their bulk properties (electronic structure, magnetism, stability of the zinc-blende phase, stability of ferromagnetism) as well as low-dimensional structures (surfaces, interfaces, nanodots and transition-metal delta-doped semiconductors) and phenomena that can possibly destroy the half-metallic property, like structural distortions or defects.
description: Submitted for a speical issue of J. Phys.: Condens. Matter on "half-metallic ferromagnets"
Der staunende Achill: Eine poetologische Lektüre der 'Cygnus'-Episode (Ov. met. 12,64-167)
Creators: name: Möller, Melanie
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 6 (2003): Göttinger Forum für Altertumswissenschaft
Implementation of Correlation and Regression Models for Health Insurance Fraud in Covid-19 Environment using Actuarial and Data Science Techniques
Creators: name: Gupta, Rohan Yashraj
name: Mudigonda, Satya Sai
name: Baruah, Pallav Kumar
name: Kandala, Phani Krishna
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Fraud acts as a major deterrent to a companys growth if uncontrolled. It challenges the fundamental value of Trust in the Insurance business. COVID-19 brought additional challenges of increased potential fraud to health insurance business. This work describes implementation of existing and enhanced fraud detection methods in the pre-COVID-19 and COVID-19 environments. For this purpose, we have developed an innovative enhanced fraud detection framework using actuarial and data science techniques. Triggers specific to COVID-19 are identified in addition to the existing triggers. We have also explored the relationship between insurance fraud and COVID-19. To determine this we calculated Pearson correlation coefficient and fitted logarithmic regression model between fraud in health insurance and COVID-19 cases. This work uses two datasets: health insurance dataset and Kaggle dataset on COVID-19 cases for the same select geographical location in India. Our experimental results shows Pearson correlation coefficient of 0.86, which implies that the month on month rate of fraudulent cases is highly correlated with month on month rate of COVID-19 cases. The logarithmic regression performed on the data gave the r-squared value of 0.91 which indicates that the model is a good fit. This work aims to provide much needed tools and techniques for health insurance business to counter the fraud.
All I’m asking for is a little respect: equality rights and same-sex spousal benefits
Creators: name: Banks, Nancy K.
Publisher: name: University of British Columbia
Year: 2008

description: This thesis explores same-sex spousal benefits claims against the background of Canada’s equality rights jurisprudence. This, in turn, is examined in light of the right to respect for one's private life, as developed in European human rights jurisprudence, and contrasted with the right to privacy doctrine developed in the United States of America. The judicial development of limitations of constitutionally guaranteed rights and freedoms is also examined with a view to developing a successful same-sex spousal benefit claim.
Some geometric aspects of Puiseux surfaces
Creators: name: Tornero, Jose M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 14B05, 32S22

description: The following problem is treated: Characterizing the tangent cone and the equimultiple locus of a Puiseux surface (that is, an algebroid embedded surface admitting an equation whose roots are Puiseux power series), using a set of exponents appearing in a root of an equation. The aim is knowing to which extent the well--known results for the quasi--ordinary case can be extended to this much wider family.
description: Preliminary version (October 2002). Final version already published (2003)
A SCUBA imaging survey of ultracompact HII regions: The environments of massive star formation
Creators: name: Thompson, M. A.
name: Hatchell, J.
name: Walsh, A. J.
name: Macdonald, G. H.
name: Millar, T. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a SCUBA submillimetre (450 & 850 micron) survey of the environment of 105 IRAS point sources, selected from the Wood & Churchwell (1989a) and Kurtz, Churchwell & Wood (1994) radio ultracompact (UC) HII region surveys. We detected a total of 155 sub-mm clumps associated with the IRAS point sources and identified three distinct types of object: ultracompact cm-wave sources that are not associated with any sub-mm emission (sub-mm quiet objects), sub-mm clumps that are associated with ultracompact cm-wave sources (radio-loud clumps); and sub-mm clumps that are not associated with any known ultracompact cm-wave sources (radio-quiet clumps). 90% of the sample of IRAS point sources were found to be associated with strong sub-mm emission. We consider the sub-mm colours, morphologies and distance-scaled fluxes of the sample of sub-mm clumps and show that the sub-mm quiet objects are unlikely to represent embedded UC HII regions unless they are located at large heliocentric distances. Many of the 2.5 arcmin SCUBA fields contain more than one sub-mm clump, with an average number of companions (the companion clump fraction) of 0.90. The clumps are more strongly clustered than other candidate HMPOs and the mean clump surface density exhibits a broken power-law distribution with a break at 3 pc. We demonstrate that the sub-mm and cm-wave fluxes of the majority of radio-loud clumps are in excellent agreement with the standard model of ultracompact HII regions. We speculate on the nature of the radio-quiet sub-mm clumps and, whilst we do not yet have sufficient data to conclude that they are in a pre-UC HII region phase, we argue that their characteristics are suggestive of such a stage.
description: Accepted by A&A. Note that due to size constraints the Online Supplement cannot be reproduced here and that several of the figures are low-resolution versions. A complete preprint (in PDF format) with full resolution images is available at http://star-www.herts.ac.uk/~mat/uchii_environs.pdf
Searching for simultaneous arithmetic progressions on elliptic curves
Creators: name: Garcia-Selfa, Irene
name: Tornero, Jose M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G05, 11B25

description: We look for elliptic curves featuring rational points whose coordinates form two arithmetic progressions, one for each coordinate. A constructive method for creating such curves is shown, for lengths up to 5.
description: Preliminary version (November 2004). Final version already published (2005)
An 8 channel parallel transmit system with current sensor feedback for MRI-guided interventional applications
Creators: name: Godinez, Felipe
name: Tomi-Tricot, Raphael
name: Barthel, Matthias
name: Lykowsky, Gunthard
name: Scott, Greig
name: Razavi, Reza
name: Hajnal, Joseph
name: Malik, Shaihan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Background: Parallel transmit (pTx) has introduced many benefits to MRI with regard to decreased specific absorption rates and improved transmit field homogeneity, of particular importance in applications at higher magnetic field strengths. PTx has also been proposed as a solution to mitigating dangerous RF induced heating of elongated conductive devices such as those used in cardiac interventions. In this work we present a system that can augment a conventional scanner with pTx, in particular for use in interventional MRI for guidewire safety. Methods: The pTx system was designed to work in-line with a 1.5T MRI while the RF synthesis and imaging control was maintained on the host MR scanner. The add on pTx system relies on the RF transmit signal, unblanking pulse, and a protocol driven trigger from the scanner. The RF transmit was split into multiple fully modulated transmit signals to drive an array of custom transceiver coils. The performance of the 8-channel implementation was tested with regards to active and real-time control of RF induced currents on a standard guidewire, heating mitigation tests, and anatomical imaging in a sheep torso. Results: The pTx system was intended to update RF shims in real-time and it was demonstrated that the safe RF shim could be determined while the guidewire is moved. The anatomical imaging demonstrated that heart anatomy and neighbouring structures can be fully imaged with the pTx system inline. Conclusion: We have presented the design and performance of a real-time feedback control pTx system capable of adding such capabilities to a conventional MRI with the focus guidewire imaging in cardiac interventional MRI applications.
Kambyses' Feldzug gegen Ägypten: Der sogenannte Kambyses-Roman und sein Verhältnis zu griechischer Literatur
Creators: name: Döpp, Siegmar
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 6 (2003): Göttinger Forum für Altertumswissenschaft
Confined coherence in quasi-one-dimensional metals
Creators: name: Ledowski, Sascha
name: Kopietz, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a functional renormalization group calculation of the effect of strong interactions on the shape of the Fermi surface of weakly coupled metallic chains. In the regime where the bare interchain hopping is small, we show that scattering processes involving large momentum transfers perpendicular to the chains can completely destroy the warping of the true Fermi surface, leading to a confined state where the renormalized interchain hopping vanishes and a coherent motion perpendicular to the chains is impossible.
description: 4 RevTex pages, 5 figures,final version as published by PRB
The role of a board of directors in responding to an unsolicited takeover bid
Creators: name: Rankin, Mark W. J.
Publisher: name: University of British Columbia
Year: 2008

description: The proliferation in the use of the "unsolicited takeover bid" as a means of acquiring corporate control has had profound implications, especially on large publicly traded companies. Although much has been written about the efficacy of takeover bids advancing shareholders' interests and economic prosperity in North America, surprisingly, opinions on this topic remain divisive. What is even more interesting is the diversity of opinions held with respect to directors' obligations when responding to an unsolicited takeover bid. What is the "appropriate role" of a board of directors when their company becomes the subject of an unsolicited takeover bid? In the execution of their duties and obligations to manage the business and affairs of a company, we are told that directors are in part, required to acthonestly and in good faith in promoting the best interests ofthe company. Much of the discussion in this paper will be confined to how this phrase, "the best interests of the company" might be interpreted in the context of an unsolicited takeover bid. What are the constituent elements that make up "the company"? Which interests should be construed as being in the company's best interests? To whom are the directors' duties and obligations owed in endeavouring to promote the best interests of the company? In the conclusion of this thesis, a theory has been advanced based on the notion of reasonable shareholders' expectations and legitimate shareholders' interests, as a possible approach to understanding the correct meaning of the phrase, "the best interests of the company" and from that, the role directors are to play when confronted with an unsolicited takeover bid for their company.
Peter C. Bol (Hrsg.), Die Geschichte der antiken Bildhauerkunst. I. Frühgriechische Plastik
Creators: name: Carl, Tanja
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Peter C. Bol (Hrsg.), Die Geschichte der antiken Bildhauerkunst. I. Frühgriechische Plastik, bearbeitet von P.C. BOL u.a., Mainz 2002 (Ph. v. Zabern), IX + 343 S. Text; 376 S. Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 7 (2004): Göttinger Forum für Altertumswissenschaft
The Interstellar Medium toward the Galactic Center Source 2MASS J17470898-2829561
Creators: name: Geballe, T. R.
name: Pendleton, Yvonne
name: Chiar, Jean
name: Tielens, Alexander G . G. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We describe and discuss remarkable infrared spectra, covering key portions of the $2-5$ $μ$m wavelength interval, of the probable OH/IR supergiant 2MASS J17470898$-$2829561 (2M1747), located in direction of the Sgr B molecular cloud complex within the Central Molecular Zone (CMZ) of the Galaxy. This star was originally singled out for examination based on its suitability for spectroscopy of lines of H$_3^+$ in the CMZ. Analysis of the spectra shows that 2M1747 is deeply embedded within Sgr B1, with A$_V$ $\gtrsim$ 100 mag, making it the only star within Sgr B for which infrared spectra have been obtained at present, and thereby a unique infrared probe of the dense interstellar medium within the CMZ. Despite the high extinction, spectra of 2M1747 reveal a veiled photosphere in the $K$ band and circumstellar gas in the $M$ band, giving clues as to its nature. Its $ 3.5-4.0$ $μ$m spectrum contains the strongest absorption lines of H$_3^+$ observed toward any object to date. The $4.5-4.8$ $μ$m spectrum has impressively deep and wide absorption lines of interstellar CO, most of which arise in dense gas within Sgr B1. The $3-5$ $μ$m spectrum also contains several solid state absorption features, which are characteristic of both dense and diffuse clouds, and which raise questions about the identifications of some of these features. We discuss the nature of the star, the extinction to it, the extinction law for dust in the CMZ, and the identifications of the various solid-state features and where they are produced along this complex line of sight.
description: 17 pages, 10 figures; accepted by ApJ 2021 March 10
Data Mining in Electronic Commerce
Creators: name: Banks, David L.
name: Said, Yasmin H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Modern business is rushing toward e-commerce. If the transition is done properly, it enables better management, new services, lower transaction costs and better customer relations. Success depends on skilled information technologists, among whom are statisticians. This paper focuses on some of the contributions that statisticians are making to help change the business world, especially through the development and application of data mining methods. This is a very large area, and the topics we cover are chosen to avoid overlap with other papers in this special issue, as well as to respect the limitations of our expertise. Inevitably, electronic commerce has raised and is raising fresh research problems in a very wide range of statistical areas, and we try to emphasize those challenges.
description: Published at http://dx.doi.org/10.1214/088342306000000204 in the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Geometric and Topological Entropies of Sphere Packing
Creators: name: Logan, Jack A.
name: Tkachenko, Alexei V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a statistical mechanical description of randomly packed spherical particles, where the average coordination number is treated as a macroscopic thermodynamic variable. The overall packing entropy is shown to have two contributions: geometric, reflecting statistical weights of individual configurations, and topological, which corresponds to the number of topologically distinct states. Both of them are computed in the thermodynamic limit for isostatic packings in 2D and 3D, and the result is further expanded to the case of "floppy" particle clusters. The theory is directly applicable to sticky colloids, and in addition, generalizes concepts of granular and glassy configurational entropies for the case of non-jammed systems.
description: 8 pages, 7 figures
Woodpile and diamond structures by optical interference holography
Creators: name: Tam, Wing Yim
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report the use of an optical interference holographic setup with a five-beam configuration, consisting of four side beams and one central beam from the same half space, to fabricate woodpile and diamond structures for the use as photonic bandgap materials in which electromagnetic waves are forbidden in the bandgap. By exploiting the advantage of the binarization of the interference pattern, using intensity cut-off, either linear or circular central beam can be used. More importantly, the beam configurations can be easily implemented experimentally as compared to other configurations in which the interfering beams are counter-propagating from both half spaces.
description: 11 pages, 3 figures, and one table