cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Rough Computing based Performance Evaluation Approach for Educational Institutions
Creators: name: Acharjya, Debi Prasanna
name: Bhattacharjee, Debarati
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Performance evaluation of various organizations especially educational institutions is a very important area of research and needs to be cultivated more. In this paper, we propose a performance evaluation for educational institutions using rough set on fuzzy approximation spaces with ordering rules and information entropy. In order to measure the performance of educational institutions, we construct an evaluation index system. Rough set on fuzzy approximation spaces with ordering is applied to explore the evaluation index data of each level. Furthermore, the concept of information entropy is used to determine the weighting coefficients of evaluation indexes. Also, we find the most important indexes that influence the weighting coefficients. The proposed approach is validated and shows the practical viability. Moreover, the proposed approach can be applicable to any organizations.
description: 18 pages
Phase Field Crystal Model for Magneto-Elasticity in Isotropic Ferromagnetic Solids
Creators: name: Faghihi, Niloufar
name: Provatas, Nikolas
name: Elder, K. R.
name: Grant, Martin
name: Karttunen, Mikko
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: A new isotropic magneto-elastic phase field crystal (PFC) model to study the relation between morphological structure and magnetic properties of pure ferromagnetic solids is introduced. Analytic calculations were used to determine the phase diagram and obtain the relationship between elastic strains and magnetization. Time dependent numerical simulations were used to demonstrate the effect of grain boundaries on the formation of magnetic domains. It was shown that the grain boundaries act as nucleating sites for domains of reverse magnetization. Finally, we derive a relation for coercivity versus grain mis-orientation in the isotropic limit.
Conserved charges of the extended Bondi-Metzner-Sachs algebra
Creators: name: Flanagan, Éanna É.
name: Nichols, David A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Isolated objects in asymptotically flat spacetimes in general relativity are characterized by their conserved charges associated with the Bondi-Metzner-Sachs (BMS) group. These charges include total energy, linear momentum, intrinsic angular momentum and center-of-mass location, and, in addition, an infinite number of supermomentum charges associated with supertranslations. Recently, it has been suggested that the BMS symmetry algebra should be enlarged to include an infinite number of additional symmetries known as superrotations. We show that the corresponding charges are finite and well defined, and can be divided into electric parity "super center-of-mass" charges and magnetic parity "superspin" charges. The supermomentum charges are associated with ordinary gravitational-wave memory, and the super center-of-mass charges are associated with total (ordinary plus null) gravitational-wave memory, in the terminology of Bieri and Garfinkle. Superspin charges are associated with the ordinary piece of spin memory. Some of these charges can give rise to black-hole hair, as described by Strominger and Zhiboedov. We clarify how this hair evades the no-hair theorems.
description: 18 pages, 1 table, no figures; some corrections and generalizations in v2; additional clarifications, corrections, and generalizations in v3; new table and subsection in v4; error in BMS transformation formula corrected in v5
Golius and Tychsen and Their Quest for Manuscripts. Three Arabic Letters
Creators: name: Liebrenz, Boris
Publisher: name: [Universitäts- und Landesbibliothek Sachsen-Anhalt], [Halle, Saale]
Year: 2017
Subjects: subject: 900

description: Letters exchanged between early modern Orientalist scholars and their correspondents from the Islamic world are a major source for our knowledge of the networks that facilitated the acquisition of Oriental manuscripts. They are equally important for the study of Arabic epistolography in the period. This contribution adds to the growing corpus with the edition and analysis of three such letters concerning the acquisition of manuscripts. The first two were written by Jacobus Golius (1596–1667) in 1624 and probably 1644, while the third was adressed by Aḥmad ʿAzmī, the Ottoman ambassador to Prussia, to Oluf Gerhard Tychsen (1734–1815) in 1791.
Nonminimally coupled topological-defect boson stars: Static solutions
Creators: name: Reid, Gray D.
name: Choptuik, Matthew W.
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider spherically symmetric static composite structures consisting of a boson star and a global monopole, minimally or non-minimally coupled to the general relativistic gravitational field. In the non-minimally coupled case, Marunovic and Murkovic have shown that these objects, so-called boson D-stars, can be sufficiently gravitationally compact so as to potentially mimic black holes. Here, we present the results of an extensive numerical parameter space survey which reveals additional new and unexpected phenomenology in the model. In particular, focusing on families of boson D-stars which are parameterized by the central amplitude of the boson field, we find configurations for both the minimally and non-minimally coupled cases that contain one or more shells of bosonic matter located far from the origin. In parameter space, each shell spontaneously appears as one tunes through some critical central amplitude of the boson field. In some cases the shells apparently materialize at spatial infinity: in these instances their areal radii are observed to obey a universal scaling law in the vicinity of the critical amplitude. We derive this law from the equations of motion and the asymptotic behavior of the fields.
description: 17 pages, 24 figures
Normalizing and classifying shape indexes of cities by ideas from fractals
Creators: name: Chen, Yanguang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: A standard scientific study comprises two processes: one is to describe a thing, and the other is to understand how the thing works. In order to understand the principle of urban growth, a number of shape indexes are proposed to describe the size and shape of cities. However, the comparability of a shape index is often influenced by the resolution of remote sensing images or digital maps because the calculated values depend on spatial measurement scales. This paper is devoted to exploring the scaling in classical shape indexes with mathematical methods. Two typical regular fractals, Koch's island and Vicsek's figure, are employed to illustrate the property of scale dependence of many shape indexes. A set of formula are derived from the geometric measure relation to associate fractal dimension for boundary lines with shape indexes. Based on the ideas of fractals, two main problems are solved in this work. First, several different correlated shape indexes such as circularity ratios and compactness ratios are normalized and unified by substituting Feret's diameter for the major axis of urban figure. Second, three levels of scaling in shape indexes are revealed, and shape indexes are classified into three groups. The significance of this study lies in two aspects. One is helpful for realizing the deep structure of urban form, and the other is useful for clarifying the spheres of application of different types of shape indexes.
description: 23 pages, 5 figures, 6 tables
One-Shot Device Testing Data Analysis under Logistic-Exponential Lifetimes with an Application to SEER Gallbladder Cancer Data
Creators: name: Baghel, Shanya
name: Mondal, Shuvashree
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: In the literature, the reliability analysis of one-shot devices is found under accelerated life testing in the presence of various stress factors. The application of one-shot devices can be extended to the bio-medical field, where we often evidence that inflicted with a certain disease, survival time would be under different stress factors like environmental stress, co-morbidity, the severity of disease etc. This work is concerned with a one-shot device data analysis and applies it to SEER Gallbladder cancer data. The two-parameter logistic exponential distribution is applied as a lifetime distribution. For robust parameter estimation, weighted minimum density power divergence estimators (WMDPDE) is obtained along with the conventional maximum likelihood estimators (MLE). The asymptotic behaviour of the WMDPDE and the robust test statistic based on the density power divergence measure are also studied. The performances of estimators are evaluated through extensive simulation experiments. Later those developments are applied to SEER Gallbladder cancer data. Citing the importance of knowing exactly when to inspect the one-shot devices put to the test, a search for optimum inspection times is performed. This optimization is designed to minimize a defined cost function which strikes a trade-off between the precision of the estimation and experimental cost. The search is accomplished through the population-based heuristic optimization method Genetic Algorithm.
Dynamical Models of Elliptical Galaxies -- II. M87 and its Globular Clusters
Creators: name: Agnello, A.
name: Evans, N. W.
name: Romanowsky, A. J.
name: Brodie, J. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the Globular Cluster (GC) system of the nearby elliptical galaxy M87 using the newly available dataset with accurate kinematics (Strader et al.2011). We find evidence for three distinct sub-populations of GCs in terms of colours, kinematics and radial profiles. We show that a decomposition into three populations (blue, intermediate and red GCs) is statistically preferred to one with two or four populations, and relate them to the stellar profile. We exploit the sub-populations to derive dynamical constraints on the mass and Dark Matter (DM) content of M87 out to $\sim100$ kpc. We use a class of global mass-estimators (from Paper I), obtaining mass measurements at different locations. M87's DM fraction changes from $\approx$0.2 at the starlight's effective radius (6 kpc) to $\approx$0.95 at the distance probed by the most extended, blue GCs (135 kpc). We supplement this with \textit{virial decompositions}, exploiting the dynamical model to produce a separation into multiple components. These yield the luminous mass as $5.5^{+1.5}_{-2.0}\times 10^{11}M_\odot$ and the DM within 135 kpc as $8.0^{+1.0}_{-4.0}\times 10^{12}M_\odot.$ The inner DM density behaves as $ρ\sim r^{-γ}$ with $γ\approx 1.6$. This is steeper than the cosmologically preferred cusp $ρ\sim r^{-1},$ providing evidence of DM contraction. Finally, we combine the GC separation into three sub-populations and the Jeans equations, obtaining information on the orbits of the GC system. The centrally concentrated red GCs exhibit tangential anisotropy, consistent with radial-orbit depletion by tidal shredding. The most extended blue GCs have an isotropic velocity dispersion tensor in the central parts, which becomes more tangential moving outwards, consistent with adiabatic contraction of the DM halo.
description: MNRAS (submitted), 16 pages, 10 figures
title: К вопросу о первых руководителях нефтегазовой сферы Тюменской области в Ханты-Мансийском автономном округе
title: About the First Oil and Gas Industry Leaders of the Tyumen Region in the Khanty-Mansiysk Autonomous Okrug
Creators: name: Колева, Галина Юрьевна
Publisher: name: Издательский центр СурГУ
Year: 2022

description: В статье реализуется основная цель – раскрыть на основании данных, выявленных в документах архивов Тюменской области (Государственный архив Тюменской области и Государственный архив социально-политической истории Тюменской области), имена первых руководителей начального этапа становления нефтегазовой сферы Тюменской области, выделить основные
черты их биографий, уровень образования, профессионального опыта. Отмечается, что основной территорией деятельности персонажей была территория Ханты-Мансийского округа, в тот период именуемого не автономным, а национальным. Именно там разворачивались процессы формирования
основ добывающих отраслей Западной Сибири.
description: The main goal of the article is to reveal the names of the first leaders of the Tyumen region
oil and gas industry in the initial phase of its development and to highlight the main features of their biography, the level of education and professional experience based on the data received from the records of the
Tyumen region archives (Gosudarstvennyi Arkhiv Tyumenskoi Oblasti (GATO) and Gosudarstvennyi
Arkhiv Sotsialno-Politicheskoi Istorii Tyumenskoi Oblasti (GASPITO). It is noted that the Khanty-Mansiysk
Okrug was the main territory of their activity. In those days, the Okrug was referred to as National, not Autonomous. It was the place where the basis of West Siberian extractive industries was formed.
Jordan triple product homomorphisms on Hermitian matrices of dimension two
Creators: name: Bukovsek, Damjana Kokol
name: Mojskerc, Blaz
Publisher: name: arXiv
Year: 2015
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16W10, 16W20, 15B57

description: We characterise all Jordan triple product homomorphisms, that is, mappings $Φ$ satisfying $$ Φ(ABA) = Φ(A)Φ(B)Φ(A) $$ on the set of all Hermitian $2 \times 2$ complex matrices.
description: 34 pages
Optimal transport for a novel event description at hadron colliders
Creators: name: Gouskos, Loukas
name: Iemmi, Fabio
name: Liechti, Sascha
name: Maier, Benedikt
name: Mikuni, Vinicius
name: Qu, Huilin
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a novel strategy for disentangling proton collisions at hadron colliders such as the LHC that considerably improves over the current state of the art. Employing a metric inspired by optimal transport problems as the cost function of a graph neural network, our algorithm is able to compare two particle collections with different noise levels and learns to flag particles originating from the main interaction amidst products from up to 200 simultaneous pileup collisions. We thereby sidestep the critical task of obtaining a ground truth by labeling particles and avoid arduous human annotation in favor of labels derived in situ through a self-supervised process. We demonstrate how our approach - which, unlike competing algorithms, is trivial to implement - improves the resolution in key objects used in precision measurements and searches alike and present large sensitivity gains in searching for exotic Higgs boson decays at the High-Luminosity LHC.
description: 12 pages, 5 figures
Causal effects of stock market on corporate decisions, disclosure mandates, and informational feedback
Creators: name: Jiang, Jinglin
Publisher: name: No Publisher Supplied
Year: 2017

description: The accounting literature has long recognized that maintaining or increasing stock prices isone of the most important factors for managers’ reporting and disclosure decisions, how-ever, the extant literature mainly examines the reverse causality (i.e., the effect of voluntaryearnings forecasts or earnings management on stock prices), due to endogeneity concerns.Chapter 1 examines managers’ decisions on information disclosure in response to stock-underpricing. Using mutual fund fire sales as an exogenous source of market-disruption,we find some managers increase frequency/precision of earnings guidance in response tostock-underpricing. Other managers, especially those in firms with poorer performanceand more short-term-oriented investors, engage in accrual-based earnings management.The passage of SOX, however, affects firms’ response to fire sales, with firms increasingtheir reliance on guidance as opposed to earnings management. The shift is associatedwith faster post-fire-sales price recovery, suggesting that enhancing information disclosurerather than information manipulation is effective in correcting stock-underpricing.The SEC promulgated Regulation Fair Disclosure (Reg FD) to establish a “level play-ing field”for investors through prohibiting the use of selective disclosure. In Chapter 2, weuse Reg FD as a plausibly natural experiment to evaluate links between disclosure, privateinformation production, and real efficiency. We find that the rule has an adverse impact onprice informativeness, investment-to-price sensitivity, and firm valuewith stronger effectsfor firms with greater prior reliance on selective disclosure. Analyst forecast quality alsoappears to decline following the rule change. Interestingly, the impact of Reg FD on priceinformativeness and the sensitivity of investment-to-price diminishes over time, while the deterioration in analyst forecasts tends to persist. Collectively, the results highlight unin-tended consequences of Reg FD in inhibiting private information acquisition and, thereby,the informational feedback from stock prices to real decisions.
Infinite Lexicographic Products
Creators: name: Meir, Nadav
Publisher: name: arXiv
Year: 2017
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03C10, 03C20, 03C75, 05D10, 05C55

description: We generalize the lexicographic product of first-order structures by presenting a framework for constructions which, in a sense, mimic iterating the lexicographic product infinitely and not necessarily countably many times. We then define dense substructures in infinite products and show that any countable product of countable transitive homogeneous structures has a unique countable dense substructure, up to isomorphism. Furthermore, this dense substructure is transitive, homogeneous and elementarily embeds into the product. This result is then utilized to construct a rigid elementarily indivisible structure.
description: 20 pages, 3 figures
Herschel imaging and spectroscopy of the nebula around the luminous blue variable star WRAY 15-751
Creators: name: Vamvatira-Nakou, C.
name: Hutsemekers, D.
name: Royer, P.
name: Naze, Y.
name: Magain, P.
name: Exter, K.
name: Waelkens, C.
name: Groenewegen, M. A. T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have obtained far-infrared Herschel PACS imaging and spectroscopic observations of the nebular environment of the luminous blue variable WRAY 15-751. These images clearly show that the main, dusty nebula is a shell of radius 0.5 pc and width 0.35 pc extending outside the H-alpha nebula. They also reveal a second, bigger and fainter dust nebula, observed for the first time. Both nebulae lie in an empty cavity, likely the remnant of the O-star wind bubble formed when the star was on the main sequence. The kinematic ages of the nebulae are about 20000 and 80000 years and each nebula contains about 0.05 Msun of dust. Modeling of the inner nebula indicates a Fe-rich dust. The far-infrared spectrum of the main nebula revealed forbidden emission lines coming from ionized and neutral gas. Our study shows that the main nebula consists of a shell of ionized gas surrounded by a thin photodissociation region illuminated by an "average" early-B star. The derived abundance ratios N/O=1.0+/-0.4 and C/O=0.4+/-0.2 indicate a mild N/O enrichment. We estimate that the inner shell contains 1.7+/-0.6 Msun of gas. Assuming a similar dust-to-gas ratio for the outer nebula, the total mass ejected by WRAY 15-751 amounts to 4+/-2 Msun. The measured abundances, masses and kinematic ages of the nebulae were used to constrain the evolution of the star and the epoch at which the nebulae were ejected. Our results point to an ejection of the nebulae during the RSG evolutionary phase of an ~ 40 Msun star. The presence of multiple shells around the star suggests that the mass-loss was not a continuous ejection but rather a series of episodes of extreme mass-loss. Our measurements are compatible with the recent evolutionary tracks computed for an 40 Msun star with little rotation. They support the O-BSG-RSG-YSG-LBV filiation and the idea that high-luminosity and low-luminosity LBVs follow different evolutionary paths.
description: 19 pages, 13 figures, accepted for publication in A&A
The two-point resistance of fan networks
Creators: name: Izmailian, N. Sh.
name: Kenna, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The problem of the two-point resistance in various networks has recently received considerable attention. Here we consider the problem on a fan-resistor network, which is a segment of the cobweb network. Using a recently developed approach, we obtain the exact resistance between two arbitrary nodes on such a network. As a byproduct, the analysis also delivers the solution of the spanning tree problem on the fan network.
description: 10 pages, 1 figure
Newton's method in practice II: The iterated refinement Newton method and near-optimal complexity for finding all roots of some polynomials of very large degrees
Creators: name: Randig, Marvin
name: Schleicher, Dierk
name: Stoll, Robin
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 49M15, 65H04, 37F10, 37N30, 37-04, 65-04

description: We present a practical implementation based on Newton's method to find all roots of several families of complex polynomials of degrees exceeding one billion ($10^9$) so that the observed complexity to find all roots is between $O(d\ln d)$ and $O(d\ln^3 d)$ (measuring complexity in terms of number of Newton iterations or computing time). All computations were performed successfully on standard desktop computers built between 2007 and 2012.
description: 24 pages, 19 figures. Update in v2 incorporates progress on polynomials of even higher degrees (greater than 1 billion)
The Emergent 1.1-1.7 Micron Spectrum of the Exoplanet CoRoT-2b as Measured Using the Hubble Space Telescope
Creators: name: Wilkins, Ashlee
name: Deming, Drake
name: Madhusudhan, Nikku
name: Burrows, Adam
name: Knutson, Heather
name: McCullough, Peter
name: Ranjan, Sukrit
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We have used Hubble/WFC3 and the G141 grism to measure the secondary eclipse of the transiting very hot Jupiter CoRoT-2b in the 1.1-1.7$μ$m spectral region. We find an eclipse depth averaged over this band equal to $395^{+69}_{-45}$ parts per million, equivalent to a blackbody temperature of $1788\pm18$K. We study and characterize several WFC3 instrumental effects, especially the "hook" phenomenon described by Deming et al. (2013). We use data from several transiting exoplanet systems to find a quantitative relation between the amplitude of the hook and the exposure level of a given pixel. Although the uncertainties in this relation are too large to allow us to develop an empirical correction for our data, our study provides a useful guide for optimizing exposure levels in future WFC3 observations. We derive the planet's spectrum using a differential method. The planet-to-star contrast increases to longer wavelength within the WFC3 bandpass, but without water absorption or emission to a $3σ$ limit of 85 ppm. The slope of the WFC3 spectrum is significantly less than the slope of the best-fit blackbody. We compare all existing eclipse data for this planet to a blackbody spectrum, and to spectra from both solar abundance and carbon-rich (C/O=1) models. A blackbody spectrum is an acceptable fit to the full dataset. Extra continuous opacity due to clouds or haze, and flattened temperature profiles, are strong candidates to produce quasi-blackbody spectra, and to account for the amplitude of the optical eclipses. Our results show ambiguous evidence for a temperature inversion in this planet.
description: 18 pages, 14 figures. Accepted for publication in ApJ on 1/16/2014
Fourier-based numerical approximation of the Weertman equation for moving dislocations
Creators: name: Josien, Marc
name: Pellegrini, Yves-Patrick
name: Legoll, Frédéric
name: Bris, Claude Le
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This work discusses the numerical approximation of a nonlinear reaction-advection-diffusion equation, which is a dimensionless form of the Weertman equation. This equation models steadily-moving dislocations in materials science. It reduces to the celebrated Peierls-Nabarro equation when its advection term is set to zero. The approach rests on considering a time-dependent formulation, which admits the equation under study as its long-time limit. Introducing a Preconditioned Collocation Scheme based on Fourier transforms, the iterative numerical method presented solves the time-dependent problem, delivering at convergence the desired numerical solution to the Weertman equation. Although it rests on an explicit time-evolution scheme, the method allows for large time steps, and captures the solution in a robust manner. Numerical results illustrate the efficiency of the approach for several types of nonlinearities.
description: 21 pages, 12 figures, 2 tables
*nackt werden: The combinatorial restrictions of the German copula werden and the notion of control
Creators: name: Härtl, Holden
Publisher: name: Universität Kassel
Year: 2005
Subjects: subject: 400
subject: Grammatiktheorie
subject: Verbalisierung
subject: Kopula
subject: Attributives Adjektiv
subject: Mentales Lexikon

description: The work I am reporting on in this paper was mainly accomplished at the Centre for General Linguistics, Typology and Universals Research (ZAS Berlin) within the project "Copula-Predicative Constructions" (Prof. Dr. Ewald Lang) of the Deutsche Forschungsgemeinschaft (DFG).
Rupture and afterslip controlled by spontaneous local fluid flow in crustal rock
Creators: name: Aben, Frans M.
name: Brantut, Nicolas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Shear rupture and fault slip in crystalline rocks like granite produce large dilation, impacting the spatiotemporal evolution of fluid pressure in the crust during the seismic cycle. To explore how fluid pressure variations are coupled to rock deformation and fault slip, we conducted laboratory experiments under upper crustal conditions while monitoring acoustic emissions and in situ fluid pressure. Our results show two separate faulting stages: initial rupture propagation, associated with large dilatancy and stabilised by local fluid pressure drops, followed by sliding on the newly formed fault, promoted by local fluid pressure recharge from the fault walls. This latter stage had not been previously recognised and can be understood as fluid-induced afterslip, co-located with the main rupture patch. Upscaling our laboratory results to the natural scale, we expect that spontaneous fault zone recharge could be responsible for early afterslip in locally dilating regions of major crustal faults, independently from large-scale fluid flow patterns.
Learning the Fundamental MIR Spectral Components of Galaxies with Non-Negative Matrix Factorisation
Creators: name: Hurley, P. D.
name: Oliver, S.
name: Farrah, D.
name: Lebouteiller, V.
name: Spoon, H. W. W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The mid-infrared (MIR) spectra observed with the \textit{Spitzer} Infrared Spectrograph (IRS) provide a valuable dataset for untangling the physical processes and conditions within galaxies. This paper presents the first attempt to blindly learn fundamental spectral components of MIR galaxy spectra, using non-negative matrix factorisation (NMF). NMF is a recently developed multivariate technique shown to be successful in blind source separation problems. Unlike the more popular multivariate analysis technique, principal component analysis, NMF imposes the condition that weights and spectral components are non-negative. This more closely resembles the physical process of emission in the mid-infrared, resulting in physically intuitive components. By applying NMF to galaxy spectra in the Cornell Atlas of Spitzer/IRS sources (CASSIS), we find similar components amongst different NMF sets. These similar components include two for AGN emission and one for star formation. [... ABBREVIATED...] We show an NMF set with seven components can reconstruct the general spectral shape of a wide variety of objects, though struggle to fit the varying strength of emission lines. We also show that the seven components can be used to separate out different types of objects. We model this separation with Gaussian Mixtures modelling and use the result to provide a classification tool. We also show the NMF components can be used to separate out the emission from AGN and star formation regions and define a new star formation/AGN diagnostic which is consistent with all mid-infrared diagnostics already in use but has the advantage that it can be applied to mid-infrared spectra with low signal to noise or with limited spectral range. The 7 NMF components and code for classification are made public on arxiv and are available at: \url{https://github.com/pdh21/NMF_software/}
description: 23 pages, 19 figures, accepted for publication in MNRAS
The étale cohomology ring of the ring of integers of a number field
Creators: name: Ahlqvist, Eric
name: Carlson, Magnus
Publisher: name: arXiv
Year: 2018
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11R34, 14F20

description: We compute the étale cohomology ring $H^*(\text{Spec } \mathcal{O}_K,\mathbb{Z}/n\mathbb{Z})$ where $\mathcal{O}_K$ is the ring of integers of a number field $K.$ As an application, we give a non-vanishing formula for an invariant defined by Minhyong Kim.
description: To be published in Research in Number Theory, 25 pages
Atiyah classes and Todd classes of pullback dg Lie algebroids associated with Lie pairs
Creators: name: Liao, Hsuan-Yi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: Algebraic Topology (math.AT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: For a Lie algebroid $L$ and a Lie subalgebroid $A$, i.e. a Lie pair $(L,A)$, we study the Atiyah class and the Todd class of the pullback dg (i.e. differential graded) Lie algebroid $π^! L$ of $L$ along the bundle projection $π:A[1] \to M$ of the shifted vector bundle $A[1]$. Applying the homological perturbation lemma, we provide a new construction of Stiénon--Vitagliano--Xu's contraction relating the cochain complex $\big(Γ(π^! L),\mathit{Q}\big)$ of sections of $π^! L$ to the Chevalley--Eilenberg complex $(Γ(Λ^\bullet A^\vee\otimes(L/A)),d^{\mathrm{Bott}})$ of the Bott representation. Using this contraction, we construct two isomorphisms: the first identifies the cohomology of the cochain complex $(Γ((π^! L)^\vee\otimes\mathrm{End}(π^! L)),\mathit{Q})$ with the Chevalley--Eilenberg cohomology $H^\bullet_{\mathrm{CE}}(A,(L/A)^\vee\otimes\mathrm{End}(L/A))$ arising from the Bott representation, while the second identifies the cohomologies $H^\bullet(Γ(Λ(π^! L)^\vee),\mathit{Q})$ and $H^\bullet_{\mathrm{CE}}(A,Λ(L/A)^\vee)$. We prove that this pair of isomorphisms identifies the Atiyah class and the Todd class of the dg Lie algebroid $π^! L$ with the Atiyah class and the Todd class of the Lie pair $(L,A)$, respectively.
description: 28 pages. Some examples and references added. Some typos corrected. Application to g-manifolds added. To appear in Communications in Mathematical Physics
title: От «Нефтчи» до «Геолога»: футбол в жизни Ф. К. Салманова
title: From “Neftchi” to “Geolog”: Football in Farman K. Salmanov’s Life
Creators: name: Рашевский, Василий Викторович
Publisher: name: Издательский центр СурГУ
Year: 2022

description: Актуальность статьи обусловлена малой изученностью отдельных эпизодов биографии одного из первооткрывателей нефти в Западной Сибири Ф. К. Салманова. В его жизни,
наполненной событиями активного нефтепоиска и открытиями месторождений нефти и газа, нашлось
место для самой популярной в мире игры – футбола. Эта игра, восхитившая Салманова с детских лет,
определила черты его характера и смогла стать одной из любимых в среде тюменских геологоразведчиков. Ф. К. Салманов сыграл значительную роль во включении этой игры в досуг работников геологической отрасли, а также способствовал развитию футбола на территории Тюменской области.
Это позволило сформировать интерес к активному досугу у работников геологии, что благотворно
отражалось на их состоянии здоровья в сложных северных условиях. Футбольное наследие, остававшееся в сибирских поселениях после Фармана Салманова, продолжало свою работу долгие годы.
На заложенной базе начал развиваться профессиональный спорт в Тюменской области, который и на
сегодняшний день представлен в футбольном пространстве страны. Цель статьи – проанализировать
вклад Ф. К. Салманова в развитие футбола на территории Тюменской области. Новые факты, полученные в результате подготовки статьи, позволят обогатить сведения об одном из легендарных геологов советского и российского периодов, раскрыть многогранность его личности и роль в истории
нашего региона.

description: The relevance of the article is due to the poor study of separate episodes of the biography
of one of oil discoverers in West Siberia, Farman K. Salmanov. In his life full of active oil searching and
discovering oil and gas fields, there was a place for the most popular game in the world – football. Since he
was a child Salmanov had been delighted with this game, thus, it had an impact on his character traits and
became one of the most favorite games among Tyumen exploration geologists. Farman K. Salmanov played a significant part in making this game one of the leisure activities of geologists and also contributed to the
development of football in the Tyumen Region. It allowed stimulating geologists’ interest in active leisure,
which was beneficial to their health in severe northern conditions. Football legacy left in Siberian settlements
by Farman K. Salmanov continued to exist for many years. On the provided basis professional sport started
to develop in the Tyumen region. It is present in the Russian football today. The purpose of the article is to
analyze Farman Salmanov’s contribution to football development in the Tyumen Region. New facts obtained
during preparation of the article will complement the facts already known about one of the legendary Soviet
and Russian geologists, the versatility of his personality and his role in the history of our region.
A unification of the coding theory and OAQEC perspective on hybrid codes
Creators: name: Majidy, Shayan
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: There is an advantage in simultaneously transmitting both classical and quantum information over a quantum channel compared to sending independent transmissions. The successful implementation of simultaneous transmissions of quantum and classical information will require the development of hybrid quantum-classical error-correcting codes, known as hybrid codes. The characterization of hybrid codes has been performed from a coding theory perspective and an operator algebra quantum error correction (OAQEC) perspective. First, we demonstrate that these two perspectives are equivalent and that the coding theory characterization is a specific case of the OAQEC model. Second, we include a generalization of the quantum Hamming bound for hybrid error-correcting codes. We discover a necessary condition for developing non-trivial hybrid codes -- they must be degenerate. Finally, we construct an example of a non-trivial degenerate 4-qubit hybrid code.
description: 4 pages
Luttinger parameters of interacting fermions in 1D at high energies
Creators: name: Tsyplyatyev, O.
name: Schofield, A. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Interactions between electrons in one-dimension are fully described at low energies by only a few parameters of the Tomonaga-Luttinger model which is based on linearisation of the spectrum. We consider a model of spinless fermions with a short range interaction via the Bethe-Ansatz technique and show that a Luttinger parameter emerges in an observable beyond the low energy limit. A distinct feature of the spectral function, the edge that marks the lowest possible excitation energy for a given momentum, is parabolic for arbitrary momenta and the prefactor is a function of the Luttinger parameter, K.
description: 7 pages, 4 figures
Stability estimates for the expected utility in Bayesian optimal experimental design
Creators: name: Duong, Duc-Lam
name: Helin, Tapio
name: Rojo-Garcia, Jose Rodrigo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistics Theory (math.ST)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 62K05, 62G20, 65J22

description: We study stability properties of the expected utility function in Bayesian optimal experimental design. We provide a framework for this problem in a non-parametric setting and prove a convergence rate of the expected utility with respect to a likelihood perturbation. This rate is uniform over the design space and its sharpness in the general setting is demonstrated by proving a lower bound in a special case. To make the problem more concrete we proceed by considering non-linear Bayesian inverse problems with Gaussian likelihood and prove that the assumptions set out for the general case are satisfied and regain the stability of the expected utility with respect to perturbations to the observation map. Theoretical convergence rates are demonstrated numerically in three different examples.
description: 21 pages; 6 figures
Observations of "Fresh" and Weathered Surfaces on Asteroid Pairs and Their Implications on the Rotational-Fission Mechanism
Creators: name: Polishook, David
name: Moskovitz, Nicholas
name: Binzel, Richard P.
name: DeMeo, Francesca E.
name: Vokrouhlický, David
name: Žižka, Jindřich
name: Oszkiewicz, Dagmara
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The rotational-fission of a rubble-pile asteroid can result in an "asteroid pair", two un-bound asteroids sharing similar orbits. This mechanism might exposes material that previously had never have been exposed to the weathering conditions of space. Therefore, the surfaces of asteroid pairs offer the opportunity to observe non-weathered fresh spectra. We report near-IR spectroscopic observations of 31 asteroids in pairs. We analyze their spectral slopes, 1 μm absorption band, taxonomy, and estimate the time elapsed since their separation. Analyzing the 19 S-complex objects in our sample, we find two fresh Q-type asteroids that are the first of their kind to be observed in the main-belt over the full visible and near-IR range. This solidly demonstrates that Q-type objects are not limited to the NEA population. The pairs in our sample present a range of fresh and weathered surfaces with no clear evidence for a correlation with the ages of the pairs. However, our sample includes old pairs (1 to 2 My) that present low spectral slopes. This illustrates a timescale of at least ~2 My before an object develops high spectral slope that is typical for S-type asteroids. We discuss mechanisms that explain the existence of weathered pairs with young dynamical ages and find that the "secondary fission" model (Jacobson & Scheeres 2011) is the most robust with our observations since: 1) the secondary members in our sample present fresh parameters that tend to be fresher than their weathered primaries; 2) most of the fresh pairs in our sample have low size ratios between the secondary and the primary; 3) 33% of the primaries in our sample are fresh, similar to the prediction set by this model; 4) known satellites orbit two of the pairs in our sample with low size ratio and fresh surface; 5) there is no correlation between the weathering state and the primary shape as predicted by other models.
description: 19 pages, 17 figures, 4 tables. Accepted to Icarus
Asymmetric linkages: maxmin vs. reflected maxmin copulas
Creators: name: Bukovšek, Damjana Kokol
name: Košir, Tomaž
name: Mojškerc, Blaž
name: Omladič, Matjaž
Publisher: name: arXiv
Year: 2018
Subjects: subject: Statistics Theory (math.ST)
subject: Probability (math.PR)
subject: Risk Management (q-fin.RM)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: Primary: 60E05, Secondary: 60E15, 62N05

description: In this paper we introduce some new copulas emerging from shock models. It was shown earlier that reflected maxmin copulas (RMM for short) are not just some specific singular copulas; they contain many important absolutely continuous copulas including the negative quadrant dependent part of the Eyraud-Farlie-Gumbel-Morgenstern class. The main goal of this paper is to develop the RMM copulas with dependent endogenous shocks and give evidence that RMM copulas may exhibit some characteristics better than the original maxmin copulas (MM for short): (1) An important evidence for that is the iteration procedure of the RMM transformation which we prove to be always convergent and we give many properties of it that are useful in applications. (2) Using this result we find also the limit of the iteration procedure of the MM transformation thus answering a question proposed earlier by Durante, Omladič, Oražem, and Ružić. (3) We give the multivariate dependent RMM copula that compares to the MM version given by Durante, Omladič, Oražem, and Ružić. In all our copulas the idiosyncratic and systemic shocks are combined via asymmetric linking functions as opposed to Marshall copulas where symmetric linking functions are used.
description: 31 pages, 8 figures
Implementation Challenges of ERP Project a Case of Commercial Bank of Ethiopia
Creators: name: TSEDALE AKALE H/GIORGIS
Publisher: name: Zenodo
Year: 2018

description: The objective of this study is to identify challenges facing the implementation of enterprise resource planning at commercial bank of Ethiopia. As result, the researcher has identifying the implementation challenges by selecting organizational, technological and individual variables and other related concepts. To address this study, descriptive research method was employed and both qualitative and quantitative approaches were used. Accordingly questionnaires, interview and document analysis were used as data collection instrument. The data obtained through questionnaire has been analyzed quantitatively using descriptive statistics: frequency, percentage, mean and standard deviation through SPSS version 21.00 software. Moreover, the data obtained using interviews has been analyzed qualitatively. Total population used to collect data was manager, team leaders and team members of the project which is a total of 150. The sampling design that was employed for this study was purposive sampling
The Swift/BAT Hard X-ray Transient Monitor
Creators: name: Krimm, Hans A.
name: Holland, Stephen T.
name: Corbet, Robin H. D.
name: Pearlman, Aaron B.
name: Romano, Patrizia
name: Kennea, Jamie A.
name: Bloom, Joshua S.
name: Barthelmy, Scott D.
name: Baumgartner, Wayne H.
name: Cummings, James R.
name: Gehrels, Neil
name: Lien, Amy Y.
name: Markwardt, Craig B.
name: Palmer, David M.
name: Sakamoto, Taka
name: Stamatikos, Michael
name: Ukwatta, Tilan N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Swift/Burst Alert Telescope (BAT) hard X-ray transient monitor provides near real-time coverage of the X-ray sky in the energy range 15-50 keV. The BAT observes 88% of the sky each day with a detection sensitivity of 5.3 mCrab for a full-day observation and a time resolution as fine as 64 seconds. The three main purposes of the monitor are (1) the discovery of new transient X-ray sources, (2) the detection of outbursts or other changes in the flux of known X-ray sources, and (3) the generation of light curves of more than 900 sources spanning over eight years. The primary interface for the BAT transient monitor is a public web page. Between 2005 February 12 and 2013 April 30, 245 sources have been detected in the monitor, 146 of them persistent and 99 detected only in outburst. Among these sources, 17 were previously unknown and were discovered in the transient monitor. In this paper, we discuss the methodology and the data processing and filtering for the BAT transient monitor and review its sensitivity and exposure. We provide a summary of the source detections and classify them according to the variability of their light curves. Finally, we review all new BAT monitor discoveries; for the new sources that are previously unpublished, we present basic data analysis and interpretations.
description: Accepted for publication in the Astrophysical Journal Supplement Series; 85 pages, 22 figures
Introduction to nucleotide sequence analysis and protein modeling in MEGA and PyMol using coronavirus SARS-CoV-2
Creators: name: Shumskaya, Maria
name: Lorusso, Nicholas
Publisher: name: QUBES Educational Resources
Year: 2020

description: Introduction into computational approaches in phylogeny and protein modeling based on coronavirus SARS-CoV-2 (caused COVID-19 pandemic). Two self-guided tutorials for standard lab classes of 2.5 hours. Level: undergraduate students majoring in biology.
Classification of full exceptional collections of line bundles on three blow-ups of $\mathbb{P}^{3}$
Creators: name: Liu, Wanmin
name: Yang, Song
name: Yu, Xun
Publisher: name: arXiv
Year: 2018
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14F05, 14J45, 18E30

description: A fullness conjecture of Kuznetsov says that if a smooth projective variety $X$ admits a full exceptional collection of line bundles of length $l$, then any exceptional collection of line bundles of length $l$ is full. In this paper, we show that this conjecture holds for $X$ as the blow-up of $\mathbb{P}^{3}$ at a point, a line, or a twisted cubic curve, i.e. any exceptional collection of line bundles of length 6 on $X$ is full. Moreover, we obtain an explicit classification of full exceptional collections of line bundles on such $X$.
description: 28 pages. To appear in Journal of the Korean Mathematical Society, A previous version with a different title appeared as [CGP17025] at https://cgp.ibs.re.kr/archive/preprints/2017