cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
New Approach in Dealing with the Non-Negativity of the Conditional Variance in the Estimation of GARCH Model
Creators: name: ABDELJALIL SETTAR, NADIA IDRISSI FATMI
Publisher: name: Oddział PAN w Łodzi
Year: 2021
Subjects: GARCH, Kalman Filter, Conditional variance, Volatility,, Quasi-maximum likelihood.

description: The Central European Journal of Economic Modelling and Econometrics (CEJEME) is a quarterly international journal. It aims to publish articles focusing on mathematical or statistical models in economic sciences. Papers covering the application of existing econometric techniques to a wide variety of problems in economics, in particular in macroeconomics and finance are welcome. Advanced empirical studies devoted to modelling and forecasting of Central and Eastern European economies are of particular interest. Any rigorous methods of statistical inference can be used and articles representing Bayesian econometrics are decidedly within the range of the Journal's interests.
Anomalous behavior of the Kramers rate at bifurcations in classical field theories
Creators: name: Berglund, Nils
name: Gentz, Barbara
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: PACS 05.40-a, 05.45.Yv, 11.10.Wx, 75.60.Jk

description: We consider a Ginzburg-Landau partial differential equation in a bounded interval, perturbed by weak spatio-temporal noise. As the interval length increases, a transition between activation regimes occurs, in which the classical Kramers rate diverges [R.S. Maier and D.L. Stein, Phys. Rev. Lett. 87, 270601 (2001)]. We determine a corrected Kramers formula at the transition point, yielding a finite, though noise-dependent prefactor, confirming a conjecture by Maier and Stein [vol. 5114 of SPIE Proceeding (2003)]. For both periodic and Neumann boundary conditions, we obtain explicit expressions of the prefactor in terms of Bessel and error functions.
Trade Implications of the Transatlantic Trade and Investment Partnership for Poland's Agri-Food Trade
Creators: name: JAN HAGEMEJER, JAN JAKUB MICHAŁEK
Publisher: name: Oddział PAN w Łodzi
Year: 2021
Subjects: TTIP, tariff equivalents of NTMs, general equilibrium models, partial equilibrium models, agri-food sector, Poland

description: The Central European Journal of Economic Modelling and Econometrics (CEJEME) is a quarterly international journal. It aims to publish articles focusing on mathematical or statistical models in economic sciences. Papers covering the application of existing econometric techniques to a wide variety of problems in economics, in particular in macroeconomics and finance are welcome. Advanced empirical studies devoted to modelling and forecasting of Central and Eastern European economies are of particular interest. Any rigorous methods of statistical inference can be used and articles representing Bayesian econometrics are decidedly within the range of the Journal's interests.
Antiferromagnetic transition in EuFe$_2$As$_2$: A possible parent compound for superconductors
Creators: name: Ren, Zhi
name: Zhu, Zengwei
name: Jiang, Shuai
name: Xu, Xiangfan
name: Tao, Qian
name: Wang, Cao
name: Feng, Chunmu
name: Cao, Guanghan
name: Xu, Zhu'an
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Ternary iron arsenide EuFe$_2$As$_2$ with ThCr$_2$Si$_2$-type structure has been studied by magnetic susceptibility, resistivity, thermopower, Hall and specific heat measurements. The compound undergoes two magnetic phase transitions at about 200 K and 20 K, respectively. The former was found to be accompanied with a slight drop in magnetic susceptibility (after subtracting the Curie-Weiss paramagnetic contribution), a rapid decrease in resistivity, a large jump in thermopower and a sharp peak in specific heat with decreasing temperature, all of which point to a spin-density-wave-like antiferromagnetic transition. The latter was proposed to be associated with an A-type antiferromagnetic ordering of Eu$^{2+}$ moments. Comparing with the physical properties of the iso-structural compounds BaFe$_2$As$_2$ and SrFe$_2$As$_2$, we expect that superconductivity could be induced in EuFe$_2$As$_2$ through appropriate doping.
description: 4 pages, 4 figures
Giant radio quasars: composite optical spectra
Creators: name: Kuźmicz, Agnieszka
name: Sethi, Sagar
name: Jamrozy, Marek
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the composite optical spectrum for the largest sample of giant radio quasars (GRQs). They represent a rare subclass of radio quasars due to their large projected linear sizes of radio structures, which exceed 0.7 Mpc. To construct the composite spectrum, we combined 216 GRQ's optical spectra from Sloan Digital Sky Survey (SDSS). As a result, we obtained the composite spectrum covering the wavelength range from 1400 Å to 7000 Å. We calculated the power-law spectral slope for GRQ's composite, obtaining $α_λ=-1.25$ and compared it with that of the smaller-sized radio quasars, as well as with the quasar composite spectrum obtained for large sample of SDSS quasars. We obtained that the GRQ's continuum is flatter (redder) than the continuum of comparison quasar samples. We also show that the continuum slope depends on core and total radio luminosity at 1.4 GHz, being steeper for higher radio luminosity bin. Moreover, we found the flattening of the continuum with an increase of the projected linear size of radio quasar. We show that $α_λ$ is orientation-dependent, being steeper for a higher radio core-to-lobe flux density ratio which is consistent with AGN unified model predictions. For two GRQs, we fit the spectral energy distribution using X-CIGALE code to compare the consistency of results obtained in the optical part of the electromagnetic spectrum with broad-band emission. The parameters obtained from the SED fitting confirmed the larger dust luminosity for the redder optical continuum.
description: 9 pages, 7 figures, accepted to publication in ApJ
Focus Group Discussion Script: The OSH-minded Designer
Creators: name: Ndekugri E. Issaka
name: Ankrah A. Nii
name: Adaku, Ebenezer
Publisher: name: Zenodo
Year: 2021
Subjects: Construction; Occupational Safety and Health; Risk Management; Health and Safety Coordination; Designer

description: Occupational safety and health (OSH) still remains a challenge to the construction industry world-wide and source of worry for industry stakeholders. The Construction (Design and Management) Regulations (CDM) have been the primary tool to drive changes in the management of health and safety in the UK construction industry. Five (5) years after its latest Regulations (CDM 2015), there is a need for introspection, stock-taking and honest discussion on current practice and how to manage more collaboratively OSH risks on construction projects. This focus group discussion script aimed to capture industry feedback on experiences and views regarding the implementation of CDM 2015 at the pre-construction stage of construction projects with a focus on the role of the CDM Designer.
title: Rezension: "Wir Unsichtbaren. Geschichte der Polen in Deutschland"/ Peter Oliver Loew. München: C.H.Beck, 2014. ISBN 978-3-406-66708-4
Creators: name: Miedema, Christie
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: „Polen in Deutschland lassen sich nur schwer zählen", beginnt Peter Oliver Loew vom Deutschen Polen-Institut Darmstadt seine Studie über Polen in Deutschland. „Es gibt Aussiedler und Spätaussiedler, die sich nie zu einer polnischen Identität bekannten, aber daheim Polnisch – nicht selten oberschlesische Mundart – sprachen und sprechen. Es gibt aber auch Aussiedler, die all ihren Ehrgeiz aufwendeten, um sich möglichst rasch zu integrieren, und mit ihren Kindern Deutsch radebrechten (…). Menschen sind darunter, die aus wirtschaftlichen oder politischen Gründen zugewandert sind (…) Saisonarbeiter (…) Nachkommen von Versprengten des Zweiten Weltkriegs oder auch der Arbeitsmigranten aus Vorkriegszeiten, Studierende, Künstler, Intellektuelle, Prostituierte, Diebe und Obdachlose" (S. 9).
Logarithmic Sobolev inequalities: regularizing effect of Lévy operators and asymptotic convergence in the Lévy-Fokker-Planck equation
Creators: name: Gentil, Ivan
name: Imbert, Cyril
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: In this paper we study some applications of the Lévy logarithmic Sobolev inequality to the study of the regularity of the solution of the fractal heat equation, i. e. the heat equation where the Laplacian is replaced with the fractional Laplacian. It is also used to the study of the asymptotic behaviour of the Lévy-Ornstein-Uhlenbeck process.
The Star Formation Reference Survey. IV. Stellar mass distribution of local star-forming galaxies
Creators: name: Bonfini, Paolo
name: Zezas, Andreas
name: Ashby, Matthew L. N.
name: Willner, Steven P.
name: Maragkoudakis, Alexandros
name: Kouroumpatzakis, Konstantinos
name: Sell, Paul. H.
name: Kovlakas, Konstantinos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We constrain the mass distribution in nearby, star-forming galaxies with the Star Formation Reference Survey (SFRS), a galaxy sample constructed to be representative of all known combinations of star formation rate (SFR), dust temperature, and specific star formation rate (sSFR) that exist in the Local Universe. An innovative two-dimensional bulge/disk decomposition of the 2MASS/$K_{s}$-band images of the SFRS galaxies yields global luminosity and stellar mass functions, along with separate mass functions for their bulges and disks. These accurate mass functions cover the full range from dwarf galaxies to large spirals, and are representative of star-forming galaxies selected based on their infra-red luminosity, unbiased by AGN content and environment. We measure an integrated luminosity density $j$ = 1.72 $\pm$ 0.93 $\times$ 10$^{9}$ L$_{\odot}$ $h^{-1}$ Mpc$^{-3}$ and a total stellar mass density $ρ_{M}$ = 4.61 $\pm$ 2.40 $\times$ 10$^{8}$ M$_{\odot}$ $h^{-1}$ Mpc$^{-3}$. While the stellar mass of the \emph{average} star-forming galaxy is equally distributed between its sub-components, disks globally dominate the mass density budget by a ratio 4:1 with respect to bulges. In particular, our functions suggest that recent star formation happened primarily in massive systems, where they have yielded a disk stellar mass density larger than that of bulges by more than 1 dex. Our results constitute a reference benchmark for models addressing the assembly of stellar mass on the bulges and disks of local ($z = 0$) star-forming galaxies.
description: 33 pages, 21 figures, published in MNRAS, 504, 3831-3861 (2021)
Lemaitre-Tolman-Bondi collapse from the perspective of loop quantum gravity
Creators: name: Bojowald, Martin
name: Harada, Tomohiro
name: Tibrewala, Rakesh
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Lemaitre-Tolman-Bondi models as specific spherically symmetric solutions of general relativity simplify in their reduced form some of the mathematical ingredients of black hole or cosmological applications. The conditions imposed in addition to spherical symmetry turn out to take a simple form at the kinematical level of loop quantum gravity, which allows a discussion of their implications at the quantum level. Moreover, the spherically symmetric setting of inhomogeneity illustrates several non-trivial properties of lattice refinements of discrete quantum gravity. Nevertheless, the situation at the dynamical level is quite non-trivial and thus provides insights to the anomaly problem. At an effective level, consistent versions of the dynamics are presented which implement the conditions together with the dynamical constraints of gravity in an anomaly-free manner. These are then used for analytical as well as numerical investigations of the fate of classical singularities, including non-spacelike ones, as they generically develop in these models. None of the corrections used here resolve those singularities by regular effective geometries. However, there are numerical indications that the collapse ends in a tamer shell-crossing singularity prior to the formation of central singularities for mass functions giving a regular conserved mass density. Moreover, we find quantum gravitational obstructions to the existence of exactly homogeneous solutions within this class of models. This indicates that homogeneous models must be seen in a wider context of inhomogeneous solutions and their reduction in order to provide reliable dynamical conclusions.
description: 56 pages, 42 figures
The maximal superconductivity in proximity to charge density wave quantum critical point in Cu$_x$TiSe$_2$
Creators: name: Park, Tae-Ho
name: Uzoh, Obinna P.
name: Choi, Han-Yong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Superconductivity emerges in $1T$-TiSe$_2$ when its charge density wave (CDW) order is suppressed by Cu intercalation or pressure. Since the CDW state is thought to be an excitonic insulator, an interesting question is whether the superconductivity is also mediated by the excitonic fluctuations. We investigated this question as to the nature of doping induced superconductivity in Cu$_x$TiSe$_2$ by asking if it is consistent with the phonon-mediated pairing. We employed the {\it ab initio} density functional theory and density functional perturbation theory to compute the electron-phonon coupling Eliashberg function from which to calculate the superconducting (SC) critical temperature $T_c$. The calculated $T_c $ as a function of the doping concentration $x$ exhibits a dome shape with the maximum $T_c$ of $2-6$ K at $x \approx 0.05$ for the Coulomb pseudopotential $0 \leq μ^* \leq 0.1$. The maximal $T_c$ was found to be pinned to the quantum critical point at which the CDW is completely suppressed and the corresponding phonon mode becomes soft. Underlying physics is that the reduced phonon frequency enhances the electron-phonon coupling constant $λ$ which overcompensates the frequency decrease to produce a net increase of $T_c$. The doping induced superconductivity in Cu$_x$TiSe$_2$ seems to be consistent with the phonon-mediated pairing. Comparative discussion was made with the pressure induced superconductivity in TiSe$_2$.
description: 8 pages, 6 figures
Focus Group Discussion Script: The Principal Designer's duties and Project OSH
Creators: name: Ndekugri E. Issaka
name: Ankrah A. Nii
name: Adaku, Ebenezer
Publisher: name: Zenodo
Year: 2021
Subjects: Construction; Occupational Safety and Health; Risk Management; Health and Safety Coordination; Principal Designer

description: Occupational safety and health (OSH) still remains a challenge to the construction industry world-wide and source of worry for industry stakeholders. The Construction (Design and Management) Regulations (CDM) have been the primary tool to drive changes in the management of health and safety in the UK construction industry. Five (5) years after its latest Regulations (CDM 2015), there is a need for introspection, stock-taking and honest discussion on current practice and how to manage more collaboratively OSH risks on construction projects. This focus group discussion script aimed to capture industry feedback on experiences and views regarding the implementation of CDM 2015 at the pre-construction stage of construction projects with a focus on the role of the CDM Principal Designer.
title: Review: "Polish Risorgimento. Visions of the Modern Polish Nation and their Italian Foundations"/ Lidia Jurek. Frankfurt am Main: Peter Lang, 2012. ISBN 978-3-631-62401-2
Creators: name: Cybowski, Milosz K.
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: "Polish Risorgimento" by Lidia Jurek explores contacts and problems relating to Polish-Italian relations in the years 1848-1871. The book, based on the author's PhD thesis, is the first instalment of the "Eastern European Culture, Politics and Societies" series and it concentrates on three main problems: the presence of Italian models in the Polish search for reconstructing the Polish nation, the impact of successful Italian unification on Polish elites and their national identity-making and, finally, the relationship between nationalism and religion. These issues are discussed in three parts, each one dealing with "different national strategies which were drawn from the Italian example" (p. 45). Although Jurek's work is not the first dealing with this subject, it presents the most complex picture of these contacts.
Control of spray cooling in the continuous casting of steel
Creators: name: Baptista, Luis Antonio De Souza
Publisher: name: University of British Columbia
Year: 2010

description: The basic principles of spray control during casting speed changes in the continuous casting of steel have been studied. The normal spray control practice in which water flow in the sprays is made proportional to the casting speed has been found to be completely inadequate from the standpoint of controlling the surface temperature of the strand. A computer model based upon the principle of controlling the sprays as a function of the age of the metal passing through the machine has been developed. The model predicts both the average local residence time and water flux in a spray zone for any casting speed change. An accompanying heat flow model has also been developed for characterization of cooling rates and simulation of the effects of spray control practices on the surface temperature of the strand. The control model has been used for the development of a new spray control practice in an industrial slab caster. Tests have been performed both using the new practice and the normal spray control practice. Although, a complete verification has not been possible at this time, the model appears to realistically predict the thermal requirements of the strand during casting speed change. The necessity for automatic control of the sprays has become evident during the development of the present work. The principles of automatic control of the sprays have been studied and the control model adapted for this purpose. It has been shown that a true automatic control of spray cooling can be attained using the mathematical model for spray control.
title: Recenzja: "Gendering Family Policies in Post-Communist Europe - A Historical-Institutional Analysis"/ Steven Saxonberg. Hampshire: Palgrave Macmillan, 2014. ISBN 9780230299955
Creators: name: Pawlus, Małgorzata
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: Celem książki Stevena Saxonberga jest wielowymiarowa historyczno-instytucjonalna analiza porównawcza polityk rodzinnych w czterech postkomunistycznych krajach grupy wyszehradzkiej (Republika Czeska, Węgry, Polska i Słowacja). Autor wyjaśnia źródła różnic tych polityk, wskazuje odmienności sięgające korzeniami schyłku XIX wieku i utrzymujące się pomimo wspólnej socjalistycznej przeszłości, jak również odporne na zmiany systemowe po roku 1989. Co za tym idzie analiza obejmuje okres lat 1870-2007. Najważniejszym determinantem istniejącego zróżnicowania są odrębne i uwarunkowane historycznie ścieżki rozwoju instytucjonalnego (tzw. „zależność od ścieżki"; ang. path dependency). Praca niewątpliwie wpisuje się w dorobek tzw. szkoły historyczno-instytucjonalnej (Theda Skocpol, Paul Pierson, Grzegorz Ekiert, Kathleen Thelen, Tomasz Inglot). W szczególności, ze względu na zakres przedmiotowy oraz stawiane tezy, jest bliska analizie rozwoju welfare state w krajach postkomunistycznych przeprowadzonej przez Inglota [1]. Jednakże Saxonberg koncentruje się na wybranym aspekcie polityki społecznej – działaniach na rzecz rodziny w obszarze godzenia obowiązków zawodowych z rodzinnymi [2].
The Star Formation Reference Survey-V: the effect of extinction, stellar mass, metallicity, and nuclear activity on star-formation rates based on H$α$ emission
Creators: name: Kouroumpatzakis, Konstantinos
name: Zezas, Andreas
name: Maragkoudakis, Alexandros
name: Willner, Steven P.
name: Bonfini, Paolo
name: Ashby, Matthew L. N.
name: Sell, Paul H.
name: Jarrett, Thomas H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new H$α$ photometry for the Star-Formation Reference Survey (SFRS), a representative sample of star-forming galaxies in the local Universe. Combining these data with the panchromatic coverage of the SFRS, we provide calibrations of H$α$-based star-formation rates (SFRs) with and without correction for the contribution of [$\rm N_{^{II}}$] emission. We consider the effect of extinction corrections based on the Balmer decrement, infrared excess (IRX), and spectral energy distribution (SED) fits. We compare the SFR estimates derived from SED fits, polycyclic aromatic hydrocarbons, hybrid indicators such as 24 $μ$m + H$α$, 8 $μ$m + H$α$, FIR + FUV, and H$α$ emission for a sample of purely star-forming galaxies. We provide a new calibration for 1.4 GHz-based SFRs by comparing to the H$α$ emission, and we measure a dependence of the radio-to-H$α$ emission ratio based on galaxy stellar mass. Active galactic nuclei introduce biases in the calibrations of different SFR indicators but have only a minimal effect on the inferred SFR densities from galaxy surveys. Finally, we quantify the correlation between galaxy metallicity and extinction.
description: 20 pages, 21 Figures, accepted for publication in MNRAS
title: Review: "Poland and EU Enlargement. Foreign Policy in Transformation"/ Joanna Kaminska. New York: Palgrave Macmillan, 2014. ISBN 9781137452221
Creators: name: Tyushka, Andriy
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: Multilevel politics is as intriguing and attractive as complex for it involves a plentiful of actors that interact through multiple layers of sub-regional, national, and regional European structures both formalized and informal ones. The perplexing web of policymaking that characterizes the EU system of governance bears however pitfalls of responsibility escape, especially at the national level, since there is always a temptation to 'nationalize success' and 'Europeanize failures', as once put by former EU Commission President José Manuel Barroso. In the Polish context, this trivial situation has been particularly exemplary and traceable in the long-lasting public discourse best captured with a recognizable blaming formula 'winna Unia Europejska' or a rhetorical sighing after the single word 'Unia…'. Kaminska's timely book addresses this problem in Polish public discourse and actual European politics within the domain of European Union external relations. Although the title may not straight off reveal this, 'Poland and EU Enlargement: Foreign Policy in Transformation' by Joanna Kaminska is in fact a study of Europeanization of Polish foreign policy, and thus a valuable contribution to understanding domestic change and transformation with regard to foreign policy formulation in EU member states in the wake of a two-way 'Europeanization' process (comprising 'downloading' and 'uploading' activities).
Towards quantitative prediction of proteasomal digestion patterns of proteins
Creators: name: Goldobin, Denis S.
name: Zaikin, Alexey
Publisher: name: arXiv
Year: 2008
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We discuss the problem of proteasomal degradation of proteins. Though proteasomes are important for all aspects of the cellular metabolism, some details of the physical mechanism of the process remain unknown. We introduce a stochastic model of the proteasomal degradation of proteins, which accounts for the protein translocation and the topology of the positioning of cleavage centers of a proteasome from first principles. For this model we develop the mathematical description based on a master-equation and techniques for reconstruction of the cleavage specificity inherent to proteins and the proteasomal translocation rates, which are a property of the proteasome specie, from mass spectroscopy data on digestion patterns. With these properties determined, one can quantitatively predict digestion patterns for new experimental set-ups. Additionally we design an experimental set-up for a synthetic polypeptide with a periodic sequence of amino acids, which enables especially reliable determination of translocation rates.
description: 14 pages, 4 figures, submitted to J. Stat. Mech. (Special issue for proceedings of 5th Intl. Conf. on Unsolved Problems on Noise and Fluctuations in Physics, Biology & High Technology, Lyon (France), June 2-6, 2008)
Relativistic Shock Acceleration: A Hartree-Fock Approach
Creators: name: Dempsey, Paul
name: Kirk, John G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the problem of particle acceleration at a relativistic shocks assuming pitch-angle scattering and using a Hartree-Fock method to approximate the associated eigenfunctions. This leads to a simple transcendental equation determining the power-law index, $s$, given the up and downstream velocities. We compare our results with accurate numerical solutions obtained using the eigenfunction method. In addition to the power-law index this method yields the angular and spatial distributions upstream of the shock.
description: 4 pages, 2 figures, proceedings of the "4th Heidelberg International Symposium on High Energy Gamma-Ray Astronomy" July 7-11, 2008, Heidelberg, Germany
Benchmarking of 3D space charge codes using direct phase space measurements from photoemission high voltage DC gun
Creators: name: Bazarov, Ivan V.
name: Dunham, Bruce M.
name: Gulliford, Colwyn
name: Li, Yulin
name: Liu, Xianghong
name: Sinclair, Charles K.
name: Soong, Ken
name: Hannon, Fay
Publisher: name: arXiv
Year: 2008
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: We present a comparison between space charge calculations and direct measurements of the transverse phase space for space charge dominated electron bunches after a high voltage photoemission DC gun followed by an emittance compensation solenoid magnet. The measurements were performed using a double-slit setup for a set of parameters such as charge per bunch and the solenoid current. The data is compared with detailed simulations using 3D space charge codes GPT and Parmela3D with initial particle distributions created from the measured transverse and temporal laser profiles. Beam brightness as a function of beam fraction is calculated for the measured phase space maps and found to approach the theoretical maximum set by the thermal energy and accelerating field at the photocathode.
description: 11 pages, 23 figures. submitted to Phys Rev ST-AB
title: Review: "Shattered Spaces. Encountering Jewish Ruins in Postwar Germany and Poland"/ Michael Meng. Cambridge: Harvard University Press, 2011. ISBN 978-0674053038
Creators: name: Cybowski, Milosz K.
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: In "Shattered Spaces. Encountering Jewish Ruins in Postwar Germany and Poland" Michael Meng looks at two cases of remembering, preserving and reconstructing the Jewish past from 1945 to 2010. In his presentation of a "shifting history of Jewish sites" (p. 10), the author analyses five cities: Essen, Berlin (East and West), Potsdam, Wroclaw and Warsaw. While the Polish and German capitals were chosen as the largest Jewish cultural centres before the war, the three other cities "provide different glimpses into the postwar history of Jewish sites" (p. 10). Five chapters of the book present dichotomies and similarities between his case studies breaking with the common assumptions of the good West (preserving Jewish places) and bad East (destroying and erasing them). Though governed by different principles and ideas, Germany and Poland engaged in similar activities towards postwar Jewish ruins creating "a parallel history across a diverse region" (p. xii).
Focus Group Discussion Script: The Client and Project OSH
Creators: name: Ndekugri E. Issaka
name: Ankrah A. Nii
name: Adaku, Ebenezer
Publisher: name: Zenodo
Year: 2021
Subjects: Construction; Occupational Safety and Health; Risk Management; Health and Safety Coordination; Client

description: Occupational safety and health (OSH) still remains a challenge to the construction industry world-wide and source of worry for industry stakeholders. The Construction (Design and Management) Regulations (CDM) have been the primary tool to drive changes in the management of health and safety in the UK construction industry. Five (5) years after its latest Regulations (CDM 2015), there is a need for introspection, stock-taking and honest discussion on current practice and how to manage more collaboratively OSH risks on construction projects. This focus group discussion script aimed to capture industry feedback on experiences and views regarding the implementation of CDM 2015 at the pre-construction stage of construction projects with a focus on the role of the CDM Client.
title: Error in prediction due to data type availability in a coupled hydro-mechanical model
Creators: name: Aguinaga, José Guillermo De
Publisher: name: Bauhaus-Universität Weimar
Year: 2017
Subjects: subject: Sensitivitätsanalyse
subject: Damm
subject: Fehlerabschätzung
subject: 000
subject: 620

description: Different types of data provide different type of information. The present research analyzes the error on prediction obtained under different data type availability for calibration. The contribution of different measurement types to model calibration and prognosis are evaluated. A coupled 2D hydro-mechanical model of a water retaining dam is taken as an example. Here, the mean effective stress in the porous skeleton is reduced due to an increase in pore water pressure under drawdown conditions. Relevant model parameters are identified by scaled sensitivities. Then, Particle Swarm Optimization is applied to determine the optimal parameter values and finally, the error in prognosis is determined. We compare the predictions of the optimized models with results from a forward run of the reference model to obtain the actual prediction errors. The analyses presented here were performed calibrating the hydro-mechanical model to 31 data sets of 100 observations of varying data types. The prognosis results improve when using diversified information for calibration. However, when using several types of information, the number of observations has to be increased to be able to cover a representative part of the model domain. For an analysis with constant number of observations, a compromise between data type availability and domain coverage proves to be the best solution. Which type of calibration information contributes to the best prognoses could not be determined in advance. The error in model prognosis does not depend on the error in calibration, but on the parameter error, which unfortunately cannot be determined in inverse problems since we do not know its real value. The best prognoses were obtained independent of calibration fit. However, excellent calibration fits led to an increase in prognosis error variation. In the case of excellent fits; parameters' values came near the limits of reasonable physical values more often. To improve the prognoses reliability, the expected value of the parameters should be considered as prior information on the optimization algorithm.
The fate of pion condensation in quark matter: from the chiral limit to the physical pion mass
Creators: name: Abuki, H.
name: Anglani, R.
name: Gatto, R.
name: Pellicoro, M.
name: Ruggieri, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study aspects of the pion condensation in two-flavor neutral quark matter using the Nambu--Jona-Lasinio model of QCD at finite density. We investigate the role of electric charge neutrality, and explicit symmetry breaking via quark mass, both of which control the onset of the charged pion $(π^c)$ condensation. We show that the equality between the electric chemical potential and the in-medium pion mass, $μ_{e}=M_{π^-}$, as a threshold, persists even for a composite pion system in the medium, provided the transition to the pion condensed phase is of the second order. Moreover, we find that the pion condensate in neutral quark matter is extremely fragile to the symmetry breaking effect via a current quark mass $m$, and is ruled out for $m$ larger than the order of 10 keV.
description: 6 pages, 4 figures, RevTex4, (v2) title changed, Fig. 1 replaced, fourth section enlarged, references added, version accepted for publication in Phys. Rev. D, (v3) typos corrected, published version
Residual2Vec: Debiasing graph embedding with random graphs
Creators: name: Kojaku, Sadamori
name: Yoon, Jisung
name: Constantino, Isabel
name: Ahn, Yong-Yeol
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Graph embedding maps a graph into a convenient vector-space representation for graph analysis and machine learning applications. Many graph embedding methods hinge on a sampling of context nodes based on random walks. However, random walks can be a biased sampler due to the structural properties of graphs. Most notably, random walks are biased by the degree of each node, where a node is sampled proportionally to its degree. The implication of such biases has not been clear, particularly in the context of graph representation learning. Here, we investigate the impact of the random walks' bias on graph embedding and propose residual2vec, a general graph embedding method that can debias various structural biases in graphs by using random graphs. We demonstrate that this debiasing not only improves link prediction and clustering performance but also allows us to explicitly model salient structural properties in graph embedding.
description: 28 pages, 8 figures, 3 tables
Theoretical method for the generation of a dark two-mode squeezed state of a trapped ion
Creators: name: Werlang, T.
name: Villas-Boas, C. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Here we show how to generate a dark two-mode squeezed state of a trapped ion, employing a three-level ion in a V configuration with a strong decay of the excited states. The degree of squeezing can be manipulated by choosing the intensity of the driving fields. Our scheme is robust against the usual dissipation mechanism and could be implemented with present-day technology. The validity of the approximations employed in this work was tested by numerical calculations, which agreed completely with the analytical solutions.
Classification of OGLE eclipsing binary stars based on their morphology type with Locally Linear Embedding
Creators: name: Bódi, Attila
name: Hajdu, Tamás
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Optical Gravitational Lensing Experiment (OGLE) continuously monitors hundreds of thousands of eclipsing binaries in the field of galactic bulge and the Magellanic Clouds. These objects have been classified into main morphological sub-classes, such as contact, non-contact, ellipsoidal and cataclysmic variables, both by matching the light curves with predefined templates and visual inspections. Here we present the result of a machine learned automatic classification based on the morphology of light curves inspired by the classification of eclipsing binaries observed by the original Kepler mission. We similarly use a dimensionality reduction technique, the locally linear embedding to map the high dimension of the data set into a low dimensional embedding parameter space, while keeping the local geometry and the similarities of the neighbouring data points. After three consecutive steps, we assign one parameter to each binary star, which well scales with the "detachness", i.e. the sum of the relative radii of the components. This value is in good agreement with the morphology types listed in the OGLE catalog and, along with the orbital periods, can be used to filter any morphological sub-types based on the similarity of light curves. Our open-source pipeline can be applied in a fully automatic way to any other large data set to classify binary stars.
description: 11 pages, 8 figures, 1 table in machine-readable format, accepted for publication in ApJS, code available via https://github.com/astrobatty/polyfitter
On the `Stationary Implies Axisymmetric' Theorem for Extremal Black Holes in Higher Dimensions
Creators: name: Hollands, Stefan
name: Ishibashi, Akihiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: All known stationary black hole solutions in higher dimensions possess additional rotational symmetries in addition to the stationary Killing field. Also, for all known stationary solutions, the event horizon is a Killing horizon, and the surface gravity is constant. In the case of non-degenerate horizons (non-extremal black holes), a general theorem was previously established [gr-qc/0605106] proving that these statements are in fact generally true under the assumption that the spacetime is analytic, and that the metric satisfies Einstein's equation. Here, we extend the analysis to the case of degenerate (extremal) black holes. It is shown that the theorem still holds true if the vector of angular velocities of the horizon satisfies a certain "diophantine condition," which holds except for a set of measure zero.
description: 30pp, Latex, no figures
The rational dressing for abelian twisted loop Toda systems
Creators: name: Nirov, Kh. S.
name: Razumov, A. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We consider abelian twisted loop Toda equations associated with the complex general linear groups. The Dodd--Bullough--Mikhailov equation is a simplest particular case of the equations under consideration. We construct new soliton solutions of these Toda equations using the method of rational dressing.
description: LaTeX, 26 pages
Observable estimation of entanglement for arbitrary finite-dimensional mixed states
Creators: name: Zhang, Cheng-Jie
name: Gong, Yan-Xiao
name: Zhang, Yong-Sheng
name: Guo, Guang-Can
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present observable upper bounds of squared concurrence, which are the dual inequalities of the observable lower bounds introduced in [F. Mintert and A. Buchleitner, Phys. Rev. Lett. 98, 140505 (2007)] and [L. Aolita, A. Buchleitner and F. Mintert, Phys. Rev. A 78, 022308 (2008)]. These bounds can be used to estimate entanglement for arbitrary experimental unknown finite-dimensional states by few experimental measurements on a twofold copy $ρ\otimesρ$ of the mixed states. Furthermore, the degree of mixing for a mixed state and some properties of the linear entropy also have certain relations with its upper and lower bounds of squared concurrence.
description: 5 pages, 2 figures
The stochastic gravitational wave background from magnetars
Creators: name: Chowdhury, Sourav Roy
name: Khlopov, Maxim
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Magnetars have already been a potential candidate as gravitational wave sources that could be detected by current and future terrestrial as well as ground based gravitational wave detectors. In this article, we focus on the gravitational wave emission from the distorted rotating neutron stars. The deformation is assumed to be symmetric around an axis that is perpendicular to the rotation axis. The form is applied in the context of a neutron star whose magnetic field has been deformed on its own. By introducing the effects from all magnetars in the Universe, based on various proposed magnetic field configurations, such as poloidal, toroidal; stochastic gravitational wave background (SGWB) can be generated. We choose to figure out exactly how the observations of the stochastic gravitational-wave background should be used to understand much more about physics correlated with the magnetar behaviour, based on the restriction on the eccentricity of the magnetar.
Pade Unitarizations: A Critical Look
Creators: name: Virto, Javier
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use the Linear Sigma Model to test the convergence of different sequences of Pade Approximants when used to unitarize the low energy pi-pi scattering amplitude. We find that, in this particular case, diagonal sequences reproduce the sigma pole with high accuracy, as opposed to other sequences that have been discussed extensively.
description: 4 pages, 4 figures. To appear in the proceedings of QCD'08
Effect of the Dielectric-Constant Mismatch and Magnetic Field on the Binding Energy of Hydrogenic Impurities in a Spherical Quantum Dot
Creators: name: Manaselyan, Aram
name: Kirakosyan, Albert
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Within the effective mass approximation and variational method the effect of dielectric constant mismatch between the size-quantized semiconductor sphere, coating and surrounding environment on impurity binding energy in both the absence and presence of a magnetic field is considered. The dependences of the binding energy of a hydrogenic on-center impurity on the sphere and coating radii, alloy concentration, dielectric-constant mismatch, and magnetic field intensity are found for the GaAs-Ga_(1-x)Al_(x)As-AlAs (or vacuum) system.
Fast Excitation and Photon Emission of a Single-Atom-Cavity System
Creators: name: Bochmann, J.
name: Muecke, M.
name: Langfahl-Klabes, G.
name: Erbel, C.
name: Weber, B.
name: Specht, H. P.
name: Moehring, D. L.
name: Rempe, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on the fast excitation of a single atom coupled to an optical cavity using laser pulses that are much shorter than all other relevant processes. The cavity frequency constitutes a control parameter that allows the creation of single photons in a superposition of two tunable frequencies. Each photon emitted from the cavity thus exhibits a pronounced amplitude modulation determined by the oscillatory energy exchange between the atom and the cavity. Our technique constitutes a versatile tool for future quantum networking experiments.
description: 4 pages, 5 figures
Symmetries and exponential error reduction in Yang-Mills theories on the lattice
Creators: name: Della Morte, Michele
name: Giusti, Leonardo
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The partition function of a quantum field theory with an exact symmetry can be decomposed into a sum of functional integrals each giving the contribution from states with definite symmetry properties. The composition rules of the corresponding transfer matrix elements can be exploited to devise a multi-level Monte Carlo integration scheme for computing correlation functions whose numerical cost, at a fixed precision and at asymptotically large times, increases power-like with the time extent of the lattice. As a result the numerical effort is exponentially reduced with respect to the standard Monte Carlo procedure. We test this strategy in the SU(3) Yang--Mills theory by evaluating the relative contribution to the partition function of the parity odd states.
description: 18 pages, 4 figures. Few typos corrected, data sets added, Appendix A added. To appear on Comput. Phys. Commun
Slides for - A nationally-implemented AI solution for Covid-19
Creators: Mihaela van der Schaar
Publisher: name: IEEE
Year: 2020

Slides - IEEE ICME 2020, July 6-10, 2020, Mihaela van der Schaar, Slides
Why is AI/ML for healthcare is different? AI/ML has accomplished wonders ?. on well-posed problems where the notion of a ?solution? is well-defined and solutions are verifiable. Healthcare is different - problems are not well-posed and notion of a ?solution? is often not well-defined and solutions are hard to verify. This presents enormous challenges ?and also enormous opportunities.
Goal: Augment human decision making
- clinicians, medical researchers and policy makers
Modelling of SN2013dx associated with the low-redshift GRB130702A points to diversity in GRB/SN properties
Creators: name: Mazzali, P. A.
name: Pian, E.
name: Bufano, F.
name: Ashall, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The properties of the broad-lined type Ic supernova (SN) 2013dx, associated with the long gamma-ray burst GRB130702A at a redshift z = 0.145, are derived via spectral modelling. SN2013dx was similar in luminosity to other GRB/SNe, with a derived value of the mass of 56Nickel ejected in the explosion of ~0.4 Msun. However, its spectral properties suggest a smaller explosion kinetic energy. Radiation transport models were used to derive a plausible mass and density distribution of the SN ejecta in a one-dimensional approximation. While the mass ejected in the explosion that is obtained from the modelling (Mej ~ 9 Msun) is similar to that of all other well-studied GRB/SNe, the kinetic energy is significantly smaller (KE ~ 10^{52}erg). This leads to a smaller KE/Mej ratio, ~ 10^{51} erg/Msun, which is reflected in the narrower appearance of the spectral lines. While the low KE does not represent a problem for the scenario in which magnetar energy aids powering the explosion and the nucleosynthesis, it is nevertheless highly unusual. SNe Ic with similar KE have never been seen in coincidence with a GRB, and no well-observed GRB/SN has shown similarly low KE and KE/Mej.
description: 15 pages, 17 figures, in press in the MNRAS