cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On direct and inverse problems related to longitudinal impact of non-uniform elastic rods
Creators: name: Burgert, Jens
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2020
Subjects: Impact
Wave Propagation
Inverse Problem

description: Das Ziel der Arbeit ist die Entwicklung einer Methode zur Untersuchung inverser Probleme in aufeinandertreffenden Stäben. Dabei soll die Impedanz des auftreffenden Stabs ermittelt werden, sodass eine vorgegebene Stoßkraft erzeugt wird \mbox{(\textit{Impedanzproblem})}. Die Methode ist für viele experimentelle und praktische Anwendungen relevant. Beim Schlagbohrverfahren stellt sich beispielsweise die Frage, wie die Impedanz des auftreffenden Stabs gewählt werden kann, sodass die einlaufende Kraftwelle bezüglich der Effizienz optimiert wird. \\ Das \textit{Impedanzproblem} wird nur von wenigen Forschern behandelt. Der vielversprechendste Ansatz löst das inverse Problem mithilfe einer Integralgleichung. Dabei werden mehrere Näherungsmethoden angewandt, um die Impedanz des auftreffenden Stabs zu ermitteln. Im Rahmen dieser Arbeit wird eine Methode entwickelt, die auf der Idee differentieller Methoden basiert. Die Methode nutzt die Struktur des Wellenausbreitungsproblems aus. Hierfür werden die Stäbe durch Elemente mit stückweiser konstanter Impedanz diskretisiert. Zunächst wird die Impedanz des ersten Elements ermittelt, welches direkt auf die gestoßene Stange auftrifft. Alle weiteren Elemente beeinflussen die Stoßkraft zeitverzögert. Je weiter die Elemente von der Stoßfläche entfernt sind, desto später ist ihr Einfluss sichtbar. Zum Zeitpunkt des erstmaligen Einflusses des jeweiligen Elements wird die zugehörige Impedanz so gewählt, dass die vorgegebene Stoßkraft erreicht wird. Dadurch werden die diskretisierten Impedanzen des auftreffenden Stabs rekursiv bestimmt. \\ Für stückweise konstante Impedanzfunktionen liefert die entwickelte Methode exakte Lösungen in geschlossener Form. Des Weiteren wird eine Bedingung hergeleitet, die angibt, ob eine Lösung zu dem inversen Problem existiert. Es wird gezeigt, dass jedes zusätzliche Element, dessen Impedanz sich von der Impedanz des vorigen Elements unterscheidet, die Wahrscheinlichkeit der Existenz einer Lösung verringert. Das zugrundeliegende 1D-Modell wird experimentell validiert, indem die Simulationsergebnisse mit Messungen verglichen werden. Es wird insbesondere gezeigt, dass das Modell auch für komplexe Geometrievariationen der Stäbe gültig ist.
Experimental Challenges of the N* Program
Creators: name: Gothe, Ralf W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The first challenge faced in investigating the strong interaction from partially explored, where meson-cloud degrees of freedom dominate, to still unexplored distance scales, where the dressed-quark contributions are the dominating degrees of freedom, is to find an experiment that allows to measure observables that are probing this evolving nonperturbative QCD regime over the full range. Baryon spectroscopy can establish more sensitively, and in an almost model-independent way, nucleon excitation and non-resonant reaction amplitudes by complete measurements of pseudo-scalar meson photoproduction off nucleons. Elastic and transition form factors can then trace this evolution by measurements of elastic electron scattering and exclusive single-meson and double-pion electroproduction cross sections off the nucleon that will be extended to higher momentum transfers with the energy-upgraded CEBAF beam at JLab to study the dressed quark degrees of freedom, where their strong interaction is responsible for the ground and excited nucleon state formations. After establishing unprecedented high-precision data, the immanent next challenge is a high-quality analysis to extract these relevant electrocoupling parameters for various resonances that then can be compared to state of the art models and QCD-based calculations. Recent results demonstrate the status of the analysis and pinpoint further challenges, including those to establish QCD-based results directly from the experimental data.
description: 7 pages, 4 figures, NSTAR2011 conference
AMBER and CRIRES observations of the binary sgB[e] star HD 327083: evidence of a gaseous disc traced by CO bandhead emission
Creators: name: Wheelwright, H. E.
name: de Wit, W. J.
name: Weigelt, G.
name: Oudmaijer, R. D.
name: Ilee, J. D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: HD 327083 is a sgB[e] star that forms a binary system with an orbital semi-major axis of ~1.7 AU. Our previous observations using the VLTI and AMBER in the medium resolution K-band mode spatially resolved the environment of HD 327083. The continuum visibilities obtained indicate the presence of a circumbinary disc. CO bandhead emission was also observed. However, due to the limited spectral resolution of the previous observations, the kinematic structure of the emitting material was not constrained. In this paper, we address this and probe the source of the CO emission with high spectral resolution and spatial precision. We have observed HD 327083 with high spectral resolution (25 & 6 km/s) using AMBER and CRIRES. The observations are compared to kinematical models to constrain the source of the emission. It is shown that the CO bandhead emission can be reproduced using a model of a Keplerian disc with an inclination and size consistent with our previous VLTI observations. The model is compared to AMBER differential phase measurements, which have a precision as high as 30-micro-arcseconds. A differential phase signal corresponding to 0.15 milli-arcseconds (~5 sigma) is seen over the bandhead emission, which is in excellent agreement with the model that fits the CRIRES observations. In comparison, a model of an equatorial outflow, as envisaged in the standard sgB[e] scenario, does not reproduce the observations well. The excellent agreement between the disc model and observations in the spatial and spectral domains is compelling evidence that the CO bandhead emission of HD 327083 originates in a circumbinary Keplerian disc. In contrast, the model of an equatorial outflow cannot reproduce the observations well. This suggests that the standard sgB[e] scenario is not applicable to HD 327083, which supports the hypothesis that the B[e] behaviour of HD 327083 is due to binarity (ABRIDGED).
description: Accepted for publication in A&A
Classification of Stellar Spectra with LLE
Creators: name: Daniel, Scott F.
name: Connolly, Andrew J.
name: Schneider, Jeff
name: Vanderplas, Jake
name: Xiong, Liang
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the use of dimensionality reduction techniques for the classification of stellar spectra selected from the SDSS. Using local linear embedding (LLE), a technique that preserves the local (and possibly non-linear) structure within high dimensional data sets, we show that the majority of stellar spectra can be represented as a one dimensional sequence within a three dimensional space. The position along this sequence is highly correlated with spectral temperature. Deviations from this "stellar locus" are indicative of spectra with strong emission lines (including misclassified galaxies) or broad absorption lines (e.g. Carbon stars). Based on this analysis, we propose a hierarchical classification scheme using LLE that progressively identifies and classifies stellar spectra in a manner that requires no feature extraction and that can reproduce the classic MK classifications to an accuracy of one type.
description: 15 pages, 13 figures; accepted for publication in The Astronomical Journal
The Hi Environment of Counter-rotating Gas Hosts: Gas Accretion from Cold Gas Blobs
Creators: name: Chung, Aeree
name: Bureau, Martin
name: van Gorkom, J. H.
name: Koribalski, Baerbel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We probe the HI properties and the gas environments of three early-type barred galaxies harbouring counter-rotating ionized gas, NGC 128, NGC 3203 and NGC 7332. Each system has one or more optically-identified galaxy, at a similar or as yet unknown redshift within a 50 kpc projected radius. Using HI synthesis imaging data, we investigate the hypothesis that the counter-rotating gas in these galaxies has been accreted from their neighbours. In NGC 128 and NGC 3203, we find 9.6e7 and 2.3e8 Msun of HI, respectively, covering almost the entire stellar bodies of dwarf companions that appear physically connected. Both the HI morphology and kinematics are suggestive of tidal interactions. In NGC 7332, we do not find any directly-associated HI. Instead, NGC 7339, a neighbour of a comparable size at about 10 kpc, is found with 8.9e8 Msun of HI gas. More recently in a single dish observation, however, another group discovered a large HI structure which seems to be an extension of NGC 7339's HI disc and also covers NGC 7332. All these observations thus suggest that HI gas is being accreted in these three galaxies from their companions, which is likely responsible for the kinematically-decoupled gas component present in their central region. Considering the incompleteness of existing studies of the faint dwarf galaxy population both in the optical and in HI, accretion from cold gas blobs, presumably gas-rich dwarfs, is expected to occur even more frequently than what is inferred from such cases that have been observed to date.
description: 9 pages, 8 figures, accepted for publication in MNRAS; A paper with high resolution figures available at http://web.yonsei.ac.kr/achung/crd_vla.pdf
Experimental test of the time stability of the half-life of alpha-decay Po-214 nuclei
Creators: name: Alexeyev, E. N.
name: Gavriljuk, Ju. M.
name: Gangapshev, A. M.
name: Gezhaev, A. M.
name: Kazalov, V. V.
name: Kuzminov, V. V.
name: Panasenko, S. I.
name: Ratkevich, S. S.
name: Yakimenko, S. P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A method and results of an experimental test of the time stability of the half-life of alpha-decay Po-214 nuclei are presented. Two underground installations aimed at monitoring the time stability have been constructed. Time of measurement exceeds 1038 days for one set up and 562 days for the other. It was found that amplitude of possible annual variation of Po-214 half-life does not exceed 0.2% of the mean value. The limit on the deviation of the decay curve from exponent at 0.034\times T_{1/2}
description: Proceedings for XV-th International School "Particles and Cosmology" May 26 - June 2, 2011 Troitsk, Moscow Region, Russian Federation, 6 pages, 11 figure
On convergence of population processes in random environments to the stochastic heat equation with colored noise
Creators: name: Sturm, Anja K.
Publisher: name: Weierstrass Institute
Year: 2002
Subjects: subject: Heat equation
subject: colored noise
subject: stochastic partial differential equation
subject: superprocess
subject: weak convergence
subject: particle representation
subject: random environment
subject: existence theorem
subject: 60H15
subject: 60K35
subject: 60K37
subject: 60J80
subject: 60F05

description: We consider the stochastic heat equation with a multiplicative colored noise term on ℝ2 d ≥ 1 in dimensions greater or equal to one. First, we prove convergence of a branching particle system in a random environment, to the stochastic heat equation with a linear noise term. For this stochastic partial differential equation with more general non-Lipschitz noise coefficients we show convergence of associated lattice systems, which are infinite dimensional stochastic differential equations with correlated noise terms, provided that uniqueness of the limit is known. In the course of the proof, we establish existence and uniqueness of solutions to the lattice systems, as well as a new existence result for solutions to the stochastic heat equation. The latter are shown to be jointly continuous in time and space under some mild additional assumptions.
Atomistic simulations of heat transport in real-scale silicon nanowire devices
Creators: name: Duchemin, Ivan
name: Donadio, Davide
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Utilizing atomistic lattice dynamics and scattering theory, we study thermal transport in nanodevices made of 10 nm thick silicon nanowires, from 10 to 100 nm long, sandwiched between two bulk reservoirs. We find that thermal transport in devices differs significantly from that of suspended extended nanowires, due to phonon scattering at the contact interfaces. We show that thermal conductance and the phonon transport regime can be tuned from ballistic to diffusive by varying the surface roughness of the nanowires and their length. In devices containing short crystalline wires phonon tunneling occurs and enhances the conductance beyond that of single contacts.
description: 5 pages, 5 figures
QCD sum rules for the baryon octet in nuclear matter
Creators: name: Kryshen, E. L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The baryon self-energies are expressed in terms of the QCD condensates of the lowest dimension in symmetric and asymmetric nuclear matter within the QCD sum-rule approach. The self-energies are shown to satisfy the Gell-Mann--Okubo relations in the linear SU(3) breaking approximation. The results are in qualitative agreement with those obtained by the standard nuclear physics methods.
description: 27 pages, 4 figures
Metrological requirements for measurements of circadian radiation
Creators: name: Jakubowski, Piotr
name: Fryc, Irena
Publisher: name: The Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Poland
Year: 2018
Subjects: circadian radiation, optical measurement, LED lighting

description: OPTICA APPLICATA; 04/2018; ISSN 1429-7507
Application 2D Descriptors and Artificial Neural Networks for Beta-Glucosidase Inhibitors Screening
Creators: name: Przybyłek, Maciej
Publisher: name: figshare
Year: 2020
Subjects: subject: Cheminformatics
subject: Computational Chemistry
subject: 30499 Medicinal and Biomolecular Chemistry not elsewhere classified
subject: FOS: Chemical sciences
subject: Biochemistry
subject: 30402 Biomolecular Modelling and Design

description: Beta-glucosidase inhibitors play important medical and biological roles. In this study, simple two-variable artificial neural network (ANN) classification models were developed for beta-glucosidase inhibitors screening. All bioassay data were obtained from the ChEMBL database. The classifiers were generated using 2D molecular descriptors and the data miner tool available in the STATISTICA package (STATISTICA Automated Neural Networks, SANN). In order to evaluate the models’ accuracy and select the best classifiers among automatically generated SANNs, the Matthews correlation coefficient (MCC) was used. The application of the combination of maxHBint3 and SpMax8_Bhs descriptors leads to the highest predicting abilities of SANNs, as evidenced by the averaged test set prediction results (MCC = 0.748) calculated for ten different dataset splits. Additionally, the models were analyzed employing receiver operating characteristics (ROC) and cumulative gain charts. The thirteen final classifiers obtained as a result of the model development procedure were applied for a natural compounds collection available in the BIOFACQUIM database. As a result of this beta-glucosidase inhibitors screening, eight compounds were univocally classified as active by all SANNs.
POLITICAL INEQUALITY AND WOMEN PARTICIPATION IN PARLIAMENT IN SELECTED AFRICAN COUNTRIES
Creators: name: Iyeshim, Monday
Publisher: name: Zap journals
Year: 2023
Subjects: Inequality
Patriarchy
Parliament
Representation
Constitution

description: This research is linked to feminist legal theory which is based on the principle of equality and individualism. It's opposed to the patriarchal ideas that dominated Africa. Female political participation in Africa differs. While South Africa is 46.8%, Rwanda 61.3%, Uganda 34.4%, Egypt 27.4%, Kenya is 21.8% respectively. These instances of unequal participations in governance are pointer to the fact that there is political inequality in Africa generally. Despite its many gender equality policies, regional and international documents accepted as a requisite for achieving development. Therefore, the paper comparatively investigated the political inequality syndrome and women participation Uganda, South Africa, Egypt, Kenya and Rwanda as selected countries in Africa. The major objective is to unravel the ratio of political participation between men and women. Comparative research methodology was generated to secure secondary data through qualitative and quantitative approaches using single percentages in analysis. It finds out that quota system and or the entrenchment of affirmative action, seat reservation etc are necessary for the achievement of maximum female representations in Africa.
Этноэкологические  исследования  культуры  и  концепция  культурного ландшафта
Creators: name: Ямсков А.Н.
Publisher: name: Zenodo
Year: 2003
Subjects: культурный ландшафт, культурная география, этноэкология, этническая экология, культурология, хозяйственно-культурный тип, историко-культурная область

description: Статья содержит обзор различных аспектов этноэкологического подхода к исследованиям культуры, включая «этный» (etic) и «эмный» (emic), анализ возможных связей понятия «культурный ландшафт» с этнологическими концепциями хозяйственно-культурных типов (ХКТ) и историко-культурных областей (ИКО) и этноэкологическим концептом этноэкосистемы.
Multi-Epoch Observations of HD69830: High Resolution Spectroscopy and Limits to Variability
Creators: name: Beichman, C. A.
name: Lisse, C. M.
name: Tanner, A. M.
name: Bryden, G.
name: Akeson, R. L.
name: Ciardi, D. R.
name: Boden, A. F.
name: Dodson-Robinson, S. E.
name: Salyk, C.
name: Wyatt, M. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The main-sequence solar-type star HD69830 has an unusually large amount of dusty debris orbiting close to three planets found via the radial velocity technique. In order to explore the dynamical interaction between the dust and planets, we have performed multi-epoch photometry and spectroscopy of the system over several orbits of the outer dust. We find no evidence for changes in either the dust amount or its composition, with upper limits of 5-7% (1 $σ$ per spectral element) on the variability of the {\it dust spectrum} over 1 year, 3.3% (1 $σ$) on the broad-band disk emission over 4 years, and 33% (1 $σ$) on the broad-band disk emission over 24 years. Detailed modeling of the spectrum of the emitting dust indicates that the dust is located outside of the orbits of the three planets and has a composition similar to main-belt, C-type asteroids asteroids in our solar system. Additionally, we find no evidence for a wide variety of gas species associated with the dust. Our new higher SNR spectra do not confirm our previously claimed detection of H$_2$O ice leading to a firm conclusion that the debris can be associated with the break-up of one or more C-type asteroids formed in the dry, inner regions of the protoplanetary disk of the HD69830 system. The modeling of the spectral energy distribution and high spatial resolution observations in the mid-infrared are consistent with a $\sim$ 1 AU location for the emitting material.
MAGIC observations of the giant radio galaxy M87 in a low emission state between 2005 and 2007
Creators: name: Berger, Karsten
name: Prester, Dijana Dominis
name: Tavecchio, Fabrizio
name: Terzić, Tomislav
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the results of a long M87 monitoring campaign in very high energy $γ$-rays with the MAGIC-I Cherenkov telescope. A total of 150 hours of data was gathered between 2005 and 2007. No flaring activity was found during that time. Nevertheless, we have found an apparently steady and weak signal at the level of $7σ$. We present the spectrum between 100 GeV and 2 TeV, which is consistent with a simple power law with a spectral index $-2.21\pm0.21$ and a flux normalization (at 300 GeV) of $5.4\pm1.1 \times 10^{-8} \frac{1}{\mathrm{TeV s m}^{2}}$. It complements well with the previously published Fermi spectrum, covering an energy range of four orders of magnitude without apparent change in the spectral index.
description: 4 pages, 2 tables, 4 figures, proceeding of the 32nd International Conference on Cosmic Rays (ICRC), Beijing, August 11-18, 2011
Homoclinic Orbits of the FitzHugh-Nagumo Equation: The Singular-Limit
Creators: name: Guckenheimer, John
name: Kuehn, Christian
Publisher: name: arXiv
Year: 2012
Subjects: subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The FitzHugh-Nagumo equation has been investigated with a wide array of different methods in the last three decades. Recently a version of the equations with an applied current was analyzed by Champneys, Kirk, Knobloch, Oldeman and Sneyd using numerical continuation methods. They obtained a complicated bifurcation diagram in parameter space featuring a C-shaped curve of homoclinic bifurcations and a U-shaped curve of Hopf bifurcations. We use techniques from multiple time-scale dynamics to understand the structures of this bifurcation diagram based on geometric singular perturbation analysis of the FitzHugh-Nagumo equation. Numerical and analytical techniques show that if the ratio of the time-scales in the FitzHugh-Nagumo equation tends to zero, then our singular limit analysis correctly represents the observed CU-structure. Geometric insight from the analysis can even be used to compute bifurcation curves which are inaccessible via continuation methods. The results of our analysis are summarized in a singular bifurcation diagram.
description: preprint version - for final version see journal reference
Winding Number in String Field Theory
Creators: name: Hata, Hiroyuki
name: Kojita, Toshiko
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Motivated by the similarity between cubic string field theory (CSFT) and the Chern-Simons theory in three dimensions, we study the possibility of interpreting N=(π^2/3)\int(U Q_B U^{-1})^3 as a kind of winding number in CSFT taking quantized values. In particular, we focus on the expression of N as the integration of a BRST-exact quantity, N=\int Q_B A, which vanishes identically in naive treatments. For realizing non-trivial N, we need a regularization for divergences from the zero eigenvalue of the operator K in the KBc algebra. This regularization must at same time violate the BRST-exactness of the integrand of N. By adopting the regularization of shifting K by a positive infinitesimal, we obtain the desired value N[(U_tv)^{\pm 1}]=\mp 1 for U_tv corresponding to the tachyon vacuum. However, we find that N[(U_tv)^{\pm 2}] differs from \mp 2, the value expected from the additive law of N. This result may be understood from the fact that Ψ=U Q_B U^{-1} with U=(U_tv)^{\pm 2} does not satisfy the CSFT EOM in the strong sense and hence is not truly a pure-gauge in our regularization.
description: 20 pages, no figures; v2: references added, minor changes
Inelastic Mg+H collision data for non-LTE applications in stellar atmospheres
Creators: name: Barklem, P. S.
name: Belyaev, A. K.
name: Spielfiedel, A.
name: Guitou, M.
name: Feautrier, N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Rate coefficients for inelastic Mg+H collisions are calculated for all transitions between the lowest seven levels and the ionic state (charge transfer). The rate coefficients are based on cross-sections from full quantum scattering calculations, which are themselves based on detailed quantum chemical calculations for the MgH molecule. The data are needed for non-LTE applications in cool astrophysical environments, especially cool stellar atmospheres, and are presented for a temperature range of 500-8000 K. From consideration of the sensitivity of the cross-sections to various uncertainties in the calculations, most importantly input quantum chemical data and the numerical accuracy of the scattering calculations, a measure of the possible uncertainties in the rate coefficients is estimated.
description: Accepted by A&A. 5 pages, 1 figure
Ionised gas abundances in barred spiral galaxies
Creators: name: Florido, E.
name: Pérez, I.
name: Zurita, A.
name: Sánchez-Blázquez, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: This is the third paper of a series devoted to study the properties of bars from long slit spectroscopy to understand their formation, evolution and their influence on the evolution of disk galaxies. In this work we aim to determine the gas metallicity distribution of a sample of 20 barred early-type galaxies. We compare the nebular and stellar metallicity distributions to conclude about the origin of the warm gas. We compare the results of nebular emission metallicities using different semi-empirical methods. We carry out AGN diagnostic diagrams along the radius to determine the radius of influence of the AGN and the nuclei nature of the studied galaxies. We then derive the gas metallicities along the bars and compare the results to the distribution of stellar metallicities in the same regions. Most of the gas emission is centrally concentrated, although 15 galaxies also show emission along the bar. In the central regions, gas oxygen abundances are in the range 12+$\log$(O/H)= 8.4-9.1. The nebular metallicity gradients are very shallow in the bulge and bar regions. For three galaxies (one of them a LINER), the gas metallicities lie well below the stellar ones in the bulge region. These results do not depend on the choice of the semi-empirical calibration used to calculate the abundances. We see that the galaxies with the lowest abundances are those with the largest rotational velocities. The presence of gas of significantly lower metallicity than the stellar abundances in three of our galaxies, points to an external origin as the source of the gas that fuels the present star formation in the centre of some early-type barred galaxies. The fact that the bar/disk nebular metallicities are higher than the central ones might be indicating that the gas could be accreted via cooling flows instead of radial accretion from gas sitting in the outer parts of the disk.
description: 20 pages, 15 figures, accepted for publication in Astronomy and Astrophysics
Towards the Dark Side of Political Skill: Development and Validation of the Dark Political Skill Scale
Creators: name: Wiltshire, Jocelyn
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Psychology
subject: FOS: Psychology
subject: Psychology--Industrial
subject: Psychology--Personality
subject: Psychology
subject: Organizational Politics
subject: Political Skill
subject: Personality
subject: Workplace Behaviours

description: In the present research, I develop and validate the Dark Political Skill Scale. Intended to supplement the existing Political Skill Inventory (PSI; Ferris et al., 2005), the Dark Political Skill Scale captures the more covert and deceptive side of political effectiveness in the workplace. Across three studies, I collected data from independent samples of full-time employees (N = 430, N = 157, and N = 142), representing a variety of occupational backgrounds. The 10-item uni-dimensional Dark Political Skill Scale demonstrated consistent evidence of convergent validity. As expected, it was positively related to (though not redundant with) an array of social competencies (political skill, social skill, self-monitoring, and perceived ability to deceive) and political will. I also found evidence of criterion-related validity as the Dark Political Skill Scale was associated with behavioural outcomes, including greater engagement in counterproductive work behaviour and workplace impression management. Dark political skill also acted as an influential moderator in predicting impression management. Importantly, in comparison to the PSI, the Dark Political Skill Scale demonstrated differential relationships with the variables in the present research. Of note, the personality profiles of employees scoring high on dark political skill showed a different pattern of results than the PSI, such that the former were lower in Honesty-Humility, Emotionality, and Agreeableness. Finally, self- and peer-reports indicated low to moderate convergence for the Dark Political Skill Scale, which was interpreted to be suggestive of the deceptive nature of dark political skill. Taken together, the Dark Political Skill Scale offers a novel theoretical and methodological contribution to the organizational politics literature. Supplementing the PSI, this new scale provides the opportunity for a more comprehensive assessment of workplace political effectiveness, and a greater understanding of the competencies required for successful engagement in a full range of political behaviours.
Funding tool integration (COESO D4.2)
Creators: name: De Santis, Luca
name: Lombardo, Tiziana
name: Tankova, Alexandra
Publisher: name: Zenodo
Year: 2023
Subjects: Citizen Science
Participatory Research
Platform
COESO Project

description: The aim of this document is to complement the release of the actual COESO project Deliverable 4.2 - Funding tool integration, due in M25 (31st January 2023). This deliverable describes the context and methodology of the Funding tool integration into VERA to allow its users to search for existing funding schemes and calls for Citizen Science projects in SSH.
Comparison of Pressure Profiles of Massive Relaxed Galaxy Clusters using Sunyaev-Zel'dovich and X-ray Data
Creators: name: Bonamente, Massimiliano
name: Hasler, Nicole
name: Bulbul, Esra
name: Carlstrom, John E.
name: Culverhouse, Thomas L.
name: Gralla, Megan
name: Greer, Christopher
name: Hawkins, David
name: Hennessy, Ryan
name: Joy, Marshall
name: Kolodziejczak, Jeffery
name: Lamb, James W.
name: Landry, David
name: Leitch, Erik M.
name: Marrone, Daniel P.
name: Miller, Amber
name: Mroczkowski, Tony
name: Muchovej, Stephen
name: Plagge, Thomas
name: Pryke, Clem
name: Sharp, Matthew
name: Woody, David
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present Sunyaev-Zel'dovich (SZ) effect observations of a sample of 25 massive relaxed galaxy clusters observed with the Sunyaev-Zel'dovich Array (SZA), an 8-element interferometer that is part of the Combined Array for Research in Millimeter-wave Astronomy (CARMA). We perform an analysis of new SZA data and archival Chandra observations of this sample to investigate the integrated pressure -- a proxy for cluster mass -- determined from X-ray and SZ observations, two independent probes of the intra-cluster medium. This analysis makes use of a model for the intra-cluster medium introduced by Bulbul (2010) which can be applied simultaneously to SZ and X-ray data. With this model, we estimate the pressure profile for each cluster using a joint analysis of the SZ and X-ray data, and using the SZ data alone. We find that the integrated pressures measured from X-ray and SZ data are consistent. This conclusion is in agreement with recent results obtained using WMAP and Planck data, confirming that SZ and X-ray observations of massive clusters detect the same amount of thermal pressure from the intra-cluster medium. To test for possible biases introduced by our choice of model, we also fit the SZ data using the universal pressure profile proposed by Arnaud (2010), and find consistency between the two models out to r500 in the pressure profiles and integrated pressures.
description: Accepted for New Journal of Physics, Focus Issue on Galaxy Clusters
Recent Progress of RF Cavity Study at Mucool Test Area
Creators: name: Yonehara, Katsuya
Publisher: name: arXiv
Year: 2012
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: In order to develop an RF cavity that is applicable for a muon beam cooling channel, a new facility, called Mucool Test Area (MTA) has been built at Fermilab. MTA is a unique facility whose purpose is to test RF cavities in various conditions. There are 201 and 805 MHz high power sources, a 4-Tesla solenoid magnet, a cryogenic system including a Helium liquifier, an explosion proof apparatus to operate gaseous/liquid Hydrogen, and a beam transport line to send an intense H- beam from the Fermilab Linac accelerator to the MTA hall. Recent activities at MTA will be discussed in this document.
description: 4 pp. 13th International Workshop on Neutrino Factories, Superbeams and Beta beams (NuFact11) 1-6 Aug 2011: Geneva, Switzerland
Pore Morphological Multi-Phase Digital Rock Physics Models
Creators: name: Mohammadmoradi, Seyed Peyman
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Engineering--Petroleum
subject: Pore-level
subject: Capillary Dominant
subject: Immiscible Displacements
subject: Saturation functions
subject: Pore Morphology

description: To reduce expenses, failures, ecological footprints, and uncertainty of reservoir appraisal operations, digital rock physics workflows need to be evolved constantly. The traditional characterization procedures are being replaced by technology-rich environmentally sustainable virtual packages. The advancing high-resolution imaging technology offers the opportunity to directly capture exhaustive pore-level images and highlights the need for fast, reliable and multi-phase simulation techniques. Performing direct multi-phase simulations and tracking fluid-fluid and fluid-solid interfaces are the most essential and challenging parts of pore-level studies. There is a technical dilemma in the direct simulation of immiscible displacements between dynamic, e.g. CFD and Lattice-Boltzmann, and quasi-static, e.g. pore morphological, approaches. Once the partially saturated micro-scale realizations are generated, the effective mechanical, petrophysical and thermo-physical properties can be predicted applying steady-state simulations through solid fabrics and fluids spatial arrangements. In this thesis, direct voxel-based pore-level fluid flow models are proposed, validated and applied to real and synthetic porous media images. Two- and three-phase quasi-static pore morphological algorithms are first presented to simulate immiscible displacement processes and post-processing results are compared with experimental data available in the literature. The workflows are applied to predict thermo-physical and petrophysical characteristics of porous media from the pore-scale point of view. The filling process is adapted applying an object-based technique and the marching cubes algorithm is utilized to extract spreading and wetting films. To deal with the multi-scale nature of porous media and extent the capability and universality of the approach, a hybrid approach called DyMAS (Dynamic Morphology Assisted Simulation) is then proposed coupling pore morphological and CFD-based dynamic workflows.
Density Fluctuation Spectrum of Solar Wind Turbulence between Ion and Electron Scales
Creators: name: Chen, C. H. K.
name: Salem, C. S.
name: Bonnell, J. W.
name: Mozer, F. S.
name: Bale, S. D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Space Physics (physics.space-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We present a measurement of the spectral index of density fluctuations between ion and electron scales in solar wind turbulence using the EFI instrument on the ARTEMIS spacecraft. The mean spectral index at 1 AU was found to be -2.75 +/- 0.06, steeper than predictions for pure whistler or kinetic Alfven wave turbulence, but consistent with previous magnetic field measurements. The steep spectra are also consistent with expectations of increased intermittency or damping of some of the turbulent energy over this range of scales. Neither the spectral index nor the flattening of the density spectra before ion scales were found to depend on the proximity to the pressure anisotropy instability thresholds, suggesting that they are features inherent to the turbulent cascade.
Modeling and Mitigation of Nonlinear Distortions by using Neural Networks for LTE-A Wireless Transmitters
Creators: name: Wang, Dongming
Publisher: name: Graduate Studies
Year: 2016
Subjects: subject: Engineering
subject: Engineering--Electronics and Electrical
subject: power amplifier, modern communication systems, neural networks, digital predistortion

description: A two-box DPD system based on the cascade of a memory predistortion model and a memoryless predistortion model is proposed. The memory predistortion model is designed by using an ARVTDNN, while the memoryless predistortion model is designed by using a memoryless ARVTDNN. Considering the signal at the output of the PA linearized by the proposed two-box DPD system, one will notice that its ACPR is demonstrated by measurement results to have a better performance by 3-5 dB than that of an existing two-box polynomial-based DPD system. Most importantly, the two-box polynomial-based DPD system does not meet the spectrum emission mask of -45 dBc. In addition, the proposed two-box ARVTDNN-based DPD system meets the ACPR requirements for the observation bandwidth of as low as 155 MHz.
Optimal Squeezing in Resonance Fluorescence via Atomic-State Purification
Creators: name: Grünwald, P.
name: Vogel, W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Squeezing of atomic resonance fluorescence is shown to be optimized by a properly designed environment, which can be realized by a quasi-resonant cavity. Optimal squeezing is achieved if the atomic coherence is maximized, corresponding to a pure atomic quantum state. The atomic-state purification is achieved by the backaction of the cavity field on the atom, which increases the atomic coherence and decreases the atomic excitation. For realistic cavities, the coupling of the atom to the cavity field yields a purity of the atomic state of more than 99%. The fragility of squeezing against dephasing is substantially reduced in this scenario, which may be important for various applications.
description: 6 pages including supplemental information, 3 figures. Accepted for PRL
Neutrino-production of single pions: dipole description
Creators: name: Kopeliovich, B. Z.
name: Schmidt, Ivan
name: Siddikov, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The light-cone distribution amplitudes for the axial current are derived within the instanton vacuum model (IVM), which incorporates nonperturbative effects including spontaneous chiral symmetry breaking. This allows to extend applicability of the dipole approach, usually used in the perturbative domain, down to $Q^{2}\to0$, where partially conserved axial current (PCAC) imposes a relation between the neutrino-production cross section and the one induced by pions. A dramatic breakdown of the Adler relation (AR) for diffractive neutrino-production of pions, caused by absorptive corrections, was revealed recently in arXiv:1105.1711. Indeed, comparing with the cross section predicted by the dipole phenomenology at $Q^{2}\to0$ on a proton target we confirmed the sizable deviation from the value given by the AR, as was estimated in arXiv:1105.1711 within a simplified two-channel model. The dipole approach also confirms that in the black-disc limit, where the absorptive corrections maximize, the diffractive cross section ceases, on the contrary to the expectation based on PCAC.
description: 17 pages, 9 figures
Non-Integrability of the Sasano System of Type $D_5^{(1)}$ and Stokes Phenomena
Creators: name: Stoyanova, Tsvetana
Publisher: name: arXiv
Year: 2023
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 34M55, 37J30, 24M40

description: In 2006, Y. Sasano proposed higher-order Painlevé systems, which admit affine Weyl group symmetry of type $D^{(1)}_l$, $l=4, 5, 6, \dots$. In this paper, we study the integrability of a four-dimensional Painlevé system, which has symmetry under the extended affine Weyl group $\widetilde{W}\bigl(D^{(1)}_5\bigr)$ and which we call the Sasano system of type $D^{(1)}_5$. We prove that one family of the Sasano system of type $D^{(1)}_5$ is not integrable by rational first integrals. We describe Stokes phenomena relative to a subsystem of the second normal variational equations. This approach allows us to compute in an explicit way the corresponding differential Galois group and therefore to determine whether the connected component of its unit element is not Abelian. Applying the Morales-Ramis-Simó theory, we establish a non-integrable result.
Functional Genomics and Metabolite Profiling as Tools for Alkaloid Biosynthetic Gene Discovery
Creators: name: Dinsmore, Donald Reed
Publisher: name: Graduate Studies
Year: 2015
Subjects: subject: Bioinformatics
subject: FOS: Computer and information sciences
subject: Botany
subject: Genetics
subject: FOS: Biological sciences
subject: Microbiology
subject: Biology--Molecular
subject: Plant Physiology
subject: Chemistry--Analytical
subject: Biochemistry
subject: Plants
subject: Metabolism
subject: Mass spectrometry
subject: Enzyme
subject: Opium poppy

description: The benzylisoquinoline alkaloids (BIAs) are diverse group of plant specialized metabolites found in the families Papaveracea, Ranunculaceae, Berberidaceae and Menispermaceae. Plants remain the only commercial source for BIAs and their biosynthesis is poorly understood. O-methyltransferases (OMTs) are wide spread in BIA biosynthesis. Putative OMTs were found in stem and root Next-Generation Sequencing transcriptomic databases. Putative OMT cDNAs were isolated from Papaver somniferum and commercially synthesized. Recombinant protoberberine 2-O-methyltransferase (2OMT) was heterologously expressed in Escherichia coli and assayed. 2OMT demonstrated the 2-O-methylation of protoberberine alkaloids and the 7-O-methylation of simple BIAs. The substrate range and tissue specific expression of 2OMT suggest its in vivo role is converting (S)-cheilanthifoline to (S)-sinactine. A LC-MS based targeted alkaloid profiling of twenty BIA producing species from the families Papaveracea, Ranunculaceae, Berberidaceae and Menispermaceae was conducted.
Background due to stored electrons following nuclear decays in the KATRIN spectrometers and its impact on the neutrino mass sensitivity
Creators: name: Mertens, S.
name: Drexlin, G.
name: Fraenkle, F. M.
name: Furse, D.
name: Glueck, F.
name: Goerhardt, S.
name: Hoetzel, M.
name: Kaefer, W.
name: Leiber, B.
name: Thuemmler, T.
name: Wandkowsky, N.
name: Wolf, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The KATRIN experiment is designed to measure the absolute neutrino mass scale with a sensitivity of 200 meV at 90% C.L. by high resolution tritium beta-spectroscopy. A low background level of 10 mHz at the beta-decay endpoint is required in order to achieve the design sensitivity. In this paper we discuss a novel background source arising from magnetically trapped keV electrons in electrostatic retarding spectrometers. The main sources of these electrons are alpha-decays of the radon isotopes (219,220)Rn as well as beta-decays of tritium in the volume of the spectrometers. We characterize the expected background signal by extensive MC simulations and investigate the impact on the KATRIN neutrino mass sensitivity. From these results we refine design parameters for the spectrometer vacuum system and propose active background reduction methods to meet the stringent design limits for the overall background rate.
Curvaton reheating and intermediate inflation in brane cosmology
Creators: name: Farajollahi, H.
name: Ravanpak, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In this paper, we study the curvaton reheating mechanism for an intermediate inflationary universe in brane world cosmology. In contrast to our previous work, we assume that when the universe enters the kination era, it is still in the high-energy regime. We then discuss, in detail, the new cosmological constraints on both the model parameters and the physical quantities.
description: 15 pages, 4 figures. With some modifications to the text the version published on Can. J. Phys. arXiv admin note: significant text overlap with arXiv:1011.0801
Grassmann Variables and the Jaynes-Cummings Model
Creators: name: Dalton, Bryan J.
name: Garraway, Barry M.
name: Jeffers, John
name: Barnett, Stephen M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: This paper shows that phase space methods using a positive P type distribution function involving both c-number variables (for the cavity mode) and Grassmann variables (for the two level atom) can be used to treat the Jaynes-Cummings model. Although it is a Grassmann function, the distribution function is equivalent to six c-number functions of the two bosonic variables. Experimental quantities are given as bosonic phase space integrals involving the six functions. A Fokker-Planck equation involving both left and right Grassmann differentiation can be obtained for the distribution function, and is equivalent to six coupled equations for the six c-number functions. The approach used involves choosing the canonical form of the (non-unique) positive P distribution function, where the correspondence rules for bosonic operators are non-standard and hence the Fokker-Planck equation is also unusual. Initial conditions, such as for initially uncorrelated states, are used to determine the initial distribution function. Transformations to new bosonic variables rotating at the cavity frequency enables the six coupled equations for the new c-number functions (also equivalent to the canonical Grassmann distribution function) to be solved analytically, based on an ansatz from a 1980 paper by Stenholm. It is then shown that the distribution function is the same as that determined from the well-known solution based on coupled equations for state vector amplitudes of atomic and n-photon product states. The treatment of the simple two fermion mode Jaynes-Cummings model is a useful test case for the future development of phase space Grassmann distribution functional methods for multi-mode fermionic applications in quantum-atom optics.
description: 57 pages, 0 figures. Version 1