cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A semiquantitative approach to the impurity-band-related transport properties of GaMnAs nanolayers
Creators: name: de Oliveira, E. J. R.
name: Cabral, E. Dias
name: Boselli, M. A.
name: Lima, I. C. da Cunha
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate the spin-polarized transport of GaMnAs nanolayers in which a ferromagnetic order exists below a certain transition temperature. Our calculation for the self-averaged resistivity takes into account the existence of an impurity band determining the extended ("metallic" transport) or localized (hopping by thermal excitation) nature of the states at and near the Fermi level. Magnetic order and resistivity are inter-related due to the influence of the spin polarization of the impurity band and the effect of the Zeeman splitting on the mobility edge. We obtain, for a given range of Mn concentration and carrier density, a "metallic" behavior in which the transport by extended carriers dominates at low temperature, and is dominated by the thermally excited localized carriers near and above the transition temperature. This gives rise to a conspicuous hump of the resistivity which has been experimentally observed and brings light onto the relationship between transport and magnetic properties of this material.
Lessons learned from the ITRF2020 processing
Creators: name: Moreaux Guilhem
Publisher: name: Zenodo
Year: 2022
Subjects: DORIS, ITRF, Reference Frame

description: That presentation summarizes the main evolutions of the DORIS contribution between ITRF2014 and ITRF2020 and shows the performance of the DORIS solution released for the 2020 realization of the International Terrestrial Reference Frame.
One-step solid-state thermolysis of a metal–organic framework: a simple and facile route to large-scale of multiwalled carbon nanotubes
Creators: name: Chen, Linyun
name: Bai, Junfeng
name: Wang, Chunzhao
name: Pan, Yi
name: Scheer, Manfred
name: You, Xiaozeng
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 540 Chemie

description: We report a simple and facile solid-state approach to large-scale synthesis of multiwalled carbon nanotubes (MCNTs), for the first time, by one-step direct thermolysis of a metal–organic framework [Ni3(btc)2·12H2O] (btc = benzene-1,3,5-tricarboxylato) in a one-end closed conventional horizontal tube furnace under relatively low temperature without using any additional carrier gas or catalyst.
Direct experimental measurement of the speed-stress relation for dislocations in a plasma crystal
Creators: name: Nosenko, V.
name: Morfill, G. E.
name: Rosakis, P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The speed-stress relation for gliding edge dislocations was experimentally measured for the first time. The experimental system used, a two-dimensional plasma crystal, allowed observation of individual dislocations at the "atomistic" level and in real time. At low applied stress dislocations moved subsonically, at higher stress their speed abruptly increased to 1.9 times the speed of shear waves, then slowly grew with stress. There is evidence that immediately after nucleation dislocations can move faster than pressure waves.
description: 5 pages, 4 figures
Dimolybdenum Bis-2,4,6-triisopropyl-benzoate Bis-4-isonicotinate: A Redox Active Analogue of 4,4′-Bipyridine with Ambivalent Properties
Creators: name: Chisholm, Malcolm H.
name: Dann, Angela S.
name: Dielmann, Fabian
name: Gallucci, Judith C.
name: Wolmershäuser, Gotthelf
name: Patmore, Nathan J.
name: Ramnauth, Ramkrishna
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 540 Chemie

description: The reaction between Mo2(TiPB)4 and 4-iso-nicotinic acid (2 equiv) in ethanol leads to the formation of trans-Mo2(TiPB)2(nic)2, I, where TiPB = 2,4,6-triisopropylbenzoate and nic = 4-isonicotinate. The molecular structures of I and I·2DMSO were determined in the solid state by a single-crystal X-ray study, and its electronic structure was determined by DFT calculations on a model compound, where formate ligands were substituted for the bulky TiPB. The physicochemical properties of I are reported, and its potential as a redox active building block, a quasi-metalloorganic analogue of 4,4′-bipyridine, is described in the synthesis of molecular and solid-state assemblies. The molecular structure of I in the solid state consists of a 3-dimensional network in which each unit of Mo2(TiPB)2(nic)2 acts as a donor and acceptor via N to Mo coordination. In the structure of I·2DMSO, the DMSO ligands coordinate axially with the Mo−Mo bond via oxygen. The reaction between I and Rh2(O2CMe)4 is shown to give a 1-D polymeric chain in the solid state: [{Rh2(O2CMe)4}{Mo2(TiPB)2(nic)2}]∞, II. A similar structure was found for the product involving Rh2(O2CCMe3)4. Evidence is also reported for the formation of [(1,5-COD)MePt]2[μ-Mo2(TiPB)2(nic)2](PF6)2, III, and [(1,5-COD)Pt(μ-I)(PF6)2]n.
Figure 1: Evolution of the maximum depth reached during the first trip to sea in two elephant seal species. from Contrasting offspring dependence periods and diving development rates in two closely related marine mammal species
Creators: name: Jouma'a, Joffrey
name: Orgeret, Florian
name: Picard, Baptiste
name: Robinson, Patrick W.
name: Weimerskirch, Henri
name: Guinet, Christophe
name: Costa, Daniel P.
name: Beltran, Roxanne S.
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310901
subject: Animal behaviour

description: Development of depth throughout the first trip to sea in northern (n = 4) and southern elephant seals (n = 9) estimated from generalized additive models. The solid lines represent the means, and the shaded areas represent the 95% confidence intervals. Marginal density plots represent the spread of data for each species. Depth of 260 meters is reached in 30 days for northern elephant seals and 160 for southern elephant seals.
Figure 2: Evolution of dive duration during the first trip to sea in two elephant seal species. from Contrasting offspring dependence periods and diving development rates in two closely related marine mammal species
Creators: name: Jouma'a, Joffrey
name: Orgeret, Florian
name: Picard, Baptiste
name: Robinson, Patrick W.
name: Weimerskirch, Henri
name: Guinet, Christophe
name: Costa, Daniel P.
name: Beltran, Roxanne S.
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310901
subject: Animal behaviour

description: Development of dive duration throughout the first trip to sea in northern (n = 4) and southern elephant seals (n = 9) estimated from generalized additive models. The solid lines represent the means, and the shaded areas represent the 95% confidence intervals. Marginal density plots represent the spread of data for each species. Dive duration of 11.15 min is reached on the first day of northern elephant seals' trip to sea and in 125 days for southern elephant seals.
Antibacterial capability characterization of polymer-nanoparticle composites using high-throughput microfluidic platform
Creators: name: Kheiri, Sina
Publisher: name: University of British Columbia
Year: 2018

description: Nanoparticles have been significantly employed in the number, variety, and function to create advanced materials with antibacterial capability. Despite considerable recent progress in the development of advanced material technology, the quest to fabricate optimized antibacterial materials remains a high research priority in biomedical and food packaging industries. This thesis presents a study to characterize and optimized antibacterial capability of liquid silicone rubber (LSR) and nanoparticle (NP) composites. Over the past decades, inorganic NPs, particularly metal oxide NPs, have attracted a great attention because of their capability of strong inhibitory and bactericidal effects. Three representative NPs (e.g., ZnO, TiO₂, and Ag) with different concentrations capable of achieving antibacterial status were tested. To optimize various parameters such as types of materials, concentrations, and processing condition, a high-throughput platforms using microsystems technology are desirable, which enables researchers to minimize the usage of materials and conduct multiple experiments at a time. The antibacterial efficiency of the fabricated LSR/NP nanocomposites were evaluated through the high-throughput microfluidic platforms and viable counts technique. LSR/TiO2 nanocomposites demonstrated the best antibacterial nanocomposite. Also, the viability of E. coli, which were exposed to LSR/NPs on the microfluidic platform, was assessed and studied using the live/dead assay method. It was also found from the both methods that the antibacterial capability of the nanocomposites was decreased after 15 wt%.
The targum (1879:Mar.)
Creators: name: No Name Supplied
Publisher: name: Targum Association
Year: 1879

description: Some University historians indicate that the Targum was first published as an annual in 1867, but of this we have no extant evidence. In January 1869, the Targum as we now know it, made its appearance as a monthly paper that concerned itself with student “literary contributions” and college news as well as serving as a vehicle for bringing news to alumni and the general public. The newspaper, which originally was for sale, varied in frequency over the years as did its title (The Targum, Rutgers Targum, Rutgers Daily Targum, and Daily Targum). The newspaper has continuously been published since 1869 with the exception of 19 months during the second world war, between February 1944 and October 1945. The Targum was published by the students of Rutgers College, and later Rutgers University—New Brunswick represented through the years as the Targum Association, Rutgers Targum Association, and Rutgers College Targum. As a student organization, the Targum operated under the oversight of the dean of students and student government but in October 1980, the Targum became an independent college paper.
Global top-down smoke-aerosol emissions estimation using satellite fire radiative power measurements
Creators: name: Ichoku, C.
name: Ellison, Luke
Publisher: name: EGU
Year: 2014

description: Fire emissions estimates have long been based on bottom-up approaches that are not only complex, but also fraught with compounding uncertainties. We present the development of a global gridded (1° × 1°) emission coefficients (Cₑ) product for smoke total particulate matter (TPM) based on a top-down approach using coincident measurements of fire radiative power (FRP) and aerosol optical thickness (AOT) from the Moderate-resolution Imaging Spectro-radiometer (MODIS) sensors aboard the Terra and Aqua satellites. This new Fire Energetics and Emissions Research version 1.0 (FEER.v1) Cₑ product has now been released to the community and can be obtained from http://feer.gsfc.nasa.gov/, along with the corresponding 1-to-1 mapping of their quality assurance (QA) flags that will enable the Cₑ values to be filtered by quality for use in various applications. The regional averages of Cₑ values for different ecosystem types were found to be in the ranges of 16–21 g MJ⁻¹ for savanna and grasslands, 15–32 g MJ⁻¹ for tropical forest, 9–12 g MJ⁻¹ for North American boreal forest, and 18–26 g MJ⁻¹ for Russian boreal forest, croplands and natural vegetation. The FEER.v1 Cₑ product was multiplied by time-integrated FRP data to calculate regional smoke TPM emissions, which were compared with equivalent emissions products from three existing inventories. FEER.v1 showed higher and more reasonable smoke TPM estimates than two other emissions inventories that are based on bottom-up approaches and already reported in the literature to be too low, but portrayed an overall reasonable agreement with another top-down approach. This suggests that top-down approaches may hold better promise and need to be further developed to accelerate the reduction of uncertainty associated with fire emissions estimation in air-quality and climate research and applications. Results of the analysis of FEER.v1 data for 2004–2011 show that 65–85 Tg yr⁻¹ of TPM is emitted globally from open biomass burning, with a generally decreasing trend over this short time period. The FEER.v1 Cₑ product is the first global gridded product in the family of "emission factors", that is based essentially on satellite measurements, and requires only direct satellite FRP measurements of an actively burning fire anywhere to evaluate its emission rate in near-real time, which is essential for operational activities, such as the monitoring and forecasting of smoke emission impacts on air quality.
Оптические методы контроля состояния изоляции обмоток статора турбогенератора
Creators: name: Владимировна, Шевченко Валентина
name: Николаевич, Минко Александр
Publisher: name: Zenodo
Year: 2017
Subjects: турбогенераторы
ТГ
изоляция обмоток статора ТГ
оптические методы контроля
тепловизоры
световолоконная оптика
алюмоиттриевый гранат
ремонты ТГ

description: На русском: [Шевченко В.В., Минко А.Н. Оптические методы контроля состояния изоляции обмоток статора турбогенератора // Тезисы докладов 25-й международной научно-практической конференции "Информационные технологии: наука, техника, технология, образование, здоровье" (MicroCAD-2017), 17-19 мая 2017 года, Харьков (ISSN 2222-2944), в 4-х частях, часть 2, cекция 9 "Электромеханическое и электрическое преобразование энергии". – Украина,  Харьков: НТУ "ХПИ", 2017. – С. 179. https://doi.org/10.5281/zenodo.2600341]

Ключевые слова: турбогенераторы (ТГ), изоляция обмоток статора ТГ, оптические методы контроля, тепловизоры, световолоконная оптика, алюмоиттриевый гранат, ремонты ТГ.

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Все материалы конференции и программа конференции на сайте НТУ "ХПИ".

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Оптические методы контроля состояния изоляции обмоток статора турбогенератора
Creators: name: Владимировна, Шевченко Валентина
name: Николаевич, Минко Александр
Publisher: name: Zenodo
Year: 2017
Subjects: турбогенераторы
ТГ
изоляция обмоток статора ТГ
оптические методы контроля
тепловизоры
световолоконная оптика
алюмоиттриевый гранат
ремонты ТГ

description: На русском: [Шевченко В.В., Минко А.Н. Оптические методы контроля состояния изоляции обмоток статора турбогенератора // Тезисы докладов 25-й международной научно-практической конференции "Информационные технологии: наука, техника, технология, образование, здоровье" (MicroCAD-2017), 17-19 мая 2017 года, Харьков (ISSN 2222-2944), в 4-х частях, часть 2, cекция 9 "Электромеханическое и электрическое преобразование энергии". – Украина,  Харьков: НТУ "ХПИ", 2017. – С. 179. https://doi.org/10.5281/zenodo.2600341]

Ключевые слова: турбогенераторы (ТГ), изоляция обмоток статора ТГ, оптические методы контроля, тепловизоры, световолоконная оптика, алюмоиттриевый гранат, ремонты ТГ.
The giant outburst of EXO 2030+375 - II. Broadband spectroscopy and evolution
Creators: name: Ballhausen, R.
name: Thalhammer, P.
name: Pradhan, P.
name: Sokolova-Lapa, E.
name: Stierhof, J.
name: Pottschmidt, Katja
name: Wilms, J.
name: Coley, J. B.
name: Kretschmar, P.
name: Fürst, F.
name: Becker, P.
name: West, B.
name: Malacaria, C.
name: Wolff, M. T.
name: Rothschild, R.
name: Staubert, R.
Publisher: name: EDP Sciences
Year: 2024

description: In 2021, the high-mass X-ray binary EXO 2030+375 underwent a giant X-ray outburst, the first since 2006, that reached a peak flux of ∼600 mCrab (3–50 keV). The goal of this work is to study the spectral evolution over the course of the outburst, search for possible cyclotron resonance scattering features (CRSFs), and to associate spectral components with the emission pattern of the accretion column. We used broadband spectra taken with the Nuclear Spectroscopic Telescope Array (NuSTAR), the Neutron Star Interior Composition Explorer (NICER), and Chandra near the peak and during the decline phase of the outburst. We describe the data with established empirical continuum models and perform pulse-phase-resolved spectroscopy. We compare the spectral evolution with pulse phase using a proposed geometrical emission model. We find a significant spectral hardening toward lower luminosity, a behavior that is expected for super-critical sources. The continuum shape and evolution cannot be described by a simple power-law model with exponential cutoff; it requires additional absorption or emission components. We can confirm the presence of a narrow absorption feature at ∼10 keV in both NuSTAR observations. The absence of harmonics puts into question the interpretation of this feature as a CRSF. The empirical spectral components cannot be directly associated with identified emission components from the accretion column.
RTS2 - the Remote Telescope System
Creators: name: Kubánek, Petr
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: RTS2 is an open source observatory manager. It was written from scratch in the C++ language, with portability and modularity in mind. Its driving requirements originated from quick follow-ups of Gamma Ray Bursts. After some years of development it is now used to carry tasks it was originally not intended to carry. This article presents the current development status of the RTS2 code. It focuses on describing strategies which worked as well as things which failed to deliver expected results.
description: 9 pages, 3 figures, Workshop on Robotic Autonomous Observatories, M\'alaga, Spain, 18-21 May 2009
title: Regelung redundant aktuierter Steer-by-Wire Systeme
Creators: name: Ewald, Volker
Publisher: name: UNSPECIFIED
Year: 2022

description: Die Fahrzeuglenkung stellt eine der wichtigsten Schnittstellen zwischen dem Fahrer und der Fahrzeugdynamik dar. Dabei kann mit dieser nicht nur der Kurs des Fahrzeugs eingestellt werden, sondern auch gezielt Rückmeldungen an den Fahrer gegeben werden, in welchem querdynamischen Zustand sich das Fahrzeug aktuell befindet. Die Evolution der Lenkung von der rein mechanischen Lenkung, über die hydraulisch unterstützte Lenkung, zur elektromechanischen Lenkung, ermöglicht schon heute den Einsatz von Fahrerassistenzsystemen, die direkt die Fahrzeugquerdynamik beeinflussen. Jedoch kommen diese Systeme an ihre Grenzen, da nach wie vor die Lenkung durch ihre Mechanik, bezüglich der Eingriffsmöglichkeiten von Fahrerassistenzsystemen, limitiert ist. Einen Ausweg aus diesem Problem bieten Steer-by-Wire (SbW) Systeme, die eine mechanische Entkopplung des Menschen von der Fahrzeugquerdynamik ermöglichen. Jedoch müssen sich diese SbW-Systeme, wenn kein Eingriff eines Fahrerassistenzsystems erfolgt, genau so komfortabel wie eine heutige elektrische Servolenkung (EPS) anfühlen und zudem auch bei einem Systemfehler weiterhin die Lenkung des Fahrzeugs zulassen. In dieser Arbeit wird daher eine neuartige Regelung für redundant aktuierte SbW-Systeme vorgestellt, die zum einen ermöglicht, dass ein SbW-System sich genau so anfühlt wie ein EPS-System und zum anderen die Redundanz dazu genutzt wird, einen Fail-Operational Betrieb des Systems sicherzustellen. Der Ausgangspunkt der Arbeit ist die Modellbildung des redundant aktuierten Lenksystems und seiner Umgebung. Im Rahmen dieser Modellbildung wird ein Modell des Gesamtsystems Fahrer-Lenkung-Fahrzeugquerdynamik hergeleitet. Anschließend erfolgt eine Systemanalyse, in der die dynamischen Eigenschaften des Systems und der Umgebungsmodelle, wie Passivität, Steuerbarkeit und Beobachtbarkeit, herausgearbeitet werden. Danach wird ein reduziertes Zustandsraum-Modell, das für den Reglerentwurf geeignet ist, hergeleitet. Im Rahmen des Reglerentwurfs werden zunächst unterschiedliche Regelungskonzepte für SbW-Systeme vorgestellt und deren Vor- und Nachteile diskutiert. Auf dem Zustandsraummodell aufbauend werden zwei Regler zur Regelung des SbW-Systems entworfen. Dabei zeichnet sich der Verkopplungsregler durch einen geringen Implementierungsaufwand und weniger Messgrößen aus, während die entworfene robuste Regelung eine Reglerkonfiguration bereitstellt, die ein besseres Lenkgefühl unter dem Einfluss typischer nichtlinearer mechanischer Phänomene, wie Reibung und Lose, gegenüber dem Verkopplungsregler ermöglicht. Abschließend werden die entworfenen Regler in der Simulation verifiziert und ihre Eigenschaften bezüglich des Lenkgefühls herausgearbeitet, sowie deren Robustheit bei Aktorausfällen und Störungen untersucht. Dabei kann gezeigt werden, dass das robuste Regelungskonzept ein Fail-Operational Verhalten der Lenkung sichert. Im Anhang werden zudem Messungen von einemPrüfstand präsentiert, welche die Praxistauglichkeit der entwickelten robusten Regelung zeigen.
Copper(I) mediated oligomerisation of a phosphaalkyne
Creators: name: Vogel, Ulf
name: Nixon, John F.
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: 540 Chemie

description: The oligomerisation of tert-butylphosphaalkyne, tBuCP, mediated by Cu(I) complexes yields an unprecedented C4P5 cage compound, which is stabilised in a matrix of copper(I) iodide.
The metallicity of gamma-ray burst environments from high energy observations
Creators: name: Watson, D.
name: Laursen, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gamma-ray bursts (GRBs) and their early afterglows ionise their circumburst material. Only high-energy spectroscopy therefore, allows examination of the matter close to the burst itself. Soft X-ray absorption allows an estimate to be made of the total column density in metals. The detection of the X-ray afterglow can also be used to place a limit on the total gas column along the line of sight based on the Compton scattering opacity. Such a limit would enable, for the first time, the determination of lower limits on the metallicity in the circumburst environments of GRBs. In this paper, we determine the limits that can be placed on the total gas column density in the vicinities of GRBs based on the Compton scattering. We simulate the effects of Compton scattering on a collimated beam of high energy photons passing through a shell of high column density material to determine the expected lightcurves, luminosities, and spectra. We compare these predictions to observations, and determine what limits can realistically be placed on the total gas column density. The smearing out of pulses in the lightcurve from Compton scattering is not likely to be observable, and its absence does not place strong constraints on the Compton depth for GRBs. However, the distribution of observed luminosities of bursts allows us to place statistical, model-dependent limits that are typically
description: 4 pages, 4 figures, submitted to A&A letters
Improving PSF calibration in confocal microscopic imaging---estimating and exploiting bilateral symmetry
Creators: name: Bissantz, Nicolai
name: Holzmann, Hajo
name: Pawlak, Mirosław
Publisher: name: arXiv
Year: 2011
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: A method for estimating the axis of reflectional symmetry of an image $f(x,y)$ on the unit disc $D=\{(x,y):x^2+y^2\leq1\}$ is proposed, given that noisy data of $f(x,y)$ are observed on a discrete grid of edge width $Δ$. Our estimation procedure is based on minimizing over $β\in[0,π)$ the $L_2$ distance between empirical versions of $f$ and $τ_βf$, the image of $f$ after reflection at the axis along $(\cosβ,\sinβ)$. Here, $f$ and $τ_βf$ are estimated using truncated radial series of the Zernike type. The inherent symmetry properties of the Zernike functions result in a particularly simple estimation procedure for $β$. It is shown that the estimate $\hatβ$ converges at the parametric rate $Δ^{-1}$ for images $f$ of bounded variation. Further, we establish asymptotic normality of $\hatβ$ if $f$ is Lipschitz continuous. The method is applied to calibrating the point spread function (PSF) for the deconvolution of images from confocal microscopy. For various reasons the PSF characterizing the problem may not be rotationally invariant but rather only reflection symmetric with respect to two orthogonal axes. For an image of a bead acquired by a confocal laser scanning microscope (Leica TCS), these axes are estimated and corresponding confidence intervals are constructed. They turn out to be close to the coordinate axes of the imaging device. As cause for deviation from rotational invariance, this indicates some slight misalignment of the optical system or anisotropy of the immersion medium rather than some irregular shape of the bead. In an extensive simulation study, we show that using a symmetrized version of the observed PSF significantly improves the subsequent reconstruction process of the target image.
description: Published in at http://dx.doi.org/10.1214/10-AOAS343 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Wakefield generation in magnetized plasmas
Creators: name: Holkundkar, A.
name: Brodin, G.
name: Marklund, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We consider wakefield generation in plasmas by electromagnetic pulses propagating perpendicular to a strong magnetic field, in the regime where the electron cyclotron frequency is equal to or larger than the plasma frequency. PIC-simulations reveal that for moderate magnetic field strengths previous results are re-produced, and the wakefield wavenumber spectrum has a clear peak at the inverse skin depth. However, when the cyclotron frequency is significantly larger than the plasma frequency, the wakefield spectrum becomes broad-band, and simultaneously the loss rate of the driving pulse is much enhanced. A set of equations for the scalar and vector potentials reproducing these results are derived, using only the assumption of a weakly nonlinear interaction.
description: 6 pages, 8 figures
Physisorption of an electron in deep surface potentials off a dielectric surface
Creators: name: Heinisch, R. L.
name: Bronold, F. X.
name: Fehske, H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study phonon-mediated adsorption and desorption of an electron at dielectric surfaces with deep polarization-induced surface potentials where multi-phonon transitions are responsible for electron energy relaxation. Focusing on multi-phonon processes due to the nonlinearity of the coupling between the external electron and the acoustic bulk phonon triggering the transitions between surface states, we calculate electron desorption times for graphite, MgO, CaO, (\text{Al}_2\text{O}_3), and (\text{SiO}_2) and electron sticking coefficients for (\text{Al}_2\text{O}_3), CaO, and (\text{SiO}_2). To reveal the kinetic stages of electron physisorption, we moreover study the time evolution of the image state occupancy and the energy-resolved desorption flux. Depending on the potential depth and the surface temperature we identify two generic scenarios: (i)adsorption via trapping in shallow image states followed by relaxation to the lowest image state and desorption from that state via a cascade through the second strongly bound image state in not too deep potentials and (ii)adsorption via trapping in shallow image states but followed by a relaxation bottleneck retarding the transition to the lowest image state and desorption from that state via a one step process to the continuum in deep potentials.
description: 12 pages, 7 figures
Scintillation of thin tetraphenyl butadiene films under alpha particle excitation
Creators: name: Pollmann, Tina
name: Boulay, Mark
name: Kuźniak, Marcin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The alpha induced scintillation of the wavelength shifter 1,1,4,4-tetraphenyl-1,3-butadiene (TPB) was studied to improve the understanding of possible surface alpha backgrounds in the DEAP dark matter search experiment. We found that vacuum deposited thin TPB films emit 882 +/-210 photons per MeV under alpha particle excitation. The scintillation pulse shape consists of a double exponential decay with lifetimes of 11 +/-5 ns and 275 +/-10ns.
description: paper submitted to Nuclear Physics A
1,2,3-Triphosphole derivatives as reactive intermediates
Creators: name: Stubenhofer, Markus
name: Kuntz, Christian
name: Balázs, Gábor
name: Zabel, Manfred
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 540 Chemie

description: The complexes [Cp*E{W(CO)5}2] (E = P, As; Cp* = C5Me5) react with 1,2-diphosphinobenzene to give 1,2,3-triphosphole and 2-arsa-1,3-diphosphole derivatives as reactive intermediates that dimerise to polycyclic phosphorous and arsenic containing cage compounds.
title: Bewertung von Bedienentscheidungen mit Hilfe von Zustandsraummethoden
Creators: name: Hasselberg, Andreas
name: Söffker, Dirk
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2013

description: Neu entwickelte oder geanderte Mensch-Maschine-Systeme werden besonders

beim Einsatz in sicherheitskritischen Bereichen vorab in Simulationen getestet. In diesen

Simulationen sollen mogliche Ursachen fur fehlerhafte bzw. nichtoptimale Verhaltensweisen

aufgedeckt werden, um diese aufbauend auf der analytischen Bewertung zu verbessern. Hierzu

ist auch das Verhalten von Bedienerinnen und Bedienern zu bewerten. Die Bewertung einer

Bedienhandlung setzt in der Regel aber die Kenntnis von real existierenden Alternativen bzw.

der optimalen oder besten Verhaltensweise voraus. In vorangegangenen Arbeiten konnte gezeigt

werden, dass Zustandsraummethoden zur Berechnung der Handlungsalternativen verwendet

werden konnen. Aufgrund vorhandener Einschrankungen hinsichtlich der Vorgabe fester Handlungssequenzen,

wird in diesem Beitrag ein Verfahren vorgeschlagen, mit dem die Alternativen

situationsabhangig bestimmt werden und ist somit im Gegensatz zu fruheren Ansatzen nicht

auf vorgegebene Handlungssequenzen beschrankt. Der zentrale Aspekt dieses Beitrags liegt auf

der Verwendung eines Suchalgorithmus, der aufgabenspezisches Wissen verwendet, um die

Handlungssequenz zu bestimmen. Diese wird zuerst nur fur Teilsysteme bestimmt und in einer

ubergeordneten Suche wird dann die Reihenfolge der Betrachtung der Teilsysteme ermittelt.

Der Algorithmus soll fur eine Flugfuhrungsaufgabe verwendet werden, fur die das erforderliche

aufgabenspezische Wissen in Form von Regeln dargestellt wird.
Semiclassical theory of spin transport in magnetic multilayers
Creators: name: Urban, R.
name: Heinrich, B.
name: Woltersdorf, Georg
Publisher: name: Universität Regensburg
Year: 2003
Subjects: subject: magnetic multilayers, ferromagnetic resonance, exchange interactions (electron), spin dynamics, Maxwell equations
subject: 530 Physik
subject: 75.70.Cn
subject: 75.30.Et
subject: 75.30.Ds
subject: 75.30.Wx
subject: 75.40.Gb
subject: 76.50.+g

description: A semiclassical model of the spin momentum transfer in ferromagnetic film (FM)/normal metal (NM) structures is presented. It is based on the Landau-Lifshitz equation of motion and the exchange interaction in FM, and on the spin diffusion equation in NM. The internal magnetic field is treated by employing Maxwell's equations. A precessing magnetization in FM creates a spin current which is described by spin pumping proposed by Tserkovnyak The back flow of spins from NM into FM is assumed to be proportional to the spin accumulation in NM as proposed by Silsbee These theoretical calculations are tested against the experimental results obtained by different groups. A good agreement was found for Py/Cu samples, but spin pumping is significantly enhanced in Py/Pt systems. (C) 2003 American Institute of Physics.
2-(Hydroxyphenyl)indoles: a new class of mammary tumor-inhibiting compounds
Creators: name: Angerer, Erwin von
name: Prekajac, Jelica
Publisher: name: Universität Regensburg
Year: 1983
Subjects: subject: 540 Chemie

description: l-Allryl-4-chloro-2-(2,6-dichloro-4-hydroxyphenyl)-6-hydroxyindo(l4e,as l kyl =i CHa, CsHs, CaH,) were synthesized by thermolysis of the corresponding NJV’-dialkyl-1,2-diphenylethylenediamineasn d subsequent ether cleavage. They showed an affinity for the estrogen receptor (1% of 178-estradiol) and inhibited the growth of the 9,lO-dimethyl- l,2-benz[u]anthracene (DMBA) induced mammary carcinoma of the Sprague-Dawley (SD) rat. The best result was obtained by the ethyl compound (4b), which reduced the original tumor area by 50% after 4 weeks administration of 6 X 18 (mg/kg)/week. Since 4s and 4b show uterotrophic activity and cytostatic effects against hormone-independent cells, a dual mode of action has to be considered for the tumor inhibition.
Controlled Oligomerization of Lewis Acid/Base-Stabilized Phosphanylalanes [Kontrollierte Oligomerisierung von Lewis-Säure/Base-stabilisierten Phosphanylalanen]
Creators: name: Bodensteiner, Michael
name: Vogel, Ulf
name: Timoshkin, Alexey Y.
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: Aluminium; H2-Eliminierungen; Lewis-Basen; Lewis-Säuren; Phosphor
subject: 540 Chemie

description: PAls should stick together: The cyclo-trimer 2 is obtained by H2 elimination of Lewis acid/base-stabilized parent compound of the phosphanylalanes 1. The elimination is controlled by fine tuning the temperature and solvent conditions. A subsequent H2 elimination produces the ladder compound 3. Compounds 2 and 3 are the first of a new class of Group 13/15 compounds which show no additionally donor-acceptor bonds within the framework.
Modelling geochemical dispersion above a buried polymetallic volcanogenic massive sulphide deposit in a recently glaciated terrain
Creators: name: Bodnar, Matthew Michael
Publisher: name: University of British Columbia
Year: 2018

description: Modern society requires a resource supply for the continual development of infrastructure and technology. The discovery of new mineral deposits is challenging as much of North America is covered by Quaternary sediments that obscure bedrock geology. Enhanced methods in exploration geochemistry, capable of detecting mineral deposits through complex cover, must be developed to satisfy global resource demands. Detailed landscape and surficial material mapping over the Lara polymetallic volcanogenic massive sulphide (VMS) deposit were used to establish a landscape evolution model and identify natural processes that govern geochemical responses in shallow soil in glaciated terrain. Upper B horizon soil and physicochemical property measurements were collected along four transects over the deposit and host-rocks and was analyzed by aqua regia ICP-MS/AES, fpXRF and magnetic susceptibility. Select samples were analyzed by sequential extraction and/or for Cu and Zn isotopes to establish the provenance of geochemical responses. Follow-up Ah horizon soil and western hemlock bark samples from a subset of the grid were analyzed by modified aqua regia ICP-MS to determine the role of biochemical cycling. Passive hydrocarbon collector modules were installed at each B horizon soil sample location. Five surficial material domains including till, alluvium and colluvium were identified representing complex alpine glacial and paraglacial processes. Most recent glacial ice flow was valley controlled and sub-parallel to the strike of VMS mineralization as well as a 1-2 m wide pyrite-chalcopyrite stringer zone that occurs 150 m north of the VMS. The highest Zn response occurs over the Lara VMS; however, Cr, Ni, Co and Sc content and magnetic susceptibility indicate this is due to elevated gabbroic content in the till matrix. A response of Zn, Cu, Cd, Mo, Se, Hg, and Te occur over the pyrite zone. Copper isotopes and sequential extraction indicate that geochemical responses are attributed to a clastic source. Zinc, copper, and cadmium in Ah soil and tree bark is controlled by surficial material and geomorphology. Geochemical responses in B horizon soil above the VMS and pyrite zone is interpreted to be caused clastic dispersion of mineralization and mafic host-rocks by glacial transport with negligible input by biochemical cycling.
Application in the Ethanol Fermentation of Immobilized Yeast Cells in Matrix of Alginate/Magnetic Nanoparticles, on Chitosan-Magnetite Microparticles and Cellulose-coated Magnetic Nanoparticles
Creators: name: Ivanova, Viara
name: Petrova, Petia
name: Hristov, Jordan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Biological Physics (physics.bio-ph)
subject: Other Quantitative Biology (q-bio.OT)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Saccharomyces cerevisiae cells were entrapped in matrix of alginate and magnetic nanoparticles and covalently immobilized on magnetite-containing chitosan and cellulose-coated magnetic nanoparticles. Cellulose-coated magnetic nanoparticles with covalently immobilized thermostable α-amylase and chitosan particles with immobilized glucoamylase were also prepared. The immobilized cells and enzymes were applied in column reactors - 1/for simultaneous corn starch saccharification with the immobilized glucoamylase and production of ethanol with the entrapped or covalently immobilized yeast cells, 2/ for separate ethanol fermentation of the starch hydrolysates with the fixed yeasts. Hydrolysis of corn starch with the immobilized α-amylase and glucoamylase, and separate hydrolysis with the immobilized α-amylase were also examined. In the first reactor the ethanol yield reached approx. 91% of the theoretical; the yield was approx. 86% in the second. The ethanol fermentation was affected by the type of immobilization, the initial particle loading, feed sugar concentration and the dilution rate. The ethanol productivity with entrapped cells reached 264.0 g/L.h at particle loading rate 70% and dilution rate 3.0 h-1 with reducing sugar concentration of 200.0 g/L. The prepared magnetic particles with fixed yeast cells were stable at 4oC in saline for more than 1 month. .
description: 11 pages, 6 tables, 7 figures, 51 references
A Network Analysis Approach to fMRI Condition-Specific Functional Connectivity
Creators: name: Shinkareva, Svetlana V.
name: Gudkov, Vladimir
name: Wang, Jing
Publisher: name: arXiv
Year: 2010
Subjects: subject: Applications (stat.AP)
subject: Chaotic Dynamics (nlin.CD)
subject: Biological Physics (physics.bio-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: In this work we focus on examination and comparison of whole-brain functional connectivity patterns measured with fMRI across experimental conditions. Direct examination and comparison of condition-specific matrices is challenging due to the large number of elements in a connectivity matrix. We present a framework that uses network analysis to describe condition-specific functional connectivity. Treating the brain as a complex system in terms of a network, we extract the most relevant connectivity information by partitioning each network into clusters representing functionally connected brain regions. Extracted clusters are used as features for predicting experimental condition in a new data set. The approach is illustrated on fMRI data examining functional connectivity patterns during processing of abstract and concrete concepts. Topological (brain regions) and functional (level of connectivity and information flow) systematic differences in the ROI-based functional networks were identified across participants for concrete and abstract concepts. These differences were sufficient for classification of previously unseen connectivity matrices as abstract or concrete based on training data derived from other people.
A comparative study on q-deformed fermion oscillators
Creators: name: Algin, Abdullah
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper, the algebras, representations, and thermostatistics of four types of fermionic q-oscillator models, called fermionic Newton (FN), Chaichian-Kulish-Ng (CKN), Parthasarathy-Viswanathan-Chaichian (PVC), Viswanathan-Parthasarathy-Jagannathan-Chaichian (VPJC), are discussed. Similarities and differences among the properties of these models are revealed. Particular emphasis is given to the VPJC-oscillators model so that its Fock space representation is analyzed in detail. Possible physical applications of these models are concisely pointed out.
description: 32 pages, 2 figures, to appear in Int. J. Theor. Phys. (IJTP)
Transition Radiation by Neutrinos
Creators: name: Ioannisian, A. N.
name: Ioannisian, D. A.
name: Kazarian, N. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the transition radiation process $ν\to νγ$ at an interface of two media. The neutrinos are taken to be with only standard-model couplings. The medium fulfills the dual purpose of inducing an effective neutrino-photon vertex and of modifying the photon dispersion relation. The transition radiation occurs when at least one of those quantities have different values in different media. The neutrino mass is ignored due to its negligible contribution. We present a result for the probability of the transition radiation which is both accurate and analytic. For $E_ν=1$ MeV neutrino crossing polyethylene-vacuum interface the transition radiation probability is about $10^{-39}$ and the energy intensity is about $10^{-34}$ eV. At the surface of the neutron stars the transition radiation probability may be $\sim 10^{-20}$. Our result on three orders of magnitude is larger than the results of previous calculations.
Spreading with evaporation and condensation in one-component fluids
Creators: name: Teshigawara, Ryohei
name: Onuki, Akira
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate the dynamics of spreading of a small liquid droplet in gas in a one-component simple fluid, where the temperature is inhomogeneous around 0.9Tc and latent heat is released or generated at the interface upon evaporation or condensation (with Tc being the critical temperature). In the scheme of the dynamic van der Waals theory, the hydrodynamic equations containing the gradient stress are solved in the axisymmetric geometry. We assume that the substrate has a finite thickness and its temperature obeys the thermal diffusion equation. A precursor film then spreads ahead of the bulk droplet itself in the complete wetting condition. Cooling the substrate enhances condensation of gas onto the advancing film, which mostly takes place near the film edge and can be the dominant mechanism of the film growth in a late stage. The generated latent heat produces a temperature peak or a hot spot in the gas region near the film edge. On the other hand, heating the substrate induces evaporation all over the interface. For weak heating, a steady-state circular thin film can be formed on the substrate. For stronger heating, evaporation dominates over condensation, leading to eventual disappearance of the liquid region.
description: 12 pages, 14 figures
Review of Clare Carlisle's The Marriage Question: George Eliot's Double Life. A Philosophical Search for George Eliot's Figure in the Carpet
Creators: name: Rilett, Beverley Park
Publisher: name: George Eliot Review Online
Year: 2023
Subjects: Biography

description: Article from the George Eliot Review. Digitized and hosted by the George Eliot Review Online, editor Beverley Park Rilett.
Slowly rotating Kerr black hole as a solution of Einstein-Cartan gravity extended by a Chern-Simons term
Creators: name: Cambiaso, Mauro
name: Urrutia, Luis F.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the nondynamical Chern-Simons (CS) modification to General Relativity (GR) in the framework of the Einstein-Cartan formulation, as providing a way to incorporate a slowly rotating Kerr black hole in the space of solutions. Our proposal lies on considering the CS term as a source of torsion and on an iterative procedure to look for vacuum solutions of the system, by expanding the tetrad, the connection and the embedding parameter, in powers of a dimensionless small parameter $β$ which codifies the CS coupling. Starting from a torsionless zeroth-order vacuum solution we derive the second-order differential equation for the $\mathcal{O}(β)$ corrections to the metric, for an arbitrary embedding parameter. Furthermore we can show that the slowly rotating Kerr metric is an $\mathcal{O}(β)$ solution of the system either in the canonical or the axial embeddings.
description: "Presented at the Fifth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 2010"
Type-Ia supernovae: new clues to their progenitors from the delay-time distribution
Creators: name: Maoz, Dan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Despite their prominent role in cosmography, little is yet known about the nature of type-Ia supernovae (SNe Ia), from the identity of their progenitor systems, through the evolution of those systems up to ignition and explosion, and to the causes of the environmental dependences of their observed properties. I briefly review some of those puzzles. I then focus on recent progress in reconstructing the SN Ia delay time distribution (DTD) -- the SN rate versus time that would follow a hypothetical brief burst of star formation. A number of measurements of the DTD over the past two years, using different methods and based on SNe Ia in different environments and redshift ranges, are converging. At delays 1
description: Invited review, to appear in proceedings of "Binary Star Evolution", held in Mykonos, Greece, June 22-25, 2010
Review of Franco Marucci's George Eliot's 'The Lifted Veil', A Sequential and Contextual Reading
Creators: name: McKay, Brenda
Publisher: name: George Eliot Review Online
Year: 2022
Subjects: The Lifted Veil

description: Article from the George Eliot Review. Digitized and hosted by the George Eliot Review Online, editor Beverley Park Rilett.
'You know nothing, dear Hetty, of the world in which I must always live': Placing Hetty and the Role of Toponomy
Creators: name: Gatehouse, Delphine
Publisher: name: George Eliot Review Online
Year: 2022
Subjects: Adam Bede

description: Article from the George Eliot Review. Digitized and hosted by the George Eliot Review Online, editor Beverley Park Rilett.
The Conflict Between Originality and Conventionality: The Liberated Individual in The Mill on the Floss and J. S. Mill's On Liberty
Creators: name: Tan, Kunyu
Publisher: name: George Eliot Review Online
Year: 2023
Subjects: The Mill on the Floss

description: Article from the George Eliot Review. Digitized and hosted by the George Eliot Review Online, editor Beverley Park Rilett.
Thermolyse ortho-chlorsubstituierter 1,2-Diarylethylendiamine
Creators: name: Angerer, Erwin von
name: Taneja, Ashok K.
name: Ringshandl, Richard
name: Schönenberger, Helmut
Publisher: name: Universität Regensburg
Year: 1980
Subjects: subject: 540 Chemie

description: Die Bis(2,6-dichlorphenyl)ethylendiamine 1a - d reagieren bei der Thermolyse zu Indolen und im Falle der Racemate 1b und d auch zu Tetrahydroindoloindolen. Die d,1-Form der entsprechenden 2,4-Dichlorverbindung 1f führt zu einem 2,4,5-Triarylimidazolidin, die meso-Form 1e zu einem Aziridin, dessen Bildung über ein 2,cis-4,5-Triarylimidazolidin durch mechanistische Betrachtungen wahrscheinlich gemacht werden konnte.