cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Regulation of mesenchymal stem cell and chondrocyte differentiation by MIA
Creators: name: Tscheudschilsuren, G.
name: Bosserhoff, A. K.
name: Schlegel, J.
name: Vollmer, D.
name: Anton, A.
name: Alt, V.
name: Schnettler, R.
name: Brandt, J.
name: Proetzel, G.
Publisher: name: Universität Regensburg
Year: 2006
Subjects: subject: MIA; CD-RAP; BMP; TGF-beta; Growth factor; Differentiation; Stem cell; Cartilage; Chondrocyte; Extracellular matrix; Chemotaxis; Gene expression
subject: 570 Biowissenschaften, Biologie
subject: 610 Medizin

description: Melanoma inhibitory activity (MIA), also referred to as cartilage-derived retinoic acid-sensitive protein (CD-RAP), an 11-kDa secreted protein, is mainly expressed in cartilaginous tissue during embryogenesis and adulthood. Currently, the function of MIA in cartilage tissue is not understood. Here, we describe that MIA acts as a chemotactic factor on the mesenchymal stem cell line C3H10T1/2, stimulating cell migration significantly at concentrations from 0.24 to 240 ng/ml, while inhibiting cell migration at higher doses of 2.4 microg/ml. When analyzing the role of MIA during differentiation processes, we show that MIA by itself is not capable to induce the differentiation of murine or human mesenchymal stem cells. However, MIA influences the action of bone morphogenetic protein (BMP)-2 and transforming growth factor (TGF)-beta 3 during mesenchymal stem cell differentiation, supporting the chondrogenic phenotype while inhibiting osteogenic differentiation. Quantitative RT-PCR analysis revealed the up-regulation of the cartilage markers MIA, collagen type II and aggrecan in human mesenchymal stem cell (HMSC) cultures differentiated in the presence of MIA and TGF-beta 3 or BMP-2 when compared to HMSC cultures differentiated in the presence of TGF-beta 3 or BMP-2 alone. Further, MIA down-regulates gene expression of osteopontin and osteocalcin in BMP-2 treated HMSC cultures inhibiting the osteogenic potential of BMP-2. In the case of human primary chondrocytes MIA stimulates extracellular matrix deposition, increasing the glycosaminoglycan content. Therefore, we postulate that MIA is an important regulator during chondrogenic differentiation and maintenance of cartilage.
Miejsce Romana Ingardena w rozwoju fenomenologii / Roman Ingarden's place in the development of phenomenology
Creators: name: Woleński, Jan
Publisher: name: Zenodo
Year: 2021
Subjects: Roman Ingarden
ontologia
estetyka
redukcja
poznanie aprioryczne
ontology
asethetics
reduction
a priori knowledge

description: Roman Ingarden należał do grona uczniów Edmunda Husserla z okresu getyngeńskiego. Nie
 podzielił zmiany poglądów swego nauczyciela w kierunku fenomenologii transcendentalnej i do
 końca swej twórczości opowiadał się za fenomenologią realistyczną. W historii ruchu
 fenomenologicznego jest przede wszystkim traktowany jako estetyk, głównie dzięki swojej słynnej
 książce O dziele literackim, wydanej w 1931 r. po niemiecku. Jego prace z dziedziny ontologii
 ogólnej, epistemologie i etyki są mniej znane, chociaż zawierają analizy filozoficzne
 o pierwszorzędnym znaczeniu. Roman Ingarden belonged to Edmund Husserl’s students from the Göttingen period. Ingarden did
 not accepted moving his teacher to transcendental phenomenology and opted for realistic
 phenomenology until the end of his philosophical career. In the history of phenomenological
 movement, Ingarden is mainly presented as an aesthetician, mostly due to his famous book The
 Literary Work of Art, published in German in 1931. His writings on general ontology,
 epistemology and ethics are less known, although they present philosophical analyses of the first
 importance.
description: {"references": ["Embree, Lester et al. (eds.) 1997: Encyclopedia of Phenomenology. Dordrecht: Kluwer.", "Ingarden, Roman 1974: Wst\u0119p do fenomenologii Husserla. Warszawa: Pa\u0144stwowe Wydawnictwo Naukowe.", "P\u0142otka, Witold (red.) 2014: Wprowadzenie do fenomenologii. Interpretacje, zastosowania, problemy, t. 1\u20132. Warszawa: Wydawnictwo IFiS PAN.", "Walig\u00f3ra, Marcin 2013: Wst\u0119p do fenomenologii. Krak\u00f3w: Universitas.", "Zahavi, Dan (ed.) 2012: The Oxford Handbook of Contemporary Phenomenology. Oxford: Oxford University Press."]}
Comparison of reduced and standard light application in photodynamic therapy of the eye in two rabbit models
Creators: name: Framme, C.
name: Flucke, B.
name: Birngruber, R.
Publisher: name: Universität Regensburg
Year: 2006
Subjects: subject: PDT; AMD; Choroidal neovascularization; Radiant exposure; Threshold
subject: 610 Medizin

description: BACKGROUND: Current PDT treatment for age-related macular degeneration uses a standard radiant exposure of 50 J/cm(2) at an irradiance of 600 mW/cm(2). However; there is a general problem with the unusually high irradiance; in fact, the rate of photochemical production of singlet oxygen may be limited by insufficiently oxygenized neovascular tissue. It was the aim of this study to evaluate the efficacy of verteporfin (Visudyne) photoactivation to induce thrombosis of choriocapillaries and in experimentally induced corneal neovascularizations in rabbits by varying irradiance and retinal radiant exposure. MATERIALS AND METHODS: The light-dose threshold to induce micro-thrombosis in the choriocapillaries (seven eyes) and in corneal neovascularizations (eight eyes) of Chinchilla-Bastard rabbits using different retinal irradiances (100 and 600 mW/cm(2)) at different radiant exposures (20, 10, 5, 2.5, 1.25, 0.62, and 0.3 J/cm(2)) was evaluated. Induction of neovascularizations was performed 7 days prior to PDT treatment using intracorneal silk sutures. A dose of 2 mg/kg verteporfin was intravenously infused 10 min before standard PDT. The criterion for vascular thrombosis was vessel closure as determined by fluorescein angiography 1 h and 1 day post exposure. RESULTS: Experiments on the choroid revealed vessel closure 1 h after irradiation at ED(50) = 10.8 J/cm(2) (both 600 and 100 mW/cm(2)) and after 24 h at ED(50) = 2.4 J/cm(2) (600 mW/cm(2)) versus 1.8 J/cm(2) (100 mW/cm(2)). Vessel closure was enhanced at irradiation with 100 mW/cm(2). Regarding corneal neovascularizations, vessel thrombosis was observable by dark appearance of irradiated clotted neovascular tissue and angiographically by a lack of leakage at ED(50) thresholds of 0.62 J/cm(2) (1 h) and 0.41 J/cm(2) (1 day) for 100 mW/cm(2) and of 0.99 J/cm(2) (1 h), and 0.67 J/cm(2) (1 day) for 600 mW/cm(2). Thus in both experiments thresholds for vessel closure were reduced by a factor of 1.5 for the lower intensity. Histology revealed more selective vessel occlusion without RPE and photoreceptor damage for 100 mW/cm(2) rather than 600 mW/cm(2) intensity at threshold irradiation. CONCLUSION: Low-intensity PDT with verteporfin for neovascular tissue seems to be more effective than regular high-intensity PDT. Future preclinical trials should address the issue of proper dosimetry for effective PDT in age-related macular degeneration.
Spectrophotometric variability of the magnetic CP star 56 Arietis in spectral region from 1950 to 3200 A
Creators: name: Sokolov, Nikolay A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The spectrophotometric variability of the magnetic CP star 56 Arietis (56 Ari) in the ultraviolet spectral region from 1950 to 3200 A is investigated. This study is based on the archival International Ultraviolet Explorer data obtained at different phases of the rotational cycle. The brightness of 56 Ari is not constant in the investigated wavelengths over the whole rotational period. The monochromatic light curves continuously change their shape with wavelength. This indicates that we do not observe a truly 'null wavelength region' where the monochromatic light curve has a zero amplitude. Probably, an uneven surface distribution of silicon and iron mainly influences the flux redistribution from the far-UV to near-UV spectral regions, although additional sources of opacity may be involved. The redistribution of the flux at phase 0.25 is connected with the nonuniform distribution of silicon on the stellar surface of 56 Ari. On the other hand, the redistribution of the flux at phase 0.65 is quite complex, because there are additional blocking and redistribution of the flux by iron lines in the near-UV spectral region.
description: 10 pages, 7 figures, Accepted 2 March 2010 in Astrophys Space Sci
ENLIGHT RISE - Deliverable 4.2 - Networking events for early career researchers #2
Creators: name: ENLIGHT RISE WP4-Promote Early Career Development & Improve Researcheer Assessment
Publisher: name: Zenodo
Year: 2023
Subjects: European Universities Alliances
Early career researchers
Academic career

description: The ENLIGHT “Research and Innovation agenda with and for Society” (RISE) project aims at establishing foundations and initiating implementation of a joint research and innovation (R&I) agenda within the ENLIGHT European University Alliance. Work package 4 has two specific projects. 4.1 To plan a series of events to support networking/leadership skills for early career researchers (ECRs), and 4.2 is the Researcher Assessment working group. On Wednesday, June 14th, 2023, the second event pertaining to the 4.1 work package took place from 1400-1530 CET. Titled "Academic Careers - The Fun and the Obligations," the event was conducted online. Professor Ingrid Molema, University of Groningen, was the guest presenter.
The impact of nurse work environment on nurse outcomes, nurse-perceived quality of care and patient safety in Saudi Arabia
Creators: name: Alharbi, Amal Ali
Publisher: name: University of British Columbia
Year: 2018

description: Background: The current shortage of nurses jeopardizes the quality and safety of patient care globally, and is particularly serious in Saudi Arabia. There is ample evidence that nurse work environments are important to nurses’ job satisfaction, burnout, and retention, and the quality and safety of patient care. However, most of this research has been conducted in the United States and Europe with very little emanating from Saudi Arabia or the Middle East. Purpose: This study investigated relationships between components of nurse work environment and nurse outcomes and nurse-perceived quality of care and patient safety. Methods: This correlational study was conducted using cross-sectional data collected from 496 registered nurses working in a large tertiary hospital in Riyadh, Saudi Arabia. Participants completed an online survey similar to that used in RN4Cast studies. Nurse-reported measures were used to assess nurses’ perceptions of their work environments, nurse-outcomes (i.e., job satisfaction, burnout, and intent to leave), and nurses’ perceptions of quality of care and patient safety. Hierarchical logistic regression was conducted to examine the relationships between components of nurse work environment and nurse and patient outcomes, after controlling for nurse and patient characteristics. Findings: Nurses’ perceptions of staffing and resource adequacy was predictive of all nurse outcomes except for intent to leave whereas nurse manager ability and leadership was found to be predictive only of job satisfaction. In terms of patient outcomes, staffing and resources adequacy and nursing foundation for quality of care were found to be the only independent predictors of quality of care and patient safety. Implications for Nurse Leaders: Nurse leaders in Saudi Arabia should give special attention to staffing and resources adequacy, nursing management and leadership, and nursing foundation for care delivery at the unit level. Hospitals in Saudi Arabia should strive for magnet-like qualities as they play a critical role in the recruitment and retention of nurses and contribute to better quality and safe care delivery. Conclusion: Magnet-like work environments that are culturally sensitive are critical to attracting and retaining Saudi nurses and nurses from other countries who are currently vital to alleviating the nursing shortage in Saudi Arabia.
Micromagnetic Dissipation, Dispersion, and Mode Conversion in Thin Permalloy Platelets
Creators: name: Buess, Matthias
name: Haug, Thomas
name: Scheinfein, M.
name: Back, Christian
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: 530 Physik

description: Micron-sized ferromagnetic Permalloy disks exhibiting an in-plane ferromagnetic vortex structure are excited by a fast rise time perpendicular magnetic field pulse and their modal structure is analyzed. We find azimuthal and axial modes. By a Fourier filtering technique we can separate and analyze the time dependence of individual modes. Analysis of the experimental data demonstrates that the azimuthal modes damp more quickly than the axial modes. We interpret these results as mode conversion from low-frequency azimuthal modes to the fundamental mode which is higher in frequency, i.e., mode-mode coupling in a system with a single Landau-Lifshitz-Gilbert phenomenological damping constant .
Ballistic electron magnetic microscopy on epitaxial spin valves
Creators: name: Heindl, Emanuel
name: Vancea, Johann
name: Back, Christian
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: 530 Physik

description: The tip of a scanning tunnelling microscope has been used as an injector of hot electrons or hot holes into a spin-valve epitaxially grown on n-GaAs$_{67}$P$_{33}$. Spin dependent transport of injected- and hole excited electrons has been studied in an external magnetic field at room temperature. Significant variations in the collector current due to the spin dependent inelastic decay of the hot charge carriers have been measured for parallel and antiparallel configurations of the magnetization of the individual layers. We found magneto-current effects on the order of 600% and relative large transmission values compared to other BEMM-studies. In addition, we investigated the excitation of electron hole pairs with its subsequent electron transport in the spin-valve and found a magneto-current effect with positive sign.
The Araucaria Project. Population effects on the V and I band magnitudes of red clump stars
Creators: name: Pietrzynski, G.
name: Gorski, M.
name: Gieren, W.
name: Laney, D.
name: Udalski, A.
name: Ciechanowska, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present measurements of the V and I band magnitudes of red clump stars in 15 nearby galaxies obtained from recently published homogenous HST photometry. Supplementing these results with similar data for another 8 galaxies available in the literature the populational effects on the V and I band magnitudes of red clump stars were investigated. Comparing red clump magnitudes with the I-band magnitude of the TRGB in a total sample of 23 galaxies possessing very different environments we demonstrate that population effects strongly affect both the V and I band magnitude of red clump stars in a complex way. Our empirical results basically confirm the theoretical results of Girardi and Salaris, and show that optical (VI) photometry of red clump stars is not an accurate method for the determination of distances to nearby galaxies at the present moment, as long as the population effects are not better calibrated, both empirically and theoretically. Near infrared photometry is a much better way to measure galaxy distances with red clump stars given its smaller sensitivity to population effects.
description: AJ in press
title: Synthese und Charakterisierung von Polyurethanschäumen und –beschichtungen ausgehend von Lignin und Ligninderivaten
Creators: name: Zieglowski, Mareike
Publisher: name: UNSPECIFIED
Year: 2020

description: Ziel dieser Arbeit ist die Verwendung von Lignin in Polyurethanschäumen und –beschichtungen. Hierbei soll das Lignin als nachwachsender Rohstoff das benötigte Polyol, welches meist aus fossilen Rohstoffen gewonnen wird, teilweise oder vollständig ersetzen. Das verwendete Kraft Lignin wird zum einen in seiner natürlichen Form eingesetzt, aber auch nach verschiedenen Modifikationen. So wird das Lignin zum einen mit verschiedenen Diisocyanaten umgesetzt und so ein Präpolymer mit Isocyanatfunktionalität gewonnen. Außerdem wird das Lignin mittels Mannich- Reaktion modifiziert und damit mit Amingruppen versehen. Zum Schluss wird die Anzahl der Hydroxygruppen durch die Hydroxymethylierung nachträglich erhöht. Das reine Lignin und die unterschiedlich modifizierten Lignine werden anschließend in 2-Komponten Systeme eingearbeitet und ersetzen Teile des Polyols. Bei den PU-Schäumen wird vor allem die Reaktivität anhand der Start- und Steigzeiten gemessen, aber auch anhand der Dichte und der chemischen Stabilität, welche mittels Extraktion bestimmt wird. Auch die mechanischen und thermischen Eigenschaften werden untersucht. Die Beschichtungen werden vor als balk- Material betrachtet. Hier wird die freistehenden Filme vor allem auf ihre mechanische Beständigkeit untersucht.
Spin dynamics of the antiferromagnetic-to-ferromagnetic phase transition in FeRh on a sub-picosecond time scale
Creators: name: Thiele, Jan-Ulrich
name: Buess, Matthias
name: Back, Christian
Publisher: name: Universität Regensburg
Year: 2004
Subjects: subject: 530 Physik

description: The antiferromagnetic-to-ferromagnetic phase transition in FeRh films induced by heating with a femtosecond laser pulse was investigated using the time-resolved magneto-optical Kerr effect. An initial rise time of the magneto-optical signal of about 500 fs is found as the FeRh is heated through the transition. The data offer a complementary view to previous pump–probe experiments on "simple" ferromagnetic materials and allow a glimpse at the complex interplay between lattice, electron and spin dynamics governing the first-order antiferromagnetic-to-ferromagnetic phase transition of FeRh.
SALL - ToolBox
Creators: name: ELLINOGERMANIKI AGOGI
name: The Lisbon Council
name: University of Cyprus
name: University of Deusto
name: CIÊNCIA VIVA
name: ORT Israel
name: Nemo Science Museum
name: TRACES (France)
name: Netcompany-Intrasoft
Publisher: name: Zenodo
Year: 2023

description: This easy-to-use collection of visually designed summaries showcase the results of the SALL project.
The modular set of materials provide access to valuable information, inspiring success stories, and innovative best practices for readers to implement or sustain a living-lab-based open schooling activities.
The Toolbox provide guidance through the necessary references, making it easy to search and find exactly what is needed.
Work Trends Poll: Post-Election Survey, December 2020
Creators: name: University, John J. Heldrich Center For Workforce Development At Rutgers
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Employment (1); return to job after furlough (1); retirement (1); hourly or salary (1); hours worked per week (1); confidence in federal government (1); national economy (5); job searching in America (4); impact of coronavirus (COVID-19) pandemic (16); concern about economy and job related issues (9); return to normal after pandemic (4); get ahead with hard work (3); agree or disagree on job opportunities (2); threat to American workers (9); support for laid-off workers (4); government economic actions (7); personal financial situation and actions (17); emotional reaction to most important issue (1); 2020 presidential election (20).
Chiral Random Matrix Theory and Chiral Perturbation Theory
Creators: name: Damgaard, P. H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Spontaneous breaking of chiral symmetry in QCD has traditionally been inferred indirectly through low-energy theorems and comparison with experiments. Thanks to the understanding of an unexpected connection between chiral Random Matrix Theory and chiral Perturbation Theory, the spontaneous breaking of chiral symmetry in QCD can now be shown unequivocally from first principles and lattice simulations. In these lectures I give an introduction to the subject, starting with an elementary discussion of spontaneous breaking of global symmetries.
description: Lectures given as mini-course at the XIV Mexican School on Particles and Fields 2010
FABSPACE 2.0: THE OPEN-INNOVATION NETWORK FOR GEODATA-DRIVEN INNOVATION
Creators: name: Del Frate, F.
name: Mothe, J.
name: Barbier, C.
name: Becker, M.
name: Olszewski, R.
name: Soudris, D.
Publisher: name: Zenodo
Year: 2019
Subjects: FabSpace 2.0
ESA-ESRIN
EO Open Science 2017

description: Oral presentation slide
Unbiased Inclination Distributions for Objects in the Kuiper Belt
Creators: name: Gulbis, Amanda
name: Elliot, Jim
name: Adams, Elisabeth
name: Benecchi, Susan
name: Buie, Marc
name: Trilling, David
name: Wasserman, Larry
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Using data from the Deep Ecliptic Survey (DES), we investigate the inclination distributions of objects in the Kuiper Belt. We present a derivation for observational bias removal and use this procedure to generate unbiased inclination distributions for Kuiper Belt objects (KBOs) of different DES dynamical classes, with respect to the Kuiper Belt Plane. Consistent with previous results, we find that the inclination distribution for all DES KBOs is well fit by the sum of two Gaussians, or a Gaussian plus a generalized Lorentzian, multiplied by sin i. Approximately 80% of KBOs are in the high-inclination grouping. We find that Classical object inclinations are well fit by sin i multiplied by the sum of two Gaussians, with roughly even distribution between Gaussians of widths 2.0 -0.5/+0.6 degrees and 8.1 -2.1/+2.6 degrees. Objects in different resonances exhibit different inclination distributions. The inclinations of Scattered objects are best matched by sin i multiplied by a single Gaussian that is centered at 19.1 -3.6/+3.9 degrees with a width of 6.9 -2.7/+4.1 degrees. Centaur inclinations peak just below 20 degrees, with one exceptionally high-inclination object near 80 degrees. The currently observed inclination distribution of the Centaurs is not dissimilar to that of the Scattered Extended KBOs and Jupiter-family comets, but is significantly different from the Classical and Resonant KBOs. While the sample sizes of some dynamical classes are still small, these results should begin to serve as a critical diagnostic for models of Solar System evolution.
description: Accepted for publication in the Astronomical Journal
GRIPS - Gamma-Ray Imaging, Polarimetry and Spectroscopy
Creators: name: Greiner, J.
name: Mannheim, K.
name: Aharonian, F.
name: Ajello, M.
name: Balasz, L. G.
name: Barbiellini, G.
name: Bellazzini, R.
name: Bishop, S.
name: Bisnovatij-Kogan, G. S.
name: Boggs, S.
name: Bykov, A.
name: DiCocco, G.
name: Diehl, R.
name: Elsässer, D.
name: Foley, S.
name: Fransson, C.
name: Gehrels, N.
name: Hanlon, L.
name: Hartmann, D.
name: Hermsen, W.
name: Hillebrandt, W.
name: Hudec, R.
name: Iyudin, A.
name: Jose, J.
name: Kadler, M.
name: Kanbach, G.
name: Klamra, W.
name: Kiener, J.
name: Klose, S.
name: Kreykenbohm, I.
name: Kuiper, L. M.
name: Kylafis, N.
name: Labanti, C.
name: Langanke, K.
name: Langer, N.
name: Larsson, S.
name: Leibundgut, B.
name: Laux, U.
name: Longo, F.
name: Maeda, K.
name: Marcinkowski, R.
name: Marisaldi, M.
name: McBreen, B.
name: McBreen, S.
name: Meszaros, A.
name: Nomoto, K.
name: Pearce, M.
name: Peer, A.
name: Pian, E.
name: Prantzos, N.
name: Raffelt, G.
name: Reimer, O.
name: Rhode, W.
name: Ryde, F.
name: Schmidt, C.
name: Silk, J.
name: Shustov, B. M.
name: Strong, A.
name: Tanvir, N.
name: Thielemann, F. -K.
name: Tibolla, O.
name: Tierney, D.
name: Trümper, J.
name: Varshalovich, D. A.
name: Wilms, J.
name: Wrochna, G.
name: Zdziarski, A.
name: Zoglauer, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We propose to perform a continuously scanning all-sky survey from 200 keV to 80 MeV achieving a sensitivity which is better by a factor of 40 or more compared to the previous missions in this energy range. The Gamma-Ray Imaging, Polarimetry and Spectroscopy (GRIPS) mission addresses fundamental questions in ESA's Cosmic Vision plan. Among the major themes of the strategic plan, GRIPS has its focus on the evolving, violent Universe, exploring a unique energy window. We propose to investigate $γ$-ray bursts and blazars, the mechanisms behind supernova explosions, nucleosynthesis and spallation, the enigmatic origin of positrons in our Galaxy, and the nature of radiation processes and particle acceleration in extreme cosmic sources including pulsars and magnetars. The natural energy scale for these non-thermal processes is of the order of MeV. Although they can be partially and indirectly studied using other methods, only the proposed GRIPS measurements will provide direct access to their primary photons. GRIPS will be a driver for the study of transient sources in the era of neutrino and gravitational wave observatories such as IceCUBE and LISA, establishing a new type of diagnostics in relativistic and nuclear astrophysics. This will support extrapolations to investigate star formation, galaxy evolution, and black hole formation at high redshifts.
description: to appear in Exp. Astron., special vol. on M3-Call of ESA's Cosmic Vision 2010; 25 p., 25 figs; see also www.grips-mission.eu
MPEC 2025-H01 : 2025 GO1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 GO1

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Re-flaring of a Post-Flare Loop System Driven by Flux Rope Emergence and Twisting
Creators: name: Cheng, X.
name: Ding, M. D.
name: Guo, Y.
name: Zhang, J.
name: Jing, J.
name: Wiegelmann, T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In this letter, we study in detail the evolution of the post-flare loops on 2005 January 15 that occurred between two consecutive solar eruption events, both of which generated a fast halo CME and a major flare. The post-flare loop system, formed after the first CME/flare eruption, evolved rapidly, as manifested by the unusual accelerating rise motion of the loops. Through nonlinear force-free field (NLFFF) models, we obtain the magnetic structure over the active region. It clearly shows that the flux rope below the loops also kept rising accompanied with increasing twist and length. Finally, the post-flare magnetic configuration evolved to a state that resulted in the second CME/flare eruption. This is an event in which the post-flare loops can re-flare in a short period of $\sim$16 hr following the first CME/flare eruption. The observed re-flaring at the same location is likely driven by the rapid evolution of the flux rope caused by the magnetic flux emergence and the rotation of the sunspot. This observation provides valuable information on CME/flare models and their prediction.
description: 11 pages, 4 figures, 1 table, accepted for publication in ApJ Letter
Ultrafast Generation of Magnetic Fields in a Schottky Diode
Creators: name: Acremann, Y.
name: Buess, Matthias
name: Back, Christian
name: Dumm, Martin
name: Bayreuther, Günther
name: Pescia, D.
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: 530 Physik

description: For the development of future magnetic data storage technologies, the ultrafast generation of local magnetic fields is essential. Subnanosecond excitation of the magnetic state has so far been achieved by launching current pulses into micro-coils and micro-striplines and by using high-energy electron beams. Local injection of a spin-polarized current through an all-metal junction has been proposed as an efficient method of switching magnetic elements and experiments seem to confirm this. Spin injection has also been observed in hybrid ferromagnetic–semiconductor structures. Here we introduce a different scheme for the ultrafast generation of local magnetic fields in such a hybrid structure. The basis of our approach is to optically pump a Schottky diode with a focused, 150-fs laser pulse. The laser pulse generates a current across the semiconductor–metal junction, which in turn gives rise to an in-plane magnetic field. This scheme combines the localization of current injection techniques with the speed of current generation at a Schottky barrier. Specific advantages include the ability to rapidly create local fields along any in-plane direction anywhere on the sample, the ability to scan the field over many magnetic elements and the ability to tune the magnitude of the field with the diode bias voltage.
Knowledge seeking patterns of care aides in residential care facilities
Creators: name: Gauthier, Renée Lesley
Publisher: name: University of British Columbia
Year: 2018

description: Background: Care aides represent the largest demographic of residential care facility staff, and provide the greatest amount of direct care hours to residents, yet little is known about the knowledge seeking patterns of this group. Understanding the patterns of how, why, when and where care aides seek information to perform their duties is important for employers, policy makers and other stakeholders when designing training programs and planning knowledge sharing strategies. Purpose: To explore the knowledge seeking patterns of care aides who provide care to residents in residential care facilities. Sample/Methods: Semi-structured interviews regarding knowledge seeking patterns in the workplace were conducted with eight care aides employed in three residential care facilities in British Columbia. The interviews were transcribed verbatim and analyzed using the Braun and Clarke method of Thematic Analysis. Key Findings: Five themes were identified: What I Read, What I Hear, What I Already Know, When I Have Time, and Why I Seek. Time constraints and familiarity with residents were overarching concepts throughout the themes. The concept of reporting as knowledge seeking was also revealed, in relation to care aide self-identities as observers and reporters. Implications: Care aides should be encouraged to seek knowledge about residents and their care requirements. Training programs to enhance care aide communication skills and shift self-identity to the role of knowledge seekers are recommended. Dedicated time for knowledge seeking during work hours should be provided to care aides, and practices should be reviewed to optimize care aides consistently receiving accurate information about their residents without delays or obstructions in the communication chain.
Twisted K-homology and group-valued moment maps
Creators: name: Meinrenken, E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: Let G be a compact, simply connected Lie group. We develop a `quantization functor' from pre-quantized quasi-Hamiltonian G-spaces at level k to the fusion ring (Verlinde algebra) R_k(G). The quantization Q(M) is defined as a push-forward in twisted equivariant K-homology. It may be computed by a fixed point formula, similar to the equivariant index theorem for Spin_c-Dirac operators. Using the formula, we calculate Q(M) in several examples.
description: 38 pages
Surfactant induced smooth and symmetric interfaces in Cu/Co multilayers
Creators: name: Amir, S. M.
name: Gupta, Mukul
name: Gupta, Ajay
name: Stahn, J.
name: Wildes, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work we studied Ag surfactant induced growth of Cu/Co multilayers. The Cu/Co multilayers were deposited using Ag surfactant by ion beam sputtering technique. It was found that Ag surfactant balances the asymmetry between the surface free energy of Cu and Co. As a result, the Co-on-Cu and Cu-on-Co interfaces become sharp and symmetric and thereby improve the thermal stability of the multilayer. On the basis of obtained results, a mechanism leading to symmetric and stable interfaces in Cu/Co multilayers is discussed.
description: 7 Pages, 7 Figures
Constraining the ages of the fireballs in the wake of the dIrr galaxy VCC1217 / IC3418
Creators: name: Fumagalli, Mattia
name: Gavazzi, Giuseppe
name: Scaramella, Roberto
name: Franzetti, Paolo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A complex of Halpha emitting blobs with strong FUV excess is associated to the dIrr galaxy VCC1217 / IC3418 (Hester et al. 2010), and extends up to 17 Kpc in the South-East direction. These outstanding features can be morphologically divided into diffuse filaments and compact knots, where most of the star formation activity traced by Halpha takes place. We investigate the properties of the galaxy and the blobs using a multiwavelength approach in order to constrain their origin. We collect publicly available data in UV and Halpha and observe the scene in the optical U,g,r,i bands with LBT. The photometric data allows to evaluate the star formation rate and to perform a SED fitting separately of the galaxy and the blobs in order to constrain their stellar population age. Moreover we analyze the color and luminosity profile of the galaxy and its spectrum to investigate its recent interaction with the Virgo cluster. Our analysis confirms that the most plausible mechanism for the formation of the blobs is ram pressure stripping by the Virgo cluster IGM. The galaxy colors, luminosity profile and SED are consistent with a sudden gas depletion in the last few hundred Myr. The SED fitting of the blobs constrains their ages in < 400 Myr.
description: 10 pages, 11 figures, accepted for publication in Astronomy and Astrophysics
Anisotropic current-induced spin accumulation in the two-dimensional electron gas with spin-orbit coupling
Creators: name: Trushin, Maxim
name: Schliemann, John
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: 530 Physik

description: We investigate the magnetoelectric (or inverse spin-galvanic) effect in the two dimensional electron gases with both Rashba and Dresselhaus spin-orbit coupling using an exact solution of the Boltzmann equation for electron spin and momentum. The spin response to an in-plane electric field turns out to be highly anisotropic while the usual charge conductivity remains isotropic, contrary to earlier statements.
Ramified rectilinear polygons: coordinatization by dendrons
Creators: name: Bandelt, Hans-Jürgen
name: Chepoi, Victor
name: Eppstein, David
Publisher: name: arXiv
Year: 2010
Subjects: subject: Combinatorics (math.CO)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 05C75

description: Simple rectilinear polygons (i.e. rectilinear polygons without holes or cutpoints) can be regarded as finite rectangular cell complexes coordinatized by two finite dendrons. The intrinsic $l_1$-metric is thus inherited from the product of the two finite dendrons via an isometric embedding. The rectangular cell complexes that share this same embedding property are called ramified rectilinear polygons. The links of vertices in these cell complexes may be arbitrary bipartite graphs, in contrast to simple rectilinear polygons where the links of points are either 4-cycles or paths of length at most 3. Ramified rectilinear polygons are particular instances of rectangular complexes obtained from cube-free median graphs, or equivalently simply connected rectangular complexes with triangle-free links. The underlying graphs of finite ramified rectilinear polygons can be recognized among graphs in linear time by a Lexicographic Breadth-First-Search. Whereas the symmetry of a simple rectilinear polygon is very restricted (with automorphism group being a subgroup of the dihedral group $D_4$), ramified rectilinear polygons are universal: every finite group is the automorphism group of some ramified rectilinear polygon.
description: 27 pages, 6 figures
Quantum Phase Transition and Dynamically Enhanced Symmetry in Quadruple Quantum Dot System
Creators: name: Liu, Dong E.
name: Chandrasekharan, Shailesh
name: Baranger, Harold U.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose a system of four quantum dots designed to study the competition between three types of interactions: Heisenberg, Kondo and Ising. We find a rich phase diagram containing two sharp features: a quantum phase transition (QPT) between charge-ordered and charge-liquid phases, and a dramatic resonance in the charge liquid visible in the conductance. The QPT is of the Kosterlitz-Thouless type with a discontinuous jump in the conductance at the transition. We connect the resonance phenomenon with the degeneracy of three levels in the isolated quadruple dot and argue that this leads to a Kondo-like dynamical enhancement of symmetry from U(1) x Z_2 to U(1) x U(1).
description: 4 pages main text + 4 pages supplementary material
Ballistic side jump motion of electrons and holes in semiconductor quantum wells
Creators: name: Schliemann, John
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: 530 Physik

description: We investigate the ballistic motion of electrons and holes in III-V semiconductor quantum wells with spin-orbit coupling and a homogeneous in-plane electric field. As a result of a non-perturbative treatment of both of these influences, particle wave packets undergo a pronounced side jump perpendicular to the field direction. For wave packets of sufficient width the amplitude of this motion can be estimated analytically and increases with decreasing field strength. We discuss the scaling behavior of the effect and some if its experimental implications
Cosmic-ray driven dynamo in galaxies
Creators: name: Hanasz, Michał
name: Wóltański, Dominik
name: Kowalik, Kacper
name: Kotarba, Hanna
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present recent developments of global galactic-scale numerical models of the Cosmic Ray (CR) driven dynamo, which was originally proposed by Parker (1992). We conduct a series of direct CR+MHD numerical simulations of the dynamics of the interstellar medium (ISM), composed of gas, magnetic fields and CR components. We take into account CRs accelerated in randomly distributed supernova (SN) remnants, and assume that SNe deposit small-scale, randomly oriented, dipolar magnetic fields into the ISM. The amplification timescale of the large-scale magnetic field resulting from the CR-driven dynamo is comparable to the galactic rotation period. The process efficiently converts small-scale magnetic fields of SN-remnants into galactic-scale magnetic fields. The resulting magnetic field structure resembles the X-shaped magnetic fields observed in edge-on galaxies.
description: 6 pages, 4 figures, to appear in Proceedings of IAU Symp. 274, Advances in Plasma Astrophysics, ed. A. Bonanno, E. de Gouveia dal Pino and A. Kosovichev
Temperature-dependent chirped coherent phonon dynamics in Bi$_{2}$Te$_{3}$ using high intensity femtosecond laser pulses
Creators: name: Kamaraju, N.
name: Kumar, Sunil
name: Sood, A. K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Degenerate pump-probe reflectivity experiments have been performed on a single crystal of bismuth telluride (Bi$_2$Te$_3$) as a function of sample temperature (3K to 296K) and pump intensity using $\sim$ 50 femtosecond laser pulses with central photon energy of 1.57 eV. The time resolved reflectivity data show two coherently generated totally symmetric A$_{1g}$ modes at 1.85 THz and 3.6 THz at 296K which blue shift to 1.9 THz and 4.02 THz, respectively at 3K. At high photoexcited carrier density of $\sim$ 1.7 $\times$ 10$^{21}$cm$^{-3}$, the phonon mode at 4.02 THz is two orders of magnitude higher positively chirped (i.e the phonon time period decreases with increasing delay time between the pump and the probe pulses) than the lower frequency mode at 1.9 THz. The chirp parameter, $β$ is shown to be inversely varying with temperature. The time evolution of these modes is studied using continuous wavelet transform of the time-resolved reflectivity data.
description: 14 pages, 5 figures
Phase-resolved pulsed precessional motion at a Schottky barrier
Creators: name: Buess, Matthias
name: Knowles, T.
name: Ramsperger, U.
name: Pescia, D.
name: Back, C. H.
Publisher: name: Universität Regensburg
Year: 2004
Subjects: subject: 530 Physik

description: The precessional motion of the magnetization is excited by an ultrashort magnetic-field pulse at a Schottky barrier containing a ferromagnetic film. The precessional frequency, measured as a function of a bias field of variable strength and direction by time resolved Kerr microscopy, is accurately reproduced by a model based on the theory of ferromagnetic resonance. The spatially resolved precessional phase reveals a jump related to the chiral character of the exciting magnetic-field pulse.
A Spin-Isospin Dependent 3N Scattering Formalism in a 3D Faddeev Scheme
Creators: name: Harzchi, M.
name: Bayegan, S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We have introduced a spin-isospin dependent three-dimensional approach for formulation of the three-nucleon scattering. Faddeev equation is expressed in terms of vector Jacobi momenta and spin-isospin quantum numbers of each nucleon. Our formalism is based on connecting the transition amplitude $T$ to momentum-helicity representations of the two-body $t$-matrix and the deuteron wave function. Finally the expressions for nucleon-deuteron elastic scattering and full breakup process amplitudes are presented.
description: 17 pages
Über die Einhegung von Race in Ethnizität. Eine feministische Intervention
On the containment of race in ethnicity. A feminist intervention
Creators: name: Löw, Martina
Publisher: name: Springer Science and Business Media LLC
Year: 2023
Subjects: subject: 300 Sozialwissenschaften::300 Sozialwissenschaften, Soziologie::301 Soziologie, Anthropologie
subject: race
subject: Ethnizität
subject: Rassismus
subject: Geschlecht
subject: doing race
subject: doing Geschlecht
subject: ethnicity
subject: racism
subject: gender

description: In seinem Beitrag „Immer Ärger mit ,Race‘. Eine Agenda für den Umgang mit einer heiklen Kategorie“ schlägt Loïc Wacquant vor, Race als einen „paradoxen Subtyp von Ethnizität“ zu behandeln. Damit wirft er die wichtige Frage nach dem theoretischen Stellenwert dieser substanzlosen Kategorie sowie der Theoriearchitektur auf, in deren Rahmen sich Probleme von Rassismus thematisieren lassen. Dennoch folgt der Kommentar der Annahme, dass der Preis, den wir für die Einhegung von Race im Feld der Ethnizität zahlen, zu hoch ist: erstens, weil dabei Klasse und Geschlecht substanzialisiert werden, und zweitens, weil die Subsumierung von Race unter Ethnizität so reibungslos plausibel dann doch nicht ist. Dagegen wird vorgeschlagen, Race und Geschlecht als Konzepte zur Beobachtung (und zwar ausschließlich um doing race und doing Geschlecht zu verstehen) engzuführen, insofern beide Konstruktionen auf körperlichen Einschreibungen basieren und somit von dem Konstruktionsmodus der Klasse und der Ethnizität unterscheidbar sind.
description: In his article “Resolving the trouble with ‘race’”, Loïc Wacquant suggests treating race as a “paradoxical subtype of ethnicity.” In doing so, he raises the important question of the theoretical status of this insubstantial category as well as of the theoretical architecture within which problems of racism can be addressed. Nevertheless, the commentary follows the assumption that the price that we pay for the containment of race in the field of ethnicity is too high: first, because class and gender are thereby substantialized, and second, because the subsumption of race under ethnicity is not quite so plausible after all. As an alternative, it is suggested that race and gender should be narrowly defined purely as concepts for observation (exclusively in order to understand doing race and doing gender), insofar as both constructions are based on bodily inscriptions and are thus distinguishable from the construction mode of class and ethnicity.
Magnetic Spatial Non-Uniformities on the Picosecond Timescale
Creators: name: Acremann, Y.
name: Kashuba, A.
name: Buess, Matthias
name: Pescia, D.
name: Back, Christian
Publisher: name: Universität Regensburg
Year: 2002
Subjects: subject: Ferromagnetic resonance; Scanning kerr microscopy
subject: 530 Physik

description: The magnetization of a Co disk with an in-plane flux-closure domain structure was subject to a picosecond magnetic field pulse perpendicular to the plane. Images with sub-micron spatial resolution have been recorded every 10 ps which reveal magnetic non-uniformities of the ferromagnetic resonance (FMR) response. A detailed analysis of the images shows a difference in the FMR frequencies of about 10% as a function of radius. In addition, the magnetization at the edge responds earlier to the applied field pulse. We discuss possible origins of these phenomena.
Observational Tests of the Properties of Turbulence in the Very Local Interstellar Medium
Creators: name: Spangler, Steven R.
name: Savage, Allison H.
name: Redfield, Seth
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The Very Local Interstellar Medium (VLISM) contains clouds which consist of partially-ionized plasma. These clouds can be effectively diagnosed via high resolution optical and ultraviolet spectroscopy of the absorption lines they form in the spectra of nearby stars. Among the information provided by these spectroscopic measurements are the root-mean-square velocity fluctuation due to turbulence in these clouds and the ion temperature, which may be partially determined by dissipation of turbulence. We consider whether this turbulence resembles the extensively studied and well-diagnosed turbulence in the solar wind and solar corona. Published observations are used to determine if the velocity fluctuations are primarily transverse to a large-scale magnetic field, whether the temperature perpendicular to the large scale field is larger than that parallel to the field, and whether ions with larger Larmor radii have higher temperatures than smaller gyroradius ions. Although a thorough investigation of the data is underway, a preliminary examination of the published data shows neither evidence for anisotropy of the velocity fluctuations or temperature, nor Larmor radius-dependent heating. These results indicate differences between solar wind and Local Cloud turbulence.
description: Paper submitted to Nonlinear Processes in Geophysics