cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Problems of Astrophysical Turbulent Convection: Thermal convection in a layer without boundaries
Creators: name: Simitev, R. D.
name: Busse, F. H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Thermal convection in fluid layers heated from below are usually realized experimentally as well as treated theoretically with fixed boundaries on which conditions for the temperature and the velocity field are prescribed. The thermal and velocity boundary layers attached to the upper and lower boundaries determine to a large extent the properties of turbulent convection at high Rayleigh numbers. Fixed boundaries are often absent in natural realizations of thermal convection. This paper studies the properties of convection driven by a planar heat source below a cooling source of equal size immersed in an otherwise stably stratified fluid layer are studied in this paper. Unavoidable boundaries do not influence the convection flow since they are separated from the active convection layer by nearly motionless stably stratified regions. The onset of convection occurs in an inner unstably stratified region where the mean temperature gradient is reversed. But the region of a reversed horizontally averaged temperature gradient disappears at higher amplitudes of convection such that the vertical derivative of the mean temperature no longer changes its sign.
description: http://www.stanford.edu/group/ctr/Summer/SP10/index.html
muSR investigation of magnetism and magnetoelectric coupling in Cu2OSeO3
Creators: name: Maisuradze, A.
name: Guguchia, Z.
name: Graneli, B.
name: Ronnow, H. M.
name: Berger, H.
name: Keller, H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A detailed zero and transverse field (ZF&TF) muon spin rotation (muSR) investigation of magnetism and the magneto-electric coupling in Cu2OSeO3 is reported. An internal magnetic field B_int(T=0) = 85.37(25) mT was found, in agreement with a ferrimagnetic state below Tc = 57.0(1) K. The temperature dependence of the magnetic order parameter is well described by the relation B_int = B(0)(1-(T/Tc)^2)^b with an effective exponent b = 0.39(1) which is close to the critical exponent B ~ 1/3 for a three dimensional (3D) magnetic system. Just above Tc the muon relaxation rate follows the power low λ(T)\propto (T/Tc - 1)^ωwith ω= 1.06(9), which is characteristic for 3D ferromagnets. Measurements of B_int(T) with and without an applied electrostatic field E = 1.66 x 10^5 V/m suggest a possible electric field effect of magnitude ΔBv = Bv(0 V)-Bv(500 V) = - 0.4(4) mT.
description: 7 pages, 5 figures
Structural, electronic, and magnetic properties of CrTe2
Creators: name: Liu, Yuhang
name: Kwon, Sohee
name: de Coster, George J.
name: Lake, Roger K.
name: Neupane, Mahesh R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Two-dimensional chromium ditelluride (CrTe2) is a promising ferromagnetic layered material that exhibits long-range ferromagnetic ordering in the monolayer limit. The formation energies of the different possible structural phases (1T, 1H, 2H) calculated from density functional theory (DFT) show that the 1T phase is the ground state, and the energetic transition barriers between the phases, calculated by the nudged elastic band method, are large, on the order of 0.5 eV. The self-consistent Hubbard $U$ correction parameters are calculated for all the phases of CrTe$_2$. The calculated magnetic moment of 1T-CrTe$_2$ with $\geq 2$ layers lies in the plane, whereas the magnetic moment of a monolayer is out-of-plane. Band filling and tensile bi-axial strain cause the magnetic moment of a monolayer to switch from out-of-plane to in-plane, and compressive bi-axial strain in a bilayer causes the magnetic moment to switch from in-plane to out-of-plane. The magnetic anisotropy is shown to originate from the large spin orbit coupling (SOC) of the Te atoms and the anisotropy of the exchange coupling constants $J_{xy}$ and $J_z$ in an XXZ type Hamiltonian. Renormalized spin wave theory using experimental values for the magnetic anisotropy energy and Curie temperatures provides a range of values for the nearest neighbor exchange coupling.
Prognostic significance of DNA cytometry in cutaneous malignant lymphomas.
Creators: name: Vogt, Thomas
name: Stolz, Wilhelm
name: Braun-Falco, Otto
name: Kaudewitz, Peter
name: Eckert, Fritjof
name: Abmayr, Wolfgang
name: Dummer, Reinhard
name: Burg, Günter
Publisher: name: Universität Regensburg
Year: 1991
Subjects: subject: 610 Medizin
subject: Adult
subject: Aged
subject: DNA, Neoplasm/analysis
subject: Female
subject: Flow Cytometry
subject: Humans
subject: Image Processing, Computer-Assisted
subject: Lymphoma, Non-Hodgkin/mortality
subject: Male
subject: Middle Aged
subject: Prognosis
subject: Skin Neoplasms/mortality

description: The current classification of cutaneous malignant lymphomas (ML) into low-grade and high-grade lymphomas was found to be of limited reproducibility and permitted only a rough prediction about outcome. With this in mind, the relationship between nuclear DNA content and both prognosis and histologic grading according to the Kiel classification was evaluated on Feulgen-stained imprint specimens. In all, 49 cases of malignant non-Hodgkin's lymphoma, primary of the skin or with an involvement of the skin as one of the first symptoms, were studied using a computerized high-resolution image analysis system. The 2c deviation index (2cDI), which reflects the variation of the nuclear DNA values around the normal diploid peak, was found to be the best prognostically relevant criterion. Using the 2cDI, a significant discrimination (P less than 0.001 in the U test) between low-grade and high-grade ML was achieved. The prognostic benefit of the 2cDI was well documented by a significant inverse correlation between the 2cDI and the period of time until the patients progressed at least into one higher stage or died of lymphoma (r equals -0.63, P less than 0.05). In addition, the 2cDI enabled prognosis of the course of disease. In the group with low 2cDI values (2cDI, less than 0.5), no progression of the disease was observed after 1 year. In the groups presenting with a 2cDI between 0.5 and 1.0 and higher than 1.0, a progression was found in 57% and 64% of the cases studied, respectively. In conclusion, these measurements indicate that the determination of DNA distribution patterns in imprint specimens allows a precise and objective prognostic evaluation of cutaneous ML.
High-spectral-resolution absorption measurements with free-electron lasers using ghost spectroscopy
Creators: name: Klein, Yishai
name: Strizhevsky, Edward
name: Capotondi, Flavio
name: De Angelis, Dario
name: Giannessi, Luca
name: Pancaldi, Matteo
name: Pedersoli, Emanuele
name: Penco, Giuseppe
name: Prince, Kevin C.
name: Sefi, Or
name: Kim, Young Yong
name: Vartaniants, Ivan
name: Shwartz, Sharon
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2023
Subjects: subject: 530

description: We demonstrate a simple and robust high-resolution ghost spectroscopy approach for x-ray and extreme ultraviolet transient absorption spectroscopy at free-electron laser sources. To retrieve the sample response, our approach requires only an online spectrometer before the sample and a downstream bucket detector. We validate the method by measuring the absorption spectrum of silicon, silicon carbide, and silicon nitride membranes in the vicinity of the silicon L2,3 edge and by comparing the results with standard techniques for absorption measurements. Moreover, we show that ghost spectroscopy allows the high-resolution reconstruction of the sample spectral response to optical pumps using a coarse energy scan with self-amplified spontaneous emission radiation.
Revision of the Festuca marginata “group” (Festuca sect. Festuca, Poaceae) in Southern Europe, with special reference to France, Italy and Greece
Creators: name: Ardenghi, Nicola Maria Giuseppe
name: Šmarda, Petr
name: Calbi, Mariasole
name: Coppi, Andrea
name: Lastrucci, Lorenzo
name: Lazzaro, Lorenzo
name: Mugnai, Michele
name: Quercioli, Claudia
name: Rossi, Graziano
name: Foggi, Bruno
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified
subject: Marine Biology
subject: Plant Biology

description: The Festuca marginata group includes several taxa of glaucous, thick-leaved fescues with three sclerenchyma strands, first described by Hackel as Festuca ovina subsp. laevis, which are common in the Euro-Mediterranean area. Ten different taxa (species and subspecies) are currently recognized in this group. Nevertheless, taxonomical works typically have only a local (mostly national) scope, and the recognized taxa show only few or negligible morphological differences, making their separate taxonomic status doubtful. Here we provide morphological, karyological, and genetic analysis (ISSR, flow cytometry) of the Festuca marginata group based on populations in a larger geographical scale including Central and Southern-Eastern Europe. We found that most of the local taxa are difficult to definitively distinguish and we suggest the whole group be treated as a single species, Festuca marginata, with two subspecies reflecting major differences in morphology and genome size between the Greece subsp. heldreichii and the remaining European populations, referred to as subsp. marginata.
Απομάκρυνση χρωμάτων από φυσικά νερά και υγρά απόβλητα με τη χρήση φυσικών προσροφητικών
Creators: name: Τσούτσα, Ελευθερία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Φυσικά προσροφητικά
Χρώματα
Απόβλητα
Natural adsorbents
Dyes
Wastewaters

description: O σκοπός της παρούσας μεταπτυχιακή διπλωματική εργασίας ήταν η μελέτη της προσρόφησης των χρωμάτων από υδατικά συστήματα με χρήση διαφόρων φυσικών προσροφητικών υλικών. Τα φυσικά προσροφητικά που παρήχθησαν ήταν από φλούδες μπανάνας, πορτοκαλιού και ροδιού. Τα νέα προσροφητικά που παρασκευάστηκαν, μελετήθηκαν για την προσρόφηση των χρωστικών Reactive Black 5, Reactive Red 120, Methylene Blue και Remazol Brilliant Blue Reactive. Προσδιορίστηκαν οι βέλτιστες συνθήκες (pH, δόση), μελετήθηκε η κινητική των αντιδράσεων προσρόφησης, οι μελέτες ισορροπίας, η θερμοδυναμική μελέτη καθώς και η αναγέννηση των υλικών αυτών. Τέλος τα φυσικά προσροφητικά μελετήθηκαν περεταίρω για την ταυτόχρονη απομάκρυνση των χρωστικών από το μείγμα τους.
description: The aim of this master's thesis was to study the adsorption of dyes from aqueous systems using various natural adsorbent materials. The natural adsorbents produced were from banana, orange, and pomegranate peels. The newly prepared adsorbents were studied for the removal of Reactive Black 5, Reactive Red 120, Methylene Blue, and Remazol Brilliant Blue Reactive dyes. The optimal conditions (pH, dosage) were determined, and the kinetics of the adsorption reactions, equilibrium and thermodynamics studies, as well as the regeneration of these materials were investigated. Finally, the natural adsorbents were further studied for the simultaneous removal of dyes from their mixture.
Sage (Salvia macrochlamys): LC-HRMS for phytochemical analysis, cytotoxicity, enzyme inhibition, antioxidant activity, molecular docking and molecular dynamics simulations
Creators: name: Kızıltaş, Hatice
name: Ortaakarsu, Ahmet Buğra
name: Bingöl, Zeynebe
name: Gören, Ahmet Ceyhan
name: Pınar, Süleyman Mesut
name: Gülçin, İlhami
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biochemistry
subject: Medicine
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified

description: This study primarily aims to evaluate the phenolic content and biological activity of Salvia macrochlamys both in vitro and in silico. The antioxidant activities of Salvia macrochlamys were assessed using various methods. Additionally, cytotoxic effects and the α-amylase, α-glucosidase, and acetylcholinesterase (AChE) enzyme inhibitory abilities of ethanolic extract of the aerial parts of Salvia macrochlamys (EESM) were evaluated. Then, the molecular docking interactions and molecular dynamic calculations of EESM against α-amylase, α-glycosidase, and AChE enzymes were carried out. High antioxidant activity was determined in both ethanol and water extracts. The IC50 values of EESM against AChE (EC 3.1.1.7), α-glycosidase (E.C.3.2.1.20), and α-amylase (E.C.3.2.1.1) were determined as 1.622 μg/mL, 0.530 μg/mL, and 1.320 μg/mL, respectively. High enzyme-inhibiting properties of EESM were determined in also in silico. Rosmarinic acid was identified as one of the most abundant phenolic compounds in both EESM and water extract of the aerial parts of Salvia macrochlamys (WESM) (3919.65 mg/kg and 10520.77 mg/kg, respectively). Their high level of flavonoids and phenolics, as well as the potent antioxidant and enzyme-inhibitory properties displayed by extracts, may contribute to broadening the use of Salvia macrochlamys in both traditional and modern therapeutic applications.
Composing journeys : understanding the lived experiences of saudi arabia’s female early childhood educators
Creators: name: Alrasheed, Balsam
Publisher: name: University of British Columbia
Year: 2018

description: Within the country of Saudi Arabia, all early childhood education (ECE) teachers in both public and private schools are female. Despite this demographic fact, there has been little academic study into their professional journeys, challenges, and ambitions. This study brings the voices of these women forward. Through the methodological technique of “portrait” based narrative inquiry inspired by cultural anthropologist Mary Catherine Bateson, and building on the framework of Urie Bronfenbrenner's ecological systems theory, this study explores how six female educators working in Saudi Arabia's ECE have entered the field and negotiated their professional journeys throughout the years. In this study I argue that the narratives composed from the six women I interviewed illustrate the complexities and contradictions that underpin Saudi Arabian ECE. The study reveals the overwhelming influence of patriarchal norms, policies, and practices in Saudi Arabia and how they intersect to shape the capacity of women educators to bring about social change, as well as a restating of what it means to be a Saudi Arabian citizen, as daughters, siblings, wives, mothers, and educators. These narratives challenge the perception of Saudi Arabian ECE as an environment filled with apathetic teachers who are completely dominated by patriarchal systems and unable or unwilling to engage productively in discussions of reform. At the same time, these narratives offer a window into the world of subordinated women and the marginalization of their pedagogical thought, particularly in an educational system that is frequently trapped in centralized policies and where professional opportunity and upward mobility for women are often limited. The implications of these findings for our understanding of the prospects and contributions of ECE in Saudi Arabia are subsequently examined.
Ionizing wave via high-power HF acceleration
Creators: name: Mishin, Evgeny
name: Pedersen, Todd
Publisher: name: arXiv
Year: 2010
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Recent ionospheric modification experiments with the 3.6 MW transmitter at the High Frequency Active Auroral Research Program (HAARP) facility in Alaska led to discovery of artificial ionization descending from the nominal interaction altitude in the background F-region ionosphere by ~60 km. This paper presents a physical model of an ionizing wavefront created by suprathermal electrons accelerated by the HF-excited plasma turbulence.
Ueber ein Meteoreisen von Mukerop, Bezirk Gibeon, Grossnamaland
Creators: name: Brezina, Aristides
name: Cohen, Emil
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 58, 1902
Beiträge zur Schneckenfauna des Steinheimer Obermiocäns
Creators: name: Jooß, Carlo H.
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 58, 1902
Necessary conditions for microscopic many-body theories
Creators: name: Jackson, A. D.
name: Wettig, Tilo
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 530 Physik

description: Familiar necessary conditions for the saturation of many-body binding energies are reconsidered in order to provide a better understanding of the analyticity properties of the ground state energy and of the convergence properties of certain sums of Goldstone diagrams. Using these results and other elementary arguments, we identify a minimum class of diagrams which must be summed to all orders if the perturbative treatment of other diagrams is to converge.
TAPE: Temporal Attention-based Probabilistic human pose and shape Estimation
Creators: name: Vasilikopoulos, Nikolaos
name: Kolotouros, Nikos
name: Tsoli, Aggeliki
name: Argyros, Antonis
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Reconstructing 3D human pose and shape from monocular videos is a well-studied but challenging problem. Common challenges include occlusions, the inherent ambiguities in the 2D to 3D mapping and the computational complexity of video processing. Existing methods ignore the ambiguities of the reconstruction and provide a single deterministic estimate for the 3D pose. In order to address these issues, we present a Temporal Attention based Probabilistic human pose and shape Estimation method (TAPE) that operates on an RGB video. More specifically, we propose to use a neural network to encode video frames to temporal features using an attention-based neural network. Given these features, we output a per-frame but temporally-informed probability distribution for the human pose using Normalizing Flows. We show that TAPE outperforms state-of-the-art methods in standard benchmarks and serves as an effective video-based prior for optimization-based human pose and shape estimation. Code is available at: https: //github.com/nikosvasilik/TAPE
description: Scandinavian Conference on Image Analysis (SCIA) 2023
Ueber das Vorkommen der Mauereidechse an dem Kriegsberg in Stuttgart
Creators: name: Schweizerbarth-Roth, Elise Melitta von
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 58, 1902
Simulations of decomposition kinetics of Fe-Cr solid solutions during thermal aging
Creators: name: Martinez, E.
name: Fu, C. -C.
name: Levesque, M.
name: Nastar, M.
name: Soisson, F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The decomposition of Fe-Cr solid solutions during thermal aging is modeled by Atomistic Kinetic Monte Carlo (AKMC) simulations, using a rigid lattice approximation with composition dependant pair interactions that can reproduce the change of sign of the mixing energy with the alloy composition. The interactions are fitted on ab initio mixing energies and on the experimental phase diagram, as well as on the migration barriers in iron and chromium rich phases. Simulated kinetics is compared with 3D atom probe and neutron scattering experiments.
description: 6 pages, 5 figures, PTM 2010
Examining European Press Coverage of the Covid-19 No-Vax Movement: An NLP Framework
Creators: name: del Barrio, David Alonso
name: Gatica-Perez, Daniel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: This paper examines how the European press dealt with the no-vax reactions against the Covid-19 vaccine and the dis- and misinformation associated with this movement. Using a curated dataset of 1786 articles from 19 European newspapers on the anti-vaccine movement over a period of 22 months in 2020-2021, we used Natural Language Processing techniques including topic modeling, sentiment analysis, semantic relationship with word embeddings, political analysis, named entity recognition, and semantic networks, to understand the specific role of the European traditional press in the disinformation ecosystem. The results of this multi-angle analysis demonstrate that the European well-established press actively opposed a variety of hoaxes mainly spread on social media, and was critical of the anti-vax trend, regardless of the political orientation of the newspaper. This confirms the relevance of studying the role of high-quality press in the disinformation ecosystem.
Magneto-gyrotropic photogalvanic effect and spin dephasing in (110)-grown GaAs/AlGaAs quantum well structures
Creators: name: Olbrich, Peter
name: Allerdings, Jurie
name: Belkov, Vassilij
name: Tarasenko, Sergey
name: Schuh, Dieter
name: Wegscheider, Werner
name: Korn, Tobias
name: Schüller, Christian
name: Weiss, Dieter
name: Ganichev, Sergey
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 73.21.Fg, 72.25.Fe, 78.67.De, 73.63.Hs

description: We report the magnetogyrotropic photogalvanic effect(MPGE)in n-doped (110)-grown GaAs/AlGaAs quantum-well (QW) structures caused by free-carrier absorption of terahertz radiation in the presence of a magnetic field. The photocurrent behavior upon variation in the radiation-polarization state, magnetic field orientation, and temperature is studied. The developed theory of MPGE describes well all experimental results. It is demonstrated that the structure inversion asymmetry can be controllably tuned to zero by variation in the delta-doping layer positions. For the in-plane magnetic ield the photocurrent is only observed in asymmetric structures but vanishes in symmetrically doped QWs. Applying time-resolved Kerr rotation and polarized luminescence we investigate the spin relaxation in QWs for various excitation levels. Our data confirm that in symmetrically doped QWs the spin-relaxation time is maximal; therefore, these structures set the upper limit of spin dephasing in GaAs/AlGaAs QWs.
Seed morphological variation in four closely related Linaria species (Plantaginaceae) endemic to the Tyrrhenian area
Creators: name: Sarigu, M.
name: Ucchesu, M.
name: Carta, A.
name: Peruzzi, L.
name: Bacchetta, G.
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Seed features are a useful and relevant source of taxonomic information, especially when evaluated based on morphometric and micromorphological approaches. Here, we studied 21 populations from four out of the five species of the Mediterranean Linaria purpurea group (Plantaginaceae). Linaria capraria (endemic to Tuscan Archipelago) and L. cossonii (endemic to Sardinia and Tunisia) are easily recognizable based on overall morphometry and SEM analysis, respectively. On the contrary, L. arcusangeli (endemic to southern Sardinia) and L. purpurea (endemic to peninsular Italy and Sicily) show very similar seeds, whose features do not guarantee a reliable identification, although these two species are otherwise well distinct for their habit and flower features. Accordingly, by integrating all the available information, all four species are well supported on morphological grounds.
Ueber das Vorkommen des Apus cancriformis SCHÄFFER in Württemberg
Creators: name: Klunzinger, Carl Benjamin
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 58, 1902
Aggregate Interference Modeling in Cognitive Radio Networks with Power and Contention Control
Creators: name: Chen, Zengmao
name: Wang, Cheng-Xiang
name: Hong, Xuemin
name: Thompson, John
name: Vorobyov, Sergiy A.
name: Ge, Xiaohu
name: Xiao, Hailin
name: Zhao, Feng
Publisher: name: arXiv
Year: 2010
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we present an interference model for cognitive radio (CR) networks employing power control, contention control or hybrid power/contention control schemes. For the first case, a power control scheme is proposed to govern the transmission power of a CR node. For the second one, a contention control scheme at the media access control (MAC) layer, based on carrier sense multiple access with collision avoidance (CSMA/CA), is proposed to coordinate the operation of CR nodes with transmission requests. The probability density functions of the interference received at a primary receiver from a CR network are first derived numerically for these two cases. For the hybrid case, where power and contention controls are jointly adopted by a CR node to govern its transmission, the interference is analyzed and compared with that of the first two schemes by simulations. Then, the interference distributions under the first two control schemes are fitted by log-normal distributions with greatly reduced complexity. Moreover, the effect of a hidden primary receiver on the interference experienced at the receiver is investigated. It is demonstrated that both power and contention controls are effective approaches to alleviate the interference caused by CR networks. Some in-depth analysis of the impact of key parameters on the interference of CR networks is given via numerical studies as well.
description: 24 pages, 8 figures, submitted to IEEE Trans. Communications in July 2010
Über die physikalsichen, chemischen und biologischen Ursachen der Farbe unserer Gewässer: Nachtrag
Creators: name: Klunzinger, Carl Benjamin
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 58, 1902
Über parasitische Fliegenmaden an einer Kröte
Creators: name: Klunzinger, Carl Benjamin
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 58, 1902
Prevalence of different double ionization pathways and traces of three-body collisions in strongly driven Helium
Creators: name: Emmanouilidou, Agapi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present a unified treatment of the prevalence of different double ionization (DI) pathways as a function of the sum of the final electron energies in strongly driven Helium. We do so as a function of laser frequency and intensity. At small total energy a new DI pathway prevails where both electrons are ionized with a delay after re-collision. We find that three-body collisions between the two electrons and the nucleus underly this pathway--we refer to it as triple collision (TC) pathway. At high total energy the pathway that prevails is the one where one electron is ionized with a delay following re-collision---we refer to it as Delayed pathway. Asymptotic observables that trace the prevalence of the latter pathways are identified.
Extreme Covariant Quantum Observables in the Case of an Abelian Symmetry Group and a Transitive Value Space
Creators: name: Haapasalo, Erkka
name: Pellonpää, Juha-Pekka
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We represent quantum observables as POVMs (normalized positive operator valued measures) and consider convex sets of observables which are covariant with respect to a unitary representation of a locally compact Abelian symmetry group $G$. The value space of such observables is a transitive $G$-space. We characterize the extreme points of covariant observables and also determine the covariant extreme points of the larger set of all quantum observables. The results are applied to position, position difference and time observables.
description: 23 pages
In situ magnetoresistance measurements of ferromagnetic nanocontacts in the Lorentz transmission electron microscope
Creators: name: Haug, Thomas
name: Perzlmaier, Korbinian
name: Back, Christian
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: ferromagnetic materials, magnetic hysteresis, magnetoresistance, micromagnetics, nanocontacts, nanostructured materials, Permalloy, transmission electron microscopy
subject: 530 Physik
subject: 68.37.Lp; 75.47.-m; 75.60.Ch; 75.70.Kw

description: We report on in situ magnetoresistance measurements of a 30-nm-wide ferromagnetic nanocontact with simultaneous magnetic imaging in the Lorentz transmission electron microscope. The magnetoresistive measurements are correlated with the micromagnetic configuration of the sample. This allows us to assign characteristic features in the magnetoresistance curves to different magnetic configurations of the sample. From our experiments we can conclude that the micromagnetic configuration of the whole sample—not only the nanocontact region—has to be taken into account for the interpretation of magnetoresistive effects or hysteresis loops. Micromagnetic simulations were performed which confirm the experimental results.
Comparative study of different hexane extracts from Algerian Artemisia absinthium and Artemisia herba-alba: GC-MS profile, artemisinin content, and antioxidant properties
Creators: name: Belyagoubi-Benhammou, Nabila
name: Zitouni-Nourine, Saida Hanane
name: Belyagoubi, Larbi
name: Kebiri, Hadjer
name: Tahar, Sadié Oumar
name: Di Marco, Gabriele
name: D’Agostino, Alessia
name: Canini, Antonella
name: Gismondi, Angelo
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biochemistry
subject: Medicine
subject: Molecular Biology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Plant Biology

description: The genus Artemisia belongs to the Asteraceae family, known for its many pharmacological properties. This study focuses on the chemical characterization of two Algerian species: Artemisia absinthium (AA) and Artemisia herba-alba (AHA). Samples from eight different stations were subjected to four extraction procedures using hexane as solvent: maceration, reflux, Soxhlet, and ultrasound. After determining the yield, total phenolics were quantified in the 32 samples. In addition, the antioxidant activity of the extracts was evaluated by three tests (i.e. TAC, DPPH, and β-Carotene assays). The results showed that the reflux method was able to isolate low levels of phenols but presented a better antioxidant activity, compared to the other extraction protocols. Regarding the two plant species, A. absinthium revealed a higher antioxidant power. GC–MS analysis led us to identify a total of 68 chemical constituents from all hexane samples of the two species. Extracts were mainly dominated by fatty acids (FAs), monoterpenoids and sesquiterpenoids, without any significant variability based on the applied method. HPLC-DAD analysis proved that the highest content in artemisinin was present in A. absinthium extracts obtained by Soxhlet, with an amount estimated at 15.09 ± 0.62 µg per mg of plant material, followed by ultrasound extraction.
Bericht der Erdbeben-Kommission die vom 1. März 1901 bis 1. März 1902 in Württemberg und Hohenzollern beobachteten Erdbeben
Creators: name: Schmidt, August
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 58, 1902
Electron spin relaxation in paramagnetic Ga(Mn)As quantum wells
Creators: name: Jiang, J. H.
name: Zhou, Y.
name: Korn, Tobias
name: Schüller, Christian
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: electron spin-lattice relaxation, electron-phonon interactions, gallium compounds, III-V semiconductors, impurity states, interstitials, magnetic impurities, manganese, paramagnetism, semiconductor doping, semiconductor quantum wells, semimagnetic semiconductors
subject: 530 Physik
subject: 72.25.Rb; 75.50.Pp; 71.10.-w; 71.70.Ej

description: Electron spin relaxation in paramagnetic Ga(Mn)As quantum wells is studied via the fully microscopic kinetic spin Bloch equation approach where all the scatterings, such as the electron-impurity, electron-phonon, electron-electron Coulomb, electron-hole Coulomb, electron-hole exchange (the Bir-Aronov-Pikus mechanism) and the s-d exchange scatterings, are explicitly included. The Elliott-Yafet mechanism is also incorporated. From this approach, we study the spin relaxation in both n-type and p-type Ga(Mn)As quantum wells. For n-type Ga(Mn)As quantum wells, where most Mn ions take the interstitial positions, we find that the spin relaxation is always dominated by the D'yakonov-Perel' (DP) mechanism in the metallic region. Interestingly, the Mn concentration dependence of the spin relaxation time is nonmonotonic and exhibits a peak. This is due to the fact that the momentum scattering and the inhomogeneous broadening have different density dependences in the nondegenerate and degenerate regimes. For p-type Ga(Mn)As quantum wells, we find that the Mn concentration dependence of the spin relaxation time is also nonmonotonic and shows a peak. The cause of this behavior is that the s-d exchange scattering (or the Bir-Aronov-Pikus) mechanism dominates the spin relaxation in the high Mn concentration regime at low (or high) temperature, whereas the DP mechanism determines the spin relaxation in the low Mn concentration regime. The Elliott-Yafet mechanism also contributes to the spin relaxation at intermediate temperatures. The spin relaxation time due to the DP mechanism increases with increasing Mn concentration due to motional narrowing, whereas those due to the spin-flip mechanisms decrease with it, which thus leads to the formation of the peak. The temperature, photoexcitation density, and magnetic field dependences of the spin relaxation time in p-type Ga(Mn)As quantum wells are investigated systematically with the underlying physics revealed. Our results are consistent with the recent experimental findings.
ShipHullGAN: A generic parametric modeller for ship hull design using deep convolutional generative model
Creators: name: Khan, Shahroz
name: Goucher-Lambert, Kosa
name: Kostas, Konstantinos
name: Kaklis, Panagiotis
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this work, we introduce ShipHullGAN, a generic parametric modeller built using deep convolutional generative adversarial networks (GANs) for the versatile representation and generation of ship hulls. At a high level, the new model intends to address the current conservatism in the parametric ship design paradigm, where parametric modellers can only handle a particular ship type. We trained ShipHullGAN on a large dataset of 52,591 \textit{physically validated} designs from a wide range of existing ship types, including container ships, tankers, bulk carriers, tugboats, and crew supply vessels. We developed a new shape extraction and representation strategy to convert all training designs into a common geometric representation of the same resolution, as typically GANs can only accept vectors of fixed dimension as input. A space-filling layer is placed right after the generator component to ensure that the trained generator can cover all design classes. During training, designs are provided in the form of a shape-signature tensor (SST) which harnesses the compact geometric representation using geometric moments that further enable the inexpensive incorporation of physics-informed elements in ship design. We have shown through extensive comparative studies and optimisation cases that ShipHullGAN can generate designs with augmented features resulting in versatile design spaces that produce traditional and novel designs with geometrically valid and practically feasible shapes.
Bericht der Kommission für die pflanzengeographische Durchforschung Württembergs und Hohenzollerns
Creators: name: Gradmann, Robert
name: Eichler, Julius
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 58, 1902
Microstrip line ferromagnetic resonance and Brillouin light scattering investigations of magnetic properties of Co2MnGe Heusler thin films
Creators: name: Belmeguenai, M.
name: Zighem, F.
name: Roussigné, Y.
name: Chérif, S.-M.
name: Moch, P.
name: Westerholt, K.
name: Woltersdorf, Georg
name: Bayreuther, Günther
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: Brillouin spectra, cobalt alloys, crystal symmetry, ferromagnetic materials, ferromagnetic resonance, germanium alloys, magnetic anisotropy, magnetic thin films, magnetisation, magneto-optical effects, manganese alloys, metallic thin films, spin waves, sputtered coatings
subject: 530 Physik
subject: 76.50.+g; 78.35.+c; 75.30.Gw; 75.40.Gb

description: Co2MnGe films of different thicknesses (34, 55, and 83 nm) were grown by rf sputtering at 400 °C on single-crystal Al2O3 corundum substrates showing an in-plane c axis. Their dynamic magnetic properties were studied using conventional and microstrip line (MS) ferromagnetic resonances (FMRs), as well as Brillouin light scattering (BLS) techniques. The effective magnetizations and gyromagnetic factors are first deduced from the resonance spectra involving the uniform magnetic mode under in-plane and out-of-plane magnetic applied fields. The angular dependence of the frequency, measured under a weak in-plane magnetic applied field, then allows deriving of the parameters describing the in-plane magnetic anisotropy. In the 34- and 55-nm-thick films, its behavior is described assuming a magnetic energy density showing an orthorhombic symmetry with a twofold axis normal to the film and planar anisotropy axes at ±pi/4 of the c axis of the substrate; however, due to the comparative deduced values of the pertinent coefficients, this energy density is predominantly tetragonal. In the thickest film (83 nm), one of the planar anisotropy axes is parallel to c and approximate tetragonal symmetry is no more observed. Moreover, the orthorhombic symmetry is not completely fulfilled and a small misalignment between the principal directions connected to the uniaxial and the fourfold energy terms appears. Finally, the perpendicular surface standing modes, which are observed in MS-FMR and in BLS spectra, allow evaluation of the exchange stiffness constant. Good agreement between BLS and MS-FMR measurements has been found.
Evolution of the infrared Tully-Fisher relation up to z=1.4
Creators: name: Lorenzo, M. Fernández
name: Cepa, J.
name: Bongiovanni, A.
name: García, A. M. Pérez
name: Lara-López, M. A.
name: Pović, M.
name: Sánchez-Portal, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Tully-Fisher relation (TFR) represents a connection between fundamental galaxy parameters, such as its total mass and the mass locked in stars. Therefore, the study of the evolution of this relation in the optical and infrared bands can provide valuable information about the evolution of the individual galaxies through the changes found in each band. This work aims to study the TFR at high redshift in the B, V, R, I, and K-bands by comparison with the local relations derived from a large sample of galaxies in the redshift range 0.1
description: 14 pages, 10 figures; accepted in A&A
Electrical Generation of Pure Spin Currents in a Two-Dimensional Electron Gas
Creators: name: Frolov, S. M.
name: Venkatesan, A.
name: Yu, W.
name: Folk, J. A.
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 73.23.-b; 72.25.-b

description: Pure spin currents are generated and detected in micron-wide channels of a GaAs two-dimensional electron gas, using quantum point contacts in an in-plane magnetic field as injectors and detectors. The enhanced sensitivity to spin transport offered by a nonlocal measurement geometry enables accurate spin current measurements in this widely studied physical system. The polarization of the contacts is used to extract the quantum point contact g factor and provides a test for spontaneous polarization at 0.7 structure. The spin relaxation length in the channel is 30–50 µm over the magnetic field range 3–10 T, much longer than has been reported in GaAs two-dimensional electron gases but shorter than that expected from Dyakonov-Perel relaxation.
Angular dependence of the tunneling anisotropic magnetoresistance in magnetic tunnel junctions
Creators: name: Matos-Abiague, Alex
name: Gmitra, Martin
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: tunneling magnetoresistance, spin-orbit coupling, magnetic tunnel junctions
subject: 530 Physik
subject: 73.43.Jn, 72.25.Dc, 73.43.Qt

description: Based on general symmetry considerations we investigate how the dependence of the tunneling anisotropic magnetoresistance (TAMR) on the magnetization direction is determined by the specific form of the spin-orbit coupling field. By extending a phenomenological model, previously proposed for explaining the main trends of the TAMR in (001) ferromagnet/semiconductor/normal-metal magnetic tunnel junctions (MTJs) [J. Moser et al., Phys. Rev. Lett. 99, 056601 (2007)], we provide a unified qualitative description of the TAMR in MTJs with different growth directions. In particular, we predict the forms of the angular dependence of the TAMR in (001),(110), and (111) MTJs with structure inversion asymmetry and/or bulk inversion asymmetry. The effects of in-plane uniaxial strain on the TAMR are also investigated.
Volatile aroma and bioactive compounds diversity in wild populations of rosemary (Salvia rosmarinus Schleid.) from Italy cultivated under homogeneous environmental conditions
Creators: name: Raffo, Antonio
name: Baiamonte, Irene
name: Lupotto, Elisabetta
name: Nardo, Nicoletta
name: Paoletti, Flavio
name: Cervelli, Claudio
Publisher: name: Zenodo
Year: 2022
Subjects: Rosmarinus officinalis
aroma compound
essential oil
antioxidant
biodiversity

description: Current and potential uses of Rosemary (Salvia rosmarinus Schleid.) in the food, cosmetic and pharmaceutical industry are based on the sensory properties and biological activities related to Volatile Organic Compounds (VOCs) and non-volatile bioactive compounds, such as phenolic diterpenes and acids. Fifty-six rosemary plants from the CREA germplasm collection, representing 14 wild populations (4 plants for each population) collected in different geographical areas across Italy, were characterised for VOCs and phenolic diterpenes and acids. Three chemotypes were identified and associated to different geographical areas, with marked differences in the levels of key odorants, such as 1,8-cineole, verbenone and camphor, and key antioxidant compounds, such as carnosic acid. Genotypes characterised by potentially better flavour profile seemed also to be associated with enhanced level of bioactive compounds and related functional properties This diversity can be exploited to design specific products for the food and flavouring industry, with improved flavour quality and functional properties.
Turbulent 3D MHD dynamo model in spherical shells: Regular oscillations of the dipolar field
Creators: name: Simitev, R. D.
name: Busse, F. H.
name: Kosovichev, A. G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We report the results of three-dimensional numerical simulations of convection-driven dynamos in relatively thin rotating spherical shells that show a transition from an strong non-oscillatory dipolar magnetic field to a weaker regularly oscillating dipolar field. The transition is induced primarily by the effects a stress-free boundary condition. The variation of the inner to outer radius ratio is found to have a less important effect.
description: http://www.stanford.edu/group/ctr/Summer/SP10/index.html
Pumping of Vibrational Excitations in the Coulomb-blockade Regime in a Suspended Carbon Nanotube
Creators: name: Hüttel, Andreas K.
name: Witkamp, Benoit
name: Leijnse, Martin
name: Wegewijs, Maarten R.
name: van der Zant, Herre S. J.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 63.22.Gh
subject: 73.23.Hk
subject: 73.63.Fg

description: Low-temperature transport spectroscopy measurements on a suspended few-hole carbon nanotube quantum dot are presented, showing a gate-dependent harmonic excitation spectrum which, strikingly, occurs in the Coulomb-blockade regime. The quantized excitation energy corresponds to the scale expected for longitudinal vibrations of the nanotube. The electronic transport processes are identified as cotunnel-assisted sequential tunneling, resulting from nonequilibrium occupation of the mechanical mode. They appear only above a high-bias threshold at the scale of electronic nanotube excitations. We discuss models for the pumping process that explain the enhancement of the nonequilibrium occupation and show that it is connected to a subtle interplay between electronic and vibrational degrees of freedom.
A Particle Finite Element Method based on Level Set functions
Creators: name: Eduardo, Fernández
name: Simon, Février
name: Martin, Lacroix
name: Romain, Boman
name: Luc, Papeleux
name: Jean-Philippe, Ponthot
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Since the seminal work of Idelsohn, Oñate and Del-Pin (2004), the Particle Finite Element Method (PFEM) has relied on a Delaunay triangulation and the Alpha--Shape (AS) algorithm in the remeshing process. This approach guarantees a good quality of the Lagrangian mesh, but introduces a list of shortcomings that demand geometrical treatments tailored to each problem. In order to improve the remeshing process in PFEM, this work proposes the use of a Level--Set (LS) function instead of the Alpha--Shape algorithm. Since the Level--Set considers the boundary of the fluid and its interior, and not only a geometric criterion as does the Alpha--Shape, the proposed strategy (PFEM--LS) shows more robustness than the classical approach (PFEM--AS) owing to three main improvements. First, the LS function allows for a better control over the elements that are created during the fluid/fluid contact, which helps to reduce mass creation. Second, it helps to preserve the smoothness of the free surface and to reduce mass loss. Third, it allows the meshing of solitary particles that are detached from the free surface, which improves the representation of drops in PFEM. The methodology is presented and validated using free surface flow problems in 2D.
description: 28 pages, research article