cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Results in Second-Order Elasticity with Live Loads (obtained with Mathematica)
Creators: name: Iaccarino, Gianni Luca
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2008

description: We present a generalization of Signorini’s method to the case of live loads which allows us to derive approximate solutions to some pure traction-value problems in nite elastostatics. The boundary value problems and the corresponding compatibility conditions are formulated in order to determine the displacement of the system up to the second-order approximation. In particular, we consider the case of homogeneous and isotropic elastic bodies and we solve the following two pure traction-value problems with live loads: (i) a sphere subjected to the action of a uniform pressure eld; (ii) a hollow circular cylinder whose inner and outer surfaces are subjected to uniform pressures. Then, starting from these solutions, we suggest
experiments to determine the second-order constitutive constants of the elastic body. Expressions of the second-order material constants in terms of displacements and Lamé coefcients are determined. Further we apply the eneralized Signorini’s perturbation scheme to analyze radial expansion/contraction of an hollow cylinder made of an isotropic functionally graded elastic material, whose material moduli depend upon the radial coordinate only. We study the case of an hollow circular cylinder under uniform internal and external pressure. The displacement of the sysii tem and its state of stress are determined up to the second-order approximation. We consider both compressible and incompressible functionally graded elastic bodies.
The quantitative analysis of all the described problems has been carried out with the aid of the software Mathematica by Wolfram Research. The programs which have allowed to nd the solutions to these problems are presented and their characteristics are discussed.
Positionsgenauigkeit und Verfügbarkeit verbessern
Creators: name: Beuche, Horst
name: Hellebrand, Hans Jürgen
Publisher: name: LANDTECHNIK
Year: 1998

description: Die satellitengestützte Positionsbestimmung GPS hat sich als besonders geeignet für die Ortungstechnik in der teilflächenspezifischen Feldbewirtschaftung erwiesen. Nur mit der differentiellen Betriebsart DGPS können die Genauigkeitsanforderungen der Feldbewirtschaftung erreicht werden. Bei ungünstigen Bedingungen treten Ausfälle auf. Verbindet man DGPS mit dem unabhängig ermittelten Geschwindigkeitsvektor des Fahrzeuges, können DGPS-Ausfälle überbrückt werden. Mit Radarsensoren wird die Geschwindigkeit gemessen. Zur Richtungsbestimmung könnten magnetfeld- oder drehratensensitive Sensoren Verwendung finden. Leistungsfähigkeit, Preise und Handhabung schränken die Einsetzbarkeit dieser Richtungsgeber ein .Die zusätzliche Verwertung von ortungsrelevanten Daten aus der Feldarbeit, wie das Fahren in geraden Spuren, erweitert die Möglichkeiten zur Richtungs- und Positionsbestimmung. Während der geradlinigen Fahrt kann durch eine regressive Verrechnung von DGPS-Werten die Präzision erhöht und eine genaue Fahrtrichtung abgeleitet werden. Bei DGPS-Ausfall ist dann diese Richtung Grundlage für die Extrapolation des Fahrweges.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
Mit dem Computer auf das Feld
Creators: name: Jürschik, Peter
Publisher: name: LANDTECHNIK
Year: 1998

description: Der Einsatz der Satellitenortung mit DGPS (Differential Global Positioning System) im Pflanzenbau soll den Landwirten helfen, Bewirtschaftungsmaßnahmen zu optimieren. Dazu müssen Felddaten mit exaktem Koordinatenbezug erfasst werden. Der Beitrag diskutiert eine technische Lösung für die Datenerfassung auf der Basis eines Pencomputers, mit der eine hohe Funktionalität und eine besonders einfache Bedienung auf dem Feld realisiert werden kann.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
Composite Interstellar Grains
Creators: name: Vaidya, D. B.
name: Gupta, Ranjan
name: Snow, T. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The composite grain is made up of a host silicate spheroid and graphite inclusions. The extinction efficiencies of the composite spheroidal grains for three axial ratios are computed using the discrete dipole approximation (DDA). The interstellar extinction curve is evaluated in the spectral region 3.40--0.10$μm$ using the extinction efficiencies of the composite spheroidal grains. The model extinction curves are then compared with the average observed interstellar extinction curve. We also calculate the linear polarization for the spheroidal composite grains at three orientation angles and find the wavelength of maximum polarization. Further, we estimate the volume extinction factor, an important parameter from the point of view of cosmic abundance, for the composite grain models that reproduce the average observed interstellar extinction. The estimated abundances derived from the composite grain models for both carbon and silicon are found to be lower than that are predicted by the bare silicate/graphite grain models but these values are still higher than that are implied from the recent ISM values.
description: 11 pages, 12 figures, 5 tables To appear in 2007 MNRAS
Learning to design drug-like molecules in three-dimensional space using deep generative models
Creators: name: Li, Yibo
name: Pei, Jianfeng
name: Lai, Luhua
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Machine Learning (cs.LG)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Recently, deep generative models for molecular graphs are gaining more and more attention in the field of de novo drug design. A variety of models have been developed to generate topological structures of drug-like molecules, but explorations in generating three-dimensional structures are still limited. Existing methods have either focused on low molecular weight compounds without considering drug-likeness or generate 3D structures indirectly using atom density maps. In this work, we introduce Ligand Neural Network (L-Net), a novel graph generative model for designing drug-like molecules with high-quality 3D structures. L-Net directly outputs the topological and 3D structure of molecules (including hydrogen atoms), without the need for additional atom placement or bond order inference algorithm. The architecture of L-Net is specifically optimized for drug-like molecules, and a set of metrics is assembled to comprehensively evaluate its performance. The results show that L-Net is capable of generating chemically correct, conformationally valid, and highly druglike molecules. Finally, to demonstrate its potential in structure-based molecular design, we combine L-Net with MCTS and test its ability to generate potential inhibitors targeting ABL1 kinase.
Crucial role of interfacial $s$-$d$ exchange interaction in the temperature dependence of tunnel magnetoresistance
Creators: name: Masuda, Keisuke
name: Tadano, Terumasa
name: Miura, Yoshio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The tunnel magnetoresistance (TMR) is one of the most important spintronic phenomena but its reduction at finite temperature is a severe drawback for applications. Here, we reveal a crucial determinant of the drawback, that is, the $s$-$d$ exchange interaction between conduction $s$ and localized $d$ electrons at interfacial ferromagnetic layers. By calculating the temperature dependence of the TMR ratio in Fe/MgO/Fe(001), we show that the obtained TMR ratio significantly decreases with increasing temperature owing to the spin-flip scattering in the $Δ_1$ state induced by the $s$-$d$ exchange interaction. The material dependence of the coupling constant $J_{sd}$ is also discussed on the basis of a nonempirical method.
description: 6 pages, 5 figures, 1 table
The bicycle as a symbol of lifestyle, status and distinction. A cultural studies analysis of urban cycling (sub)cultures in Berlin
Creators: name: Hoor, Maximilian
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 380 Handel, Kommunikation, Verkehr
subject: urban cycling
subject: cycling cultures
subject: cultural studies
subject: consumer cultures
subject: lifestyle
subject: fixed-gear bicycles

description: The bicycle has been gaining attention in planning, politics, academia and across the media and has become increasingly present in urban landscapes and popular cultures: young urbanites ride minimalistic, stylish and individualised bicycles and wear messenger bags for their commute to work or to university. Additionally, bicycles can be seen in lifestyle blogs, advertising, shop windows or living rooms as decoration and eye-catchers. Taking this observation as a starting point, I focus my research on how bicycles, especially fixed-gear bikes and recent cycling trends are being used to express lifestyle, status, and social distinction in an urban middleclass context. In order to investigate further, I conducted a cultural studies analysis based on participant observations and media analysis exploring cultural meanings and practices in urban cycling cultures in Berlin, Germany. My research leads me to the result that the bicycle is increasingly turning into a key object of popular urban culture, combining tendencies of commercialisation, specialisation and standardisation, with a strong focus on aesthetics, design, lifestyle and consumerism. In the context of urban cultures, the bicycle is therefore experiencing a symbolic revaluation, making it desirable to more and more urbanites, but also more exclusive.
Qualitätsmerkmale biogener Festbrennstoffe
Creators: name: Hartmann, Hans
name: Böhm, Thorsten
Publisher: name: LANDTECHNIK
Year: 1998

description: Merkmale und Einflüsse auf qualitätsbestimmende Eigenschaften biogener Festbrennstoffe sind vielfältig. Nur wenige lassen sich gezielt durch Maßnahmen wie Düngungsumstellung oder verlängerte Feldverweilzeiten beeinflussen. Der Verzicht auf chlorhaltige Düngemittel senkte den Cl-Gehalt in Versuchen mit Triticalestroh nur wenig. Chlor und Kalium sind aber nach der Ernte leicht durch Niederschläge auszuwaschen, wie Versuche mit Landschaftspflegeheu zeigen. Dadurch treten auch Verbesserungen beim Ascheerweichungsverhalten ein.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
Publishable Summary for 22IEM04 MQB-Pascal Metrology for quantum-based traceability of the pascal (June 2023)
Creators: name: Rubin, Tom
Publisher: name: Zenodo
Year: 2023
Subjects: Quantum-Pascal
MQB-Pascal
pressure
quantum-based
density
nitrogen

description: This is the Publishable Summary for the MQB-Pascal project. The overall objective of this EU project is to establish a metrological infrastructure for a traceable quantum‑based pascal in the 1 Pa to 1 MPa range via the realisation of instrumentation and dissemination of the technology with minimal loss of performance to stakeholders. The methods will also be evaluated in terms of practical applications.
Solarbetriebene Tropfbewässerung in Ägypten
Creators: name: Müller, Joachim
name: Köller, Karlheinz
name: Algohary, Sherif
name: Hegazi, Ahmed
Publisher: name: LANDTECHNIK
Year: 1998

description: Da sowohl die Energie zur Wasserförderung als auch das Wasser als solches begrenzte Ressourcen im Bewässerungslandbau darstellen, kommt der Entwicklung wasser- und energiesparender Bewässerungssysteme wachsende Bedeutung zu. Vor diesem Hintergrund wurde ein photovoltaisch betriebenes Niederdruck Tropfbewässerungssystem konzipiert und in Ägypten zur Bewässerung einer 1,7 ha großen Dattel/Zitrus-Plantage eingesetzt. Die installierte Leistung des Solargenerators beträgt 530 Wp. Der Wirkungsgrad bei der Wandlung von Strahlungsenergie in hydraulische Energieerreichte 3 %. Durch Anpassung der Solargeneratorleistung an die Lastkennlinie der Pumpe sowie durch regelmäßige Reinigung der Solarmodule lässt sich der Wirkungsgrad noch erheblich steigern.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
Analytic solutions of the nonlinear radiation diffusion equation with an instantaneous point source in non-homogeneous media
Creators: name: Krief, Menahem
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Computational Physics (physics.comp-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Analytic solutions to the nonlinear radiation diffusion equation with an instantaneous point source for a non-homogeneous medium with a power law spatial density profile, are presented. The solutions are a generalization of the well known solutions for a homogeneous medium. It is shown that the solutions take various qualitatively different forms according to the value of the spatial exponent. These different forms are studied in detail for linear and non linear heat conduction. In addition, by inspecting the generalized solutions, we show that there exist values of the spatial exponent such the conduction front has constant speed or even accelerates. Finally, the various solution forms are compared in detail to numerical simulations, and a good agreement is achieved.
description: The following article has been accepted for publication in Physics of Fluids
Kontaktbelastung bei empfindlichen Produkten
Creators: name: Herold, Bernd
name: Geyer, Martin
Publisher: name: LANDTECHNIK
Year: 1998

description: Frisches Obst und Gemüse sind sehr empfindlich gegen mechanische Belastung. Bei Kernobst genügt bereits leichter Kontakt mit harten Gegenständen, um die Zellstruktur an der Fruchtoberfläche zu beschädigen und damit erhebliche Qualitätsminderungen hervorzurufen. Mithilfe eines taktilen Foliensensors lässt sich die Druckverteilung an der Kontaktfläche zwischen der ganzen Frucht und dem Belastungsgegenstand experimentell bestimmen. Anhand der Messdaten können die Belastbarkeit des Zellgewebes sowie der Einfluss der Form und der Elastizität der Kontaktpartner, beispielsweise Verpackungsmaterial, bewertet werden.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
EMPRESS. IV. Extremely Metal-Poor Galaxies (EMPGs) Including Very Low-Mass Primordial Systems with M*=10^4--10^5 M_sun and 2--3% (O/H)_sun: High (Fe/O) Suggestive of Metal Enrichment by Hypernovae/Pair-Instability Supernovae
Creators: name: Isobe, Yuki
name: Ouchi, Masami
name: Suzuki, Akihiro
name: Moriya, Takashi
name: Nakajima, Kimihiko
name: Nomoto, Ken'ichi
name: Rauch, Michael
name: Harikane, Yuichi
name: Kojima, Takashi
name: Ono, Yoshiaki
name: Fujimoto, Seiji
name: Inoue, Akio K.
name: Kim, Ji Hoon
name: Komiyama, Yutaka
name: Kusakabe, Haruka
name: Lee, Chien-Hsiu
name: Maseda, Michael
name: Matthee, Jorryt
name: Michel-Dansac, Leo
name: Nagao, Tohru
name: Nanayakkara, Themiya
name: Nishigaki, Moka
name: Onodera, Masato
name: Sugahara, Yuma
name: Xu, Yi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Keck/LRIS follow-up spectroscopy for 13 photometric candidates of extremely metal poor galaxies (EMPGs) selected by a machine-learning technique applied to the deep (~26 AB mag) optical and wide-area (~500 deg^2) Subaru imaging data in the EMPRESS survey. Nine out of the 13 candidates are EMPGs with an oxygen abundance (O/H) less than ~10% solar value (O/H)_sun, and four sources are contaminants of moderately metal-rich galaxies or no emission-line objects. Notably, two out of the nine EMPGs have extremely-low stellar masses and oxygen abundances of 5*10^4--7*10^5 M_sun and 2--3% (O/H)_sun, respectively. With a sample of five EMPGs with (Fe/O) measurements, two (three) of which are taken from this study (the literature), we confirm that two EMPGs with the lowest (O/H) ratios of ~2% (O/H)_sun show high (Fe/O) ratios of ~0.1, close to the solar abundance ratio. Comparing galaxy chemical enrichment models, we find that the two EMPGs cannot be explained by a scenario of metal-poor gas accretion/episodic star-formation history due to their low (N/O) ratios. We conclude that the two EMPGs can be reproduced by an inclusion of bright hypernovae and/or hypothetical pair-instability supernovae (SNe) preferentially produced in a metal-poor environment. This conclusion implies that primordial galaxies at z~10 could have a high abundance of Fe that is not originated from Type Ia SNe with delays, and that Fe may not serve as a cosmic clock for primordial galaxies.
description: ApJ in Press
Wavelet Based Semi-blind Channel Estimation For Multiband OFDM
Creators: name: Sadough, Sajad
name: Ichir, Mahieddine
name: Jaffrot, Emmanuel
name: Duhamel, Pierre
Publisher: name: arXiv
Year: 2007
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: This paper introduces an expectation-maximization (EM) algorithm within a wavelet domain Bayesian framework for semi-blind channel estimation of multiband OFDM based UWB communications. A prior distribution is chosen for the wavelet coefficients of the unknown channel impulse response in order to model a sparseness property of the wavelet representation. This prior yields, in maximum a posteriori estimation, a thresholding rule within the EM algorithm. We particularly focus on reducing the number of estimated parameters by iteratively discarding ``unsignificant'' wavelet coefficients from the estimation process. Simulation results using UWB channels issued from both models and measurements show that under sparsity conditions, the proposed algorithm outperforms pilot based channel estimation in terms of mean square error and bit error rate and enhances the estimation accuracy with less computational complexity than traditional semi-blind methods.
Staubbelastungen vermeiden
Creators: name: Fürll, Christian
name: Kranz, Udo
Publisher: name: LANDTECHNIK
Year: 1998

description: Das pneumatische Befüllen von Kraftluttersilos über Zyklone vermindert die Entmischung des Gutes im Silo. Der zulässige Grenzwert des Staubgehaltes in der Abluft ist jedoch ohne Zellradschleuse nur schwer einzuhalten. Die Untersuchungen haben gezeigt, dass dies gelingt, wenn der Zyklon für den jeweiligen Einsatzfall optimiert wird und der Abschlusskegel am Zyklonausgang in der richtigen Lage angeordnet ist. Auf eine zusätzliche Nachentstaubung mit Filtern kann dann verzichtet werden.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
Milchsäuregewinnung aus Getreide
Creators: name: Richter, Klaus
name: Reimann, Winfried
name: Yeo, Boung
Publisher: name: LANDTECHNIK
Year: 1998

description: Bei der industriellen Erzeugung von Milchsäure benutzte man bisher als Rohstoff hauptsächlich reine Stoffe wie Saccharose, Glucose und Stärke, aber auch komplexere Medien wie Melasse und Molke. Anhand von Untersuchungen im Technikumsmaßstab wird gezeigt, dass Milchsäure auch durch Direktverwertung von Getreidekörnern gewonnen werden kann.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
Prospects for direct cosmic ray mass measurements through the Gerasimova-Zatsepin effect
Creators: name: Lafèbre, S.
name: Falcke, H.
name: Hörandel, J.
name: Kuijpers, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Solar radiation field may break apart ultra high energy cosmic nuclei, after which both remnants will be deflected in the interplanetary magnetic field in different ways. This process is known as the Gerasimova-Zatsepin effect after its discoverers. We investigate the possibility of using the detection of the separated air showers produced by a pair of remnant particles as a way to identify the species of the original cosmic ray primary directly. Event rates for current and proposed detectors are estimated, and requirements are defined for ideal detectors of this phenomenon. Detailed computational models of the disintegration and deflection processes for a wide range of cosmic ray primaries in the energy range of 10^16 to 10^20 eV are combined with sophisticated detector models to calculate realistic detection rates. The fraction of Gerasimova-Zatsepin events is found to be of the order of 10^-5 of the cosmic ray flux, implying an intrinsic event rate of around 0.07 km^-2 sr^-1 yr^-1 in the energy range defined. Event rates in any real experiment, however, existing or under construction, will probably not exceed 10^-2 yr^-1.
description: 4 pages, 4 figures
Ilustraciones en el ámbito editorial en el Perú. Entrevista a Gerardo Arturo Ramirez Neyra
Creators: name: Delgado Del Aguila, Jesús Miguel
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 460799
subject: Graphics, augmented reality and games not elsewhere classified

description: Gerardo Arturo Ramirez Neyra nació el 23 de febrero de 1984 en Lima (Perú). Realizó estudios de Antropología en la Universidad Nacional Mayor de San Marcos y cursó talleres artísticos en el Museo de Arte de Lima, en los que perfeccionó sus dibujos de manga, retrato, acuarelas y figuras humanas. En el 2018, estudió Diseño Gráfico en IDAT.Esta entrevista se realizó el 4 de julio de 2021 de forma audiovisual.
The complex organic molecular content in the L1498 starless core
Creators: name: Jimenez-Serra, Izaskun
name: Vasyunin, Anton I.
name: Spezzano, Silvia
name: Caselli, Paola
name: Cosentino, Giuliana
name: Viti, Serena
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Observations carried out toward starless and pre-stellar cores have revealed that complex organic molecules are prevalent in these objects, but it is unclear what chemical processes are involved in their formation. Recently, it has been shown that complex organics are preferentially produced at an intermediate-density shell within the L1544 pre-stellar core at radial distances of ~4000 au with respect to the core center. However, the spatial distribution of complex organics has only been inferred toward this core and it remains unknown whether these species present a similar behaviour in other cores. We report high-sensitivity observations carried out toward two positions in the L1498 pre-stellar core, the dust peak and a position located at a distance of ~11000 au from the center of the core where the emission of CH$_3$OH peaks. Similarly to L1544, our observations reveal that small O-bearing molecules and N-bearing species are enhanced by factors ~4-14 toward the outer shell of L1498. However, unlike L1544, large O-bearing organics such as CH3CHO, CH3OCH3 or CH3OCHO are not detected within our sensitivity limits. For N-bearing organics, these species are more abundant toward the outer shell of the L1498 pre-stellar core than toward the one in L1544. We propose that the differences observed between O-bearing and N-bearing species in L1498 and L1544 are due to the different physical structure of these cores, which in turn is a consequence of their evolutionary stage, with L1498 being younger than L1544.
description: Accepted for Astrophysical Journal
Exotic dielectric behaviors induced by pseudo-spin texture in magnetic twisted bilayer
Creators: name: Shen, Yu-Hao
name: Tong, Wen-Yi
name: Hu, He
name: Zheng, Jun-Ding
name: Duan, Chun-Gang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Twisted van der Waals bilayers provide an ideal platform to study the electron correlation in solids. Of particular interest is the 30 degree twisted bilayer honeycomb lattice system, which possesses an incommensurate moire pattern and uncommon electronic behaviors may appear due to the absence of phase coherence. Such system is extremely sensitive to further twist and many intriguing phenomena will occur. In this work, based on first-principles calculations we show that, for further twist near 30 degree, there could induce dramatically different dielectric behaviors of electron between left and right twisted cases. Specifically, it is found that the left and right twists show suppressed and amplified dielectric response under vertical electric field, respectively. Further analysis demonstrate that such exotic dielectric property can be attributed to the stacking dependent charge redistribution due to twist, which forms twist-dependent pseudospin textures. We will show that such pseudospin textures are robust under small electric field. As a result, for the right twisted case, there is almost no electric dipole formation exceeding the monolayer thickness when the electric field is applied. Whereas for the left case, the system could even demonstrate negative susceptibility, i.e. the induced polarization is opposite to the applied field, which is very rare in the nature. Such findings not only enrich our understanding on moire systems but also open an appealing route toward functional 2D materials design for electronic, optical and even energy storage devices.
description: arXiv admin note: substantial text overlap with arXiv:1912.08439
Stilllegungs-Management
Creators: name: Brunotte, Joachim
name: Biller, Rainer H.
Publisher: name: LANDTECHNIK
Year: 1998

description: Als Zielsetzung der Flächenstilllegung haben für den Landwirt besonders die biologische Nematodenbekämpfung in Zuckerrübenfruchtfolgen und oder die Verbesserung der Bodenstruktur und der biologischen Aktivität Bedeutung. Um diese Anforderungen zu erfüllen, sind energie- und kostensparende Mechanisierungsverfahren Voraussetzung. Von der Möglichkeit der Selbstbegrünung auf stillgelegten Flächen wird aus den verschiedensten Gründen kaum noch Gebrauch gemacht, sondern die aktive Begrünung bevorzugt.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
Fortschritte in der Simulation schnellfahrender Traktoren
Creators: name: Von Holst, Christian
name: Göhlich, Horst
Publisher: name: LANDTECHNIK
Year: 1998

description: Der zunehmende Einsatz von 3D-CAD Programmen, Mehrkörpersystem Simulationssoftware (MKS-Software), Finite Elemente Methoden Programmen (FEM Programmen) und ähnlicher Software erleichtert und beschleunigt zwar viele Entwicklungen, schafft aber auch zusätzliche Risiken und Probleme. Diese Risiken werden aufgezeigt und Lösungswege vorgeschlagen. Besonderes Augenmerk wird dabei auf die Modelle und deren Verifikation gelegt, da hier häufig die Ursache für unbefriedigende Ergebnisse zu suchen ist.
description: LANDTECHNIK, Bd. 53 Nr. 3 (1998)
Quark-Hadron Phase Transitions in Brane-World Cosmologies
Creators: name: De Risi, Giuseppe
name: Harko, Tiberiu
name: Lobo, Francisco S. N.
name: Pun, Chun Shing Jason
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: When the universe was about 10 $μ$seconds old, a first order cosmological quark - hadron phase transition occurred at a critical temperature of around 200 MeV. In this work, we study the quark-hadron phase transition in the context of brane-world cosmologies, in which our Universe is a three-brane embedded in a five-dimensional bulk, and within an effective model of QCD. We analyze the evolution of the physical quantities, relevant for the physical description of the early universe, namely, the energy density, temperature and scale factor, before, during, and after the phase transition. To study the cosmological dynamics and evolution we use both analytical and numerical methods. In particular, due to the high energy density in the early Universe, we consider in detail the specific brane world model case of neglecting the terms linearly proportional to the energy density with respect to the quadratic terms. A small brane tension and a high value of the dark radiation term tend to decrease the effective temperature of the quark-gluon plasma and of the hadronic fluid, respectively, and to significantly accelerate the transition to a pure hadronic phase. By assuming that the phase transition may be described by an effective nucleation theory, we also consider the case where the Universe evolved through a mixed phase with a small initial supercooling and monotonically growing hadronic bubbles.
description: 13 pages, 8 figures, accepted for publication in Nucl. Phys. B
Stigma and Cervical Cancer Prevention: A Scoping Review of the U.S. Literature
Creators: name: Goben, Abigail
name: Peterson, Caryn
name: Silva, Abigail
name: Ongtengco, Natalia
name: Hu, Elise
name: Khanna, Deepika
name: Nussbaum, Elizabeth
name: Jasenof, Ian
name: Kim, Sage
name: Andrew Dykens, J.
Publisher: name: University of Illinois at Chicago
Year: 2021
Subjects: subject: 111799 Public Health and Health Services not elsewhere classified
subject: FOS: Health sciences

description: Cervical cancer is preventable through HPV vaccination and screening however, uptake falls below national targets. A scoping review was conducted to describe stigmas related to HPV infection and vaccination and cervical cancer and screening in the US. Results were organized into the domains proposed by Stangl and colleagues’ Health Stigma and Discrimination Framework. Common drivers of stigma were fear of social judgement and rejection, self-blame, and shame. Positive facilitators included social norms that provided motivation to receive HPV vaccination and screening. Gender and social norms were notable negative facilitators of stigma. HPV infection and cervical cancer resulted in stigma marking through the belief that both result from incautious behavior—either multiple sexual partners or failing to get screening. Stereotyping and prejudice were stigma practices attributed to HPV infection and cervical cancer through these same behaviors. Stigma experiences related to HPV infection, cervical cancer, and abnormal screening results included altered self-image based on perceived/anticipated stigma, as well as discrimination. This review advances understanding of the multiple dimensions of stigma associated with these outcomes in the US population. Three areas warrant additional consideration. Future studies should 1) assess how stigma dimensions affect uptake of cervical cancer preventions efforts; 2) focus on US women most affected by cervical cancer incidence and mortality to identify potential differences in these dimensions and tailor interventions accordingly; 3) include women from geographic areas of the US with high rates of cervical cancer to adapt interventions that address potential regional variations in resources and need.
Well-Tempered Minkowski Solutions in Teleparallel Horndeski Theory
Creators: name: Bernardo, Reginald Christian
name: Said, Jackson Levi
name: Caruana, Maria
name: Appleby, Stephen
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Well-tempering stands among the few classical methods of screening vacuum energy to deliver a late-time, low energy vacuum state. We build on the class of Horndeski models that admit a Minkowski vacuum state despite the presence of an arbitrarily large vacuum energy to obtain a much larger family of models in teleparallel Horndeski theory. We set up the routine for obtaining these models and present a variety of cases, all of which are able to screen a natural particle physics scale vacuum energy using degeneracy in the field equations. We establish that well-tempering is the unique method of utilizing degeneracy in Horndeski scalar-tensor gravity -- and its teleparallel generalisation -- that can accommodate self-tuned flat Minkowski solutions, when the explicit scalar field dependence in the action is minimal (a tadpole and a conformal coupling to the Ricci scalar). Finally, we study the dynamics of the well-tempered teleparallel Galileon. We generate its phase portraits and assess the attractor nature of the Minkowski vacuum under linear perturbations and through a phase transition of vacuum energy.
description: 34 pages, 5 figures, v2: minor revisions, template changed, to appear in CQG
Meilensteine der Landtechnik
Creators: name: Herrmann, Klaus
Publisher: name: LANDTECHNIK
Year: 1998

description: Wie bereits seit 1987 werden an dieser Stelle landtechnische Innovationen vorgestellt, die zu ihrer Zeit die Landwirtschaft verändert, zumindest aber ein gutes Stück vorangebracht haben. Verfolgt man die Mechanisierung der Landwirtschaft entlang der Meilensteine der Landtechnik 25, 50, 75 Jahre und länger zurück, dann wird man erstaunt feststellen, dass viele Ideen und Lösungsvorschläge gar nicht so neu sind, wie sie scheinen.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Fine tuning and the ratio of tensor to scalar density fluctuations from cosmological inflation
Creators: name: Hotchkiss, Shaun
name: German, Gabriel
name: Ross, Graham G
name: Sarkar, Subir
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The form of the inflationary potential is severely restricted if one requires that it be natural in the technical sense, i.e. terms of unrelated origin are not required to be correlated. We determine the constraints on observables that are implied in such natural inflationary models, in particular on $r$, the ratio of tensor to scalar perturbations. We find that the naturalness constraint does not require $r$ to be lare enough to be detectable by the forthcoming searches for B-mode polarisation in CMB maps. We show also that the value of $r$ is a sensitive discriminator between inflationary models.
description: 8 pages LaTeX; clarifications and a reference added; to appear in JCAP
Dijet production in diffractive deep inelastic scattering at HERA
Creators: name: ZEUS Collaboration
name: Chekanov, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The production of dijets in diffractive deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of $61 \pbi$. The dijet cross section has been measured for virtualities of the exchanged virtual photon, $5 < Q^2 < 100 \gev^2$, and $γ^{*} p$ centre-of-mass energies, 100 < W < 250 GeV. The jets, identified using the inclusive k_{T} algorithm in the $γ^* p$ frame, were required to have a transverse energy $E^*_{T, \rm jet} > 4 \gev$ and the jet with the highest transverse energy was required to have $E^*_{T,\rm jet} > 5 \gev$. All jets were required to be in the pseudorapidity range $-3.5 < η^*_{\rm jet} < 0$. The differential cross sections are compared to leading-order predictions and next-to-leading-order QCD calculations based on recent diffractive parton densities extracted from inclusive diffractive deep inelastic scattering data.
description: 41 pages, 10 figures, 13 tables. Typos corrected in Table 11
Measurement of the spin polarization of the magnetic semiconductor EuS with zero-field and Zeeman-split Andreev reflection spectroscopy
Creators: name: Ren, Cong
name: Trbovic, J.
name: Kallaher, R. L.
name: Braden, J. G.
name: Parker, J. S.
name: von Molnár, S.
name: Xiong, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report measurements of the spin polarization (\textbf{\textit{P}}) of the concentrated magnetic semiconductor EuS using both zero-field and Zeeman-split Andreev reflection spectroscopy (ARS) with EuS/Al planar junctions. The zero-field ARS spectra are well described by the modified (spin-polarized) BTK model with expected superconducting energy gap and actual measurement temperature (no additional spectral broadening). The fittings consistently yield \textbf{\textit{P}} close to 80% regardless of the barrier strength. Moreover, we performed ARS in the presence of a Zeeman-splitting of the quasiparticle density of states in Al. To describe the Zeeman-split ARS spectra, we develop a theoretical model which incorporates the solution to the Maki-Fulde equations into the modified BTK analysis. The method enables the determination of the magnitude as well as the sign of \textbf{\textit{P}} with ARS, and the results are consistent with those from the zero-field ARS. The experiments extend the utility of field-split superconducting spectroscopy from tunnel junctions to Andreev junctions of arbitrary barrier strengths.
description: 6 pages, 4 figures
Entrevista a Audrey Louyer sobre la investigación y la canalización de la Literatura peruana fantástica. Un enfoque francés
Creators: name: Delgado Del Aguila, Jesús Miguel
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 470520
subject: Literature in Spanish and Portuguese

description: Entrevista realizada a Audrey Louyer sobre la Literatura peruana fantástica
Spin Field Effect Transistors with Ultracold Atoms
Creators: name: Vaishnav, J. Y.
name: Ruseckas, Julius
name: Clark, Charles W.
name: Juzeliunas, Gediminas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a method of constructing cold atom analogs of the spintronic device known as the Datta-Das transistor (DDT), which despite its seminal conceptual role in spintronics, has never been successfully realized with electrons. We propose two alternative schemes for an atomic DDT, both of which are based on the experimental setup for tripod stimulated Raman adiabatic passage. Both setups involve atomic beams incident on a series of laser fields mimicking the relativistic spin orbit coupling for electrons that is the operating mechanism of the DDT.
Teleservicesysteme
Creators: name: Meyer, Henning Jürgen
name: Kausch, Carsten
name: Diekhans, Norbert
Publisher: name: LANDTECHNIK
Year: 1998

description: Teleservicesysteme ermöglichen durch die Nutzung moderner Kommunikationstechniken die Schaffung neuer effektiver Servicestrukturen, bei denen von einer zentralen Leitstelle aus weltweit Servicedienstleistungen zur Verfügung gestellt werden. Insbesondere für Erntemaschinen können mit Teleservicesystemen Ausfälle, bei denen direkt oder indirekt erhebliche Kosten entstehen, vermieden werden.
description: LANDTECHNIK, Bd. 53 Nr. 2 (1998)
Properties of Black Hole Radiation From Tunnelling
Creators: name: Clifton, Timothy
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the space-time associated with the evaporation of a black hole by quantum mechanical tunnelling events. It is shown that the surface through which tunnelling occurs is distinct from the global event horizon, and that this has consequences for the radiation reaching future null infinity. A spherical collapse process is modelled, and the radiation expected to be observed at future null infinity is calculated. It is shown that external observers witness an evaporation process that begins as the tunnelling surface is exposed, and ends as the collapsing object passes behind its event horizon. The sensitivity of emitted radiation to the collapse process is illustrated.
description: 14 pages, 6 figures
“IDS crossing of the Blood-Brain Barrier corrects CNS defects in MPSII mice”
Creators: name: Polito, Vinicia Assunta
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: IDS Crossing of the Blood-Brain Barrier Corrects CNS Defects in MPSII Mice

Mucopolysaccharidosis type II (MPSII), or Hunter syndrome, arises from a deficiency in iduronate 2-sulfatase (IDS), and it is characterized by progressive somatic and neurological involvement. The MPSII mouse model reproduces the features of MPSII patients. Systemic administration of the AAV2/5CMV-hIDS vector in MPSII mouse pups results in the full correction of glycosaminoglycan (GAG) accumulation in visceral organs and in the rescue of the defects and GAG accumulation in the central nervous system (CNS). Remarkably, in treated MPSII animals, this CNS correction arises from the crossing of the blood-brain barrier by the IDS enzyme itself, not from the brain transduction. Thus, I show in this thesis that early treatment of MPSII mice with one systemic injection of AAV2/5CMV-hIDS results in prolonged and high levels of circulating IDS that can efficiently and simultaneously rescue both visceral and CNS defects for up to 18 months after therapy.
John Everett Millais's Christ in the house of his parents : a Pre-Raphaelite religious image in the Royal Academy Exhibition of 1850
Creators: name: Kerr, Deborah Mary
Publisher: name: University of British Columbia
Year: 2010

description: In 1850, John Everett Millais showed an untitled depiction of the Holy Family in London's Royal Academy Exhibition. This investigation focusses upon Millais's work, which was subsequently titled Christ in the House of his Parents, and upon the largely negative response of the ten journals which reviewed it. Millais belonged to a group called the Pre-Raphaelite Brotherhood, which, discontented with the idealized High Renaissance style favoured by the Academy, attempted to create a new form of art. Central to this endeavour, and characteristic of Christ in the House of his Parents, was a medievalizing style and a minutely detailed naturalism. It is most likely that Millais hoped his work would be well-received, since both medievalism and naturalism were already established in the English art world. Naturalism appealed mainly to middle-class art patrons, and medievalism, too, had found a public. Where Millais did deviate from the norm was in combining naturalism and medievalism with religious subject matter, and here he made a crucial error, insofar as pleasing his public was concerned. While dissatisfaction with Academic art was widespread, particularly among the middle classes, this was superseded, when religious imagery was involved, by a firm loyalty to Academic idealizing conventions. As a result, Millais's particularized figures were perceived as ugly, and some journals even linked them with the urban poor. Ultimately, this response was tied to their fear of the poor, and to their rejection of the liberal haute bourgeois philosophy which had originally shaped the Poor Laws, in 1834. Millais's medievalism was widely held to be antithetical to progress. Critics from all positions on the class and political spectrum hastened to assert their belief in progress, whether in the arts or in the sciences, and to castigate Millais for the apparent retrogressiveness of his picture. Only one journal, The Guardian, departed from the above pattern and expressed approval for the work. Significantly, it did not equate medievalism with retrogression, and it had no fear of the poor to be activated by Millais's particularized figures. Nonetheless, it experienced difficulty with the painting's naturalism, since, like the hostile periodicals, it too subscribed to the idealizing conventions of the Academy. Ironically, it was only when Millais finally abandoned his medievalism, and avoided religious subject matter entirely, that he began to experience some of the critical and popular acclaim which he evidently hoped would be accorded to Christ in the House of his Parents.
Reimagining Regional Governance in Latin America
Creators: name: Merke, Federico
name: Stuenkel, Oliver
name: Feldmann, Andreas
Publisher: name: University of Illinois at Chicago
Year: 2021
Subjects: Uncategorized

description: Latin America’s existing predicament stems from a complex set of interlinked social, economic, and political crises, which have been magnified by the advent of the coronavirus pandemic and a rising tide of isolationism and “antiglobalism.” These crises range from domestic polarization and economic travails, to ideological divergence, personal rivalries among the region’s leaders and U.S.-Chinese geopolitical competition, and all are hampering regional governance and negatively impacting the prospects of cooperation.

Latin American governments urgently need to work together to address the manifold challenges they face as events in recent decades have shown that unless better regional mechanisms can be found, domestic and transnational challenges—from organized crime and environmental degradation to migration and anemic economic growth—will become even more difficult to address, with potentially devastating long-term consequences. Yet, despite the high stakes, traditional regional governance mechanisms seem paralyzed, lacking even the capacity to discuss the current untenable situation, let alone address it. The conventional wisdom is that regional cooperation across Latin America is practically nonexistent because its heads of states have insurmountable ideological differences and because the region’s dominant diplomatic institutions have failed to fulfill their purpose.

All is not lost in the realm of regional governance, however. While cooperation is either dysfunctional or nonexistent in many dimensions, in others it persists with surprising resilience and vigor, although it is often overlooked or underappreciated. Existing cooperation is for the most part technical and based on the committed work by government officials who, even during the bleakest moments of the pandemic, have shown adherence to principled norms and driven by a refreshing degree of pragmatism.

Effective regional governance and cooperation in Latin America is necessary for a broader conversation on the region’s role in a rapidly changing global order, shaped by technological transformation and genuinely global problems such as climate change, migratory pressures, and increasing security threats. As great power competition continues to shape the global order, Latin America often is regarded as a peripheral player. Yet far from being somehow apart or exempt from today’s rising geopolitical currents, Latin America, for better or for worse, is very much affected by them. Regional governance is a fundamental instrument to help Latin America overcome its numerous daunting challenges. Even when ideological differences make cooperation difficult at the high politics level, it is crucial to find avenues of progress at other levels and in informal or less visible ways.