cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Close-up Cloud
Creators: name: Junginger, Pauline
name: Ostendorf, Dennis
name: Avila Vissirini, Barbara
name: Voloshina, Anastasia
name: Hausmann, Timo
name: Kreiseler, Sarah
name: Dörk, Marian
Publisher: name: International Journal for Digital Art History
Year: 2020

description: This paper introduces a visualization technique designed to uncover iconographic patterns prevalent within a collection while at the same time allowing close viewing of these particular details. Challenging an institutionalized understanding of overview and detail as inherently opposed, the intention of this research is to develop a visualization method that accounts for the iconographic abundance of a collection and encourages its casual exploration. Expanding digitization efforts have led to a growing number of rich cultural heritage datasets that are successively being published online. At the same time scholars are exploring the potential of computational methods to expand the scale and scope of art history. In this context, data visualization is often equated with a distanced perspective diminishing the intricate and intriguing details of individual artifacts. In collaboration with a museum of applied and decorative arts, we have devised a novel interface concept for the exploration of image collections such as historical glass plate negatives. Inspired by photographic plates on a light table, the resulting Close-up Cloud translates the art historical method of close viewing into the digital by combining it with a dynamic representation of quantitative iconographic patterns across an entire image collection.
description: International Journal for Digital Art History, No 5 (2020): History of Digital Art
Chenopodium striatum L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: T. striatum L. Cat. L und 68. l: Vernayaz (F.). - 2: Branson-Fully (Christ 1856, Thellung 1911 u. a.), hier zwischen 520 und 900 m (Gams); Champlan (nach Schinz und Keller).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Optimal synchronizability of bearings
Creators: name: Araújo, N. A. M.
name: Seybold, H.
name: Baram, R. M.
name: Herrmann, H. J.
name: Andrade, J. S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Bearings are mechanical dissipative systems that, when perturbed, relax toward a synchronized (bearing) state. Here we find that bearings can be perceived as physical realizations of complex networks of oscillators with asymmetrically weighted couplings. Accordingly, these networks can exhibit optimal synchronization properties through fine tuning of the local interaction strength as a function of node degree [Motter, Zhou, and Kurths, Phys. Rev. E 71, 016116 (2005)]. We show that, in analogy, the synchronizability of bearings can be maximized by counterbalancing the number of contacts and the inertia of their constituting rotor disks through the mass-radius relation, $m\sim r^α$, with an optimal exponent $α=α_{\times}$ which converges to unity for a large number of rotors. Under this condition, and regardless of the presence of a long-tailed distribution of disk radii composing the mechanical system, the average participation per disk is maximized and the energy dissipation rate is homogeneously distributed among elementary rotors.
description: 5 pages, 6 figures, to appear in Physical Review Letters
The survey of planetary nebulae in Andromeda (M 31) V. Chemical enrichment of the thin and thicker discs of Andromeda. Oxygen to argon abundance ratios for planetary nebulae and H II regions
Creators: name: Arnaboldi, Magda
name: Bhattacharya, Souradeep
name: Gerhard, Ortwin
name: Kobayashi, Chiaki
name: Freeman, Kenneth C.
name: Caldwell, Nelson
name: Hartke, Johanna
name: McConnachie, Alan
name: Guhathakurta, Puragra
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use oxygen and argon abundances for planetary nebulae (PNe) with low internal extinction (progenitor ages of (>4.5 Gyr) and high extinction (progenitor ages <2.5 Gyr), as well as those of the H II regions, to constrain the chemical enrichment and star formation efficiency in the thin and thicker discs of M31. The argon element is produced in larger fraction by Type Ia supernovae (SNe) than oxygen. We find that the mean log(O/Ar) values of PNe as a function of their argon abundances, 12 + log(Ar/H), trace the inter-stellar matter (ISM) conditions at the time of birth of the M 31 disc PN progenitors. Thus the chemical enrichment and star formation efficiency information encoded in the [alpha/Fe] vs. [Fe/H] distribution of stars is also imprinted in the oxygen-to-argon abundance ratio log(O/Ar) vs. argon abundance for the nebular emissions of the different stellar evolution phases. We propose to use the log(O/Ar) vs. (12 + log(Ar/H)) distribution of PNe with different ages to constrain the star-formation histories of the parent stellar populations in the thin and thicker M31 discs. For the inner M31 disc (R_{GC} < 14 kpc), the chemical evolution model that reproduces the mean log(O/Ar) values as function of argon abundance for the high- and low-extinction PNe requires a second infall of metal poorer gas during a gas-rich (wet) satellite merger. In M31, the thin disc is younger and less radially extended, formed stars at a higher star formation efficiency, and had a faster chemical enrichment timescale than the more extended, thicker disc. Both the thin and thicker disc in M31 reach similar high argon abundances ( 12 + log(Ar/H) ) ~ 6.7. The chemical and structural properties of the thin/thicker discs in M31 are thus remarkably different from those determined for the Milky Way thin and thick discs.
description: 13 pages, 12 figures. Accepted for publication on 16.07.2022 in Section 4. Extragalactic astronomy of Astronomy and Astrophysics
title: Neural networks and data-driven surrogate models for simulation of steady-state fracture growth
Creators: name: Kalyuzhnyuk, A.V.
name: Lapin,  R.L.
name: Murachev, A.S.
name: Osokina, A.E.
name: Sevostianov, A.I.
name: Tsvetkov, D.V.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: This work is devoted to an assessment of the application of machine learning algorithms in the prediction of a fracture's aspect ratio caused by the hydraulic fracturing. By the aspect ratio in this work is assumed the ratio of the larger half-axis of the fracture to the smaller one. The study shows the prospects of applying data-driven surrogate model methods (deep neural networks learning from data simulated by means of traditional solvers) to particle dynamics modelling of hydraulic fracturing. The solution obtained allows to predict the aspect ratio value quickly, and thus, to evaluate the volume of the hydraulic fracturing fluid injection necessary to achieve the required fracture length.
Phyllotaxis, Pushed Pattern-Forming Fronts and Optimal Packing
Creators: name: Pennybacker, Matthew
name: Newell, Alan C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We demonstrate that the pattern forming partial differential equation derived from the auxin distribution model proposed by Meyerowitz, Traas and others gives rise to all spiral phyllotaxis properties observed on plants. We show how the advancing pushed pattern front chooses spiral families enumerated by Fibonacci sequences with all attendant self similar properties and connect the results with the optimal packing based algorithms previously used to explain phyllotaxis. Our results allow us to make experimentally testable predictions.
description: 4 pages, 5 figures. Submitted to Physical Review Letters
title: Modeling plastic deformation and damage accumulation processes in structural steels under block non-symmetric low-cycle loading
Creators: name: Volkov, Ivan A.
name: Igumnov, Leonid A.
name: Shishulin, Denis N.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: To assess the reliability and the scope of applicability of the defining relations of mechanics of damaged media (MDM), plastic deformation and damage accumulation processes in a number of structural steels under low-cycle loading have been numerically investigated, and the obtained numerical results have been compared with the data from fullscale experiments. It is shown that the introduced MDM model qualitatively and quantitatively describes the main effects of plastic deformation and damage accumulation processes in structural alloys under block-type non-stationary non-symmetric low-cycle loading.
Viral genome structures are optimal for capsid assembly
Creators: name: Perlmutter, Jason D.
name: Qiao, Cong
name: Hagan, Michael F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Biomolecules (q-bio.BM)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Understanding how virus capsids assemble around their nucleic acid (NA) genomes could promote efforts to block viral propagation or to reengineer capsids for gene therapy applications. We develop a coarse-grained model of capsid proteins and NAs with which we investigate assembly dynamics and thermodynamics. In contrast to recent theoretical models, we find that capsids spontaneously `overcharge'; i.e., the negative charge of the NA exceeds the positive charge on capsid. When applied to specific viruses, the optimal NA lengths closely correspond to the natural genome lengths. Calculations based on linear polyelectrolytes rather than base-paired NAs underpredict the optimal length, demonstrating the importance of NA structure to capsid assembly. These results suggest that electrostatics, excluded volume, and NA tertiary structure are sufficient to predict assembly thermodynamics and that the ability of viruses to selectively encapsidate their genomic NAs can be explained, at least in part, on a thermodynamic basis.
description: 25 pages, 14 figures. Accepted for publication in eLife
Einstein-Gauss-Bonnet black strings at large $α$
Creators: name: Suzuki, Ryotaku
name: Tomizawa, Shinya
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The simplest black string in higher-dimensional general relativity (GR) is perhaps the direct product of a Schwarzschild spacetime and a flat spatial direction. However, it is known that the Einstein-Gauss-Bonnet theory does not allow such a trivial and simple solution. We propose a novel analytic technique, which assumes that the Gauss-Bonnet (GB) term becomes dominant over the Einstein-Hilbert (EH) term. Assuming the dimensionless coupling constant $α$ normalized by the horizon scale is large enough, we find that the spacetime is separated into the GB region and GR region, which are matched via the transition region where the GB and EH terms are comparable. Using this large $α$ approximation, we indeed construct new analytic solutions of black strings, from which we analytically compute various physical quantities of black strings at large $α$. Moreover, we confirm that all these analytic results are consistent with the numerical calculation. We also discuss the possible extension to general Einstein-Lovelock black holes.
description: 24 pages, 17 figures; v2: minor modifications, references added, 25 pages
title: Effect of bamboo weight faction on mechanical properties in non-asbestos composite of motorcycle brake pad
Creators: name: Sukrawan, Y.
name: Hamdani,  A.
name: Mardani, S.A.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: This study aims to determine the mechanical properties of the use of brake pads based on composite materials from bamboo fiber, and to evaluate the effect of replacement of brake pad material made from asbestos with natural materials to avoid the impacts of asbestosis substances, such as cancer. The method used several stages: weighing, mixing, inserting materials in molding, compacting, and sintering. The stages were carried out in three types of composites: Composite 1 (40% of bamboo fiber, 30% of MgO, and 30% of epoxy resin), composite 2 (50% of bamboo fiber, 25% of MgO, and 25% of epoxy resin), and composite 3 (60% of bamboo fiber, 20% of MgO, and 20% of epoxy resin). Tests for mechanical properties were carried out using a standard analysis, such as wear rate using ASTM D3702-94 standard, hardness test using ASTM D 785-03 type R, heat resistance using 2300 testing temperature, and composite brake lifetime analysis. The results showed that the composition of bamboo brought great influences on the mechanical properties. The best specimen had a wear rate of 0.9612.10-8 g/mm2 .s, hardness of 91.8 HRR, and heat resistance at 280°C with a duration of 810 days. It is expected that the use of composite brake pads made from bamboo fiber can replace brake pads made from asbestos, which is healthier and safer to use.
Causal games of work extraction with indefinite causal order
Creators: name: Francica, Gianluca
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An indefinite causal order, where the causes of events are not necessarily in past events, is predicted by the process matrix framework. A fundamental question is how these non-separable causal structures can be related to the thermodynamic phenomena. Here, we approach this problem by considering the existence of two cooperating local Maxwell's demons which try to exploit the presence of global correlations and indefinite causal order to optimize the extraction of work. Thus, we prove that it is possible to have a larger probability to lower the local energy to zero if causal inequalities are violated, and that can be extracted more average work with respect to a definite causal order. However, for non-interacting parties, for the system considered the work extractable cannot be larger than the definite causal order bound.
description: 6 pages, 1 figure. Comments welcome
title: Supercomputing analysis of fan-shaped waves in the Earth's crust at the depth of seismic activity
Creators: name: Sadovskii, V.M.
name: Sadovskaya, O.V.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: The high-speed process of tectonic faults formation in zones of seismic activity of the Earth's crust is analyzed in a plane strain state based on the model of elastic blocks interacting through a domino-structure under conditions of strong hydrostatic compression. Numerical simulation of the dynamics of emerging fan-shaped waves is performed by means of the developed computational algorithm and computer program for multiprocessor supercomputers of cluster architecture.
title: A mixed methods investigation of non-medical prescription stimulant use to promote wakefulness at an Atlantic Canadian university
Creators: name: King, Eleanor Rosalind
Publisher: name: Memorial University of Newfoundland
Year: 2020

description: This study is a mixed-methods investigation into the non-medical use of
 prescription stimulants for the purpose of staying awake among students at
 Memorial University of Newfoundland. The quantitative part of the study involved
 a comprehensive online survey, which asked for information regarding
 demographic characteristics and substance use, and included standardized measures
 of sleep, mental health and attitudes towards non-medical use of prescription drugs.
 A total of 3,699 participants were recruited and the clean, complete data for 3,160
 participants was used for the analysis. The prevalence of non-medical use of
 prescription stimulants for the purpose of staying awake was 3.1%. The factors
 associated with such use were alcohol, tobacco and nicotine vapour use, poor sleep
 quality, daytime sleepiness, and more liberal attitudes towards the non-medical use
 of prescription drugs. The factors associated with these more liberal attitudes
 include male gender, non-White ethnicity, international student status, alcohol,
 tobacco, and nicotine use, depressive symptoms and clinical level of anxiety
 symptoms. Factors associated with less liberal attitudes were part-time study and
 borderline level of anxiety symptoms.
 In order to provide more insight into why students use prescription
 stimulants for staying awake, ten semi-structured interviews were conducted.
 Participants reported obtaining the stimulants from friends who had prescriptions
 for ADHD, and stated that they were using them to stay awake longer in order to
 study, indicating that the underlying motive for misuse was academic stress.Participants recognized that such use could impact sleep and reported using
 exercise and meditation as alternatives to stimulant use, but admitted that
 stimulants were much more effective in the short-term. Any
 prevention/intervention programs should involve promoting sleep hygiene and
 academic skills, as well as highlighting the negative effects of non-medical
 prescription stimulant use. These programs should be aimed at the aforementioned
 groups of students who are at most risk of engaging in such use.
Perspective: The Glass Transition
Creators: name: Biroli, Giulio
name: Garrahan, Juan P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We provide here a brief perspective on the glass transition field. It is an assessment, written from the point of view of theory, of where the field is and where it seems to be heading. We first give an overview of the main phenomenological characteristics, or "stylised facts", of the glass transition problem, i.e. the central observations that a theory of the physics of glass formation should aim to explain in a unified manner. We describe recent developments, with a particular focus on real space properties, including dynamical heterogeneity and facilitation, the search for underlying spatial or structural correlations, and the relation between the thermal glass transition and athermal jamming. We then discuss briefly how competing theories of the glass transition have adapted and evolved to account for such real space issues. We consider in detail two conceptual and methodological approaches put forward recently, that aim to access the fundamental critical phenomenon underlying the glass transition, be it thermodynamic or dynamic in origin, by means of biasing of ensembles, of configurations in the thermodynamic case, or of trajectories in the dynamic case. We end with a short outlook.
description: Perspective article for the Special Topic Issue on the Glass Transition of Journal Chemical Physics
title: Finite element modeling and investigation of elastic homogeneous and heterogeneous materials
Creators: name: Leontiev, V.L.
name: Efremenkov, I.V.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: A novel finite element (FE) connected with orthogonal finite functions (OFF) was developed for ANSYS software and was tested. The FE is proposed for modeling and investigation of stress-strain states of homogeneous and heterogeneous elastic materials. The efficiency of the developed FE is demonstrated using the examples of plane problems of elasticity. The accuracy of this FE was found to be higher than that of the classical FE of ANSYS. Moreover, the developed FE was proved to require less computational time, and this difference in computational time increases with the increasing number of FE in the model.
A review of Axion Inflation in the era of Planck
Creators: name: Pajer, Enrico
name: Peloso, Marco
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Because the inflationary mechanism is extremely sensitive to UV-physics, the construction of theoretically robust models of inflation provides a unique window on Planck-scale physics. We review efforts to use an axion with a shift symmetry to ensure a prolonged slow-roll background evolution. The symmetry dictates which operators are allowed, and these in turn determine the observational predictions of this class of models, which include observable gravitational waves (potentially chiral), oscillations in all primordial correlators, specific deviations from scale invariance and Gaussianity and primordial black holes. We discuss the constraints on this class of models in light of the recent Planck results and comment on future perspectives. The shift symmetry is very useful in models of large-field inflation, which typically have monomial potentials, but it cannot explain why two or more terms in the potential are fine-tuned against each other, as needed for typical models of small-field inflation. Therefore some additional symmetries or fine-tuning will be needed if forthcoming experiments will constrain the tensor-to-scalar ratio to be r < 0.01.
description: 24 pages, 3 figures. Invited review to appear in Class. Quantum Grav
Metabolismus und Transport von Benzo[a]pyren in Caco-2-Zellen : Einfluss von sekundären Pflanzeninhaltsstoffen auf die Enzyme des Biotransformationsprozesses und den ABC-Transporter BCRP
Creators: name: Ebert, Bettina
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Caco-2
subject: xenobiotics metabolizing enzymes
subject: flavonoids
subject: BCRP
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
NUCLEAR FUSION: TOMORROW'S ENERGY PRODUCER
Creators: name: KUMAR, SAANVI S
Publisher: name: Zenodo
Year: 2022
Subjects: Nuclear fusion
Energy production
Sustainable energy
Clean energy
Tokamak
Plasma
Fusion reactions
Deuterium
Tritium
ITER
Nuclear waste
Baseload energy
Carbon-free energy

description: Nuclear fusion is a process that occurs naturally in stars and has the potential to provide a clean, safe, and virtually limitless source of energy for humanity. Research and development of nuclear fusion technology have been ongoing for several decades, with the aim of creating a functional fusion reactor that can generate electricity on a commercial scale. The primary challenge in achieving this goal is the need to control the extreme temperatures and pressures required to initiate and maintain the fusion reaction. However, recent advancements in materials science, superconducting magnets, and computer simulations have brought the prospect of a functioning fusion reactor closer than ever before. If successful, fusion energy could provide a sustainable and low-carbon source of electricity for the world's growing energy needs, while mitigating the environmental and safety risks associated with traditional fission-based nuclear power.
Magnetic thread twisting in a simulated solar atmosphere
Creators: name: Sumner, Chloe
name: Taroyan, Youra
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Plasma inflows accompany a variety of processes in the solar atmosphere such as heating of coronal loops and formation of prominences. Aims. We model a stratified solar atmosphere, within which a simulated prominence thread experiences density accumulation via a plasma inflow designed to mimic the formation process. We aim to investigate the interaction of such a system with torsional perturbations, and the possible consequences. Methods. The linearised equations of motion and induction are integrated to analyse the spatial and temporal evolution of torsional perturbations that are randomly driven at the photospheric footpoints. Results. Our results demonstrate that magnetic threads will experience twist amplification. Different sources and sinks of energy and the corresponding amplification mechanisms are identified. Threads reaching chromospheric heights are most susceptible to magnetic twisting with the maximum twist occurring near their footpoints. The amplifying twists are associated with a standing wave behaviour along the simulated threads. Conclusions. Our work suggests that torsional perturbations may be amplified within prominence threads, with strong magnetic twists forming at the footpoints. The amplification process is facilitated by small length scales in the background magnetic field. On the other hand, a small length scale in the background density inhibits growth. Possible consequences of the amplified twists, including their role in supporting the dense plasma within a prominence structure are discussed.
description: 11 pages and 1 appendix page, 8 figures. Accepted to A&A
Entwurf und Fertigung eines linearen elektromagnetischen Mikromotors nach dem Synchronprinzip
Creators: name: Föhse, Martin
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Linear synchronous motor
subject: thin film technology
subject: linear micro ball bearing
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Ultraschallgeschwindigkeitsmessungen zum Bioprozessmonitoring
Creators: name: Cha, Young-Lok
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Ultraschallgeschwindigkeit
subject: Bioprozessbeobachtung
subject: Software-Sensor
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
Spectral Properties of Disordered Interacting Non-Hermitian Systems
Creators: name: Ghosh, Soumi
name: Gupta, Sparsh
name: Kulkarni, Manas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-hermitian systems have gained a lot of interest in recent years. However, notions of chaos and localization in such systems have not reached the same level of maturity as in the Hermitian systems. Here, we consider non-hermitian interacting disordered Hamiltonians and attempt to analyze their chaotic behavior or lack of it through the lens of the recently introduced non-hermitian analog of the spectral form factor and the complex spacing ratio. We consider three widely relevant non-hermitian models which are unique in their ways and serve as excellent platforms for such investigations. Two of the models considered are short-ranged and have different symmetries. The third model is long-ranged, whose hermitian counterpart has itself become a subject of growing interest. All these models exhibit a deep connection with the non-hermitian Random Matrix Theory of corresponding symmetry classes at relatively weak disorder. At relatively strong disorder, the models show the absence of complex eigenvalue correlation, thereby, corresponding to Poisson statistics. Our thorough analysis is expected to play a crucial role in understanding disordered open quantum systems in general.
description: 12 pages, 15 figures, 3 tables
Influence of Rashba and Dresselhaus spin-orbit interactions of equal strengths on electron states in a circular quantum ring in the presence of a magnetic field
Creators: name: Kudryashov, V. V.
name: Baran, A. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: J.2

description: Solutions of the Schrödinger equation are obtained for an electron in a two-dimensional circular semiconductor quantum ring in the presence of both external uniform constant magnetic field and the Rashba and Dresselhaus spin-orbit interactions of equal strengths. Confinement is simulated by a realistic potential well of a finite depth. The dependence of the energy levels on a magnetic field strength, strength of spin-orbit interaction and a relative ring width is presented.
description: 6 pages, 2 figures, 1 table
Bestimmung und Vorhersage des Verschleißes für die Auslegung von Dichtungen
Creators: name: Debler, Christoph
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Seals
subject: abrasion
subject: wear computation
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Spitzer-IRAC survey of molecular jets in Vela-D
Creators: name: Giannini, T.
name: Lorenzetti, D.
name: De Luca, M.
name: Strafella, F.
name: Elia, D.
name: Maiolo, B.
name: Marengo, M.
name: Maruccia, Y.
name: Massi, F.
name: Nisini, B.
name: Olmi, L.
name: Salama, A.
name: Smith, H. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a survey of H2 jets from young protostars in the Vela-D molecular cloud (VMR-D), based on Spitzer -IRAC data between 3.6 and 8.0 micron. Our search has led to the identification of 15 jets and about 70 well aligned knots within 1.2 squared degree. We compare the IRAC maps with observations of the H2 1-0 S(1) line at 2.12 micron, with a Spitzer-MIPS map at 24 and 70 micron, and with a map of the dust continuum emission at 1.2 mm. We find a association between molecular jets and dust peaks. The jet candidate exciting sources have been searched for in the published catalog of the Young Stellar Objects of VMR-D. We selected all the sources of Class II or earlier which are located close to the jet center and aligned with it.The association between jet and exciting source was validated by estimating the differential extinction between the jet opposite lobes. We are able to find a best-candidate exciting source in all but two jets. Four exciting sources are not (or very barely) observed at wavelengths shorter than 24 micron, suggesting they are very young protostars. Three of them are also associated with the most compact jets. The exciting source Spectral Energy Distributions have been modeled by means of the photometric data between 1.2 micron and 1.2 mm. From SEDs fits we derive the main source parameters, which indicate that most of them are low-mass protostars. A significant correlation is found between the projected jet length and the [24] - [70] color, which is consistent with an evolutionary scenario according to which shorter jets are associated with younger sources. A rough correlation is found between IRAC line cooling and exciting source bolometric luminosity, in agreement with the previous literature. The emerging trend suggests that mass loss and mass accretion are tightly related phenomena and that both decrease with time.
description: Accepted by The Astrophysical Journal
Peramium repens L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: T. repens L. Cat. 70. Bis 2606 m: beim Hotel Fluhalp ob Zermatt (Becherer 1944). Weitere hohe Stellen sind: Gr. St. Bernhard, Schweiz: beim Zollhaus, 2451 m, und ebenda, Italien: um das Hotel Italia, 2449 m (idem 1952). Var. typicum A. et G. f. roseum Peterm. - l: Les Marécottes (J.). - 3: Kalpetran (Becherer); Brig (idem). - 3a: Gabi (Becherer). Var. alpinum Schur - Angenähert: l: Rhonesand zwischen Vernayaz und den Follateres (F. Brunner). Var. alpestre GUSS. (var. Biasolettii [Steudel et Höchst.] A. et G.) -2: Tassonniéres (Gams). - 3: Chippis (nach Schinzund Keller).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
The first minutes of a binary-driven hypernova
Creators: name: Becerra, L. M.
name: Moradi, R.
name: Rueda, J. A.
name: Ruffini, R.
name: Wang, Y.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We simulate the first minutes of the evolution of a binary-driven hypernova (BdHN) event, with a special focus on the associated accretion processes of supernova (SN) ejecta onto the newborn neutron star ($ν$NS) and the NS companion. We calculate the rotational evolution of the $ν$NS and the NS under the torques exerted by the accreted matter and the magnetic field. We take into account general relativistic effects and use realistic hypercritical accretion rates obtained from three-dimensional smoothed-particle-hydrodynamics (SPH) numerical simulations of the BdHN for a variety of orbital periods. We show that the rotation power of the $ν$NS has a unique double-peak structure while that of the NS has a single peak. These peaks are of comparable intensity and can occur very close in time or even simultaneously depending on the orbital period and the initial angular momentum of the stars. We outline the consequences of the above features in the early emission and their consequent observation in long gamma-ray bursts (GRBs).
description: Accepted for publication in Physical Review D
Untersuchungen zu molekularen Mechanismen der Regulation der Hepatitis B Virus Replikation
Creators: name: Gehrke, Christina
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Hepatitis B Virus
subject: Mutationen
subject: Superinfektion
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Silicid-, Borid- und Carbid-Beschichtung hochschmelzender Metalle mittels Gasphasenreaktion
Creators: name: Friedhoff, Wibke
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Boride
subject: Silicide
subject: Carbide
subject: Beschichtung
subject: Gasphasenreaktion
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: [no abstract]
Group of Four Fish from the Shurin Tekagami (Illustrated Book of Fishes)
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019

description: Three labels (clockwise from the top) identify each fish as follows: 1. 紅之於世゛ Benishioze (Schlegel's red bass; Caprodon schlegelii); 2. 左之保古 Sashihoko (Pine-cone fish; Menocentris japonica); 3. 加麻須子 Kamasuko (二種 two species) 漢名 黄固魚 / 讃州方言 伊加奈古゛ (Japanese sand lance; Ammodytes personatus). For further clarification, consult the key to the image in the Art Properties curatorial file.
A Deterministic Affine-Quadratic Optimal Control Problem
Creators: name: Wang, Yuanchang
name: Yong, Jiongmin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49J15, 49K15, 49L20, 49N10

description: A Deterministic affine quadratic optimal control problem is considered. Due to the nature of the problem, optimal controls exist under some very mild conditions. Further, it is shown that under some assumptions, the value function is differentiable and therefore satisfies the corresponding Hamilton-Jacobi-Bellman equation in the classical sense. Moreover, the so-called quasi-Riccati equation is derived and any optimal control admits a state feedback representation.
description: 30 pages
Struktur-Teratogenitäts-Studien von Valproinsäure-Analogen : Inhibierung von Histondeacetylasen und Pharmakokinetik ausgewählter Derivate im Mausmodell
Creators: name: Eikel, Daniel
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Valproic acid
subject: teratogenicity
subject: histonedeacetylases
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Studying a precessing jet of a massive young stellar object within a chemically rich region
Creators: name: Paron, S.
name: Mast, D.
name: Fariña, C.
name: Areal, M. B.
name: Ortega, M. E.
name: Martinez, N. C.
name: Peña, M. Celis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In addition to the large surveys and catalogs of massive young stellar objects and outflows, dedicated studies of particular sources, in which high-angular observations (mainly at near-IR and mm) are analyzed in depth, are needed to shed light on the processes involved in the formation of massive stars. The galactic source G079.1272+02.2782 (G79), a MYSO at about 1.4 kpc, is an ideal source to carry out this kind of studies. Near-IR integral field spectroscopic observations were carried out using NIFS at Gemini-North. The spectral and angular resolutions, allow us to perform a detailed study of the source and its southern jet, resolving structures with sizes between 200 and 300 au. As a complement, millimeter data retrieved from the JCMT and the IRAM 30m telescope databases were analyzed to study the molecular gas at a larger spatial scale. The analysis of a jet extending southwards shows cork-screw like structures at 2.2 um continuum, strongly suggesting that the jet is precessing. The jet velocity is estimated in 30-43 km/s and it is coming to us along the line of sight. We suggest that the precession may be produced by the gravitational tidal effects generated in a probable binary system, and we estimate a jet precession period of about 10^3 yr, indicating a slow-precessing jet, which is in agreement with the observed helical features. An analysis of H2 lines along the jet allows us to investigate in detail a bow-shock produced by this jet. We find that this bow-shock is indeed generated by a C-type shock and it is observed coming to us, with some inclination angle, along the line of sight. This is confirmed by the analysis of molecular outflows at a larger spatial scale. A brief analysis of several molecular species at millimeter wavelengths indicates a complex chemistry developing at the external layers of the molecular clump in which MYSO G79 is embedded.
description: Accepted to be published in A&A (August 4, 2022)
title: Temporal and spatial changes in benthic mollusc (bivalves and gastropods) communities in inner Frobisher Bay, Nunavut, Baffin Island over fifty years
Creators: name: Herder, Erin Coleen
Publisher: name: Memorial University of Newfoundland
Year: 2020

description: Benthic fauna are a crucial part of the marine ecosystem providing many ecosystem services. Unfortunately, Arctic coastal marine environments are under tremendous pressure from changing climate conditions and it is becoming increasingly important to understand community changes occurring in these environments. Long-term ecological studies in the Canadian Arctic are rare, however, Frobisher Bay provides a unique opportunity to study long-term change in the marine benthos because historical benthic community datasets exist for this region. We focused on the molluscs as indicators of long-term change by comparing community temporal and spatial changes between 1967-1976 and 2016. Significant changes in community composition were observed between these two time periods and shifts in functional trait characteristics were also observed. These changes coincided with long-term environmental change in the region. Our results highlight the need for long-term systematic sampling which is fundamental to our understanding of Arctic marine ecosystems and for identifying long-term ecosystem change.
Switchable nanometer contacts: Ultrathin Ag nanostructures on Si(100)
Creators: name: Gardinowski, G.
name: Schmeidel, J.
name: Pfnür, Herbert
name: Block, T.
name: Tegenkamp, Christoph
Publisher: name: College Park, MD : American Institute of Physics
Year: 2006
Subjects: subject: Alcohols
subject: Metallic compounds
subject: Nanostructured materials
subject: Scanning tunneling microscopy
subject: Silver
subject: Ultrathin films
subject: Vacuum applications
subject: Conductivity measurements
subject: Electromigration (EM)
subject: Ferrocenedithiol molecules
subject: Ultrahigh vacuum conditions
subject: Nanotechnology
subject: FOS: Nanotechnology
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The fabrication and characterization of metallic nanometer-sized gaps suitable for conductivity measurements of single molecules were studied. Controlled gap formation by electromigration (EM) is demonstrated in contiguous and ultrathin Ag structures wetting the Si(100) substrate. The gaps obtained are in the range of nanometers or even subnanometers, as revealed by lateral conductivity measurements and scanning tunneling microscopy carried out under ultrahigh vacuum conditions. Annealing to 300 K closes the gap by enabling surface diffusion of Ag, and another cycle of opening by EM at 80 K can be performed. The functionality of the contacts is demonstrated by insertion of ferrocenedithiol molecules into the gap. © 2006 American Institute of Physics.
Untersuchung der naturwissenschaftlichen Fragmente des stoischen Philosophen Poseidonios und ihrer Bedeutung für seine Naturphilosophie
Creators: name: Grewe, Christa-Vera
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Antike
subject: Philosophie
subject: Naturwissenschaft
subject: Dewey Decimal Classification::100 | Philosophie

description: [no abstract]
Relative Phase and Josephson Dynamics between Weakly Coupled Richardson Models
Creators: name: Buccheri, F.
name: Trombettoni, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We consider two weakly coupled Richardson models to study the formation of a relative phase and the Josephson dynamics between two mesoscopic attractively interacting fermionic systems: our results apply to superconducting properties of coupled ultrasmall metallic grains and to Cooper-pairing superfluidity in neutral systems with a finite number of fermions. We discuss how a definite relative phase between the two systems emerges and how it can be conveniently extracted from the many-body wavefunction: we find that a definite relative phase difference emerges even for very small numbers of pairs ~10. The Josephson dynamics and the current-phase characteristics are then investigated, showing that the critical current has a maximum at the BCS-BEC crossover. For the considered initial conditions a two-state model gives a good description of the dynamics and of the current-phase characteristics.
description: 20 pages, 15 figures
Multi-angle holographic characterization of individual fractal aggregates
Creators: name: Abdulali, Rafe
name: Altman, Lauren E.
name: Grier, David G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Holographic particle characterization uses quantitative analysis of holographic microscopy data to precisely and rapidly measure the diameter and refractive index of individual colloidal spheres in their native media. When this technique is applied to inhomogeneous or aspherical particles, the measured diameter and refractive index represent properties of an effective sphere enclosing each particle. Effective-sphere analysis has been applied successfully to populations of fractal aggregates, yielding an overall fractal dimension for the population as a whole. Here, we demonstrate that holographic characterization also can measure the fractal dimensions of an individual fractal cluster by probing how its effective diameter and refractive index change as it undergoes rotational diffusion. This procedure probes the structure of a cluster from multiple angles and thus constitutes a form of tomography. Here we demonstrate and validate this effective-sphere interpretation of aspherical particles' holograms through experimental studies on aggregates of silica nanoparticles grown under a range of conditions.
description: 7 pages, 4 figures
The cosmic $e^\pm$ anomaly
Creators: name: Auchettl, Katie
name: Balazs, Csaba
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Via a Bayesian likelihood analysis using 219 recent cosmic ray spectral data points we extract the anomalous part of the cosmic $e^\pm$ flux. First we show that a significant tension exists between the $e^\pm$ related and the rest of the fluxes. Interpreting this tension as the presence of an anomalous component in the $e^\pm$ related data, we then infer the values of selected cosmic ray propagation parameters excluding the anomalous data sample from the analysis. Based on these values we calculate background predictions with theoretical uncertainties for PAMELA and Fermi-LAT. We find a statistically significant deviation between the Fermi-LAT $e^-+e^+$ data and the predicted background even when (systematic) uncertainties are taken into account. Identifying this deviation as an anomalous $e^\pm$ contribution, we make an attempt to distinguish between various sources that may be responsible for the anomalous $e^\pm$ flux.
description: Appeared in Proceedings of the 14th Workshop 'What Comes Beyond the Standard Models', 11. - 21. July 2011 Bled, DMFA-Zaloznistvo, Ljubljana, December 2011
On quantum gravity, Asymptotic Safety, and paramagnetic dominance
Creators: name: Nink, Andreas
name: Reuter, Martin
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the conceptual ideas underlying the Asymptotic Safety approach to the nonperturbative renormalization of gravity. By now numerous functional renormalization group studies predict the existence of a suitable nontrivial ultraviolet fixed point. We use an analogy to elementary magnetic systems to uncover the physical mechanism behind the emergence of this fixed point. It is seen to result from the dominance of certain paramagnetic-type interactions over diamagnetic ones. Furthermore, the spacetimes of Quantum Einstein Gravity behave like a polarizable medium with a "paramagnetic" response to external perturbations. Similarities with the vacuum state of Yang-Mills theory are pointed out.
description: 20 pages, 3 figures. Conference proceedings based on a plenary talk given by M.R. at the 13th Marcel Grossmann Meeting, Stockholm, 1-7 July 2012
Seminário "Calibração de sensores meteorológicos - variável temperatura"
Creators: name: Santana, Márcio A. A.
Publisher: name: Zenodo
Year: 2020
Subjects: instrumentação meteorológica
Metrologia Ambiental
calibração
termômetro
análise de dados da calibração
tratamento de dados da calibração
avaliação da incerteza da calibração

description: Seminário "Calibração de sensores meteorológicos - variável temperatura". FCAV/UNESP - Campus de Jaboticabal, Programa de Pós-graduação em Agronomia (Ciência do Solo), Disciplina: Instrumentação e Automação Aplicada ao Manejo do Solo e da Água.
description: Versão 2 - revisão de unidades de medidas e gráficos