cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spitzer-MIPS Observations of the eta Cha Young Association
Creators: name: Gautier, Thomas. N.
name: Rebull, L. M.
name: Stapelfeldt, K. R.
name: Mainzer, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have mapped the eta Chamaeleontis young stellar association in the far-infrared with the Multiband Imaging Photometer for Spitzer (MIPS) on the Spitzer Space Telescope. All sixteen members within the map region were detected at 24 um, along with five members at 70 um and two at 160 um. Ten stars show far-infrared excess emission indicating the presence of circumstellar disks; six of these have central clearings as evidenced by the onset of excess emission at >5 um. No new infrared excess sources are identified among the 113 2MASS field stars with 24 um photometry but not seen as X-ray sources, indicating that membership lists derived from X-ray surveys are reasonably complete. Circumstellar disks in the eta Cha association span the range from 1e-1 to 1e-4 in their fractional infrared luminosity, with a median Ldust /Lstar of 0.04. The presence of optically thick, optically thin, and intermediate optical depth disks within the same stellar group, in combination with the large fraction of disks with inner holes, indicates that the Cha association represents a crucial stage in circumstellar disk evolution.
description: To appear in The Astrophysical Journal
Methods for Producing Optical Coherent State Superpositions
Creators: name: Glancy, S.
name: Vasconcelos, H. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss several methods to produce superpositions of optical coherent states (also known as "cat states"). Cat states have remarkable properties that could allow them to be powerful tools for quantum information processing and metrology. A number of proposals for how one can produce cat states have appeared in the literature in recent years. We describe these proposals and present new simulation and analysis of them incorporating practical issues such as photon loss, detector inefficiency, and limited strength of nonlinear interactions. We also examine how each would perform in a realistic experiment.
description: 25 pages, 27 figures, revtex. Version 2 includes expanded discussion of some earlier methods and more references. Version 3 includes even more references and a more conclusive conclusion. Version 3 is the published version
Bhatia-Davis formula in the quantum speed limit
Creators: name: Liu, Jing
name: Miao, Zibo
name: Fu, Libin
name: Wang, Xiaoguang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Bhatia-Davis theorem provides a useful upper bound for the variance in mathematics, and in quantum mechanics, the variance of a Hamiltonian is naturally connected to the quantum speed limit due to the Mandelstam-Tamm bound. Inspired by this connection, we construct a formula, referred to as the Bhatia-Davis formula, for the characterization of the quantum speed limit in the Bloch representation. We first prove that the Bhatia-Davis formula is an upper bound for a recently proposed operational definition of the quantum speed limit, which means it can be used to reveal the closeness between the timescale of certain chosen states to the systematic minimum timescale. In the case of the largest target angle, the Bhatia-Davis formula is proved to be a valid lower bound for the evolution time to reach the target when the energy structure is symmetric. Regarding few-level systems, it is also proved to be a valid lower bound for any state in two-level systems with any target, and for most mixed states with large target angles in equally spaced three-level systems.
description: 9+8 pages, 8 figures
Few-Shot Conversational Dense Retrieval
Creators: name: Yu, Shi
name: Liu, Zhenghao
name: Xiong, Chenyan
name: Feng, Tao
name: Liu, Zhiyuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Dense retrieval (DR) has the potential to resolve the query understanding challenge in conversational search by matching in the learned embedding space. However, this adaptation is challenging due to DR models' extra needs for supervision signals and the long-tail nature of conversational search. In this paper, we present a Conversational Dense Retrieval system, ConvDR, that learns contextualized embeddings for multi-turn conversational queries and retrieves documents solely using embedding dot products. In addition, we grant ConvDR few-shot ability using a teacher-student framework, where we employ an ad hoc dense retriever as the teacher, inherit its document encodings, and learn a student query encoder to mimic the teacher embeddings on oracle reformulated queries. Our experiments on TREC CAsT and OR-QuAC demonstrate ConvDR's effectiveness in both few-shot and fully-supervised settings. It outperforms previous systems that operate in the sparse word space, matches the retrieval accuracy of oracle query reformulations, and is also more efficient thanks to its simplicity. Our analyses reveal that the advantages of ConvDR come from its ability to capture informative context while ignoring the unrelated context in previous conversation rounds. This makes ConvDR more effective as conversations evolve while previous systems may get confused by the increased noise from previous turns. Our code is publicly available at https://github.com/thunlp/ConvDR.
description: Accepted by SIGIR 2021
Scalar spin chirality and quantum Hall effect on a triangular lattice
Creators: name: Martin, Ivar
name: Batista, C. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the Kondo Lattice and Hubbard models on a triangular lattice for band filling factor 3/4. We show that a simple non-coplanar chiral spin ordering (scalar spin chirality) is naturally realized in both models due to perfect nesting of the Fermi surface. The resulting triple-Q magnetic ordering is a natural counterpart of the collinear Neel ordering of the half-filled square lattice Hubbard model. We show that the obtained chiral phase exhibits a spontaneous quantum Hall-effect with sigma_{xy}= e^2/h.
description: 4 pages 3 figs
Properties of the thioredoxin system in microaerophiles from the Streptococcus genus
Creators: name: Marco, Salvatore
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: The Streptococcus genus includes the pathogenic species S. mutans, the main responsible of dental caries, and the safe microorganism S. thermophilus, used for the manufacture of dairy products. These facultative anaerobes control the levels of reactive oxygen species (ROS) and indeed, both S. mutans and S. thermophilus possess a cambialistic superoxide dismutase, the key enzyme for a preventive action against ROS. To evaluate the properties of a crucial mechanism for repairing ROS damages, the molecular and functional characterization of the thioredoxin system in these streptococci was investigated. The putative genes encoding its protein components in S. mutans and S. thermophilus were analysed and the corresponding recombinant proteins were purified. A single thioredoxin reductase was obtained from either S. mutans (SmTrxB) or S. thermophilus (StTrxB1), whereas two thioredoxins were prepared from either S. mutans (SmTrxA and SmTrxH1) or S. thermophilus (StTrxA1 and StTrxA2). Both SmTrxB and StTrxB1 reduced the synthetic substrate DTNB in the presence of NADPH, whereas only SmTrxA and StTrxA1 accelerated the insulin reduction in the presence of DTT. To reconstitute an in vitro streptococcal thioredoxin system, the combined activity of the thioredoxin components was tested through the insulin precipitation in the absence of DTT. The assay functions with a combination of SmTrxB or StTrxB1 with either SmTrxA or StTrxA1. These results suggest that the streptococcal members of the thioredoxin system display a direct functional interaction between them and that these protein components are interchangeable within the Streptococcus genus. In conclusion, our data prove the existence of a functioning thioredoxin system even in these microaerophiles.
The actual Rees--Sciama effect from the Local Universe
Creators: name: Maturi, M.
name: Dolag, K.
name: Waelkens, A.
name: Springel, V.
name: Ensslin, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Observations of the Cosmic Microwave Background (CMB) have revealed an unexpected quadrupole-octopole alignment along a preferred axis pointing toward the Virgo cluster. We here investigate whether this feature can be explained in the framework of the concordance model by secondary anisotropies produced by the non-linear evolution of the gravitational potential, the so-called Rees-Sciama (RS) effect. We focus on the effect caused by the local superclusters, which we calculate using a constrained high-resolution hydrodynamical simulation, based on the IRAS 1.2-Jy all-sky galaxy redshift survey, which reproduces the main structures of our Universe out to a distance of 110 Mpc from our Galaxy. The resulting RS effect peaks at low multipoles and has a minimum/maximum amplitude of -6.6μK 1.9μK. Even though its quadrupole is well aligned with the one measured for the CMB, its amplitude is not sufficient to explain the observed magnitude of the quadrupole/octopole alignment. In addition, we analyze the WMAP-3 data with a linear matched filter in an attempt to determine an upper limit for the RS signal amplitude on large scales. We found that it is possible to infer a weak upper limit of 30μK for its maximum amplitude.
description: 7 pages, 4 figures, submitted to A&A
Dynamics of a ring of three unidirectionally coupled Duffing oscillators with time-dependent damping
Creators: name: Barba-Franco, J. J.
name: Gallegos, A.
name: Jaimes-Reátegui, R.
name: Gerasimova, S. A.
name: Pisarchik, A. N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We study dynamics of a ring of three unidirectionally coupled double-well Duffing oscillators for three different values of the damping coefficient: fixed dumping, proportional to time, and inversely proportional to time. The dynamics in all cases is analyzed through time series, Fourier and Hilbert transforms, Poincaré sections, as well as bifurcation diagrams and Lyapunov exponents with respect to the coupling strength. In the first case, we observe a well-known route from a stable steady state to hyperchaos through Hopf bifurcation and a series of torus bifurcations, as the coupling strength is increased. In the second case, the system is highly dissipative and converges into one of stable equilibria. Finally, in the third case, transient toroidal hyperchaos takes place.
Relative Dispersion of Surface Drifters in the North Sea: The Effect of Tides on Mesoscale Diffusivity
Creators: name: Meyerjürgens, Jens
name: Ricker, Marcel
name: Schakau, Vanessa
name: Badewien, Thomas H.
name: Stanev, Emil V.
Publisher: name: FID GEO
Year: 2020

description: We examine the relative dispersion and the contribution of tides on the relative diffusivities of surface drifters in the North Sea. The drifters are released in two clusters, yielding 43 pairs, in the vicinity of a tidal mixing front in the German Bight, which is located in the southeastern area of the North Sea. Both clusters indicate decreasing dispersion when crossing the tidal mixing front, followed by exponentially increasing dispersion with e-folding times of 0.5 days for Cluster 1 and 0.3 days for Cluster 2. A transition of the dispersion regimes is observed at scales of the order of the Rossby radius of deformation (10 km). After that, the relative dispersion grows with a power-law dependency with a short period of ballistic dispersion (quadratic growth), followed by a Richardson regime (cubic growth) in the final phase. Scale-dependent metrics such as the relative diffusivities are consistent with these findings, while the analysis of the finite-scale Lyapunov exponents (FSLEs) shows contradictory results for the submesoscales. In summary, the analysis of various statistical Lagrangian metrics suggests that tracer stirring at the submesoscales is nonlocal and becomes local at separation scales larger than 10 km. The analysis of meridional and zonal dispersion components indicates anisotropic dispersion at the submesoscales, which changes into isotropic dispersion on the mesoscales. Spectral analysis of the relative diffusivity gives evidence that semidiurnal and shallow-water tides influence relative diffusivity at the mesoscales, especially for drifter separations above 50 km.
«СССР на стройке» la vetrina europea di Stalin
Creators: name: Valeri, Marta
Publisher: name: Università degli  Studi di Milano
Year: 2015
Subjects: Propaganda sovietica; Fotografia; Europa – URSS; Gor’kij

description: The magazine “SSSR na stroike” (“USSR in Construction”) published in Russia, Germany, France, England was born in the early 1930s from an idea of Maksim Gorky. It was conceived as the successor of another well-known issue, “Nashi dostizhenia” to let the whole Europe know about the progress and successes of the First Five-Year Plan and of the related Soviet system. Beyond the propaganda, “SSSR na stroike” had another main task: opposing the negative image the Russians émigrés gave of their native country abroad. Official portraitists by the Soviet élite, photographers, intellectuals and artists with whose works USSR celebrated and created their own myths were chosen to realize this project. That way, new Soviet idols became the peasants from the series “24 hours at the Filippov’s” and the workers of “The Giant and the Builder”. The circulation of the magazine abroad could count on the help of foreign estimators of the Soviet model, who personally acted to spread these images, while in Russia the editor Pjatakov and valuable artists, such as A. Rodchenko, assured success and the quality of the content. So far research has focused on the graphic and artistic aspects of the magazine, mainly thanks to the studies of Erika Wolf, Professor of Art and Visual Culture at the University of Otago, while the historical, cultural and political importance of the magazine was marginally analyzed. It will be interesting to highlight language choices and editorial strategies used for such an issue, which should offer the internal élite a window on a changing country, while it should be a real shop window for estimators, foreign investors, simple spectators and also those who oppose the realization of the Soviet utopia in USSR.
description: Altre Modernità, 2015: NUMERO SPECIALE Finestre: sguardi e riflessi, trasparenze e opacità
Contrasting Global Patterns of Spatially Periodic Fairy Circles and Regular Insect Nests in Drylands
Creators: name: Getzin, Stephan
name: Yizhaq, Hezi
name: Cramer, Michael D.
name: Tschinkel, Walter R.
Publisher: name: FID GEO
Year: 2019

description: Numerical analysis of spatial pattern is widely used in ecology to describe the characteristics of floral and faunal distributions. These methods allow attribution of pattern to causal mechanisms by uncovering the specific signatures of patterns and causal agents. For example, grassland-gap patterns called fairy circles (FCs) in Namibia and Australia are characterized by highly regular and homogenous distributions across landscapes that show spatially periodic ordering. These FCs have been suggested to be caused by both social insects and competitive plant interactions. We compared eight Namibian and Australian FC patterns and also modeled FCs to 16 patterns of social insect nests in Africa, Australia, and America that include the most regular termite mound patterns known. For pattern-process inference, we used spatial statistics based on both nearest-neighbor analysis and neighborhood-density functions. None of the analyzed insect-nest distributions attain the spatially periodic ordering that is typical of FCs. The inherently more variable patterns of termite and ant nests are commonly attributable to well documented aspects of the faunal life-history. Our quantitative evidence from drylands shows that the more variable insect-nest distributions in water-limited environments cannot explain the characteristic spatial signature of FCs. The analysis demonstrates the interpretation of scale-dependent neighborhood-density functions and that it is the identification of unique spatial signatures in regular patterns that need to be linked to process. While our results cannot verify a specific hypothesis, they support the hypothesis that FCs in these drylands are more likely an emergent vegetation pattern caused by strong plant competition for water.
Nixonia stygica Johnson & Masner 2006
Creators: name: van Noort, Simon
name: Johnson, Norman
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Scelionidae
Nixonia
Nixonia stygica

description: Nixonia stygica Johnson & Masner, 2006 Distribution map available at: http://hol.osu.edu/index.html?id=184926 1 female, South Africa, Western Cape, Gamkaberg Nature Reserve, 33°39.941'S 21°53.505'E, 760m, 23.XII.2008 – 16.I.2009, S. van Noort, Malaise trap, GB09- SUC1-M01, Succulent Karoo/ Riverine vegetation ecotone, SAM-HYM-P030248, OSUC 256955 (SAMC).
description: Published as part of van Noort, Simon & Johnson, Norman, 2009, New species of the plesiomorphic genus Nixonia Masner (Hymenoptera, Platygastroidea, Platygastridae) from South Africa, pp. 31-51 in ZooKeys 20 (20) on page 48, DOI: 10.3897/zookeys.20.112, http://zenodo.org/record/576506
description: {"references": ["Johnson NF, Masner L (2006) Revision of world species of the genus Nixonia Masner (Hymenoptera: Platygastroidea, Scelionidae). American Museum Novitates 3518: 1 - 32."]}
Time-dependent V-representability on lattice systems
Creators: name: Li, Yonghui
name: Ullrich, C. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the mapping between time-dependent densities and potentials for noninteracting electronic systems on lattices. As discovered recently by Baer [J. Chem. Phys. 128, 044103 (2008)], there exist well-behaved time-dependent density functions on lattices which cannot be associated with any real time-dependent potential. This breakdown of time-dependent V-representability can be tracked down to problems with the continuity equation which arise from discretization of the kinetic-energy operator. Examples are given for lattices with two points and with N points, and implications for practical numerical applications of time-dependent density-functional theory are discussed. In the continuum limit, time-dependent noninteracting V-representability is restored.
description: 8 pages, 4 figures
Impact of Flow Alteration and Temperature Variability on Hyporheic Exchange
Creators: name: Wu, Liwen
name: Gomez-Velez, Jesus D.
name: Krause, Stefan
name: Singh, Tanu
name: Wörman, Anders
name: Lewandowski, Jörg
Publisher: name: FID GEO
Year: 2020

description: Coupled groundwater flow and heat transport within hyporheic zones extensively affect water, energy, and solute exchange with surrounding sediments. The local and cumulative implications of this tightly coupled process strongly depend on characteristics of drivers (i.e., discharge and temperature of the water column) and modulators (i.e., hydraulic and thermal properties of the sediment). With this in mind, we perform a systematic numerical analysis of hyporheic responses to understand how the temporal variability of river discharge and temperature affect flow and heat transport within hyporheic zones. We identify typical time series of river discharge and temperature from gauging stations along the headwater region of Mississippi River Basin, which are characterized by different degrees of flow alteration, to drive a physics-based model of the hyporheic exchange process. Our modeling results indicate that coupled groundwater flow and heat transport significantly affects the dynamic response of hyporheic zones, resulting in substantial differences in exchange rates and characteristic time scales of hyporheic exchange processes. We also find that the hyporheic zone dampens river temperature fluctuations increasingly with higher frequency of temperature fluctuations. This dampening effect depends on the system transport time scale and characteristics of river discharge and temperature variability. Furthermore, our results reveal that the flow alteration reduces the potential of hyporheic zones to act as a temperature buffer and hinders denitrification within hyporheic zones. These results have significant implications for understanding the drivers of local variability in hyporheic exchange and the implications for the development of thermal refugia and ecosystem functioning in hyporheic zones.
Controlled vortex core switching in a magnetic nanodisk by a rotating field
Creators: name: Kravchuk, Volodymyr P.
name: Sheka, Denis D.
name: Gaididei, Yuri
name: Mertens, Franz G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The switching process of the vortex core in a Permalloy nanodisk affected by a rotating magnetic field is studied theoretically. A detailed description of magnetization dynamics is obtained by micromagnetic simulations.
description: REVTeX, 5 pages, 5 figures
speckle-tracking: a software suite for ptychographic X-ray speckle tracking
Creators: name: Morgan, Andrew J.
name: Murray, Kevin T.
name: Quiney, Harry M.
name: Bajt, Saša
name: Chapman, Henry N.
Publisher: name: FID GEO
Year: 2020

description: In recent years, X-ray speckle-tracking techniques have emerged as viable tools for wavefront metrology and sample imaging applications. These methods are based on the measurement of near-field images. Thanks to their simple experimental setup, high angular sensitivity and compatibility with low-coherence sources, these methods have been actively developed for use with synchrotron and laboratory light sources. Not only do speckle-tracking techniques give the potential for high-resolution imaging, but they also provide rapid and robust characterization of aberrations of X-ray optical elements, focal spot profiles, and sample position and transmission properties. In order to realize these capabilities, software implementations are required that are equally rapid and robust. To address this need, a software suite has been developed for the ptychographic X-ray speckle-tracking technique, an X-ray speckle-based method suitable for highly divergent wavefields. The software suite is written in Python 3, with an OpenCL back end for GPU and multi-CPU core processing. It is accessible as a Python module, through the command line or through a graphical user interface, and is available as source code under Version 3 or later of the GNU General Public License.
title: État des connaissances sur l’utilisation de l’intelligence artificielle pour la réadaptation en physiothérapie des personnes atteintes d’accident vasculaire cérébral
title: scoping review
titleType: Subtitle
title: État des connaissances sur l’utilisation de l’intelligence artificielle pour la réadaptation en physiothérapie des personnes atteintes d’accident vasculaire cérébral
titleType: AlternativeTitle
Creators: name: Dénéréaz, Mélanie
name: Hautle, Julie
Publisher: name: Unknown
Year: 0
Subjects: subject: Accident vasculaire cérébral
subject: Réhabilitation
subject: Intelligence artificielle
subject: Apprentissage automatique
subject: Apprentissage profond
subject: Télé-réhabilitation
subject: Vision par ordinateur
subject: hesav TB Phy

description: Cadre Théorique : L’intelligence artificielle (IA), est une technologie en plein essor. Cependant, elle a des définitions variables et reste encore peu développée dans le domaine de la physiothérapie. L’accident vasculaire cérébral (AVC) touche près de 16 millions d’individus dans le monde chaque année (Béjot et al., 2009). C’est pourquoi ce travail a pour objectifs d’identifier et d’analyser les connaissances et les lacunes actuelles concernant l’IA, ainsi que de clarifier ses concepts et définitions clés dans le domaine de la réadaptation des personnes post-AVC. Méthode : Cette Scoping Review a retenu douze articles afin de traiter de la population (les adultes atteints d’AVC), du concept (l’IA comme moyen de traitement) et du contexte (dans le domaine de la réadaptation physiothérapeutique). Résultats : Il existe actuellement sept technologies présentant des systèmes d’IA pouvant être utilisées comme moyens de traitement pour cette population. À savoir la reconnaissance des gestes, la réalité virtuelle, la mHealth, les robots de rééducation, les jeux adaptatifs, ainsi que les interfaces neuronales directes (BCI). L’efficacité de certains systèmes d’IA est prometteuse. Ils peuvent permettre d’accélérer la réadaptation, d’améliorer les fonctions motrices, d’augmenter la motivation des participants, ainsi que de diminuer les coûts de traitements. Conclusion : Divers systèmes d’IA sont utilisés comme moyens de traitement adjuvants. Afin de pouvoir utiliser ces technologies dans la pratique, il serait intéressant d’étudier davantage l’efficacité de celles-ci en comparaison à des traitements conventionnels, de les perfectionner ainsi que de développer l’aspect éthique de ces technologies.
Origin of isolated seamounts in the Canary Basin (East Atlantic): The role of plume material in the origin of seamounts not associated with hotspot tracks
Creators: name: Long, Xiaojun
name: Geldmacher, Jörg
name: Hoernle, Kaj
name: Hauff, Folkmar
name: Wartho, Jo-Anne
name: Garbe-Schönberg, C.-Dieter
Publisher: name: FID GEO
Year: 2020

description: In contrast to seamount chains, small solitary seamounts/seamount groups have rarely been sampled despite their large number and therefore their origins remain enigmatic. Here we present new 40Ar/39Ar, trace element and Nd-Hf-Pb isotope data from the solitary Demenitskoy Seamount, the isolated Tolkien seamount group and the Krylov Seamount and Ridge in the Canary Basin, Central Atlantic Ocean. Their chemical compositions range from intraplate ocean-island-basalt (Demenitskoy) to mid-ocean-ridge-basalt (Tolkien and Krylov) types. Lavas from all three seamount groups, however, show geochemical evidence for involvement of enriched Canary/Cape Verde plume material. Seismic tomography shows that large areas around these mantle plumes consist of dispersed low-velocity material, which could represent diffusely-upwelling plume mantle. Melts from such upwelling mantle could form isolated seamounts. Diffuse upwelling of plume material is likely to be extremely widespread but has been poorly studied to date. Significance Statement A fundamental question concerns the origin of the hundreds of thousands of solitary seamounts and small isolated clusters of such seamounts on the seafloor of the world's ocean basins. Most of them do not fit into any currently accepted models (e.g. they are not associated with a linear hotspot track or plate boundary processes). Their formation could therefore represent a new kind of intraplate volcanism that in fact could be extremely widespread but has been thus far largely neglected. In this manuscript, we report geochemical data from three isolated seamount sites in the Canary Basin and propose a provocative model for their formation that can also be applied to isolated seamounts elsewhere. Our study is therefore also a plea for the long overdue systematic investigation of small seamount volcanism in the world's ocean basins. I hereby confirm that all the data and interpretations are new and have not been published elsewhere. All co-authors have been actively involved in this work, have approved the manuscript and agreed to this submission.
title: Компьютерные сети. L2-технологии
Creators: name: ELS IPR BOOKS
Publisher: name: Профобразование, Ай Пи Ар Медиа
Year: 2024

description: В издании показаны практические аспекты построения и настройки канального уровня вычислительной сети. Большое внимание уделено проблеме перехода на отечественное оборудование и программное обеспечение. В качестве платформы рассматривается отечественная операционная система, на базе ядра Linux. Это позволяет оказаться от дорогостоящего оборудования, в пользу локальных киберполигонов. Подробно рассмотрены технологии канального уровня: Базовые понятия сетевых технологий, технология Ethernet, VLAN, семейство протоколов STP, технологии агрегации каналов, SPAN, LLDP. В приложениях приведен справочный материал по основным инструментам развертывания киберполигона: ОС Альт, iproute2, GNS3, Open vSwitch, Docker и др. Подготовлен в соответствии с Федеральным государственным образовательным стандартом среднего профессионального образования. Практикум рекомендуется студентам укрупненной группы специальностей «Информатика и вычислительная техника», изучающим дисциплины «Организация, принципы построения и функционирования компьютерных сетей», «Компьютерные сети»; студентам укрупненной группы «Информационная безопасность», изучающим дисциплины «Эксплуатация информационно-телекоммуникационных систем и сетей», «Телекоммуникационные системы и сети», «Сети и системы передачи информации», «Эксплуатация компьютерных сетей»; студентам специальности «Инфокоммуникационные сети и системы связи», изучающим дисциплину «Монтаж и эксплуатация компьютерных сетей». Будет полезен практикующим специалистам в сфере компьютерных технологий.
An MHD Gadget for cosmological simulations
Creators: name: Dolag, K.
name: Stasyszyn, F. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Various radio observations have showed that the hot atmospheres of galaxy clusters are magnetized. However, our understanding of the origin of these magnetic fields, their implications on structure formation and their interplay with the dynamics of the cluster atmosphere, especially in the centers of galaxy clusters is still very limited. In preparation to the upcoming new generation of radio telescopes (like EVLA, LWA, LOFAR and SKA), a huge effort is being made to learn more about cosmological magnetic fields from the observational perspective. Here we present the implementation of magneto hydrodynamics in the cosmological SPH code GADGET. We discuss the details of the implementation and various schemes to suppress numerical instabilities as well as regularization schemes, in the context of cosmological simulations. The performance of the SPH MHD code is demonstrated in various one and two dimensional test problems, which we performed if a fully, three dimensional setup to test the code under realistic circumstances. Comparing with solutions obtained with ATHENA, we find excellent agreement with our SPH MHD implementation. Finally we apply our SPH MHD implementation to forming galaxy clusters within a large, cosmological box. Performing a resolution study we demonstrate the robustness of the predicted shape of the magnetic field profiles in galaxy clusters, which is in good agreement with previous studies.
description: Updated version, 21 pages, 21 figures, submitted to MNRAS
Efficiency and Accuracy of Micro-Macro Models for Mineral Dissolution
Creators: name: Gärttner, Stephan
name: Frolkovic, Peter
name: Knabner, Peter
name: Ray, Nadja
Publisher: name: FID GEO
Year: 2020

description: Micro-macro models for dissolution processes are derived from detailed pore-scale models applying upscaling techniques. They consist of flow and transport equations at the scale of the porous medium (macroscale). Both include averaged time- and space-dependent coefficient functions (permeability, porosity, reactive surface, and effective diffusion). These are in turn explicitly computed from the time- and space-dependent geometry of unit cells and by means of auxiliary cell problems defined therein (microscale). The explicit geometric structure is characterized by a level set. For its evolution, information from the transport equations solutions is taken into account (micro-macro scales). A numerical scheme is introduced, which is capable of evaluating such complex settings. For the level-set equation a second-order scheme is applied, which enables us to accurately determine the dynamic reactive surface. Local mesh refinement methods are applied to evaluate Stokes type cell problems using P2/P1 elements and a Uzawa type linear solver. Applications of our permeability solver to scenarios involving static and evolving geometries are presented. Furthermore, macroscopic flow and transport equations are solved applying mixed finite elements. Finally, adaptive strategies to overcome the computational burden are discussed. We apply our approach to the dissolution of an array of dolomite grains in the micro-macro context and validate our numerical scheme.
The role of symmetries in adiabatic quantum algorithms
Creators: name: Schaller, Gernot
name: Schützhold, Ralf
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Exploiting the similarity between adiabatic quantum algorithms and quantum phase transitions, we argue that second-order transitions -- typically associated with broken or restored symmetries -- should be advantageous in comparison to first-order transitions. Guided by simple examples we construct an alternative adiabatic algorithm for the NP-complete problem {\em Exact Cover 3}. We show numerically that its average performance (for the considered cases up to ${\cal O}\{20\}$ qubits) is better than that of the conventional scheme. The run-time of adiabatic algorithms is not just determined by the minimum value of the fundamental energy gap (between the ground state and the exited states), but also by its curvature at the critical point. The proposed symmetry-restoring adiabatic quantum algorithm only contains contributions linear and quadratic in the Pauli matrices and can be generalized to other problem Hamiltonians which are decomposed of terms involving one and two qubits. We show how the factoring problem can be cast into such a quadratic form. These findings suggest that adiabatic quantum algorithms can solve a large class of NP problems much faster than the Grover search routine (which corresponds to a first-order transition and yields a quadratic enhancement only).
description: 18 pages, 16 figures, 4 tables; some reviewer suggestions included, comments welcome
ЛИНГВОДИДАКТИЧЕСКАЯ ИНТЕРПРЕТАЦИЯ СЕМАНТИКИ  ГЛАГОЛОВ РУССКОГО ЯЗЫКА ТИПА «ПОБУДИТЬ КОГО-ЛИБО К КАКОМУ-ЛИБО ДЕЙСТВИЮ ИЛИ ДЕЯТЕЛЬНОСТИ»
Creators: name: Хайдарова Зульфия Турсунходжаевна кандидат педагогических наук, доцент кафедры педагогики, психологии и общеобразовательных дисциплин Университета «Инновационных Технологий Шелкового Пути». г. Алмалык, Узбекистан
Publisher: name: Zenodo
Year: 2024

description: В данной статье предлагается лингводидактическая  интерпретация семантики класса глаголов типа «побудить кого-либо к какому-либо действию или деятельности», на основе дистрибутивно-трансформационного и компонентного анализа в не русскоязычной  аудитории.

Ключевые слова: актант, дистрибуция, интерпретация, лексема, объект, предикат, семантика, субъект, трансформация.
Field and Temperature Dependence of the Superfluid Density in LaO_{1-x}F_xFeAs Superconductors: A Muon Spin Relaxation Study
Creators: name: Luetkens, H.
name: Klauss, H. -H.
name: Khasanov, R.
name: Amato, A.
name: Klingeler, R.
name: Hellmann, I.
name: Leps, N.
name: Kondrat, A.
name: Hess, C.
name: Köhler, A.
name: Behr, G.
name: Werner, J.
name: Büchner, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present zero field and transverse field \muSR experiments on the recently discovered electron doped Fe-based superconductor LaO_{1-x}F_xFeAs. The zero field experiments on underdoped (x=0.075) and optimally doped (x=0.1) samples rule out any static magnetic order above 1.6 K in these superconducting samples. From transverse field experiments in the vortex phase we deduce the temperature and field dependence of the superfluid density. Whereas the temperature dependence is consistent with a weak coupling BCS s-wave or a dirty d-wave gap function scenario, the field dependence strongly evidences unconventional superconductivity. We obtain the in-plane penetration depth of λ_{ab} (0) = 254(2)nm for LaO_{0.9}F_{0.1}FeAs and λ_{ab} (0) = 364(8)nm for LaO_{0.925}F_{0.075}FeAs. Further evidence for unconventional superconductivity is provided by the ratio of T_c versus the superfluid density, which is close to the Uemura line of hole doped high-T_c cuprates.
description: 5 pages, 5 figures
Understanding & Predicting User Lifetime with Machine Learning in an Anonymous Location-Based Social Network
Creators: name: Reelfs, Jens Helge
name: Bergmann, Max
name: Hohlfeld, Oliver
name: Henckell, Niklas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this work, we predict the user lifetime within the anonymous and location-based social network Jodel in the Kingdom of Saudi Arabia. Jodel's location-based nature yields to the establishment of disjoint communities country-wide and enables for the first time the study of user lifetime in the case of a large set of disjoint communities. A user's lifetime is an important measurement for evaluating and steering customer bases as it can be leveraged to predict churn and possibly apply suitable methods to circumvent potential user losses. We train and test off the shelf machine learning techniques with 5-fold crossvalidation to predict user lifetime as a regression and classification problem; identifying the Random Forest to provide very strong results. Discussing model complexity and quality trade-offs, we also dive deep into a time-dependent feature subset analysis, which does not work very well; Easing up the classification problem into a binary decision (lifetime longer than timespan $x$) enables a practical lifetime predictor with very good performance. We identify implicit similarities across community models according to strong correlations in feature importance. A single countrywide model generalizes the problem and works equally well for any tested community; the overall model internally works similar to others also indicated by its feature importances.
description: To appear at the WWW'21 LocWeb Workshop
title: Компьютерные сети. L2-технологии
Creators: name: ELS IPR BOOKS
Publisher: name: Ай Пи Ар Медиа
Year: 2024

description: В издании изложены практические аспекты построения и настройки канального уровня вычислительной сети. Большое внимание уделено проблеме перехода на отечественное оборудование и программное обеспечение. В качестве платформы рассматривается отечественная операционная система на базе ядра Linux. Это позволяет отказаться от дорогостоящего оборудования в пользу локальных киберполигонов. Подробно рассмотрены технологии канального уровня, базовые понятия сетевых технологий, технология Ethernet, VLAN, семейство протоколов STP, технологии агрегации каналов, SPAN, LLDP. В приложениях приведен справочный материал по основным инструментам развертывания киберполигона: ОС Альт, iproute2, GNS3, Open vSwitch, Docker и др. Подготовлен в соответствии с Федеральным государственным образовательным стандартом высшего образования. Практикум рекомендуется для использования в качестве основной литературы по дисциплинам, посвященным сетевым технологиям, укрупненной группы специальностей и направлений подготовки высшего образования «Информатика и вычислительная техника», «Информационная безопасность» и «Электроника, радиотехника и системы связи».
Non-Metric Gravity II: Spherically Symmetric Solution, Missing Mass and Redshifts of Quasars
Creators: name: Krasnov, Kirill
name: Shtanov, Yuri
Publisher: name: arXiv
Year: 2007
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 continue the study of the non-metric theory of gravity introduced in hep-th/0611182 and gr-qc/0703002 and obtain its general spherically symmetric vacuum solution. It respects the analog of the Birkhoff theorem, i.e., the vacuum spherically symmetric solution is necessarily static. As in general relativity, the spherically symmetric solution is seen to describe a black hole. The exterior geometry is essentially the same as in the Schwarzschild case, with power-law corrections to the Newtonian potential. The behavior inside the black-hole region is different from the Schwarzschild case in that the usual spacetime singularity gets replaced by a singular surface of a new type, where all basic fields of the theory remain finite but metric ceases to exist. The theory does not admit arbitrarily small black holes: for small objects, the curvature on the would-be horizon is so strong that non-metric modifications prevent the horizon from being formed. The theory allows for modifications of gravity of very interesting nature. We discuss three physical effects, namely, (i) correction to Newton's law in the neighborhood of the source, (ii) renormalization of effective gravitational and cosmological constants at large distances from the source, and (iii) additional redshift factor between spatial regions of different curvature. The first two effects can be responsible, respectively, for the observed anomaly in the acceleration of the Pioneer spacecraft and for the alleged missing mass in spiral galaxies and other astrophysical objects. The third effect can be used to propose a non-cosmological explanation of high redshifts of quasars and gamma-ray bursts.
description: 39 pages, 2 figures, text slightly extended, references added
Territorial Impact Assessment of Territorial Cohesion in Italy and Europe (Roma, 11-12 aprile 2019)
Creators: name: Pigliucci, Michele
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: L’11 e 12 aprile 2019 si è svolta, presso la Facoltà di Economia dell’Università degli Studi di Roma Tor Vergata, la Conferenza Internazionale “Territorial Impact Assessment of Territorial Cohesion in Italy and Europe”. L’evento, che ha visto la partecipazione di ricercatori e policy/decision maker stranieri e nazionali, ha avuto lo scopo di presentare – in un dibattito di grande rilievo scientifico – i primi risultati emersi nell’ambito del Progetto di ricerca di interesse nazionale (PRIN 2015) guidato dal principal investigator (di seguito PI) Maria Prezioso, dal titolo “Territorial Impact Assessment-TIA della coesione territoriale delle regioni italiane. Modello, su base place evidence, per la valutazione di policy rivolte allo sviluppo della green economy in aree interne e periferie metropolitane”.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
Limits on spin-dependent WIMP-nucleon cross-sections from the first ZEPLIN-II data
Creators: name: al., G. J. Alner et
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The first underground data run of the ZEPLIN-II experiment has set a limit on the nuclear recoil rate in the two-phase xenon detector for direct dark matter searches. In this paper the results from this run are converted into the limits on spin-dependent WIMP-proton and WIMP-neutron cross-sections. The minimum of the curve for WIMP-neutron cross-section corresponds to 0.07 pb at a WIMP mass of around 65 GeV.
description: 12 pages, 2 figures, to be published in Physics Letters B
Gaudin Models and Multipoint Conformal Blocks II: Comb channel vertices in 3D and 4D
Creators: name: Buric, Ilija
name: Lacroix, Sylvain
name: Mann, Jeremy A.
name: Quintavalle, Lorenzo
name: Schomerus, Volker
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: It was recently shown that multi-point conformal blocks in higher dimensional conformal field theory can be considered as joint eigenfunctions for a system of commuting differential operators. The latter arise as Hamiltonians of a Gaudin integrable system. In this work we address the reduced fourth order differential operators that measure the choice of 3-point tensor structures for all vertices of 3- and 4-dimensional comb channel conformal blocks. These vertices come associated with a single cross ratio. Remarkably, we identify the vertex operators as Hamiltonians of a crystallographic elliptic Calogero-Moser-Sutherland model that was discovered originally by Etingof, Felder, Ma and Veselov. Our construction is based on a further development of the embedding space formalism for mixed-symmetry tensor fields. The results thereby also apply to comb channel vertices of 5- and 6-point functions in arbitrary dimension.
description: 67 pages, 4 figures, v2: published version, inaccuracies corrected, figure and tables added, two Mathematica notebooks added
"Saperi per la narrazione. Storia e geografia nella costruzione dell'Italia unita" di Paola Pressenda, Paola Sereno (a cura di)
Creators: name: Cerreti, Claudio
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: Un attento lavoro di selezione e coordinamento ha portato a confezionare un eccellente volume, che fa davvero onore alle curatrici come agli autori dei saggi raccolti, in linea con le alte tradizioni dell’editore fiorentino.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
IFU observations of the GRB 980425/SN 1998bw host galaxy: emission line ratios in GRB regions
Creators: name: Christensen, L.
name: Vreeswijk, P. M.
name: Sollerman, J.
name: Thoene, C. C.
name: Floc'h, E. Le
name: Wiersema, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The collapsar model predicts that the progenitors of Gamma-ray Bursts (GRBs) are metal poor in Fe group elements. The existence of low metallicity stellar populations could manifest itself through special characteristics of the immediate environment of the GRB site in the host galaxy. We analyse the strong emission lines from the sub-luminous host galaxy of GRB 980425, which showed the first connection with a supernova explosion (SN 1998bw). The host has a sufficient size to allow detailed resolved spectroscopy of individual HII regions and to look for regions with special properties close to the the GRB site. Using integral field spectroscopy with VIMOS we cover most of the high surface brightness part of the host including the HII region where the supernova and GRB occurred. The star formation rate, reddening, equivalent width and stellar mass in the GRB region is similar to other HII regions in the host. Extreme values arise in the only region that shows emission lines from Wolf-Rayet stars; a region that lies 800 pc in projection from the GRB site. Strong emission line diagnostics of all HII regions imply oxygen abundances between 0.3 and 0.8 solar with the lowest values arising in the WR and GRB regions. Comparing the measured emission line ratios for a sample of low redshift GRB hosts to theoretical models and to observations of field galaxies, we find that GRBs arise in a range of metallicity environments while the regions are consistently very young. The similar line ratios of GRB hosts compared to the WR region can arise in spatially unresolved galaxies with bright HII regions near the GRB location. (Abridged)
description: 16 pages, 10 figures. Accepted for publication in A&A. Typos corrected