cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Embodied Synaptic Plasticity with Online Reinforcement learning
Creators: name: Kaiser, Jacques
name: Hoff, Michael
name: Konle, Andreas
name: Tieck, J. Camilo Vasquez
name: Kappel, David
name: Reichard, Daniel
name: Subramoney, Anand
name: Legenstein, Robert
name: Roennau, Arne
name: Maass, Wolfgang
name: Dillmann, Rudiger
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The endeavor to understand the brain involves multiple collaborating research fields. Classically, synaptic plasticity rules derived by theoretical neuroscientists are evaluated in isolation on pattern classification tasks. This contrasts with the biological brain which purpose is to control a body in closed-loop. This paper contributes to bringing the fields of computational neuroscience and robotics closer together by integrating open-source software components from these two fields. The resulting framework allows to evaluate the validity of biologically-plausibe plasticity models in closed-loop robotics environments. We demonstrate this framework to evaluate Synaptic Plasticity with Online REinforcement learning (SPORE), a reward-learning rule based on synaptic sampling, on two visuomotor tasks: reaching and lane following. We show that SPORE is capable of learning to perform policies within the course of simulated hours for both tasks. Provisional parameter explorations indicate that the learning rate and the temperature driving the stochastic processes that govern synaptic learning dynamics need to be regulated for performance improvements to be retained. We conclude by discussing the recent deep reinforcement learning techniques which would be beneficial to increase the functionality of SPORE on visuomotor tasks.
description: 18 pages, 5 figures, published in frontiers in neurorobotics
title: Türen: Zwischen gesetzlichen Vorschriften und realitätskonformer Ausführung
Creators: name: Hangelmann, Michael
Publisher: name: TU Wien
Year: 2017
Subjects: subject: Tür
subject: Barrierefreiheit
subject: Brandschutz
subject: Fluchtweg
subject: Öffnungskräfte
subject: Wärmeschutz
subject: Schallschutz

description: Das persönliche Ziel des Autors ist, sich intensiv mit den gesetzlichen Vorschriften und Richtlinien rund um den Bauteil Tür auseinanderzusetzen, um auf eine realitätskonforme Ausführung schließen zu können. Hierzu wird nach einleitenden Worten zu Beginn auf Grundlagen, Definitionen und Terminologie eingegangen, welche notwendig sind um in die tiefere Literatur einzusteigen. Anschließend werden die Funktionen und Anforderungen welche auf Türen einwirken beschrieben und mit gesetzlichen Vorschriften und Richtlinien hinterlegt. Um diese Vorschriften und Richtlinien in der Realität zu veranschaulichen wurde ein Objekt der Universität für Musik und darstellende Kunst Wien gewählt. Neben den allgemeinen gesetzlichen Rahmenbedingungen, in welche im Vorfeld eingegangen wird, kommen im Fallbeispiel noch projektspezifische Rahmenbedingungen wie der Baubescheid, das Brandschutzkonzept und das Fluchtwegkonzept hinzu. Anhand der allgemeinen Rahmenbedingungen und der projektspezifischen Rahmenbedingungen wird ein Kriterienkatalog erstellt mit welchem es zu untersuchen gilt, ob die untersuchten Türen diesen Anforderungen entsprechen. Im Anschluss der Analyse der einzelnen Türen kommt es zu einer ausgewerteten Zusammenfassung und Interpretierung. Die vom Autor erstellten Hypothesen dieser Arbeit, sowie die zentrale Fragestellung konnten beantwortet werden.
description: This research project is a critical examination of legal regulations related to the practical application of doors as crucial building components. The introductory chapters provide a literature-based review of principles, definitions and terminologies. It is followed by an overview of the functions and requirements of doors and its role in legal discourse. How legal regulations and guidelines influence these functions and requirements is exemplified by a case study of a property of The University of Music and Performing Arts, Vienna. Despite general legal requirements, the case study examines project-specific requirements such as the proof of construction, the fire protection concept and the escape route concept. Based on the general and project-specific requirements, a set of criteria was developed, in order to investigate if the doors of the case study meet the identified criteria. The final section presents a summary, interpretation and conclusion of the research that revealed support for the stated hypothesis.
Novel oseltamivir-resistant mutations distant from the active site of influenza B neuraminidase
Creators: name: Kato, Yusuke
name: Takahashi, Kazuhiro
name: Fuyu Ito
name: Suzuki, Shoichi
name: Fukui, Kiyoshi
name: Mimaki, Masakazu
name: Suzuki, Kazuo
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Evolutionary Biology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: Computational Biology

description: We performed a neuraminidase sequence analysis of thirty-two pediatric patients with influenza B who visited Teikyo University Hospital from January 2016 to March 2017, and found oseltamivir-resistant samples belonging to the Yamagata and Victoria lineages. Comparison with the neuraminidase sequence of oseltamivir-susceptible B/Brisbane/60/2008 revealed 5 common amino acid substitutions in many of these samples. According to the binding free energy calculation, the N340D and E358K substitutions reduced the affinity of oseltamivir to neuraminidase. Unexpectedly, these substitutions were located distant from the oseltamivir-binding site in neuraminidase. According to the molecular dynamics simulations, the N340D substitution rearranged complicated hydrogen bond networks in an extensive surface region of neuraminidase. The E358K substitution extensively altered the electrostatic potential map of the overall neuraminidase structure. Through these novel mechanisms, the N340D and E358K substitutions indirectly influenced the affinity reduction. These results may be useful for designing drugs for the treatment of oseltamivir-resistant virus infections.
Ações coletivas envolvendo pequenos produtores: da exclusão à inclusão nos mercados
Creators: name: Lourenzani, Ana Elisa Bressan Smith
name: Silva, Andrea Lago Da
name: Lourenzani, Ana Elisa Bressan Smith
name: Silva, Andrea Lago Da
Publisher: name: Unknown
Year: 2006
Subjects: Agribusiness
Production Economics

description: A busca por eficiência frente à crescente importância do agronegócio tem provocado processos de exclusão de pequenos produtores rurais. De forma a oferecer produtos em conformidade com os padrões desenvolvidos pelas grandes redes de auto-serviço, os fornecedores tiveram que se adaptar a exigências como qualidade, regularidade no fornecimento, escala mínima de fornecimento, preço e agilidade logística. No entanto, observa-se que essas mudanças se refletiram, de forma bastante abrupta, nos pequenos produtores rurais, representando desafios e até mesmo exclusão de pequenos produtores rurais em toda a América Latina. Estes se mostraram incapazes de atender às novas demandas do mercado devido às características intrínsecas à pequena unidade de produção. Essa situação aumentou o risco de ocorrência de processos de exclusão de pequenos produtores da atividade agrícola. Uma possibilidade que se apresenta é a adoção de ações coletivas, buscando garantir a inserção destes produtores no processo de aquisição de produtos das grandes redes varejistas e de outros importantes canais de distribuição. Dessa forma, torna-se relevante analisar as exigências impostas pelos diferentes canais de distribuição e a capacidade de resposta de pequenos empreendimentos agrícolas que atuam de forma colaborativa com outros agentes do mesmo elo (horizontalmente) e em parceria com elos a montante ou a jusante (verticalmente). Nesse contexto, essa pesquisa teve como objetivo efetuar recomendações que permitissem a inserção de pequenos produtores em canais de distribuição. Para tal, foram identificados pontos de alavancagem no processo de estabelecimento e manutenção de ações coletivas visando o acesso a mercados.
Demanda por Pescados no Brasil entre 2002 e 2003
Creators: name: Shirota, Ricardo
name: Sonoda, Daniel Yokoyama
name: Shirota, Ricardo
name: Sonoda, Daniel Yokoyama
Publisher: name: Unknown
Year: 2006
Subjects: Agribusiness
Demand and Price Analysis

description: O Brasil é um país que possui baixo consumo per capita de pescados. Alguns dos fatores que explicam este fenômeno estão ligados à sua oferta como por exemplo: a sobre pesca, a baixa produção nacional, a distância entre centros produtores e consumidores etc. Este trabalho, porém, aborda as questões ligadas à demanda de pescados no Brasil. Inicialmente, procuro-se caracterizar a problemática da oferta de pescados no Brasil, descreveu-se o método de cálculo da função demanda desenvolvido por Deaton e Muelbauer (1980), o Almost Ideal Demand System (AIDS), a partir dos microdados da Pesquisa de Orçamento Familiar (POF) 2002-2003, em seguida fez-se uma breve análise descritiva da demanda por pescados no Brasil e finalmente estimou-se uma função demanda por pescados no Brasil para a qual se considerou apenas o subgrupo proteína animal para o cálculo. Os principais resultados apontam que o consumo per capita de pescados é baixo porque poucos brasileiros consomem pescados. O padrão de consumo de pescado das Regiões Norte e Nordeste diferem do padrão de consumo das Regiões do Centro- Sul do país. Os principais produtos substitutos aos pescados no país são as proteínas mais elaboradas e não as carnes mais tradicionais como a de aves e as vermelhas. O principal desafio para o setor seria de inserir os pescados no hábito alimentar do brasileiro. Algumas alternativas poderiam ser sugeridas: o aumento da oferta natural de pescados e sua redução de seu preço e/ou a produção de pescados a baixo custo em confinamento; e o desenvolvimento de produtos a base de pescados mais elaborados para competir no mercado de proteínas prontas.
On Dominant Interference in Random Networks and Communication Reliability
Creators: name: Liu, Dong
name: Cavarec, Baptiste
name: Rasmussen, Lars K.
name: Yue, Jing
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we study the characteristics of dominant interference power with directional reception in a random network modelled by a Poisson Point Process. Additionally, the Laplace functional of cumulative interference excluding the $n$ dominant interferers is also derived, which turns out to be a generalization of omni-directional reception and complete accumulative interference. As an application of these results, we study the impact of directional receivers in random networks in terms of outage probability and error probability with queue length constraint.
La condicion inmigrante de los nuevos trabajadores rurales
Creators: name: Pedreno Canovas, Andres
name: Requelme Perea, Prudencio J.
name: Pedreno Canovas, Andres
name: Requelme Perea, Prudencio J.
Publisher: name: Unknown
Year: 2006
Subjects: subject: Community/Rural/Urban Development
subject: Labor and Human Capital
subject: Mercados de trabajo rurales
subject: trabajadores inmigrantes
subject: segmentacion
subject: reestructuracion rural
subject: rural labour markets
subject: immigrants workers
subject: segmentation
subject: rural restructuring

description: Este articulo explora la cuestion del uso de trabajadores inmigrantes en mercados de trabajo segmentados propios del capitalism flexible en areas rurales. Los Estudios Rurales han contribuido al studio de los mercados de trabajo desde la perspectiva de su relacion con el espacio. En el texto se enfatiza el rol de estos procesos espaciales en la vinculacion entre trabajadores inmigrantes y segmentacion de los mercados de trabajo en areas rurales. Para ello se utiliza una perspectiva teorica que integra los conceptos de clase, etnicidad es un factor clave de vulnerabilidad en la nueva economia rural y sus mercados de trabajo. Los trabajores inmigrantes son a menudo concentrados en regions rurales que conforman historias de extreme estratificacion de clase y ausencia de derechos politicos creadas por formas de discrimincacion y explotacion tanto legales como extralegales...This article explores the use of immigrant workers in segmented labor markets typical of flexible capitalism in rural areas. Rural Studies have contributed a perspective of spatial entrapment and spatially contingent job markets. We emphasize supply-side processes and the role of these processes in the linkage between immigrant workers and labour markets segmentation in rural areas. We develop this argument by integratin conceptualizations of class, ethnicity, gender and the experience of place. Finally, we show how ethnicity is a key factor of vulnerability in the new rural economy and its labour markets. Immigrant workers are often concentrated in rural regions that share histories of extreme class stratification and political disenfranchisement created by both legal and extra-legal discrimination and exploitation.
Escort density operators and generalized quantum information measures
Creators: name: Naudts, Jan
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Parametrized families of density operators are studied. A generalization of the lower bound of Cramer and Rao is formulated. It involves escort density operators. The notion of phi-exponential family is introduced. This family, together with its escort, optimizes the generalized lower bound. It also satisfies a maximum entropy principle and exhibits a thermodynamic structure in which entropy and free energy are related by Legendre transform.
description: 10 pages
title: 01_1180
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Phase stability analysis in Fe-Pt and Co-Pt alloy systems: An augmented space study
Creators: name: Paudyal, Durga
name: Saha-Dasgupta, Tanusri
name: Mookerjee, Abhijit
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have studied the problem of phase stability in Fe-Pt and Co-Pt alloy systems. We have used the orbital peeling technique in the conjunction of augmented space recursion based on the tight binding linear orbital method as the method for the calculation of pair interaction energies. In particular, we have generalized our earlier technique to take into account of magnetic effects for the cases where the magnetic transition is higher than the order disorder chemical transition temperature as in the case of Co$_3$Pt. Our theoretical results obtained within this framework successfully reproduce the experimentally observed trends.
description: 17 pages, 9 Figures. Accepted for publication in Journal of Physics : Condensed Matter
Stochastic Calibration of Radio Interferometers
Creators: name: Yatawatta, Sarod
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Artificial Intelligence (cs.AI)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: With ever increasing data rates produced by modern radio telescopes like LOFAR and future telescopes like the SKA, many data processing steps are overwhelmed by the amount of data that needs to be handled using limited compute resources. Calibration is one such operation that dominates the overall data processing computational cost, nonetheless, it is an essential operation to reach many science goals. Calibration algorithms do exist that scale well with the number of stations of an array and the number of directions being calibrated. However, the remaining bottleneck is the raw data volume, which scales with the number of baselines, and which is proportional to the square of the number of stations. We propose a 'stochastic' calibration strategy where we only read in a mini-batch of data for obtaining calibration solutions, as opposed to reading the full batch of data being calibrated. Nonetheless, we obtain solutions that are valid for the full batch of data. Normally, data need to be averaged before calibration is performed to accommodate the data in size-limited compute memory. Stochastic calibration overcomes the need for data averaging before any calibration can be performed, and offers many advantages including: enabling the mitigation of faint radio frequency interference; better removal of strong celestial sources from the data; and better detection and spatial localization of fast radio transients.
description: MNRAS Accepted 2020 March 2. Received 2020 March 2 ; in original form 2020 January 27
Matter-antimatter asymmetry without departure from thermal equilibrium
Creators: name: Carmona, José Manuel
name: Cortés, José Luis
name: Das, Ashok
name: Gamboa, Jorge
name: Méndez, Fernando
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore the possibility of baryogenesis without departure from thermal equilibrium. A possible scenario is found, though it contains strong constraints on the size of the $CPT$ violation ($CPTV$) effects and on the role of the $B$ (baryon number) nonconserving interactions which are needed for it.
description: Revtex, 4pages
Fitting random cash management models to data
Creators: name: Salas-Molina, Francisco
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computational Finance (q-fin.CP)
subject: FOS: Economics and business
subject: 68T01, 91B28

description: Organizations use cash management models to control balances to both avoid overdrafts and obtain a profit from short-term investments. Most management models are based on control bounds which are derived from the assumption of a particular cash flow probability distribution. In this paper, we relax this strong assumption to fit cash management models to data by means of stochastic and linear programming. We also introduce ensembles of random cash management models which are built by randomly selecting a subsequence of the original cash flow data set. We illustrate our approach by means of a real case study showing that a small random sample of data is enough to fit sufficiently good bound-based models.
description: 19 pages,6 figures, 1 table
Cmabios generacionales en las estrategias de insercion socialaboral de las jovenes rurales
Creators: name: Mendez, Cecilia Diaz
name: Mendez, Cecilia Diaz
Publisher: name: Unknown
Year: 2006
Subjects: subject: Community/Rural/Urban Development
subject: International Relations/Trade
subject: Insercion laboral rural
subject: mujer y empleo
subject: genero y ruralidad
subject: rural laboring insertion
subject: rural women and employment
subject: gender and rurality

description: A lo largo de los ultimos veinte anos el medio rural espanol ha visto modificar significativamente la vida de sis pobladores. Las mujeres, en particular las jovenes, han tomado orietatciones personales y laborales propias para situarse socialmente en un mundo rural en proceso de cambio. Las strategies de insercion adoptadas al final del siglo veinte por las mujeres mas jovenes han diferido de las de sus coetaneos varones primando aquellas la marcha del territoria a traves de los estudios como alternative a un medio rural con escasas oportunidades para ellas. En esta epoca les asemeja, sin embargo, un mismo origen aroganadero y la adopcion de estrategias mas familiars que individuales. En el Nuevo siglo las mujeres tambien actuan de modo diferente a los varones; unas continuan prefieriendo el exodo como via de insercion social y laboral, otras se aferran al territorio en busca de una nueva identidad simbolica de la ruralidad. Con estas estrategias cambiantes nos estan mostrando las diferentes formas de afrontar el cambio en el medio rural por parte de un colectivo particularmente desfavorecido en este complejo proceso de cambio social...In the last few years the rural environment in Spain has seen many important changes in the lives of its inhabitants. Women, especially young women, have made their own personal and professional decisions in order to get their own social status in a rural world which is undergoing continuous change. The insertion strategies followed by younger women in the last decades of the 20th century differed from the ones followed by their contemporary men. Young women gave priority to education, even though that meant having to leave their rural areas, which have never had many opportunities for them. However, nowadays they are similar to previous generations in that most of them come from families of farmers and cattle breeders, and in that they are making decisions based on family reasons rather than individual ones. In this new century women also behave differently from men: some of them prefer the exodus from their environment as a way of social and laboring insertion, while others hand on to their territory in search of some new symbolic identity of rurality. Through these changing strategies this particularly underprivileged group is presenting a different way of facing this complex process of social change in the rural world.
Induced Operators in QCD
Creators: name: McCartor, G.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Light-cone quantization always involves the solution of differential constraint equations. The solutions to these equations include integration constants (fields independent of $x_-$). These fields are unphysical but when they are consistently removed from the dynamics, additional operators (induced operators), which would not be present if the integration constants were simply set to zero, are included in the dynamics. These induced operators can be taken to act in the usual light-cone subspace, for instance, the space used for DLCQ. Here, I shall give a derivation of two such operators. The operators are derived starting from the QCD Lagrangian but the derivation involves some guesses. The operators will provide for the linear growth of the pion mass squared with the quark bare mass and for the splitting of the pi and the rho at zero quark mass.
description: 8 pages. Talk presented at Light-Cone 2004 at the VU Amsterdam
Coherent topological polariton laser
Creators: name: Harder, Tristan H.
name: Sun, Meng
name: Egorov, Oleg A.
name: Vakulchyk, Ihor
name: Beierlein, Johannes
name: Gagel, Philipp
name: Emmerling, Monika
name: Schneider, Christian
name: Peschel, Ulf
name: Savenko, Ivan G.
name: Klembt, Sebastian
name: Höfling, Sven
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Topological concepts have been applied to a wide range of fields in order to successfully describe the emergence of robust edge modes that are unaffected by scattering or disorder. In photonics, indications of lasing from topologically protected modes with improved overall laser characteristics were observed. Here, we study exciton-polariton microcavity traps that are arranged in a one-dimensional Su-Schrieffer-Heeger lattice and form a topological defect mode from which we unequivocally observe highly coherent polariton lasing. Additionally, we confirm the excitonic contribution to the polariton lasing by applying an external magnetic field. These systematic experimental findings of robust lasing and high temporal coherence are meticulously reproduced by a combination of a generalized Gross-Pitaevskii model and a Lindblad master equation model. Thus, by using the comparatively simple SSH geometry, we are able to describe and control the exciton-polariton topological lasing, allowing for a deeper understanding of topological effects on microlasers.
description: 25 pages, 6 figures
Reflection-asymmetric wormholes and their double shadows
Creators: name: Wielgus, Maciek
name: Horak, Jiri
name: Vincent, Frederic
name: Abramowicz, Marek
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We discuss construction and observational properties of wormholes obtained by connecting two Reissner-Nordstrom spacetimes with distinct mass and charge parameters. These objects are spherically symmetric, but not reflection-symmetric, as the connected spacetimes differ. The reflection-asymmetric wormholes may reflect a significant fraction of the infalling radiation back to the spacetime of its origin. We interpret this effect in a simple framework of the effective photon potential. Depending on the model parameters, image of such a wormhole seen by a distant observer (its "shadow") may contain a photon ring formed on the observer's side, photon ring formed on the other side of the wormhole, or both photon rings. These unique topological features would allow us to firmly distinguish this class of objects from Kerr black holes using radioastronomical observations.
description: 9 pages, accepted in Phys. Rev. D
Lagrangian submanifolds and dynamics on Lie algebroids
Creators: name: de Leon, Manuel
name: Marrero, Juan C.
name: Martinez, Eduardo
Publisher: name: arXiv
Year: 2004
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B66, 53D12, 70G45, 70H03, 70H05, 70H20

description: In some previous papers, a geometric description of Lagrangian Mechanics on Lie algebroids has been developed. In the present paper, we give a Hamiltonian description of Mechanics on Lie algebroids. In addition, we introduce the notion of a Lagrangian submanifold of a symplectic Lie algebroid and we prove that the Lagrangian (Hamiltonian) dynamics on Lie algebroids may be described in terms of Lagrangian submanifolds of symplectic Lie algebroids. The Lagrangian (Hamiltonian) formalism on Lie algebroids permits to deal with Lagrangian (Hamiltonian) functions not defined necessarily on tangent (cotangent) bundles. Thus, we may apply our results to the projection of Lagrangian (Hamiltonian) functions which are invariant under the action of a symmetry Lie group. As a consequence, we obtain that Lagrange-Poincare (Hamilton-Poincare) equations are the Euler-Lagrange (Hamilton) equations associated with the corresponding Atiyah algebroid. Moreover, we prove that Lagrange-Poincare (Hamilton-Poincare) equations are the local equations defining certain Lagrangian submanifolds of symplectic Atiyah algebroids.
How Situational Awareness Informs Cybersecurity Operations
Creators: name: Richmond, Nathaniel
Publisher: name: Carnegie Mellon University
Year: 2021
Subjects: subject: 80303 Computer System Security
subject: FOS: Computer and information sciences

description: Cybersecurity operations are applied principles, processes, and technologies that defend an information environment against threats. Situational Awareness (SA) helps decision makers throughout an organization have the information and understanding they need to make sound decisions about cybersecurity operations as they defend their organizations from the increasingly dangerous cyber threats that are prevalent today.
Enfoque dual de descuento para tangibles e intangibles: una propuesta metodologica aplicada a la Restuaracion de Cuencas
Creators: name: Almansa Saez, Carmen
name: Calatrava-Requena, Javier
name: Almansa Saez, Carmen
name: Calatrava-Requena, Javier
Publisher: name: Unknown
Year: 2006
Subjects: subject: Environmental Economics and Policy
subject: Financial Economics
subject: Evaluacion economica
subject: analisis coste-beneficio
subject: enfoque dyual de descuento
subject: sostenibilidad
subject: descuento ambiental
subject: valoracion contingente
subject: Restauracion de Cuencas
subject: Economic Appraisal
subject: cost-benefit analysis
subject: dual rates discounting approach
subject: environmental discounting
subject: Watershed Restoration.

description: El descuento juega un papel central y controvertido en la evaluacion de politicas en el largo y muy largo plazo: central por el peso tiene en los reultados de la evaluacion economica en escenarios intergeneracionales, y controvertido por la dificultad de reconciliar primacia del presente sobre el future, en cuanto a medio ambiente se refiere, Ello esta generando un debate cada vez mas creciente en la literature cientifica. Este trabajo cuento diferentes para tangibles e intangibles, usadas simulaneamente en el mismo Analisis Coste Beneficio. Esta metodologia es aplicada, para su contraste empirico a la evaluacion en el que se han valorado los beneficios derivados del mismo mediante una aplicacion conjunta del metodo de valoracion contigente...Discounting plays a central and controversial role in the assessment of long and very long term policies: central because of its weight on the results of economic valuation over intergenerational scenarios and controversial due to the difficulty of reconciling "sustainability" and "valuing present over future" in as far as the environment is concerned. Thus, unsurprisingly, the issue of discounting has long generated a large body of literature of hot debates. This work proposes a dual-rate discounting approach that uses simultaneously two different discount rates for tangible and intangible assets. This method was empirically tested by applying it to the economic Valuation of a Watershed Restoration Project. The benefits generated by the project were assessed through the joint application of the Contingent Valuation Method.
Unravelling the Puzzle of the Eclipsing Polar SDSSJ 015543.40+002807.2 with XMM and Optical Photometry/Spectropolarimetry
Creators: name: Schmidt, Gary D.
name: Szkody, Paula
name: Homer, Lee
name: Smith, Paul S.
name: Chen, Bing
name: Henden, Arne
name: Solheim, Jan-Erik
name: Wolfe, Michael A.
name: Greimel, Robert
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The cataclysmic variable SDSSJ 015543.40+002807.2 is confirmed to be a magnetic system of the AM Herculis type. With an orbital period of 87.13 min, it is also the shortest-period eclipsing Polar known. Monitoring with XMM-Newton finds a high-state light curve dominated by a single X-ray emitting accretion pole located slightly prograde of the secondary star. The hard X-ray spectrum is typical of radial shocks on magnetic white dwarfs (kT ~ 10keV), and there is evidence for a soft X-ray component consistent with reprocessing from the stellar surface. The optical circular polarization is weak (v < 3%) when the accretion rate is high (mV ~ 15.5), due to optically-thick cyclotron emission and the apparent competition between two accreting poles. However, in low states (mV ~ 18), the polarization increases smoothly to the blue, reaching 20% at 4200A, and the flux spectrum displays a rich set of thermally-broadened cyclotron harmonics that indicate a polar field of 29MG. The phase interval preceding the 6.5 min eclipse depicts the development of P-Cygni components followed by complete absorption reversals in the emission lines. This phenomenon is not unexpected for a strongly accreting magnetic system viewed through the cool base of the funnel, and high-quality spectroscopy through this interval will likely lead to new insights into the dynamics of magnetic coupling and gas flow onto the white dwarf.
description: 20 pages, 12 figures
Identifying Dark Matter Haloes by the Caustic Boundary
Creators: name: Shandarin, Segei F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Dark matter density is formally infinite at the location of caustic surfaces, where dark matter sheet folds in phase space. The caustics separate multi-stream regions with different number of streams. Volume elements change the parity by turning inside out when passing through the caustic stage. Being measure-zero structures, identification of caustics via matter density fields is usually restricted to fine-grained simulations. Instead a generic purely geometric algorithm can be employed to identify caustics directly by using triangulation of Lagrangian sub-manifold x(q, t) where x and q are Eulerian and Lagrangian coordinates obtained in N-body simulations. The caustic surfaces are approximated by a set of triangles with vertices being the particles in the simulation. It is demonstrated that finding a dark matter halo is quite feasible by building its owtermost convex caustic. Neither more specific assumptions about the geometry of the boundary nor ad hoc parameters are needed. The halo boundary in our idealized but undoubtably generic simulation is neither spherical nor ellipsoidal but rather remarkably asymmetrical. The analysis of the kinetic and potential energies of individual particles and the halo as a whole along with an examination of the two-dimensional phase space has shown that the halo is gravitationally bound.
description: 28 pages, 13 figures. arXiv admin note: text overlap with arXiv:1906.05920
Medicion de impactos economicos a partir de una matriz de contabilidad social: el sector pesquero en Galicia
Creators: name: Fernandez Macho, Javier
name: Gallastegui Zulaica, Carmen
name: Gonzalez Casimiro, Pilar
name: Fernandez Macho, Javier
name: Gallastegui Zulaica, Carmen
name: Gonzalez Casimiro, Pilar
Publisher: name: Unknown
Year: 2006
Subjects: subject: Environmental Economics and Policy
subject: Production Economics
subject: Impacto exonomico
subject: gestion de pesquerias
subject: analisis input-output
subject: analisis regional
subject: gestion de recursos
subject: matriz de contabilidad social
subject: multiplicadores de impacto
subject: economic impact
subject: fisheries management
subject: input-output analysis
subject: regional analysis
subject: resource management
subject: social accounting matrix
subject: impact multipliers.

description: En este articulo se presenta una Matriz de Contabilidad Social (SAM) para el sector pesquero gallego. La informacion contenida en la SAM muestra la importancia del sector pesquero dentro de la economica gallega, permitiendo detectar que sectores contribuyen en mayor medida a la expansion economica regional, asi como su gran dpendencia respecto del exterior, en particular en relacion a la demanda proveniente del resto de Espana. Estos hechos sustentan el analisis subsiguiente en el que se han estimado, mediante los miltiplicadores contables calculados a partir de la SAM, los impactos economicos que un incremento de la demanda exterior de productos pesqueros genera en el conjunto de la economia gallega. la descomposicion de estos multiplicadores refleja ademas el peso de los distintos circuitos de interdependencia en la generacion de impactos economicos. Los resultados muestran que un incremento de las exportaciones hacia el resto del estado generarian importantes impactos sobre la produccion, la renta y el empleo en Galicia, no solo dentro del setor pesquero sino tambien en el resto de su economia...This article presents a Social Accounting Matric (SAM) for the Galician fishing sector, The data included in the SAM show the importance of the fishing sector within the Galician economy, allowing us to detect the sectors that contribute in greater measure to the regional economic expansion as well as its great external dependence, especially upon the demand from the rest of Spain. These facts uphold the subsequent analysis where the economic impacts of an increment in the external demand of fishing products on the rest of the Galician economy have been estimated through accounting multipliers calculated from the SAM. In addition, the breakdown of these multipliers shows the importance of the different interdependent circuits in generating these economic impacts. The results demonstrated that an increment in the exports to the rest of Spain would not generate important impacts on production, income and employment in Galicia, not only within the fishing sector but also in the rest of its economy.
Accurate radius and mass of the transiting exoplanet OGLE-TR-132b
Creators: name: Moutou, C.
name: Pont, F.
name: Bouchy, F.
name: Mayor, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The exoplanet OGLE-TR-132b belongs to the new class of very hot giant planets, together with OGLE-TR-56b and OGLE-TR-113b, detected by their transits. Recently, radial velocity measurements provided a planetary mass estimate for OGLE-TR-132b. The planet parameters, however, were poorly cons trained, because of the very shallow transit in the OGLE light curve. In this letter, based on new VLT/FORS2 photometric follow-up of OGLE-TR-132 of unprecedented quality (1.2 millimagnitude relative photometry), we confirm the planetary nature of the orbiting object, and we derive an accurate measurement of its radius and mass: 1.13 +- 0.08 R_J and 1.19 +- 0.13 M_J. The refined ephemeris of OGLE-TR-132 transits is T_0 = 2453142.5888 and P = 1.689857 days.
description: accepted in A&A letters
Physiology, behaviour and mortality of adult Fraser River sockeye salmon as they migrate upstream to spawn
Creators: name: Young, Jeffery
Publisher: name: University of British Columbia
Year: 2010

description: Sockeye salmon (Oncorhynchus nerka) undertake arduous upstream spawning migrations to complete their anadromous lifecycle. The success of this migration requires intensive energy use, complex physiological changes, and reproductive development. For the first time, I examine the relationships between individual physiology, migration timing, and mortality for a meta-population of sockeye salmon (late-run adults of the Adams- Shuswap stock complex) as they passed a single point in their upstream migration (i.e., in the Thompson River situated 270 krn from the coast). Since 1995, large segments of the late-run sockeye salmon stock complex from the Fraser River, British Columbia, Canada, have been initiating spawning migrations several weeks earlier than normal. Most early migrants die before spawning. To evaluate the mechanisms underlying the mortality, I non-lethally assessed physiological and energetic status, and tracked individuals using gastrically-inserted radio transmitters. Early migrants had higher gross somatic energy and lower reproductive hormone titres. However, aberrantly early migrants that failed to reach the spawning grounds had lower gross somatic energy and higher plasma reproductive hormone titres than aberrant migrants that successfully reached spawning grounds. Aberrant migrants that did not reach spawning grounds also had higher average migration ground speeds and higher plasma osmolality. Plasma lactate was higher in early migrants, which experienced higher water temperatures. Other physiological measures of stress were not related to migration timing, mortality, or environmental conditions. Plasma glucose was lower in early migrants, possibly influenced by reproductive development rather than stress. Fish surgically fitted with electromyogram radio transmitters did not continue their migration and fell downstream. These fish displayed excessive bleeding during transmitter implantation, an unusual phenomenon that likely contributed to the fish’s inability to resume migration. Blood clotting time decreased steadily throughout the migration period. Collectively, these data support the strong inverse relationship between somatic energy and reproductive development during upstream migration and implicate a combination of energy depletion, premature reproductive development, and blood loss from wounds as potential contributors to mortality in aberrantly early migrating sockeye salmon of the Fraser River late-run stock complex.
Accurate spectra for high energy ions by advanced time-of-flight diamond-detector schemes in experiments with high energy and intensity lasers
Creators: name: Salvadori, M.
name: Consoli, F.
name: Verona, C.
name: Cipriani, M.
name: Anania, M. P.
name: Andreoli, P. L.
name: Antici, P.
name: Bisesto, F.
name: Costa, G.
name: Cristofari, G.
name: De Angelis, R.
name: Di Giorgio, G.
name: Ferrario, M.
name: Galletti, M.
name: Giulietti, D.
name: Migliorati, M.
name: Pompili, R.
name: Zigler, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Time-Of-Flight (TOF) methods are very effective to detect particles accelerated in laser-plasma interactions, but they shows significant limitations when used in experiments with high energy and intensity lasers, where both high-energy ions and remarkable levels of ElectroMagnetic Pulses (EMPs) in the radiofrequency-microwave range are generated. Here we describe a novel advanced diagnostic method for the characterization of protons accelerated by intense matter interactions with high-energy and high-intensity ultra-short laser pulses up to the femtosecond and even future attosecond range. The method employs a stacked diamond detector structure and the TOF technique, featuring high sensitivity, high resolution, high radiation hardness and high signal-to-noise ratio in environments heavily affected by remarkable EMP fields. A detailed study on the use, the optimization and the properties of a single module of the stack is here also described for an experiment where a fast diamond detector is employed in an highly EMP-polluted environment. Accurate calibrated spectra of accelerated protons are presented from an experiment with the femtosecond Flame laser (beyond 100 TW power and ~$10^{19}$ W/cm$^2$ intensity) interacting with thin foil targets. The results that can be readily applied to the case of complex stack configurations and to more general experimental conditions.
description: 19 pages, 8 figures
Quasi-ballistic electron transport in double-wall carbon nanotubes
Creators: name: Kajiura, Hisashi
name: Huang, Houjin
name: Bezryadin, Alexey
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Room-temperature quasi-ballistic electron transport in double-wall carbon nanotubes (DWNT) is demonstrated. Conductance dependence on the length was measured by submerging DWNTs into liquid mercury. The conductance plots show plateaus, indicating weak dependence of the electrode-tube-electrode electrical resistance on the length of the connecting nanotube. We infer a mean free path between 0.6 and 10 micron meters for around 80% of the DWNTs, which is in good agreement with calculations based on the electron scattering by acoustic phonons and by disorder.
Exploring vestibulo-ocular adaptation in a closed-loop neuro-robotic experiment using STDP. A simulation study
Creators: name: Naveros, Francisco
name: Garrido, Jesus A.
name: Arleo, Angelo
name: Ros, Eduardo
name: Luque, Niceto R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Robotics (cs.RO)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Studying and understanding the computational primitives of our neural system requires for a diverse and complementary set of techniques. In this work, we use the Neuro-robotic Platform (NRP)to evaluate the vestibulo ocular cerebellar adaptatIon (Vestibulo-ocular reflex, VOR)mediated by two STDP mechanisms located at the cerebellar molecular layer and the vestibular nuclei respectively. This simulation study adopts an experimental setup (rotatory VOR)widely used by neuroscientists to better understand the contribution of certain specific cerebellar properties (i.e. distributed STDP, neural properties, coding cerebellar topology, etc.)to r-VOR adaptation. The work proposes and describes an embodiment solution for which we endow a simulated humanoid robot (iCub)with a spiking cerebellar model by means of the NRP, and we face the humanoid to an r-VOR task. The results validate the adaptive capabilities of the spiking cerebellar model (with STDP)in a perception-action closed-loop (r- VOR)causing the simulated iCub robot to mimic a human behavior.
title: Otto calculus or the weak Riemannian strucutre of (P2(M),W2)
Creators: name: Kniefacz, Philipp
Publisher: name: TU Wien
Year: 2017
Subjects: subject: Otto Calculus
subject: Riemannian Geometry
subject: Wasserstein Space
subject: Measure

description: We analyze the first order and second order differential structure of the space of probability measures with finite second moment on a Riemannian manifold endowed with the quadratic Wasserstein distance. After providing basics of Riemannian geometry, absolutely continuous curves and optimal transportation theory, we construct the so called weak Riemannian structure. Through the continuity equation we are able to define a suitable tangent space and to show the famous Benamou-Brenier formula. We then are able to associate to each absolutely continuous curve of measures a unique velocity vector field, lying in this tangent bundle. Afterwards we provide an alternative way of construction of a parallel transport in Euclidean space, by considering a submanifold of R n and showing certain Lipschitz bounds for the angle between the tangent spaces of two points on this submanifold. By mimicking the results of the Euclidean case, we show the existence and uniqueness of a parallel transport in the Wasserstein setting. In the course of this construction, we define transportation maps, that allow us to map tangent vectors from one tangent space to another. They will also provide us with the analogous Lipschitz bounds as in the Euclidean case. Finally, we use the parallel transport to define the Wasserstein analogon of the Levi-Civita connection.