cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Signatures of Quantum Transport Through Two-Dimensional Structures With Correlated and Anti-Correlated Interfaces
Creators: name: Low, Tony
name: Ansari, Davood
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electronic transport through a 2D deca-nanometer length channel with correlated and anti-correlated surfaces morphologies is studied using the Keldysh non-equilibrium Green function technique. Due to the pseudo-periodicity of these structures, the energy-resolved transmission possesses pseudo-bands and pseudo-gaps. Channels with correlated surfaces exhibit wider pseudo-bands than their anti-correlated counterparts. By surveying channels with various combinations of material parameters, we found that a smaller transport mass increases the channel transmittivity and energy bandwidth of the pseudo-bands. A larger quantization mass yields a larger transmittivity in channels with anti-correlated surfaces. For channels with correlated surfaces, the dependence of transmittivity on quantization mass is complicated by odd-to-even mode transitions. An enhanced threshold energy in the energy-resolved transmission can also be observed in the presence of surface roughness. The computed enhanced threshold energy was able to achieve agreement with the experimental data for Si[110] and Si[100] devices.
description: 9 pages, 10 figures, To be Published in Physical Review B
Comparing the efficacy of multimedia modules with traditional textbooks for learning introductory physics content
Creators: name: Stelzer, Timothy
name: Gladding, Gary
name: Mestre, Jose
name: Brookes, David T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: A clinical study was performed comparing the efficacy of multimedia learning modules with traditional textbooks for the first few topics of a calculus based introductory electricity and magnetism course. Students were randomly assigned to three different groups experiencing different presentations of the material; one group received the multimedia learning module presentations and the other two received the presentations via written text. All students were then tested on their learning immediately following the presentations as well as two weeks later. The students receiving the multimedia learning modules performed significantly better than the students experiencing the text-based presentations on both tests.
description: 21 pages, submitted to AJP
EMG-based Control Strategies of a Supernumerary Robotic Hand for the Rehabilitation of Sub-Acute Stroke Patients: Proof of Concept
Creators: name: Gnocco, Marina
name: Catalano, Manuel G.
name: Grioli, Giorgio
name: Trompetto, Carlo
name: Bicchi, Antonio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: One of the most frequent and severe aftermaths of a stroke is the loss of upper limb functionality. Therapy started in the sub-acute phase proved more effective, mainly when the patient participates actively. Recently, a novel set of rehabilitation and support robotic devices, known as supernumerary robotic limbs, have been introduced. This work investigates how a surface electromyography (sEMG) based control strategy would improve their usability in rehabilitation, limited so far by input interfaces requiring to subjects some level of residual mobility. After briefly introducing the phenomena hindering post-stroke sEMG and its use to control robotic hands, we describe a framework to acquire and interpret muscle signals of the forearm extensors. We applied it to drive a supernumerary robotic limb, the SoftHand-X, to provide Task-Specific Training (TST) in patients with sub-acute stroke. We propose and describe two algorithms to control the opening and closing of the robotic hand, with different levels of user agency and therapist control. We experimentally tested the feasibility of the proposed approach on four patients, followed by a therapist, to check their ability to operate the hand. The promising preliminary results indicate sEMG-based control as a viable solution to extend TST to sub-acute post-stroke patients.
description: 7 pages, 5 figures
Near-infrared spectroscopic indices for unresolved stellar populations. II. Index measurements
Creators: name: Gasparri, D.
name: Morelli, L.
name: Ivanov, V. D.
name: François, P.
name: Pizzella, A.
name: Coccato, L.
name: Corsini, E. M.
name: Bontà, E. Dalla
name: Costantin, L.
name: Cesetti, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We measured the equivalent width of a large set of near-infrared (NIR, 0.8--2.4$ \ μ$m) line-strength indices in the XShooter medium-resolution spectra of the central regions of 14 galaxies. We found that two aluminum indices Al at 1.31 $μ$m and Al1 at 1.67 $μ$m and the two CO indices CO1 at 1.56 $μ$m and CO4 at 1.64 $μ$m are tightly correlated with the velocity dispersion. Moreover, the NIR Al and CO1 indices show strong correlations with the optical Mg2 and Mgb indices, which are usually adopted as $α$/Fe-enhancement diagnostics. The molecular FeH1 index at 1.58 $μ$m tightly correlates with the optical and [MgFe]' indices, which are used as total metallicity diagnostics. The NIR Pa$β$ index at 1.28 $μ$m has a behaviour similar to the optical H$β$ index, which is a diagnostic of mean age. We defined two new composite indices, and [AlFeH], as possible candidates to be used as NIR diagnostics of total metallicity and $α$/Fe enhancement. The NIR index has a strong correlation with the optical Mg2 and Mgb indices, while the [AlFeH] index is tightly correlated with the optical and [MgFe]' indices. The distribution of the data points in the NIR Pa$β$- and Pa$β$-[AlFeH] diagrams mimic that in the optical [MgFe]'-H$β$ and the Mgb- diagrams, which are widely used to constraint the properties of the unresolved stellar populations. We concluded that some NIR line-strength indices could be useful in studying stellar populations as well as in fine-tuning stellar population models.
description: 15 pages, 9 figures. Accepted for publication in MNRAS
All reversible dynamics in maximally non-local theories are trivial
Creators: name: Gross, David
name: Mueller, Markus
name: Colbeck, Roger
name: Dahlsten, Oscar C. O.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A remarkable feature of quantum theory is non-locality (i.e. the presence of correlations which violate Bell inequalities). However, quantum correlations are not maximally non-local, and it is natural to ask whether there are compelling reasons for rejecting theories in which stronger violations are possible. To shed light on this question, we consider post-quantum theories in which maximally non-local states (non-local boxes) occur. It has previously been conjectured that the set of dynamical transformations possible in such theories is severely limited. We settle the question affirmatively in the case of reversible dynamics, by completely characterizing all such transformations allowed in this setting. We find that the dynamical group is trivial, in the sense that it is generated solely by local operations and permutations of systems. In particular, no correlations can ever be created; non-local boxes cannot be prepared from product states (in other words, no analogues of entangling unitary operations exist), and classical computers can efficiently simulate all such processes.
description: 4+3 pages, 1 figure, minor notational changes to match published version
CIFRA National Survey: Uruguay February 2014
Creators: name: CIFRA, In Bogliaccini, Juan, And Queirolo Rosario Laboratorio De Opinión Pública And Redes Sociales En Uruguay Collection (Social Networks And Public Opinion Lab Collection)
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Main problems of country; approval of police forms; approval of judicial courts; recent crime experiences; increasing public security; likability of political leaders; approval of President Jose Mujica; improving public education; approval of maintenance of relations with Argentina; improving foreign relations; approval of government economic policy; ideal priorities of government; attitudes towards political parties; voting in political parties; political spectrum position; past voting history; corruption; potential future voting plans; construction of liquefied gas regasification plant; economic situation of the country; changes in personal expenses. National Agency for Research and Innovation (ANII) Collection.
title: Mehr Weiterbildung  für alle
title: Fachkräftesicherung durch Bildungszeit
titleType: Subtitle
Creators: name: Ehlert, Martin
name: Grüttgen, Insa
name: Kunze, Luisa
name: Ortmann, Tobias
name: Oehmig, Leonie
Publisher: name: Bertelsmann Stiftung
publisherIdentifier: https://ror.org/01wj9hk44
publisherIdentifierScheme: ROR
Year: 2024
Subjects: Weiterbildung
Fortbildung
Fachkräfte
Fachkräftemangel
Bildungszeit
Bildungskarenz

description: Der demografische Wandel und die Entwicklung hin zu einer digitalisierten, grünen Wirtschaft führen zu einer Gleichzeitigkeit von Fachkräftemangel und Stellenabbau. Dieses Fachkräfte-Paradox kann durch mehr Qualifizierung auch in der Mitte des Erwerbslebens teilweise aufgelöst werden. Denn knapp 30 Prozent aller Beschäftigten würden sich auch gern beruflich weiterbilden, aber nur 6,5 Prozent haben dafür einen Plan. Besonders groß ist die Kluft bei Helfer:innen. Die Gründe: Ihr Arbeitgeber stellt sie nicht frei, zudem fehlt ihnen der Überblick über konkrete Angebote. Höherqualifizierte Beschäftigte haben besseren Zugang zu Weiterbildungsmöglichkeiten - aber zu wenig Zeit. Das Konzept einer bis zu einjährigen, finanzierten Bildungszeit könnte für mehr Chancengerechtigkeit sorgen. Zentrale Handlungsempfehlungen der Studie benennen Wege und wirksame Hebel zur Ausgestaltung von Bildungszeit, um individuelle Beschäftigung zu verbessern, den Fachkräftemangel zu beheben und den Strukturwandel zu bewältigen.
VIBES: Vibro-Inertial Bionic Enhancement System in a Prosthetic Socket
Creators: name: Ivani, Alessia Silvia
name: Barontini, Federica
name: Catalano, Manuel G.
name: Grioli, Giorgio
name: Bianchi, Matteo
name: Bicchi, Antonio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The use of vibrotactile feedback is of growing interest in the field of prosthetics, but few devices fully integrate this technology in the prosthesis to transmit high-frequency contact information (such as surface roughness and first contact) arising from the interaction of the prosthetic device with external items. This study describes a wearable vibrotactile system for high-frequency tactile information embedded in the prosthetic socket. The device consists of two compact planar vibrotactile actuators in direct contact with the user's skin to transmit tactile cues. These stimuli are directly related to the acceleration profiles recorded with two IMUS placed on the distal phalanx of a soft under-actuated robotic prosthesis (SoftHand Pro). We characterized the system from a psychophysical point of view with fifteen able-bodied participants by computing participants' Just Noticeable Difference (JND) related to the discrimination of vibrotactile cues delivered on the index finger, which are associated with the exploration of different sandpapers. Moreover, we performed a pilot experiment with one SoftHand Pro prosthesis user by designing a task, i.e. Active Texture Identification, to investigate if our feedback could enhance users' roughness discrimination. Results indicate that the device can effectively convey contact and texture cues, which users can readily detect and distinguish.
description: 6 pages, 8 figures, 2023 International Conference on Rehabilitation Robotics (ICORR)
Point processes in arbitrary dimension from fermionic gases, random matrix theory, and number theory
Creators: name: Torquato, Salvatore
name: Scardicchio, A.
name: Zachary, Chase E
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: It is well known that one can map certain properties of random matrices, fermionic gases, and zeros of the Riemann zeta function to a unique point process on the real line. Here we analytically provide exact generalizations of such a point process in d-dimensional Euclidean space for any d, which are special cases of determinantal processes. In particular, we obtain the n-particle correlation functions for any n, which completely specify the point processes. We also demonstrate that spin-polarized fermionic systems have these same n-particle correlation functions in each dimension. The point processes for any d are shown to be hyperuniform. The latter result implies that the pair correlation function tends to unity for large pair distances with a decay rate that is controlled by the power law r^[-(d+1)]. We graphically display one- and two-dimensional realizations of the point processes in order to vividly reveal their "repulsive" nature. Indeed, we show that the point processes can be characterized by an effective "hard-core" diameter that grows like the square root of d. The nearest-neighbor distribution functions for these point processes are also evaluated and rigorously bounded. Among other results, this analysis reveals that the probability of finding a large spherical cavity of radius r in dimension d behaves like a Poisson point process but in dimension d+1 for large r and finite d. We also show that as d increases, the point process behaves effectively like a sphere packing with a coverage fraction of space that is no denser than 1/2^d.
description: 40 pages, 11 figures, 1 table, iopart; corrected mislabeled section numbers and minor typographical issues; minor text changes
Steady-state simulations using weighted ensemble path sampling
Creators: name: Bhatt, Divesh
name: Zhang, Bin W.
name: Zuckerman, Daniel M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We extend the weighted ensemble (WE) path sampling method to perform rigorous statistical sampling for systems at steady state. The straightforward steady-state implementation of WE is directly practical for simple landscapes, but not when significant metastable intermediates states are present. We therefore develop an enhanced WE scheme, building on existing ideas, which accelerates attainment of steady state in complex systems. We apply both WE approaches to several model systems confirming their correctness and efficiency by comparison with brute-force results. The enhanced version is significantly faster than the brute force and straightforward WE for systems with WE bins that accurately reflect the reaction coordinate(s). The new WE methods can also be applied to equilibrium sampling, since equilibrium is a steady state.
Effective complexity of stationary process realizations
Creators: name: Ay, Nihat
name: Mueller, Markus
name: Szkola, Arleta
Publisher: name: arXiv
Year: 2010
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The concept of effective complexity of an object as the minimal description length of its regularities has been initiated by Gell-Mann and Lloyd. The regularities are modeled by means of ensembles, that is probability distributions on finite binary strings. In our previous paper we propose a definition of effective complexity in precise terms of algorithmic information theory. Here we investigate the effective complexity of binary strings generated by stationary, in general not computable, processes. We show that under not too strong conditions long typical process realizations are effectively simple. Our results become most transparent in the context of coarse effective complexity which is a modification of the original notion of effective complexity that uses less parameters in its definition. A similar modification of the related concept of sophistication has been suggested by Antunes and Fortnow.
description: 14 pages, no figures
Bulk viscosity of strongly coupled plasmas with holographic duals
Creators: name: Gubser, Steven S.
name: Pufu, Silviu S.
name: Rocha, Fabio D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explain a method for computing the bulk viscosity of strongly coupled thermal plasmas dual to supergravity backgrounds supported by one scalar field. Whereas earlier investigations required the computation of the leading dissipative term in the dispersion relation for sound waves, our method requires only the leading frequency dependence of an appropriate Green's function in the low-frequency limit. With a scalar potential chosen to mimic the equation of state of QCD, we observe a slight violation of the lower bound on the ratio of the bulk and shear viscosities conjectured in arXiv:0708.3459.
description: 33 pages, 3 figures
Multiple genus 2 Heegaard splittings: a missed case
Creators: name: Berge, John
name: Scharlemann, Martin
Publisher: name: arXiv
Year: 2009
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M50

description: A gap in a paper of Rubinstein-Scharlemann is explored: new examples are found of closed orientable 3-manifolds with possibly multiple genus 2 Heegaard splittings. Properties common to all the examples in the original paper are not universally shared by the new examples: some of the new examples have Hempel distance 3, and it is not clear that a single stabilization always makes the multiple splittings isotopic.
description: Reference to arxiv:1002.4887 added
Fach- und fallspezifische KI-Bildung in den Geisteswissenschaften
Creators: name: Beyer, Andrea
name: Schulz, Konstantin
Publisher: name: Zenodo
Year: 2024
Subjects: subject: Artificial intelligence
subject: Natural language processing
subject: Languages and literature
subject: FOS: Languages and literature
subject: Classics
subject: Educational sciences
subject: FOS: Educational sciences

description: Die Präsentation „Fach- und fallspezifische KI-Bildung in den Geisteswissenschaften“ beleuchtet die Bedeutung einer gezielten KI-Ausbildung für die Geisteswissenschaften. Im Zentrum steht die Notwendigkeit, KI-Kompetenzen zu entwickeln, um den Herausforderungen der digitalen Transformation in Forschung und Lehre gerecht zu werden. Die Einführung stellt dar, warum KI-Bildung für eine informierte Auseinandersetzung mit gesellschaftlichen und wissenschaftlichen Fragen unerlässlich ist, etwa bei der Erkennung von Bias, der Nutzung von KI-Tools im Alltag oder der Analyse von Deepfakes.

Es wird ein mehrstufiges Konzept der KI-Bildung vorgestellt, das sich an Lernende ohne informatische Vorkenntnisse richtet und Fach- sowie Fallbeispiele aus den Geisteswissenschaften nutzt, um den praktischen Nutzen von KI-Anwendungen zu verdeutlichen. Der Schwerpunkt liegt auf der Vermittlung von AI Literacy, Data Literacy und Digital Literacy auf verschiedenen Kompetenzstufen – von Anfänger bis Experte. Dabei wird verdeutlicht, wie diese Kompetenzen gezielt für die Analyse historischer und literarischer Fragestellungen eingesetzt werden können. Abschließend wird die Rolle der KI-Bildung sowohl für Lehrende als auch für Forschende und Studierende in den Geisteswissenschaften betont.
Dynamical nuclear spin polarization induced by electronic current through double quantum dots
Creators: name: López-Monís, Carlos
name: Iñarrea, Jesús
name: Platero, Gloria
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyze electron spin relaxation in electronic transport through coherently coupled double quantum dots in the spin blockade regime. In particular, we focus on hyperfine interaction as the spin relaxation mechanism. We pay special attention to the effect of the dynamical nuclear spin polarization induced by the electronic current on the nuclear environment. We discuss the behaviour of the electronic current and the induced nuclear spin polarization versus an external magnetic field for different hyperfine coupling intensities and interdot tunnelling strengths. We take into account, for each magnetic field, all hyperfine mediated spin relaxation processes coming from the different opposite spin levels approaches. We find that the current as a function of the external magnetic field shows a peak or a dip, and that the transition from a current dip to a current peak behaviour is obtained by decreasing the hyperfine coupling or by increasing the interdot tunnelling strength. We give a physical picture in terms of the interplay between the electrons tunnelling out of the double quantum dot and the spin flip processes due to the nuclear environment.
description: 25 pages and 8 figures. To be published in New Journal of Physics
Technical information on the installation and configuration of the software for the National Repository of Angola
Creators: name: United Nations Educational, Scientific and Cultural Organization
name: Ministério Do Ensino Superior, Ciência
name: Redalyc-Universidad Autónoma Del Estado De México
name: AmeliCA
name: Universidade Óscar Ribas
Publisher: name: Zenodo
Year: 2022
Subjects: Open Access
Angola
Africa
configuration
software
system

description: Work derived from the collaborative project among Redalyc UAEM, AmeliCA, MESCTI and U. Óscar Ribas funded by UNESCO for the development of an Open Access strategy in Angola. Vol. 30 of 38
description: {"references": ["DSpace 6.x Documentation (2018). https://wiki.lyrasis.org/display/DSDOC6x/DSpace+6.x+Documentation"]}
Competition between Kondo and RKKY exchange couplings in Pu{1-x}Am{x} alloys
Creators: name: Han, M. J.
name: Wan, X.
name: Savrasov, S. Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: To clarify the role of the Kondo effect in screening local magnetic moments of Plutonium 5f--electrons as well as its competition to the RKKY interactions we use a combination of density functional theory with static Hartree Fock and dynamic Hubbard 1 approximations to calculate the strength of both the Kondo exchange, J_K, and of the RKKY exchange, J_RKKY, couplings for Pu{1-x}Am{x} system as a function of x. We find that J_K increases despite the atomic volume gets larger with the Am doping due to unexpected enhancement of hybridization between f and conduction electrons in the vicinity of the Fermi level. At the same time, the RKKY exchange is shown to reduce smoothly with increasing x. Our results imply that the Kondo effect should be robust against the increase in interatomic spacing of this alloy.
description: 5 pages, 1 figure
On extrema of stable processes
Creators: name: Kuznetsov, Alexey
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We study the Wiener--Hopf factorization and the distribution of extrema for general stable processes. By connecting the Wiener--Hopf factors with a certain elliptic-like function we are able to obtain many explicit and general results, such as infinite series representations and asymptotic expansions for the density of supremum, explicit expressions for the Wiener--Hopf factors and the Mellin transform of the supremum, quasi-periodicity and functional identities for these functions, finite product representations in some special cases and identities in distribution satisfied by the supremum functional.
description: Published in at http://dx.doi.org/10.1214/10-AOP577 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
TeV Scale Seesaw and a flavorful Z' at the LHC
Creators: name: Chen, Mu-Chun
name: Huang, Jinrui
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Small neutrino masses and their large mixing angles can be generated at the TeV scale by augmenting the Standard Model with an additional generation dependent, anomaly-free U(1)_{nu} symmetry, in the presence of three right-handed neutrinos. The Z' gauge boson associated with the breaking of the U(1)_{nu} symmetry can be produced at the LHC. The flavorful nature of the Z' can be established by measuring its non-universal couplings to the charged leptons as determined by the lepton's U(1)_{nu} charges, which also govern the neutrino flavor structure. While the LHC has the potential of discovering the Z' up to M_{Z'} = 4.5 TeV with 100 fb^(-1) data at the center of mass energy sqrt{s} = 14 TeV, to establish the flavorful nature of the Z' requires much higher integrated luminosity. For our bench mark parameters that are consistent with neutrino oscillation data, at sqrt{s} = 14 TeV, a 5 sigma distinction between the dielectron and dimuon channels for M_{Z'} = 3 TeV requires 500 fb^(-1) of data. We find that the forward backward asymmetry distributions can also be useful in distinguishing the dielectron and dimuon channels in the low invariant mass and transverse momentum regions.
description: 9 pages, 13 figures; v2: version to appear in Phys. Rev. D
The behaviour of Vancouver Island marmots, Marmota vancouverensis
Creators: name: Heard, Douglas C.
Publisher: name: University of British Columbia
Year: 2010

description: I studied the social behaviour of the Vancouver Island marmot, Marmota vancouverensis, during the summers of 1973 and 1974. Virtually nothing was known about the behaviour of this species at the outset of this study, Barash (1973b, 1974a) suggested that the social behaviour and social organization of marmot species was determined by the severity of the environment (the vegetative growing season) and its effect on the growth rate of marmots. He predicted that marmot species living in short growing season environments would be highly social but that social tolerance would decrease as the growing season increased. The objective of this study was to test this hypothesis by observing the social behaviour of Vancouver Island marmots and comparing this to the length of the vegetative growing season. M. vancouverensis is endemic to Vancouver Island, British Columbia. The original colonizers of this species probably crossed to Vancouver Island via land connections that existed during the Illinoian glacial period, approximately 100,000 years ago, and survived subsequent glacial maxima on nunataks and coastal refugia or both. Vancouver Island marmots have been isolated from mainland forms for a length of time (10,000 to 100,000 years) sufficient to show specific evolutionary adaptations to their Vancouver Island environment. Vancouver Island marmots live in small colonies in the subalpine parkland. Social groups consisted of one adult male, one adult female, and variable numbers of two-year-olds, yearlings, and infants. Social groups were highly integrated with a large amount of communication occurring among colony members. Alarm calls were given in response to potential predators and could be heard over the whole colony. Short whistles were given in response to aerial predators (e.g. eagles) and long whistles were given in response to terrestrial predators (e.g. black bears). Both calls are narrow bandwidth sounds, a characteristic that makes them difficult to locate. The most common social behaviour that occurred among colony members was a nose touching behaviour termed greeting. All age-sex classes of Vancouver Island marmots engaged in greetings as well as other social behaviour patterns in about the same proportions. The vegetative growing season experienced by Vancouver Island marmots was approximately the same as that of M. flaviventris but the social behaviour of Vancouver Island marmots most closely resembled M. olympus, a species living where the growing season is much shorter. On this basis I rejected Barash's hypothesis that the length of the vegetative growing season is sufficient to account for the variability that Barash observed among marmot species. I suggest that vegetative growing season not be used as an index of growth rate but that the time taken to reach adult size be measured directly. The degree of social tolerance is positively correlated with the length of time required to reach maturity.
Mutational analysis of cell development in Paramecium tetraurelia
Creators: name: Jones, Donald
Publisher: name: University of British Columbia
Year: 2010

description: Temperature-sensitive mutants have been used in this study to examine development in Paramecium tetraurelia. Ten mutations affecting development were described. Since two of the mutants were allelic, the effects of nine genes on Paramecium development were studied. Of these, two affect formation of the fission-zone (called dfz or defective fission-zone mutants), five affect constriction of the fission-furrow (called dc or defective constriction mutants), and two produce a reduction in cell size (called sm or small mutants). Morphometric measurements were made on inter-fission and dividing wild-type and mutant cells to examine two aspects of Paramecium development: changes in cell shape and size which preceed and accompany cell division and positioning of new structures on the cell surface during cell division. This analysis suggested the following hypotheses: 1. The shape and size changes which preceed and accompany cell division in Paramecium are causally related to cell division. Defective constriction mutants undergo exaggerated contraction prior to fission-furrow formation. This contraction appears to interfere with the decrease in cell width which ordinarily occurs during division. Although the mutant cells are able to make a normal amount of furrow surface, the abnormal cell width prevents furrow completion. Premature contractions seen in dfz mutants similarly interfere with furrow formation. 2. Surface growth in Paramecium is dependent on prior basal body proliferation. Basal bodies appear to act as organizing centres for surface growth. Reduced basal body proliferation in mutant cells was always associated with reduced surface growth: There was a consistent relationship between the number of new basal bodies produced proceeding cell division and the amount of surface growth which occurred. The order of the causal relationship was suggested by the observation that basal body proliferation was completed prior to the beginning of surface growth. 3. The positioning of new structures during cell division in Paramecium can be affected by the pre-existing cell shape, size, or structure. This model, called mechanical guidance, was based on observations of the movement and positioning of the vestibule (the opening leading to the mouth) in wild-type and mutant cells. This model was discussed in relation to other developmental mechanisms proposed to account for protozoan morphogenesis.
Stenomacrus curvulus
Creators: name: Riedel
name: Pénigot
name: Schwarz
name: Diller
name: Johansson
name: Japoshvili, G.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Stenomacrus
Stenomacrus curvulus

description: Stenomacrus curvulus (THOMSON, 1897)
M a t e r i a l e x a m i n e d: Trap 15: 1♀ 11-25.viii., 2♀♀ 25.viii.-8.ix.
D i s t r i b u t i o n: Western Palaearctic, new record for Georgia and the Caucasus region.
description: Published as part of Riedel, Pénigot, Schwarz, Diller, Johansson & Japoshvili, G., 2023, Darwin wasps (Hymenoptera, Ichneumonidae) of the Kintrishi National Park, Sakartvelo (Georgia), with descriptions of six new species, pp. 61-153 in Linzer biologische Beiträge 55 (1) on page 119, DOI: 10.5281/zenodo.10415120
Shear viscosity from kaon condensation in color-flavor-locked quark matter
Creators: name: Alford, Mark G.
name: Braby, Matt
name: Mahmoodifar, Simin
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate the kaonic contribution to the shear viscosity of quark matter in the kaon-condensed color-flavor locked phase (CFL-K0). This contribution comes from a light pseudo-Goldstone boson which arises from the spontaneous breaking of the flavor symmetry by the kaon condensate. The other contribution, from the exactly massless superfluid 'phonon", has been calculated previously. We specialize to a particular form of the interaction lagrangian, parameterized by a single coupling. We find that if we make reasonable guesses for the values of the parameters of the effective theory, the kaons have a much smaller shear viscosity than the superfluid phonons, but also a much shorter mean free path, so they could easily provide the dominant contribution to the shear viscosity of CFL-K0 quark matter in a neutron star in the temperature range 0.01 to 1 MeV (10^8 to 10^10 K).
description: 31 pages, 4 figures minor changes from referees including title
Serendipitous VLBI detection of rapid, large-amplitude, intraday variability in QSO 1156+295
Creators: name: Savolainen, T.
name: Kovalev, Y. Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report a serendipitous detection of rapid, large amplitude flux density variations in the highly core-dominated, flat-spectrum radio quasar 1156+295 during an observing session at the Very Long Baseline Array (VLBA). The source was observed as a part of the MOJAVE survey programme with the VLBA at 15 GHz on February 5, 2007. Large amplitude variability in the correlated flux density, unexplainable in terms of the source structure, was first discovered while processing the data, and later confirmed by calibrating the antenna gains using 24 other sources observed in the experiment. The source shows variations in the correlated flux density as high as 40% on a timescale of only 2.7 hours. This places 1156+295 between the classical IDV sources and the so-called intra-hour variables. The observed variability timescale and the modulation index of 13% are consistent with interstellar scintillation by a nearby, highly turbulent scattering screen. The large modulation index at 15 GHz implies a scattering measure that is atypically high for a high galactic latitude source such as 1156+295.
description: Accepted for publication in Astronomy & Astrophysics
Longitudinal magnetic field increases critical current in superconducting strip
Creators: name: Brandt, Ernst Helmut
name: Mikitik, Grigorii
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The critical state of the vortex lattice in a thin strip is considered for the case when first a perpendicular magnetic field is applied, then a longitudinal field, and then again the perpendicular field is increased. This longitudinal field can strongly enhance the critical currents in the strip since the vortices are inclined and the currents flow in the strip plane.
description: 4 pages, 5 figures, for Low Temperature Conference LT25
Redshift Sensitivity of the Kaiser Effect
Creators: name: Simpson, Fergus
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We explore potential strategies for testing General Relativity via the coherent motions of galaxies. Our position at z=0 provides the reference point for distance measures in cosmology. By contrast, the Cosmic Microwave Background at z ~ 1100 acts as the point of reference for the growth of large scale structure. As a result, we find there is a lack of synergy between growth and distance measures. We show that when measuring the gravitational growth index gamma using redshift-space distortions, typically 80% of the signal corresponds to the local growth rate at the galaxy bin location, while the remaining fraction is determined by its behaviour at higher redshifts. In order to clarify whether modified gravity may be responsible for the dark energy phenomenon, the aim is to search for a modification to the growth of structure. One might expect the magnitude of this deviation to be commensurate with the apparent dark energy density Omega_Lambda(z). This provides an incentive to study redshift-space distortions (RSD) at as low a redshift as is practical. Specifically, we find the region around z = 0.5 offers the optimal balance of available volume and signal strength.
description: 5 pages, 4 figures, changes reflect published version
Neutrino masses in lepton number violating mSUGRA
Creators: name: Kom, C. H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In SUSY models which violate R-parity, there exist trilinear lepton number violating (LNV) operators which can lead to neutrino masses. If these operators are defined at the unification scale, the renormalization group flow becomes important and generally leads to one neutrino mass much heavier than the others. We study, in a minimal supergravity (mSUGRA) set-up with two trilinear LNV operators and three charged lepton mixing angles, numerically how these parameters may be arranged to be compatible with neutrino oscillation data, and discuss some phenomenological observations.
description: 3 pages, 2 figures. Talk given at SUSY08. To be published in the Conference Proceedings
Spectral Signatures of Photon-Particle Oscillations from Celestial Objects
Creators: name: Chelouche, Doron
name: Rabadan, Raul
name: Pavlov, Sergey
name: Castejon, Francisco
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give detailed predictions for the spectral signatures arising from photon-particle oscillations in astrophysical objects. The calculations include quantum electrodynamic effects as well as those due to active relativistic plasma. We show that, by studying the spectra of compact sources, it may be possible to directly detect (pseudo-)scalar particles, such as the axion, with much greater sensitivity, by roughly three orders of magnitude, than is currently achievable by other methods. In particular, if such particles exist with masses m_a<0.01[eV] and coupling constant to the electromagnetic field, g>1e-13[1/GeV], then their oscillation signatures are likely to be lurking in the spectra of magnetars, pulsars, and quasars.
description: 29 pages (reduced resolution for figs. 3, 4b, 7)
N-fold Supersymmetry and Quasi-solvability Associated with X_2-Laguerre Polynomials
Creators: name: Tanaka, Toshiaki
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We construct a new family of quasi-solvable and N-fold supersymmetric quantum systems where each Hamiltonian preserves an exceptional polynomial subspace of codimension 2. We show that the family includes as a particular case the recently reported rational radial oscillator potential whose eigenfunctions are expressed in terms of the X_2-Laguerre polynomials of the second kind. In addition, we find that the two kinds of the X_2-Laguerre polynomials are ingeniously connected with each other by the N-fold supercharge.
description: 22 pages, no figures; minor corrections, to appear in Journal of Mathematical Physics
FAVQULODDA VAZIYATLAR YO'NALISHI KURSANTLARIDA MULOQOT MADANIYATINI TARBIYALASH METODIKASI
Creators: name: Boltayev, Baxtiyor
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada favqulodda vaziyatlar yo‘nalishi kursantlarining muloqot madaniyatini shakllantirish va rivojlantirish metodikasiga doir fikrlar keltirilib tahlil qilingan. Shuningdek, kursantlarda samarali muloqot ko‘nikmalarini rivojlantirish orqali ularning kasbiy kompetensiyalarini yuksaltirishga qaratilgan metodik g‘oyalar ilgari surilgan.
Localization, $\mathcal{PT}$-Symmetry Breaking and Topological Transitions in non-Hermitian Quasicrystals
Creators: name: Acharya, Aruna Prasad
name: Chakrabarty, Aditi
name: Sahu, Deepak Kumar
name: Datta, Sanjoy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: According to the topological band theory of a Hermitian system, the different electronic phases are classified in terms of topological invariants, wherein the transition between the two phases characterized by a different topological invariant is the primary signature of a topological phase transition. Recently, it has been argued that the delocalization-localization transition in a quasicrystal, described by the non-Hermitian $\mathcal{PT}$-symmetric extension of the Aubry-André-Harper (AAH) Hamiltonian can also be identified as a topological phase transition. Interestingly, the $\mathcal{PT}$-symmetry also breaks down at the same critical point. However, in this article, we have shown that the delocalization-localization transition and the $\mathcal{PT}$-symmetry breaking are not connected to a topological phase transition. To demonstrate this, we have studied the non-Hermitian $\mathcal{PT}$-symmetric AAH Hamiltonian in the presence of Rashba Spin-Orbit (RSO) coupling. We have obtained an analytical expression of the topological transition point and compared it with the numerically obtained critical points. We have found that, except in some special cases, the critical point and the topological transition point are not the same. In fact, the delocalization-localization transition takes place earlier than the topological transition whenever they do not coincide.
description: 6 pages, 14 figures
Anais do II Encontro Técnico-Científico Integrado dos Grupos PET
Creators: name: Povh, Juliana Aparecida
Publisher: name: Zenodo
Year: 2024
Subjects: Science
search
interdisciplinary
UFU
PET

description: O II Encontro Técnico-Científico Integrado dos Grupos PET constitui uma continuação na promoção e disseminação do conhecimento científico entre os grupos PET da Universidade Federal de Uberlândia. A segunda edição, realizada em 21 e 22 de agosto de 2024, no Câmpus Pontal, em Ituiutaba, MG, coordenada pelos grupos PET Matemática, PET Saúde, Cultura e Saberes, e PET (Re)conectando, destacou-se por atender à necessidade de criação de espaços para o diálogo, troca de conhecimentos e capacitação dos petianos, além de fomentar a interação com a comunidade acadêmica. A programação contemplou palestras, oficinas, e a submissão e apresentação de trabalhos científicos, com menção honrosa para aqueles de maior destaque. O evento reafirma o compromisso com a qualidade das contribuições científicas e destaca-se pela relevância na formação dos participantes, contribuindo para a divulgação da diversidade e da qualidade das iniciativas acadêmicas dos grupos PET.
Steps towards a theory and calculus of aliasing
Creators: name: Meyer, Bertrand
Publisher: name: arXiv
Year: 2010
Subjects: subject: Software Engineering (cs.SE)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences
subject: D.1.5; D.2.4; F.3.1; F.3.2; F.3.3; F.3.1; F.4.1

description: A theory, graphical notation, mathematical calculus and implementation for finding whether two given expressions can, at execution time, denote references attached to the same object. Intended as the basis for a comprehensive solution to the "frame problem" and as a complement to, or even a replacement for, separation logic, shape analysis, ownership types and dynamic frames.
description: Revision of original JOT paper. To appear in IJSI (International Journal of Software and Informatics) in 2011. The original title was: The theory and calculus of aliasing
A stochastic model of anomalous heat transport: analytical solution of the steady state
Creators: name: Lepri, Stefano
name: Mejia-Monasterio, Carlos
name: Politi, Antonio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We consider a one-dimensional harmonic crystal with conservative noise, in contact with two stochastic Langevin heat baths at different temperatures. The noise term consists of collisions between neighbouring oscillators that exchange their momenta, with a rate $γ$. The stationary equations for the covariance matrix are exactly solved in the thermodynamic limit ($N\to\infty$). In particular, we derive an analytical expression for the temperature profile, which turns out to be independent of $γ$. Moreover, we obtain an exact expression for the leading term of the energy current, which scales as $1/\sqrt{γN}$. Our theoretical results are finally found to be consistent with the numerical solutions of the covariance matrix for finite $N$.
description: Minor changes in the text. To appear in Journal of Physics A
Jacob Hedges House, Stairway Details
Creators: name: Weber, Harvey A.
Publisher: name: Unknown
Year: 1970
Subjects: Photographs
Photos
Historic buildings
East Hampton
Structures
Dwellings
Hedges Family

description: This image shows a interior view of details of the stairway in the Jacob Hedges House located at 73 Pantiago Road. This image was taken by photographer Harvey A. Weber (1917-1991) and is part of the East Hampton’s Heritage Photo Collection.
description: Images within East Hampton Heritage Photo Collection seem to have been taken or collected in relation to the East Hampton Heritage project, but not all of them were included in the final publication. Several photographer are included in this collection.
HI clouds in the proximity of M33
Creators: name: Grossi, M.
name: Giovanardi, C.
name: Corbelli, E.
name: Giovanelli, R.
name: Haynes, M. P.
name: Martin, A. M.
name: Saintonge, A.
name: Dowell, J. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Neutral hydrogen clouds are found in the Milky Way and Andromeda halo both as large complexes and smaller isolated clouds. Here we present a search for Hi clouds in the halo of M33, the third spiral galaxy of the Local Group. We have used two complementary data sets: a 3^o x 3^o map of the area provided by the Arecibo Legacy Fast ALFA (ALFALFA) survey and deeper pointed observations carried out with the Arecibo telescope in two fields that permit sampling of the north eastern and south-western edges of the HI disc. The total amount of Hi around M33 detected by our survey is $\sim 10^7$ M$_{\odot}$. At least 50% of this mass is made of HI clouds that are related both in space and velocity to the galaxy. We discuss several scenarios for the origin of these clouds focusing on the two most interesting ones: $(a)$ dark-matter dominated gaseous satellites, $(b)$ debris from filaments flowing into M33 from the intergalactic medium or generated by a previous interaction with M31. Both scenarios seem to fit with the observed cloud properties. Some structures are found at anomalous velocities, particularly an extended HI complex previously detected by Thilker et al. (2002). Even though the ALFALFA observations seem to indicate that this cloud is possibly connected to M33 by a faint gas bridge, we cannot firmly establish its extragalactic nature or its relation to M33. Taking into account that the clouds associated with M33 are likely to be highly ionised by the extragalactic UV radiation, we predict that the total gas mass associated with them is > 5 x 10^7 M$_{\odot}$. If the gas is steadily falling towards the M33 disc it can provide the fuel needed to sustain a current star formation rate of 0.5 M$_{\odot}$ yr$^{-1}$.
description: 16 pages, 19 figures. Accepted for publication in A&A