cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Two-Fluid Magnetohydrodynamic Simulations of Relativistic Magnetic Reconnection
Creators: name: Zenitani, Seiji
name: Hesse, Michael
name: Klimas, Alex
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the large scale evolution of a relativistic magnetic reconnection in an electron-positron pair plasma by a relativistic two-fluid magnetohydrodynamic (MHD) code. We introduce an inter-species friction force as an effective resistivity to dissipate magnetic fields. We demonstrate that magnetic reconnection successfully occurs in our two-fluid system, and that it involves Petschek-type bifurcated current layers in later stage. We further observe a quasi-steady evolution thanks to an open boundary condition, and find that the Petschek-type structure is stable over the long time period. Simulation results and theoretical analyses exhibit that the Petschek outflow channel becomes narrower when the reconnection inflow contains more magnetic energy, as previously claimed. Meanwhile, we find that the reconnection rate goes up to ~1 in extreme cases, which is faster than previously thought. The role of the resistivity, implications for reconnection models in the magnetically dominated limit, and relevance to kinetic reconnection works are discussed.
description: Astrophysical Journal, 696, 1385; 40 pages, 14 figures
Sensitivity of the g-mode frequencies to pulsation codes and their parameters
Creators: name: Moya, A.
name: Mathur, S.
name: Garcia, R. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: From the recent work of the Evolution and Seismic Tools Activity (ESTA, Lebreton et al. 2006; Monteiro et al. 2008), whose Task 2 is devoted to compare pulsational frequencies computed using most of the pulsational codes available in the asteroseismic community, the dependence of the theoretical frequencies with non-physical choices is now quite well fixed. To ensure that the accuracy of the computed frequencies is of the same order of magnitude or better than the observational errors, some requirements in the equilibrium models and the numerical resolutions of the pulsational equations must be followed. In particular, we have verified the numerical accuracy obtained with the Saclay seismic model, which is used to study the solar g-mode region (60 to 140$μ$Hz). We have compared the results coming from the Aarhus adiabatic pulsation code (ADIPLS), with the frequencies computed with the Granada Code (GraCo) taking into account several possible choices. We have concluded that the present equilibrium models and the use of the Richardson extrapolation ensure an accuracy of the order of $0.01 μHz$ in the determination of the frequencies, which is quite enough for our purposes.
description: 10 pages, 5 figures, accepted in Solar Physics
Stability and dynamical properties of material flow systems on random networks
Creators: name: Anand, Kartik
name: Galla, Tobias
Publisher: name: arXiv
Year: 2009
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The theory of complex networks and of disordered systems is used to study the stability and dynamical properties of a simple model of material flow networks defined on random graphs. In particular we address instabilities that are characteristic of flow networks in economic, ecological and biological systems. Based on results from random matrix theory, we work out the phase diagram of such systems defined on extensively connected random graphs, and study in detail how the choice of control policies and the network structure affects stability. We also present results for more complex topologies of the underlying graph, focussing on finitely connected Erdös-Réyni graphs, Small-World Networks and Barabási-Albert scale-free networks. Results indicate that variability of input-output matrix elements, and random structures of the underlying graph tend to make the system less stable, while fast price dynamics or strong responsiveness to stock accumulation promote stability.
description: 15 pages, 13 figures
Coding for signals with occasional transients
Creators: name: Reader, William Roland
Publisher: name: University of British Columbia
Year: 2011

description: This investigation is concerned with improvements that can be made in communication systems to enable them to transmit efficiently signals containing occasional transient. A method of improving delta modulation by the use of variable step size is discussed in detail and the design and construction of a suitable coder and step size control unit are described. The results of tests made on the equipment constructed are given. From these results it is concluded that considerably better response to sudden large changes in input signal can be obtained with only slight deterioration in the performance under normal conditions of input signal. The method used to effect this improvement is applicable to more complex modulation schemes.
Medium-modified average multiplicity and multiplicity fluctuations in jets
Creators: name: Ramos, Redamy Perez
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The energy evolution of average multiplicities and multiplicity fluctuations in jets produced in heavy-ion collisions is investigated from a toy QCD-inspired model. In this model, we use modified splitting functions accounting for medium-enhanced radiation of gluons by a fast parton which propagates through the quark gluon plasma. The leading contribution of the standard production of soft hadrons is enhanced by a factor $\sqrt{N_s}$ while next-to-leading order (NLO) corrections are suppressed by $1/\sqrt{N_s}$, where the parameter $N_s>1$ accounts for the induced-soft gluons in the medium. Our results for such global observables are cross-checked and compared with their limits in the vacuum.
description: 8 pages and 4 figures. Version to be published in EPJC
Thickness-dependent spontaneous dewetting morphology of ultrathin Ag films
Creators: name: Krishna, H.
name: Sachan, R.
name: Strader, J.
name: Favazza, C.
name: Khenner, M.
name: Kalyanaraman, Ramki
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We show here that the morphological pathway of spontaneous dewetting of ultrathin Ag films on SiO2 under nanosecond laser melting is found to be film thickness dependent. For films with thickness h between 2 <= h <= 9.5 nm, the morphology during the intermediate stages of dewetting consisted of bicontinuous structures. For films 11.5 <= h <= 20 nm, the intermediate stages consisted of regularly-sized holes. Measurement of the characteristic length scales for different stages of dewetting as a function of film thickness showed a systematic increase, which is consistent with the spinodal dewetting instability over the entire thickness range investigated. This change in morphology with thickness is consistent with observations made previously for polymer films [A. Sharma et al, Phys. Rev. Lett., v81, pp3463 (1998); R. Seemann et al, J. Phys. Cond. Matt., v13, pp4925, (2001)]. Based on the behavior of free energy curvature that incorporates intermolecular forces, we have estimated the morphological transition thickness for the intermolecular forces for Ag on SiO2 . The theory predictions agree well with observations for Ag. These results show that it is possible to form a variety of complex Ag nanomorphologies in a consistent manner, which could be useful in optical applications of Ag surfaces, such as in surface enhanced Raman sensing.
description: 20 pages, 5 figures
Remembering the New International Economic Order: On the Loss of the Global Socialist and Anticolonial Revolutionary Project
Creators: name: Jain, Sparsh
Publisher: name: University of Chicago
Year: 2023
Subjects: subject: The New International Economic Order
subject: Reparations
subject: Anti-colonialism
subject: Anti-imperialism
subject: Third Worldism

description: The end of the twentieth century saw the collapse of the global socialist and anticolonial revolutionary project. In its wake, citizens across the world, especially on the Left, found themselves without a future to look forward to, stranded in the present, amidst the ruins of the past. As the failings of the post-Cold War neoliberal economic order have become increasingly clear, there has been growing interest in the idea of reviving a now forgotten policy from almost half a century ago: the New International Economic Order (NIEO). While this essay begins by discussing the prospect of reviving the NIEO, it is this tension between the Bandung era and its romantic yearning for total revolution and the neoliberal era and the accompanying loss of futures that is of particular interest. This essay argues that the project of reviving the NIEO relies on a set of concepts, terms, and temporal arrangements that are no longer available in the postcolonial neoliberal present. Thus, the central motivating question of this paper regards the type of relationship we can have with a past that no longer speaks to our present. While this essay argues that revival is no longer an option, it also argues against forgetting projects like the NIEO and the tradition of global socialist and anticolonial revolution that they drew from. Instead, this essay makes an argument for remembrance, which exists within a space between reviving and forgetting that allows us to maintain a connection with the past while freeing us to develop new ways of dealing with the challenges of the postcolonial neoliberal present.
Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe2-xNixAs2
Creators: name: Kumar, Neeraj
name: Chi, Songxue
name: Chen, Ying
name: Rana, Gaurav
name: Nigam, A. K.
name: Thamizhavel, A.
name: Ratcliff, William
name: Dhar, S. K.
name: Lynn, Jeffrey W.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Magnetization, susceptibility, specific heat, resistivity, neutron and x-ray diffraction have been used to characterize the properties of single crystalline CaFe2-xNixAs2 as a function of Ni doping for x varying from 0 to 0.1. The combined first-order structural and magnetic phase transitions occur together in the undoped system at 172 K, with a small decrease in the area of the a-b plane along with an abrupt increase in the length of the c-axis in the orthorhombic phase. With increasing x the ordered moment and transition temperature decrease, but the transition remains sharp at modest doping while the area of the a-b plane quickly decreases and then saturates. Warming and cooling data in the resistivity and neutron diffraction indicate hysteresis of ~2 K. At larger doping the transition is more rounded, and decreases to zero for x=0.06. The susceptibility is anisotropic for all values of x. Electrical resistivity for x = 0.053 and 0.06 shows a superconducting transition with an onset of nearly 15 K which is further corroborated by substantial diamagnetic susceptibility. For the fully superconducting sample there is no long range magnetic order and the structure remains tetragonal at all temperature, but there is an anomalous increase in the area of the a-b plane in going to low T. Heat capacity data show that the density of states at the Fermi level increases for x > 0.053 as inferred from the value of Sommerfeld coefficient. The regime of superconductivity is quite restrictive, with a maximum TC of 15 K and an upper critical field Hc2=14 T. Superconductivity disappears in the overdoped region.
description: 14 pages, 12 figures. Submitted to Phys. Rev. B
Growth and Decay in Life-Like Cellular Automata
Creators: name: Eppstein, David
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: FOS: Physical sciences

description: We propose a four-way classification of two-dimensional semi-totalistic cellular automata that is different than Wolfram's, based on two questions with yes-or-no answers: do there exist patterns that eventually escape any finite bounding box placed around them? And do there exist patterns that die out completely? If both of these conditions are true, then a cellular automaton rule is likely to support spaceships, small patterns that move and that form the building blocks of many of the more complex patterns that are known for Life. If one or both of these conditions is not true, then there may still be phenomena of interest supported by the given cellular automaton rule, but we will have to look harder for them. Although our classification is very crude, we argue that it is more objective than Wolfram's (due to the greater ease of determining a rigorous answer to these questions), more predictive (as we can classify large groups of rules without observing them individually), and more accurate in focusing attention on rules likely to support patterns with complex behavior. We support these assertions by surveying a number of known cellular automaton rules.
description: 30 pages, 23 figures
Large-Distance Asymptotic Behavior of the Correlation Functions of 1D Impenetrable Anyons at Finite Temperatures
Creators: name: Patu, Ovidiu I.
name: Korepin, Vladimir E.
name: Averin, Dmitri V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The large-distance asymptotic behavior of the field-field correlators has been computed for one-dimensional impenetrable anyons at finite temperatures. The asymptotic behavior agrees with the predictions of conformal field theory at low temperatures and reproduces the known results for impenetrable bosons and free fermions in appropriate limits. We have also obtained an integrable system of partial nonlinear differential equations which completely characterizes the 2-point correlation functions. The system is the same as for bosons but with different initial conditions.
description: 5 pages, RevTeX4
The jamming transition as probed by quasistatic shear flow
Creators: name: Heussinger, Claus
name: Barrat, Jean-Louis
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the rheology of amorphous packings of soft, frictionless particles close to jamming. Implementing a quasistatic simulation method we generate a well defined ensemble of states that directly samples the system at its yield-stress. A continuous jamming transition from a freely-flowing state to a yield stress situation takes place at a well defined packing fraction, where the scaling laws characteristic of isostatic solids are observed. We propose that long-range correlations observed below the transition are dominated by this isostatic point, while those that are observed above the transition are characteristic of dense, disordered elastic media.
description: 4 pages, 6 figures, revised version
Measurement of the Ratio of Branching Fractions Br(B+ -> JPsi pi+)/Br(B+ ->JPsi K+)
Creators: name: etal, A. Abulencia
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report a measurement of the ratio of branching fractions of the decays B+ ->JPsi pi+ and B+ -> Jpsi K+ using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B+->JPsi pi+ decay is separated from B+->JPsi K+ using the invariant mass distribution and the kinematics differences of the hadron track in the two decay modes. From a sample of 220 pb^-1 of pbar-p collisions at sqrt(s)= 1.96 TeV, we observe 91 +- 15 B+->JPsi pi+ events together with 1883 +- 34 B+->JPsi K+ events. The ratio of branching fractions is found to be Br(B+ -> JPsi pi+)/Br(B+ ->JPsi K+) = (4.86 +- 0.82(stat.) +- 0.15(syst.)) %.
Nursing interventions for fall prevention in women who receive maternity care: a scoping review protocol
Creators: name: Sá, Luís
name: Risso, Sandra
name: Vieira, Cristina Maria Alves Marques
name: Soares, Tânia Vieira
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Medicine and Health Sciences
subject: Maternal, Child Health and Neonatal Nursing
subject: Nursing
subject: FOS: Health sciences
subject: Nursing Midwifery

description: To map nursing interventions for fall prevention in women who receive maternity care.
A hybrid-coupled tunnel-diode amplifier
Creators: name: Holland, John Henry
Publisher: name: University of British Columbia
Year: 2011

description: The analysis and design of a hybrid-coupled tunnel-diode amplifier is described, considering both the hybrid junction and the tunnel-diode circuitry. The fundamental theory of the tunnel diode is reviewed. The hybrid junction is in the form of a strip-line directional coupler which makes use of the inherent contra-directional coupling between two adjacent transmission lines. A complete analysis of the frequency dependence of the response of such a coupler is given. The amplifier is realized using the coupler and a pair of matched diodes terminating mutually isolated ports. To optimize the performance of this type of amplifier the design of the coupler is integrated with the design of the diode circuit. In doing so, account is taken of the frequency dependence of the hybrid junction, an aspect of the problem which has not been treated in the literature. As an example, an amplifier covering the VHF television channels is designed, and experimental results of a working model for a 50-ohm system are presented. The amplifier uses the periodicity of the directional coupler to provide two pass bands spanning Channels 2 to 6 (54 to 88 Mc) and Channels 7 to 12 (174 to 216 Mc), respectively. The two GE lN2939A tunnel diodes used for the amplifier provide a gain of 7.8 db ± 0.3 db for the lower band and 8.9 db ± 0.45 db for the upper band. The maximum input VSWR for the lower and upper bands are less than 2.3 and 3.2, respectively. The theoretical noise figure for a bias current of 0.7 ma is 3.79 db. It is found that the experimental results are in general agreement with the theory. Suggestions for improvement are given in cases where discrepancies do occur.
Additional file 1 of Sleep traits and risk of end-stage renal disease: a mendelian randomization study
Creators: name: Li, Kaixin
name: Zhao, Jiaxi
name: Yang, Wenjing
name: Ye, Zhibin
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Cancer

description: Supplementary Material 1
Emission-lines calibrations of the Star Formation Rate from the Sloan Digital Sky Survey
Creators: name: Argence, B.
name: Lamareille, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Our goal is to study the existing star formation rate calibrations based on emission-line luminosities and to provide new ones. We use the SDSS data release DR4, which gives star formation rates and emission-line luminosities of more than 100000 star-forming galaxies. We confirm that the best results are obtained with the Halpha calibration. This calibration has an uncertainty of 0.17 dex. We show that one has to check carefully the method used to derive the dust attenuation and to use the adequate calibration: in some cases, the standard scaling law has to be replaced by a more general power law. When data is corrected for dust attenuation but the Halpha emission line not observed, the use of the Hbeta emission line, has to be preferred to the [OII]3727 emission line. In the case of uncorrected data, the correction for dust attenuation can be assumed as a constant value but we show that such method leads to poor results, in terms of dispersion and residual slope. Self-consistent corrections, based e.g. on the absolute magnitude, give better results in terms of dispersion but still suffer from systematic shifts, and/or residual slopes. The best results with data not corrected for dust attenuation are obtained when using the observed [OII]3727 and Hbeta emission lines together. This calibration has an uncertainty of 0.23 dex.
Genetic Modifiers of Neurotoxicity in a Drosophila Model of Parkinson’s Disease
Creators: name: Devara, Davin
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Parkinson’s
Drosophila
Neurotoxicity
Behavior
Rotenone

description: Parkinson’s Disease (PD) is a neurological motor disorder that stems from the death of dopaminergic neurons in the substantia nigra, a region of the midbrain. In the United States, it is prevalent in 1% of people over 60 years of age. Rotenone is a compound that is known to induce PD-like symptoms via direct inhibition of Complex 1 in the mitochondria, leading to the formation of reactive oxygen species (ROS) and cell death in dopaminergic neurons. In Drosophila melanogaster, exposure to rotenone leads to locomotor impairments like those found in PD and has previously been used to model PD in flies. In this study, we used rotenone to induce PD-like symptoms in a subset of the Drosophila Genetic Reference Panel (DGRP) lines, which have known, unique polymorphisms. We assessed the effects of rotenone using a locomotive behavioral assay and compared DGRP lines to identify genetic variants that contribute to rotenone sensitivity. This means that a difference in assay performance can be attributed to the different genotype, so we can compare the polymorphisms between the fly lines and identify which mutation(s) may be responsible. We found 30 single nucleotide polymorphisms that are significantly associated with differential rotenone sensitivity, potentially providing insight into genetic factors associated with PD.
title: Das Menschenrechtsmandat in der Sozialen Arbeit : die Ambivalenzen des Fundaments der Profession
title: The human rights mandate in social work : the ambivalences of the profession's foundation
Creators: name: Mahlich, Ralf
Publisher: name: BTU  Cottbus - Senftenberg
Year: 2022
Subjects: subject: 36 Soziale Probleme, Sozialdienste

description: Auseinandersetzungen um Menschenwürde und Menschenrechte finden sich seit vielen Dekaden in unterschiedlichen philosophischen, politischen und religiösen Strömungen. Diese Auseinandersetzungen werden im Folgenden umrissen. Dabei wird der postkolonialen Kritik am westlichen Wissenskanon zum Entstehen der Menschenrechte besondere Beachtung gegeben; um im weiteren Verlauf die Frage zu diskutieren, in wie fern die bereits von Hannah Arendt thematisierte Wirkungslosigkeit der Menschrechte für Geflüchtete in der epistemischen Dominanz verankert ist und sich im methodologischen Nationalismus der Sozialen Arbeit fortsetzt. Außerdem ist nach weiteren historischen und aktuellen Prozessen der Hierarchisierung von Rechten für Menschen zu fragen, die im Kontext von Sozialer Arbeit eine Bedeutung haben.
description: Controversies about human dignity and human rights have been found in various philosophical, political, and religious currents for many decades. These disputes are outlined below. Special attention will be given to the postcolonial critique of the Western canon of knowledge on the emergence of human rights; in order to further discuss the question of how far the ineffectiveness of human rights for refugees, already thematized by Hannah Arendt, is anchored in epistemic dominance and continues in the methodological nationalism of social work. It is also necessary to ask about further historical and ongoing processes of hierarchizing rights for people that are relevant in the context of social work.
description: MIKOWA Arbeitspapiere; 5,2021
Dynamical instabilities of warm $npe^-$ matter: the $δ$ meson effects
Creators: name: Pais, Helena
name: Santos, Alexandre
name: Providência, Constança
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The effects of $δ$ mesons on the dynamical instabilities of cold and warm nuclear and stellar matter at subsaturation densities are studied in the framework of relativistic mean-field hadron models (NL3, NL$ρ$ and NL$ρδ$) with the inclusion of the electromagnetic field. The distillation effect and the spinodals for all the models considered are discussed. The crust-core transition density and pressure are obtained as a function of temperature for $β$-equilibrium matter with and without neutrino trapping. An estimation of the size of the clusters formed in the non-homogeneous phase is made. It is shown that cluster sizes increase with temperature. The effects of the $δ$-meson on the instability region are larger for low temperatures, very asymmetric matter and densities close to the spinodal surface. It increases the distillation effect above $\sim 0.4ρ_0$ and has the opposite effect below that density.
description: Submitted to Phys. Rev. C
LIGHT FOUR-QUARK STATES WITH J^pc=1^--
Creators: name: A. U. BADALYAN
Publisher: name: INFN Open Access Repository
Year: 1991

description: The masses of P-wave q^2-q^2 states are reviewed. Starting from QCD it is shown that the interquark confining forces are not of pairwise type as it is usually suggested in potential models, but can be described by means of string junction configuration. Masses of P-wave q^2-q^2 systems obtained lie lower that it was predicted in the bag and potential models.
A THEORETICAL STUDY OF THE c AND b FRAGMENTATION FUNCTION IN e+e- ANNIHILATION
Creators: name: G. COLANGELO
name: P. NASON
Publisher: name: INFN Open Access Repository
Year: 1992

description: we present an analysis of the c and b fragmentation functions which includes in a consistent fashion leading and next-to-leading perturbative contributions, effects due to soft gluon emission and a parametrization of effects of non-perturbative origin. We show that the data on D meson production at intermediate energy constrains the parametrization of the effects of non-perturbative nature. We can therefore make a prediction for the B fragmentation functions at LEP energy are given, and compared with existing data.
Photoproduction of High -PT  Jets in Next-to-Leading Order QCD
Creators: name: M. Greco
name: A. Vicini
Publisher: name: INFN Open Access Repository
Year: 1993

description: Theh photoproduction of high pt jets at HERA energies is considered in next-to-leading order perturbative QCD. The cancellation of O(\\alpha_em\\alpha^2_S) dependence of the cross section on the factorisation scale M_\\gamma of the collinear singularities of the photon is shown explicity to occur when the direct and resolved photon terms are both considered. A detailed numerical analysis is presented and compared with previous studies, showing that the theoretical predictions are affected by large uncertainties related to the poorly known photon structure functions. Sizeable numerical differences in the analyses published so far are also emphasized.
Potential and limitations of the HBT method
Creators: name: Zalewski, K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The HBT method is used to get information about the sizes, shapes and sometimes also about the time evolution of the homogeneity regions in hadroproduction processes. Homogeneity region K is the region where the hadrons with momentum K are produced. The size and shape of he homogeneity region is described by the Wigner function W(K,X) evaluated in the interaction picture after all the hadrons had been produced. Additional information about the interaction region is contained in the emission functio S(K,X). A theorem is presented and discussed which specifies which of the parameters characterizing the Wigner functin can and which cannot be obtained using the HBT method. In order to obtain the complete Wigner fuction additional assumptions are needed. For instance, it is enough to know the distribution of the centers of the homogeneity regions _K. In order to find the emission function further assumptions are required. No systematic analysis is available, but some instructive examples are discussed.
description: 12 pages, no figures
Design Triggers for Excessive Online Video Clip Watching
Creators: name: Kloker, Simon
name: Greif-Winzrieth, Anke
Publisher: name: University of Hawaii at Manoa
Year: 2020

description: Addiction in the context of information technology gained increased public interest within the last years. Only recently, companies like Apple, Google, or Instagram announced to fight “Smartphone Addiction” and integrated respective features in their systems. However, if and how such features help is still an open question. Right now, there is only a very rudimentary understanding of addictions in information systems and “IT-triggered disorders''. Even in clinical research, there is no consensus on the nature of such addictions yet. This work researches how design adaptations interfere with “Excessive Online Video Clip Watching”. We base our assumptions on the reinforcement cycle of disorder development and the Four-Component Model for Non-addictive Information Systems (4-NAIS). A study with 186 participants is performed, indicating that bridging findings from Psychology and Neurosciences to Information Systems is necessary to design information systems that are capable of tackling the problem of “IT-triggered disorders”.
Ising Spin Glasses on Wheatstone-Bridge Hierarchical Lattices
Creators: name: Salmon, Octavio D. R.
name: Agostini, B. T.
name: Nobre, F. D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Nearest-neighbor-interaction Ising spin glasses are studied on three different hierarchical lattices, all of them belonging to the Wheatstone-Bridge family. It is shown that the spin-glass lower critical dimension in these lattices should be greater than 2.32. Finite-temperature spin-glass phases are found for a lattice of fractal dimension $D \approx 3.58$ (whose unit cell is obtained from a simple construction of a part of the cubic lattice), as well as for a lattice of fractal dimension close to five.
description: Accepted for publication in Physics Letters A
Two Photon Reactions Beyond One  Loop
Creators: name: S. Bellucci
Publisher: name: INFN Open Access Repository
Year: 1994

description: We review the recent progress in the calculation of the amplitude for γγ→π^0 π^0 to two loops in chiral perturbation theory. We match the low-energy amplitude in chiral perturbation theory with the result of the dispersion theoretic analysis. The neutral pion polarizabilities are also given to two-loop accuracy. Then, the results are compared with the dispersion relation calculation of the pion polarizabilities.
Pushing off the walls: a mechanism of cell motility in confinement
Creators: name: Hawkins, R. J.
name: Piel, M.
name: Faure-Andre, G.
name: Lennon-Dumenil, A. M.
name: Joanny, J. F.
name: Prost, J.
name: Voituriez, R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We propose a novel mechanism of cell motility, which relies on the coupling of actin polymerization at the cell membrane to geometric confinement. We consider a polymerizing viscoelastic cytoskeletal gel confined in a narrow channel, and show analytically that spontaneous motion occurs. Interestingly, this does not require specific adhesion with the channel walls, and yields velocities potentially larger than the polymerization velocity. The contractile activity of myosin motors is not necessary to trigger motility in this mechanism, but is shown quantitatively to increase the velocity. Our model qualitatively accounts for recent experiments which show that cells without specific adhesion proteins are motile only in confined environments while they are unable to move on a flat surface, and could help in understanding the mechanisms of cell migration in more complex confined geometries such as living tissues.
description: 4 pages, 3 figures
Proton Electromagnetic Time-Like form Factors Updated at Threshold
Creators: name: B.L.Druzhinin
name: A.E. Kudryavtsev
name: E. Pascqualucci
Publisher: name: INFN Open Access Repository
Year: 1997

description: A revised expression for the electromagnetic form factor of the proton in time-like region (p2>0) near threshold is given. Recent data on p antip annihilation cross section as well as the well-known p`p-branching into e+e--pairs from atomic states are used to extract the value of form factor at threshold (s=q2=4m2p). At this point |Gp(4m2p)|=0.41+0.02-0.08.
Spatial Resolution in Optical Transition Radiation (OTR) Beam Diagnostics
Creators: name: M. Castellano
name: V.A. Verzilov
Publisher: name: INFN Open Access Repository
Year: 1998

description: An evaluation of the OTR single particle image dimension is obtained using diffraction theory based on a realistic description of the radiation source. This approach allows the analysis of the effect of the finite size of the emitting screen and of the imaging system. The role of practical experimental conditions in  treating the intensity tail problem is estimated. It is shown that by exploiting the polarization properties of OTR, a considerable enhancement in the spatial resolution can be achieved, which becomes very similar to that of a standard point source.
Partial Breaking of N=1, D=10 Supersymmetry
Creators: name: S. Bellucci
name: E. Ivanov
name: S. Krivonos
Publisher: name: INFN Open Access Repository
Year: 1999

description: We describe the spontaneous partial breaking of N=1,D=10 supersymmetry to N=(1,0),d=6 and its dimensionally-reduced versions in the framework of nonlinear realizations. The basic Goldstone superfield is N=(1,0),d=6 hypermultiplet superfield satisfying a nonlinear generalization of the standard hypermultiplet constraint. We interpret the generalized constraint as the manifestly worldvolume supersymmetric form of equations of motion of the type I super 5-brane in D=10. The related issues we address are a possible existence of brane extension of off-shell hypermultiplet actions, the possibility to utilize vector N=(1,0), d=6 supermultiplet as the Goldstone one, and the description of 1/4 breaking of N=1,D=11 supersymmetry.
Individual addressing of ions using magnetic field gradients in a surface-electrode ion trap
Creators: name: Wang, Shannon X.
name: Labaziewicz, Jaroslaw
name: Ge, Yufei
name: Shewmon, Ruth
name: Chuang, Isaac L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Dense array of ions in microfabricated traps represent one possible way to scale up ion trap quantum computing. The ability to address individual ions is an important component of such a scheme. We demonstrate individual addressing of trapped ions in a microfabricated surface-electrode trap using a magnetic field gradient generated on-chip. A frequency splitting of 310(2) kHz for two ions separated by 5 um is achieved. Selective single qubit operations are performed on one of two trapped ions with an average of 2.2+/-1.0% crosstalk. Coherence time as measured by the spin-echo technique is unaffected by the field gradient.
description: 3 pages, 3 figures; submitted to APL
A Reproducible Method to Achieve Very High (Over 1:1) H/PD Loading Ratio Using Thin Wires in Acidic Solution with Addition of Very Low Concentration Impurities
Creators: name: A. Spallone
name: F. Celani
name: P. Marini
name: V. Di Stefano
Publisher: name: INFN Open Access Repository
Year: 2000

description: A peculiar electrolytic protocol has been determinate to achieve very high Hydrogen loading into a thin Palladium wire (H/Pd= 1): electrolysis (with high/low current cycles) has been performed with a very diluted acidic solution (H2O+HCl) adding a very small quantity of alkaline/earth or heavy metal elements (Sr and/or Hg). A systematic study has been performed with these elements (added to the electrolyte) in order to have a controlled loading dynamics. The aim and the result of this study has been to reproduce H/Pd * 1 loading value, just using very low electrolysis voltage and current (7V, 5mA).Other two independent Research Groups have tested this protocol reproducing similar results.
Equations of the Camassa-Holm Hierarchy
Creators: name: Ivanov, Rossen I.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: The squared eigenfunctions of the spectral problem associated with the Camassa-Holm (CH) equation represent a complete basis of functions, which helps to describe the inverse scattering transform for the CH hierarchy as a generalized Fourier transform (GFT). All the fundamental properties of the CH equation, such as the integrals of motion, the description of the equations of the whole hierarchy, and their Hamiltonian structures, can be naturally expressed using the completeness relation and the recursion operator, whose eigenfunctions are the squared solutions. Using the GFT, we explicitly describe some members of the CH hierarchy, including integrable deformations for the CH equation. We also show that solutions of some $(1+2)$ - dimensional members of the CH hierarchy can be constructed using results for the inverse scattering transform for the CH equation. We give an example of the peakon solution of one such equation.
description: 10 pages
Modeling catalytic mechanisms in carbohydrate-active enzymes with QM/MM MD methods
Creators: name: Rovira, Carme
Publisher: name: Zenodo
Year: 2021
Subjects: QM/MM
BioExcel Virtual Workshop on Best Practices in QM/MM Simulation of Biomolecular Systems

description: Part of the BioExcel Virtual Workshop on Best Practices in QM/MM Simulation of Biomolecular Systems Video recording available at https://www.youtube.com/watch?v=mojq6K6N7UM Abstract Carbohydrate-active enzymes (CAZymes) are the focus of enormous interest due to the critically important roles that complex glycans play in health and disease. Nature has devised several mechanisms to form and break glycosidic bonds in carbohydrates, via the action efficient enzymes named glycoside hydrolases (GHs) and glycosyltransferases [1,2,3]. In this webinar I show two examples of applications of the QM/MM MD approach to the modeling of CAZymes. I focus on two GHs that catalyze the hydrolysis of carbohydrates via unconventional sugar conformations: endo-β-1,4-mannanase [4] and β-galactocerebrosidase [5]. Tips and tricks related to QM/MM simulations of CAZymes are discussed [6]. References [1] A. Ardèvol, C. Rovira, J. Am. Chem. Soc. 2015, 137, 7528-7547
 [2] G. J. Davies, A. Planas, C. Rovira, Acc. Chem. Res. 2012, 45, 308-316
 [3] J. Coines, L. Raich, C. Rovira. Curr. Opin. Chem. Biol. 2019, 53, 183-191
 [4] Y. Jin, M. Petricevic, A. John, L. Raich, H. Jenkins, L. Portela De Souza, F. Cuskin, H. J. Gilbert, C. Rovira, E. D. Goddard-Borger, S. J. Williams, G. J. Davies. ACS Cent. Sci. 2016, 2, 896-903
 [5] A. Nin-Hill, C. Rovira. ACS Catal. 2020, 10, 12091-12097
 [6] L. Raich, A. Nin-Hill, A. Ardèvol, C. Rovira. Meth. Enzymol. 2016, 577, 159-183
Light-front projections of the Bethe-Salpeter amplitude and the 4D electromagnetic current for an interacting two-fermion system
Creators: name: Frederico, T.
name: Marinho, J. A. O.
name: Pace, E.
name: Salmé, G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A recent approach for constructing an exact 3D reduction of the 4D matrix elements of the electromagnetic current for an interacting two-fermion system, is briefly reviewed. The properties of the obtained 3D current, like the fulfillment of the Ward-Takashi Identity and its Fock decomposition, will be illustrated in relation with future applications to few-nucleon systems.
description: 8 pages, 1 Fig. Suitable. cls added. Proceedings of 12th Conference on 'Theoretical Nuclear Physics in Italy', Cortona, October 2008
Giant Magnons in AdS4 x CP3: Embeddings, Charges and a Hamiltonian
Creators: name: Abbott, Michael C.
name: Aniceto, Inês
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This paper studies giant magnons in CP3, which in all known cases are old solutions from S5 placed into two- and three-dimensional subspaces of CP3, namely CP1, RP2 and RP3. We clarify some points about these subspaces, and other potentially interesting three- and four-dimensional subspaces. After confirming that E-(J1-J4)/2 is a Hamiltonian for small fluctuations of the relevant 'vacuum' point particle solution, we use it to calculate the dispersion relation of each of the inequivalent giant magnons. We comment on the embedding of finite-J solutions, and use these to compare string solutions to giant magnons in the algebraic curve.
description: 17 pages (plus appendices) and 1 figure. v2 has new discussion of placing finite-J giant magnons into CP^3, adds many references, and corrects a few typos
On Robin boundary conditions and the Morse potential in quantum mechanics
Creators: name: Belchev, B.
name: Walton, M. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The physical origin is investigated of Robin boundary conditions for wave functions at an infinite reflecting wall. We consider both Schrödinger and phase-space quantum mechanics (a.k.a. deformation quantization), for this simple example of a contact interaction. A non-relativistic particle moving freely on the half-line is treated as moving on the full line in the presence of an infinite potential wall, realized as a limit of a Morse potential. We show that the wave functions for the Morse states can become those for a free particle on the half-line with Robin boundary conditions. However, Dirichlet boundary conditions (standard walls) are obtained unless a mass-dependent fine tuning (to a reflection resonance) is imposed. This phenomenon was already observed for piece-wise flat potentials, so it is not removed by smoothing. We argue that it explains why standard quantum walls are standard. Next we consider the Wigner functions (the symbols of both diagonal and off-diagonal density operator elements) of phase-space quantum mechanics. Taking the (fine-tuned) limit, we show that our Wigner functions do reduce to the expected ones on the half-line. This confirms that the Wigner transform should indeed be unmodified for this contact interaction.
description: 19 pages
Topological regularization and self-duality in four-dimensional anti-de Sitter gravity
Creators: name: Miskovic, Olivera
name: Olea, Rodrigo
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is shown that the addition of a topological invariant (Gauss-Bonnet term) to the anti-de Sitter (AdS) gravity action in four dimensions recovers the standard regularization given by holographic renormalization procedure. This crucial step makes possible the inclusion of an odd parity invariant (Pontryagin term) whose coupling is fixed by demanding an asymptotic (anti) self-dual condition on the Weyl tensor. This argument allows to find the dual point of the theory where the holographic stress tensor is related to the boundary Cotton tensor as $T_{j}^{i}=\pm (\ell ^{2}/8πG)C_{j}^{i}$, which has been observed in recent literature in solitonic solutions and hydrodynamic models. A general procedure to generate the counterterm series for AdS gravity in any even dimension from the corresponding Euler term is also briefly discussed.
description: 13 pages, no figures; enlarged discussion on self-duality condition for AAdS spacetimes, references added, final version for PRD
Some combinatorial properties of matrices
Creators: name: Wales, David Bertram
Publisher: name: University of British Columbia
Year: 2011

description: Three combinatorial problems in matrix theory are considered in this thesis. In the first problem the structure of 0-1 matrices with permanent 1, 2, or 3, is analysed. It is shown that a 0-1 matrix whose permanent is a prime number p can be brought by permutations of rows and columns into a subdirect sum of 1 -square matrices (1) and a fully indecomposable 0-1 matrix with permanent p. The structure of fully indecomposable 0-1 matrices with permanent 1, 2, or 3, is then determined. It is found that the only fully indecomposable 0-1 matrix with permanent 1 is the 1-square matrix (1); and fully indecomposable 0-1 matrices with permanent 2 are I + K to within permutations of the rows and columns, where I is the identity matrix and K is the full cycle permutation matrix. The structure of fully indecomposable 0-1 matrices with permanent 3 is also described. In the second problem relationships are considered between two 0-1 matrices given certain connections between their corresponding principal submatrices. The matrices considered are 0-1 n-square symmetric matrices with zeros on the main diagonal. One of the theorems proved states that if two of these matrices have the same number of ones in corresponding (n - 2)-square principal submatrices, then the two matrices are identical. In the third problem the set of matrices G is determined. By definition G is the set of all n-square matrices A such that for any n-square permutation matrix P there exists a doubly stochastic matrix B such that PA = AB. It is shown that for non-singular matrices in G, the doubly stochastic matrix B must be a permutation matrix. The set of non-singular matrices in G is then determined by considering left multiplication of A by permutation matrices Pij. It is proved that G consists of the set of matrices with identical rows together with the set of matrices of the form αP + βJ where J is the n-square matrix with all entries 1, and α, β are scalars.
Electoral Integrity, Citizens and ICT in Melanesia
Creators: name: Logan, Sarah
Publisher: name: Canberra, ACT : Coral Bell School of Asia Pacific Affairs, College of Asia and the Pacific, The Australian National University
Year: 2014

description: This year is a landmark year for elections in Solomon Islands and Fiji. In August, Solomon Islands will go to the polls for the first time since the withdrawal of the military component of Regional Assistance Mission to Solomon Islands, and the elections will for the first time be based on voter registration undertaken using a biometric roll. Elections to be held in Fiji in September are likely to be far more contentious. These elections will be the first since the military coup of 2006, and will involve significant numbers of the younger generation voting for the first time and ongoing uncertainty and confusion around the promised electoral Act.