cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Symmetries for scalarless scalar theories
Creators: name: Tasinato, Gianmassimo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider theories containing scalar fields interacting with vector or with tensor degrees of freedom, equipped with symmetries that prevent the propagation of linearized scalar excitations around solutions of the equations of motion. We first study the implications of such symmetries for building vector theories that break Abelian gauge invariance without necessarily exciting longitudinal scalar fluctuations in flat space. We then examine scalar-tensor theories in curved space, and relate the symmetries we consider with a non-linear realization of broken space-time symmetries acting on scalar modes. We determine sufficient conditions on the space-time geometry to avoid the propagation of scalar fluctuations. We analyze linearized perturbations around spherically symmetric black holes, proving the absence of scalar excitations, and pointing out modifications in the dynamics of spin-2 fluctuations with respect to Einstein gravity. We then study consequences of this set-up for the dark energy problem, determining scalar constraints on cosmological configurations that can lead to self-accelerating universes whose expansion is insensitive to the value of the bare cosmological constant.
description: 27 pages. References added, to appear in PRD
General relativity, gravitational energy and spin-two field
Creators: name: Sokołowski, Leszek M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In my lectures I will deal with three seemingly unrelated problems: i) to what extent is general relativity exceptional among metric gravity theories? ii) is it possible to define gravitational energy density applying field-theory approach to gravity? and iii) can a consistent theory of a gravitationally interacting spin-two field be developed at all? The connecting link to them is the concept of a fundamental spin-2 field. A linear spin-2 field encounters insurmountable inconsistencies when coupled to gravity. After discussing the inconsistencies of any coupling of the linear spin-2 field to gravity, I exhibit the origin of the fact that a gauge invariant field has the variational metric stress tensor which is gauge dependent. I give a general theorem explaining under what conditions a symmetry of a field Lagrangian becomes also the symmetry of the stress tensor. It is a conclusion of the theorem that any attempt to define gravitational energy density in the framework of a field theory of gravity must fail. Finally I make a very brief introduction to basic concepts of how a certain kind of a necessarily nonlinear spin-2 field arises in a natural way from vacuum higher derivative gravity theories. This specific spin-2 field consistently interacts gravitationally.
description: 27 pages, lectures given at the 42nd Karpacz Winter School of Theoretical Physics, Ladek, Poland, February 6-11, 2006
On the interaction of microquasar jets with stellar winds
Creators: name: Perucho, M.
name: Bosch-Ramon, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Strong interactions between jets and stellar winds at binary system spatial scales could occur in high-mass microquasars. We study here, mainly from a dynamical but also a radiative point of view, the collision between a dense stellar wind and a mildly relativistic hydrodynamical jet of supersonic nature.}{We have performed numerical 2-dimensional simulations of jets, with cylindrical and planar (slab) symmetry, crossing the stellar wind material. From the results of the simulations, we derive estimates of the particle acceleration efficiency, using first order Fermi acceleration theory, and give some insight on the possible radiative outcomes. We find that, during jet launching, the jet head generates a strong shock in the wind. During and after this process, strong recollimation shocks can occur due to the initial overpressure of the jet with its environment. The conditions in all these shocks are convenient to accelerate particles up to $\sim$ TeV energies, which can lead to leptonic (synchrotron and inverse Compton) and hadronic (proton-proton) radiation. In principle, the cylindrical jet simulations show that the jet is stable, and can escape from the system even for relatively low power. However, when accounting for the wind ram pressure, the jet can be bent and disrupted for power $\la 10^{36}$ erg s$^{-1}$.
description: Accepted for publication in Astronomy & Astrophysics
title: Monstrous Women: Adaptation as Humanization
Creators: name: Greene, Amie
Publisher: name: University of Nevada, Las Vegas
publisherIdentifier: https://ror.org/0406gha72
publisherIdentifierScheme: ROR
Year: 2024

description: In recent years there has been a rise of retellings of Greek myths which have recaptured the imagination of contemporary readers, greatly propelled by social media. Many of these retellings center female and LGBTQIA+ voices which have previously been silenced by ancient authors. This thesis focuses on two of the most maligned women in Greek mythology, Helen of Troy and Medusa, in two recent novels, Daughters of Spart and Stone Blind. Through an application of monster theory and adaptation, both characters are given voice and made “human”.
The short GRB 051210 observed by Swift
Creators: name: La Parola, V.
name: Mangano, V.
name: Zhang, B.
name: Cusumano, G.
name: Mineo, T.
name: Troja, E.
name: Burrows, D. N.
name: Campana, S.
name: Capalbi, M.
name: Chincarini, G.
name: Giommi, P.
name: Moretti, A.
name: Perri, M.
name: Romano, P.
name: Tagliaferri, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the short GRB051210 detected by the Swift-BAT. The light curve, on which we focus mainly, shows a hint of extended emission in the BAT energy range, a steep decay of the X-ray emission, without any flattening or break, and two small flares in the first 300 sec. The emission fades out after ~1000 s.
description: 2 pages, 1 figure. Proceedings of "SWIFT and GRBs: Unveiling the Relativistic Universe" June 5-9, 2006 Venice (Italy)
Differential Calculi on Some Quantum Prehomogeneous Vector Spaces
Creators: name: Sinel'shchikov, S.
name: Stolin, A.
name: Vaksman, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 81R50; 15A75

description: This paper is devoted to study of differential calculi over quadratic algebras, which arise in the theory of quantum bounded symmetric domains. We prove that in the quantum case dimensions of the homogeneous components of the graded vector spaces of k-forms are the same as in the classical case. This result is well-known for quantum matrices. The quadratic algebras, which we consider in the present paper, are q-analogues of the polynomial algebras on prehomogeneous vector spaces of commutative parabolic type. This enables us to prove that the de Rham complex is isomorphic to the dual of a quantum analogue of the generalized Bernstein-Gelfand-Gelfand resolution.
description: LaTeX2e, 51 pages; changed content
Rent a Data Steward: Two Companions for All - a Travelogue from Thuringia
Creators: name: Kirsch, Stefan
name: Lindt, Kevin
Publisher: name: Zenodo
Year: 2025
Subjects: Data Stewards
FOTD
Fellowship of the Data
Forschungsdatenmanagement
FDM
RDM
Research Data Management
Data Stewardship

description: Presentation of the data steward tasks in and beyond the TKFDM pilot project "Rent a Data Steward" at the international RDM Community meeting "Fellowship of the Data" on April 1st and 2nd 2025. The presentation briefly introduces the original project concept and shortly illustrates the experiences made so far, before focusing on those aspects of the work that go beyond the direct collaboration with the participating research groups at Thuringian public universities and universities of applied sciences.
description: Lots of the grayscale images used in the presentation are public domain images derived from publicdomainvectors.org. Most of them have been profligately modified, mixed and disfigured at our pleasure for our presentation.

The inscription on the ring in slide 12 says "Fellowship of the Data". It has been set using the "Greifswalder Tengwar" font by Peter Wiegel, licensed under GNU General Public License (GPL-3.0) and SIL Open Font License (OFL-1.1).
Vicarious traumatization: the politics of women’s caring work
Creators: name: Bettcher, Cynthia Joan
Publisher: name: University of British Columbia
Year: 2009

description: Practitioner self-care is becoming recognized as a fundamental requisite of effective practice Vtrithin the field of child sexual abuse intervention. In this context, it is only recentiy that the impact of working with survivors of trauma (including child sexual abuse), has been acknowledged and explored. However, social services responding to the needs of sexual abuse survivors have been structured in ways which negate the importance of practitioner self-care. Empirically based information from this and other studies which explore the impact on practitioners of working with trauma survivors will promote effective practice through the identification of and response to vicarious trauma. This information is also essential to the education of social work practitioners, the practice and delivery of social work services, and most importantly, to the clients we serve. My qualitative study used a focus group to examine the experiences of five agency-based, female counsellors working with adult survivors of child sexual abuse. The range of their experiences was explored to determine the specific implications, for women, of working with survivor populations. The findings demonstrate support for McCann and Pearlman's (1990) model of vicarious traumatization. All of the women reported negative and positive changes in their lives resulting from the work. Four major themes of experience emerged in the women's descriptions of the ways they have been impacted: heightened self awareness, challenges and changes in world view, dis/connection with others, and finding balance.
Analyzing the Performance of Smart Industry 4.0 Applications on Cloud Computing Systems
Creators: name: Hussain, Razin Farhan
name: Pakravan, Alireza
name: Salehi, Mohsen Amini
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Cloud-based Deep Neural Network (DNN) applications that make latency-sensitive inference are becoming an indispensable part of Industry 4.0. Due to the multi-tenancy and resource heterogeneity, both inherent to the cloud computing environments, the inference time of DNN-based applications are stochastic. Such stochasticity, if not captured, can potentially lead to low Quality of Service (QoS) or even a disaster in critical sectors, such as Oil and Gas industry. To make Industry 4.0 robust, solution architects and researchers need to understand the behavior of DNN-based applications and capture the stochasticity exists in their inference times. Accordingly, in this study, we provide a descriptive analysis of the inference time from two perspectives. First, we perform an application-centric analysis and statistically model the execution time of four categorically different DNN applications on both Amazon and Chameleon clouds. Second, we take a resource-centric approach and analyze a rate-based metric in form of Million Instruction Per Second (MIPS) for heterogeneous machines in the cloud. This non-parametric modeling, achieved via Jackknife and Bootstrap re-sampling methods, provides the confidence interval of MIPS for heterogeneous cloud machines. The findings of this research can be helpful for researchers and cloud solution architects to develop solutions that are robust against the stochastic nature of the inference time of DNN applications in the cloud and can offer a higher QoS to their users and avoid unintended outcomes.
Giant Anisotropic Magneto-Resistance in ferromagnetic atomic contacts
Creators: name: Viret, M.
name: Gabureac, M.
name: Ott, F.
name: Fermon, C.
name: Barreteau, C.
name: Guirado-Lopez, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magneto-resistance is a physical effect of great fundamental and industrial interest since it is the basis for the magnetic field sensors used in computer read-heads and Magnetic Random Access Memories. As device dimensions are reduced, some important physical length scales for magnetism and electrical transport will soon be attained. Ultimately, there is a strong need to know if the physical phenomena responsible for magneto-resistance still hold at the atomic scale. Here, we show that the anisotropy of magneto-resistance is greatly enhanced in atomic size constrictions. We explain this physical effect by a change in the electronic density of states in the junction when the magnetization is rotated, as supported by our ab-initio calculations. This stems from the "spin-orbit coupling" mechanism linking the shape of the orbitals with the spin direction. This sensitively affects the conductance of atomic contacts which is determined by the overlap of the valence orbitals.
description: latex AAMR.tex, 6 files, 5 figures, 4 pages (http://www-drecam.cea.fr/spec/articles/S06/011)
Nature of $\bm{S}$-wave $\bm{NN}$ interaction and dibaryon production at nucleonic resonance thresholds
Creators: name: Kukulin, V. I.
name: Rubtsova, O. A.
name: Platonova, M. N.
name: Pomerantsev, V. N.
name: Clement, H.
name: Skorodko, T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Phase shifts and inelasticity parameters for $NN$ scattering in the partial-wave channels ${}^3S_1$--${}^3D_1$ and ${}^1S_0$ at energies $T_{\rm lab}$ from zero to about 1 GeV are described within a unified $NN$ potential model assuming the formation of isoscalar and isovector dibaryon resonances near the $NN^*(1440)$ threshold. Evidence for these near-threshold resonances is actually found in the recent WASA experiments on single- and double-pion production in $NN$ collisions. There, the excitation of the Roper resonance $N^*(1440)$ exhibits a structure in the energy dependence of the total cross section, which corresponds to the formation of dibaryon states with $I(J^π)=0(1^+)$ and $1(0^+)$ at the $NN^*(1440)$ threshold. These two $S$-wave dibaryon resonances may provide a new insight into the nature of the strong $NN$ interaction at low and intermediate energies.
description: 10 pages, 8 figures
COVID-19 vaccine effectiveness at primary care level in Europe: I-MOVE-COVID-19 generic protocol
Creators: name: Kissling, Esther
name: Rose, Angela MC
name: Valenciano, Marta
Publisher: name: Zenodo
Year: 2021
Subjects: COVID-19
Vaccine effectiveness
I-MOVE-COVID-19
Primary care

description: Generic protocol for measuring COVID-19 vaccine effectiveness at primary care level in Europe - part of the I-MOVE-COVID-19 project
description: This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 101003673.
Photoluminescence of nitrogen-vacancy and silicon-vacancy color centers in phosphorus-doped diamond at room and higher temperatures
Creators: name: Sledz, F.
name: Piccolomo, S.
name: Flatae, A. M.
name: Lagomarsino, S.
name: Rechenberg, R.
name: Becker, M. F.
name: Sciortino, S.
name: Gelli, N.
name: Khramtsov, I. A.
name: Fedyanin, D. Yu.
name: Speranza, G.
name: Giuntini, L.
name: Agio, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Phosphorus-doped diamond is relevant for applications in sensing, optoelectronics and quantum photonics, since the unique optical properties of color centers in diamond can be combined with the n-type conductivity attained by the inclusion of phosphorus. Here, we investigate the photoluminescence signal of the nitrogen-vacancy and silicon-vacancy color centers in phosphorus-doped diamond as a function of temperature starting from ambient conditions up to about 100$^\circ$ Celsius, focusing on the zero-phonon line (ZPL). We find that the wavelength and width of the ZPL of the two color centers exhibit a comparable dependence on temperature, despite the strong difference in the photoluminescence spectra. Moreover, the temperature sensitivity of the ZPL of the silicon-vacancy center is not significantly affected by phosphorus-doping, as we infer by comparison with silicon-vacancy centers in electronic-grade single-crystal diamond.
description: 5 pages, 1 figure
Fundamental spatiotemporal decoherence: a key to solving the conceptual problems of black holes, cosmology and quantum mechanics
Creators: name: Gambini, Rodolfo
name: Porto, Rafael
name: Pullin, Jorge
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Unitarity is a pillar of quantum theory. Nevertheless, it is also a source of several of its conceptual problems. We note that in a world where measurements are relational, as is the case in gravitation, quantum mechanics exhibits a fundamental level of loss of coherence. This can be the key to solving, among others, the puzzles posed by the black hole information paradox, the formation of inhomogeneities in cosmology and the measurement problem in quantum mechanics.
description: 6 pages, Honorable Mention GRF 2006, published version
title: Effect of Slot Dimensions on Aligner Retention
Creators: name: Grahl, Kory
Publisher: name: University of Nevada, Las Vegas
publisherIdentifier: https://ror.org/0406gha72
publisherIdentifierScheme: ROR
Year: 2024

description: Introduction: Orthodontic brackets with rectangular arch wire slots have been historically used for fixed orthodontic treatment and remain as the industry standard. In light of the biomechanical disadvantages of rectangular slot design and the tremendous market demand for clear aligner therapy, a novel orthodontic device system was designed and evaluated. Clear aligner therapy (CAT) as a solo system has another host of compromises and disadvantages which include lesser treatment outcomes and lack of tooth movement accuracy. A novel 3D printed orthodontic trapezoidal slot twin bracket was fabricated to be used as a fixed appliance, as a clear aligner system, and/or a combination of both. Research on this alternative slot form was conducted on aligner retention utilizing varying slot dimensions with the base of slot ranging from 0.014” to 0.018” and top of slot ranging from 0.040” to 0.060”. A 2mm retention attachment and no attachment model were used as an industry comparison/control. Methods: The trapezoidal slot twin bracket (UL5) was fabricated in composite/ceramic hybrid via 3D printed technology. The brackets were bonded to a 3D printed model and scanned using a Trios 3 intraoral scanner. The STL file was then 3D printed using Sprintray 3D printing technology. A vacuum-form using Zendura Flex aligner material was fabricated on the model using a Ministar S pressure forming machine. The aligner was trimmed equal-gingival. A custom uniaxial tensile testing machine was used to measure the force required to remove the aligner from the testing model.
Results: The data collected was compared to each top of slot dimension (0.040”, 0.050”, 0.060”), each base of slot dimension (0.014” or 0.018”), no attachment, and 2mm retention attachment. Two-tailed T-tests showed clinical significance among all categories tested. An ANOVA was conducted to confirm clinical significance among the different slot configurations.
Conclusion: From the data collected, researchers were able to select a slot dimension of choice for further testing of the system.
Multiphysics flow simulations using D3Q19 lattice Boltzmann methods based on central moments
Creators: name: De Rosis, Alessandro
name: Coreixas, Christophe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In a recent work [A. De Rosis, R. Huang, and C. Coreixas, "Universal formulation of central-moments-based lattice Boltzmann method with external forcing for the simulation of multiphysics phenomena", Phys. Fluids 31, 117102 (2019)], a multiple-relaxation-time lattice Boltzmann method (LBM) has been proposed by means of the D3Q27 discretization, where the collision stage is performed in the space of central moments (CMs). These quantities relax towards an elegant Galilean invariant equilibrium, and can also include the effect of external accelerations. Here, we investigate the possibility to adopt a coarser lattice composed of 19 discrete velocities only. The consequences of such a choice are evaluated in terms of accuracy and stability through multiphysics benchmark problems based on single-, multi-phase and magnetohydrodynamics flow simulations. In the end, it is shown that the reduction from 27 to 19 discrete velocities have only little impact on the accuracy and stability of the CM-LBM for moderate Reynolds number flows in the weakly compressible regime.
description: Submitted to Physics of Fluid
Stochastic Density Functional Theory: Real- and Energy-Space Fragmentation for Noise Reduction
Creators: name: Chen, Ming
name: Baer, Roi
name: Neuhauser, Daniel
name: Rabani, Eran
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Stochastic density functional theory (sDFT) is becoming a valuable tool for studying ground state properties of extended materials. The computational complexity of describing the Kohn-Sham orbitals is replaced by introducing a set of random (stochastic) orbitals leading to linear and often sub-linear scaling of certain ground-state observable at the account of introducing a statistical error. Schemes to reduce the noise are essential, for example, for determining the structure using the forces obtained from sDFT. Recently we have introduced two embedding schemes to mitigate the statistical fluctuations in the electron density and resultant forces on the nuclei. Both techniques were based on fragmenting the system either in real-space or slicing the occupied space into energy windows, allowing for a significant reduction of the statistical fluctuations. For chemical accuracy further reduction of the noise is required, which could be achieved by increasing the number of stochastic orbitals. However, the convergence is relatively slow as the statistical error scales as $1/\sqrt{N_χ}$ according to the central limit theorem, where $N_χ$ is the number of random orbitals. In this paper we combined the aforementioned embedding schemes and introduced a new approach that builds on overlapped fragments and energy windows. The new approach significantly lowers the noise for ground state properties such as the electron density, total energy, and forces on the nuclei, as demonstrated for a G-center in bulk silicon.
description: The following article has been submitted to the Journal of Chemical Physics
One-step direct measurement of the entangled W states with cross-Kerr nonlinearity
Creators: name: Lin, Si-Le
name: Zhang, Chun-Lin
name: Hao, Si-Yang
name: Hong, Pei-Yao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a scheme to directly measure the entangled W states with cross-Kerr nonlinearity mediums. This scheme can measure three-photon, four-photon, and even N-photon W states in one step. Only PBSs and cross-Kerr nonlinearity mediums are used in this scheme, which is feasible for experiments. We describe the three-photon W states measurement process and extend it to four-photon and N-photon W states.
description: 8 pages, 3 figures
Dirac Equation and Quantum Relativistic Effects in a Single Trapped Ion
Creators: name: Lamata, L.
name: Leon, J.
name: Schaetz, T.
name: Solano, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a method of simulating the Dirac equation in 3+1 dimensions for a free spin-1/2 particle in a single trapped ion. The Dirac bispinor is represented by four ionic internal states, and position and momentum of the Dirac particle are associated with the respective ionic variables. We show also how to simulate the simplified 1+1 case, requiring the manipulation of only two internal levels and one motional degree of freedom. Moreover, we study relevant quantum-relativistic effects, like the Zitterbewegung and Klein's paradox, the transition from massless to massive fermions, with the relativistic and nonrelativistic limits, via the tuning of controllable experimental parameters.
description: 4 pages and 1 figure, minor corrections, accepted for publication in Physical Review Letters
Attractive and repulsive dipolar interaction in bilayers of indirect excitons
Creators: name: Choksy, Darius
name: Xu, Chao
name: Fogler, Michael
name: Butov, Leonid
name: Norman, Justin
name: Gossard, Arthur
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We explore attractive dipolar interaction in indirect excitons (IXs). For one layer of IXs in a single pair of coupled quantum wells (CQW), the out-of-plane IX electric dipoles lead to repulsive dipolar interaction between IXs. The attractive dipolar interaction between IXs is realized in a 2-CQW heterostructure with two IX layers in two separated CQW pairs. We found both in experimental measurements and theoretical simulations that increasing density of IXs in one layer causes a monotonic energy reduction for IXs in the other layer. We also found an in-plane shift of a cloud of IXs in one layer towards a cloud of IXs in the other layer. This behaviour is qualitatively consistent with attractive dipolar interaction. The measured IX energy reduction and IX cloud shift are higher than the values given by the correlated liquid theory.
Logarithmic Moduli Spaces for Surfaces of Class VII
Creators: name: Oeljeklaus, Karl
name: Toma, Matei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 32J15, 32G13, 14D22

description: In this paper we describe logarithmic moduli spaces of pairs (S,D) consisting of minimal surfaces S of class VII with positive second Betti number b_2 together with reduced divisors D of b_2 rational curves. The special case of Enoki surfaces has already been considered by Dloussky and Kohler. We use normal forms for the action of the fundamental group of the complement of D and for the associated holomorphic contraction germ from (C^2,0) to (C^2,0).
description: Minor correction of the dimension of the moduli space
Spectra of weighted algebras of holomorphic functions
Creators: name: Carando, Daniel
name: Sevilla-Peris, Pablo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Functional Analysis (math.FA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 46G25, 46A45

description: We consider weighted algebras of holomorphic functions on a Banach space. We determine conditions on a family of weights that assure that the corresponding weighted space is an algebra or has polynomial Schauder decompositions. We study the spectra of weighted algebras and endow them with an analytic structure. We also deal with composition operators and algebra homomorphisms, in particular to investigate how their induced mappings act on the analytic structure of the spectrum. Moreover, a Banach-Stone type question is addressed.
description: 25 pages Corrected typos
Bohm potential for the time dependent harmonic oscillator
Creators: name: Soto-Eguibar, Francisco
name: Asenjo, Felipe A.
name: Hojman, Sergio A.
name: Moya-Cessa, Héctor M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In the Madelung-Bohm approach to quantum mechanics, we consider a (time dependent) phase that depends quadratically on position and show that it leads to a Bohm potential that corresponds to a time dependent harmonic oscillator, provided the time dependent term in the phase obeys an Ermakov equation.
A Catalog and Atlas of Cataclysmic Variables: The Final Edition
Creators: name: Downes, Ronald A.
name: Webbink, Ronald F.
name: Shara, Michael M.
name: Ritter, Hans
name: Kolb, Ulrich
name: Duerbeck, Hilmar W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Catalog and Atlas of Cataclysmic Variables has been a staple of the CV community for over 10 years. The catalog has grown from 751 CVs in 1993 to 1600 CVs at present. The catalog became a ``living'' edition in 2001, and its contents have been continually updated since that time. Effective 27 January 2006, the catalog will transition to an archival site, with no further updates to its contents. While it is antipicated that the site will remain active, we present the complete contents of the site as a precaution against a loss of the on-line data.
description: 8 pages, including 6 tables
Metal enrichment of the intra-cluster medium over a Hubble time for merging and relaxed galaxy clusters
Creators: name: Kapferer, W.
name: Kronberger, T.
name: Weratschnig, J.
name: Schindler, S.
name: Domainko, W.
name: van Kampen, E.
name: Kimeswenger, S.
name: Mair, M.
name: Ruffert, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the efficiency of galactic mass loss, triggered by ram-pressure stripping and galactic winds of cluster galaxies, on the chemical enrichment of the intra-cluster medium (ICM). We combine N-body and hydrodynamic simulations with a semi-numerical galaxy formation model. By including simultaneously different enrichment processes, namely ram-pressure stripping and galactic winds, in galaxy-cluster simulations, we are able to reproduce the observed metal distribution in the ICM. We find that the mass loss by galactic winds in the redshift regime z>2 is ~10% to 20% of the total galactic wind mass loss, whereas the mass loss by ram-pressure stripping in the same epoch is up to 5% of the total ram-pressure stripping mass loss over the whole simulation time. In the cluster formation epochs z<2 ram-pressure stripping becomes more dominant than galactic winds. We discuss the non-correlation between the evolution of the mean metallicity of galaxy clusters and the galactic mass losses. For comparison with observations we present two dimensional maps of the ICM quantities and radial metallicity profiles. The shape of the observed profiles is well reproduced by the simulations in the case of merging systems. In the case of cool-core clusters the slope of the observed profiles are reproduced by the simulation at radii below ~300 kpc, whereas at larger radii the observed profiles are shallower. We confirm the inhomogeneous metal distribution in the ICM found in observations. To study the robustness of our results, we investigate two different descriptions for the enrichment process interaction.
description: 11 pages, 13 figures, accepted for publication in A&A, high resolution version can be found at
title: Redirection of Current in a Dense Plasma Focus
Creators: name: Gonzalez, Rocky
Publisher: name: University of Nevada, Las Vegas
publisherIdentifier: https://ror.org/0406gha72
publisherIdentifierScheme: ROR
Year: 2024

description: The Mission Support & Test Services (MSTS) reports that significant amounts of energy needed for generating high energy neutrons is lost within a Dense Plasma Focus between its pinch-end of the anode stalk and at its base near the insulating sleeve. It is their mission and the goal of this research effort to both experimentally and theoretically study current redirection in a DPF during and after pinch dynamics. It is hypothesized that current redirection, due to restrike, behind the dynamic sheath of a dense plasma focus will result in a measurable change in the magnetic field along the longitudinal axis of a DPF. It is further hypothesized that a linear monopole antenna will be able to measure the loss current and determine the location of redirection. Theory and software will be utilized to demonstrate the expected current distribution within a dense plasma focus and then be compared to experimental data measured by the linear monopole antenna.
Dynamically important magnetic fields near the event horizon of Sgr A*
Creators: name: GRAVITY Collaboration
name: Jiménez-Rosales, A.
name: Dexter, J.
name: Widmann, F.
name: Bauböck, M.
name: Abuter, R.
name: Amorim, A.
name: Berger, J. P.
name: Bonnet, H.
name: Brandner, W.
name: Clénet, Y.
name: de Zeeuw, P. T.
name: Eckart, A.
name: Eisenhauer, F.
name: Schreiber, N. M. Förster
name: Garcia, P.
name: Gao, F.
name: Gendron, E.
name: Genzel, R.
name: Gillessen, S.
name: Habibi, M.
name: Haubois, X.
name: Heissel, G.
name: Henning, T.
name: Hippler, S.
name: Horrobin, M.
name: Jochum, L.
name: Jocou, L.
name: Kaufer, A.
name: Kervella, P.
name: Lacour, S.
name: Lapeyrère, V.
name: Bouquin, J. -B. Le
name: Léna, P.
name: Nowak, M.
name: Ott, T.
name: Paumard, T.
name: Perraut, K.
name: Perrin, G.
name: Pfuhl, O.
name: Rodríguez-Coira, G.
name: Shangguan, J.
name: Scheithauer, S.
name: Stadler, J.
name: Straub, O.
name: Straubmeier, C.
name: Sturm, E.
name: Tacconi, L. J.
name: Vincent, F.
name: von Fellenberg, S.
name: Waisberg, I.
name: Wieprecht, E.
name: Wiezorrek, E.
name: Woillez, J.
name: Yazici, S.
name: Zins, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study the time-variable linear polarisation of Sgr A* during a bright NIR flare observed with the GRAVITY instrument on July 28, 2018. Motivated by the time evolution of both the observed astrometric and polarimetric signatures, we interpret the data in terms of the polarised emission of a compact region ('hotspot') orbiting a black hole in a fixed, background magnetic field geometry. We calculated a grid of general relativistic ray-tracing models, created mock observations by simulating the instrumental response, and compared predicted polarimetric quantities directly to the measurements. We take into account an improved instrument calibration that now includes the instrument's response as a function of time, and we explore a variety of idealised magnetic field configurations. We find that the linear polarisation angle rotates during the flare, which is consistent with previous results. The hotspot model can explain the observed evolution of the linear polarisation. In order to match the astrometric period of this flare, the near horizon magnetic field is required to have a significant poloidal component, which is associated with strong and dynamically important fields. The observed linear polarisation fraction of $\simeq 30\%$ is smaller than the one predicted by our model ($\simeq 50\%$). The emission is likely beam depolarised, indicating that the flaring emission region resolves the magnetic field structure close to the black hole.
description: 13 pages, 14 figures, to be published in A&A
Collective excitations and instability of an optical lattice due to unbalanced pumping
Creators: name: Asboth, J. K.
name: Ritsch, H.
name: Domokos, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We solve self-consistently the coupled equations of motion for trapped particles and the field of a one-dimensional optical lattice. Optomechanical coupling creates long-range interaction between the particles, whose nature depends crucially on the relative power of the pump beams. For asymmetric pumping, traveling density wave-like collective oscillations arise in the lattice, even in the overdamped limit. Increasing the lattice size or pump asymmetry these waves can destabilize the lattice.
description: 5 pages, minor changes (SI units, new references)
A Framework for Addressing the Risks and Opportunities In AI-Supported Virtual Health Coaches
Creators: name: Baee, Sonia
name: Rucker, Mark
name: Baglione, Anna
name: Ameko, Mawulolo K.
name: Barnes, Laura
Publisher: name: arXiv
Year: 2020
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Virtual coaching has rapidly evolved into a foundational component of modern clinical practice. At a time when healthcare professionals are in short supply and the demand for low-cost treatments is ever-increasing, virtual health coaches (VHCs) offer intervention-on-demand for those limited by finances or geographic access to care. More recently, AI-powered virtual coaches have become a viable complement to human coaches. However, the push for AI-powered coaching systems raises several important issues for researchers, designers, clinicians, and patients. In this paper, we present a novel framework to guide the design and development of virtual coaching systems. This framework augments a traditional data science pipeline with four key guiding goals: reliability, fairness, engagement, and ethics.
description: 4 pages
Two-Mode Squeezed States and Entangled States of Two Mechanical Resonators
Creators: name: Xue, Fei
name: Liu, Yu-xi
name: Sun, C. P.
name: Nori, Franco
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a device consisting of a dc-SQUID with two sections of its loop acting as two mechanical resonators. An analog of the parametric down-conversion process in quantum optics can be realized with this device. We show that a two-mode squeezed state can be generated for two overdamped mechanical resonators, where the damping constants of the two mechanical resonators are larger than the coupling strengths between the dc-SQUID and the two mechanical resonators. Thus we show that entangled states of these two mechanical resonators can be generated.
description: 9 pages, 3 figures
Ciencia Abierta: Introducción a la Gestión de Datos Abiertos en Investigación
Creators: name: Cortés, Rodrigo
Publisher: name: Zenodo
Year: 2024

description: Gestión de datos de investigación en Abierto

Este proceso activo de manejo de los datos generados en una investigación, se realiza de forma continua y cubre todas las decisiones relacionadas con la gestión de los datos a lo largo de su ciclo vital (CEPAL 2020).

En Ciencia Abierta no todos los datos de investigación deben ser abiertos en todas las circunstancias. Los datos pueden ser FAIR y compartidos bajo restricciones con licencias de uso. La máxima ‘Tan abierto como sea posible, tan cerrado como sea necesario' debe ser aplicado proporcionalmente con los mejores esfuerzos para compartir los datos.

 

En Chile Si su investigación es financiada con recursos públicos deberá cumplir con la política de Acceso Abierto a la información científica y datos de investigación de la agencia nacional de investigación y desarrollo (ANID).
Ultrasensitive Field-Effect Biosensors Enabled by the Unique Electronic Properties of Graphene
Creators: name: Zhang, Xiaoyan
name: Jing, Qiushi
name: Ao, Shen
name: Schneider, Grégory F.
name: Kireev, Dmitry
name: Zhang, Zhengjun
name: Fu, Wangyang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: This review provides a critical overview of current developments on nanoelectronic biochemical sensors based on graphene. Composed of a single layer of conjugated carbon atoms, graphene has outstanding high carrier mobility and low intrinsic electrical noise, but a chemically inert surface. Surface functionalization is therefore crucial to unravel graphene sensitivity and selectivity for the detection of targeted analytes. To achieve optimal performance of graphene transistors for biochemical sensing, the tuning of the graphene surface properties via surface functionalization and passivation is highlighted, as well as the tuning of its electrical operation by utilizing multifrequency ambipolar configuration and a high frequency measurement scheme to overcome the Debye screening to achieve low noise and highly sensitive detection. Potential applications and prospectives of ultrasensitive graphene electronic biochemical sensors ranging from environmental monitoring and food safety, healthcare and medical diagnosis, to life science research, are presented as well.
description: 24 pages, 9 figures
Mirage Pattern from the Heterotic String
Creators: name: Lowen, Valeri
name: Nilles, Hans Peter
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We provide a simple example of dilaton stabilization in the framework of heterotic string theory. It requires a gaugino condensate and an up-lifting sector similar to the one postulated in type IIB string theory. Its signature is a hybrid mediation of supersymmetry breakdown with a variant of a mirage pattern for the soft breaking terms. The set-up is suited for the discussion of heterotic MSSM candidates.
description: 25 pages, 9 figures
The geometrical form for the string space-time action
Creators: name: Popović, D. S.
name: Sazdović, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the present article, we derive the space-time action of the bosonic string in terms of geometrical quantities. First, we study the space-time geometry felt by probe bosonic string moving in antisymmetric and dilaton background fields. We show that the presence of the antisymmetric field leads to the space-time torsion, and the presence of the dilaton field leads to the space-time nonmetricity. Using these results we obtain the integration measure for space-time with stringy nonmetricity, requiring its preservation under parallel transport. We derive the Lagrangian depending on stringy curvature, torsion and nonmetricity.
description: 13 pages
Facile and Ultraclean Graphene-on-Glass Nanopores by Controlled Electrochemical Etching
Creators: name: Zhang, Xiaoyan
name: van Deursen, Pauline M. G.
name: Fu, Wangyang
name: Schneider, Gregory F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A wide range of approaches have been explored to meet the challenges of graphene nanostructure fabrication, all requiring complex and high-end nanofabrication platform and suffering from surface contaminations, potentially giving electrical noise and increasing the thickness of the atomically thin graphene membrane. Here, with the use of an electrical pulse on a low capacitance graphene-on-glass (GOG) membrane, we fabricated clean graphene nanopores on commercially available glass substrates with exceptionally low electrical noise. In situ liquid AFM studies and electrochemical measurements revealed that both graphene nanopore nucleation and growth stem from the electrochemical attack on carbon atoms at defect sites, ensuring the creation of a graphene nanopore. Strikingly, compared to conventional TEM drilled graphene nanopores on SiN supporting membranes, GOG nanopores featured an order-of-magnitude reduced broadband noise, which we ascribed to the electrochemical refreshing of graphene nanopore on mechanically stable glass chips with negligible parasitic capacitance (1 pF). Further experiments on double-stranded DNA translocations demonstrated a greatly reduced current noise, and also confirmed the activation of single nanopores. Therefore, the exceptionally low noise and ease of fabrication will facilitate the understanding of the fundamental property and the application of such atomically thin nanopore sensors.
description: 9 pages, 5 figures
ผลของสารสกัดจากรากมะก่องข้าว และรากขี้อ้นต่อไขมันในซีรั่มของหนูตัดรังไข่
Creators: name: คณพัชญ์ ปินาถา
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2558
Subjects: มะก่องข้าว, ขี้อ้น, ซีรั่มไขมัน, หนูตัดรังไข่

description: 4, 34, วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยมหาสารคาม
URBANİZASİYA VƏ EKOLOJİ PROBLEMLƏRİN QARŞILIQLI TƏSİRİ HAQQINDA
Creators: name: Qəhrəmanov Murad Aki̇f Oğlu
name: Mustafabəyli̇ Hüseyn Lütvəli̇ Oğlu
Publisher: name: In The World Of Science and Education
Year: 2025
Subjects: əhali artımı
urbanizasiya
ekologiya
antropogen təsir
landşaft
yaşıl enerji.

description: Urbanizasiya, yəni şəhərlərin böyüməsi və kənddən şəhərə köçlərin artması, son əsrlərdə insanların həyat tərzində mühüm dəyişikliklərə səbəb olmuşdur. Bu proses iqtisadi və sosial baxımdan bir çox üstünlüklər təqdim etsə də, ekologiyaya ciddi təsirləri vardır. 1. Torpaq və yaşıllıq itkisi – Urbanizasiya zamanı geniş sahələrdə meşələr qırılır, təbii ərazilər tikinti üçün istifadə edilir. Bu proses biomüxtəlifliyi azaldır və ətraf mühitdə balansı pozur. 2. Hava çirkliliyi – Şəhərlərdə nəqliyyat vasitələrinin sayı artdıqca və sənaye müəssisələri inkişaf etdikcə havanın keyfiyyəti pisləşir. Karbon dioksid (CO2), azot oksidləri (NOx) və digər zərərli qazların atmosferə atılması istixana effektinə və qlobal istiləşməyə səbəb olur. 3. Su resurslarının çirklənməsi – Urbanizasiya nəticəsində yaranan tullantılar və çirkab suları çaylara və göllərə axır, bu da suyun keyfiyyətinə mənfi təsir göstərir. Su hövzələrindəki çirklənmə isə su canlılarının həyatda qalmasını çətinləşdirir. 4. İqlim dəyişikliyi – Urbanizasiya iqlim dəyişikliyinin əsas səbəblərindən biridir. Şəhərlərdə "istilik adası" effekti yaranır; beton və asfalt örtüklər günəş enerjisini udaraq temperaturun yüksəlməsinə səbəb olur. Urbanizasiya qaçınılmaz bir prosesdir, lakin onun ekologiyaya təsirlərini minimuma endirmək mümkündür. İnsanlar, hökumətlər və müəssisələr birgə fəaliyyət göstərərək daha yaşıl və dayanıqlı şəhərlər yarada bilərlər. Bu, yalnız indiki deyil, gələcək nəsillər üçün də daha sağlam bir dünya təmin edəcəkdir.