cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Coherence Window in the dynamics of Quantum Nanomagnets
Creators: name: Stamp, P. C. E.
name: Tupitsyn, I. S.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Decoherence in many solid-state systems is anomalously high, frustrating efforts to make solid-state qubits. We show that in nanomagnetic insulators in large transverse fields, there can be a fairly narrow field region in which both phonon and nuclear spin-mediated decoherence are drastically reduced. As examples we calculate decoherence rates for the $Fe$-8 nanomolecule, for $Ni$ particles, and for $Ho$ ions in $LiHo_xY_{1-z}F_4$. The reduction in the decoherence, compared to low field rates, can exceed 6 orders of magnitude. The results also give limitations on the observability of macroscopic coherence effects in magnetic systems.
description: 5 LaTeX pages, 3 figures
Quantum calculation of the low-energy effective action in $5D$, ${\cal N}=2$ SYM theory
Creators: name: Buchbinder, I. L.
name: Ivanov, E. A.
name: Merzlikin, B. S.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider $5D$, ${\cal N}=2$ supersymmetric Yang-Mills (SYM) theory in $5D$, ${\cal N}=1$ harmonic superspace as a theory of the interacting adjoint $5D$, ${\cal N}=1$ gauge multiplet and hypermultiplet. Using the background superfield method, we compute the leading low-energy contribution to the one-loop effective action. The result of quantum calculations precisely matches the effective action derived earlier in {\tt arXiv:1812.07206} on the pure symmetry grounds.
description: 1+10 pages
Reflections on the future of research, development and innovation in Colombia
Creators: name: MARTINIS, DOMENICO DE
Publisher: name: figshare
Year: 2020
Subjects: subject: Science Policy
subject: 160607 International Relations
subject: FOS: Political science

description: Colombia is going through a moment of historical change. After four years of formal peace negotiations and the signing of a peace agreement with the FARC in November 2016, the country is set to enter an era of increased stability. In this perspective, the Colombian government should concentrate its effort to respond to societal challenges by improving infrastructure, promoting social inclusion and a sustainable use of natural resources. However, while it is acknowledged that greater investments in science and technology could foster economic growth and development and respond to societal needs, Colombia is still lagging behind. Greater investment in science and technology with a long-term perspective should support the country’s efforts for growth and development. Furthermore, considering Colombia´s great diversity in terms of population, topography and societal needs, it appears reductive to apply a ‘one size fits all’ solution. This article presents some reflections on how strengthening the capacity of higher education institutions (HEIs) for research and internationalization and strengthening the link between knowledge, practice and policy would contribute to more and better research, development and innovation in Colombia.
A Polar de Rham Theorem
Creators: name: Khesin, B.
name: Rosly, A.
name: Thomas, R. P.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Algebraic Geometry (math.AG)
subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We prove an analogue of the de Rham theorem for polar homology; that the polar homology $HP_q(X)$ of a smooth projective variety $X$ is isomorphic to its $H^{n,n-q}$ Dolbeault cohomology group. This analogue can be regarded as a geometric complexification where arbitrary (sub)manifolds are replaced by complex (sub)manifolds and de Rham's operator $d$ is replaced by Dolbeault's $\bar\partial$.
description: Referee's corrections. 17 pages, to appear in Topology
Alchemi: A .NET-based Grid Computing Framework and its Integration into Global Grids
Creators: name: Luther, Akshay
name: Buyya, Rajkumar
name: Ranjan, Rajiv
name: Venugopal, Srikumar
Publisher: name: arXiv
Year: 2004
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences
subject: C.2.4

description: Computational grids that couple geographically distributed resources are becoming the de-facto computing platform for solving large-scale problems in science, engineering, and commerce. Software to enable grid computing has been primarily written for Unix-class operating systems, thus severely limiting the ability to effectively utilize the computing resources of the vast majority of desktop computers i.e. those running variants of the Microsoft Windows operating system. Addressing Windows-based grid computing is particularly important from the software industry's viewpoint where interest in grids is emerging rapidly. Microsoft's .NET Framework has become near-ubiquitous for implementing commercial distributed systems for Windows-based platforms, positioning it as the ideal platform for grid computing in this context. In this paper we present Alchemi, a .NET-based grid computing framework that provides the runtime machinery and programming environment required to construct desktop grids and develop grid applications. It allows flexible application composition by supporting an object-oriented grid application programming model in addition to a grid job model. Cross-platform support is provided via a web services interface and a flexible execution model supports dedicated and non-dedicated (voluntary) execution by grid nodes.
description: 17 pages, 12 figures, 2 tables
New correlations induced by nuclear supersymmetry
Creators: name: Barea, J.
name: Bijker, R.
name: Frank, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We show that the nuclear supersymmetry model (n-susy) in its extended version, predicts correlations in the nuclear structure matrix elements which characterize transfer reactions between nuclei that belong to the same supermultiplet. These correlations are related to the fermionic generators of the superalgebra and if verified experimentally can provide a direct test of the model.
description: Invited talk at "Nuclear Physics: Large and Small", April 19-22, 2004, Hacienda Cocoyoc, Mexico
Generalized ghost-free propagators in nonlocal field theories
Creators: name: Buoninfante, Luca
name: Lambiase, Gaetano
name: Miyashita, Yuichi
name: Takebe, Wataru
name: Yamaguchi, Masahide
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: In this paper we present an iterative method to generate an infinite class of new nonlocal field theories whose propagators are ghost-free. We first examine the scalar field case and show that the pole structure of such generalized propagators possesses the standard two derivative pole and in addition can contain complex conjugate poles which, however, do not spoil at least tree level unitarity as the optical theorem is still satisfied. Subsequently, we define analogous propagators for the fermionic sector which is also devoid of unhealthy degrees of freedom. As a third case, we apply the same construction to gravity and define a new set of theories whose graviton propagators around the Minkowski background are ghost-free. Such a wider class also includes nonlocal theories previously studied, and Einstein's general relativity as a peculiar limit. Moreover, we compute the linearized gravitational potential generated by a static point-like source for several gravitational theories belonging to this new class and show that the nonlocal nature of gravity regularizes the singularity at the origin.
description: 12 pages, 1 figure
Nondiffracting Optical Beams: physical properties, experiments and applications
Creators: name: Bouchal, Zdenek
Publisher: name: arXiv
Year: 2003
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The controversial term "nondiffracting beam" was introduced into optics by Durnin in 1987. Discussions related to that term revived interest in problems of the light diffraction and resulted in an appearance of the new research direction of the classical optics dealing with the localized transfer of electromagnetic energy. In the paper, the physical concept of the nondiffracting propagation is presented and the basic properties of the nondiffracting beams are reviewed. Attention is also focused to the experimental realization and to applications of the nondiffracting beams.
description: 24 pages, 22 figures
Edge-critical subgraphs of Schrijver graphs
Creators: name: Kaiser, Tomáš
name: Stehlík, Matěj
Publisher: name: arXiv
Year: 2019
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C15

description: For $k\geq 1$ and $n\geq 2k$, the Kneser graph $KG(n,k)$ has all $k$-element subsets of an $n$-element set as vertices; two such subsets are adjacent if they are disjoint. It was first proved by Lovász that the chromatic number of $KG(n,k)$ is $n-2k+2$. Schrijver constructed a vertex-critical subgraph $SG(n,k)$ of $KG(n,k)$ with the same chromatic number. For the stronger notion of criticality defined in terms of removing edges, however, no analogous construction is known except in trivial cases. We provide such a construction for $k=2$ and arbitrary $n\geq 4$ by means of a nice explicit combinatorial definition.
Universal Spin-Flip Transition in Itinerant Antiferromagnets
Creators: name: Varelogiannis, Georgios
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report a universal spin flip (SF) transition as a function of temperature in spin-density-wave (SDW) systems. At low temperatures the antiferromagnetic (AFM) polarization is parallel to the applied field and above a critical temperature the AFM polarization {\it flips} perpendicular to the field. This transition occurs in {\it any} SDW system and may be considered as a qualitative probe of the itinerant character of AFM in a given material. Our SF transition resolves the longstanding puzzle of the SF transition observed in cromium and may be at the origin of the equally puzzling SDW-I to SDW-II transition in Bechgaard salts for which we make experimental predictions.
Intelligent system to improve the sustainability of oil palm crops through the construction of forecasting maps
Creators: name: Pena, Alejandro
name: Gongora, Mario
name: Bonet, Isis
name: Caraffini, Fabio
Publisher: name: De Montfort University
Year: 2020
Subjects: subject: 99901 Agricultural Engineering
subject: FOS: Other engineering and technologies
subject: Applied Computer Science
subject: Artificial Intelligence and Image Processing
subject: FOS: Computer and information sciences

description: The Oil Palm is considered by de Colombian Government as one of the main agricultural products to promote the substitution of illegal crops and for job creation in the countryside for a sustainable peace process evolution. To improve the sustainability of this crop, the RSPO (Roundtable on Sustainable Palm Oil) has established principles to reduce the use of pesticides, fertilizers and fires, as well as fair treatment of land and workers according to local and international labour rights. This project aims to develop an intelligent system to improve the sustainability of this crop in Colombia, using novel adaptive vegetation indices obtained from multispectral aerial views. This will be integrated into a forecasting map using Computational Intelligence concepts, to achieve international standards that support the development of oil palm crops in Colombia, both at small and medium scale. Further to this, an additional goal of the agreement between universities and industry is the creation of a novel service to improve the sustainability of oil palm crops in a study zone based in information systems and technologies in precision agriculture, which can further be extended to improve the sustainability of this crop in other places where it is grown as an alternative to existing crops. The role of the partners neatly complements each other. In this way, the industry partner, Unipalma of the Llanos will validate the model in a real environment. The Institute of Artificial Intelligence (IAI) located in De Montfort University, is the academic partner that provides advice regarding the implementation of the Intelligent System as a service. EIA University will execute the field research activities related to image capture and processing, the implementation and validation of the intelligence system in a simulated and real environment.
Chemical enrichment and host galaxies of extremely-strong intervening DLAs towards quasars
Creators: name: Ranjan, A.
name: Noterdaeme, P.
name: Krogager, J. -K.
name: Petitjean, P.
name: Srianand, R.
name: Balashev, S. A.
name: Gupta, N.
name: Ledoux, C.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the results from VLT/X-shooter spectroscopic observations of 11 extremely strong intervening damped Lyman-alpha absorbers (ESDLAs) initially selected as high N(Hi) (i.e.>=5x10^21 cm-2) candidates from the Sloan Digital Sky Survey (SDSS). We confirm the high Hi column densities which we measure to be in the range log N(Hi) = 21.6-22.4. Molecular hydrogen is detected with high column densities (N(H_2)>=10^18 cm-2) in five out of eleven systems, three of which are reported here for the first time. We compare the chemical properties of this sample of ESDLAs, supplemented with literature measurements, to that of DLAs located at the redshift of long-duration gamma-ray bursts (GRB-DLAs). We confirm that the two populations are almost indistinguishable in terms of chemical enrichment, H_2 column density and gas kinematics. All this suggests that ESDLAs and GRB-DLAs probe similar galactic environments. We search for the galaxy counterparts of ESDLAs and find associated emission lines in three out of eleven systems, two of which are reported here for the first time (towards the quasars SDSS J002503.03+114547.80 and SDSS J114347.21+142021.60, respectively). The measured separations between the quasar sightlines and the emission associated with the ESDLA galaxy are all very small (rho < 3 kpc). While the small impact parameters are similar to what is observed for GRB-DLAs, the associated star-formation rates are on average lower than seen for GRB host galaxies. This is explained by long-duration GRBs being associated with the death of massive stars, hence pinpointing regions of active star formation in the GRB host galaxies. Our observations support the suggestion from the literature that ESDLAs could act as blind analogues of GRB-DLAs, probing high column density neutral gas in the heart of high-redshift galaxies, without any prior on the instantaneous star-formation rate.
description: 13 page paper with 8 additional appendix pages, 10 main figures with 23 figures in appendix
Semiclassical Asymptotics for the Maxwell - Dirac System
Creators: name: Sparber, C.
name: Markowich, P.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 81Q20, 35B25, 35B40, 35L60

description: We study the coupled system of Maxwell and Dirac equations from a semiclassical point of view. A rigorous nonlinear WKB-analysis, locally in time, for solutions of (critical) order $O(\sqrtε)$ is performed, where the small semiclassical parameter $ε$ denotes the microscopic/macroscopic scale ratio.
Additional file 2 of First-year nursing students’ initial contact with the clinical learning environment: impacts on their empathy levels and perceptions of professional identity
Creators: name: Wang, Qinghua
name: Cao, Xiaohong
name: Du, Tianjiao
Publisher: name: figshare
Year: 2022
Subjects: Medicine
Biological Sciences not elsewhere classified
Developmental Biology
Science Policy

description: Additional file 2. Contents of the clinical placement.
Additive Manufacturing in Aerospace and Defense Industries: A Review
Creators: name: A. K. Madan
name: Kanishk Yadav
name: Harshit Jain
name: Himanshu Bhatt
name: Himanshu Bist
Publisher: name: figshare
Year: 2021
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering

description: Additive Manufacturing (AM) is a promising fabrication technique that can offer significant benefits to aerospace industries and Defense Support Service providers. Because of its potential to delocalize production near the point of use and its transformative potential, the technology is gaining popularity. In fact, AM has a great potential to revolutionise the global manufacturing and distribution system by offering low cost and highly customized parts. AM encompasses a broad variety of techniques for converting a 3D file into a physical product by depositing layer upon layer of content. AM is only in its early stages of growth and is considered a young technology. Because of this immaturity, there is a lot of confusion around key metrics like time and cost. Moreover many studies have been going on to make AM more versatile and reliable technology with a focus on developing novel materials , process optimisation and cost efficiency. There are also important decision variables when evaluating AM and comparing them to conventional manufacturing processes such as cost of production , reliability, repeatability optimisation and material properties. This study paper seeks to bring to the reader the different AM techniques with a detailed emphasis on the most relevant innovations to Aerospace and Defence Support Services. Among the various sectors, Aerospace has given the most importance to AM technologies by providing heavy investment for developing the AM industrial applications.This paper aims to introduce recent research and developments in the Defence and Aerospace industry with possible improvements in AM technologies and cost modelling strategies for production of highly customized products.
Electrical transport properties of bulk tetragonal CuMnAs
Creators: name: Volny, J
name: Wagenknecht, D.
name: Zelezny, J
name: Harcuba, P
name: Duverger-Nedellec, E
name: Colman, R H
name: Kudrnovsky, J
name: Turek, I
name: Uhlirova, K
name: Vyborny, K
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Temperature-dependent resistivity and magnetoresistance are measured in bulk tetragonal phase of antiferromagnetic CuMnAs and the latter is found to be anisotropic both due to structure and magnetic order. We compare these findings to model calculations with chemical disorder and finite-temperature phenomena included. The finite-temperature ab initio calculations are based on the alloy analogy model implemented within the coherent potential approximation and the results are in fair agreement with experimental data. Regarding the anisotropic magnetoresistance (AMR) which reaches a modest magnitude of 0.12%, we phenomenologically employ the Stoner-Wohlfarth model to identify temperature-dependent magnetic anisotropy of our samples and conclude that the field-dependence of AMR is more similar to that of antiferromagnets than ferromagnets, suggesting that the origin of AMR is not related to isolated Mn magnetic moments.
description: 10+ pages, few minor issues corrected
3D fluid modeling of positive streamer discharges in air with stochastic photoionization
Creators: name: Marskar, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Streamer discharges are thin plasma channels that precede lightning and sparks. They usually evolve in bundles as stochastic tree-like structures and are inherently difficult to model due to their multiscale nature. In this paper, we perform a computer investigation of positive streamer discharges in air using contemporary photoionization models. We report on three-dimensional computer simulations under conditions that are available in laboratory spark-gap experiments. The solutions demonstrate a multiscale morphology consisting of streamer fluctuations, branching, and the formation of a discharge tree. Some branches are comparatively thick and noisy, while others are thin, smooth, and carry electric fields exceeding $250\,\textrm{kV/cm}$ at their tips. Our results are consistent with past experiments and clarify the puzzling branching dynamics and stochastic morphology of positive streamer discharges.
description: 14 pages, 3 figures, 2 movies
Study on the formation of MgB2 phase
Creators: name: Feng, Qing-rong
name: Chen, Chinping
name: Xu, Jun
name: Kong, Ling-wen
name: Chen, Xiu
name: Wang, Yong-zhong
name: Gao, Zheng-xiang
Publisher: name: arXiv
Year: 2003
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: We report the study of the polycrystalline MgB2 phase formation during the fabrication processes. Three major phases are identified in different sintering temperature ranges according to the corresponding superconducting properties and the crystalization conditions. The optimum fabrication parameters are obtained for the MgB2 superconducting phase formation.
description: 10 pages, figures included
Cosmology from Rolling Massive Scalar Field on the anti-D3 Brane of de Sitter Vacua
Creators: name: Garousi, Mohammad R.
name: Sami, M.
name: Tsujikawa, Shinji
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate a string-inspired scenario associated with a rolling massive scalar field on D-branes and discuss its cosmological implications. In particular, we discuss cosmological evolution of the massive scalar field on the ant-D3 brane of KKLT vacua. Unlike the case of tachyon field, because of the warp factor of the anti-D3 brane, it is possible to obtain the required level of amplitude of density perturbations. We study the spectra of scalar and tensor perturbations generated during the rolling scalar inflation and show that our scenario satisfies the observational constraint coming from the Cosmic Microwave Background anisotropies and other observational data. We also implement the negative cosmological constant arising from the stabilization of the modulus fields in the KKLT vacua and find that this leads to a successful reheating in which the energy density of the scalar field effectively scales as a pressureless dust. The present dark energy can be also explained in our scenario provided that the potential energy of the massive rolling scalar does not exactly cancel with the amplitude of the negative cosmological constant at the potential minimum.
description: RevTex4, 15 pages, 5 eps figures, minor clarifications and few references added, final version to appear in PRD
Homogeneous Holographic Viscoelastic Models & Quasicrystals
Creators: name: Baggioli, Matteo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that the field theories dual to the homogeneous holographic models with spontaneously broken translations display several distinctive properties of quasicrystals, aperiodic crystals with long-range order (e.g. incommensurate charge density waves). This interpretation suggests that the longitudinal diffusive mode, observed in the spectrum of excitations of these systems, is the diffusive Goldstone boson typical of quasicrystals -- the phason. Moreover, following this idea, and using the effective field theory formalism for Goldstone modes in dissipative systems, we are able to derive the universal phase relaxation found in these holographic models in presence of a small source of explicit breaking (pseudo-spontaneous regime).
description: Matching the published version as a Rapid Communication in Physical Review Research
Additional file 1 of First-year nursing students’ initial contact with the clinical learning environment: impacts on their empathy levels and perceptions of professional identity
Creators: name: Wang, Qinghua
name: Cao, Xiaohong
name: Du, Tianjiao
Publisher: name: figshare
Year: 2022
Subjects: Medicine
Biological Sciences not elsewhere classified
Developmental Biology
Science Policy

description: Additional file 1. Introduction to Nursing.
Exploring the Intersectional Development of Computer Science Identities in Young Latinas.
Creators: name: Rawhiya Jacob, Sharin
name: Montoya, Jonathan
name: Warschauer, Mark
Publisher: name: Stanford Digital Repository
Year: 2025
Subjects: subject: Computer science
subject: computational thinking
subject: Identity (Psychology)
subject: Intersectionality (Sociology)
subject: Multilingual education
subject: English learner
subject: language learner

description: Abstract
Background: There has been a dearth of research on intersectional identities in STEM, including the fields of computing and engineering. In computing education research, much work has been done on broadening participation, but there has been little investigation into how the field of computer science (CS) presents opportunities for students with strong intersectional identities. This study explores the strengths and connections among the unique identities and the symbiotic relationships that elementary Latina students hold in CS identity attainment.
Purpose: The aim of this article is to better understand how predominantly low- income, multilingual Latina students experience identity development through the lens of diverse group membership. We examine how young Latinas, through their participation in a yearlong culturally and linguistically responsive CS curriculum, leverage their intersecting identities to rewrite the formula of what a computer scientist is and can be, leaving space to include and invite other strong identities as well.
Research Design: An explanatory sequential mixed-methods design was used that analyzed data from predominantly low-income, multilingual Latinas in upper elementary grades, including pre- and post-CS identity surveys (N = 50) delivered before and after implementation of the curriculum, and eight individual semi- structured student interviews.

Findings: We found that Latina students developed significantly stronger identification with the field of CS from the beginning to the end of the school year with regard to their experiences with CS, perception of themselves as computer scientists, family support for CS and school, and friend support for CS and school. Interviews revealed that perception of their CS ability greatly influenced identification with CS and that girls’ self-perceptions stemmed from their school, cultural, and home learning environments.

Conclusion: Our results highlight the wealth of resources that Latinas bring to the classroom through their home- and community-based assets, which are characterized by intersecting group membership. Students did not report on the intersection between language and CS identity development, which warrants further investigation.
La RSC y las refinerias del futuro
Creators: name: Flores, Ramiro
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 409999
subject: Other engineering not elsewhere classified

description: La Responsabilidad Social Corporativa (RSC), es un concepto que actualmente se encuentra inmerso entre los principales objetivos empresariales e institucionales. Por tanto, es imposible pensar en empresas orientadas únicamente a la generación de beneficios económicos, donde la creación de valor social ha adquirido un puesto expectante dentro de la creación de valor en las organizaciones.Al respecto, existen numerosos trabajos de análisis e investigación a nivel nacional e internacional sobre Desarrollo Sostenible. Sin embargo, no existen trabajos específicos que relacionen o expliquen científicamente, por qué los avances en esta materia son limitados y se continúa bajo el esquema sin medida de la explotación de los Recursos Naturales. Sin embargo, es importante identificar el impacto en países en vías de desarrollo, como es el caso boliviano, donde los nuevos desafíos y las oportunidades que podría ofrecer la RSC; como mecanismo creativo y dinamizador en las estrategias de las organizaciones, en especial de YPFB Corporación; puedan sustentar una visión de largo plazo, que involucre ganancias de libertad, flexibilidad y eficiencia, en las relaciones entre el Estado, el sector privado y la sociedad. En consecuencia, la propuesta pretende relacionar las diversas aportaciones científicas en torno al Desarrollo Sostenible y el Crecimiento Económico de nuestro país.
Investigating the recruitment of centrosomal proteins to the nuclear envelope during myogenesis
Creators: name: Shak, Caroline
Publisher: name: University of Leicester
Year: 2020
Subjects: Uncategorized

description: Several stages of nuclear movement and positioning occur during the differentiation of myoblasts into myotubes and myofibres, allowing nuclei to be spread along the cell length and periphery. In a developing myotube, the nuclear envelope (NE) spanning linker of nucleoskeleton to cytoskeleton (LINC) complex recruits centrosomal proteins such as PCM1, pericentrin and AKAP450 to form the nuclear microtubule organising centre (nMTOC). Microtubules nucleated from the nMTOC are used by motor proteins to position myonuclei, failure of which leads to myonuclear clustering and muscle disease. This study explored how the LINC complex component nesprin-1 acts as a centrosomal protein receptor, and how centrosomal proteins relocate to the NE. The muscle-specific isoform nesprin-1α2 recruited PCM1 and AKAP450 to the NE in nesprin-1 null myotubes, through its Nterminal region comprising a 31 residue isoform-specific sequence, 3 spectrin repeats and the adaptive domain. PCM1 residues 1-331 localised to the NE and interacted with nesprin-1α2. In contrast, residues 302-573 localised to the centriolar satellites, suggesting the mode of PCM1 binding, and potentially, function at the two sites is different. GFP nesprin 1α2 expression in non-myotube cells was not sufficient to recruit PCM1 or pericentrin to the NE. Yet, forced tethering of PCM1 residues 1-1089 to the NE appeared to be able to weakly recruit pericentrin to the NE. This suggests that upon myogenesis, myogenic events such as phosphorylation, mediate PCM1 transfer to the NE, where it readily functions as a scaffolding protein. In nesprin-1 null myotubes, NE tethered PCM1 appeared to recruit AKAP450 to the NE. However, depletion of PCM1 in myotubes only partially reduced the NE localisation of pericentrin, whereas AKAP450 was unaffected. This suggests that at the NE, PCM1 functions as part of a larger protein scaffold to recruit pericentrin and AKAP450 to the NE. This study starts to delineate nMTOC formation at the nesprin-1α2 interface.
The Star-Forming Interstellar Medium of Lyman Break Galaxy Analogs
Creators: name: Wu, John F.
name: Baker, Andrew J.
name: Heckman, Timothy M.
name: Hicks, Erin K. S.
name: Lutz, Dieter
name: Tacconi, Linda J.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present VLT/SINFONI near-infrared (NIR) integral field spectroscopy of six $z \sim 0.2$ Lyman break galaxy "analogs" (LBAs), from which we detect HI, HeI, and [FeII] recombination lines, and multiple H$_2$ ro-vibrational lines in emission. Pa$α$ kinematics reveal high velocity dispersions and low rotational velocities relative to random motions ($\langle v/σ\rangle = 1.2 \pm 0.8$). Matched-aperture comparisons of H$β$, H$α$, and Pa$α$ reveal that the nebular color excesses are lower relative to the continuum color excesses than is the case for typical local star-forming systems. We compare observed HeI/HI recombination line ratios to photoionization models to gauge the effective temperatures (T$_{\rm eff}$) of massive ionizing stars, finding the properties of at least one LBA are consistent with extra heating from an active galactic nucleus (AGN) and/or an overabundance of massive stars. We use H$_2$ 1-0 S($\cdot$) ro-vibrational spectra to determine rotational excitation temperature $T_{\rm ex} \sim 2000$ K for warm molecular gas, which we attribute to UV heating in dense photon-dominated regions. Spatially resolved NIR line ratios favor excitation by massive, young stars, rather than supernovae or AGN feedback. Our results suggest that the local analogs of Lyman break galaxies are primarily subject to strong feedback from recent star formation, with evidence for AGN and outflows in some cases.
description: Accepted for publication in ApJ; 30 pages, 9 figures
D7.1 – Interoperability with Scholarly Infrastructure Services
Creators: name: Czerniak, Andreas
name: Schirrwagen, Jochen
name: Bardi, Alessia
name: Manghi, Paolo
Publisher: name: Zenodo
Year: 2019

description: OpenAIRE and other scholarly communication infrastructure services mutually benefit from a
 fostered integration and utilization of their offered information. OpenAIRE collaborates with Jisc
 regarding SHERPA/RoMEO on the one hand and with DataCite regarding the ScholeExplorer on
 the other hand. These are two examples of efficient collaboration resulting in added value
 services and information enrichment.
 This report discusses and describes several use cases and integration scenarios for both services.
 In case of the SHERPA/RoMEO service information on copyright policies and self-archiving
 options will inform authors of scientific publications in OpenAIRE and enrich bibliographic
 metadata together with relevant information, like funders archiving mandates and license
 information on national and consortial level. These measures are aimed to support Open Access
 to scientific publications.
 The integration of the OpenAIRE ScholeXplorer service in DataCite ensures real-time updates of
 dataset to literature links which is of benefit to 3rd party services.
Critical Current Density and Resistivity of MgB2 Films
Creators: name: Rowell, J. M.
name: Xu, S. Y.
name: Zeng, X. H.
name: Pogrebnyakov, A. V.
name: Li, Q.
name: Xi, X. X.
name: Redwing, J. M.
name: Tian, W.
name: Pan, X.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The high resistivity of many bulk and film samples of MgB2 is most readily explained by the suggestion that only a fraction of the cross-sectional area of the samples is effectively carrying current. Hence the supercurrent (Jc) in such samples will be limited by the same area factor, arising for example from porosity or from insulating oxides present at the grain boundaries. We suggest that a correlation should exist, Jc ~ 1/{Rho(300K) - Rho(50K)}, where Rho(300K) - Rho(50K) is the change in the apparent resistivity from 300 K to 50 K. We report measurements of Rho(T) and Jc for a number of films made by hybrid physical-chemical vapor deposition which demonstrate this correlation, although the "reduced effective area" argument alone is not sufficient. We suggest that this argument can also apply to many polycrystalline bulk and wire samples of MgB2.
description: 11 pages, 3 figures
Conformal Fixed Points of Unidentified Gauge Theories
Creators: name: Polyakov, A. M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this article we discuss gauge/strings correspondence based on the non-critical strings. With this goal we present several remarkable sigma models with the AdS target spaces. The models have kappa symmetry and are completely integrable. The radius of the AdS space is fixed and thus they describe isolated fixed points of gauge theories in various dimensions
description: 14 pages
Cold Spray Additive Manufacturing of Ni Alloy 718 and High Entropy Alloy CoCrFeMoNi
Creators: name: Walker, Michael
Publisher: name: University of Leicester
Year: 2020
Subjects: Uncategorized

description: Cold spray is a technique where metallic powder is deposited in solid state athigh velocities using high pressure inert gas. High entropy alloys (HEAs) area type of alloy in which there are five or more constituents that are in approximatelyequal atomic proportions. HEAs have unique thermodynamic propertieswhich gives the alloys increased solid solution strengthening, high temperaturestability and fracture resistance. A HEA composition was selected based on thermodynamicanalysis of alloys reviewed in literature and those which containeddesirable properties for cold spray. Ni alloy 718 and the HEA were sprayed toachieve optimised coatings based on deposition efficiency, porosity and ductility.Microstructures were studied via microscopy, X-ray diffraction, and X-ray fluorescence.Indentation, residual stress, bending and tensile loading measurementsfacilitated the study of mechanical properties.Particle impacts revealed the ultrafine grain structure and high defect densityat the interface. Nano X-ray diffraction resulted in intense diffraction at theinterface, confirming the existence of sub 100nm crystallites. The addition oflaser assisted cold spray increased interfacial mixing and recrystallisation duringdeposition, however, the tensile residual stress was increased. 6mm thickNi alloy 718 deposits successfully without delamination. Heat treatments of thethick Ni alloy deposits resulted in increased UTS and ductility. The HEA powderconsisted of FCC and BCC structures. The small, rapidly cooling particlesavoid Mo segregation, resulting in BCC structures to accommodate strain. In theas-sprayed condition the FCC structure dominated over the BCC structure dueto microstructural changes during deposition and rebounding of BCC particles.Ageing of the HEA resulted in severe embrittlement and loss in strength becausedefect density was not reduced and hard precipitates formed. The annealing andannealing+ageing treatments increased strength but had little effect on ductility.
General Search for New Phenomena in ep Scattering at HERA
Creators: name: Wessels, Martin
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A model-independent search for deviations from the Standard Model prediction has been performed in e+p and e-p collisions at HERA using H1 data. All experimentally measurable event topologies involving isolated electrons, photons, muons, neutrinos and jets with high transverse momenta have been investigated. A good agreement with the Standard Model prediction is found in most of the event classes. A new algorithm has been developed to look for regions with large deviations from the Standard Model in the invariant mass and sum of transverse momenta distributions and to quantify the significance of the fluctuations observed. The largest deviation is found in topologies with an isolated muon, missing transverse momentum and a jet which confirms previous observations. About 2% of hypothetical Monte Carlo experiments would produce deviations more significant than the one observed in the corresponding distribution of sum of transverse momenta.
description: Oct 2003. 3pp. Talk given at International Europhysics Conference on High-Energy Physics (HEP 2003), Aachen, Germany, 17-23 Jul 2003, references updated
MPEC 2024-B47 : 2023 ST76
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 ST76

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Exchange Interaction Between Three and Four Coupled Quantum Dots: Theory and Applications to Quantum Computing
Creators: name: Mizel, Ari
name: Lidar, Daniel A.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Several prominent proposals have suggested that spins of localized electrons could serve as quantum computer qubits. The exchange interaction has been invoked as a means of implementing two qubit gates. In this paper, we analyze the strength and form of the exchange interaction under relevant conditions. We find that, when several spins are engaged in mutual interactions, the quantitative strengths or even qualitative forms of the interactions can change. It is shown that the changes can be dramatic within a Heitler-London model. Hund-Mulliken calculations are also presented, and support the qualititative conclusions from the Heitler-London model. The effects need to be considered in spin-based quantum computer designs, either as a source of gate error to be overcome or a new interaction to be exploited.
description: 16 pages, 16 figures. v3: Added Hund-Mulliken calculations in 3-dots case. A few small corrections. This version submitted to PRB
Unveiling Sizes of Compact AGN Hosts with ALMA
Creators: name: Chang, Yu-Yen
name: Floc'h, Emeric Le
name: Juneau, Stéphanie
name: da Cunha, Elisabete
name: Salvato, Mara
name: Dekel, Avishai
name: Civano, Francesca
name: Marchesi, Stefano
name: Suh, Hyewon
name: Wang, Wei-Hao
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present rest-frame far-infrared (FIR) and optical size measurements of AGN hosts and star-forming galaxies in the COSMOS field, enabled by high-resolution ALMA/1 mm (0.1 arcsec - 0.4 arcsec) and HST/F814W imaging (~ 0.1 arcsec). Our sample includes 27 galaxies at z<2.5, classified as infrared-selected AGN (3 sources), X-ray selected AGN (4 sources), and non-AGN star-forming galaxies (20 sources), for which high-resolution Band 6/7 ALMA images are available at 1 mm from our own observing program as well as archival observations. The sizes and SFR surface densities measured from both ALMA/1 mm and HST/F814W images show that obscured AGN host galaxies are more compact than non-AGN star-forming galaxies at similar redshift and stellar mass. This result suggests that the obscured accretion phase may be related to galaxies experiencing a compaction of their gaseous component, which could be associated with enhanced central star formation before a subsequent quenching driving the formation of compact passive galaxies. Moreover, most of the detected and stacked rest-frame FIR sizes of AGNs in our sample are similar or more compact than their rest-frame optical sizes, which is consistent with recent results of ALMA detected sources. This might be explained by the fact that the dusty starbursts take place in the compact regions, and suggests that the star formation mechanisms in the compact regions of AGN hosts are similar to those observed in star-forming galaxies observed with ALMA.
description: accepted for publication in ApJ
In praise of simple scatterplots
Creators: name: Cuffe, Paul
Publisher: name: figshare
Year: 2022
Subjects: subject: 120307 Visual Communication Design (incl. Graphic Design)
subject: FOS: Arts (arts, history of arts, performing arts, music)

description: Author's copy of this manuscript appearing in IEEE Potentials:

P. Cuffe, "In praise of simple scatterplots," in IEEE Potentials, vol. 40, no. 5, pp. 36-38, Sept.-Oct. 2021, doi: 10.1109/MPOT.2019.2891169.
Tracing the high energy theory of gravity: an introduction to Palatini inflation
Creators: name: Tenkanen, Tommi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present an introduction to cosmic inflation in the context of Palatini gravity, which is an interesting alternative to the usual metric theory of gravity. In the latter case only the metric $g_{μν}$ determines the geometry of space-time, whereas in the former case both the metric and the space-time connection $Γ^λ_{μν}$ are a priori independent variables - a choice which can lead to a theory of gravity different from the metric one. In scenarios where the field(s) responsible for cosmic inflation are coupled non-minimally to gravity or the gravitational sector is otherwise extended, assumptions of the underlying gravitational degrees of freedom can have a big impact on the observational consequences of inflation. We demonstrate this explicitly by reviewing several interesting and well-motivated scenarios including Higgs inflation, $R^2$ inflation, and $ξ$-attractor models. We also discuss some prospects for future research and argue why $r=10^{-3}$ is a particularly important goal for future missions that search for signatures of primordial gravitational waves.
description: 24 pages, no figures. Matches the version published in General Relativity and Gravitation
Transport Coherence in Frictional Ratchets
Creators: name: Krishnan, Raishma
name: Dan, Debasis
name: Jayannavar, A. M.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the phenomena of noise induced transport in frictional ratchet systems. For this we consider a Brownian particle moving in a space dependent frictional medium in the presence of external white noise fluctuations. To get the directed transport, unlike in other ratchet models like flashing or rocking ratchets etc., we do not require the potential experienced by the particle to be asymmetric nor do we require the external fluctuations to be correlated. We have obtained analytical expressions for current and the diffusion coefficient. We show that the frictional ratchet do not exhibit a pronounced coherence in the transport in that the diffusion spread overshadows the accompanying directed transport in system with finite spatial extensions.
description: Based on the poster presentation (by RK) at the Condensed Matter Days - 2003 held at Jadavpur University, Kolkata, India from 27-29 August 2003. Minor corrections have been done
Relaxed Averaged Alternating Reflections for Diffraction Imaging
Creators: name: Luke, D. Russell
Publisher: name: arXiv
Year: 2004
Subjects: subject: Optimization and Control (math.OC)
subject: Mathematical Physics (math-ph)
subject: Optics (physics.optics)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 30E10, 49M27, 49M45, 78M50

description: We report on progress in algorithms for iterative phase retrieval. The theory of convex optimization is used to develop and to gain insight into counterparts for the nonconvex problem of phase retrieval. We propose a relaxation of averaged alternating reflectors and determine the fixed point set of the related operator in the convex case. A numerical study supports our theoretical observations and demonstrates the effectiveness of the algorithm compared to the current state of the art.
description: 13 pages, 19 figures