cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Glass behavior of high-Tc superconductors
Creators: name: Morgenstern, Ingo
name: Müller, K. A.
name: Bednorz, J. G.
Publisher: name: Universität Regensburg
Year: 1988
Subjects: subject: 530 Physik

description: The glass behavior of high-Tc superconductors is reproduced in numerical simulations of a 2-D XY-spin-glass model. Higher critical temperatures are predicted for stronger interlayer couplings between the planes. Higher critical currents for a ceramic are expected for enhanced alignment of the planes in different grains of the material.
Why are optical coronal lines faint in active galactic nuclei?
Creators: name: McKaig, Jeffrey D.
name: Satyapal, Shobita
name: Laor, Ari
name: Abel, Nicholas P.
name: Doan, Sara M.
name: Ricci, Claudio
name: Cann, Jenna
Publisher: name: Maryland Shared Open Access Repository
Year: 2024
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Astrophysics - Astrophysics of Galaxies

description: Forbidden collisionally excited optical atomic transitions from high ionization potential (IP≥54.8\,eV) ions, such as Ca⁴⁺, Ne⁴⁺, Fe⁶⁺, Fe¹⁰⁺, Fe¹³⁺, Ar⁹⁺, and S¹¹⁺, are known as optical coronal lines (CLs). The spectral energy distribution (SED) of active galactic nuclei (AGN) typically extends to hundreds of electron volts and above, which should be able to produce such highly ionized gas. However, optical CLs are often not detected in AGN. Here we use photoionization calculations with the \textsc{Cloudy} spectral synthesis code to determine possible reasons for the rarity of these optical CLs. We calculate CL luminosities and equivalent widths from radiation pressure confined photoionized gas slabs exposed to an AGN continuum. We consider the role of dust, metallicity, and ionizing SED in the formation of optical CLs. We find that (1) dust reduces the strength of most CLs by ∼three orders of magnitude, primarily as a result of depletion of metals onto the dust grains. (2) In contrast to the CLs, the more widely observed lower IP optical lines such as [O\, III] 5007\,Å, are less affected by depletion and some are actually enhanced in dusty gas. (3) In dustless gas many optical CLs become detectable, and are particularly strong for a hard ionizing SED. This implies that prominent CL emission likely originate in dustless gas. Our calculations also suggest optical CL emission is enhanced in galaxies with low mass black holes characterized by a harder radiation field and a low dust to metal ratio. The fact that optical CLs are not widely observed in the early universe with JWST may point to rapid dust formation at high redshift.
CKU 23: Puzur-Numušda-Ibbi-Sîn 1 (3.1.19)
Creators: name: Attinger, Pascal
Publisher: name: Zenodo
Year: 2019
Subjects: sumerian
Ur
Translation
Traduction

description: Traduction Correspondence of the Kings of Ur 23: Puzur-Numušda-Ibbi-Sîn 1 (3.1.19) Pascal Attinger, 2012, actualisé en 2017
Analisi numerica del processo di calandratura di lamiere di alto spessore in acciaio
Creators: name: Ferretti, Matteo
Publisher: name: Zenodo
Year: 2025

description: In this thesis, the rolling process of steel sheet metal has been analysed. The analysis was based on "Dino 9000T" rolling  machine, made by Walter Tosto S.p.A., with the purpose to achieve a full numerical simulation of the process and then analyse the results. The metal sheet rolling process is used a lot to produce components and equipments for different kinds of industries in the chemical, the Oil and Gas, the naval and the aerospace fields. The process can produce big cylindrical metal sheets or also steel components with different shapes, but during the manufacture a lot of defects could occur, like: conical shapes and displacements in the cross direction. To avoid this defects the numerical simulation could be very important and in particular, in this task the finite element analysis using Ansys Mechanical APDL has been used both to simulate the full manufacture of a steel metal sheet with real dimensions and materials and analyse stresses and strains due to the rolling process.
KOI-126: A Triply-Eclipsing Hierarchical Triple with Two Low-Mass Stars
Creators: name: Carter, Joshua A.
name: Fabrycky, Daniel C.
name: Ragozzine, Darin
name: Holman, Matthew J.
name: Quinn, Samuel N.
name: Latham, David W.
name: Buchhave, Lars A.
name: Van Cleve, Jeffrey
name: Cochran, William D.
name: Cote, Miles T.
name: Endl, Michael
name: Ford, Eric B.
name: Haas, Michael R.
name: Jenkins, Jon M.
name: Koch, David G.
name: Li, Jie
name: Lissauer, Jack J.
name: MacQueen, Phillip J.
name: Middour, Christopher K.
name: Orosz, Jerome A.
name: Rowe, Jason F.
name: Steffen, Jason H.
name: Welsh, William F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Kepler spacecraft has been monitoring the light from 150,000 stars in its primary quest to detect transiting exoplanets. Here we report on the detection of an eclipsing stellar hierarchical triple, identified in the Kepler photometry. KOI-126 (A,(B, C)), is composed of a low-mass binary (masses M_B = 0.2413+/-0.0030 M_Sun, M_C = 0.2127+/-0.0026 M_Sun; radii R_B = 0.2543+/-0.0014 R_Sun, R_C = 0.2318+/-0.0013 R_Sun; orbital period P_1 = 1.76713+/-0.00019 days) on an eccentric orbit about a third star (mass M_A = 1.347+/-0.032 M_Sun; radius R_A = 2.0254+/-0.0098 R_Sun; period of orbit around the low-mass binary P_2 = 33.9214+/-0.0013 days; eccentricity of that orbit e_2 = 0.3043+/-0.0024). The low-mass pair probe the poorly sampled fully-convective stellar domain offering a crucial benchmark for theoretical stellar models.
description: To be published in Science on 2/4/2011. Announced at Jan. 2011 AAS meeting and made available on Science Express. Includes Supporting Online Material
High-temperature superconductivity in the apex-oxygen model: a quantum Monte Carlo study
Creators: name: Frick, M.
name: Morgenstern, Ingo
name: Von der Linden, Wolfgang
Publisher: name: Universität Regensburg
Year: 1991
Subjects: subject: 530 Physik

description: The Projector Quantum Monte Carlo Method is applied to examine the existence of superconductivity in the Apex-Oxygen-Model which describes the physics of the correlated carriers in the CuO2-planes coupled to the anharmonic vibrations of the apex oxygen in the hightemperature superconductors. The simulations show clear evidence for extendeds-wave superconductivity in the 100 K temperature range for realistic choice of coupling parameters.
Memory Effects in a Superconducting Y-Ba-Cu-O Single Crystal: A Similarity to Spin-Glasses
Creators: name: Rossel, C.
name: Maeno, Y.
name: Morgenstern, Ingo
Publisher: name: Universität Regensburg
Year: 1989
Subjects: subject: 530 Physik
subject: 74.30.Ci, 74.40.+k, 74.65.+n

description: We report on memory effects observed in the time dependence of the magnetization M(T, H) of a superconducting Y-Ba-Cu-O single crystal. As in spin-glasses, the decay rate S=dM/dlnt is not uniquely determined. It exhibits a characteristic change at time t equal to the waiting time tw during which the specimen was kept at a given temperature T
Comparative population genomics of Arctic sled dogs reveals a deep and complex history
Creators: name: Smith, Tracy
name: Srikanth, Krishnamoorthy
name: Huson, Heather Jay
Publisher: name: Oxford University Press
Year: 2024

description: Recent evidence demonstrates genomic and morphological continuity in the Arctic ancestral lineage of dogs. Here, we use the Siberian Husky to investigate the genomic legacy of the northeast Eurasian Arctic lineage and model the deep population history using genome-wide SNPs. Utilizing ancient dog calibrated molecular clocks, we found that at least two distinct lineages of Arctic dogs existed in ancient Eurasia at the end of the Pleistocene. This pushes back the origin of sled dogs in the northeast Siberian Arctic with humans likely intentionally selecting dogs to perform different functions and keeping breeding populations that overlap in time and space relatively reproductively isolated. In modern Siberian Huskies, we found significant population structure based on how they are used by humans, recent European breed introgression in about half of the dogs that participate in races, moderate levels of inbreeding, and fewer potentially harmful variants in populations under strong selection for form and function (Show, Sled-Show, and Racing populations of Siberian Huskies). As the struggle to preserve unique evolutionary lineages while maintaining genetic health intensifies across pedigreed dogs, understanding the genomic history to guide policies and best practices for breed management is crucial to sustain these ancient lineages and their unique evolutionary identity.
Numerical simulations of a high-Tc-superconductive glass model
Creators: name: Morgenstern, Ingo
name: Müller, K. A.
name: Bednorz, J. G.
Publisher: name: Universität Regensburg
Year: 1987
Subjects: subject: 530 Physik

description: Numerical simulations for anXY-spin-glass model are presented. The connection to recent experiments on high-T c superconductors is outlined. In particular, the glass behaviour in experiments is reproduced by a 2-D model. A phase diagram important for future experiments is also provided. A substantial gain inT c is predicted for enhanced couplings between planes.
Recent developments in non-Abelian T-duality in string theory
Creators: name: Sfetsos, Konstadinos
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We briefly review the essential points of our recent work in non-Abelian T-duality. In particular, we show how non-abelian T-duals can effectively describe infinitely high spin sectors of a parent theory and how to implement the transformation in the presence of non-vanishing Ramond fields in type-II supergravity.
description: 8 pages, Proceedings contribution to the 10th Hellenic School on Elementary Particle Physics and Gravity, Corfu, Greece, September 2010
Bouncing towards the optimum: Improving the results of Monte Carlo optimization algorithms
Creators: name: Schneider, Johannes
name: Morgenstern, Ingo
name: Singer, Johannes Maria
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: 530 Physik
subject: 02.70.Lq, 02.50.-r, 02.50.Ga, 89.20.+a

description: Simulated annealing and related Monte Carlo-type optimization algorithms are used to apply statistical physics concepts, in particular ideas from the statistical mechanics of spin glasses, to find optimal configurations for combinatorial optimization problems. There are formal proofs showing that these algorithms converge asymptotically (i.e.—possibly—for infinitely long simulation times) to a global optimum. Practical implementations, however, only allow for finite simulation times, and, thus, the annealing process is often trapped in energetically higher, suboptimal configurations. In this work we present an algorithm—we call it bouncing— which takes the final low-energy configuration of, e.g., a conventional monotonically cooled annealing run as an input and subjects it to a schedule of repeatedly reheating and cooling. The maximum of a susceptibility and a specific-heat-like quantity sampled during the initial monotonic cooling process serve as lower and upper starting temperature bounds for this secondary heating and cooling. We present, in addition to a serial implementation, a recipe for a parallel computer, and provide a number of results showing the success of the bouncing method for a particularly prominent example of a combinatorial optimization problem: the traveling salesman problem.
Physical structure of the envelopes of intermediate-mass protostars
Creators: name: Crimier, N.
name: Ceccarelli, C.
name: Alonso-Albi, T.
name: Fuente, A.
name: Caselli, P.
name: Johnstone, D.
name: Kahane, C.
name: Lefloch, B.
name: Maret, S.
name: Plume, R.
name: Rizzo, J. R.
name: Tafalla, M.
name: van Dishoeck, E.
name: Wyrowski, F.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: Intermediate mass protostars provide a bridge between low- and high-mass protostars. Furthermore, they are an important component of the UV interstellar radiation field. Despite their relevance, little is known about their formation process. Aims: We present a systematic study of the physical structure of five intermediate mass, candidate Class 0 protostars. Our two goals are to shed light on the first phase of intermediate mass star formation and to compare these protostars with low- and high-mass sources. Methods: We derived the dust and gas temperature and density profiles of the sample. We analysed all existing continuum data on each source and modelled the resulting SED with the 1D radiative transfer code DUSTY. The gas temperature was then predicted by means of a modified version of the code CHT96. Results: We found that the density profiles of five out of six studied intermediate mass envelopes are consistent with the predictions of the "inside-out" collapse theory.We compared several physical parameters, like the power law index of the density profile, the size, the mass, the average density, the density at 1000 AU and the density at 10 K of the envelopes of low-, intermediate, and high-mass protostars. When considering these various physical parameters, the transition between the three groups appears smooth, suggesting that the formation processes and triggers do not substantially differ.
Prospects for AGN Studies with AXIS: AGN Fueling—Resolving Hot Gas inside Bondi Radius of SMBHs
Creators: name: Wong, Ka-Wah
name: Russell, Helen R.
name: Irwin, Jimmy A.
name: Cappelluti, Nico
name: Foord, Adi
Publisher: name: MDPI
Year: 2024

description: Hot gas around a supermassive black hole (SMBH) should be captured within the gravitational “sphere of in?uence”, characterized by the Bondi radius. Deep Chandra observations have spatially resolved the Bondi radii of ?ve nearby SMBHs that are believed to be accreting in hot accretion mode. Contrary to earlier hot accretion models that predicted a steep temperature increase within the Bondi radius, none of the resolved temperature pro?les exhibit such an increase. The temperature inside the Bondi radius appears to be complex, indicative of a multi-temperature phase of hot gas with a cooler component at about 0.2–0.3 keV. The density pro?les within the Bondi regions are shallow, suggesting the presence of strong out?ows. These ?ndings might be explained by recent realistic numerical simulations that suggest that large-scale accretion inside the Bondi radius can be chaotic, with cooler gas raining down in some directions and hotter gas out?owing in others. With an angular resolution similar to Chandra and a signi?cantly larger collecting area, AXIS will collect enough photons to map the emerging accretion ?ow within and around the “sphere of in?uence” of a large sample of active galactic nuclei (AGNs). AXIS will reveal transitions in the in?ow that ultimately fuels the AGN, as well as out?ows that provide feedback to the environment. This White Paper is part of a series commissioned for the AXIS Probe Concept Mission; additional AXIS White Papers can be found at the AXIS website.
A note on isospin violation in Pl2(gamma) decays
Creators: name: Cirigliano, Vincenzo
name: Neufeld, Helmut
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the size of isospin violating effects of both electromagnetic (e \neq 0) and strong (m_u \neq m_d) origin in P_{\ell 2 (γ)} decays. Our results are relevant for the extraction of |V_{us}/V_{ud}| from the measured ratio of the K_{μ2 (γ)} and π_{μ2 (γ)} decay widths combined with F_K/F_πobtained in lattice calculations in the isospin limit. We point out that strong isospin-breaking corrections, neglected in previous studies, enter at the same level as the electromagnetic effects. The updated value for the ratio of CKM elements reads |V_{us}/V_{ud}| = 0.2316(12).
description: 10 pages, 1 figure
Getting to zero : a field-level perspective on organizational transitions towards carbon neutrality
Creators: name: Piggot, Georgia Jean
Publisher: name: University of British Columbia
Year: 2017

description: Climate change policies are proliferating at a local and regional level. Within this landscape, organizational climate change action is shifting from voluntary to mandated, and organizations are grappling with new pressures to reduce their environmental impact. This dissertation explores organizational responses to climate change policy, though a field-level analysis of 132 organizations that were required to achieve carbon neutrality in British Columbia, Canada. The strategies organizations adopted or considered over a five-year period from the policy inception are examined using survey data and a content analysis of annual reports. This study shows that the organizations bound by the carbon neutral mandate quickly came to a common understanding of what the practical expression of carbon neutrality involved. Within five years of the policy introduction, and three years of the requirement to become carbon neutral, organizations were considering or adopting a large number of similar strategies in response to the legislative requirement to reduce their carbon emissions. This convergence of strategies can be explained by several factors. First, organizations drew cues about appropriate responses from the government, and from other organizations within the field, leading to isomorphism of strategies over time. Second, the organizations were working under a common set of institutional logics, or cultural assumptions about the rationale for pursuing strategies, leading them to consider the same practices appropriate for meeting carbon neutral goals. Finally, organizations were supported by similar networks of organizations, centralizing the field around a few key actors. Similarity in responses to the mandate to achieve carbon neutrality are reflective of the fact that organizations drew from the common sources of information and resources to meet emissions reduction targets. This work demonstrates that organizational responses to climate policy should be understood with reference to the field in which organizations are embedded, rather than simply as the sum of individual organizational actions. It also highlights the fact that if the institutional and cultural conditions are right, organizational fields can rapidly emerge and adapt to new policy imperatives to tackle climate change.
Derivation of the t-J model for finite doping
Creators: name: Hamerla, Simone A.
name: Duffe, Sebastian
name: Uhrig, Götz S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Mapping complex problems to simpler effective models is a key tool in theoretical physics. One important example in the realm of strongly correlated fermionic systems is the mapping of the Hubbard model to a t-J model which is appropriate for the treatment of doped Mott insulators. Charge fluctuations across the charge gap are eliminated. So far the derivation of the t-J model is only known at half-filling or in its immediate vicinity. Here we present the necessary conceptual advancement to treat finite doping. The results for the ensuing coupling constants are presented. Technically, the extended derivation relies on self-similar continuous unitary transformations (sCUT) and normal-ordering relative to a doped reference ensemble. The range of applicability of the derivation of t-J model is determined as function of the doping $δ$ and the ratio bandwidth W over interaction U.
description: 20 pages, 31 figures
Quantum Monte Carlo evidence for d-wave pairing in the two-dimensional Hubbard model at a van Hove singularity
Creators: name: Husslein, T.
name: Morgenstern, Ingo
name: Newns, D. M
name: Pattnaik, P. C.
name: Singer, J. M.
name: Matuttis, H. G.
Publisher: name: Universität Regensburg
Year: 1996
Subjects: subject: 530 Physik
subject: 74.20.Mn

description: We implement a quantum Monte Carlo calculation for a repulsive Hubbard model with nearest- and next-nearest-neighbor hopping interactions on clusters up to 12×12. A parameter region where the Fermi level lies close to the van Hove singularity at the saddle points in the bulk band structure is investigated. A pairing tendency in the dx2-y2 symmetry channel, but no other channel, is found. Estimates of the effective pairing interaction show that it is close to the value required for a 40 K superconductor. Finite-size scaling compares with the attractive Hubbard model.
Monte-Carlo algorithm for a two-dimensional Hubbard model of high-Tc superconductivity
Creators: name: Morgenstern, Ingo
Publisher: name: Universität Regensburg
Year: 1988
Subjects: subject: 530 Physik

description: A Monte-Carlo procedure is given for the two-dimensional (2-D) Hubbard model using the Suzuki-Trotter transformation. The resulting three-dimensional (3-D) classical model does not have the usual problems with negative transition probabilities in the large-U limit (U-repulsive interactions). Numerical simulations based on the algorithm described are expected to be of importance for the theory of high-T c superconductivity.
Affordable Housing in Brunswick, MD
Creators: name: Anderson, Will
name: Edmondson-Deigh, Kaya-Nadine
name: Lehman, Erin
Publisher: name: Partnership for Action Learning Sustainability (PALS)
Year: 2023
Subjects: National Center for Smart Growth
PALS
Frederick County
Brunswick, Maryland
UMD School of Public Policy
Real Estate Development
Affordable Housing

description: Final presentation for PLCY734: Foundations of Social Policy (Fall 2023). University of Maryland, College Park
description: Brunswick is a rapidly growing city in rural Maryland that needs an affordable housing stock to keep up with its population growth. We examine if and how an Inclusionary Zoning program in the city could be used to create affordable housing units and how it would assist the city in its goal of a more integrated community. We will evaluate if an Inclusionary Zoning program would be appropriate, and we make specific recommendations for city policy. Mixed-income housing is one potential tool to provide affordable housing options to Brunswick residents. Several key factors in planning mixed income housing are evaluated, including the allocation of units to different income levels, proximity among income levels, density and housing type, tenure, and duration. Finally, we discuss why mixed income housing is right for Brunswick, and how planners can make it attractive to both subsidized and market rate occupants. Subsequently, we discuss state and federal opportunities for affordable housing, such as Community Development Block Grants and active grant opportunities through the Notice of Funding Opportunities. We highlight a federal program that provides funding for affordable senior housing. We also discuss how the support of nonprofit organizations is beneficial to this process. Finally, we end with final recommendations for Brunswick.
Do All Stars in the Solar Neighbourhood Form in Clusters?
Creators: name: Bressert, Eli
name: Bastian, Nate
name: Gutermuth, Robert
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present a global study of low mass, young stellar object (YSO) surface densities (Sigma) in nearby (< 500 pc) star forming regions based on a comprehensive collection of Spitzer Space Telescope surveys. We show that the distribution of YSO surface densities is a smooth distribution, being adequately described by a lognormal function from a few to 10^3 YSOs per pc^2, with a peak at ~22 stars pc^-2. The observed lognormal Sigma is consistent with predictions of hierarchically structured star-formation at scales below 10 pc, arising from the molecular cloud structures. We do not find evidence for multiple discrete modes of star-formation (e.g. clustered and distributed). Comparing the observed Sigma distribution to previous Sigma threshold definitions of clusters show that they are arbitrary. We find that only a low fraction (< 26$) of stars are formed in dense environments where their formation/evolution (along with their circumstellar disks and/or planets) may be affected by the close proximity of their low-mass neighbours.
description: 7 Pages, 2 Figures, JENAM conference (Lisbon)
High fidelity of RecA-catalyzed recombination: a watchdog of genetic diversity
Creators: name: Sagi, Dror
name: Tlusty, Tsvi
name: Stavans, Joel
Publisher: name: arXiv
Year: 2010
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: Homologous recombination plays a key role in generating genetic diversity, while maintaining protein functionality. The mechanisms by which RecA enables a single-stranded segment of DNA to recognize a homologous tract within a whole genome are poorly understood. The scale by which homology recognition takes place is of a few tens of base pairs, after which the quest for homology is over. To study the mechanism of homology recognition, RecA-promoted homologous recombination between short DNA oligomers with different degrees of heterology was studied in vitro, using fluorescence resonant energy transfer. RecA can detect single mismatches at the initial stages of recombination, and the efficiency of recombination is strongly dependent on the location and distribution of mismatches. Mismatches near the 5' end of the incoming strand have a minute effect, whereas mismatches near the 3' end hinder strand exchange dramatically. There is a characteristic DNA length above which the sensitivity to heterology decreases sharply. Experiments with competitor sequences with varying degrees of homology yield information about the process of homology search and synapse lifetime. The exquisite sensitivity to mismatches and the directionality in the exchange process support a mechanism for homology recognition that can be modeled as a kinetic proofreading cascade.
description: http://www.weizmann.ac.il/complex/tlusty/papers/NuclAcidRes2006.pdf http://nar.oxfordjournals.org/cgi/content/short/34/18/5021
A white dwarf companion to the relativistic pulsar PSR J1141-6545
Creators: name: Antoniadis, J.
name: Bassa, C. G.
name: Wex, N.
name: Kramer, M.
name: Napiwotzki, R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Pulsars with compact companions in close eccentric orbits are unique laboratories for testing general relativity and alternative theories of gravity. Moreover, they are excellent targets for future gravitational wave experiments like LISA and they are also highly important for understanding the equation of state of super-dense matter and the evolution of massive binaries. Here we report on optical observations of the 1.02 M_sun companion to the pulsar PSR J1141-6545. We detect an optical counterpart with apparent magnitudes V=25.08(11) and R=24.38(14), consistent with the timing position of the pulsar. We demonstrate that our results are in agreement with a white dwarf companion. However the latter is redder than expected and the inferred values are not consistent with the theoretical cooling tracks, preventing us from deriving the exact age. Our results confirm the importance of the PSR J1141-6545 system for gravitational experiments.
description: 5 pages, 4 figures, accepted for publication in MNRAS
SPEEDUP Code for Calculation of Transition Amplitudes via the Effective Action Approach
Creators: name: Balaz, Antun
name: Vidanovic, Ivana
name: Stojiljkovic, Danica
name: Vudragovic, Dusan
name: Belic, Aleksandar
name: Bogojevic, Aleksandar
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present Path Integral Monte Carlo C code for calculation of quantum mechanical transition amplitudes for 1D models. The SPEEDUP C code is based on the use of higher-order short-time effective actions and implemented to the maximal order $p$=18 in the time of propagation (Monte Carlo time step), which substantially improves the convergence of discretized amplitudes to their exact continuum values. Symbolic derivation of higher-order effective actions is implemented in SPEEDUP Mathematica codes, using the recursive Schroedinger equation approach. In addition to the general 1D quantum theory, developed Mathematica codes are capable of calculating effective actions for specific models, for general 2D and 3D potentials, as well as for a general many-body theory in arbitrary number of spatial dimensions.
description: 17 pages, 3 figures, uses cicp.cls
Quantum Monte Carlo study of quasiparticles in the Hubbard model
Creators: name: Von der Linden, Wolfgang
name: Morgenstern, Ingo
name: Raedt, H. de
Publisher: name: Universität Regensburg
Year: 1990
Subjects: subject: 530 Physik
subject: 05.30.Fk, 71.10.+x, 71.30.+h

description: We present an improved version of the projector quantum Monte Carlo method, which has recently been proposed by Sorella et al. This scheme allows a very precise computation of the ground-state energy of fermionic models. The ‘‘minus sign’’ has been treated without further approximations and does not influence the accuracy. In this paper we focus on the question of the existence of quasiparticles in the Hubbard model in one dimension and resolve the controversy concerning the discontinuity in the momentum distribution function between recent quantum Monte Carlo and weak-coupling renormalization-group techniques.
Addressing Algorithmic Unfairness in Healthcare Artificial Intelligence
Creators: name: Tschider, Charlotte
Publisher: name: Center for ELSI Resources and Analysis
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Ethics
subject: Science
subject: ELSI
subject: artificial intelligence
subject: proxy discrimination
subject: big data
subject: data privacy

description: Artificial intelligence (AI) healthcare technology can solve our most complex and intransigent health issues. It has the potential to enhance healthcare quality, improve access, reduce cost, and deliver highly personalized care. However, delivering those solutions requires large, historical, broadly representative, and well-organized data from an affected population as well as from the individual that is seeking care. Without representative data and algorithms that render fair, accurate results, AI will exacerbate, rather than solve, longstanding health issues, especially for individuals that suffer from healthcare disparities.
SEpM 6: Ursaga à un roi (3.3.1)
Creators: name: Attinger, Pascal
Publisher: name: Zenodo
Year: 2019
Subjects: sumerian
Translation
Traduction

description: Traduction The Sumerian Epistolary Miscellany 6: Ursaga à un roi (3.3.1) Pascal Attinger, 2013, actualisé en 2019
Two-dimensional Ising model in random magnetic fields
Creators: name: Morgenstern, Ingo
name: Binder, K.
Publisher: name: Universität Regensburg
Year: 1981
Subjects: subject: 530 Physik

description: The statistical mechanics of finite L×L Ising square lattices in a field ±h of random sign is investigated numerically by a modified recursive transfer matrix method for 6
Tracking Supermassive Black Hole Mergers from kpc to sub-pc Scales with AXIS
Creators: name: Foord, Adi
name: Cappelluti, Nico
name: Liu, Tingting
name: Volonteri, Marta
name: Habouzit, Melanie
name: Pacucci, Fabio
name: Marchesi, Stefano
name: Chen, Nianyi
name: Di Matteo, Tiziana
name: Mallick, Labani
name: Koss, Michael
Publisher: name: MDPI
Year: 2024

description: We present an analysis showcasing how the Advanced X-ray Imaging Satellite (AXIS), a proposed NASA Probe-class mission, will signi?cantly increase our understanding of supermassive black holes undergoing mergers—from kpc to sub-pc scales. In particular, the AXIS point spread function, ?eld of view, and effective area are expected to result in (1) the detection of hundreds to thousands of new dual AGNs across the redshift range 0 < z < 5 and (2) blind searches for binary AGNs that are exhibiting merger signatures in their light curves and spectra. AXIS will detect some of the highest-redshift dual AGNs to date, over a large range of physical separations. The large sample of AGN pairs detected by AXIS (over a magnitude more than currently known) will result in the ?rst X-ray study that quanti?es the frequency of dual AGNs as a function of redshift up to z = 4.
Lytic Bacteriophage EFA1 Modulates HCT116 Colon Cancer Cell Growth and Upregulates ROS Production in an Enterococcus faecalis Co-culture System
Creators: name: Kabwe, Mwila
name: Meehan-Andrews, Terri
name: Ku, Heng
name: Petrovski, Steve
name: Batinovic, Steven
name: Chan, Hiu Tat
name: Tucci, Joseph
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 3107
subject: Microbiology
subject: FOS: Biological sciences

description: Enterococcus faecalis is an opportunistic pathogen in the gut microbiota that’s associated with a range of difficult to treat nosocomial infections. It is also known to be associated with some colorectal cancers. Its resistance to a range of antibiotics and capacity to form biofilms increase its virulence. Unlike antibiotics, bacteriophages are capable of disrupting biofilms which are key in the pathogenesis of diseases such as UTIs and some cancers. In this study, bacteriophage EFA1, lytic against E. faecalis, was isolated and its genome fully sequenced and analyzed in silico. Electron microscopy images revealed EFA1 to be a Siphovirus. The bacteriophage was functionally assessed and shown to disrupt E. faecalis biofilms as well as modulate the growth stimulatory effects of E. faecalis in a HCT116 colon cancer cell co-culture system, possibly via the effects of ROS. The potential exists for further testing of bacteriophage EFA1 in these systems as well as in vivo models.
Improving dynamic performance in dc microgrids using trajectory control
Creators: name: Bianchi, Marco Andrés
Publisher: name: University of British Columbia
Year: 2017

description: Direct-current (dc) microgrids interconnect dc loads, distributed renewable energy sources, and energy storage elements within networks that can operate independently from the main grid. Due to their high efficiency, increasing technological viability and resilience to natural disturbances, they are set to gain popularity. When load-side converters in a microgrid tightly regulate their output voltages, they are seen as constant power loads (CPLs) from the standpoint of the source-end converters. CPLs can cause instability within the network, including large voltage drops or oscillations in the dc bus during load transients, which can lead to dc bus voltage collapse. Traditionally, the stability of CPL-loaded dc microgrids relies on the addition of passive elements, usually leading to dc-bus capacitance increase. In this scenarios, source-end converters controllers are usually linear dual proportional-integral (PI) compensators. The limited dynamic response of these controllers exacerbates the CPL behavior, which leads to the use of larger passive elements. Recent contributions focus on implementing control modifications on the source-end converter in order to improve the system performance under CPLs. Particularly, the use of state-plane based controllers has been studied for the case of a single dc-dc power converter loaded by a CPL, showing fast and robust transient performance. However, the microgrid problem, where these faster converters interface with others of a slower response has not been studied thoroughly. This work proposes the use of a fast state-plane controller to replace one of the system’s source-end converters controllers in order to improve three aspects of the microgrid operation: resiliency under CPL's steps, load transient voltage regulation, and voltage transient recovery time. Since the converter is operating within a microgrid, the controller incorporates a traditional droop rule to enable current sharing with the rest of the converters of the network. The small-signal stability improvement of the whole system obtained by the addition of a single faster controller is analyzed for a linear model, and a parametric analysis demonstrates the improvements in a detailed model. Simulations and experimental results of a microgrid with three converters feeding a CPL prove the effectiveness of the technique for large-signal transients.
On Duplication in Mathematical Repositories
Creators: name: Grabowski, Adam
name: Schwarzweller, Christoph
Publisher: name: arXiv
Year: 2010
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: Building a repository of proof-checked mathematical knowledge is without any doubt a lot of work, and besides the actual formalization process there also is the task of maintaining the repository. Thus it seems obvious to keep a repsoitory as small as possible, in particular each piece of mathematical knowledge should be formalized only once. In this paper, however, we claim that it might be reasonable or even necessary to duplicate knowledge in a mathematical repository. We analyze different situations and reasons for doing so and provide a number of examples supporting our thesis.
description: To appear in The 9th International Conference on Mathematical Knowledge Management: MKM 2010
Lytic Bacteriophage EFA1 Modulates HCT116 Colon Cancer Cell Growth and Upregulates ROS Production in an Enterococcus faecalis Co-culture System
Creators: name: Mwila Kabwe
name: Meehan-Andrews, Terri
name: Ku, Heng
name: Petrovski, Steve
name: Batinovic, Steven
name: Hiu Tat Chan
name: Tucci, Joseph
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: Enterococcus faecalis is an opportunistic pathogen in the gut microbiota that’s associated with a range of difficult to treat nosocomial infections. It is also known to be associated with some colorectal cancers. Its resistance to a range of antibiotics and capacity to form biofilms increase its virulence. Unlike antibiotics, bacteriophages are capable of disrupting biofilms which are key in the pathogenesis of diseases such as UTIs and some cancers. In this study, bacteriophage EFA1, lytic against E. faecalis, was isolated and its genome fully sequenced and analyzed in silico. Electron microscopy images revealed EFA1 to be a Siphovirus. The bacteriophage was functionally assessed and shown to disrupt E. faecalis biofilms as well as modulate the growth stimulatory effects of E. faecalis in a HCT116 colon cancer cell co-culture system, possibly via the effects of ROS. The potential exists for further testing of bacteriophage EFA1 in these systems as well as in vivo models.
Solving the Coulomb scattering problem using the complex scaling method
Creators: name: Volkov, M. V.
name: Elander, N.
name: Yarevsky, E.
name: Yakovlev, S. L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Based on the work of Nuttall and Cohen [Phys. Rev. {\bf 188} (1969) 1542] and Resigno et al{} [Phys. Rev. A {\bf 55} (1997) 4253] we present a rigorous formalism for solving the scattering problem for long-range interactions without using exact asymptotic boundary conditions. The long-range interaction may contain both Coulomb and short-range potentials. The exterior complex scaling method, applied to a specially constructed inhomogeneous Schrödinger equation, transforms the scattering problem into a boundary problem with zero boundary conditions. The local and integral representations for the scattering amplitudes have been derived. The formalism is illustrated with numerical examples.
description: 3 pages, 3 figures
SEpM 7: Lugalšu à un roi (3.3.2)
Creators: name: Attinger, Pascal
Publisher: name: Zenodo
Year: 2019
Subjects: sumerian
Translation
Traduction

description: Traduction SEpM 7: Lugalšu à un roi (3.3.2) Pascal Attinger, 2013, actualisé en 2019
Volume Scattering Analysis of Titan’s lakes and seas via Cassini RADAR Altimetric Observations
Creators: name: Gambacorta, L.
name: Mastrogiuseppe, M.
name: Raguso, M. C.
name: Poggiali, V.
name: Cordier, D.
name: Farnsworth, Kendra
name: Seu, R.
Publisher: name: IEEE
Year: 2024
Subjects: Lakes
radiative equilibrium
Radar
Radar cross-sections
radar sounder
Satellites
Saturn
Sea surface
radar altimetry
Titan
Surface topography
Mie scattering theory
Cassini

description: This paper presents a study to assess the characteristics of particles or bubbles possibly present on Titan’s lakes and seas using Cassini RADAR observations when operating in altimetry/sounder mode. We developed an analytical model for the Surface-to-Volume power Ratio (SVR) which includes the principles of radiative equilibrium and Mie scattering theory. The model considers the effects due to extinction phenomena and can be used to extract valuable information on the presence of dust particles or bubbles in Titan’s liquid bodies. The absence of volume scattering in the altimetric waveforms is used to constrain the maximum density at various radii of the possible presence of nitrogen bubbles or solid particles, such as water ice, nitriles, and tholins.
HIV dynamics and natural history studies: Joint modeling with doubly interval-censored event time and infrequent longitudinal data
Creators: name: Su, Li
name: Hogan, Joseph W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Hepatitis C virus (HCV) coinfection has become one of the most challenging clinical situations to manage in HIV-infected patients. Recently the effect of HCV coinfection on HIV dynamics following initiation of highly active antiretroviral therapy (HAART) has drawn considerable attention. Post-HAART HIV dynamics are commonly studied in short-term clinical trials with frequent data collection design. For example, the elimination process of plasma virus during treatment is closely monitored with daily assessments in viral dynamics studies of AIDS clinical trials. In this article instead we use infrequent cohort data from long-term natural history studies and develop a model for characterizing post-HAART HIV dynamics and their associations with HCV coinfection. Specifically, we propose a joint model for doubly interval-censored data for the time between HAART initiation and viral suppression, and the longitudinal CD4 count measurements relative to the viral suppression. Inference is accomplished using a fully Bayesian approach. Doubly interval-censored data are modeled semiparametrically by Dirichlet process priors and Bayesian penalized splines are used for modeling population-level and individual-level mean CD4 count profiles. We use the proposed methods and data from the HIV Epidemiology Research Study (HERS) to investigate the effect of HCV coinfection on the response to HAART.
description: Published in at http://dx.doi.org/10.1214/10-AOAS391 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Monte-Carlo calculation of the lateral Casimir forces between rectangular gratings within the formalism of lattice quantum field theory
Creators: name: Pavlovsky, Oleg
name: Ulybyshev, Maxim
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a new Monte-Carlo method for calculation of the Casimir forces. Our method is based on the formalism of noncompact lattice quantum electrodynamics. This approach has been tested in the simplest case of two ideal conducting planes. After this the method has been applied to the calculation of the lateral Casimir forces between two ideal conducting rectangular gratings. We compare our calculations with the results of PFA and "Optimal" PFA methods.
description: 12 pages, 6 figures, accepted in Int. J. Mod. Phys. A
Finite-size scaling study of the two-dimensional Ising spin glass
Creators: name: Morgenstern, Ingo
name: Huse, David A.
Publisher: name: Universität Regensburg
Year: 1985
Subjects: subject: 530 Physik
subject: 75.10.Hk, 05.50.+q

description: We have calculated finite-size correlation lengths for strips of the square-lattice Ising spin glass using the transfer-matrix method. In order to minimize sampling errors we study strip lengths up to 5×106 lattice spacings. A phenomenological renormalization-group analysis indicates that there are strong corrections to simple power-law scaling near the zero-temperature critical point, as is to be expected near a lower critical dimension. We examine models with Gaussian, exp(-J2/2), and exponential, exp(-‖J‖), distributions of couplings; the Gaussian distribution shows stronger finite-size corrections. The correlation-length exponent is estimated to be ν=4.2±0.5, although we do not want to rule out the possibility that ν is significantly larger than this.
On the gluon spectrum in the glasma
Creators: name: Blaizot, J. -P.
name: Lappi, T.
name: Mehtar-Tani, Y.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the gluon distribution in nucleus-nucleus collisions in the framework of the Color-Glass-Condensate. Approximate analytical solutions are compared to numerical solutions of the non-linear Yang-Mills equations. We find that the full numerical solution can be well approximated by taking the full initial condition of the fields in Coulomb gauge and using a linearized solution for the time evolution. We also compare kt-factorized approximations to the full solution.
description: 13 pages, 12 figures, RevTeX
Aerosol components derived from global AERONET measurements by GRASP: A new value-added aerosol component global dataset and its application
Creators: name: Zhang, Xindan
name: Li, Lei
name: Che, Huizheng
name: Dubovik, Oleg
name: Derimian, Yevgeny
name: Holben, Brent
name: Gupta, Pawan
name: Eck, Thomas F.
name: Lind, Elena S.
name: Toledano, Carlos
name: Xia, Xiangao
name: Zheng, Yu
name: Gui, Ke
name: Zhang, Xiaoye
Publisher: name: AMS
Year: 2024

description: Aerosols affect the Earth’s climate both directly and indirectly, which is the largest uncertainty in the assessment of radiative forcings affecting anthropogenic climate change. The standard AErosol RObotic NETwork (AERONET) aerosol products have been widely used for more than thirty years. Currently, there is strong community interest in the possibility of determining aerosol composition directly from remote sensing observations. This work presents the results of applying such a recently developed approach by Li et al. (2019) to extended data sets of the directional sky radiances and spectral aerosol optical depth (AOD) measured by AERONET for the retrievals of aerosol components. First, the validation of aerosol optical properties retrieved by this component approach with AERONET standard products shows good agreement. Then, spatio-temporal variations of obtained aerosol component concentration are characterized globally, especially the absorbing aerosol species (black carbon, brown carbon and iron oxides) and scattering aerosol species (organic carbon, quartz, and inorganic salts). Finally, we compared the black carbon (BC) and dust column concentration retrievals to the Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) products in several regions of interest (Amazon zone, Indo-China Peninsula, North India, Southern Africa, Sub-Sahel, Gobi Desert, Middle East, Sahara Desert, Taklamakan Desert) for new insights on the quantitative assessment of MERRA-2 aerosol composition products (R = 0.60 ~ 0.85 for BC; R = 0.75 ~ 0.90 for dust). The new value-added and long-term aerosol composition product globally is available at https://doi.org/10.6084/m9.figshare.25415239.v1, which provide important measurements for the improvement and optimization of aerosol modelling to enhanced estimate the aerosol radiative forcing.