cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Thermodynamics of compact-star matter within an ising approach
Creators: name: Chomaz, P.
name: Ducoin, C.
name: Gulminelli, F.
name: Hasnaoui, K. H. O.
name: Napolitani, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In the formation and evolution of compact stars, nuclear matter explores high thermal excursions and is the site of intense neutrino emission. Neutrino transport as well as structural properties of this matter depend on the presence of inhomogeneous phases (named "pasta" phases), which are the result of Coulomb frustration of the Liquid-Gas phase transition. We take into account charge fluctuations by employing a frustrated lattice-gas model to which we impose a neutrality constraint by the addition of an homogeneous background of charge, representing delocalised electrons. Within this schematic model we highlight a generaic feature of the phase-transition phenomenology: the temperature interval where pasta phases are formed is enhanced by Coulomb-frustration effects. This result is at variance with the behaviour of frustrated ferromagnetic systems as well as hot nuclei and mean-field approaches. Moreover, the region of phase coexistence is not found to end upon a critical point, indicating that no critical opalescence can occur in compact-star matter.
description: International Conference on Nucleus Nucleus Collisions 2006
Effects of Lagrangian Multipliers on SWCNT in Real Space
Creators: name: Sunel, N.
name: Rizaoglu, E.
name: Harigaya, K.
name: Ozsoy, O.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Electronic properties, band width, band gap and van Hove singularities, of (3,0), (4,0) and (9,0) zigzag nanotubes are comparatively investigated in the Harigaya's model and a toy model including the contributions of bonds of different types to the SSH Hamiltonian differently. Optical transition frequencies are calculated. In this way an experimental correlation between the two models is achieved.
description: accepted for publication in Int. J. Quantum Chem.; 11 pages; 5 figures
An efficient pre-object collimator based on an x-ray lens
Creators: name: Fredenberg, Erik
name: Cederstrom, Bjorn
name: Aslund, Magnus
name: Nillius, Peter
name: Danielsson, Mats
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: A multi-prism lens (MPL) is a refractive x-ray lens with one-dimensional focusing properties. If used as a pre-object collimator in a scanning system for medical x-ray imaging, it reduces the divergence of the radiation and improves on photon economy compared to a slit collimator. Potential advantages include shorter acquisition times, a reduced tube loading, or improved resolution. We present the first images acquired with an MPL in a prototype for a scanning mammography system. The lens showed a gain of flux of 1.32 compared to a slit collimator at equal resolution, or a gain in resolution of 1.31-1.44 at equal flux. We expect the gain of flux in a clinical set-up with an optimized MPL and a custom-made absorption filter to reach 1.67, or 1.45-1.54 gain in resolution.
Dynamical friction in constant density cores: a failure of the Chandrasekhar formula
Creators: name: Read, J. I.
name: Goerdt, Tobias
name: Moore, Ben
name: Pontzen, A. P.
name: Stadel, Joachim
name: Lake, George
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using analytic calculations and N-body simulations we show that in constant density (harmonic) cores, sinking satellites undergo an initial phase of very rapid (super-Chandrasekhar) dynamical friction, after which they experience no dynamical friction at all. For density profiles with a central power law profile of log-slope, $-α$, the infalling satellite heats the background and causes $α$ to decrease. For $α< 0.5$ initially, the satellite generates a small central constant density core and stalls as in the $α= 0$ case. We discuss some astrophysical applications of our results to decaying satellite orbits, galactic bars and mergers of supermassive black hole binaries. In a companion paper we show that a central constant density core can provide a natural solution to the timing problem for Fornax's globular clusters.
description: 11 pages, 7 figures. Final version accepted for publication in MNRAS
Solar abundances and helioseismology: fine structure spacings and separation ratios of low-degree p modes
Creators: name: Basu, Sarbani
name: Chaplin, William J.
name: Elsworth, Yvonne
name: New, Roger
name: Serenelli, Aldo M.
name: Verner, Graham A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We have used 4752 days of data collected by the Birmingham Solar-Oscillations Network (BiSON) to determine very precise oscillation frequencies of acoustic low-degree modes that probe the solar core. We compare the fine (small frequency) spacings and frequency separation ratios formed from these data with those of different solar models. We find that models constructed with low metallicity are incompatible with the observations. The results provide strong support for lowering the theoretical uncertainties on the neutrino fluxes. These uncertainties had recently been raised due to the controversy over the solar abundances.
description: To appear in ApJ
Gravitational form-factors of the $ π$ and $ K $ mesons in QCD sum rules
Creators: name: Aliev, T. M.
name: Şimşek, K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Taking into account only the quark part of the energy-momentum tensor, the gravitational form-factors of the $ π$ and $ K $ mesons are calculated within the light-cone sum rules method using the distribution amplitudes of these pseudoscalar mesons. The $ Q^2 $-dependence of the relevant form-factors are obtained. Moreover, the mean square mass radii of $ π$ and $ K $ mesons are calculated and we find that $ \sqrt{\langle r_π^2 \rangle} = 0.31 {\rm\ fm} $ and $ \sqrt{\langle r_{K}^2 \rangle} = 0.24 {\rm\ fm} $, respectively. We compare our results for gravitational form-factors with the existing literature results. We obtain that our results on $ \sqrt{\langle r_π^2 \rangle} $ are in good agreement with the predictions of NJL model, AdS/QCD model, and other models as well as with the existing experimental data.
description: 11 pages, 4 figures
Carineta diardi
Creators: name: De Santis, Cecilia L.
name: Medrano, María Celeste
name: Sanborn, Allen F.
name: Bolcatto, Pablo G.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadidae
Carineta
Carineta diardi

description: Carineta diardi (Guérin – Méneville, 1829) (Figura 1b)
· MFA-ZI- N°°° 8331. Prov. Misiones (27°38’, 55°88’), RA. 2♂.
description: Published as part of De Santis, Cecilia L., Medrano, María Celeste, Sanborn, Allen F. & Bolcatto, Pablo G., 2007, Cicádidos (Insecta: Hemiptera: Cicadidae) Del Museo Provincial De Ciencias Naturales " Florentino Ameghino " Santa Fe, Argentina, pp. 1-19 in Museo Provincial de Ciencias Naturales " Florentino Ameghino " Serie Catálogo 19 on page 3, DOI: 10.5281/zenodo.8228308
Gravitational waves and cosmological braneworlds: a characteristic evolution scheme
Creators: name: Seahra, Sanjeev S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Motivated by the problem of the evolution of bulk gravitational waves in Randall-Sundrum cosmology, we develop a characteristic numerical scheme to solve 1+1 dimensional wave equations in the presence of a moving timelike boundary. The scheme exhibits quadratic convergence, is capable of handling arbitrary brane trajectories, and is easily extendible to non-AdS bulk geometries. We use our method to contrast two different prescriptions for the bulk fluctuation initial conditions found in the literature; namely, those of Hiramatsu et al. (hep-th/0410247) and Ichiki and Nakamura (astro-ph/0406606). We find that if the initial data surface is set far enough in the past, the late time waveform on the brane is insensitive to the choice between the two possibilities; and we present numeric and analytic evidence that this phenomenon generalizes to more generic initial data. Observationally, the main consequence of this work is to re-affirm previous claims that the stochastic gravitational wave spectrum is predominantly flat, in contradiction with naive predictions from the effective 4-dimensional theory. Furthermore, this flat spectrum result is predicted to be robust against uncertainties in (or modifications of) the bulk initial data, provided that the energy scale of brane inflation is high enough.
description: 21 pages, 18 figures. Points of clarification added to Secs. V and VIIA concerning initial conditions and basis functions, respectively. Other minor typos corrected, references updated. To appear in PRD
Chonosia crassipennis
Creators: name: De Santis, Cecilia L.
name: Medrano, María Celeste
name: Sanborn, Allen F.
name: Bolcatto, Pablo G.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadidae
Chonosia
Chonosia crassipennis

description: Chonosia crassipennis (Walker, 1858) (Figura 1c)
· MFA-ZI- N°°° 2681. (Parque Sarmiento) Córdoba (31°4’, 64°18’), Dpto. Capital, Prov. Córdoba, RA, 11/I/37. 1♂.
description: Published as part of De Santis, Cecilia L., Medrano, María Celeste, Sanborn, Allen F. & Bolcatto, Pablo G., 2007, Cicádidos (Insecta: Hemiptera: Cicadidae) Del Museo Provincial De Ciencias Naturales " Florentino Ameghino " Santa Fe, Argentina, pp. 1-19 in Museo Provincial de Ciencias Naturales " Florentino Ameghino " Serie Catálogo 19 on page 3, DOI: 10.5281/zenodo.8228308
Circuit-based quantum random access memory for classical data with continuous amplitudes
Creators: name: de Veras, Tiago M. L.
name: de Araujo, Ismael C. S.
name: Park, Daniel K.
name: da Silva, Adenilton J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Emerging Technologies (cs.ET)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Loading data in a quantum device is required in several quantum computing applications. Without an efficient loading procedure, the cost to initialize the algorithms can dominate the overall computational cost. A circuit-based quantum random access memory named FF-QRAM can load M n-bit patterns with computational cost O(CMn) to load continuous data where C depends on the data distribution. In this work, we propose a strategy to load continuous data without post-selection with computational cost O(Mn). The proposed method is based on the probabilistic quantum memory, a strategy to load binary data in quantum devices, and the FF-QRAM using standard quantum gates, and is suitable for noisy intermediate-scale quantum computers.
Dorisiana drewseni
Creators: name: De Santis, Cecilia L.
name: Medrano, María Celeste
name: Sanborn, Allen F.
name: Bolcatto, Pablo G.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadidae
Dorisiana
Dorisiana drewseni

description: Dorisiana drewseni (Stål, 1854) (Figura 1d)
Esta especie es de un tamaño mediano, pudiendo variar el largo de su cuerpo de 19 a 25 mm y de las tegminas de 25 a 30 mm. Las mediciones de los ejemplares locales indican una media del largo de cuerpo de 20.9 ± 0.5 mm para machos (De Santis, 2003). Sus principales caracteres diferenciales son: cabeza con una franja transversal negra en la región del vertex. Frente abajo muy poco convexa, de color verde ocrácea; rostro de igual color, con la extremidad distal del tercer artejo negro y alcanzando las coxas posteriores. Pronoto verde ocráceo, sin estar manchado de negro. Metanoto presentando cuatro manchas negras de forma cónica, las dos centrales más cortas. Patas de color ocráceo, con los tarsos oscuros. Tegminas hialinas. Urostergos oscuros, con su borde anterior ocráceo. Urosternos de color ocráceo.
· MFA-ZI- N°°° 7289. San José del Rincón (31°6’, 60°58’), Dpto. La Capital, Prov. Santa Fe, RA, 17/I/56. 1♀.
· MFA-ZI- N°°° 7290. Recreo (31°5’, 60°73’), Dpto. La Capital, Prov. Santa Fe, RA, 2da/ I/54. 2♀.
description: Published as part of De Santis, Cecilia L., Medrano, María Celeste, Sanborn, Allen F. & Bolcatto, Pablo G., 2007, Cicádidos (Insecta: Hemiptera: Cicadidae) Del Museo Provincial De Ciencias Naturales " Florentino Ameghino " Santa Fe, Argentina, pp. 1-19 in Museo Provincial de Ciencias Naturales " Florentino Ameghino " Serie Catálogo 19 on page 4, DOI: 10.5281/zenodo.8228308
Spacetime foam at a TeV
Creators: name: Anchordoqui, Luis A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Motivated by recent interest in TeV-scale gravity and especially by the possibility of fast baryon decay mediated by virtual black holes, we study another dangerous aspect of spacetime foam interactions: lepton flavor violation. We correlate existing limits on gravity-induced decoherence in the neutrino sector with a lower bound on the scale of quantum gravity, and find that if spacetime foam interactions do not allow an S-matrix description the UV cutoff is well beyond the electroweak scale. This suggests that string theory provides the appropriate framework for description of quantum gravity at the TeV-scale.
description: Talk given at TeV Particle Astrophysics II (Madison WI, 28-31 August 2006). To be published in J. Phys. Conf. Ser
Energy resolution of a photon-counting silicon strip detector
Creators: name: Fredenberg, Erik
name: Lundqvist, Mats
name: Cederstrom, Bjorn
name: Aslund, Magnus
name: Danielsson, Mats
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: A photon-counting silicon strip detector with two energy thresholds was investigated for spectral X-ray imaging in a mammography system. Preliminary studies already indicate clinical benefit of the detector, and the purpose of the present study is optimization with respect to energy resolution. Factors relevant for the energy response were measured, simulated, or gathered from previous studies, and used as input parameters to a cascaded detector model. Threshold scans over several X-ray spectra were used to calibrate threshold levels to energy, and to validate the model. The energy resolution of the detector assembly was assessed to range over DeltaE/E = 0.12-0.26 in the mammography region. Electronic noise dominated the peak broadening, followed by charge sharing between adjacent detector strips, and a channel-to-channel threshold spread. The energy resolution may be improved substantially if these effects are reduced to a minimum. Anti-coincidence logic mitigated double counting from charge sharing, but erased the energy resolution of all detected events, and optimization of the logic is desirable. Pile-up was found to be of minor importance at typical mammography rates.
Supplementary Material from Basicranial evidence suggests picrodontid mammals are not stem primates
Creators: name: Crowell, Jordan W.
name: Wible, John R.
name: Chester, Stephen G. B.
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310401
subject: Animal systematics and taxonomy
classificationCode: 310411
subject: Plant and fungus systematics and taxonomy
classificationCode: 310499
subject: Evolutionary biology not elsewhere classified
classificationCode: 370506
subject: Palaeontology (incl. palynology)

description: Detailed descriptions and comparisons of the cranial morphology of Zanycteris paleocenus, cladistic methodology, the character-taxon matrix, and associated figures.
Dorisiana viridis
Creators: name: De Santis, Cecilia L.
name: Medrano, María Celeste
name: Sanborn, Allen F.
name: Bolcatto, Pablo G.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadidae
Dorisiana
Dorisiana viridis

description: Dorisiana viridis (Olivier, 1970) (Figura 1e)
Esta especie es de tamaño medio, presenta un largo de cuerpo de 23.8mm ±1.0 mm. Es de coloración general verde claro. Cabeza con dos líneas negras transversal en la región del vertex que se originan en el borde interno de los ojos hacia los ocelos. Ocelos incluidos en una mancha negra. El vértice del rostro presenta una franja transversal negra. Pronoto con dos líneas negras paralelas ubicadas en el borde anterior y posterior del mismo, siendo la primera más larga. Metanoto presentando cuatro manchas ocráceas de forma semielípticas, las dos centrales más cortas. Tegminas hialinas. Urostergos y urosternos de color verde ocráceo.
· MFA-ZI- N°°° 4404. Vera (29°46’, 60°21’), Dpto. Vera, Prov. Santa Fe, RA, 3/XII/97, Del Barco. 2♂.
description: Published as part of De Santis, Cecilia L., Medrano, María Celeste, Sanborn, Allen F. & Bolcatto, Pablo G., 2007, Cicádidos (Insecta: Hemiptera: Cicadidae) Del Museo Provincial De Ciencias Naturales " Florentino Ameghino " Santa Fe, Argentina, pp. 1-19 in Museo Provincial de Ciencias Naturales " Florentino Ameghino " Serie Catálogo 19 on page 4, DOI: 10.5281/zenodo.8228308
The variational method, backreactions, and the absorption probability in Wald type problems
Creators: name: Düztaş, Koray
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We argue that the variational method in Wald type thought experiments, involves order of magnitude problems when one imposes the fact that $δM$ is inherently a first order quantity itself. One observes that the contribution of the second order perturbations is actually of the fourth order. Therefore backreactions have to be explicitly calculated. Here, we re-consider the overspinning problem for Kerr-Newman black holes interacting with test fields. We calculate the backreaction effects due to the induced increase in the angular velocity of the event horizon, which brings a partial solution to the overspinning problem. To bring an ultimate solution, we argue that the absorption probability should be taken into account in Wald type problems where black holes interact with test fields. This fundamentally alters the course of the analysis of the thought experiments. Due to the fact that a small fraction of the challenging modes is absorbed by the black holes, overspinning is prevented for both nearly extremal and extremal cases. Some extreme cases are easily fixed by backreaction effects. The arguments do not apply to the generic overspinning by fermionic fields for which the absorption probability is positive definite.
description: Accepted to appear in European Physical Journal C
Clustering-Based Evolutionary Approaches for Increasing Solution Diversity in Multi-Criteria Optimization
Creators: name: Gupta, Shivali
Publisher: name: Maryland Shared Open Access Repository
Year: 2008
Subjects: Computer Science (0984)

description: Multi-criteria optimization problems have been the focus of many research efforts in the past. Researchers have applied a variety of methods, especially genetic algorithms, to produce a diverse set of non-dominated solutions to these problems. However, there is a tradeoff between the quality and diversity of solutions. The Vector Evaluated Genetic Algorithm (VEGA) creates a set of mostly non-dominated solutions (Schaffer 1985). However, genetic drift creates causes most of the solutions to be identical to each other. The Niched Pareto genetic algorithm (NPGA) introduces diversity in the solution set by creating niches, but the tradeoff is that the overall quality of the solutions deteriorates (Horn, Nafpliotis, & Goldberg 1994). This work presents a clustering-based approach Clustering-Based Genetic; Algorithm, or CBGA to diversify solutions generated by the genetic algorithm. CBGA clusters solutions with a bias towards solutions from different clusters, and then follows VEGA's selection approach. I apply VEGA, NPGA and CBGA to a vector bin-packing problem and to a real world school redistricting problem. I show that CBGA creates a set of solutions that are highquality, while maintaining diversity in both the evaluation space and the solution space.
Exploration of Fine-Grained Parallelism for Load Balancing Eager K-truss on GPU and CPU
Creators: name: Blanco, Mark
name: Low, Tze Meng
name: Kim, Kyungjoo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: In this work we present a performance exploration on Eager K-truss, a linear-algebraic formulation of the K-truss graph algorithm. We address performance issues related to load imbalance of parallel tasks in symmetric, triangular graphs by presenting a fine-grained parallel approach to executing the support computation. This approach also increases available parallelism, making it amenable to GPU execution. We demonstrate our fine-grained parallel approach using implementations in Kokkos and evaluate them on an Intel Skylake CPU and an Nvidia Tesla V100 GPU. Overall, we observe between a 1.261. 48x improvement on the CPU and a 9.97-16.92x improvement on the GPU due to our fine-grained parallel formulation.
description: 2019 IEEE High Performance Extreme Computing Conference (HPEC)
Intrinsic Ultracontractivity for Levy processes
Creators: name: Grzywny, Tomasz
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47D07, 60J25

description: We prove the intrinsic ultracontractivity for the semigroup generated by a large class of symmetric Levy processes such that the Levy measure satisfies some conditions in the neighborhood of 0, killed on exiting a bounded and connected Lipschitz domain.
description: 9 pages
Origin of Low Thermal Conductivity in Nuclear Fuels
Creators: name: Yin, Quan
name: Savrasov, Sergey Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using a novel many-body approach, we report lattice dynamical properties of UO2 and PuO2 and uncover various contributions to their thermal conductivities. Via calculated Grueneisen constants, we show that only longitudinal acoustic modes having large phonon group velocities are efficient heat carriers. Despite the fact that some optical modes also show their velocities which are extremely large, they do not participate in the heat transfer due to their unusual anharmonicity. Ways to improve thermal conductivity in these materials are discussed.
description: 4 pages, 3 figures, 1 table
Spirituality, Optimism and Self-Esteem: Pathways to Positive Change in a Women's Wellness Curriculum
Creators: name: Permut, Magda
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: Community
Positive Psychology
Spirituality
Wellness
Women

description: Research indicates that women use alternative health treatments more than men (National Health Statistics Report [NHSR], 2008). However, it is unclear how these types of interventions improve women's lives.  This research examined pathways to positive change among women in a holistic life improvement course offered by an alternative treatment setting, Shakti Rising.  Participants were 218 women assessed at baseline and completion of an 8-week intervention designed to increase spiritual involvement and personal awareness through meditation, group discussion, journaling and meaning-making activities. Multiple regression analyses were used to explore the mediational role that changes in optimism played in the relation between changes in spirituality and self-esteem.   Spirituality, optimism, and self-esteem increased significantly over the course of the 8-week intervention.  Increases in optimism fully mediated the relation between increases in spirituality and increases in self-esteem.  These results indicate that one possible pathway to improved self-esteem for women is via spirituality and optimism.
Human stress responses in office-like environments with wood furniture: Data processing and analysis
Creators: name: Burnard, Michael David
Publisher: name: Zenodo
Year: 2019
Subjects: r, Rstudio, analytics, cortisol, stress,

description: These files contain the data processing code (in R) used in an experiment comparing stress responses in different office-like environments. The experiment used salivary cortisol concentration as the primary indicator of stress and the analytical processing includes converting plate readings to cortisol concentrations, data wrangling, visualisation, basic assessment, and hypothesis testing. The related article is accepted in Building Research & Information in August 2019. The data cannot be shared as it contains sensitive, personal information and may be identifiable. There are two files: a .Rmd (R markdown) file, and a pdf produced from the .Rmd file.
Single star progenitors of long gamma-ray bursts I: Model grids and redshift dependent GRB rate
Creators: name: Yoon, S. -C.
name: Langer, N.
name: Norman, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present grids of massive star evolution models at four different metallicities (Z=0.004, 0.002, 0.001, 0.00001). The effects of rotation on the stellar structure and the transport of angular momentum and chemical elements through the Spruit-Tayler dynamo and rotationally induced instabilities are considered. After discussing uncertainties involved with the adopted physics, we elaborate the final fate of massive stars as a function of initial mass and spin rate, at each considered metallicity. In particular, we investigate for which initial conditions long gamma-ray bursts (GRBs) are expected to be produced in the frame of the collapsar model. Then, using an empirical spin distribution of young massive metal-poor stars and a specified metallicity-dependent history of star-formation, we compute the expected GRB rate as function of metallicity and redshift based on our stellar evolution models. The GRB production in our models is limited to metallicities of Z \lsim 0.004, with the consequence that about 50 % of all GRBs are predicted to be found at redshifts above z = 4, with most supernovae occurring at redshifts below z\simeq 2.2. The average GRB/SN ratio predicted by our model is about 1/200 globally, and 1/1250 at low redshift. Future strategies for testing the considered GRB progenitor scenario are briefly discussed.
description: 17 pages, 10 figures, 6 tables, accpeted by A&A, corrected, reference added
Resilient Identification of Distribution Network Topology
Creators: name: Jafarian, Mohammad
name: Soroudi, Alireza
name: Keane, Andrew
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Network topology identification (TI) is an essential function for distributed energy resources management systems (DERMS) to organize and operate widespread distributed energy resources (DERs). In this paper, discriminant analysis (DA) is deployed to develop a network TI function that relies only on the measurements available to DERMS. The propounded method is able to identify the network switching configuration, as well as the status of protective devices. Following, to improve the TI resiliency against the interruption of communication channels, a quadratic programming optimization approach is proposed to recover the missing signals. By deploying the propounded data recovery approach and Bayes' theorem together, a benchmark is developed afterward to identify anomalous measurements. This benchmark can make the TI function resilient against cyber-attacks. Having a low computational burden, this approach is fast-track and can be applied in real-time applications. Sensitivity analysis is performed to assess the contribution of different measurements and the impact of the system load type and loading level on the performance of the proposed approach.
The one-body and two-body density matrices of finite nuclei with an appropriate treatment of the center-of-mass motion
Creators: name: Shebeko, A.
name: Papakonstantinou, P.
name: Mavrommatis, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The one-body and two-body density matrices in coordinate space and their Fourier transforms in momentum space are studied for a nucleus (a nonrelativistic, self-bound finite system). Unlike the usual procedure, suitable for infinite or externally bound systems, they are determined as expectation values of appropriate intrinsic operators, dependent on the relative coordinates and momenta (Jacobi variables) and acting on intrinsic wavefunctions of nuclear states. Thus, translational invariance (TI) is respected. When handling such intrinsic quantities, we use an algebraic technique based upon the Cartesian representation, in which the coordinate and momentum operators are linear combinations of the creation and annihilation operators a^+ and a for oscillator quanta. Each of the relevant multiplicative operators can then be reduced to the form: one exponential of the set {a^+} times other exponential of the set {a}. In the course of such a normal-ordering procedure we offer a fresh look at the appearance of "Tassie-Barker" factors, and point out other model-independent results. The intrinsic wavefunction of the nucleus in its ground state is constructed from a nontranslationally-invariant (nTI) one via existing projection techniques. As an illustration, the one-body and two-body momentum distributions (MDs) for the 4He nucleus are calculated with the Slater determinant of the harmonic-oscillator model as the trial, nTI wavefunction. We find that the TI introduces important effects in the MDs.
description: 13 pages, incl. 3 figures - to appear in Eur. Phys. J. A
Clustering short status messages: A topic model based approach
Creators: name: Karandikar, Anand
Publisher: name: Maryland Shared Open Access Repository
Year: 2010
Subjects: clustering
social media
topic models
Twitter

description: Recently, there has been an exponential rise in the use of online social media systems like Twitter and Facebook. Even more usage has been observed during events related to natural disasters, political turmoil or other such crises. Tweets or status messages are short and may not carry enough contextual clues. Hence, applying traditional natural language processing algorithms on such data is challenging. Topic model is a popular method for modeling term frequency occurrences for documents in a given corpus. A topic basically consists of set of words that co-occur frequently. Unsupervised nature allows topic models to be trained easily on datasets meant for specific domains. We use the topic modeling feature of MALLET - a machine learning tool kit, to generate topic models from unlabelled data. We propose a way to cluster tweets by using the topic distributions in each tweet. We address the problem of determining which topic model is optimal for clustering tweets based on its clustering performances. We also demonstrate a use case wherein we cluster Twitter users based on the content they tweet. We back our research with experimental results and evaluations.
Students’ definitions of lexically ambiguous mathematical vocabulary
Creators: name: Wilder, Melinda G.
Publisher: name: University of British Columbia
Year: 2009

description: Fifty-five students in three high school geometry classes participated in a vocabulary survey asking them to write out, exemplify, and/or illustrate with drawings their definitions for fifteen mathematical vocabulary words: acute, area, coordinate, diagonal, difference, exponent, factor, irrational, mean, multiple, prime, product, reduce, square, and variable. All of these terms are characterized by lexical ambiguity, meaning that they have different meanings in different contexts. The students' responses were analyzed qualitatively, driven by the following research questions. First, in light of past studies in which findings seem consistently to reveal that a large portion of the participants have inadequate comprehension and/or inability to articulate their understanding of "basic" mathematical vocabulary, what are students' ideas about the meanings of certain vocabulary words? What strands or themes of meaning attributed to the words are evident from students' responses? Do students' responses seem to indicate that lexical ambiguity causes confusion for them in their definitions? A variety of ideas and interpretations emerged from the students responses for each of the words. Some of the students' ideas conformed to conventional mathematical definitions of the terms, but many were also characterized by vagueness or confusion. Interference from the lexical ambiguity of some of the words did appear in the data, particularly with the terms diagonal, irrational, and prime. A secondary purpose of this research was driven by the question: what forms of written expression do the students use to communicate their meanings for the vocabulary words posed to them? After a preliminary analysis of the data from the surveys through systematic theoretical sampling, nine students were selected to participate in follow-up interviews in which supplementary information was gathered. The interview method utilized stimulated recall, and the interviews were video-taped and transcribed. Because students construct their own individual meanings for mathematical terminology, their ideas about specific words do reflect a spectrum of interpretations. Through focused discussion and articulation of meaning where lexical ambiguity exists, students can more confidently enter into mathematical communication and discourse.
title: Изучение керамики русских городов и острогов Сибири: систематизация опыта
title: Pottery Study of the Russian Cities and Ostrogs of Siberia: System of Research’s Experience
Creators: name: Юдакова, Владислава Станиславовна
Publisher: name: Издательский центр СурГУ
Year: 2021

description: В работе приводится попытка систематизации опыта изучения керамических комплексов русских городов и острогов Сибири. При анализе ключевых вопросов, фигурирующих в исследованиях, выделяются как условно общепринятые принципы работы с материалом, так и специфические принципы и интерпретации.
description: The article considers systemization of Siberian pottery study of the Russian cities and ostrogs. Analysis of key issues of reviewed research highlights not only common principles of finding’s processing, but some peculiar principles and interpretations.
Should Head Start Centers Have Naps? An Experimental Study Examining the Effects of Nap Policy on Classroom Behavior in Preschool Children
Creators: name: Min, Chris B.
Publisher: name: Maryland Shared Open Access Repository
Year: 2012
Subjects: Child
Development
Naps
Pediatric
Preschool
Sleep

description: As preschool teachers and administrators strive to meet academic standards and make school schedules as efficient as possible, they differ in their opinions and approaches to daytime naps. To some extent these differences reflect a lack of authoritative data on how naps affect classroom and learning behaviors. The present study is the first known experimental study to directly examine the effects of eliminating naptime on preschool children's behavior. In general, results were mixed. Behavioral observations in the classroom indicated no significant differences in children's behavior and even suggested some improvement in behavior after naptime cessation. Teacher and parent reports, however, indicated that children's inattention increased after nap elimination. One explanation for disparate results may be that negative effects of nap cessation emerge later in the school day and/or at home, though one must consider study limitations before confidently reaching this conclusion. Exploratory analyses revealed that children slept less overall after nap elimination, though there was some evidence suggestive of increased nocturnal sleep efficiency. This efficiency may in part explain children's lack of differences in observed disruptive behavior and irritability after nap elimination. The present study highlights the need for future studies to examine the effects of naptime cessation utilizing objective behavioral assessments at school and at home as well as instruments to examine sleep architecture.
Total kinetic energy and mass yields from the fast neutron-induced fission of $^{239}$Pu
Creators: name: Chemey, Alexander
name: Pica, Ashley
name: Yao, Liangyu
name: Loveland, Walter
name: Lee, Hye Young
name: Kuvin, S. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The total kinetic energy (TKE) release in fission is an important observable, constituting over 80% of the energy released in fission (E$_{f}$ $\approx$ 200 MeV). While the TKE release in the $^{239}$Pu(n,f) reaction was previously measured up to 50 MeV incident neutron energy (E$_{n}$), there were features in TKE release at the highest values of E$_{n}$ that were puzzling. There was a marked flattening of TKE release from E$_{n}$ = 30 to 50 MeV, in disagreement with the clearly decreasing TKE observed from E$_{n}$ = 0.5 to 30 MeV. To verify and clarify this trend, TKE measurements at higher values of E$_n$ were made. We present absolute measurements of TKE release in $^{239}$Pu(n,f) from E$_{n}$ = 2.4 to 100 MeV. We used silicon PIN detectors to measure the fragment energies and deduce mass-yield curves using the 2E-method. We also discuss fission asymmetry and the relationships between approximate fission fragment mass and distortion.
description: 13 pages, Submitted to European Physical Journal A
ПСИХОЛОГИЧЕСКИЕ АСПЕКТЫ БЕРЕМЕННОСТИ И РОДОВ: ВЛИЯНИЕ ЭМОЦИОНАЛЬНОГО СОСТОЯНИЯ ЖЕНЩИНЫ НА ЗДОРОВЬЕ МАТЕРИ И РЕБЕНКА
Creators: name: Камалов, Анвар
name: Аликулов, Темир
name: Махмуродов, Рузмухаммад
Publisher: name: Zenodo
Year: 2024

description: Данный тезис посвящена психологическим аспектам беременности и родов, акцентируя внимание на влиянии эмоционального состояния женщины на здоровье как матери, так и ребенка. Анализируются основные факторы, способствующие стрессу и тревоге в период беременности, включая изменения в теле, социальные ожидания и финансовые проблемы. Рассматриваются возможные негативные последствия высокого уровня стресса на физическое и психологическое здоровье женщины, а также на эмоциональное и физическое развитие ребенка. Подчеркивается важность поддержки психоэмоционального состояния будущих матерей через консультации с психологами, группы поддержки и практики релаксации. Статья подводит итог тому, что эмоциональное здоровье женщины играет критическую роль в обеспечении благополучия как матери, так и ее ребенка, делая акцент на необходимости комплексного подхода к заботе о беременных женщинах.
Fidicina undetermined
Creators: name: De Santis, Cecilia L.
name: Medrano, María Celeste
name: Sanborn, Allen F.
name: Bolcatto, Pablo G.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadidae
Fidicina
Fidicina undetermined

description: Fidicina sp. Amyot & Seville, 1843 (Figura 1f)
· MFA-ZI- N°°° 2689. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 1ra/ II/46. 1♀.
· MFA-ZI- N°°° 2690. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, I/50. 1♀.
· MFA-ZI- N°°° 2691. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 1ra/ I/48. 1♀.
· MFA-ZI- N°°° 7094. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 7/I/54. 1♀.
· MFA-ZI- N°°° 7095. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, II/53. 1♀.
· MFA-ZI- N°°° 7098. Recreo (31°5’, 60°73’), Dpto. La Capital, Prov. Santa Fe, RA, 28/XII/58. 1♀.
· MFA-ZI- N°°° 7238. Km 60, Cerrito, La Gallareta (29°56’, 60°38’), Dpto. Vera, Prov. Santa Fe, RA, XII/55. 1♂.
· MFA-ZI- N°°° 7288. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 24/XII/59. 1♂.
· MFA-ZI- N°°° 8326. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 1ra/ I/48. 1♂ 1♀.
· MFA-ZI- N°°° 8327. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 2da/ XII/56. 1♂ 1♀.
description: Published as part of De Santis, Cecilia L., Medrano, María Celeste, Sanborn, Allen F. & Bolcatto, Pablo G., 2007, Cicádidos (Insecta: Hemiptera: Cicadidae) Del Museo Provincial De Ciencias Naturales " Florentino Ameghino " Santa Fe, Argentina, pp. 1-19 in Museo Provincial de Ciencias Naturales " Florentino Ameghino " Serie Catálogo 19 on pages 4-5, DOI: 10.5281/zenodo.8228308
Οικογενειακές ναυτιλιακές επιχειρήσεις και διαδοχή στην ηγεσία
Creators: name: Χρυσάνθη, Ελένη Ρηγίνα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2024
Subjects: subject: Ναυτιλία
subject: Ελληνόκτητος στόλος
subject: Εμπορική ναυτιλία
subject: Ναυτιλιακό συνάλλαγμα
subject: Ηγεσία

description: Το θέμα της παρούσας διπλωματικής είναι «Οικογενειακές Ναυτιλιακές Επιχειρήσεις Και Διαδοχή Στην Ηγεσία» και σκοπός της είναι να εξετάσει την διαδοχή στις Ελληνικές Ναυτιλιακές επιχειρήσεις της χώρας μας. Είναι αναντίρρητο γεγονός, πως η ναυτιλία υπήρξε και παραμένει η βαριά βιομηχανία στην χώρα μας ακόμη και σήμερα, συνεισφέροντας 8% στο ΑΕΠ. Παρά την έντονη διακύμανση των Ναυτιλιακών κύκλων στην βιομηχανία, οι Έλληνες εφοπλιστές έχουν καταφέρει να αποκτήσουν την φήμη των πιο επιτυχημένων πλοιοκτητών, διαθέτοντας το 21% του παγκόσμιου στόλου. Η Ναυτιλία συμβάλει με ποικίλους τρόπους στην ανάπτυξη της χώρας μας. Αρχικά, το Ναυτιλιακό συνάλλαγμα αποτελεί σημαντικό πυλώνα της Ελληνικής Οικονομίας καθώς αντισταθμίζει το ελλειμματικό ισοζύγιο πληρωμών. Επίσης, ο ναυτιλιακός κλάδος μειώνει σημαντικά τους δείκτες της ανεργίας καθώς απασχολεί προσωπικό τόσο στα καράβια – ναυτικούς, πλήρωμα κτλ-, όσο και στα γραφεία στην ξηρά. Η ελληνική Ναυτιλία είναι παραδοσιακά οικογενειακή. Δηλαδή, η οργάνωση της διαχείρισης των εταιρειών που την αποτελούν, βασίζεται στον ηγέτη-πατέρα, που συνήθως είναι και ο ιδρυτής της εταιρείας και εν συνεχεία, η ηγεσία κληρονομείται στα τέκνα είτε απευθείας, είτε μέσω κοινωνικών δεσμών.
Rare Earth Ions Doped Mixed Crystals for Fast Quantum Computers with Optical Frequency Qubits
Creators: name: Hizhnyakov, Vladimir
name: Boltrushko, Vadim
name: Kaasik, Helle
name: Orlovskii, Yurii
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The possibility of using mixed crystals highly doped with rare earth ions (REIs) as physical systems for creating fast quantum computers with a sampling time of nanoseconds is discussed. The electronic 4f states of rare earth ions with small values of the diagonal elements of the Judd-Ofelt matrix U(2) are proposed as optical frequency qubit levels. CNOT and other conditional gate operations are performed by exciting the rare earth ion into the 4f state with a large diagonal element of U(2), causing a Stark blockade. It is found that the main interaction responsible for this blockade is the quadrupole-quadrupole interaction. The large inhomogeneous broadening of the frequencies of the electronic transitions in mixed crystals and the weak interaction of 4f electrons with phonons make it possible to achieve a high computation rate and a long decoherence time of the qubits. An ensemble of closest REIs is described that can act as an OQC instance; the frequencies of the corresponding qubits can be found using the spectral hole burning method.
description: 15 pages, 3 tables, 2 figures
Features of interband absorption in narrow-gap semiconductors
Creators: name: Falkovsky, L. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: For semiconductors and semimetals possessing a narrow gap between bands with different parity, the dispersion of the dielectric function is explicitly evaluated in the infrared region. The imaginary part of the dielectric function has a plateau above the absorption threshold for the interband electron transitions. The real part of the dielectric function has a logarithmic singularity at the threshold. This results in the large contribution into the dielectric constant for pure semiconductors at low frequencies. For samples with degenerate carriers, the real part of the dielectric function is divergent at the absorption threshold. This divergence is smeared with the temperature or the collision rate.
description: 4 pages, 2 figures
Guyalna bonaerensis
Creators: name: De Santis, Cecilia L.
name: Medrano, María Celeste
name: Sanborn, Allen F.
name: Bolcatto, Pablo G.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadidae
Guyalna
Guyalna bonaerensis

description: Guyalna bonaerensis (Berg, 1879) (Figura 1g)
Esta especie, que alcanza unos 34.7 mm ± 1.8 mm para los machos y 33.1 mm ± 1.2 mm para las hembras, según mediciones de especies locales (De Santis, 2003), se caracteriza por presentar la mitad basal del vértex negro con dos manchas amarillas ubicadas entre los ojos y el rostro. A los lados de cada ojo aparece una raya transversal negra, el rostro alcanza las coxas posteriores. El pronoto, que es de color amarillo verdoso, se halla bordeado posteriormente por una delgada franja negra, la cual se ensancha en su parte media. El metanoto presenta dos manchas centrales semielíptica y dos laterales de igual color que se unen anteriormente a las centrales y posteriormente entre ellas. Urostergos de color oscuro. Ventralmente presenta una coloración ocrácea en general. Las tegminas son hialinas, con las nervaduras oscuras y manchadas en la primera y segunda transversales.
· MFA-ZI- N°°° 2692. Colastiné Sur (31°68’, 60°63’), Dpto. La Capital, Prov. Santa Fe, RA, 2da/ XII/50. 1♀.
· MFA-ZI- N°°° 2693. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 1ra/ I/48. 1♂.
· MFA-ZI- N°°° 4406. Vera (29°46’, 60°21’), Dpto. Vera, Prov. Santa Fe, RA, 27/XII/97, Del Barco. 1♂ 1♀.
· MFA-ZI- N°°° 7239. Arroyo Colorado, San José del Rincón (31°6’, 60°58’), Dpto. La Capital, Prov. Santa Fe, RA, II/58. 4♂, 5♀.
· MFA-ZI- N°°° 7240. Km 60, Cerrito, La Gallareta (29°56’, 60°38’), Dpto. Vera Prov. Santa Fe, RA, XII/55. 1♂.
· MFA-ZI- N°°° 7291. Laguna Paiva (31°31’, 60°65’), Dpto. La Capital, Prov. Santa Fe, RA, 20/XII/51. 2♂.
· MFA-ZI- N°°° 8321. (Laguna Guadalupe) Santa Fe (31°63’, 60°7’), Dpto. La Capital, Prov. Santa Fe, RA, 17/XII/51. 1 ejemplar en ecdisis.
· MFA-ZI- N°°° 8322. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 1ra/ I/51. 1♂, 5♀.
· MFA-ZI- N°°° 8323. Laguna Blanca, Balneario Ea. Asunción Maria (30°78’, 60°58’), Dpto. San Justo, Prov. Santa Fe, RA, 7/XII/86. 5♂, 1♀.
· MFA-ZI- N°°° 8324. La Falda (31°08’, 64°5’), Dpto. Punilla, Prov. Córdoba, RA, 1ra/ I/48. 4♂, 1♀.
description: Published as part of De Santis, Cecilia L., Medrano, María Celeste, Sanborn, Allen F. & Bolcatto, Pablo G., 2007, Cicádidos (Insecta: Hemiptera: Cicadidae) Del Museo Provincial De Ciencias Naturales " Florentino Ameghino " Santa Fe, Argentina, pp. 1-19 in Museo Provincial de Ciencias Naturales " Florentino Ameghino " Serie Catálogo 19 on pages 5-6, DOI: 10.5281/zenodo.8228308