cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Microwave power generated by a spin-torque oscillator in the presence of noise
Creators: name: Tiberkevich, Vasil
name: Kim, Joo-Von
name: Slavin, Andrei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: An expression for the microwave power generated by a spin-torque oscillator in the presence of thermal noise is derived. This expression, when used in a subcritical regime, demonstrates that generated power is determined by the noise level and provides a simple way to experimentally determine the threshold current for microwave generation. The same expression gives a good quantitative description of the experimentally measured dependence of the generated power on the bias current in a moderate super-critical range of bias current variation.
description: 3 pages, 2 figures
Surface waves in photonic crystal slabs
Creators: name: Wang, Bingnan
name: Dai, Weitao
name: Fang, Anan
name: Zhang, Lei
name: Tuttle, Gary
name: Koschny, Thomas
name: Soukoulis, Costas M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Photonic crystals with a finite size can support surface modes when appropriately terminated. We calculate the dispersion curves of surface modes for different terminations using the plane wave expansion method. These non-radiative surface modes can be excited with the help of attenuated total reflection technique. We did experiments and simulations to trace the surface band curve, both in good agreement with the numerical calculations.
Feshbach resonances in mixtures of ultracold $^6$Li and $^{87}$Rb gases
Creators: name: Deh, B.
name: Marzok, C.
name: Zimmermann, C.
name: Courteille, Ph. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We report on the observation of two Feshbach resonances in collisions between ultracold $^6$Li and $^{87}$Rb atoms in their respective hyperfine ground states $|F,m_F>=|1/2,1/2>$ and $|1,1>$. The resonances show up as trap losses for the $^6$Li cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at 1066.92 G opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow p-wave Feshbach resonance in collisions of $^6$Li atoms at 158.55 G in the presence of a dense $^{87}$Rb cloud. The effect of the $^{87}$Rb cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.
description: 4 pages, 3 figures
Non-abelian statistics from an abelian model
Creators: name: Wootton, James R.
name: Lahtinen, Ville
name: Wang, Zhenghan
name: Pachos, Jiannis K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is well known that the abelian $Z_2$ anyonic model (toric code) can be realized on a highly entangled two-dimensional spin lattice, where the anyons are quasiparticles located at the endpoints of string-like concatenations of Pauli operators. Here we show that the same entangled states of the same lattice are capable of supporting the non-abelian Ising model, where the concatenated operators are elements of the Clifford group. The Ising anyons are shown to be essentially superpositions of the abelian toric code anyons, reproducing the required fusion, braiding and statistical properties. We propose a string framing and ancillary qubits to implement the non-trivial chirality of this model.
description: 5 pages, 3 figures
Hartree-Fock ground state of the two-dimensional electron gas with Rashba spin-orbit interaction
Creators: name: Juri, L. O.
name: Tamborenea, P. I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We search for the uniform Hartree-Fock ground state of the two-dimensional electron gas formed in semiconductor heterostructures including the Rashba spin-orbit interaction. We identify two competing quantum phases: a ferromagnetic one with partial spin polarization in the perpendicular direction and a paramagnetic one with in-plane spin. We present a phase diagram in terms of the relative strengths of the Rashba to the Coulomb interaction and the electron density. We compare our theoretical description with existing experimental results obtained in GaAs-AlGaAs heterostructures.
description: 5 pages, 2 figures
MPEC 2023-Y80 : DAILY ORBIT UPDATE (2023 December 24)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
C3O: Collaborative Cluster Configuration Optimization for Distributed Data Processing in Public Clouds
Creators: name: Will, Jonathan
name: Thamsen, Lauritz
name: Scheinert, Dominik
name: Bader, Jonathan
name: Kao, Odej
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences
subject: C.2.4; I.2.8; I.2.6

description: Distributed dataflow systems enable data-parallel processing of large datasets on clusters. Public cloud providers offer a large variety and quantity of resources that can be used for such clusters. Yet, selecting appropriate cloud resources for dataflow jobs - that neither lead to bottlenecks nor to low resource utilization - is often challenging, even for expert users such as data engineers. We present C3O, a collaborative system for optimizing data processing cluster configurations in public clouds based on shared historical runtime data. The shared data is utilized for predicting the runtimes of data processing jobs on different possible cluster configurations, using specialized regression models. These models take the diverse execution contexts of different users into account and exhibit mean absolute errors below 3% in our experimental evaluation with 930 unique Spark jobs.
description: 10 pages, 5 figures, IEEE IC2E 2021. arXiv admin note: text overlap with arXiv:2011.07965
Field Flows of Dark Energy
Creators: name: Cahn, Robert N.
name: de Putter, Roland
name: Linder, Eric V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Scalar field dark energy evolving from a long radiation- or matter-dominated epoch has characteristic dynamics. While slow-roll approximations are invalid, a well defined field expansion captures the key aspects of the dark energy evolution during much of the matter-dominated epoch. Since this behavior is determined, it is not faithfully represented if priors for dynamical quantities are chosen at random. We demonstrate these features for both thawing and freezing fields, and for some modified gravity models, and unify several special cases in the literature.
description: 9 pages, 5 figures
Resonant and Near-Resonant Internal Wave Interactions
Creators: name: Lvov, Yuri V.
name: Polzin, Kurt L.
name: Yokoyama, Naoto
Publisher: name: arXiv
Year: 2007
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: We report evaluations of a resonant kinetic equation that suggest the slow time evolution of the Garrett and Munk spectrum is {\em not}, in fact, slow. Instead nonlinear transfers lead to evolution time scales that are smaller than one wave period at high vertical wavenumber. Such values of the transfer rates are inconsistent with conventional wisdom that regards the Garrett and Munk spectrum as an approximate stationary state and puts the self-consistency of a resonant kinetic equation at a serious risk. We explore possible reasons for and resolutions of this paradox. Inclusion of near-resonant interactions decreases the rate at which the spectrum evolves. This leads to improved self-consistency of the kinetic equation.
Charge-to-spin conversion of electron entanglement states and spin-interaction-free solid-state quantum computation
Creators: name: Zhang, Wei-Min
name: Wu, Yin-Zhong
name: Soo, Chopin
name: Feng, Mang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Without resorting to spin-spin coupling, we propose a scalable spin quantum computing scheme assisted with a semiconductor multiple-quantum-dot structure. The techniques of single electron transitions and the nanostructure of quantum-dot cellular automata (QCA) are used to generate charge entangled states of two electrons, which are then converted into spin entanglement states using single-spin rotations only. Deterministic two-qubit quantum gates are also manipulated using only single-spin rotations with the help of QCA. A single-shot readout of spin states can be carried out by coupling the multiple dot structure to a quantum point contact. As a result, deterministic spin-interaction-free quantum computing can be implemented in semiconductor nanostructure.
description: 5 pages, 4 figures, the revised version of quant-ph/0502002 for publication in Phys. Rev. B (to be appear on the issue of Oct. 15, 2007)
On Birational Transformations of Pairs in the Complex Plane
Creators: name: Blanc, Jérémy
name: Pan, Ivan
name: Vust, Thierry
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14E07; 14E05; 14H50; 14J26; 14J27

description: This article deals with the study of the birational transformations of the projective complex plane which leave invariant an irreducible algebraic curve. We try to describe the state of art and provide some new results on this subject.
description: 17 pages
Strong Uniqueness of the Ricci Flow
Creators: name: Chen, Bing-Long
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper, we derive some local a priori estimates for Ricci flow. This gives rise to some strong uniqueness theorems. As a corollary, let $g(t)$ be a smooth complete solution to the Ricci flow on $\mathbb{R}^{3}$, with the canonical Euclidean metric $E$ as initial data, then $g(t)$ is trivial, i.e. $g(t)\equiv E$.
description: 21 pages
A diffusion Monte Carlo study of small para-Hydrogen clusters
Creators: name: Guardiola, R.
name: Navarro, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: Ground state energies and chemical potentials of parahydrogen clusters are calculated from 3 to 40 molecules using the diffusion Monte Carlo technique with two different pH2-pH2 interactions. This calculation improves a previous one by the inclusion of three-body correlations in the importance sampling, by the time step adjustement and by a better estimation of the statistical errors. Apart from the cluster with 13 molecules, no other magic clusters are predicted, in contrast with path integral Monte Carlo results.
Screening of fluoroquinolone residues in imported and locally produced broiler chicken meat in Ibadan, Nigeria
Creators: name: Omotoso, Adekunbi Bridget
name: Omojola, Babatunde Andrew
Publisher: name: Department of Health, Animal Science and Food Safety (VESPA)
Year: 2014
Subjects: Fluoroquinolones; Residues; Chicken; Antibiotic resistance; Nigeria

description: The study was conducted to investigate residues of three fluoroquinolones (ciprofloxacin, norfloxacin and ofloxacin) in chicken meat sold in Ibadan, Nigeria. Two hundred and ninety-seven (297) samples of imported frozen (99) locally produced frozen (99) and freshly slaughtered (99) broiler chicken meat products were screened for antibiotic residues by microbiological assay using Escherichia coli as test organism. High performance liquid chromatography (HPLC) with ultraviolet (UV) detection was used for the determination of ciprofloxacin, norfloxacin and ofloxacin in the positive samples. One hundred and sixty (160) samples, constituting more than half (53.87%) of total sample size tested positive for Escherichia coli–sensitive antibiotic residues.  Positive samples were 54.55%, 56.57% and 52.53%, of freshly slaughtered, locally produced frozen chicken and imported frozen chicken meat respectively. Residues of investigated fluoroquinolones occurred more frequently in locally produced frozen chicken than in imported frozen chicken. The concentrations were however consistently higher in imported chicken. Among the three fluoroquinolones examined, the most abundant in imported frozen chicken was ciprofloxacin with mean 354.83±716.43µg/kg. Norfloxacin was the most abundant in freshly slaughtered and locally produced frozen chicken meat, having mean values of 107.70±138.36µg/kg and 120.96±162.83µg/kgrespectively while ofloxacin was the lowest in all categories. Most frozen chicken products imported into Nigeria at the time of this study contain higher levels of residual fluoroquinolones than the locally produced chicken. In order to tackle fluoroquinolone resistance from a food safety perspective, proper usage and monitoring of fluoroquinolones in meat animals should be encouraged in developing countries.
description: International Journal of Health, Animal Science and Food Safety, Vol 1, No 2 (2014)
A comparison of two conventional sedatives-diazepam and droperidol in combination with fentanyl in surgical patients
Creators: name: Battrum-Mounts, Deborah E.
Publisher: name: University of British Columbia
Year: 2010

description: One hundred patients who were to have cataract extraction and intraocular lens replacement carried out were randomly assigned to one of two drug groups. The purpose was to compare droperidol/ fentanyl and diazepam/fentanyl for the following effects: central nervous system depression, cardiovascular depression and ability to alleviate anxiety. Patients, psychology observes, and surgeons were not cognizant of others' opionons, nor of assignment of drug treatment group. Experimental design was a between group single treatment design. Psychological testing consisted of State-Trait Anxiety Inventory of Spielberger, Gorsuch and Lushene, and the Sensory/Affect ratio pain descriptors of Gracely, Dubner and McGrath. Opinion of ease of carrying out the surgical procedure was obtained from the surgeon, and opinion of the anaesthetic outcome was obtained from the anaesthetist. While both drug combinations proved to be successful for use as a sedative adjunct to local anaesthetic for this type of surgical procedure some differences were found. Patients found the diazepam/ fentanyl combination provided for a less intense overall procedure, and had little if any recall of the procedure. The surgeons also found the patients less restless in the diazepam/fentanyl group. Anaesthetists rated the level of sedation as equivalent for both groups and found there was not a significant difference between the amount of sedation they observed.
The short GRB070707 afterglow and its very faint host galaxy
Creators: name: Piranomonte, S.
name: D'Avanzo, P.
name: Covino, S.
name: Antonelli, L. A.
name: Beardmore, A. P.
name: Campana, S.
name: Chincarini, G.
name: D'Elia, V.
name: Della Valle, M.
name: Fiore, F.
name: Fugazza, D.
name: Guetta, D.
name: Guidorzi, C.
name: Israel, G. L.
name: Lazzati, D.
name: Malesani, D.
name: Parsons, A. M.
name: Perna, R.
name: Stella, L.
name: Tagliaferri, G.
name: Vergani, S. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results from an ESO/VLT campaign aimed at studying the afterglow properties of the short/hard gamma ray burst GRB 070707. Observations were carried out at ten different epochs from ~0.5 to ~80 days after the event. The optical flux decayed steeply with a power-law decay index greater than 3, later levelling off at R~27.3 mag; this is likely the emission level of the host galaxy, the faintest yet detected for a short GRB. Spectroscopic observations did not reveal any line features/edges that could unambiguously pinpoint the GRB redshift, but set a limit z < 3.6. In the range of allowed redshifts, the host has a low luminosity, comparable to that of long-duration GRBs. The existence of such faint host galaxies suggests caution when associating short GRBs with bright, offset galaxies, where the true host might just be too dim for detection. The steepness of the decay of the optical afterglow of GRB 070707 challenges external shock models for the optical afterglow of short/hard GRBs. We argue that this behaviour might results from prolonged activity of the central engine or require alternative scenarios.
description: 6 pages, 5 figures, accepted by A&A
Stiff equation of state for a holographic nuclear matter as instanton gas
Creators: name: Ghoroku, Kazuo
name: Kashiwa, Kouji
name: Nakano, Yoshimasa
name: Tachibana, Motoi
name: Toyoda, Fumihiko
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a holographic model, which was used to investigate the color superconducting phase of QCD, a dilute gas of instantons is introduced to study the nuclear matter. The free energy of the nuclear matter is computed as a function of the baryon chemical potential in the probe approximation. Then the equation of state is obtained at low temperature. Using the equation of state for the nuclear matter, the Tolman-Oppenheimer-Volkov equations for a cold compact star are solved. We find the mass-radius relation of the star, which is similar to the one for quark star. This similarity implies that the instanton gas given here is a kind of self-bound matter.
description: 19 pages, 3 figures
Large sets with small doubling modulo p are well covered by an arithmetic progression
Creators: name: Serra, Oriol
name: Zémor, Gilles
Publisher: name: arXiv
Year: 2008
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11P70

description: We prove that there is a small but fixed positive integer e such that for every prime larger than a fixed integer, every subset S of the integers modulo p which satisfies |2S|
description: 16 pages
Reinforced walks in two and three dimensions
Creators: name: Foster, Jacob G.
name: Grassberger, Peter
name: Paczuski, Maya
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In probability theory, reinforced walks are random walks on a lattice (or more generally a graph) that preferentially revisit neighboring `locations' (sites or bonds) that have been visited before. In this paper, we consider walks with one-step reinforcement, where one preferentially \emph{revisits} locations irrespective of the number of visits. Previous numerical simulations [A. Ordemann {\it et al.}, Phys. Rev. E {\bf 64}, 046117 (2001)] suggested that the site model on the lattice shows a phase transition at finite reinforcement between a random-walk like and a collapsed phase, in both 2 and 3 dimensions. The very different mathematical structure of bond and site models might also suggest different phenomenology (critical properties, etc.). We use high statistics simulations and heuristic arguments to suggest that site and bond reinforcement are in the same universality class, and that the purported phase transition in 2 dimensions actually occurs at zero coupling constant. We also show that a quasi-static approximation predicts the large time scaling of the end-to-end distance in the collapsed phase of both site and bond reinforcement models, in excellent agreement with simulation results.
description: 10 pages, including 18 figures
Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
Creators: name: Santana, Felipe A.
name: Beaton, Rachael L.
name: Covey, Kevin R.
name: O'Connell, Julia E.
name: Longa-Peña, Penélope
name: Cohen, Roger
name: Fernández-Trincado, José G.
name: Hayes, Christian R.
name: Zasowski, Gail
name: Sobeck, Jennifer S.
name: Majewski, Steven R.
name: Chojnowski, S. D.
name: De Lee, Nathan
name: Oelkers, Ryan J.
name: Stringfellow, Guy S.
name: Almeida, Andrés
name: Anguiano, Borja
name: Donor, John
name: Frinchaboy, Peter M.
name: Hasselquist, Sten
name: Johnson, Jennifer A.
name: Kollmeier, Juna A.
name: Nidever, David L.
name: Price-Whelan, Adrian. M.
name: Rojas-Arriagada, Alvaro
name: Schultheis, Mathias
name: Shetrone, Matthew
name: Simon, Joshua D.
name: Aerts, Conny
name: Borissova, Jura
name: Drout, Maria R.
name: Geisler, Doug
name: Law, C. Y.
name: Medina, Nicolás
name: Minniti, Dante
name: Monachesi, Antonela
name: Muñoz, Ricardo R.
name: Poleski, Radosław
name: Roman-Lopes, Alexandre
name: Schlaufman, Kevin C.
name: Stutz, Amelia M.
name: Teske, Johanna
name: Tkachenko, Andrew
name: Van Saders, Jennifer L.
name: Weinberger, Alycia
name: Zoccali, Manuela
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: APOGEE is a high-resolution (R sim 22,000), near-infrared, multi-epoch, spectroscopic survey of the Milky Way. The second generation of the APOGEE project, APOGEE-2, includes an expansion of the survey to the Southern Hemisphere called APOGEE-2S. This expansion enabled APOGEE to perform a fully panoramic mapping of all the main regions of the Milky Way; in particular, by operating in the H-band, APOGEE is uniquely able to probe the dust-hidden inner regions of the Milky Way that are best accessed from the Southern Hemisphere. In this paper we present the targeting strategy of APOGEE-2S, with special attention to documenting modifications to the original, previously published plan. The motivation for these changes is explained as well as an assessment of their effectiveness in achieving their intended scientific objective. In anticipation of this being the last paper detailing APOGEE targeting, we present an accounting of all such information complete through the end of the APOGEE-2S project; this includes several main survey programs dedicated to exploration of major stellar populations and regions of the Milky Way, as well as a full list of programs contributing to the APOGEE database through allocations of observing time by the Chilean National Time Allocation Committee (CNTAC) and the Carnegie Institution for Science (CIS). This work was presented along with a companion article, R. Beaton et al. (submitted; AAS29028), presenting the final target selection strategy adopted for APOGEE-2 in the Northern Hemisphere.
description: 43 pages; 5 figures; 6 Tables; 1 Appendix; Submitted to Journal and Under Review; Posting to accompany papers using the SDSS-IV/APOGEE-2 Data Release 17 scheduled for December 2021
High-temperature excess current and quantum suppression of electronic backscattering in a 1-D system
Creators: name: Sonne, Gustav
name: Gorelik, Leonid Y.
name: Shekhter, Robert I.
name: Jonson, Mats
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider the electronic current through a one-dimensional conductor in the ballistic transport regime and show that the quantum oscillations of a weakly pinned single scattering target results in a temperature- and bias-voltage independent excess current at large bias voltages. This is a genuine effect on transport that derives from an exponential reduction of electronic backscattering in the elastic channel due to quantum delocalization of the scatterer and from suppression of low-energy electron backscattering in the inelastic channels caused by the Pauli exclusion principle. We show that both the mass of the target and the frequency of its quantum vibrations can be measured by studying the differential conductance and the excess current. We apply our analysis to the particular case of a weakly pinned C60 molecule encapsulated by a single-wall carbon nanotube and find that the discussed phenomena are experimentally observable.
description: 4 pages, 4 figures
Nonsymmetric interpolation Macdonald polynomials and g_n basic hypergeometric series
Creators: name: Lascoux, Alain
name: Rains, Eric M.
name: Warnaar, S. Ole
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05E05; 33D52; 33D67

description: The Knop-Sahi interpolation Macdonald polynomials are inhomogeneous and nonsymmetric generalisations of the well-known Macdonald polynomials. In this paper we apply the interpolation Macdonald polynomials to study a new type of basic hypergeometric series of type g_n. Our main results include a new q-binomial theorem, new q-Gauss sum, and several transformation formulae for g_n series.
description: 30 pages
Dissipationless BCS Dynamics with Large Branch Imbalance
Creators: name: Nahum, A.
name: Bettelheim, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In many situations a BCS-type superconductor will develop an imbalance between the populations of the holelike and electronlike spectral branches. This imbalance suppresses the gap. It has been noted by Gal'perin et al. [Sov. Phys. JETP 54, 1126 (1981)] that at large imbalance, when the gap is substantially suppressed, an instability develops. The analytic treatment of the system beyond the instability point is complicated by the fact that the Boltzmann approach breaks down. We study the short-time behavior following the instability, in the collisionless regime, using methods developed by Yuzbashyan et al. [J. Phys. A 38, 7831 (2005); Phys. Rev. B 72, 220503(R) (2005)].
description: 12 pages, 3 figures
The distant galaxy cluster CL0016+16: X-ray analysis up to $R_{200}$
Creators: name: Solovyeva, L.
name: Anokhin, S.
name: Sauvageot, J. L.
name: Teyssier, R.
name: Neumann, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: To study the mass distribution of galaxy clusters up to their Virial radius, CL0016+16 seems to be a good candidate,since it is a bright massive cluster, previously considered as being dynamically relaxed. Using XMM-Newton observations of CL0016+16, we performed a careful X-ray background analysis, and we detected convincingly its X-ray emission up to $R_{200}$. We then studied its dynamical state with a detailed 2D temperature and surface brightness analysis of the inner part of the cluster. Using the assumption of both spherical symmetry and hydrostatic equilibrium (HE) we can determine the main cluster parameters: total mass, temperature profile, surface brightness profile and $β$-parameter. We also build a temperature map which clearly exhibits departure from spherical symmetry in the centre. To estimate the influence of these perturbations onto our total mass estimate, we also compute the total mass in the framework of the HE approach, but this time with various temperature profiles obtained in different directions. These various total mass estimates are consistent with each other. The temperature perturbations are clear signatures of ongoing merger activity. We also find significant residuals after subtracting the emissivity map by a 2D $β$-model fit. We conclude that, although CL0016+16 shows clear signs of merger activity and departure from spherical symmetry in the centre, its X-ray emissivity can be detected up to $R_{200}$ and the corresponding mass $M_{200}$ can be computed directly. It is therefore a good candidate to study cosmological scaling laws as predicted by the theory.
description: 11 pages, 17 figures, Accepted for publication in A&A
Properties of the Volume Operator in Loop Quantum Gravity I: Results
Creators: name: Brunnemann, Johannes
name: Rideout, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyze the spectral properties of the volume operator of Ashtekar and Lewandowski in Loop Quantum Gravity, which is the quantum analogue of the classical volume expression for regions in three dimensional Riemannian space. Our analysis considers for the first time generic graph vertices of valence greater than four. Here we find that the geometry of the underlying vertex characterizes the spectral properties of the volume operator, in particular the presence of a `volume gap' (a smallest non-zero eigenvalue in the spectrum) is found to depend on the vertex embedding. We compute the set of all non-spatially diffeomorphic non-coplanar vertex embeddings for vertices of valence 5--7, and argue that these sets can be used to label spatial diffeomorphism invariant states. We observe how gauge invariance connects vertex geometry and representation properties of the underlying gauge group in a natural way. Analytical results on the spectrum on 4-valent vertices are included, for which the presence of a volume gap is proved. This paper presents our main results; details are provided by a companion paper arXiv:0706.0382v1.
description: 36 pages, 7 figures, LaTeX. See also companion paper arXiv:0706.0382v1. Version as published in CQG in 2008. See arXiv:1003.2348 for important remarks regarding the sigma configurations. Subsequent computations have revealed some minor errors, which do not change the qualitative results but modify some of the numbers presented here
Second structure relation for $q$-semiclassical polynomials of the Hahn Tableau
Creators: name: Costas-Santos, R. S.
name: Marcellan, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42C05; 33C45

description: The q-classical orthogonal polynomials of the q-Hahn Tableau are characterized from their orthogonality condition and by a first and a second structure relation. Unfortunately, for the q-semiclassical orthogonal polynomials (a generalization of the classical ones) we find only in the literature the first structure relation. In this paper, a second structure relation is deduced. In particular, by means of a general finite-type relation between a q-semiclassical polynomial sequence and the sequence of its q-differences such a structure relation is obtained.
description: Keywords: Finite-type relation; Recurrence relation; q-Polynomials; q-Semiclassical polynomials
Semi-Classical Dynamics in Quantum Spin Systems
Creators: name: Froehlich, J.
name: Knowles, A.
name: Lenzmann, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35Q40 (Primary); 82C20, 81S99 (Secondary)

description: We consider two limiting regimes, the large-spin and the mean-field limit, for the dynamical evolution of quantum spin systems. We prove that, in these limits, the time evolution of a class of quantum spin systems is determined by a corresponding Hamiltonian dynamics of classical spins. This result can be viewed as a Egorov-type theorem. We extend our results to the thermodynamic limit of lattice spin systems and continuum domains of infinite size, and we study the time evolution of coherent spin states in these limiting regimes.
description: 16 pages
Properties of the Volume Operator in Loop Quantum Gravity II: Detailed Presentation
Creators: name: Brunnemann, Johannes
name: Rideout, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The properties of the Volume operator in Loop Quantum Gravity, as constructed by Ashtekar and Lewandowski, are analyzed for the first time at generic vertices of valence greater than four. The present analysis benefits from the general simplified formula for matrix elements of the Volume operator derived in gr-qc/0405060, making it feasible to implement it on a computer as a matrix which is then diagonalized numerically. The resulting eigenvalues serve as a database to investigate the spectral properties of the volume operator. Analytical results on the spectrum at 4-valent vertices are included. This is a companion paper to arXiv:0706.0469, providing details of the analysis presented there.
description: Companion to arXiv:0706.0469. Version as published in CQG in 2008. More compact presentation. Sign factor combinatorics now much better understood in context of oriented matroids, see arXiv:1003.2348, where also important remarks given regarding sigma configurations. Subsequent computations revealed some minor errors, which do not change qualitative results but modify some numbers presented here
Sarbanes-Oxley: What About all the Spreadsheets?
Creators: name: Panko, Raymond R.
name: Ordway, Nicholas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Software Engineering (cs.SE)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences
subject: J.1; H.4.1; K.6.4; D.2.5; D.2.9; K.8.1; K.3; K.6.3

description: The Sarbanes-Oxley Act of 2002 has finally forced corporations to examine the validity of their spreadsheets. They are beginning to understand the spreadsheet error literature, including what it tells them about the need for comprehensive spreadsheet testing. However, controlling for fraud will require a completely new set of capabilities, and a great deal of new research will be needed to develop fraud control capabilities. This paper discusses the riskiness of spreadsheets, which can now be quantified to a considerable degree. It then discusses how to use control frameworks to reduce the dangers created by spreadsheets. It focuses especially on testing, which appears to be the most crucial element in spreadsheet controls.
description: 45 pages, 7 figures
Evidence for a Turnover in the IMF of Low Mass Stars and Sub-stellar Objects: Analysis from an Ensemble of Young Clusters
Creators: name: Andersen, M.
name: Meyer, M. R.
name: Greissl, J.
name: Aversa, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a combined analysis of the low-mass Initial Mass Function (IMF) for seven star forming regions. We first demonstrate that the ratios of stars to brown dwarfs are consistent with a single underlying IMF. Assuming the underlying IMF is the same for all seven clusters and by combining the ratio of stars to brown dwarfs from each cluster we constrain the shape of the brown dwarf IMF and find it to be consistent with a log--normal IMF. This provides the strongest constraint yet that the sub-stellar IMF turns over (dN/dM M^(-alpha), alpha < 0).
description: 12 pages, 2 figures. Accepted in ApJ Letters Revised version have Column 7 modified from previous versions and gramatical errors have been corrected
A hydrodynamic scheme for two-component winds from hot stars
Creators: name: Votruba, V.
name: Feldmeier, A.
name: Kubát, J.
name: Rätzel, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have developed a time-dependent two-component hydrodynamics code to simulate radiatively-driven stellar winds from hot stars. We use a time-explicit van Leer scheme to solve the hydrodynamic equations of a two-component stellar wind. Dynamical friction due to Coulomb collisions between the passive bulk plasma and the line-scattering ions is treated by a time-implicit, semi-analytic method using a polynomial fit to the Chandrasekhar function. This gives stable results despite the stiffness of the problem. This method was applied to model stars with winds that are both poorly and well-coupled. While for the former case we reproduce the mCAK solution, for the latter case our solution leads to wind decoupling.
description: accepted to Astronomy and Astrophysics
A Simple Counterexample to Havil's "Reformulation" of the Riemann Hypothesis
Creators: name: Sondow, Jonathan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: General Mathematics (math.GM)
subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 11M26, 11M41

description: This is an elementary note. It corrects a mistake in the reformulation of the Riemann Hypothesis in J. Havil's book Gamma: Exploring Euler's Constant.
description: Expanded from 2 to 7 pages, new title, added: exposition of the RH and the alternating zeta function, proof that the corrected form of Havil's conjecture is a true reformulation of the RH, 4 references, and Acknowledgments
A ring laser gyroscope without lock-in phenomenon
Creators: name: Sunada, Satoshi
name: Tamura, Shuichi
name: Inagaki, Keizo
name: Harayama, Takahisa
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We theoretically and numerically study the effect of backscattering on rotating ring lasers by employing the Maxwell-Bloch equations. We show that frequency shifts due to the Sagnac effect incorporating the effect of backscattering can be observed without lock-in phenomenon, if the strength of backscattering originating in the bumps of the refractive index is larger than a certain value. It is also shown that the experimental results corresponding to the theoretical ones can actually be obtained by using a semiconductor fiber-optic ring laser gyroscope.
description: 9 pages, 6figures
Thermoacoustic tomography with detectors on an open curve: an efficient reconstruction algorithm
Creators: name: Kunyansky, Leonid
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 44A12; 92C55; 65R32

description: Practical applications of thermoacoustic tomography require numerical inversion of the spherical mean Radon transform with the centers of integration spheres occupying an open surface. Solution of this problem is needed (both in 2-D and 3-D) because frequently the region of interest cannot be completely surrounded by the detectors, as it happens, for example, in breast imaging. We present an efficient numerical algorithm for solving this problem in 2-D (similar methods are applicable in the 3-D case). Our method is based on the numerical approximation of plane waves by certain single layer potentials related to the acquisition geometry. After the densities of these potentials have been precomputed, each subsequent image reconstruction has the complexity of the regular filtration backprojection algorithm for the classical Radon transform. The peformance of the method is demonstrated in several numerical examples: one can see that the algorithm produces very accurate reconstructions if the data are accurate and sufficiently well sampled, on the other hand, it is sufficiently stable with respect to noise in the data.
An immunochemical and immunocytochemical study of the S-100b protein
Creators: name: Boyes, Barry Edward
Publisher: name: University of British Columbia
Year: 2010

description: This thesis describes an immunochemical and immunocytochemical study of the bovine brain S-lOOb protein. The two major forms of the S-100 isoproteins (S-lOOa and S-lOOb) were purified to apparent homogeneity from bovine brain. A polyclonal rabbit antiserum to the S-lOOb protein was prepared. The antiserum was characterized by solid phase immunochemical methods. The S-lOOb derived antiserum displayed a high degree of specificity for S-lOOb, but also crossreacted with the purified S-lOOa protein. The characteristics of the immunochemical reactivity of the antiserum towards these two isoproteins suggests the antiserum has specificity for the 6-subunit of the S-100 proteins. An immunohistochemical analysis of the cellular localization of S-lOOb immunoreactivity was undertaken. In the adult rat brain only the astrocytes were S-lOOb immunoreactive. This conclusion is supported by the morphological characteristics of the immunolabelled cells, as well as the observed co-localization of the immunoreactivities for S-lOOb and the Glial Fibrillary Acidic protein (GFAP), the major protein of the astrocyte intermediate filaments. These two antigens were always found to coexist. The immunolabelling of rat brain astrocytes by the S-lOOb derived antiserum stained the entire cell, yielding more complete morphological detail than is possible with the GFAP immunohistochemistry, which only labels the filamentous glial processes. It is concluded that S-lOOb immunohistochemistry could be of general utility in the investigation of astrocyte morphology. The present results also determine that the as yet unknown biological function(s) of the S-100 proteins must be related to a property of astrocytes.
Krzysztof Wachowski, Śląsk w dobie przedpiastowskiej. Studium archeologiczne
Creators: name: Kempke, Torsten
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1999

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 48 Nr. 3 (1999)
Systematic generation of entanglement measures for pure states
Creators: name: Sugita, Ayumu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a method to generate entanglement measures systematically by using the irreducible decomposition of some copies of a state under the local unitary (LU) transformations. It is applicable to general multipartite systems. We show that there are entanglement monotones corresponding to singlet representations of the LU group. They can be evaluated efficiently in an algebraic way, and experimentally measurable by local projective measurements of the copies of the state. Non-singlet representations are also shown to be useful to classify entanglement. Our method reproduces many well-known measures in a unified way, and produces also a lot of new ones.
description: 13 pages, no figure. Some group theoretical notations are modified
The Intrinsic Fundamental Group of a Linear Category
Creators: name: Cibils, Claude
name: Redondo, Maria Julia
name: Solotar, Andrea
Publisher: name: arXiv
Year: 2007
Subjects: subject: Rings and Algebras (math.RA)
subject: Category Theory (math.CT)
subject: K-Theory and Homology (math.KT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We provide an intrinsic definition of the fundamental group of a linear category over a ring as the automorphism group of the fibre functor on Galois coverings. If the universal covering exists, we prove that this group is isomorphic to the Galois group of the universal covering. The grading deduced from a Galois covering enables us to describe the canonical monomorphism from its automorphism group to the first Hochschild-Mitchell cohomology vector space.
description: Final version, to appear in Algebras and Representation Theory
Neutral mesons and disconnected diagrams in Twisted Mass QCD
Creators: name: ETM Collaboration
name: Michael, Chris
name: Urbach, Carsten
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We evaluate properties of neutral mesons in Nf=2 dynamical simulations of TMQCD at maximal twist. The pion is explored - establishing the size of the isospin splitting (an order a^2 effect). We investigate the eta' (the Nf=2 flavour singlet pseudoscalar meson) and neutral rho and scalar mesons. We show that disconnected diagrams can be evaluated very efficiently in TMQCD using variance reduction methods.
description: 7 pages, presented at Lattice 2007, Regensburg, Germany
Lorentz-symmetry violation in the electroweak sector: scattering processes in future $e^+ \, e^-$ colliders
Creators: name: De Fabritiis, P.
name: Malta, P. C.
name: Neves, M. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study CPT-odd non-minimal Lorentz-symmetry violating couplings in the electroweak sector modifying the interactions between leptons, gauge mediators and the Higgs boson. The tree-level (differential) cross sections for three important electroweak processes are discussed: $e^+ \, e^- \rightarrow Z \, H$, $e^+ \, e^- \rightarrow Z \, Z$ and $γ\, γ\rightarrow W^+ \, W^-$. By considering next-generation $e^+ \, e^-$ colliders reaching center-of-mass energies at the TeV scale and the estimated improved precision for the measurements of the respective cross sections, we are able to project upper bounds on the purely time-like background 4-vector as strict as $\lesssim 10^{-5} \, \mbox{GeV}^{-1}$, in agreement with previous work on similar Lorentz-violating couplings.
description: 15 pages, published in NPB
Strafverfolgung und Strafvollzug in Schleswig-Holstein 2013
Creators: name: (:Unkn) Unknown
Publisher: name: Universität Tübingen
Year: 2015
Subjects: subject: Strafverfolgung , Strafvollzug , Schleswig-Holstein
subject: 360

description: Mit der Strafverfolgungsstatistik werden die im Laufe eines Jahres auf Grund gerichtlicher Entscheidung rechtskräftig abgeurteilten und verurteilten Personen erfasst. Von den Amtsgerichten und Staatsanwaltschaften werden die Daten von Personen, die sich wegen Verbrechen oder Vergehen nach dem Strafgesetzbuch, nach anderen Bundesgesetzen oder nach Landesrecht einschließlich der Straftaten im Straßenverkehr vor Gericht verantworten mussten, in anonymisierter Form an das Statistische Landesamt weitergeleitet. Dabei werden Abgeurteilte und Verurteilte nach allgemeinem Strafrecht und nach Jugendstrafrecht unterschieden. Ordnungswidrigkeiten werden in dieser Statistik nicht erfasst. Die Statistik basiert auf Datensätzen und Zählkarten, die von den Gerichten für jede rechtskräftige Aburteilung erstellt werden. Bei der Aburteilung von Straftaten, die in Tateinheit oder Tatmehrheit begangen wurden, ist nur die Straftat erfasst, die nach dem Gesetz mit der schwersten Strafe bedroht ist. Werden mehrere Straftaten einer Person in mehreren Verfahren abgeurteilt, wird diese Person entsprechend mehrfach gezählt. In der Strafvollzugsstatistik werden zum Stichtag 31.03. jeden Jahres die Strafgefangenen und Sicherungsverwahrten nach ausgewählten demographischen und kriminologischen Merkmalen erfasst. Untersuchungs- Abschiebehäftlinge bleiben bei dieser Stichtageserhebung unberücksichtigt.
Time-Dependent Quantum Weak Values: Decay Law for Post-Selected States
Creators: name: Davies, P. C. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Weak measurements offer new insights into the behavior of quantum systems. Combined with post-selection, quantum mechanics predicts a range of new experimentally testable phenomena. In this paper I consider weak measurements performed on time-dependent pre- and post-selected ensembles, with emphasis on the decay of excited states. The results show that the standard exponential decay law is a limiting case of a more general law that depends on both the time of post-selection and the choice of final state. The generalized law is illustrated for two interesting choices of post-selection.
description: 7 pages, research paper, revised to incorporate some introductory background on the subject