cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Catching a bullet: direct evidence for the existence of dark matter
Creators: name: Clowe, D.
name: Randall, S. W.
name: Markevitch, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present X-ray and weak lensing observations of the merging cluster system 1E0657-556. Due to the recently collision of a merging subcluster with the main cluster, the X-ray plasma has been displaced from the cluster galaxies in both components. The weak lensing data shows that the lensing surface potential is in spatial agreement with the galaxies (~10% of the observed baryons) and not with the X-ray plasma (~90% of the observed baryons). We argue that this shows that regardless of the form of the gravitational force law at these large distances and low accelerations, these observations require that the majority of the mass of the system be some form of unseen matter.
description: 4 pages, 1 figure, to appear in the proceedings of the 2006 UCLA Dark Matter Symposium. Accompanying the paper is a partial data release at http://flamingos.astro.ufl.edu/1e0657/index.html
Some topics concerning the theory of singular dynamical systems
Creators: name: Roman-Roy, Narciso
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 37J05, 53D05, 53D22, 70H03, 70H05, 70H15, 70H45

description: Some subjects related to the geometric theory of singular dynamical systems are reviewed in this paper. In particular, the following two matters are considered: the theory of canonical transformations for presymplectic Hamiltonian systems, and the Lagrangian and Hamiltonian constraint algorithms and the time-evolution operator.
description: 12 pp. Talk given at the International Workshop on Groups, Geometry and Physics (in honour of the 60th birthday of Prof. J.F. Cari\~nena) Zaragoza (Spain), December 9 and 10, 2005
Characteristic varieties and constructible sheaves
Creators: name: Dimca, Alexandru
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 14C21, 14F99, 32S22

description: We explore the relation between the positive dimensional irreducible components of the characteristic varieties of rank one local systems on a smooth surface and the associated (rational or irrational) pencils. Our study, which may viewed as a continuation of D. Arapura's work, yields new geometric insight into the translated components relating them to the multiplicities of curves in the associated pencil, in a close analogy to the compact situation treated by A. Beauville. The new point of view is the key role played by the constructible sheaves naturally arising from local systems.
description: This new version brings in the orbifold fundamental groups and gives a simple, complete description of the finite group $T(f)$, see Theorem 5.3, which corrects a previous result by Serrano
Astrometry in Wide-field Surveys
Creators: name: Pal, Andras
name: Bakos, Gaspar
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a robust and fast algorithm for performing astrometry and source cross-identification on two dimensional point lists, such as between a catalogue and an astronomical image, or between two images. The method is based on minimal assumptions: the lists can be rotated, magnified and inverted with respect to each other in an arbitrary way. The algorithm is tailored to work efficiently on wide fields with large number of sources and significant non-linear distortions, as long as the distortions can be approximated with linear transformations locally, over the scale-length of the average distance between the points. The procedure is based on symmetric point matching in a newly defined continuous triangle space that consists of triangles generated by an extended Delaunay triangulation. Our software implementation performed at the 99.995% success rate on ~260,000 frames taken by the HATNet project.
description: Comments: accepted for publication in PASP (9 pages, 5 figures); see http://www.hatnet.hu/software (www.hatnet.hu/software) for software
BRST Symmetric Gaugeon Formalism for Higgs Model
Creators: name: Miura, Hikaru
name: Endo, Ryusuke
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We reinvestigate Yokoyama's gaugeon formalism for the spontaneously broken Abelian gauge theory. Within the framework of the covariant linear gauges, we give a general gauge-fixing Lagrangian which includes the gauge field, the Goldstone mode, the multiplier B-field and Yokoyama's gaugeon fields (as well as Faddeev-Popov ghosts). As special choices of the values of the gauge-fixing parameters, our theory includes the usual covariant gauges and R$_ξ$-like gauges. Although some of the gauge-fixing parameters can be shifted by the q-number gauge transformation, the $ξ$ parameter cannot be shifted in any of the R$_ξ$-like gauges.
description: PTPTeX, 19 pages, no figures, to be published in Prog. Theor. Phys. vol.117, No.4, April 2007
Magnetic field dependence of the superconducting gap node topology in non-centrosymmetric CePt$_3$Si
Creators: name: Eremin, I.
name: Annett, J. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The non-centrosymmetric superconductor CePt$_3$Si is believed to have a line node in the energy gap arising from coexistence of s-wave and p-wave pairing. We show that a weak c-axis magnetic field will remove this line node, since it has no topological stability against time-reversal symmetry breaking perturbations. Conversely a field in the $a-b$ plane is shown to remove the line node on some regions of the Fermi surface, while bifurcating the line node in other directions, resulting in two 'boomerang'-like shapes. These line node topological changes are predicted to be observable experimentally in the low temperature heat capacity.
description: 4 pages, 3 figures
Contribution à l'etude des binaires des types F, G, K, M IX. HD 191588, nouvelle binaire spectroscopique à raies simples de type RS Cvn, systeme triple
Creators: name: Griffin, Roger R. F.
name: Ginestet, Nicole
name: Carquillat, Jean-Michel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: An accident of misidentification has brought to light the interesting system HD 191588, a new RS CVn-type spectroscopic binary. A radial-velocity study of the primary star, the only seen component, carried out at the Observatoire de Haute-Provence with the Coravel instrument and subsequently at the Cambridge Observatories with a similar one, reveals two orbital motions: a short-period orbit (60 days) and a long-period one (about 4.5 years), so this star is a triple system. The following orbital elements are obtained: (1) for the long-period orbit P = 1667+/-17 days, T = 50901 +/-67 MJD, Gamma = +2.09 +/-0.07 km/s, K = 2.51 +/-0.13 km/s, e = 0.18 +/-0.04, omega = 228deg +/- 14 deg, a1 sin i = 56.7 +/- 3.0 Gm, f(m) = 0.0026 +/-0.0004 M_sun, and (2) for the short-period orbit P = 60.0269 +/-0.0016 days, T = 50482.6 +/-3.3 MJD, gamma is var., K = 24.03 +/- 0.09 km/s, e = 0.012 +/-0.004, omega = 233 deg +/-19deg, a1 sin i = 19.83 +/-0.07 Gm, f(m) = 0.0865 +/-0.0009 M_sun. From near-infrared observations we refine the classification of the primary component and we found a spectral type of K2.5 III, and a spectrum obtained in the blue--near-UV spectral region reveals strong H and K emission lines of Ca II. The unseen secondary should be a solar-type star (F or G V); the minimum mass of the third body is that of a dwarf M star. Probably, the primary component rotates in synchronism with the orbital motion in the inner orbit; a model, based upon that hypothesis, is proposed for the system, and finally the connection of the inner binary to the long-period RS CVn group (Hall 1976) is discussed.
description: 8 pages
The experiences of nursing students caring for persons with acquired immunodeficiency syndrome (AIDS)
Creators: name: Negrin, Kelly Ann
Publisher: name: University of British Columbia
Year: 2009

description: Acquired immunodeficiency syndrome (AIDS) is a health problem of epidemic proportion. Of all health professionals, nurses provide the majority of care to persons with AIDS (PWAs). Studies have documented that nurses hold negative attitudes toward PWAs which affect the care afforded this client population. Several studies, mostly quantitative in nature, have addressed nursing students1 attitudes toward PWAs, the findings of which indicate similar attitudes to those of nurses. Since nursing students, as students and as future nurses, will be expected to provide care to the increasing number of PWAs, a need exists for further research. Moreover, since the potential exists for inductive methods to more fully illuminate phenomena that may otherwise be difficult to convey using quantitative methods, a qualitative study was conducted of nursing students' experiences caring for PWAs. Eight students from the University of British Columbia/Vancouver General Hospital (UBC/VGH) Nursing Program, enrolled in the second through fourth years of the program, and who had cared for at least one PWAs within their course of study, participated. Direction for analysis of the audiotaped, unstructured interviews was taken from phenomenological methods of data analysis. Data analysis revealed that concern for personal safety was a pervasive and enduring theme throughout nursing students1 experiences caring for PWAs. Students experienced varying levels of concern for personal safety, from a heightened awareness of their clients' body fluids, to students being very scared that caring for their clients could cause their own deaths. Students described how concern for personal safety, for them, was unique to caring for PWAs due to the combined effect of the contagious, incurable, and fatal properties of AIDS. Students employed a number of mental activities, termed processing, to appraise and cope with their experiences caring for PWAs. Students also utilized a variety of deliberate and observable behaviors, termed managing, to cope with caring for this client population. The findings from this study have implications for nursing practice, education, administration, and research.
Profiling the methylome targets of histone lysine methyltransferases
Creators: name: Addison, Katie
Publisher: name: Imperial College London
Year: 2018

description: It is widely understood that dysregulation of epigenetic events such as post-translational modifications (PTMs) of histone proteins, are associated with a plethora of diseases, such as cancer. A prevalent and regularly studied PTM is the methylation of lysine residues on histones, mediated by the family of enzymes – histone lysine methyltransferases (HKMTs). However, to date there are considerable challenges in defining unambiguously the methylation targets of a single HKMT. The major reasons for this are: 1) there is considerable redundancy in histone methylation and multiple HKMTs can ‘write’ the same target methylation modification, 2) HKMTs also often have many non-histone substrates. The majority of HKMTs contain the SET (Su(var)3-9, Enhancer-of-zeste and Trithorax) binding domain which binds the co-factor S-adenosyl methionine (SAM) enabling the transfer of the methyl donor group to the intended substrate. Through computational studies, the group has located an endogenous ‘hole’ in the SET binding domain of SETD7 making it structurally different to other HKMTs (e.g. G9a). The work presented here shows the synthesis of a small library of SAM analogues to be utilised by SETD7. The analogues have various groups appended at the C-2 position of the adenine ring to compliment the endogenous ‘hole’ in SETD7. Additionally, these cofactors include an isotopically labelled CD3 reporter group so newly deposited ‘heavy’ methyl marks can be readily distinguished from endogenous methylation using LC-MS/MS analysis. Initial in vitro and in vivo studies have been performed to demonstrate the validity of this approach for histone targets with the intention of extending to a library of non-histone targets.
DOA Estimation with Non-Uniform Linear Arrays: A Phase-Difference Projection Approach
Creators: name: Chen, Hui
name: Ballal, Tarig
name: Al-Naffouri, Tareq Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Phase wrapping is a major problem in direction-of-arrival (DOA) estimation using phase-difference observations. For a sensor pair with an inter-sensor spacing greater than half of the wavelength ($λ/2$) of the signal, phase wrapping occurs at certain DOA angles leading to phase-difference ambiguities. Existing phase unwrapping methods exploit either frequency or spatial diversity. These techniques work by imposing restrictions on the utilized frequencies or the receiver array geometry. In addition to sensitivity to noise and calibration errors, these methods may also have high computational complexity. We propose a grid-less \emph{phase-difference projection} (PDP) DOA algorithm to overcome these issues. The concept of \emph{wrapped phased-difference pattern} (WPDP) is introduced, which allows the proposed algorithm to compute most of the parameters required for DOA estimation in an offline manner, hence resulting in a superior computational speed in realtime. Simulation results demonstrate the excellent performance of the proposed algorithm, both in terms of accuracy and speed.
description: 5 pages, 3 figures
Electromagnetic response and effective gauge theory of graphene in a magnetic field
Creators: name: Shizuya, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electromagnetic response of graphene in a magnetic field is studied, with particular emphasis on the quantum features of its ground state (vacuum). The graphene vacuum, unlike in conventional quantum Hall systems, is a dielectric medium and carries an appreciable amount of electric and magnetic susceptibilities. The dielectric effect grows rapidly with increasing filling factor nu in such a way that reflects the 'relativistic' Landau-level characteristics of graphene as well as its valley and spin degeneracy. A close look into the dielectric function also reveals that the Coulomb interaction is efficiently screened on the scale of the magnetic length, leading to a prominent reduction of the exciton spectra in graphene. In addition, an effective gauge theory of graphene is constructed out of the response. It is pointed out thereby that the electric susceptibility is generally expressed as a ratio of the Hall conductance to the Landau gap.
description: 9 pages, 3 figures, revtex, corrected typos
On the definition of the Kobayashi-Buseman pseudometric
Creators: name: Nikolov, Nikolai
name: Pflug, Peter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 32F45

description: We prove that the $(2n-1)$-th Kobayashi pseudometric of any domain $D\subset\Bbb C^n$ coincides with the Kobayashi--Buseman pseudometric of $D,$ and that $2n-1$ is the optimal number, in general.
A chaotic representation property of the multidimensional Dunkl processes
Creators: name: Gallardo, Léonard
name: Yor, Marc
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G17, 60G44, 60J25, 60J60, 60J65, 60J75, 60H05 (Primary)

description: Dunkl processes are martingales as well as càdlàg homogeneous Markov processes taking values in $\mathbb{R}^d$ and they are naturally associated with a root system. In this paper we study the jumps of these processes, we describe precisely their martingale decompositions into continuous and purely discontinuous parts and we obtain a Wiener chaos decomposition of the corresponding $L^2$ spaces of these processes in terms of adequate mixed multiple stochastic integrals.
description: Published at http://dx.doi.org/10.1214/009117906000000133 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Sasakian structures on CR-manifolds
Creators: name: Ornea, Liviu
name: Verbitsky, Misha
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: A contact manifold $M$ can be defined as a quotient of a symplectic manifold $X$ by a proper, free action of $\R^{>0}$, with the symplectic form homogeneous of degree 2. If $X$ is, in addition, Kaehler, and its metric is also homogeneous of degree 2, $M$ is called Sasakian. A Sasakian manifold is realized naturally as a level set of a Kaehler potential on a complex manifold, hence it is equipped with a pseudoconvex CR-structure. We show that any Sasakian manifold $M$ is CR-diffeomorphic to an $S^1$-bundle of unit vectors in a positive line bundle on a projective Kähler orbifold. This induces an embedding from $M$ to an algebraic cone $C$. We show that this embedding is uniquely defined by the CR-structure. Additionally, we classify the Sasakian metrics on an odd-dimensional sphere equipped with a standard CR-structure.
description: 23 pages, v. 1.1: replaced the abstract, no change in the paper itself
Low-frequency modes in the Raman spectrum of sp-sp2 nanostructured carbon
Creators: name: Casari, C. S.
name: Bassi, A. Li
name: Baserga, A.
name: Ravagnan, L.
name: Piseri, P.
name: Lenardi, C.
name: Tommasini, M.
name: Milani, A.
name: Fazzi, D.
name: Bottani, C. E.
name: Milani, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A novel form of amorphous carbon with sp-sp2 hybridization has been recently produced by supersonic cluster beam deposition showing the presence in the film of both polyynic and cumulenic species [L. Ravagnan et al. Phys. Rev. Lett. 98, 216103 (2007)]. Here we present a in situ Raman characterization of the low frequency vibrational region (400-800 cm-1) of sp-sp2 films at different temperatures. We report the presence of two peaks at 450 cm-1 and 720 cm-1. The lower frequency peak shows an evolution with the variation of the sp content and it can be attributed, with the support of density functional theory (DFT) simulations, to bending modes of sp linear structures. The peak at 720 cm-1 does not vary with the sp content and it can be attributed to a feature in the vibrational density of states activated by the disorder of the sp2 phase.
description: 15 pages, 5 figures, 1 table
Hyperfast pulsars as the remnants of massive stars ejected from young star clusters
Creators: name: Gvaramadze, V. V.
name: Gualandris, A.
name: Zwart, S. Portegies
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent proper motion and parallax measurements for the pulsar PSR B1508+55 indicate a transverse velocity of ~1100 km/s, which exceeds earlier measurements for any neutron star. The spin-down characteristics of PSR B1508+55 are typical for a non-recycled pulsar, which implies that the velocity of the pulsar cannot have originated from the second supernova disruption of a massive binary system. The high velocity of PSR B1508+55 can be accounted for by assuming that it received a kick at birth or that the neutron star was accelerated after its formation in the supernova explosion. We propose an explanation for the origin of hyperfast neutron stars based on the hypothesis that they could be the remnants of a symmetric supernova explosion of a high-velocity massive star which attained its peculiar velocity (similar to that of the pulsar) in the course of a strong dynamical three- or four-body encounter in the core of dense young star cluster. To check this hypothesis we investigated three dynamical processes involving close encounters between: (i) two hard massive binaries, (ii) a hard binary and an intermediate-mass black hole, and (iii) a single star and a hard binary intermediate-mass black hole. We find that main-sequence O-type stars cannot be ejected from young massive star clusters with peculiar velocities high enough to explain the origin of hyperfast neutron stars, but lower mass main-sequence stars or the stripped helium cores of massive stars could be accelerated to hypervelocities. Our explanation for the origin of hyperfast pulsars requires a very dense stellar environment of the order of 10^6 -10^7 stars pc^{-3}. Although such high densities may exist during the core collapse of young massive star clusters, we caution that they have never been observed.
description: 11 pages, 6 figures, 1 table, accepted to MNRAS
Stochastic theory of spin-transfer oscillator linewidths
Creators: name: Kim, Joo-Von
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a stochastic theory of linewidths for magnetization oscillations in spin-valve structures driven by spin-polarized currents. Starting from a nonlinear oscillator model derived from spin-wave theory, we derive Langevin equations for amplitude and phase fluctuations due to the presence of thermal noise. We find that the spectral linewidths are inversely proportional to the spin-wave intensities with a lower bound that is determined purely by modulations in the oscillation frequencies. Reasonable quantitative agreement with recent experimental results from spin-valve nanopillars is demonstrated.
description: Submitted to Physical Review B
Feature Selection for Multivariate Time Series via Network Pruning
Creators: name: Gu, Kang
name: Vosoughi, Soroush
name: Prioleau, Temiloluwa
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: In recent years, there has been an ever increasing amount of multivariate time series (MTS) data in various domains, typically generated by a large family of sensors such as wearable devices. This has led to the development of novel learning methods on MTS data, with deep learning models dominating the most recent advancements. Prior literature has primarily focused on designing new network architectures for modeling temporal dependencies within MTS. However, a less studied challenge is associated with high dimensionality of MTS data. In this paper, we propose a novel neural component, namely Neural Feature Selector (NFS), as an end-2-end solution for feature selection in MTS data. Specifically, NFS is based on decomposed convolution design and includes two modules: firstly each feature stream (a stream corresponds to an univariate series of MTS) within MTS is processed by a temporal CNN independently; then an aggregating CNN combines the processed streams to produce input for other downstream networks. We evaluated the proposed NFS model on four real-world MTS datasets and found that it achieves comparable results with state-of-the-art methods while providing the benefit of feature selection. Our paper also highlights the robustness and effectiveness of feature selection with NFS compared to using recent autoencoder-based methods.
description: In ICDM 2021 Workshop on Systematic Feature Engineering for Time-Series Data Mining (SFE-TSDM)
Theoretical study of isolated dangling bonds, dangling bond wires and dangling bond clusters on H:Si(100)-(2$\times$1) surface
Creators: name: Raza, Hassan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically study the electronic band structure of isolated unpaired and paired dangling bonds (DB), DB wires and DB clusters on H:Si(100)-(2$\times$1) surface using Extended Hückel Theory (EHT) and report their effect on the Si band gap. An isolated unpaired DB introduces a near-midgap state, whereas a paired DB leads to $π$ and $π^*$ states, similar to those introduced by an unpassivated asymmetric dimer (AD) Si(100)-(2$\times$1) surface. Such induced states have very small dispersion due to their isolation from the other states, which reside in conduction and valence band. On the other hand, the surface state induced due to an unpaired DB wire in the direction along the dimer row (referred to as $[\bar{1}10]$), has large dispersion due to the strong coupling between the adjacent DBs, being 3.84$Å$ apart. However, in the direction perpendicular to the dimer row (referred to as [110]), due to the reduced coupling between the DBs being 7.68$Å$ apart, the dispersion in the surface state is similar to that of an isolated unpaired DB. Apart from this, a paired DB wire in $[\bar{1}10]$ direction introduces $π$ and $π^*$ states similar to those of an AD surface and a paired DB wire in [110] direction exhibits surface states similar to those of an isolated paired DB, as expected. Besides this, we report the electronic structure of different DB clusters, which exhibit states inside the band gap that can be interpreted as superpositions of states due to unpaired and paired DBs.
description: 7 pages, 10 figure, 1 table
Determining quark and lepton mass matrices by a geometrical interpretation
Creators: name: Guo, Zhi-Qiang
name: Ma, Bo-Qiang
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: By designating one eigenvector of the mass matrix, one can reduce the free parameters in the mass matrix effectively. Applying this method to the quark mass matrix and to the lepton mass matrix, we find that this method is consistent with available experimental data. This approach may provide some hints for constructing theoretical models. Especially, in the lepton sector, the Koide's mass relation is connected to the element of the tribimaximal matrix through Foot's geometrical interpretation. In the quark sector, we suggest another mass formula and the same procedure also applies.
description: 13 pages, to appear in Phys.Lett.B
Hydroxyl vacancies in single-walled aluminosilicate and aluminogermanate nanotubes
Creators: name: Teobaldi, G.
name: Beglitis, N. S.
name: Fisher, A. J.
name: Zerbetto, F.
name: Hofer, W. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We report the first theoretical study of hydroxyl vacancies in aluminosilicate and aluminogermanate single-walled metal-oxide nanotubes. The defects are modeled on both sides of the tube walls and lead to occupied and empty states in the band gap which are highly localized both in energy and in real space. We find different magnetization states depending on both the chemical composition and the specific side with respect to the tube cavity. The defect-induced perturbations to the pristine electronic structure are related to the electrostatic polarization across the tube walls and the ensuing change in Brønsted acid-base reactivity. Finally, the capacity to counterbalance local charge accumulations, a characteristic feature of these systems, is discussed in view of their potential application as insulating coatings for one-dimensional conducting nanodevices.
description: manuscript: 4 pages, 4 figures
MPEC 2024-T126 : 2024 TQ2
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TQ2

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.
Quenching of the Haldane gap in LiVSi2O6 and related compounds
Creators: name: Pedrini, B.
name: Wessel, S.
name: Gavilano, J. L.
name: Ott, H. R.
name: Kazakov, S. M.
name: Karpinski, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report results of susceptibility chi and 7Li NMR measurements on LiVSi2O6. The temperature dependence of the magnetic susceptibility chi(T) exhibits a broad maximum, typical for low-dimensional magnetic systems. Quantitatively it is in agreement with the expectation for an S=1 spin chain, represented by the structural arrangement of V ions. The NMR results indicate antiferromagnetic ordering below T_N=24 K. The intra- and interchain coupling J and J_p for LiVSi2O6, and also for its sister compounds LiVGe2O6, NaVSi2O6 and NaVGe2O6, are obtained via a modified random phase approximation which takes into account results of quantum Monte Carlo calculations. While J_p is almost constant across the series, J varies by a factor of 5, decreasing with increasing lattice constant along the chain direction. The comparison between experimental and theoretical susceptibility data suggests the presence of an easy-axis magnetic anisotropy, which explains the formation of an energy gap in the magnetic excitation spectrum below T_N, indicated by the variation of the NMR spin-lattice relaxation rate at T << T_N.
description: 11 pages, 12 Figures
Instability of cosmic Yang-Mills fields
Creators: name: Kumar, Kaushlendra
name: Lechtenfeld, Olaf
name: Costa, Gabriel Picanço
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: There exists a small family of analytic SO(4)-invariant but time-dependent SU(2) Yang-Mills solutions in any conformally flat four-dimensional spacetime. These might play a role in early-universe cosmology for stabilizing the symmetric Higgs vacuum. We analyze the linear stability of these "cosmic gauge fields" against general gauge-field perturbations while keeping the metric frozen, by diagonalizing the (time-dependent) Yang-Mills fluctuation operator around them and applying Floquet theory to its eigenfrequencies and normal modes. Except for the exactly solvable SO(4) singlet perturbation, which is found to be marginally stable linearly but bounded nonlinearly, generic normal modes often grow exponentially due to resonance effects. Even at very high energies, all cosmic Yang-Mills backgrounds are rendered linearly unstable.
description: 1+24 pages, 34 diagrams in 13 figures; v2: introduction and conclusions extended by physical motivation, two references added, matches published version
Γραφική ανάλυση του linked open data cloud:
Creators: name: Ραπτοτάσιου, Ευγενία Ευθυμίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: θεωρία γράφων
ανάλυση δικτύων
διασυνδεδεμένα δεδομένα
graph
network analysis
linked data

description: Σκοπός της παρούσας εργασίας είναι η συλλογή και καταγραφή των διασυνδεδεμένων δεδομένων που αποτελούν μέρος του linked open data cloud καθώς και των συνδέσεων (interlinks) αυτών προκειμένου να αναπαραστήσουμε το δίκτυο. Στην πρώτη ενότητα, παρουσιάζονται τα αποτελέσματα της ανάλυσης για προηγούμενα έτη, συγκεκριμένα γίνεται σύγκριση του δικτύου όπως αποτυπώθηκε το 2009 και το 2011. Στην δεύτερη ενότητα, δίνεται μεγαλύτερη έμφαση στην τρέχουσα κατάσταση του δικτύου, στην προσπάθεια μας να αποτυπώσουμε την εξέλιξη του linked data open cloud. Εστιάζουμε, κάνοντας χρήση του λογισμικού R και παραθέτοντας τον κώδικα που συγγράφηκε, σε μια πιο λεπτομερή ανάλυση σε σχέση με προηγούμενες χρονικά εκδόσεις.
description: The purpose of this work is to collect and record the linked data which are part of the linked open data cloud and their connections (interlinks) in order to represent the network. In the first section we present the results of analysis for earlier years, specifically we compare the network as it was reflected in 2009 and 2011. In the second section, we focus more on the current status of the network, in our effort to understand the evolution of linked data open cloud. Using the software R and quoting the code, we present a more detailed analysis than in previous versions.
The Multiple Timescales of Optical Variability of the Blazar 3C 279 During the 2001-2002 Outburst
Creators: name: Kartaltepe, Jeyhan S.
name: Balonek, Thomas J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: During 2001-2002 the optically violent variable (OVV) blazar 3C 279 un- derwent the most intense outburst seen during the entire fourteen year history that this quasar has been studied at Colgate University's Foggy Bottom Obser- vatory (FBO). This study concentrates on ~1600 R-filter images taken during this period of activity. This data set includes twenty-nine nights of microvari- ability coverage. The outburst began in March 2001, after 3C 279 had faded to its faintest level, R = 15.5, in four years. The source reached its brightest level, R = 12.5, in the fourteen years of our study in August 2001, at which time it became unobservable due to its proximity to the Sun. Upon becoming observable again in mid-December 2001, 3C 279 fluctuated between R = 13.9 and R = 14.7, until a dramatic decrease in flux level in June-July 2002 brought the source back down to a level comparable to its pre-outburst state. The source exhibited numerous week-long flares of approximately one magnitude during the outburst period. Superposed on these flares were night-to-night variations of up to one half magnitude and intra-night microvariability of up to 0.13 magnitude in three hours. We use visual inspection of the light curve as well as numerical timescale analysis tools (the autocorrelation function, the structure function, and the power spectrum) to characterize the multiple timescales of variability ranging from 1.5 years to several hours.
description: 44 pages, 21 figures, 3 tables Accepted for publication in the Astronomical Journal
Additional file 1 of Bio-nanocomplexes with autonomous O2 generation efficiently inhibit triple negative breast cancer through enhanced chemo-PDT
Creators: name: Zeng, Zhihong
name: Wang, Zhou
name: Chen, Simin
name: Xiao, Chang
name: Liu, Minzhuo
name: Zhang, Jie
name: Fan, Jialong
name: Zhao, Yanzhong
name: Liu, Bin
Publisher: name: figshare
Year: 2022
Subjects: Biochemistry
Space Science
Medicine
Pharmacology
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified
Cancer

description: Additional file 1: Figure S1. A. CS-1 loading capacity and encapsulation efficiency of CPCCM NPs. B. Ce6 loading capacity and encapsulation efficiency of CPCCM NPs. Figure S2. Cell viability assay. A. Viability of 4T1 cells treated with CS-1. B. Viability of MDA-MB-231 cells treated with CS-1. The concentrations of CS-1 are 0, 1, 2.5, 5, 10, 15, and 20 μM, respectively. Figure S3. Viability of MDA-MB-231 cells treated with CS-1, Ce6, CPCC, and CPCCM with/without laser after 24/48 h. L represents 660 nm laser irradiation.
Simplifying Random Satisfiability Problem by Removing Frustrating Interactions
Creators: name: Ramezanpour, A.
name: Moghimi-Araghi, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Complexity (cs.CC)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: How can we remove some interactions in a constraint satisfaction problem (CSP) such that it still remains satisfiable? In this paper we study a modified survey propagation algorithm that enables us to address this question for a prototypical CSP, i.e. random K-satisfiability problem. The average number of removed interactions is controlled by a tuning parameter in the algorithm. If the original problem is satisfiable then we are able to construct satisfiable subproblems ranging from the original one to a minimal one with minimum possible number of interactions. The minimal satisfiable subproblems will provide directly the solutions of the original problem.
description: 21 pages, 16 figures
Comparison of individual characteristics on surface of a bullet fired from polygonal-rifled barrel using super-high vertical resolution non contact 3D surface profiler
Creators: name: Sakolkrit Akejakrawan
name: Suebpongsiri, Sarit
Publisher: name: Silpakorn University Research, Innovation and Creativity Administration Office
Year: 2019
Subjects: bullet surface
3D surface profiler
polygonal rifling

description: Science, Engineering and Health Studies, 13, 2, 52-58
Granular packs under vertical tapping: structure evolution, grain motion, and dynamical heterogeneities
Creators: name: Ciamarra, Massimo Pica
name: Nicodemi, Mario
name: Coniglio, Antonio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The compaction dynamics of a granular media subject to a sequence of vertical taps made of fluid pulses is investigated via Molecular Dynamics simulations. Our study focuses on three different levels: macroscopic (volume fraction), mesoscopic (Vorono\"ı volumes, force distributions) and microscopic (grain displacements). We show that the compaction process has many characteristics which are reminiscent of the slow dynamics of glass forming systems, as previously suggested. For instance the mean volume fraction slowly increases in time and approaches a stationary value following a stretched exponential law, and the associated compaction time diverges as the tapping intensity decreases. The study of microscopic quantities also put in evidence the existence of analogies with the dynamics of glass formers, as the existence of dynamical heterogeneities and spatially correlated motion of grains; however it also shows that there are important qualitative differences, as for instance in the role of the cage effect. Correlations between geometry and dynamics of the system at the grain level are put in evidence by comparing a particle Vorono\"ı volume and its displacement in a single tap.
Διερεύνηση χαρακτηριστικών στάθμευσης με 'Κάρτας Κατοίκου' στο κέντρο της Θεσσαλονίκης:
Creators: name: Στάθης, Γιάννης Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Χαρακτηριστικά Στάθμευσης
Κάρτα Κατοίκου
Κέντρο Θεσσαλονίκης
Parking Characteristics
Residential Card
Centre of Municipality of Thessaloniki

description: Η πολιτική στάθμευσης και η διαχείρισή της διαδραματίζουν πολύ σημαντικό ρόλο στην αστική κινητικότητα, τόσο για την ενίσχυση της προσβασιμότητας όσο και για τον περιορισμό της συμφόρησης στα αστικά κέντρα. Στη σύγχρονη "διαχείριση της κινητικότητας" οι χώροι στάθμευσης είναι ένα από τα σημαντικότερα εργαλεία διαχείρισης. Στην περιοχή του κέντρου της Θεσσαλονίκης έχει τεθεί σε εφαρμογή, μέχρι σήμερα ο συνδυασμός των μέτρων της ελεγχόμενης επί πληρωμή στάθμευσης και της παροχής κάρτας κατοίκου. Η περιοχή έχει χωριστεί σε ζώνες στις οποίες ισχύει το μέτρο της βραχυχρόνιας στάθμευσης, σε κάποια σημεία σε συνδυασμό με την κάρτα κατοίκου και σε κάποια χωρίς. Στόχος της Μεταπτυχιακής Διατριβής είναι η διερεύνηση των χαρακτηριστικών του μέτρου "Κάρτας Στάθμευσης Κατοίκου" και η αξιολόγηση της συμπεριφοράς των χρηστών του με τη χρήση ερωτηματολογίου. Τέλος, διαμορφώνονται τα συμπεράσματα όπου περιλαμβάνονται και οι προτάσεις για τη βελτίωση του μέτρου, όπως αυτές διατυπώθηκαν από τους ερωτηθέντες . Για το λόγο αυτό πραγματοποιήθηκε η συλλογή των απαραίτητων στοιχείων πεδίου τα οποία στηρίχτηκαν σε έρευνα ερωτηματολογίου. Η συλλογή των στοιχείων αφορούσε στα γενικότερα κοινωνικά και οικονομικά χαρακτηριστικά των κατόχων "Κάρτας Στάθμευσης Κατοίκου", στα γενικά χαρακτηριστικά μετακίνησης του κάθε ερωτούμενου και στα χαρακτηριστικά στάθμευσης.
description: Parking policy and parking management play a very important role in urban mobility, both in enhancing accessibility and in competing urban congestion. In modern ‘mobility management’ parking is one of the most important management tool. In the center of Thessaloniki two parking management measures have been implemented, controlled parking with fees and resident’s parking scheme. The implementation area is divided into zones, where the measure of short-term parking is applied in conjunction with the resident’s parking scheme. The aim of the current Master Thesis is to investigate the characteristics of the measure "Resident Parking Card" and to evaluate the behavior of users using a Questionnaire based Survey. Finally, significant conclusions are derived which include among other proposals for improving the measure. For this reason, the necessary data was collected at the field with the use of a Questionnaire based Survey as mentioned above. The data were related to the general social and economic characteristics of the owners of the "Parking Resident Card", the general characteristics of their mobility and the detailed characteristics of their parking practices.
Multi-objective finite element simulations of a sheet metal forming process via a knowledge based cloud simulation platform
Creators: name: Wang, Ailing
Publisher: name: Imperial College London
Year: 2018

description: Multi-objective finite element simulation of hot stamping of aluminium alloys was developed through an enabling simulation technique known as ‘Knowledge Based Cloud – Finite Element (KBC-FE)’ simulation. KBC-FE is the enabling simulation technique that operates on a dedicated cloud based simulation platform. While the core FE simulation is conducted using a commercial FE code, e.g. PAM-STAMP, advanced predictive models were implemented through the KBC-FE technique, offering alternative to sub-routines and broaden the advanced models applications to achieve multi-objective simulations. Multi-objective simulations comprise of individual advanced functional modules, each with its own speciality in the field of hot stamping. Advanced functional modules are research oriented, modules were constructed and collaborated, such that the post-form characteristics of a hot stamped component can be assessed from multiple aspects based on a conventional finite element simulation. The capability of advanced functional modules is demonstrated through the case studies of several hot formed AA6082 components, including monolithic blanks and tailor welded blanks of different thicknesses. A hot formed component undergoes non-isothermal and non-linear loading conditions during forming, resulting in complicated thermo-mechanical deformation history. The formability and post-form strength of the hot stamped components were predicted using specialised functional modules through the KBC-FE simulation technique. For each functional module, the module was constructed using relevant advanced phenomenological based predictive models, and were experimentally verified where good agreements were obtained. Multi-objective simulations were achieved base on validated modules, demonstrated by a U-shaped components that was successfully predicted and formed. The KBC-FE simulation technique allows multi-objective FE simulations to be conducted on a cloud-computing environment, which effectively reduces computation resources and expands the capability of FE simulation software. The KBC-FE simulation technique allows frontier research to be digitalised and its benefits are maximised through knowledge sharing and cross disciplinary knowledge integration.
On the reconstruction of diagonal elements of density matrix of quantum optical states by on/off detectors
Creators: name: Brida, G.
name: Genovese, M.
name: Gramegna, M.
name: Paris, M. G. A.
name: Predazzi, E.
name: Cagliero, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss a scheme for reconstructing experimentally the diagonal elements of the density matrix of quantum optical states. Applications to PDC heralded photons, multi-thermal and attenuated coherent states are illustrated and discussed in some details.
description: 10 pages, presented at Palermo "TQMFA2005" Conference. To appear on "Open Systems & Information Dynamics" (2006)
MPEC 2024-T127 : 2024 TR2
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TR2

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.
Information systems planning in a charitable organization
Creators: name: Ferguson, Steven Brent
Publisher: name: University of British Columbia
Year: 2009

description: The thrust of this thesis is a practical one, namely, how to do information systems planning in a small charitable organization. There are two relevant bodies of literature to be considered. The first is the Strategic Information Systems Planning (SISP) literature. The traditional methodologies recommended in this literature tend to be driven by business objectives moving from the identification of information requirements to the selection of supporting information technology (IT). The second body of literature, Business Process Reengineering (BPR), is growing rapidly, at least in part because it seeks to counter the criticism that the application of IT in organizations has in the past failed to deliver productivity gains. The BPR approach views IT as enabling the removal of constraints that are the result of out-dated organizational processes. Upon reviewing the SISP and BPR literature, it became apparent that both lacked the necessary operational specifics for straight forward application in the setting being studied. In particular, it was not clear how to integrate the process focused BPR and the more functional SISP methodologies, or how either could be applied in a charitable organization. The contributions to be made by this thesis include a description of an IS planning project done with the B.C. and Yukon Division of the Canadian Cancer Society, and a discussion of a proposed integrated approach called Organizational Information Systems Planning (OISP).