cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
An allosteric model of KaiC phosphorylation
Creators: name: van Zon, Jeroen S.
name: Lubensky, David K.
name: Altena, Pim R. H.
name: Wolde, Pieter Rein ten
Publisher: name: arXiv
Year: 2007
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Biological sciences

description: In a recent series of ground-breaking experiments, Nakajima et al. [Science 308, 414-415 (2005)] showed that the three cyanobacterial clock proteins KaiA, KaiB, and KaiC are sufficient in vitro to generate circadian phosphorylation of KaiC. Here, we present a mathematical model of the Kai system. At its heart is the assumption that KaiC can exist in two conformational states, one favoring phosphorylation and the other dephosphorylation. Each individual KaiC hexamer then has a propensity to be phosphorylated in a cyclic manner. To generate macroscopic oscillations, however, the phosphorylation cycles of the different hexamers must be synchronized. We propose a novel synchronisation mechanism based on differential affinity: KaiA stimulates KaiC phosphorylation, but the limited supply of KaiA dimers binds preferentially to those KaiC hexamers that are falling behind in the oscillation. KaiB sequesters KaiA and stabilizes the dephosphorylating KaiC state. We show that our model can reproduce a wide range of published data, including the observed insensitivity of the oscillation period to variations in temperature, and that it makes nontrivial predictions about the effects of varying the concentrations of the Kai proteins.
description: 8 pages, 6 figures. Accepted for publication in PNAS
Search for Lepton Flavor Violating tau^- Decays into \ell^-η, \ell^-η' and \ell^-π^0
Creators: name: Miyazaki, Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We have searched for lepton-flavor-violating $τ$ decays with a pseudoscalar meson ($η$, $η'$ {and} $π^0$) using a data sample of 401 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No evidence for these decays is found and we set the following upper limits on the branching fractions: ${\cal{B}}(τ^-\to e^-η) < 9.2\times 10^{-8}$, ${\cal{B}}(τ^-\to μ^-η) < 6.5\times 10^{-8}$, ${\cal{B}}(τ^-\to e^-η') < 1.6\times 10^{-7}$, ${\cal{B}}(τ^-\to μ^-η') < 1.3\times 10^{-7}$, ${\cal{B}}(τ^-\to e^-π^0) < 8.0\times 10^{-8}$ and ${\cal{B}}(τ^-\to μ^-π^0) < 1.2\times 10^{-7}$ at the 90% confidence level. These results improve our previously published upper limits by factors from 2.3 to 6.3.
description: 16 pages, 15 figures, submitted to Phys.Lett. B
All One-loop Maximally Helicity Violating Gluonic Amplitudes in QCD
Creators: name: Berger, Carola F.
name: Bern, Zvi
name: Dixon, Lance J.
name: Forde, Darren
name: Kosower, David A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use on-shell recursion relations to compute analytically the one-loop corrections to maximally-helicity-violating n-gluon amplitudes in QCD. The cut-containing parts have been computed previously; our work supplies the remaining rational parts for these amplitudes, which contain two gluons of negative helicity and the rest positive, in an arbitrary color ordering. We also present formulae specific to the six-gluon cases, with helicities (- + - + + +) and (- + + - + +), as well as numerical results for six, seven, and eight gluons. Our construction of the n-gluon amplitudes illustrates the relatively modest growth in complexity of the on-shell-recursive calculation as the number of external legs increases. These amplitudes add to the growing body of one-loop amplitudes known for all n, which are useful for studies of general properties of amplitudes, including their twistor-space structure.
description: 67 pages, 11 figures, v2 minor corrections, expanded discussion of numerical stability
Intraband exciton relaxation in a biased lattice with long-range correlated disorder
Creators: name: Díaz, E.
name: Domínguez-Adame, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study numerically the intraband exciton relaxation in a one-dimensional lattice with scale-free disorder, in the presence of a linear bias. Exciton transport is considered as incoherent hoppings over the eigenstates of the static lattice. The site potential of the unbiased lattice is long-range-correlated with a power-law spectral density $S(k) \sim 1/k^α$, $α> 0$. The lattice supports a phase of extended states at the center of the band, provided $α$ is larger than a critical value $α_c$ [F. A. B. F. de Moura and M. L. Lyra, Phys. Rev. Lett. \textbf{81}, 3735 (1998)]. When the bias is applied, the absorption spectrum displays clear signatures of the Wannier-Stark ladder [E. D\'ıaz \emph{et al.}, Phys. Rev. B\textbf{73}, 172410 (2006)]. We demonstrate that in unbiased lattices and in weakly correlated potentials the decay law is non-exponential. However, the decay is purely exponential when the bias increases and $α$ is large. We relate this exponential decay to the occurrence of the Wannier-Stark ladder in the exciton band.
REVIEW OF THE BOOK ''PSYCHOTIC DISORDERS IN MONTENEGRO: FINDINGS FROM THE IMPULSE STUDY''
Creators: name: Markovska-Simoska, Silvana
Publisher: name: Zenodo
Year: 2021
Subjects: psychosis
mental health
clinical assessment
psychopathology
psychometrics
Montenegro
IMPULSE study

description: A review of the monograph ''Psychotic disorders in Montenegro: Findings from the IMPULSE study'' (''Psihotični poremećaji u Crnoj Gori: Rezultati IMPULSE studije''. The book was authored by Prof. Lidija Injac Stevović, MD, PhD, Selman Repišti, MA, and Tamara Radojičić, MA.
Dispersionless Hirota equations of two-component BKP hierarchy
Creators: name: Takasaki, Kanehisa
Publisher: name: arXiv
Year: 2006
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The BKP hierarchy has a two-component analogue (the 2-BKP hierarchy). Dispersionless limit of this multi-component hierarchy is considered on the level of the $τ$-function. The so called dispersionless Hirota equations are obtained from the Hirota equations of the $τ$-function. These dispersionless Hirota equations turn out to be equivalent to a system of Hamilton-Jacobi equations. Other relevant equations, in particular, dispersionless Lax equations, can be derived from these fundamental equations. For comparison, another approach based on auxiliary linear equations is also presented.
description: Published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Developing a performance with special needs students : a case study in creativity
Creators: name: Secunda, David
Publisher: name: University of British Columbia
Year: 2010

description: This thesis advances the proposition that learning disabled students' participation in kinesthetic or dance and mime performance activities provides an alternative expressive mode to the verbally oriented activities through which creativity has traditionally been examined and evaluated. Between February and May, 1989, I designed and carried out research project in an elementary school in Vancouver, B.C. A group of students, characterized as "learning disabled," participated under my direction in the design, rehearsal, and presentation of a performance of mime and movement to a narrated text developed mainly by the students. Techniques of participant observation and interview (as well as videotape recordings) were used to document both students' activities and the responses of students and their teachers The technique of cognitive mapping was used to analyze observations of the students in kinesthetic activities. Results of this case study have implications for theory and practice. Theoretical implications relate to conceptions o creativity derived from Maslow's description of "peak experiences" and from analyzing Weisberg's definition of creativity. An applied outcome of this research allows practical generalizations about the use, design, and implementation of programmed kinesthetic activities as a means of encouraging creativity among learning disabled students.
title: Including Choice into Change Models via Scared So What
title: How do I explain change in a modern, simplistic, self-help model that incorporates personal choice and a support mechanism to see the change through?
titleType: Subtitle
Creators: name: Van Ulbrich, Grant
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Change Management
subject: personal change management
subject: Innovation management
subject: Management technique
subject: Self-Management
subject: Leadership

description: Change management models and leadership styles are not a one size fits all approach. This project shows how I was able to embrace aspects of Wilkinson’s (2006) Generative leadership style through ambiguity and create my own change management model. Setting out with a clear vision, and creating my own model, as a strategy (Kotter 2012) reflects a leadership vs management style to ultimately help my sales team to learn how to navigate their feelings and emotions through personal change scenarios.

SCARED SO WHAT is the first bespoke personal change model designed to help people learn to manage change for themselves and others.  It incorporates a persons ability to accept, reject, and be caught in confusion from a change situation. Initially It was designed to help my sales team and leadership in successfully launching a new sales academy for our cruise brands in the Royal Caribbean Group. It is when a much larger, unexpected change process occurred in the middle of this project, that this model began to help employees and myself in navigating the change process in a much simpler, easy to understand way. 

At the end of this research project, I have uncovered favorable recommendations for the SCARED SO WHAT model and believe that it has a future in helping people around the world in navigating personal change. “Change is constant – how you navigate the change makes it bearable and achievable” (Van Ulbrich, 2020).
Stability of multipeakons
Creators: name: Dika, Khaled El
name: Molinet, Luc
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: The Camassa-Holm equation possesses well-known peaked solitary waves that are called peakons. Their orbital stability has been established by Constantin and Strauss (2000). We prove here the stability of ordered trains of peakons. We also establish a result on the stability of multipeakons.
Amplitudes in Pure Yang-Mills and MHV Diagrams
Creators: name: Brandhuber, Andreas
name: Spence, Bill
name: Travaglini, Gabriele
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show how to calculate the one-loop scattering amplitude with all gluons of negative helicity in non-supersymmetric Yang-Mills theory using MHV diagrams. We argue that the amplitude with all positive helicity gluons arises from a Jacobian which occurs when one performs a Backlund-type holomorphic change of variables in the lightcone Yang-Mills Lagrangian. This also results in contributions to scattering amplitudes from violations of the equivalence theorem. Furthermore, we discuss how the one-loop amplitudes with a single positive or negative helicity gluon arise in this formalism. Perturbation theory in the new variables leads to a hybrid of MHV diagrams and lightcone Yang-Mills theory.
description: 31 pages, 4 figures. v2: references added, JHEP version
On accuracy assessment of celestial reference frame VLBI realizations
Creators: name: Malkin, Zinovy
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geophysics (physics.geo-ph)
subject: Astrophysics (astro-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: In this paper, we propose to use the scatter of celestial pole offset (CPO) series obtained from VLBI observations as a measure of the accuracy of the celestial reference frame (CRF) realizations. Several scatter indices (SIs) including those proposed for the first time are investigated. The first SI is based on analysis of residuals of CPO series w.r.t. Free Core Nutation (FCN) model. The second group of SIs includes Allan deviation and its extensions, which allow one to treat unequal and multidimensional observations. Application of these criteria to several radio source catalogues showed their ability to perform a preliminary assessment of the quality of radio source catalogues, and 2D Allan deviation estimate seems to be a most sensitive measure. However, in common case, the sensitivity of tested criteria is yet not sufficient to distinguish between radio source catalogues of the highest quality. Proposed extensions of Allan deviation, weighted and multidimensional, can be effectively used also for statistical analysis of astro-geodetic and other time series.
description: 7 pages, submitted to Journal of Geodesy
The [OII]3727 Luminosity function and Star Formation Rate at z~1.2 in the COSMOS 2 Square-degree Field and the Subaru Deep Field
Creators: name: Takahashi, M. I.
name: Shioya, Y.
name: Taniguchi, Y.
name: Murayama, T.
name: Ajiki, M.
name: Sasaki, S. S.
name: Koizumi, O.
name: Nagao, T.
name: Scoville, N. Z.
name: Mobasher, B.
name: Aussel, H.
name: Capak, P.
name: Carilli, C.
name: Ellis, R. S.
name: Garilli, B.
name: Giavalisco, M.
name: Guzzo, L.
name: Hasinger, G.
name: Impey, C.
name: Kitzbichler, M. G.
name: Koekemoer, A.
name: Fevre, O. Le
name: Lilly, S. J.
name: Maccagni, D.
name: Renzini, A.
name: Rich, M.
name: Sanders, D. B.
name: Schinnerer, E.
name: Scodeggio, M.
name: Shopbell, P.
name: Smolcic, V.
name: Tribiano, S.
name: Ideue, Y.
name: Mihara, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have carried out a wide-field imaging survey for [OII]3727 emitting galaxies at z~1.2 in the HST COSMOS 2 square degree field using the Suprime-Cam on the Subaru Telescope. The survey covers a sky area of 6700 arcmin^2 in the COSMOS field, and a redshift range between 1.17 and 1.20 (Delta_z = 0.03), corresponding to a survey volume of 5.56*10^5 Mpc^3. We obtain a sample of 3176 [OII] emitting galaxies with observed emission-line equivalent widths greater than 26 AA. Since our survey tends to sample brighter [OII]3727 emitting galaxies, we also analyze a sample of fainter [OII]3727 emitting galaxies found in the Subaru Deep Field (SDF). We find an extinction-corrected [OII] luminosity density of 10^{40.35^+0.08_-0.06} ergs s^-1 Mpc-3, corresponding to star formation rate density of 0.32^+0.06_-0.04 M_sun yr-1 Mpc^-3 in the COSMOS field at z~1.2. This is the largest survey for [OII]3727 emitters beyond z=1 currently available.
description: 33 pages, 9 figures. to appear in the ApJ Supplement COSMOS Special Issue
The statistical mechanics of multi-index matching problems with site disorder
Creators: name: Dean, David S.
name: Lancaster, David
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the statistical mechanics of multi-index matching problems where the quenched disorder is a geometric site disorder rather than a link disorder. A recently developed functional formalism is exploited which yields exact results in the finite temperature thermodynamic limit. Particular attention is paid to the zero temperature limit of maximal matching problems where the method allows us to obtain the average value of the optimal match and also sheds light on the algorithmic heuristics leading to that optimal match
description: 11 pages 11 figures, RevTex
Numerical optimization of a grating coupler for the efficient excitation of surface plasmons at an Ag-SiO2 interface
Creators: name: Lu, Jesse
name: Petre, Csaba
name: Conway, Josh
name: Yablonovitch, Eli
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The efficient generation of surface plasmons from free space optical waves is still an open problem in the field. Here we present a methodology and optimized design for a grating coupler. The photo-excitation of surface plasmons at an Ag-SiO2 interface is numerically demonstrated to yield greater than 50% coupling from a Gaussian beam into surface plasmon voltages and currents.
description: 5 figures
Hamiltonian and Brownian systems with long-range interactions: V. Stochastic kinetic equations and theory of fluctuations
Creators: name: Chavanis, Pierre-Henri
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We develop a theory of fluctuations for Brownian systems with weak long-range interactions. For these systems, there exists a critical point separating a homogeneous phase from an inhomogeneous phase. Starting from the stochastic Smoluchowski equation governing the evolution of the fluctuating density field, we determine the expression of the correlation function of the density fluctuations around a spatially homogeneous equilibrium distribution. In the stable regime, we find that the temporal correlation function of the Fourier components of the density fluctuations decays exponentially rapidly with the same rate as the one characterizing the damping of a perturbation governed by the mean field Smoluchowski equation (without noise). On the other hand, the amplitude of the spatial correlation function in Fourier space diverges at the critical point $T=T_{c}$ (or at the instability threshold $k=k_{m}$) implying that the mean field approximation breaks down close to the critical point and that the phase transition from the homogeneous phase to the inhomogeneous phase occurs sooner. By contrast, the correlations of the velocity fluctuations remain finite at the critical point (or at the instability threshold). We give explicit examples for the Brownian Mean Field (BMF) model and for Brownian particles interacting via the gravitational potential and via the attractive Yukawa potential. We also introduce a stochastic model of chemotaxis for bacterial populations generalizing the mean field Keller-Segel model by taking into account fluctuations.
Masses and semileptonic decays of doubly heavy baryons in a nonrelativistic quark model
Creators: name: Albertus, C.
name: Hernández, E.
name: Nieves, J.
name: Verde-Velasco, J. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We evaluate masses and semileptonic decay widths for the ground state of doubly heavy $Ξ$ and $Ω$ baryons in the framework of a nonrelativistic quark model. We solve the three-body problem by means of a variational ansatz made possible by heavy-quark spin symmetry constraints. Our masses are comparable to the ones obtained in relativistic calculations and we get one of the best agreements with lattice data. Our simple wave functions are used to evaluate semileptonic decays of doubly heavy $Ξ, Ξ'(J=1/2)$ and $Ω, Ω'(J=1/2)$ baryons. Our results for the decay widths are in reasonable agreement with calculations done in a relativistic calculation in the quark-diquark approximation. We also check that our wave functions comply with what it is expected in the infinite heavy quark mass limit.
description: 3 latex pages, two tables. To appear in the INPC07 proceedings
Fano fivefolds of index two with blow-up structure
Creators: name: Chierici, Elena
name: Occhetta, Gianluca
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J45

description: We classify Fano fivefolds of index two which are blow-ups of smooth manifolds along a smooth center.
description: Some inaccuracies and a mistake in proof of Proposition 4.7 corrected. Improved exposition. To appear in the Tohoku Mathematical Journal
Quiver varieties and Frenkel-Kac construction
Creators: name: Nagao, Kentaro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Representation Theory (math.RT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 17B67 (Primary) 14C05, 14D20, 16G20, 55N91, 81R10 (Secondary)

description: An affine Lie algebra acts on cohomology groups of quiver varieties of affine type. A Heisenberg algebra acts on cohomology groups of Hilbert schemes of points on a minimal resolution of a Kleinian singularity. We show that in the case of type $A$ the former is obtained by Frenkel-Kac construction from the latter.
description: 28pages
A system for measuring auto- and cross-correlation of current noise at low temperatures
Creators: name: DiCarlo, L.
name: Zhang, Y.
name: McClure, D. T.
name: Marcus, C. M.
name: Pfeiffer, L. N.
name: West, K. W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We describe the construction and operation of a two-channel noise detection system for measuring power and cross spectral densities of current fluctuations near 2 MHz in electronic devices at low temperatures. The system employs cryogenic amplification and fast-Fourier-transform based spectral measurement. The gain and electron temperature are calibrated using Johnson noise thermometry. Full shot noise of 100 pA can be resolved with an integration time of 10 s. We report a demonstration measurement of bias-dependent current noise in a gate defined GaAs/AlGaAs quantum point contact.
description: related papers at http://marcuslab.harvard.edu
Cold polar molecules in 2D traps: Tailoring interactions with external fields for novel quantum phases
Creators: name: Micheli, A.
name: Pupillo, G.
name: Büchler, H. P.
name: Zoller, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss techniques to engineer effective long-range interactions between polar molecules using external static electric and microwave fields. We consider a setup where molecules are trapped in a two-dimensional pancake geometry by a far-off-resonance optical trap, which ensures the stability of the dipolar collisions. We detail how to modify the shape and the strength of the long-range part of interaction potentials, which can be utilized to realize interesting quantum phases in the context of cold molecular gases.
description: 28 pages, 15 figures
Warped Kaluza-Klein Towers Revisited
Creators: name: Grard, Fernand
name: Nuyts, Jean
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Inspired by the warped Randall Sundrum scenario proposed to solve the mass scale hierarchy problem with a compactified fifth extra dimension, a similar model with no metric singularities has been elaborated. In this framework, the Kaluza-Klein reduction equations for a real massless scalar field propagating in the bulk have been studied carefully from the point of view of hermiticity so as to formulate in a mathematically rigorous way all the possible boundary conditions and corresponding mass eigenvalue towers and tachyon states. The physical masses as observable in our four-dimensional brane are deduced from these mass eigenvalues depending on the location of the brane on the extra dimension axis. Examples of mass towers and tachyons and related field probability densities are presented from numerical computations performed for some arbitrary choices of the parameters of the model.
description: 34 pages, 5 figures
Constraints on grain size and stable iron phases in the uppermost Inner Core from multiple scattering modeling of seismic velocity and attenuation
Creators: name: Calvet, Marie
name: Margerin, Ludovic
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We propose to model the uppermost inner core as an aggregate of randomly oriented anisotropic ``patches''. A patch is defined as an assemblage of a possibly large number of crystals with identically oriented crystallographic axes. This simple model accounts for the observed velocity isotropy of short period body waves, and offers a reasonable physical interpretation for the scatterers detected at the top of the inner core. From rigorous multiple scattering modeling of seismic wave propagation through the aggregate, we obtain strong constraints on both the size and the elastic constants of iron patches. We perform a systematic search for iron models compatible with measured seismic velocities and attenuations. An iron model is characterized by its symmetry (cubic or hexagonal), elastic constants, and patch size. Independent of the crystal symmetry, we infer a most likely size of patch of the order of 400 m. Recent {\it bcc} iron models from the literature are in very good agreement with the most probable elastic constants of cubic crystals found in our inversion. Our study (1) suggests that the presence of melt may not be required to explain the low shear wavespeeds in the inner core and (2) supports the recent experimental results on the stability of cubic iron in the inner core, at least in its upper part.
Shot-Noise Signatures of 0.7 Structure and Spin in a Quantum Point Contact
Creators: name: DiCarlo, L.
name: Zhang, Y.
name: McClure, D. T.
name: Reilly, D. J.
name: Marcus, C. M.
name: Pfeiffer, L. N.
name: West, K. W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report simultaneous measurement of shot noise and dc transport in a quantum point contact as a function of source-drain bias, gate voltage, and in-plane magnetic field. Shot noise at zero field exhibits an asymmetry related to the 0.7 structure in conductance. The asymmetry in noise evolves smoothly into the symmetric signature of spin-resolved electron transmission at high field. Comparison to a phenomenological model with density-dependent level splitting yields good quantitative agreement.
description: related papers at http://marcuslab.harvard.edu
Purely radiative perfect fluids
Creators: name: Bastiaensen, B.
name: Karimian, H. R.
name: Bergh, N. Van den
name: Wylleman, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study `purely radiative' (div E = div H = 0) and geodesic perfect fluids with non-constant pressure and show that the Bianchi class A perfect fluids can be uniquely characterized --modulo the class of purely electric and (pseudo-)spherically symmetric universes-- as those models for which the magnetic and electric part of the Weyl tensor and the shear are simultaneously diagonalizable. For the case of constant pressure the same conclusion holds provided one also assumes that the fluid is irrotational.
description: 12 pages, minor grammatical changes
Origin of lower velocity dispersions of ultra-compact dwarf galaxy populations in clusters of galaxies
Creators: name: Bekki, Kenji
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent observations have revealed that velocity dispersions of ``ultra-compact dwarf'' (UCD) galaxies are significantly smaller than those of other galaxy populations in the Fornax and the Virgo clusters of galaxies. In order to understand the origin of the observed lower velocity dispersions of UCDs, we numerically investigate line-of-sight velocity dispersion (sigma_los) of galaxy populations with variously different orbits in clusters of galaxies with the total masses of M_cl. We particularly investigate radial velocity dispersion profiles (sigma_los(R)) and velocity dispersions within the central 200 kpc of a cluster model (sigma_m) for galaxies with different pericenter distances (r_p) and orbital eccentricities (e) in the model with M_cl = 7.0 x 10^13 M_sun reasonable for the Fornax cluster. We find that sigma_los(R) and sigma_m of galaxies with smaller r_p are steeper and smaller, respectively, for a given initial e distribution of galaxies. For example, we find that sigma_m is ~ 260 km/s for galaxies with r_p <50 kpc and ~ 336 km/s for all galaxies in the model with the mean e of 0.6. These results imply that the observed lower velocity dispersion of UCD population is consistent with the UCDs having significantly smaller r_p than other galaxy populations in the Fornax. We discuss these results in the context of the ``galaxy threshing'' scenario in which UCDs originate from nuclei of nucleated dwarf galaxies. We suggest that the observed differences in kinematical properties between UCDs and other dwarf galaxy populations in clusters of galaxies can be understood in terms of the differences in orbital properties between UCDs and the dwarf populations.
description: 6 pages, 5 figures, MNRAS in press
Comparison of protein OprF from Pseudomonas syringae with protein OprF from Pseudomonas aeruginosa
Creators: name: Ullstrom, Catherine Ann MacDonald
Publisher: name: University of British Columbia
Year: 2010

description: The major outer membrane protein OprF from Pseudomonas aeruginosa was compared with OprF from the fluorescent phytopathogen Pseudomonas syringae. The P. syringae oprF gene was subcloned and sequenced and found to code for a sequence of 344 amino acids containing a 24 amino acid leader sequence. The mature protein, with a deduced molecular weight of 34,225, contained four cysteine residues and an alanine-proline rich area. Comparison of the P. syringae OprF amino acid sequence with the P. aeruginosa OprF and the E. coli OmpA sequences showed that the sequences were most similar at the carboxy-terrninal ends. Restriction enzyme site heterogeneity near the oprF gene from nine different P. syringae pathovars was determined. All pathovars had a conserved SalI site within the gene and conserved PstI. and BamHI sites near the ends of the gene. The location of the PstI and the SalI sites outside the gene was variable, although similar. Immunological relatedness between P. syringae OprF from the different pathovars and P. aeruginosa OprF was confirmed. Protein OprF from all the pathovars was shown to be 2-mercaptoethanol modifiable and more easily heat modifiable than was OprF from P. aeruginosa.
The asymptotics of stationary electro-vacuum metrics in odd space-time dimensions
Creators: name: Beig, Robert
name: Chruściel, Piotr T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that stationary, asymptotically flat solutions of the electro-vacuum Einstein equations are analytic at $i^0$, for a large family of gauges, in odd space-time dimensions higher than seven. The same is true in space-time dimension five for static vacuum solutions with non-vanishing mass.
description: 9 pages, no figures; minor changes, one reference added
Concordance Crosscap Numbers of Knots and the Alexander Polynomial
Creators: name: Livingston, Charles
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25

description: For a knot K, the concordance crosscap number, c(K), is the minimum crosscap number among all knots concordant to K. Building on work of G. Zhang, which studied the determinants of knots with c(K) < 2, we apply the Alexander polynomial to construct new algebraic obstructions to c(K) < 2. With the exception of low crossing number knots previously known to have c(K) < 2, the obstruction applies to all but four prime knots of 11 or fewer crossings.
description: 3 pages, typographical corrections
Shock-Wave Heating Model for Chondrule Formation: Prevention of Isotopic Fractionation
Creators: name: Miura, Hitoshi
name: Nakamoto, Taishi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Chondrules are considered to have much information on dust particles and processes in the solar nebula. It is naturally expected that protoplanetary disks observed in present star forming regions have similar dust particles and processes, so study of chondrule formation may provide us great information on the formation of the planetary systems. Evaporation during chondrule melting may have resulted in depletion of volatile elements in chondrules. However, no evidence for a large degree of heavy-isotope enrichment has been reported in chondrules. In order to meet this observed constraint, the rapid heating rate at temperatures below the silicate solidus is required to suppress the isotopic fractionation. We have developed a new shock-wave heating model taking into account the radiative transfer of the dust thermal continuum emission and the line emission of gas molecules and calculated the thermal history of chondrules. We have found that optically-thin shock waves for the thermal continuum emission from dust particles can meet the rapid heating constraint, because the dust thermal emission does not keep the dust particles high temperature for a long time in the pre-shock region and dust particles are abruptly heated by the gas drag heating in the post-shock region. We have also derived the upper limit of optical depth of the pre-shock region using the radiative diffusion approximation, above which the rapid heating constraint is not satisfied. It is about 1 - 10.
description: 58 pages, including 5 tables and 15 figures, accepted for publication in The Astrophysical Journal
The logarithmic equation of state for superconducting cosmic strings
Creators: name: Hartmann, Betti
name: Carter, Brandon
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This investigation follows up the suggestion that the equation of state for superconducting cosmic strings provided by Witten's prototype biscalar field model can be well represented by an effective Lagrangian of simple logarithmic form depending on only 3 independent parameters. The numerical work described here confirms the validity of this approximation, and initiates the evaluation of the 3 required parameters, as functions of the masses and other parameters specifying the underlying U(1) x U(1) scalar field model in the limit for which the relevant gauge coupling constants are small.In this limit, subject to calibration of the relevant length and mass scales, the scalar field model is characterised by just 3 dimensionless ratios which (in order to provide conducting strings) must be subject to three inequalities (of which two have obvious analytic expressions). It is found here that when all three of these inequalities are satisfied by a reasonably large margin, there is a simple empirical formula that can be used to provide a fairly accurate prescription for the algebraic dependence on these 3 dimensionless ratios of the 3 parameters required for the logarithmic equation of state.
description: 15 pages including 5 figures; v2: notation used in eq. (6) clarified
SAPIENS CHAIN: A BLOCK CHAIN-BASED CYBER SECURITY FRAMEWORK
Creators: name: Han, Yu
name: Wang, Zhongru
name: Ruan, Qiang
name: Fang, Binxing
Publisher: name: figshare
Year: 2018
Subjects: classificationCode: 460308
subject: Pattern recognition
classificationCode: 460502
subject: Data mining and knowledge discovery

description: Recently, cybersecurity becomes more and more important due to the rapid development of Internet. However, existing methods are in reality highly sensitive to attacks and are far more vulnerable than expected, as they are lack of trustable measures. In this paper, to address the aforementioned problems, we propose a blockchain-based cybersecurity framework, termed as Sapiens Chain, which can protect the privacy of the anonymous users and ensure that the transactions are immutable by providing decentralized and trustable services. Integrating semantic analysis, symbolic execution, and routing learning methods into intelligent auditing, this framework can achieve good accuracy for detecting hidden vulnerabilities. In addition, a revenue incentive mechanism, which aims to donate participants, is built. The practical results demonstrate the effectiveness of the proposed framework.
Frequency-Tunable Josephson Junction Resonator for Quantum Computing
Creators: name: Osborn, K. D.
name: Strong, J. A.
name: Sirois, A. J.
name: Simmonds, R. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have fabricated and measured a high-Q Josephson junction resonator with a tunable resonance frequency. A dc magnetic flux allows the resonance frequency to be changed by over 10 %. Weak coupling to the environment allows a quality factor of $\thicksim$7000 when on average less than one photon is stored in the resonator. At large photon numbers, the nonlinearity of the Josephson junction creates two stable oscillation states. This resonator can be used as a tool for investigating the quality of Josephson junctions in qubits below the single photon limit, and can be used as a microwave qubit readout at high photon numbers.
description: 3 pages, 5 figures
Zu jeder Aufgabe die richtige Strategie? Zum Stellenwert literarischer Strategien für Aufgaben im kompetenzorientierten Literaturunterricht
Creators: name: Scheubeck, Teresa
name: Knott, Christina
name: Schilcher, Anita
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: Kultursemiotik, Mediensemiotik, Lehrerbildung
subject: 430 Deutsch

description: Im folgenden Text sollen diese zwei grundlegenden Herausforderungen für den Literaturunterricht fokussiert werden: Einerseits geht es um eine höhere Zielbewusstheit, also darum, dass die Lernenden wissen, welche Ziele sie im Literaturunterricht erreichen sollen und welche Kriterien für das Erreichen dieser Ziele erfüllt werden müssen. Auf der anderen Seite werden Strategien beschrieben, die für die Zielerreichung angewendet werden können und mit denen ein Fortschritt im Lernprozess erreicht werden kann. Theoretische Grundlage für diese Strategien bildet das semiotische Modell literarischer Kompetenz von Schilcher/Pissarek (Hgg.).
2D Navier-Stokes equation in Besov spaces of negative order
Creators: name: Brzezniak, Z.
name: Ferrario, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q30; 76D05; 76D03; 35D05; 35D10

description: The Navier--Stokes equation in the bidimensional torus is considered, with initial velocity and forcing term in suitable Besov spaces. Results of local existence and uniqueness are proven; under further restriction on the indexes defining the Besov speces involved, we prove global existence.
description: 26 pages
Suppression of Zeno effect for distant detectors
Creators: name: Delgado, F.
name: Muga, J. G.
name: Garcia-Calderon, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe the influence of continuous measurement in a decaying system and the role of the distance from the detector to the initial location of the system. The detector is modeled first by a step absorbing potential. For a close and strong detector, the decay rate of the system is reduced; weaker detectors do not modify the exponential decay rate but suppress the long-time deviations above a coupling threshold. Nevertheless, these perturbing effects of measurement disappear by increasing the distance between the initial state and the detector, as well as by improving the efficiency of the detector.
description: 4 pages, 4 figures
Elementary students' comprehension of computer presented text
Creators: name: Bird, Paul
Publisher: name: University of British Columbia
Year: 2010

description: The study investigated grade 6 students' comprehension of narrative text when presented on a computer and as printed words on paper. A set of comprehension tests were developed for three stories of varying length (382 words, 1047 words and 1933 words) using a skills hierarchy protocol. The text for each story was prepared for presentation on a Macintosh computer using a program written for the study and as print in the form of exact copies of the computer screen. Students from two grade 6 classes in a suburban elementary school were randomly assigned to read one of the stories in either print form or on the computer and subsequently completed a comprehension test as well as a questionnaire concerning attitude and personal information. The responses from the comprehension tests were evaluated by graduate students in Language Education. The data evolved from the tests and questionnaires were analysed to determine measures of test construct validity, inter-rater reliability, and any significant difference in the means of comprehension scores for the two experimental groups for each story. The results indicated small but insignificant differences between the means of the three comprehension test scores for computer and print. A number of students reading from the computer complained of eye fatigue. The scores of subjects reading the longest story and complaining of eye fatigue were significantly lower.
The rational parts of one-loop QCD amplitudes I: The general formalism
Creators: name: Xiao, Zhi-Guang
name: Yang, Gang
name: Zhu, Chuan-Jie
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A general formalism for computing only the rational parts of oneloop QCD amplitudes is developed. Starting from the Feynman integral representation of the one-loop amplitude, we use tensor reduction and recursive relations to compute the rational parts directly. Explicit formulas for the rational parts are given for all bubble and triangle integrals. Formulas are also given for box integrals up to two-masshard boxes which are the needed ingredients to compute up to 6-gluon QCD amplitudes. We use this method to compute explicitly the rational parts of the 5- and 6-gluon QCD amplitudes in two accompanying papers.
description: 49 pages, 8 figure and LaTeX file; minor corrections, references added, to be published in Nucl. Phys. B
On the mixed Cauchy problem with data on singular conics
Creators: name: Ebenfelt, Peter
name: Render, Hermann
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 35A10, 35J05

description: We consider a problem of mixed Cauchy type for certain holomorphic partial differential operators whose principal part $Q_{2p}(D)$ essentially is the (complex) Laplace operator to a power, $Δ^p$. We pose inital data on a singular conic divisor given by P=0, where $P$ is a homogeneous polynomial of degree $2p$. We show that this problem is uniquely solvable if the polynomial $P$ is elliptic, in a certain sense, with respect to the principal part $Q_{2p}(D)$.
Comparing persistence diagrams through complex vectors
Creators: name: Di Fabio, Barbara
name: Ferri, Massimo
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: MAT/03 Geometria

description: The natural pseudo-distance of spaces endowed with filtering functions is precious for shape classification and retrieval; its optimal estimate coming from persistence diagrams is the bottleneck distance, which unfortunately suffers from combinatorial explosion. A possible algebraic representation of persistence diagrams is offered by complex polynomials; since far polynomials represent far persistence diagrams, a fast comparison of the coefficient vectors can reduce the size of the database to be classified by the bottleneck distance. This article explores experimentally three transformations from diagrams to polynomials and three distances between the complex vectors of coefficients.
Radiative Lifting of Flat Directions of the MSSM in de Sitter Background
Creators: name: Garbrecht, Bjorn
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The one-loop effective potential for a charged scalar field in de Sitter background is studied. We derive an approximate form for the gauge boson propagator with a general covariant gauge-fixing parameter ξ. This expression is used to derive an explicitly gauge-invariant effective potential, which agrees with earlier results obtained in Landau gauge. Adding the scalar- and fermion-loop contributions, that arise in a supersymmetric Higgs model, we find that the effective potential is vanishing to first order in the Hubble rate H^2. The contribution due to a chiral multiplet running in the loop is however non-vanishing. When applied to a flat direction of the MSSM with VEV w, a logarithmically running correction of order $h^2 H^2 w^2$ arises, where h is Yukawa coupling. This is of particular importance for D-term inflation or models endowed with a Heisenberg symmetry, where Hubble scale mass terms for flat directions from supergravity corrections are absent.
description: 14 pages
Guidelines of Special Care Dentistry in Patients with Chromosomal and Genetic syndromes
Creators: name: Cremonesi, Ilaria <1988>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: MED/28 Malattie odontostomatologiche

description: Chromosomal and genetic syndromes are frequently associated with dental and cranio-facial alterations. The aim of our study  is to identify and describe the dental and craniofacial alterations typical of six genetic and chromosomal syndromes examined.
Materials and Methods- A dental visit was performed to 195 patients referred from Sant’Orsola Hospital of Bologna, University  of Bologna, to Service of Special Need Dentistry, Dental Clinic, Department of Biomedical and Neuromotor Science, University of Bologna. The patients recruited were 137 females and 58 males, in an age range of 3-49 years (mean age of 13.8±7.4). The total sample consisted of subjects affected with Down Syndrome (n=133), Familiar Hypophosphatemic Ricket (n=10), Muscular Dystrophies (n=12), Noonan Syndrome (n=13), Turner Syndrome (n=17), Williams Syndrome(n=10). A questionnaire regarding detailed medical and dental history, oral health and dietary habits,  was filled by parents/caregivers, or patients themselves when possible. The intra-oral and extra-oral examination valued the presence of facial asymmetries, oral habits, dental and skeletal malocclusions, dental formula, dental anomalies, Plaque Index (Silness&LÖe Index), caries prevalence (dmft/DMFT index), gingivitis and periodontal disease, and mucosal lesions. Radiographic examinations (Intraoral radiographies, Orthopanoramic, Skull teleradiography) were executed according to patient’s age and treatment planning.  A review of literature about each syndrome and its dental and cranio-facial characteristics  and about caries, hygiene status and malocclusion prevalence on syndromic and non-syndromic population was performed. 
Results - The data of all the patients were collected in the “Data Collection Tables” created for each syndrome. General anamnesis information, oral hygiene habits and dmft/DMFT, PI, malocclusion prevalence were calculated and compared to syndromic and non-syndromic population results found in literature.
Discussions and conclusions - Guidelines of Special Care dentistry were indicated for each syndrome, in relation to each syndrome features and individual patient characteristics.