cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Molecular gas and continuum emission in 3C48: Evidence for two merger nuclei?
Creators: name: Krips, M.
name: Eckart, A.
name: Neri, R.
name: Zuther, J.
name: Downes, D.
name: Scharwaechter, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new interferometer observations of the CO(1-0) line and mm continuum emission from 3C48 - one of the nearest examples of a merger activating a quasar. Our new CO data show that most of the CO is not in a disk around the quasar 3C48, but rather in a second nucleus associated with the source 3C48A ~1" to the north-east, recently studied in the near-IR by Zuther et al. (2004). This main CO source has a strong velocity gradient (140km/s over about 1"). Our new data also show a second, weaker CO source at the QSO itself. At 1.2mm, the continuum emission is elongated in the direction of the radio jet and towards 3C48A. We model the 1.2mm continuum with three different sources in 3C48 - the 3C48 QSO, the 3C48 jet, and the second nucleus 3C48A. We suggest that the unusually bright and extended nature of the jet may be due to its interaction with the second merger nucleus 3C48A.
description: 11 pages, 11 figures, accepted for publication in A&A
Experimental Study of chi_b(2P) --> pi pi chi_b(1P)
Creators: name: Cawlfield, C.
name: Collaboration, CLEO
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We have searched for the di-pion transition chi_b(2P) -> pi pi chi_b(1P) in the CLEO III sample of Upsilon(3S) decays in the exclusive decay chain: Upsilon(3S) -> gamma chi_b(2P), chi_b(2P) -> pi pi chi_b(1P), chi_b(1P) -> gamma Upsilon(1S), Upsilon(1S) -> lepton pairs. Our studies include both pi+ pi- and pi0 pi0, each analyzed both in fully reconstructed events and in events with one pion undetected. We show that the null hypothesis is not substantiated. Under reasonable assumptions, we find the partial decay width to be Gamma[chi_b(2P) -> pi pi chi_b(1P)] = (0.83 +/- 0.22 +/- 0.08 +/- 0.19) keV, with the uncertainties being statistical, internal CLEO systematics, and common systematics from outside sources.
description: 14 pages postscript,also available through thishttp://www.lns.cornell.edu/public/CLNS/2005/, Submitted to PRD
Polarization-driven Semantic Segmentation via Efficient Attention-bridged Fusion
Creators: name: Xiang, Kaite
name: Yang, Kailun
name: Wang, Kaiwei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Robotics (cs.RO)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Semantic Segmentation (SS) is promising for outdoor scene perception in safety-critical applications like autonomous vehicles, assisted navigation and so on. However, traditional SS is primarily based on RGB images, which limits the reliability of SS in complex outdoor scenes, where RGB images lack necessary information dimensions to fully perceive unconstrained environments. As preliminary investigation, we examine SS in an unexpected obstacle detection scenario, which demonstrates the necessity of multimodal fusion. Thereby, in this work, we present EAFNet, an Efficient Attention-bridged Fusion Network to exploit complementary information coming from different optical sensors. Specifically, we incorporate polarization sensing to obtain supplementary information, considering its optical characteristics for robust representation of diverse materials. By using a single-shot polarization sensor, we build the first RGB-P dataset which consists of 394 annotated pixel-aligned RGB-Polarization images. A comprehensive variety of experiments shows the effectiveness of EAFNet to fuse polarization and RGB information, as well as the flexibility to be adapted to other sensor combination scenarios.
description: Accepted by Optics Express. 18 pages, 16 figures, 3 tables, 9 equations. Code will be made publicly available at https://github.com/Katexiang/EAFNet
Gravitational wave lensing beyond general relativity: birefringence, echoes and shadows
Creators: name: Ezquiaga, Jose María
name: Zumalacárregui, Miguel
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Gravitational waves (GW), as light, are gravitationally lensed by intervening matter, deflecting their trajectories, delaying their arrival and occasionally producing multiple images. In theories beyond general relativity (GR), new gravitational degrees of freedom add an extra layer of complexity and richness to GW lensing. We develop a formalism to compute GW propagation beyond GR over general space-times, including kinetic interactions with new fields. Our framework relies on identifying the dynamical propagation eigenstates (linear combinations of the metric and additional fields) at leading order in a short-wave expansion. We determine these eigenstates and the conditions under which they acquire a different propagation speed around a lens. Differences in speed between eigenstates cause birefringence phenomena, including time delays between the metric polarizations (orthogonal superpositions of $h_+,h_\times$) observable without an electromagnetic counterpart. In particular, GW echoes are produced when the accumulated delay is larger than the signal's duration, while shorter time delays produce a scrambling of the wave-form. We also describe the formation of GW shadows as non-propagating metric components are sourced by the background of the additional fields around the lens. As an example, we apply our methodology to quartic Horndeski theories with Vainshtein screening and show that birefringence effects probe a region of the parameter space complementary to the constraints from the multi-messenger event GW170817. In the future, identified strongly lensed GWs and binary black holes merging near dense environments, such as active galactic nuclei, will fulfill the potential of these novel tests of gravity.
description: Matches PRD version (only minor changes w.r.t. v1)
The OPE of the B-meson light-cone wavefunction for exclusive B decays: radiative corrections and higher-dimensional operators
Creators: name: Kawamura, Hiroyuki
name: Kodaira, Jiro
name: Tanaka, Kazuhiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the B-meson light-cone wavefunction relevant for QCD factorization approach for exclusive B-meson decays. We derive the operator product expansion for the B-meson light-cone wavefunction, taking into account the local composite operators of dimension less than 6 and calculating the radiative corrections at order α_s for the corresponding Wilson coefficients. The result embodies peculiar UV and IR behaviors of the B-meson light-cone wavefunction, the Sudakov-type double logarithmic effects and the mixing of the multiparticle states with additional gluons inside the B meson. The former effects are induced from the cusp singularity in the radiative corrections, while the latter is manifested by the participation of the higher-dimensional operators associated with the nonperturbative structure of the B meson.
description: 6 pages, to appear in the proceedings of 8th International Symposium on Radiative Corrections (RADCOR 2007), Florence, Italy, October 1-5; corrected typos
title: Kształtowanie zrównoważonych osiedli miejskich: ekoosiedli – wybrane zagadnienia
Creators: name: Trojanowska, Monika
Publisher: name: Publishing House of Poznan University of Technology
Year: 2023

description: Zeszyty Naukowe Politechniki Poznańskiej. Architektura, Urbanistyka, Architektura Wnętrz, 15, 281-293
Quantum secret sharing between multi-party and multi-party without entanglement
Creators: name: Yan, Feng-Li
name: Gao, Ting
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a quantum secret sharing protocol between multi-party ($m$ members in group 1) and multi-party ($n$ members in group 2) using a sequence of single photons. These single photons are used directly to encode classical information in a quantum secret sharing process. In this protocol, all members in group 1 directly encode their respective keys on the states of single photons via unitary operations, then the last one (the $m^{th}$ member of group 1) sends $1/n$ of the resulting qubits to each of group 2. Thus the secret message shared by all members of group 1 is shared by all members of group 2 in such a way that no subset of each group is efficient to read the secret message, but the entire set (not only group 1 but also group 2) is. We also show that it is unconditionally secure. This protocol is feasible with present-day techniques.
description: 6 pages, no figure
Wavefront sensing and control in space-based coronagraph instruments using Zernike's phase-contrast method
Creators: name: Ruane, Garreth
name: Wallace, J. Kent
name: Steeves, John
name: Prada, Camilo Mejia
name: Seo, Byoung-Joon
name: Bendek, Eduardo
name: Coker, Carl
name: Chen, Pin
name: Crill, Brendan
name: Jewell, Jeff
name: Kern, Brian
name: Marx, David
name: Poon, Phillip K.
name: Redding, David
name: Riggs, A J Eldorado
name: Siegler, Nicholas
name: Zimmer, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Future space telescopes with coronagraph instruments will use a wavefront sensor (WFS) to measure and correct for phase errors and stabilize the stellar intensity in high-contrast images. The HabEx and LUVOIR mission concepts baseline a Zernike wavefront sensor (ZWFS), which uses Zernike's phase contrast method to convert phase in the pupil into intensity at the WFS detector. In preparation for these potential future missions, we experimentally demonstrate a ZWFS in a coronagraph instrument on the Decadal Survey Testbed in the High Contrast Imaging Testbed facility at NASA's Jet Propulsion Laboratory. We validate that the ZWFS can measure low- and mid-spatial frequency aberrations up to the control limit of the deformable mirror, with surface height sensitivity as small as 1 pm, using a configuration similar to the HabEx and LUVOIR concepts. Furthermore, we demonstrate closed-loop control, resolving an individual DM actuator, with residuals consistent with theoretical models. In addition, we predict the expected performance of a ZWFS on future space telescopes using natural starlight from a variety of spectral types. The most challenging scenarios require ~1 hr of integration time to achieve picometer sensitivity. This timescale may be drastically reduced by using internal or external laser sources for sensing purposes. The experimental results and theoretical predictions presented here advance the WFS technology in the context of the next generation of space telescopes with coronagraph instruments.
description: Accepted for publication in JATIS
Two Families of Hypercyclic Non-Convolution Operators
Creators: name: Myers, Alex
name: Odinaev, Muhammadyusuf
name: Walmsley, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: Let $H(\mathbb{C})$ be the set of all entire functions endowed with the topology of uniform convergence on compact sets. Let $λ,b\in\mathbb{C}$, let $C_{λ,b}:H(\mathbb{C})\to H(\mathbb{C})$ be the composition operator $C_{λ,b} f(z)=f(λz+b)$, and let $D$ be the derivative operator. We extend results on the hypercyclicity of the non-convolution operators $T_{λ,b}=C_{λ,b} \circ D$ by showing that whenever $|λ|\geq 1$, the collection of operators \begin{align*} \{ψ(T_{λ,b}): ψ(z)\in H(\mathbb{C}), ψ(0)=0 \text{ and } ψ(T_{λ,b}) \text{ is continuous}\} \end{align*} forms an algebra under the usual addition and multiplication of operators which consists entirely of hypercyclic operators (i.e., each operator has a dense orbit). We also show that the collection of operators \begin{align*} \{C_{λ,b}\circφ(D): φ(z) \text{ is an entire function of exponential type with } φ(0)=0\} \end{align*} consists entirely of hypercyclic operators.
scCross: efficient search for rare subpopulations across multiple single-cell samples
Creators: name: Gerniers, Alexander
Publisher: name: Zenodo
Year: 2024

description: This repository contains a snapshot of the scCross implementation and the breast cancer data used in section 3.1 of the manuscript.

 

The latest version of the software is available at https://github.com/agerniers/scCross/
Spin-dependent recombination in GaAsN alloys
Creators: name: Kalevich, V. K.
name: Ivchenko, E. L.
name: Afanasiev, M. M.
name: Egorov, A. Yu.
name: Shiryaev, A. Yu.
name: Ustinov, V. M.
name: Pal, B.
name: Masumoto, Y.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The spin-dependent recombination (SDR) has been observed in GaAs_{1-x}N_{x} (x = 2.1, 2.7, 3.4%) at room temperature. It reveals itself in a decrease of the edge photoluminescence (PL) intensity by more than a factor of 3 when either the polarization of the exciting light is changed from circular to linear or the transverse magnetic field of ~300 gauss (G) is applied. The interband absorption of the circularly polarized light results in a spin polarization of conduction electrons, which reaches 35% with increasing the pump intensity. The effects observed are explained by dynamical polarization of deep paramagnetic centers and spin-dependent capture of conduction electrons by these centers. The PL depolarization in a transverse magnetic field (Hanle effect) allows us to estimate the electron spin relaxation time in the range of 1 ns. Theoretically, it has been concluded that, due to the SDR, this long time is controlled by slow spin relaxation of bound electrons. In all the three alloy samples, a positive sign of the bound-electron g-factor is determined experimentally from the direction of their mean spin rotation in the magnetic field.
description: 4 pages, 2 figures, submitted to JETP Letters
The soft and the hard pomerons in hadron elastic scattering at small t
Creators: name: Cudell, J. R.
name: Lengyel, A.
name: Martynov, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We consider simple-pole descriptions of soft elastic scattering for pp, pbar p, pi+ p, pi- p, K+ p and K- p. We work at t and s small enough for rescatterings to be neglected, and allow for the presence of a hard pomeron. After building and discussing an exhaustive dataset, we show that simple poles provide an excellent description of the data in the region - 0.5 GeV^2 < t < -0.1 GeV^2, 6 GeV
description: 27 pages, 9 figures, LaTeX. A few typos fixed, and references corrected
Elevated r-process enrichment in Gaia Sausage and Sequoia
Creators: name: Aguado, David S.
name: Belokurov, Vasily
name: Myeong, G. C.
name: Evans, N. Wyn
name: Kobayashi, Chiaki
name: Sbordone, Luca
name: Chanamé, Julio
name: Navarrete, Camila
name: Koposov, Sergey E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Gaia Sausage (GS) and the Sequoia represent the major accretion events that formed the stellar halo of the Milky Way. A detailed chemical study of these main building blocks provides a pristine view of the early steps of the Galaxy's assembly. We present the results of the analysis of the UVES high-resolution spectroscopic observations at the 8.2m VLT of 9 Sausage/Sequoia members selected kinematically using Gaia DR2. We season this set of measurements with archival data from Nissen & Schuster (2011) and GALAH DR3 (2020). Here, we focus on the neutron-capture process by analysing Sr, Y, Ba and Eu behavior. We detect clear enhancement in Eu abundance ([Eu/Fe]~0.6-0.7) indicative of large prevalence of r-process in the stellar n-capture makeup. We are also able to trace the evolution of the heavy element production across a wide range of metallicity. The barium to europium changes from a tight, flat sequence with [Ba/Eu]=-0.7 reflecting dominant contribution from exploding massive stars, to a clear upturn at higher iron abundances, betraying the onset of contamination from asymptotic giant branch (AGB) ejecta. Additionally, we discover two clear sequences in [Fe/H]-[Ba/Fe] plane likely caused by distinct levels of s-process pollution and mixing within the GS progenitor.
description: 10 pages, 5 figures, Accepted in ApJ Letters
Large Deviations Analysis for the Detection of 2D Hidden Gauss-Markov Random Fields Using Sensor Networks
Creators: name: Sung, Youngchul
name: Poor, H. Vincent
name: Yu, Heejung
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences
subject: E.4; H.1.1

description: The detection of hidden two-dimensional Gauss-Markov random fields using sensor networks is considered. Under a conditional autoregressive model, the error exponent for the Neyman-Pearson detector satisfying a fixed level constraint is obtained using the large deviations principle. For a symmetric first order autoregressive model, the error exponent is given explicitly in terms of the SNR and an edge dependence factor (field correlation). The behavior of the error exponent as a function of correlation strength is seen to divide into two regions depending on the value of the SNR. At high SNR, uncorrelated observations maximize the error exponent for a given SNR, whereas there is non-zero optimal correlation at low SNR. Based on the error exponent, the energy efficiency (defined as the ratio of the total information gathered to the total energy required) of ad hoc sensor network for detection is examined for two sensor deployment models: an infinite area model and and infinite density model. For a fixed sensor density, the energy efficiency diminishes to zero at rate O(area^{-1/2}) as the area is increased. On the other hand, non-zero efficiency is possible for increasing density depending on the behavior of the physical correlation as a function of the link length.
description: To appear in the Proceedings of the 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March 30 - April 4, 2008
Type $\mathbf{\bar{0}}$ Heterotic String Orbifolds
Creators: name: Faraggi, Alon E.
name: Matyas, Viktor G.
name: Percival, Benjamin
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The $Z_2\times Z_2$ heterotic string orbifold gives rise to a large space of phenomenological three generation models that serves as a testing ground to explore how the Standard Model of particle physics may be incorporated in a theory of quantum gravity. Recently, we demonstrated the existence of type 0 $Z_2\times Z_2$ heterotic string orbifolds in which there are no massless fermionic states. In this paper we demonstrate the existence of non--supersymmetric tachyon--free $Z_2\times Z_2$ heterotic string orbifolds that do not contain any massless bosonic states from the twisted sectors. We dub these configurations type ${\bar 0}$ models. They necessarily contain untwisted bosonic states, producing the gravitational, gauge and scalar moduli degrees of freedom, but possess an excess of massless fermionic states over bosonic ones, hence producing a positive cosmological constant. Such configurations may be instrumental when trying to understand the string dynamics in the early universe.
description: 14 pages. Standard LaTeX. No figures. Published version
Mean-field approximations of networks of spiking neurons with short-term synaptic plasticity
Creators: name: Gast, Richard
name: Knösche, Thomas R.
name: Schmidt, Helmut
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Low-dimensional descriptions of neural network dynamics are an effective tool for bridging different scales of organization of brain structure and function. Recent advances in deriving mean-field descriptions for networks of coupled oscillators have sparked the development of a new generation of neural mass models. Of notable interest are mean-field descriptions of all-to-all coupled quadratic integrate-and-fire (QIF) neurons, which have already seen numerous extensions and applications. These extensions include different forms of short-term adaptation (STA) considered to play an important role in generating and sustaining dynamic regimes of interest in the brain. It is an open question, however, whether the incorporation of pre-synaptic forms of synaptic plasticity driven by single neuron activity would still permit the derivation of mean-field equations using the same method. Here, we discuss this problem using an established model of short-term synaptic plasticity at the single neuron level, for which we present two different approaches for the derivation of the mean-field equations. We compare these models with a recently proposed mean-field approximation that assumes stochastic spike timings. In general, the latter fails to accurately reproduce the macroscopic activity in networks of deterministic QIF neurons with distributed parameters. We show that the mean-field models we propose provide a more accurate description of the network dynamics, although they are mathematically more involved. Using bifurcation analysis, we find that QIF networks with pre-synaptic short-term plasticity can express regimes of periodic bursting activity as well as bi-stable regimes. Together, we provide novel insight into the macroscopic effects of short-term synaptic plasticity in spiking neural networks, as well as two different mean-field descriptions for future investigations of such networks.
description: 15 pages, 7 figures
The sensitivity of cosmic ray air shower experiments for leptoquark detection
Creators: name: Santo, M. C. Espirito
name: Onofre, A.
name: Paulos, M.
name: Pimenta, M.
name: Romao, J. C.
name: Tome, B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Leptoquarks arise naturally in models attempting the unification of the quark and lepton sectors of the standard model of particle physics. Such particles could be produced in the interaction of high energy quasi-horizontal cosmic neutrinos with the atmosphere, via their direct coupling to a quark and a neutrino. The hadronic decay products of the leptoquark, and possibly its leptonic decay products would originate an extensive air shower, observable in large cosmic ray experiments. In this letter, the sensitivity of present and planned very high energy cosmic ray experiments to the production of leptoquarks of different types is estimated and discussed.
description: 16 pages, 8 figures
Dissociation in a polymerization model of homochirality
Creators: name: Brandenburg, A.
name: Andersen, A. C.
name: Nilsson, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Biomolecules (q-bio.BM)
subject: Other Condensed Matter (cond-mat.other)
subject: Other Quantitative Biology (q-bio.OT)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: A fully self-contained model of homochirality is presented that contains the effects of both polymerization and dissociation. The dissociation fragments are assumed to replenish the substrate from which new monomers can grow and undergo new polymerization. The mean length of isotactic polymers is found to grow slowly with the normalized total number of corresponding building blocks. Alternatively, if one assumes that the dissociation fragments themselves can polymerize further, then this corresponds to a strong source of short polymers, and an unrealistically short average length of only 3. By contrast, without dissociation, isotactic polymers becomes infinitely long.
description: 16 pages, 6 figures, submitted to Orig. Life Evol. Biosph
Quantum Tomography of Pure States with Projective Measurements Distorted by Experimental Noise
Creators: name: Czerwinski, Artur
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The article undertakes the problem of pure state estimation from projective measurements based on photon counting. Two generic frames for qubit tomography are considered -- one composed of the elements of the SIC-POVM and the other defined by the vectors from the mutually unbiased bases (MUBs). Both frames are combined with the method of least squares in order to reconstruct a sample of input qubits with imperfect measurements. The accuracy of each frame is quantified by the average fidelity and purity. The efficiency of the frames is compared and discussed. The method can be generalized to higher-dimensional states and transferred to other fields where the problem of complex vectors reconstruction appears.
description: Accepted for publication in Acta Physica Polonica A Vol 139, No. 2 (2021)
Risk factors and patterns of disruption in foster care in Ireland
Creators: name: Roe, Caroline
Publisher: name: University of Limerick
Year: 2024
Subjects: classificationCode: 52
subject: Psychology
subject: FOS: Psychology

description: Background: There is significant research on the harmful impact of placement moves on children in State care and the effect this has on outcomes for this vulnerable group. There exists, however, a deficit of research into placement disruption and the interplay between the profile of children entering care, the profile of foster carers and the capacity of carers and child welfare agencies to meet children’s needs.
Objectives: To gain a greater understanding of the profile of children entering foster care in Ireland and reasons why placements are disrupting so that the risk of placement disruption can be minimised and a child-centred approach to placement matching can be developed. In contrast to other studies, to use the views and experiences of foster carers to lend a fresh perspective to the analysis.
Methods: A retrospective, mixed methods design was employed which involved:
(1) A desktop review of Disruption Reports (n=142) submitted to and approved by 3 Foster Care Committees in the Child & Family Agency (TUSLA) over a 6-year period (2012-2018);
(2) Semi-structured interviews undertaken with a sample of foster carers (n=14);
(3) A review of relevant administrative data collected by TUSLA (including the profile of need in the child in care population) and Register of Foster Carers (including the profile of foster carers).
Findings: Analysed across four domains: child related factors; birth family related factors; foster family related factors and TUSLA related factors, the findings indicated the following:
• some foster placements, including general and relative care, are more vulnerable to disruption than others;
 • many children had experienced considerable trauma prior to entering care; 
• birth parents often struggle to come to terms with the loss of their child to care;
• traditional assessment models underestimate the range and level of need within the child in care population;
• the nature of disruptions varies according to a number of child related features (e.g., behaviour), although other factors key to Agency planning also contribute;
• Without appropriate support and training foster carers are ill-equipped to deal with the needs of highly traumatised children.
Conclusions: The findings indicate that there is a complex interplay between the needs of children entering foster care, the role of parents, the capacity of the foster carers to meet the children’s needs and the ability of the care agency to oversee and provide for vulnerable children. They point to the need for changes to assessment and decision making in child welfare and protection at first point of entry to the care system and the need for a multi-disciplinary, child-centred approach, to foster care placements.
Age spreads in star forming regions: The lithium test in the Orion Nebula Cluster
Creators: name: Palla, F.
name: Randich, S.
name: Flaccomio, E.
name: Pallavicini, R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the initial results of a study of the surface lithium abundance in a sample of low-mass members (M~0.4-1.0 Msun) of the Orion Nebula Cluster (ONC) that provide an independent clock to estimate stellar ages. We report discovery of significant depletion of lithium in four stars with estimated mass of ~0.4 Msun and age ~10Myr. Comparison with the predictions of numerical and analytical models shows excellent agreement between the isochronal age and lithium depletion time scale for two objects, the first case in lithium-poor pre-main sequence stars. Our results bear on the issue of the real age spread in the ONC and hence on the overall duration of the star formation process, indicating that the stellar population did not came into existence in a single, rapid burst.
description: Astrophysical Journal Letters, in press
Györy, István, Hörcsik, Richárd, Szilvási, József: Ungarische Barth-Bibiliographie
Creators: name: Rohkrämer, Martin
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 36 Nr. 1 (1987): Ökumenische Rundschau, Band 36, Heft 1
Conditions for propagation and block of excitation in an asymptotic model of atrial tissue
Creators: name: Simitev, Radostin D.
name: Biktashev, Vadim N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Detailed ionic models of cardiac cells are difficult for numerical simulations because they consist of a large number of equations and contain small parameters. The presence of small parameters, however, may be used for asymptotic reduction of the models. Earlier results have shown that the asymptotics of cardiac equations are non-standard. Here we apply such a novel asymptotic method to an ionic model of human atrial tissue in order to obtain a reduced but accurate model for the description of excitation fronts. Numerical simulations of spiral waves in atrial tissue show that wave fronts of propagating action potentials break-up and self-terminate. Our model, in particular, yields a simple analytical criterion of propagation block, which is similar in purpose but completely different in nature to the `Maxwell rule' in the FitzHugh-Nagumo type models. Our new criterion agrees with direct numerical simulations of break-up of re-entrant waves.
description: Revised manuscript submitted to Biophysical Journal (30 pages incl. 10 figures)
Elicitation on object and verbal position
Creators: name: Rudolph, Johnny (Soni)
name: Rudolph, Ruth (Analidele)
name: Drummond, Emily
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: nkr

description: Elicitation replicating Collins' (2017) diagnostics for VP fronting in Samoan, including VP coordination, resultatives, and object shift with respect to post-verbal particles (directionals, ina, adverbs). Corresponds to pages 46-61 in Notebook 3.
Can Brans-Dicke scalar field account for dark energy and dark matter?
Creators: name: Calik, M. Arik M. C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: By using a linearized non-vacuum late time solution in Brans-Dicke cosmology we account for the seventy five percent dark energy contribution but not for approximately twenty-three percent dark matter contribution to the present day energy density of the universe.
description: revised for typo addition and for one reference change
Measurement of the Xi-p Scattering Cross Sections at Low Energy
Creators: name: Ahn, J. K.
name: Aoki, S.
name: Chung, K. S.
name: Chung, M. S.
name: Enyo, H.
name: Fukuda, T.
name: Funahashi, H.
name: Goto, Y.
name: Higashi, A.
name: Ieiri, M.
name: Iijima, T.
name: Iinuma, M.
name: Imai, K.
name: Itow, Y.
name: Lee, J. M.
name: Makino, S.
name: Masaike, A.
name: Matsuda, Y.
name: Matsuyama, Y.
name: Mihara, S.
name: Nagoshi, C.
name: Nomura, I.
name: Park, I. S.
name: Saito, N.
name: Sekimoto, M.
name: Shin, Y. M.
name: Sim, K. S.
name: Susukita, R.
name: Takashima, R.
name: Takeutchi, F.
name: Tlusty, P.
name: Weibe, S.
name: Yakkaichi, S.
name: Yoshida, K.
name: Yoshida, M.
name: Yoshida, T.
name: Yamashita, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: In this paper we report cross-section measurements for $Ξ^-p$ elastic and inelastic scatterings at low energy using a scintillating fiber active target. Upper limit on the total cross-section for the elastic scattering was found to be 24 mb at 90% confidence level, and the total cross section for the $Ξ^-p\toΛΛ$ reaction was found to be $4.3^{+6.3}_{-2.7}$ mb. We compare the results with currently competing theoretical estimates.
description: 9 pages
Neutral $Z$ boson pair production due to radion resonance in the Randall-Sundrum model: prospects at the CERN LHC
Creators: name: Das, Prasanta Kumar
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Neutral $Z$ boson pair production due to radion resonance at the Large Hadron Collider (LHC) is an interesting process to explore the notion of warped geometry (Randall-Sundrum model). Because of the enhanced coupling of radion with a pair of gluons due to trace enomaly and top(quark) loop, the radion can provide larger event rate possibility as compared to any New Physics effect. Using the proper radion-top-antitop (with the quarks being off-shell) coupling, we obtain the correct radion production rate at LHC and explore several features of a heavier radion decaying into a pair of real $Z$ bosons which subsequently decays into charged $4 l (l=e, μ)$ leptons (the gold-plated mode). Using the signal and background event rate, we obtain bounds on radion mass $m_ϕ$ and radion vev $\vphi$ at the $5σ$, $10σ$ discovery level.
description: 17 pages, 4 figures, minor changes in the text, result unchanged. Version to appear in Phys. Rev. D
Irregular and singular loci of commuting varieties
Creators: name: Popov, Vladimir L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: Group Theory (math.GR)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14M99; 14L30; 14R20; 14L24; 17B45

description: We prove that the singular locus of the commuting variety of a noncommutative reductive Lie algebra is contained in the irregular locus and we compute the codimension of the latter. We prove that one of the irreducible components of the irregular locus has codimension 4. This yields the lower bound of the codimension of the singular locus, in particular, implies that it is at least 2. We also prove that the commuting variety is rational.
description: 15 pages Several minor corrections are implemented
Critical frequency for vortex nucleation in Bose-Fermi mixtures in optical lattices
Creators: name: Guilleumas, M.
name: Centelles, M.
name: Barranco, M.
name: Mayol, R.
name: Pi, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate within mean-field theory the influence of a one-dimensional optical lattice and of trapped degenerate fermions on the critical rotational frequency for vortex line creation in a Bose-Einstein condensate. We consider laser intensities of the lattice such that quantum coherence across the condensate is ensured. We find a sizable decrease of the thermodynamic critical frequency for vortex nucleation with increasing applied laser strength and suggest suitable parameters for experimental observation. Since 87Rb-40K mixtures may undergo collapse, we analyze the related question of how the optical lattice affects the mechanical stability of the system.
description: 5 pages, 4 figures, revtex4
Note About Non-BPS and BPS Dp-branes in Near Horizon Region of N Dk-Branes
Creators: name: Kluson, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we will consider the dynamics of BPS and non-BPS Dp-branes in the background of N Dk-branes. Our approach is based on an existence of the new symmetry of D-brane effective actions that naturally emerges in the near horizon region of the stack of N Dk-branes. Since generally this scaling symmetry is explicitly broken in the Lagrangian we will find the equation that determines the time evolution of the generator of this transformations. Then we will argue that in case when the tachyon living on the worldvolume of unstable D-brane reaches the stable minimum the time evolution of this generator can be easily determined. With the help of the knowledge of the time dependence of this charge we will determine the trajectory of the non-BPS D-brane in the near horizon region of N Dk-branes. In case of BPS Dp-brane probe we will aruge that such a broken scaling symmetry exists as well and the existence of the explicit time dependence of the generator of this symmetry can be used in the solving the equation of motion of the probe Dp-brane in the near horizon region of N Dk-branes.
description: 18 pages
The support of the logarithmic equilibrium measure on sets of revolution in $\R^3$
Creators: name: Hardin, D. P.
name: Saff, E. B.
name: Stahl, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 11K41; 70F10; 28A78

description: For surfaces of revolution $B$ in $\R^3$, we investigate the limit distribution of minimum energy point masses on $B$ that interact according to the logarithmic potential $\log (1/r)$, where $r$ is the Euclidean distance between points. We show that such limit distributions are supported only on the ``out-most'' portion of the surface (e.g., for a torus, only on that portion of the surface with positive curvature). Our analysis proceeds by reducing the problem to the complex plane where a non-singular potential kernel arises whose level lines are ellipses.
Quantum dynamical semigroups generated by noncommutative unbounded elliptic operators
Creators: name: Bahn, C.
name: Ko, C. K.
name: Park, Y. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study quantum dynamical semigroups generated by noncommutative unbounded elliptic operators which can be written as Lindblad type unbounded generators. Under appropriate conditions, we first construct the minimal quantum dynamical semigroups for the generators and then use Chebotarev and Fagnola's sufficient conditions for conservativity to show that the semigroups are conservative.
Character formulas for the operad of two compatible brackets and for the bihamiltonian operad
Creators: name: Dotsenko, Vladimir
name: Khoroshkin, Anton
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 18D50, 20C30 (Primary); 05E25, 06A11, 37K10 (Secondary)

description: We compute dimensions of the components for the operad of two compatible brackets and for the bihamiltonian operad. We also obtain character formulas for the representations of the symmetric groups and the $SL_2$ group in these spaces.
description: 24 pages, accepted by Functional Analysis and its Applications, a few typos corrected
Beckmann, Joachim: Das Wort Gottes bleibt in Ewigkeit
Creators: name: Krüger, Hanfried
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 36 Nr. 1 (1987): Ökumenische Rundschau, Band 36, Heft 1
title: Rola rzeki w ożywianiu miasta. Przykład Poznania na tle europejskich osiągnięć w kształtowaniu waterfrontów
Creators: name: Kędzierska, Kalina
name: Kaźmierczak, Bartosz
Publisher: name: Publishing House of Poznan University of Technology
Year: 2023

description: Zeszyty Naukowe Politechniki Poznańskiej. Architektura, Urbanistyka, Architektura Wnętrz, 15, 295-310
A Cohomology (p+1) Form Canonically Associated with Certain Codimension-q Foliations on a Riemannian Manifold
Creators: name: Baditoiu, Gabriel
name: Escobales, Richard H.
name: Ianus, Stere
Publisher: name: arXiv
Year: 2005
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 57R30

description: Let $(M^{n},g)$ be a closed, connected, oriented, $C^{\infty}$, Riemannian, n-manifold with a transversely oriented foliation $\boldkey F$. We show that if $\lbrace X,Y \rbrace$ are basic vector fields, the leaf component of $[X,Y]$, $\Cal{V}[X,Y]$, has vanishing leaf divergence whenever $κ\wedge χ_{\boldkey F}$ is a closed (possibly zero) de Rham cohomology (p+1)-form. Here $κ$ is the mean curvature one-form of the foliation ${\boldkey F}$ and ${χ_{\boldkey F}}$ is its characteristic form. In the codimension-2 case, $κ\wedge χ_{\boldkey F}$ is closed if and only if $κ$ is horizontally closed. In certain restricted cases, we give necessary and sufficient conditions for $κ\wedge{χ_{\boldkey F}}$ to be harmonic. As an application, we give a characterization of when certain closed 3-manifolds are locally Riemannian products. We show that bundle-like foliations with totally umbilical leaves with leaf dimension greater than or equal to two on a constant curvature manifold, with non-integrable transversal distribution, and with Einstein-like transversal geometry are totally geodesic.
description: 20 pages
An MPEG2 to ATM converter to optimize performance of VBR video broadcast over ATM networks
Creators: name: Wong, Paul
Publisher: name: University of British Columbia
Year: 2009

description: Whereas variable bit-rate (VBR) MPEG2 (Moving Pictures Expert Group) video is desirable for broadcasting applications due to its conservation of bandwidth, the resulting traffic characteristics are content-dependent and unpredictable. Before broadcasting video over an ATM (Asynchronous Transfer Mode) network, a service contract is established specifying the source traffic descriptors and the required quality of service (QoS). Usage parameter control (UPC) is performed to ensure conformity of the source traffic to its descriptors. This protects the network from misuse of resources by misbehaving sources, which can affect the QoS of other connections. For real-time variable bit-rate (rt-VBR) traffic, the key traffic descriptors for UPC are PCR (peak cell rate), MBS (maximum burst size) and SCR (sustainable cell rate). ATM cells conforming to the UPC parameters are guaranteed delivery with the specified QoS, while nonconforming cells are subject to loss when congestion occurs. As cell loss results in the degradation of the received video quality, source rate control is usually required to minimize their effects on video quality relative to human visual perception. This thesis presents a novel MPEG2-to-ATM converter for VBR video broadcast over ATM networks. It functions as an external post-coding source rate controller between any MPEG2 source (video archives, life programs, etc.) and an ATM network. Dynamic break points are employed to shape and partition the video data into high priority (HP) ATM cells which conform to the prevailing usage parameter control contract with the network, and nonconforming low priority (LP) cells which minimize the effects of cell loss due to network congestion on the subjective quality of the received video. Both high and low priority cells are transmitted over a common ATM virtual connection. Performance evaluations of actual VBR MPEG2 streams transmitted over a simulated converter and ATM network are presented to demonstrate the effectiveness of the proposed method.
The pulsating white dwarf G117-B15A: still the most stable optical clock known
Creators: name: Kepler, S. O.
name: Winget, D. E.
name: Vanderbosch, Zachary P.
name: Castanheira, Barbara Garcia
name: Hermes, J. J.
name: Bell, Keaton J.
name: Mullally, Fergal
name: Romero, Alejandra D.
name: Montgomery, M. H.
name: DeGennaro, Steven
name: Winget, Karen I.
name: Chandler, Dean
name: Jeffery, Elizabeth J.
name: Fritzen, Jamile K.
name: Williams, Kurtis A.
name: Chote, Paul
name: Zola, Staszek
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The pulsating hydrogen atmosphere white dwarf star G 117-B15A has been observed since 1974. Its main pulsation period at 215.19738823(63) s, observed in optical light curves, varies by only (5.12+/-0.82)x10^{-15} s/s and shows no glitches, as pulsars do. The observed rate of period change corresponds to a change of the pulsation period by 1 s in 6.2 million years. We demonstrate that this exceptional optical clock can continue to put stringent limits on fundamental physics, such as constraints on interaction from hypothetical dark matter particles, as well as to search for the presence of external substellar companions.
description: 14 pages, 2 figures, 2 tables. arXiv admin note: substantial text overlap with arXiv:astro-ph/0507487; replaced because Fig. 2 was overlaying text
Quasiparticle Relaxation Across a Spin Gap in the Itinerant Antiferromagnet UNiGa5
Creators: name: Chia, Elbert E. M.
name: Lee, H. J.
name: Hur, Namjung
name: Bauer, E. D.
name: Durakiewicz, T.
name: Averitt, R. D.
name: Sarrao, J. L.
name: Taylor, A. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Ultrafast time-resolved photoinduced reflectivity is measured for the itinerant antiferromagnet UNiGa$_{5}$ ($T_{N} \approx$85 K) from room temperature to 10 K. The relaxation time $τ$ shows a sharp increase at $T_{N}$ consistent with the opening of a spin gap. In addition, the temperature dependence of $τ$ below $T_{N}$ is consistent with the opening of a spin gap leading to a quasiparticle recombination bottleneck as revealed by the Rothwarf-Taylor model. This contrasts with canonical heavy fermions such as CeCoIn$_{5}$ where the recombination bottleneck arises from the hybridization gap.
description: 5 pages, 5 figures