cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Pulsating strings in $Schr_5 \times T^{1,1}$ background
Creators: name: Golubtsova, A.
name: Dimov, H.
name: Iliev, I.
name: Radomirov, M.
name: Rashkov, R. C.
name: Vetsov, T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The quest for extension of holographic correspondence to non-relativistic sectors naturally includes Schrödinger backgrounds and their field theory duals. In this paper we study the holography by probing the correspondence with pulsating strings. The case we consider is pulsating strings in five-dimensional Schrödinger space times five-torus $T^{1,1}$, which has as field theory dual a dipole CFT. First we find particular pulsating string solutions and then semi-classically quantize the theory. We obtain the wave function of the problem and thoroughly study the corrections to the energy, which by duality are supposed to give anomalous dimensions of certain operators in the dipole CFT.
description: Minor corrections, 18 pages, no figures, no tables
Vertical CVD Growth of Highly Uniform Transition Metal Dichalcogenides
Creators: name: Tang, Lei
name: Li, Tao
name: Luo, Yuting
name: Feng, Simin
name: Cai, Zhengyang
name: Zhang, Hang
name: Liu, Bilu
name: Cheng, Hui-Ming
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted great attention due to their physical and chemical properties that make them promising in electronics and optoelectronics. Because of the difficulties in controlling concentrations of solid precursors and spatially non-uniform growth dynamics, it is challenging to grow wafer-scale 2D TMDCs with good uniformity and reproducibility so far, which significantly hinders their practical use. Here we report a vertical chemical vapor deposition (VCVD) design to grow monolayer TMDCs with a uniform density and high quality over the whole wafer, and with excellent reproducibility. The use of such VCVD design can easily control the three key growth parameters of precursor concentration, gas flow and temperature, which cannot be done in currently widely-used horizontal CVD system. Statistical results show that VCVD-grown monolayer TMDCs including MoS2 and WS2 are of high uniformity and quality on substrates over centimeter size. We also fabricated multiple van der Waals heterostructures by the one-step transfer of VCVD-grown TMDC samples, owning to its good uniformity. This work opens a way to grow 2D materials with high uniformity and reproducibility on the wafer scale, which can be used for the scalable fabrication of 2D materials and their heterostructures.
description: 20 pages, 4 figures
An isoperimetric inequality for logarithmic capacity of polygons
Creators: name: Solynin, Alexander Yu.
name: Zalgaller, Victor A
Publisher: name: arXiv
Year: 2005
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: We verify an old conjecture of G. Polya and G. Szego saying that the regular n-gon minimizes the logarithmic capacity among all n-gons with a fixed area.
description: 27 pages, published version
Audiovisual Policies and International Trade: The Case of Italy
Creators: name: Andreano, Simona
name: Iapadre, Lelio
name: Andreano, Simona
name: Iapadre, Lelio
Publisher: name: Unknown
Year: 2003
Subjects: International Relations/Trade

description: This paper reviews Italian audiovisual policies, in order to assess their impact on the international position of domestic cinema and television producers. Italian audiovisual policies are characterised by a rich set of institutions, regulations and support tools, whose complexity sometimes causes problems of overlapping jurisdictions among different authorities and agencies. Their degree of market access restrictiveness appears to be relatively high, especially considering the discrimination between European and non-European producers. The economic performance of the Italian audiovisual sector has been relatively weak in the nineties, particularly for what concerns the competition with foreign producers. On the other hand, the econometric exercise presented in section 5 seems to show that, at least in the cinema sector, public subsidies have a positive impact on the domestic market share of Italian producers. This preliminary conclusion is however not enough to justify a positive assessment of Italian audiovisual policies. Many important issues require further investigations. The problems and the data presented in this paper seem to confirm the need to reform the strategy and the tools of public intervention in the audiovisual sector.
Insel Mograt – eine geographische Übersicht der größten Insel im Nil
Creators: name: Ritter, Mathias
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
Prayers attributed to Severus of Antioch
Creators: name: Yūsuf, Yūḥannā Nasīm
Publisher: name: Oriens christianus : Hefte für die Kunde des christlichen Orients
Year: 2024

description: Oriens christianus : Hefte für die Kunde des christlichen Orients, Bd. 96 (2012): Oriens christianus, Band 96
Adaptation to compressed speech in younger and older listeners
Creators: name: Lam, Wendy
Publisher: name: University of British Columbia
Year: 2009

description: The present study investigated age differences in adaptation to compressed speech using a sentence recall task. Ten younger adults (aged 20-30 years) and 10 older adults (aged 62-78 years) were presented with 15 sentences at a naturally accelerated rate of 265 wpm (68% time compression), 15 sentences at a normal rate of 180 wpm, and then another 15 sentences at 265 wpm. Participants were instructed to listen to each sentence and recall it out loud as accurately as possible. Performance was evaluated in terms of the proportion of words correctly recalled. In view of known decrements in temporal processing, working memory capacity, and processing speed with age, older adults were expected to perform more poorly than younger adults at the accelerated speech rate. However, the results revealed no age differences in performance. Rather than impairing recall as predicted, moderate acceleration of speech rate had no effect on the performance of older participants and slightly enhanced that of younger participants. The results also offered preliminary evidence of adaptation to accelerated speech by a subgroup of younger and older participants who exhibited an improvement in recall performance over the course of 15-20 sentences. Furthermore, participants who demonstrated adaptation did not return to their original unadapted performance level after they were presented with uncompressed speech. This indicates that improvement in performance over the course of exposure to rapid input may reflect a learning process. Finally, it was hypothesized that the older group would adapt at a slower rate and to a lesser extent than the younger group due to age-related deficits in temporal/perceptual and cognitive processing. Although there were such age differences in the rate and degree of adjustment among participants who demonstrated adaptation, the effects were not statistically significant.
Impact of higher-order effects on dissipative soliton in metamaterials
Creators: name: Ali, A. K. Shafeeque
name: Ullah, Malik Zaka
name: Lakshmanan, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study the influence of higher-order effects such as third order dispersion (TOD), fourth order dispersion (FOD), quintic nonlinearity (QN), self steepening (SS) and second order nonlinear dispersion (SOND) on the dynamics of dissipative soliton (DS) in metamaterials. Considering each higher-order effect as a perturbation to the system and following Lagrangian variational method, we demonstrate stable dynamics of DS as a result of the interplay between different higher-order effects. We also perform numerical analysis to confirm the analytical results.
description: Accepted for publication in Physics Letters A
A population synthesis study on the faint X-ray sources in the Galactic center region
Creators: name: Liu, X. W.
name: Li, X. D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context. Recent Chandra observations of the Galactic center region (GCR) have uncovered a population of faint discrete X-ray sources. A few theoretical works have been made to investigate the nature of these sources. Aims. We examine the contributions and luminosity functions of various kinds of candidate objects which are proposed either by previous authors or by ourselves. Methods. We conduct a population synthesis calculation based on Hurley et al.'s rapid binary evolution code. Several candidate models, i.e. wind-accreting neutron stars, intermediate polars, low mass X-ray binaries, young pulsars and massive stars with strong winds, are incorporated into our calculation. We also take the geometric effect of the accretion disk into account for Roche lobe overflow X-ray binaries. Results. Our results show that neutron star low-mass X-ray binaries contribute significantly to the observed sources. We also point out that wind-accreting neutron stars contribute negligibly to these sources due to propeller effect, and the intermediate polars play a minor role in accounting for the faint X-ray sources in both Wang et al. and Muno et al. survey. It should be mentioned that the majority of the sources in the survey field of Wang et al. are still beyond our expectation.
description: 14 pages, 6 figures and 3 tables. Accepted for publication in Astronomy & Astrophysics, language correction in process
H.U.N.E. 2008: Grabung innerhalb der Festung MOG048
Creators: name: Billig, Daniela
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
H.U.N.E. 2008: Die Festung Ras al Jazira (MOG 048) auf der Insel Mograt
Creators: name: Becker, Peter
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
Coarse-graining diblock copolymer solutions: a macromolecular version of the Widom-Rowlinson model
Creators: name: Addison, C. I.
name: Hansen, J. P.
name: Krakoviack, V.
name: Louis, A. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We propose a systematic coarse-grained representation of block copolymers, whereby each block is reduced to a single ``soft blob'' and effective intra- as well as intermolecular interactions act between centres of mass of the blocks. The coarse-graining approach is applied to simple athermal lattice models of symmetric AB diblock copolymers, in particular to a Widom-Rowlinson-like model where blocks of the same species behave as ideal polymers (i.e. freely interpenetrate), while blocks of opposite species are mutually avoiding walks. This incompatibility drives microphase separation for copolymer solutions in the semi-dilute regime. An appropriate, consistent inversion procedure is used to extract effective inter- and intramolecular potentials from Monte Carlo results for the pair distribution functions of the block centres of mass in the infinite dilution limit.
description: To be published in mol.phys(2005)
H.U.N.E. 2008: MOG034 und MOG064 – Zwei mehrperiodische urgeschichtliche Fundstellen auf dem Plateau von Karmel (Insel Mograt)
Creators: name: Schulz, Reinhold
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
Humboldt University Nubian Expedition 2008: Arbeiten auf der Insel Mograt
Creators: name: Näser, Claudia
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
Order in Binary Sequences and the Routes to Chaos
Creators: name: Lopez-Ruiz, Ricardo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Dynamical Systems (math.DS)
subject: Number Theory (math.NT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The natural order in the space of binary sequences permits to recover the $U$-sequence. Also the scaling laws of the period-doubling cascade and the intermittency route to chaos defined in that ordered set are explained. These arise as intrinsic properties of this ordered set, and independent from any consideration about dynamical systems.
description: 13 pages, 2 tables
A radiatively-quiet glitch and anti-glitch in the magnetar 1E 2259+586
Creators: name: Younes, G.
name: Ray, P. S.
name: Baring, M. G.
name: Kouveliotou, C.
name: Fletcher, C.
name: Wadiasingh, Z.
name: Harding, A. K.
name: Goldstein, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the timing and spectral properties of the soft X-ray emission from the magnetar 1E 2259+586 from January 2013, $\sim 8$ months after the detection of an anti-glitch, until September 2019, using the Neil Gehrels Swift and NICER observatories. During this time span, we detect two timing discontinuities. The first, occurring around 5 years after the April 2012 anti-glitch, is a relatively large spin-up glitch with a fractional amplitude $Δν/ν=1.24(2)\times10^{-6}$. We find no evidence for flux enhancement or change in the spectral or pulse profile shape around the time of this glitch. This is consistent with the picture that a significant number of magnetar spin-up glitches are radiatively-quiet. Approximately 1.5 years later in April 2019, 1E 2259+586 exhibited an anti-glitch with spin-down of a fractional amplitude $Δν/ν=-5.8(1)\times10^{-7}$; similar to the fractional change detected in 2012. We do not, however, detect any change to the pulse-profile shape or increase in the rms pulsed flux of the source, nor do we see any possible bursts from its direction around the time of the anti-glitch; all of which occurred during the 2012 event. Hence, similar to spin-up glitches, anti-glitches can occur silently. This may suggest that these phenomena originate in the neutron star interior, and that their locale and triggering mechanism do not necessarily have to be connected to the magnetosphere. Lastly, our observations suggest that the occurrence rate of spin-up and spin-down glitches is about the same in 1E 2259+586, with the former having a larger net fractional change.
description: Accepted for publication in the Astrophysical Journal Letters -- Acknowledgment fixed to note the correct grant number
Nondecoupling phenomena in QED in a magnetic field and noncommutative QED
Creators: name: Gorbar, E. V.
name: Hashimoto, Michio
name: Miransky, V. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The dynamics in QED in a strong constant magnetic field and its connection with the noncommutative QED are studied. It is shown that in the regime with the lowest Landau level (LLL) dominance the U(1) gauge symmetry in the fermion determinant is transformed into the noncommutative $U(1)_{nc}$ gauge symmetry. In this regime, the effective action is intimately connected with that in noncommutative QED and the original U(1) gauge Ward identities are broken (the LLL anomaly). On the other hand, it is shown that although a contribution of each of an infinite number of higher Landau levels is suppressed in an infrared region, their cumulative contribution is not (a nondecoupling phenomenon). This leads to a restoration of the original U(1) gauge symmetry in the infrared dynamics. The physics underlying this phenomenon reflects the important role of a boundary dynamics at spatial infinity in this problem.
description: 7 pages, REVTeX4
Deep rotating convection generates the polar hexagon on Saturn
Creators: name: Yadav, Rakesh Kumar
name: Bloxham, Jeremy
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Numerous land and space-based observations have established that Saturn has a persistent hexagonal flow pattern near its north pole. While observations abound, the physics behind its formation is still uncertain. Although several phenomenological models have been able to reproduce this feature, a self-consistent model for how such a large-scale polygonal jet forms in the highly turbulent atmosphere of Saturn is lacking. Here we present a 3D fully-nonlinear anelastic simulation of deep thermal convection in the outer layers of gas giant planets which spontaneously generates giant polar cyclones, fierce alternating zonal flows, and a high latitude eastward jet with a polygonal pattern. The analysis of the simulation suggests that self-organized turbulence in the form of giant vortices pinches the eastward jet, forming polygonal shapes. We argue that a similar mechanism is responsible for exciting Saturn's hexagonal flow pattern.
description: 11 pages, 4 main and 5 supplementary figures, 1 animation, 42 references
Hintzes Kategorie der Erzählung im Neuägyptischen – zwischen Stil und Grammatik
Creators: name: Satzinger, Helmut
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
مطالعه جامعه شناختی تاثیر عوامل موثر بر معیارهای همسرگزینی در بین دانشجویان دانشگاه الزهرا
Creators: name: Tavassoli, Afsaneh
name: Monirifar, Sara
Publisher: name: figshare
Year: 2020
Subjects: subject: Sociology
subject: FOS: Sociology

description: تحقیق حاضر به بررسی جامعه شناختی عوامل موثر بر معیارهای همسرگزینی در بین دانشجویان می پردازد. بر همین اساس فرضیاتی از نظریه همسان همسری و نظریه تصور از والدین استنتاج شده اند.روش تحقیق به صورت پیمایشی بوده و واحد تحلیل آن فرد می باشد جامعه آماری دانشجویان مجرد دانشگاه الزهرا در سال 1395 است.
Neue Arbeiten zu den Sekundärbildern der Großen Anlage von Musawwarat es Sufra
Creators: name: Kleinitz, Cornelia
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
Cyclic Universe à la string theory
Creators: name: Habara, Yoshinobu
name: Kawai, Hikaru
name: Ninomiya, Masao
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We shall present a model of the "cyclic universe" that can be constructed only by assuming a minimal set of properties of string theory. We clarify our viewpoint of the cyclic universe and show some attempts to mateliarize the idea as field theoretical manner.
description: Proceeding of International Workshop "Frontier of Quantum Physics" February 17(Thu.)-19(Sat.) 2005
Chaotic-like transfers of energy in Hamiltonian PDEs
Creators: name: Giuliani, Filippo
name: Guardia, Marcel
name: Martin, Pau
name: Pasquali, Stefano
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 35Bxx, 37Kxx, 37C29

description: We consider the nonlinear cubic Wave, the Hartree and the nonlinear cubic Beam equations on $T^2$ and we prove the existence of different types of solutions which exchange energy between Fourier modes in certain time scales. This exchange can be considered \emph{chaotic-like} since either the choice of activated modes or the time spent in each transfer can be chosen randomly. The key point of the construction of those orbits is the existence of heteroclinic connections between invariant objects and the construction of symbolic dynamics (a Smale horseshoe) for the Birkhoff Normal Form truncation of those equations.
Kulturerhalt und Forschung in Musawwarat es-Sufra 2008 – Ergebnisse und Erkenntnisse
Creators: name: Scheibner, Thomas
name: Mucha, Rebekka
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
Activation of PPCI team in the octogenarian and nonagenarians population: real-world single-centre experience
Creators: name: Kumar, Rajesh
name: O’Connor, Cormac
name: Kumar, Jathinder
name: Kerr, Brain
name: Malik, Ihtisham
name: Homer, Ciarrai
name: Abbas, Syed
name: Arnous, Samer
name: Ullah, Ihsan
name: Kiernan, Thomas J.
Publisher: name: University of Limerick
Year: 2024
Subjects: classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences

description: Objective Advancement in healthcare provision has led to increasing octogenarian ST elevation myocardial infarction (STEMI) presentation to hospital for early revascularisation therapies. Limited literature to date exists to suggest octogenarian STEMI population; with majority of trials excluding these age group patients. Due to an ageing population, we expect increasing rates of STEMI in the octogenarian and nonagenarian population in the future. This study seeks to identify the outcomes of patients over the age of 80 presenting with STEMI and determine the factors associated with better or worse outcome.Patients and methods This study is a single-centre retrospective observational study involving patients’ age 80 or older presenting with STEMI between January 2014 and December 2019. Patient data were collected by chart review and analysis of the local STEMI database. Standard Bayesian statistics were employed for analysis.Results 1301 patients presented with STEMI during this period. 159/1301 (12.2%) were 80 years or older that fulfilled STEMI criteria, 35/159 (22.1%) were medically managed. 107/124 (86.29%) had angiographic evidence of acute total or partial thrombotic occlusion, and 97/107 were treated with primary percutaneous coronary intervention (PPCI). The activation ECG most commonly exhibited an anterior STEMI, while inferior STEMI ECGs had the strongest positive predictive value. PPCI group had a 30-day mortality rate of 20% (p=0.07) and 1-year mortality was 22.4%. Highest mortality was observed with cardiogenic shock, low ejection fraction, higher high sensitivity cardiac troponin T and creatinine at presentation. Conservatively managed patients had significant higher mortality rate (48% vs 22.4%, p=0.005) at 1year.Conclusion Patients over the age of 80 who present with STEMI and undergo PPCI have a significantly lower mortality rate at 1 year. These patients have a 77.6% survival at 1 year, with 92.4% likelihood of discharge to home (without need for long-term nursing home care). Cardiogenic shock in this group was associated with a 1-year mortality of 87.5%. Despite the advanced age, we suggest favourable outcomes described in the absence of patients presenting with cardiogenic shock.
The CFHT open star cluster survey
Creators: name: Kalirai, Jasonjot Singh
Publisher: name: University of British Columbia
Year: 2009

description: We have used the Canada-France-Hawaii Telescope to obtain deep and accurate multi-colour photometry of 19 open star clusters in our Galaxy. The quality and size of the data set are unprecedented when compared with previous studies of open star clusters. The clusters in the survey differ in richness, age, metal content and location in the Galaxy and therefore provide a very diverse database for furthering the research in several areas of astrophysics. Some of the key issues which we address include the comparisons between the observational results and up-to-date theoretical stellar evolutionary models, star cluster dynamics, distance and age determinations, chemical evolution scenarios, and star formation histories. Of particular interest is the study of the properties of white dwarf stars, such as the initial-final mass relationship and the upper mass limit to production. The depth gained in the present survey (limiting V magnitude ~ 25) has allowed us to establish a large catalogue of white dwarf candidates, and our current spectroscopic investigations will provide the much needed observational constraints to white dwarf theoretical models. The colour-magnitude diagrams for the rich, young clusters in the survey possess very tightly constrained, long main-sequences and show a much richer cluster population than previous studies. This thesis summarizes how this was done as well as key results for the two richest clusters in the survey, NGC 6819 and NGC 2099. For NGC 6819 we find: distance = 2500 pc, age = 2.5 Gyrs, size = 9.5', and mass = 2600 M⊙. The cluster is found to be dynamically evolved and exhibits mass-segregation effects. A strong cooling trail of white dwarfs is found to be in excellent agreement with a 0.70 M⊙ theoretical white dwarf cooling model. For NGC 2099 we find: distance = 1500 pc, age = 0.5 Gyrs, size = 13.9', and mass = 2500 M⊙. The cluster exhibits some signs of dynamical evolution, although not as severe as for NGC 6819. The white dwarf cooling age of NGC 2099 is found to be in excellent agreement with the turn-off age.
Arbitrary black-string deformations in the black string-black hole transitions
Creators: name: Anderson, Matthew
name: Lehner, Luis
name: Pullin, Jorge
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the possible black string-black hole transition by analyzing the structure of the apparent horizon for a large family of time-symmetric initial data. We observe that, as judged by the apparent horizon, it is possible to generate arbitrarily deformed black strings at a moment of time symmetry. A similar study for hyperspherical black holes reveals that although arbitrarily deformed hyperspherical black holes can be constructed, the proper distance between the north and south poles along the extra direction has an upper limit.
description: 10 pages, 7 figures
Spin-1 Correlators at Large NC: Matching OPE and Resonance Theory up to O(alpha_s)
Creators: name: Sanz-Cillero, J. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The relation between the quark-gluon description of QCD and the hadronic picture is studied up to order alpha_s. The analysis of the spin-1 correlators is developed within the large NC framework. Both representations are shown to be equivalent in the euclidean domain, where the Operator Product Expansion is valid. By considering different models for the hadronic spectrum at high energies, one is able to recover the alpha_s running in the correlators, to fix the rho(770) and a1(1260) couplings, and to produce a prediction for the values of the condensates. The Operator Product Expansion is improved by the large NC resonance theory, extending its range of validity. Dispersion relations are employed in order to study the minkowskian region and some convenient sum rules, specially sensitive to the resonance structure of QCD, are worked out. A first experimental estimate of these sum rules allows a cross-check of former determinations of the QCD parameters and helps to discern and to discard some of the considered hadronical models. Finally, the truncated resonance theory and the Minimal Hadronical Approximation arise as a natural approach to the full resonance theory, not as a model.
description: 36 pages, 19 figures. Minor changes (added reference,...). Paper as finally appeared in press
Electric Wheelchair Controlled by Joystick and Android/iOS Smartphone
Creators: name: Haidie Bin Inun
name: Siagian, Caroline Dame
name: Shalizan Bin Kadir
name: Zamlan, Benny Azmi Bin Mohd
name: Syahlan Abd Halim
Publisher: name: figshare
Year: 2020
Subjects: subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A wheelchair is used by people who are difficult to walk because of having physical problems, injuries, or disabilities. There are many options and different types of wheelchairs such as manual wheelchairs, electric wheelchairs, and scooters depending on the patient’s financial ability, physical limits, and strength. Not all people with movement disabilities have enough strength especially elders. Moreover, there is no wheelchair controlled by smartphones currently available in the market and even custom-made electric wheelchairs are very expensive. Therefore, the main objective of this project is to provide a solution to this matter by modifying an existing manual wheelchair that would use smartphones (android/iOS) and joystick to control its movement. So, the rationale of this project is it can help patients with movement difficulty to move easily with significantly at a lower cost. Implementation of this project will be using System Development (SDLC) Life Cycle methodology that divide the complex task into several phases of development. This project will be divided into two parts, namely the implementation of hardware and software. The main hardware of this system consists of Arduino microcontrollers and motors that can be controlled using a smartphone via Bluetooth module and joystick. Ultrasonic sensors are located on the rear of this wheelchair to detect objects or obstacles and buzz the buzzer so that the person who uses it can be acknowledged when there are objects behind during reverse movement. The software part will consist of Arduino programming using Arduino Integrated Development Environment (IDE) software and mobile apps programming using Massachusetts Institute of Technology (MIT) App Inventor software. In the end, the implementation of this project can be used in universities, companies, hospitals, and at home as well to facilitate someone's movement without having to rely too much on help from others. In conclusion, this project is expected can help the disability and elder to move freely and control the electric wheelchair by themselves independently.
IMPACT OF A FOOD DISTRIBUTION CENTER ON PRODUCE HANDLING AND DISTRIBUTION
Creators: name: Croushorn, Ronald L.
name: Croushorn, Ronald L.
Publisher: name: Unknown
Year: 1990
Subjects: Agribusiness

description: The Maryland Wholesale Food Center is an integral part of the food distribution system in the Baltimore-Washington metropolitan area. The Food Center encompasses many segments of the food industry, including the Maryland Wholesale Produce Market, the Maryland Wholesale Seafood Market, a distribution center for a regional supermarket chain, and other independent wholesalers. This paper focuses on a comparison of characteristics and operating costs of wholesale firms located on the Food Center, firms located in other sections of the metropolitan area, and firms operating in 1964. The paper illustrates differences in product movement, distribution, and facilities among the types of firms. A major finding is that firms located on the Maryland Wholesale Produce Market are more cost efficient in several areas of operation relative to other firms. As a result, locating a food distribution center may improve the competitive position of wholesalers.
Two-temperature accretion flows in magnetic cataclysmic variables: Structures of post-shock emission regions and X-ray spectroscopy
Creators: name: Saxton, Curtis
name: Wu, Kinwah
name: Cropper, Mark
name: Ramsay, Gavin
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use a two-temperature hydrodynamical formulation to determine the temperature and density structures of the post-shock accretion flows in magnetic cataclysmic variables (mCVs) and calculate the corresponding X-ray spectra. The effects of two-temperature flows are significant for systems with a massive white dwarf and a strong white-dwarf magnetic field. Our calculations show that two-temperature flows predict harder keV spectra than one-temperature flows for the same white-dwarf mass and magnetic field. This result is insensitive to whether the electrons and ions have equal temperature at the shock but depends on the electron-ion exchange rate, relative to the rate of radiative loss along the flow. White-dwarf masses obtained by fitting the X-ray spectra of mCVs using hydrodynamic models including the two-temperature effects will be lower than those obtained using single-temperature models. The bias is more severe for systems with a massive white dwarf.
description: Accepted MNRAS
Karte des Nordsudan
Creators: name: Redaktion, Die
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 19 (2008): Der Antike Sudan
Evidence for a Rotational Component in the Circumgalactic Medium of Nearby Galaxies
Creators: name: French, David M.
name: Wakker, Bart P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present results of a study comparing the relative velocity of $\rm Lyα$ absorbers to the rotation velocity of nearby galaxy disks in the local universe ($z \leq 0.03$). We have obtained rotation curves via long-slit spectroscopy of eight galaxies with the Southern African Large Telescope, and combine this dataset with an additional 16 galaxies with data from the literature. Each galaxy appears within $3R_{\rm vir}$ of a QSO sightline with archival Cosmic Origin Spectrograph (COS) spectra. We study the velocity orientation of absorbers with respect to nearby galaxy's rotation, and compare with results from both the Steidel et al. (2002) monolithic halo model and a new cylindrical Navarro-Frenk-White galaxy halo model to interpret these data in the context of probing 3D galaxy halos via 1D QSO absorption-line spectroscopy. Relative to these models we find that up to $59\pm5\%$ of $\rm Lyα$ absorbers have velocities consistent with co-rotation. We find the $\rm Lyα$ co-rotation fraction to decrease with galaxy luminosity ($L^*$) and impact parameter in a model-independent fashion. We report that both anti-rotating absorbers and those found near luminous galaxies ($L \gtrsim 0.5 L^*$) mostly have low Doppler $b$-parameters ($b \lesssim 50$ km $\rm s^{-1}$). Absorbers consistent with co-rotation show a wide range of Doppler $b$-parameters. Finally, we find a strong anticorrelation between co-rotation fraction and galaxy inclination, which is at odds with recent metal-line kinematic studies and suggests the kinematic and geometric distribution of the circumgalactic medium is complex and multiphase.
description: 27 pages, 17 figures, accepted to ApJ
QED amplitudes: recurrence relations to all orders
Creators: name: Ilderton, Anton
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We describe the origins of recurrence relations between field theory amplitudes in terms of the construction of Feynman diagrams. In application we derive recurrence relations for the amplitudes of QED which hold to all loop orders and for all combinations of external particles. These results may also be derived from the Schwinger-Dyson equations.
description: 10 pages, 2 .eps figures. Replaced with published version - reference added, conclusion extended
Jet Structure from Dihadron Correlations in d+Au collisions at sqrt(s_NN) = 200 GeV
Creators: name: PHENIX Collaboration
name: Adler, S. S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Dihadron correlations at high transverse momentum in d+Au collisions at sqrt(s_NN) = 200 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). From these correlations we extract several structural characteristics of jets; the root-mean-squared (RMS) transverse momentum of fragmenting hadrons with respect to the jet sqrt(), the mean sine-squared angle between the scattered partons , and the number of particles produced within the dijet that are associated with a high-p_T particle (dN/dx_E distributions). We observe that the fragmentation characteristics of jets in d+Au collisions are very similar to those in p+p collisions and that there is also little dependence on the centrality of the d+Au collision. This is consistent with the nuclear medium having little influence on the fragmentation process. Furthermore, there is no statistically significant increase in the value of from p+p to d+Au collisions. This constrains the amount of multiple scattering that partons undergo in the cold nuclear medium before and after a hard-collision.
description: 330 authors, 30 pages text, RevTeX4, 42 figures, 20 tables. Submitted to Physical Review C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html
Transport of angular momentum by stochastically excited waves as an explanation for the outburst of the rapidly rotating Be star HD49330
Creators: name: Neiner, C.
name: Lee, U.
name: Mathis, S.
name: Saio, H.
name: Lovekin, C. C.
name: Augustson, K. C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: HD49330 is a Be star that underwent an outburst during its five-month observation with the CoRoT satellite. An analysis of its light curve revealed several independent p and g pulsation modes, in addition to showing that the amplitude of the modes is directly correlated with the outburst. We modelled the results obtained with CoRoT. We modelled the flattening of the structure of the star due to rapid rotation in two ways: Chandrasekhar-Milne's expansion and 2D structure computed with ROTORC. We then modelled kappa-driven pulsations. We also adapted the formalism of the excitation and amplitude of stochastically excited gravito-inertial modes to rapidly rotating stars, and we modelled those pulsations as well. We find that while pulsation p modes are excited by the kappa mechanism, the observed g modes are a result of stochastic excitation. In contrast, g and r waves are stochastically excited in the convective core and transport angular momentum to the surface, increasing its rotation rate. This destabilises the external layers of the star, which then emits transient stochastically excited g waves. These transient waves produce most of the low-frequency signal detected in the CoRoT data and ignite the outburst. During this unstable phase, p modes disappear at the surface because their cavity is broken. Following the outburst and ejection of the surface layer, relaxation occurs, making the transient g waves disappear and p modes reappear. This work includes the first coherent model of stochastically excited gravito-inertial pulsation modes in a rapidly rotating Be star. It provides an explanation for the correlation between the variation in the amplitude of frequencies detected in the CoRoT data and the occurrence of an outburst. This scenario could apply to other pulsating Be stars, providing an explanation to the long-standing questions surrounding Be outbursts and disks.
description: Accepted in A&A, 15 pages, abstract shown here has been abridged to fit Arxiv's character limit
THE PROFILE OF COGNITIVE, BEHAVIOURAL AND EMOTIONAL CHANGE WITHIN MND
Creators: name: Wicks, Paul
Publisher: name: figshare
Year: 2020
Subjects: subject: 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology)
subject: FOS: Psychology

description: AbstractMotor Neurone Disease (MND) is a rare and terminal neurodegenerative disorder which causes muscle wasting throughout the body. Whilst intellect was traditionally held to be intact, the past 20 years have revealed that this is not accurate. A subgroup of MND patients show deficits on ‘executive’ tasks of frontal lobe function such as verbal fluency or set shifting. A minority also demonstrate behavioural changes such as apathy, disinhibition, personality change, and emotional lability. The main part of the thesis project sought to compare three clinical subgroups of MND patients: Sporadic AmyotrophicLateral Sclerosis (ALS), Familial ALS, and Progressive Muscular Atrophy (PMA) on a battery of neuropsychological tests. It was hypothesised that asFamilial ALS patients are more likely than Sporadic ALS patients to suffer from a co-morbid dementia that they would be more likely to experience cognitive change. By contrast, as PMA patients have only lower motor neurone changes it was hypothesised that their performance would be within the normal range. Findings are reported and discussion undertaken of the implications fordifferential areas of neuronal vulnerability in subgroups of the MND population. As part of a smaller project, a subset of Sporadic ALS patients also underwent 11-C Flumazenil and WAY100635 Positron Emission Tomography in order to localise neuropsychological correlates of cerebral abnormalities in extra-motor regions. A second smaller project used a postal questionnaire to survey theprevalence of depressive and anxious symptomology amongst a 6 month consecutive sample of MND clinic patients in order to examine the assumption that people with MND are generally “stoical and positive”. In summary the current thesis contains a detailed examination of the profile of cognitive, behavioural and emotional change within MND.
Tetraquark and Pentaquark Systems in Lattice QCD
Creators: name: Okiharu, F.
name: Doi, T.
name: Ichie, H.
name: Iida, H.
name: Ishii, N.
name: Oka, M.
name: Suganuma, H.
name: Takahashi, T. T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Motivated by the recent experimental discoveries of multi-quark candidates, e.g., the $Θ^+(1540)$, we study multi-quark systems in lattice QCD. First, we perform accurate mass measurements of low-lying 5Q states with $J=1/2$ and I=0 in both positive- and negative-parity channels in anisotropic lattice QCD. The lowest positive-parity 5Q state is found to have a large mass of about 2.24GeV after the chiral extrapolation. To single out the compact 5Q state from $NK$ scattering states, we develop a new method with the hybrid-boundary condition (HBC), and find no evidence of the compact 5Q state below 1.75GeV in the negative-parity channel. Second, we perform the first study of the multi-quark potential in lattice QCD to clarify the inter-quark interaction in multi-quark systems. The 5Q potential $V_{\rm 5Q}$ for the QQ-${\rm \bar{Q}}$-QQ system is found to be well described by the ``OGE Coulomb plus multi-Y Ansatz": the sum of the one-gluon-exchange (OGE) Coulomb term and the multi-Y-type linear term based on the flux-tube picture. The 4Q potential $V_{\rm 4Q}$ for the QQ-${\rm \bar{Q}\bar{Q}}$ system is also described by the OGE Coulomb plus multi-Y Ansatz, when QQ and $\rm \bar Q \bar Q$ are well separated. The 4Q system is described as a "two-meson" state with disconnected flux tubes, when the nearest quark and antiquark pair is spatially close. We observe a lattice-QCD evidence for the ``flip-flop'', i.e., the flux-tube recombination between the connected 4Q state and the ``two-meson'' state. On the confinement mechanism, the lattice QCD results indicate the flux-tube-type linear confinement in multi-quark hadrons.
description: 22 pages, 3 tables, 16 figures. Talk given at International Workshop on Quark Nuclear Physics 2005 (QNP05), Phoenix Park, Korea, 22-24, Feb., 2005
Characterising continuum variability in the radio-loud narrow-line Seyfert 1 galaxy IRAS 17020+4544
Creators: name: Gonzalez, A. G.
name: Gallo, L. C.
name: Kosec, P.
name: Fabian, A. C.
name: Alston, W. N.
name: Berton, M.
name: Wilkins, D. R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present results of temporal and spectral analyses on four XMM-Newton EPIC pn observations of IRAS 17020+4544, a narrow-line Seyfert 1 galaxy with evidence of a radio jet. Analysis of the light curves reveals that this radio-loud source does not behave like the bulk population of its radio-quiet counterparts. A trend of spectral hardening with increased flux is found. Variability is found to increase with energy, though it decreases as the spectrum hardens. The first 40 ks of the most recent observation behave uniquely among the epochs, exhibiting a softer spectral state than at any other time. Possible non-stationarity at low energies is found, with no such effect present at higher energies, suggesting at least two distinct spectral components. A reverberation signature is confirmed, with the lag-frequency, lag-energy, and covariance spectra changing significantly during the soft-state epoch. The temporal analysis suggests a variable power-law in the presence of a reflection component, thus motivating such a fit for the 0.3-10 keV EPIC pn spectra from all epochs. We find an acceptable spectral fit using the timing-motivated parameters and report the detection of a broad Fe K emission line, requiring an additional model component beyond the reflection spectrum. We discuss links between this source and other narrow-line Seyfert 1 sources that show evidence of jet activity, finding similarities among this currently very limited sample of interesting objects.
description: Accepted for publication in MNRAS. 19 pages, 14 figures
A Vacuum Accumulation Solution to the Strong CP Problem
Creators: name: Dvali, Gia
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We suggest a solution to the strong CP problem in which there are no axions involved. The superselection rule of the θ-vacua is dynamically lifted in such a way that an infinite number of vacua are accumulated within the phenomenologically acceptable range of θ< 10^{-9}, whereas only a measure-zero set of vacua remains outside of this interval. The general prediction is the existence of membranes to which the standard model gauge fields are coupled. These branes may be light enough for being produced at the particle accelerators in form of the resonances with a characteristic membrane spectrum.
description: 17 pages