cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
New evidence on the origin of the microquasar GRO J1655-40
Creators: name: Combi, J. A.
name: Bronfman, L.
name: Mirabel, I. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims. Motivated by the new determination of the distance to the microquasar GRO J1655-40 by Foellmi et al. (2006), we conduct a detailed study of the distribution of the atomic and molecular gas, and dust around the open cluster NGC 6242, the possible birth place of the microquasar. The proximity and relative height of the cluster on the galactic disk provides a unique opportunity to study SNR evolution and its possible physical link with microquasar formation. Methods. We search in the interstellar atomic and molecular gas around NGC 6242 for traces that may have been left from a supernova explosion associated to the formation of the black hole in GRO J1655-40. Furthermore, the 60/100 mu IR color is used as a tracer of shocked-heated dust. Results. At the kinematical distance of the cluster the observations have revealed the existence of a HI hole of 1.5*1.5 degrees in diameter and compressed CO material acumulated along the south-eastern internal border of the HI cavity. In this same area, we found extended infrared emission with characteristics of shocked-heated dust. Based on the HI, CO and FIR emissions, we suggest that the cavity in the ISM was produced by a supernova explosion occured within NGC 6242. The lower limit to the kinematic energy transferred by the supernova shock to the surrounding interstellar medium is ~ 10^{49} erg and the atomic and molecular mass displaced to form the cavity of ~ 16.500 solar masses. The lower limit to the time elapsed since the SN explosion is ~ 2.2*10^{5} yr, which is consistent with the time required by GRO J1655-40 to move from the cluster up to its present position. The observations suggest that GRO J1655-40 could have been born inside NGC 6242, being one of the nearest microquasars known so far.
description: 6 pages, 6 figures. Accepted for publication in Astronomy & Astrophysics
Controlling transitions in a Duffing oscillator by sweeping parameters in time
Creators: name: Kogan, Oleg
Publisher: name: arXiv
Year: 2006
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We consider a high-$Q$ Duffing oscillator in a weakly non-linear regime with the driving frequency $σ$ varying in time between $σ_i$ and $σ_f$ at a characteristic rate $r$. We found that the frequency sweep can cause controlled transitions between two stable states of the system. Moreover, these transitions are accomplished via a transient that lingers for a long time around the third, unstable fixed point of saddle type. We propose a simple explanation for this phenomenon and find the transient life-time to scale as $-(\ln{|r-r_c|})/λ_r$ where $r_c$ is the critical rate necessary to induce a transition and $λ_r$ is the repulsive eigenvalue of the saddle. Experimental implications are mentioned.
description: 4 pages, 9 figures
SteaLTE: Private 5G Cellular Connectivity as a Service with Full-stack Wireless Steganography
Creators: name: Bonati, Leonardo
name: D'Oro, Salvatore
name: Restuccia, Francesco
name: Basagni, Stefano
name: Melodia, Tommaso
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Fifth-generation (5G) systems will extensively employ radio access network (RAN) softwarization. This key innovation enables the instantiation of "virtual cellular networks" running on different slices of the shared physical infrastructure. In this paper, we propose the concept of Private Cellular Connectivity as a Service (PCCaaS), where infrastructure providers deploy covert network slices known only to a subset of users. We then present SteaLTE as the first realization of a PCCaaS-enabling system for cellular networks. At its core, SteaLTE utilizes wireless steganography to disguise data as noise to adversarial receivers. Differently from previous work, however, it takes a full-stack approach to steganography, contributing an LTE-compliant steganographic protocol stack for PCCaaS-based communications, and packet schedulers and operations to embed covert data streams on top of traditional cellular traffic (primary traffic). SteaLTE balances undetectability and performance by mimicking channel impairments so that covert data waveforms are almost indistinguishable from noise. We evaluate the performance of SteaLTE on an indoor LTE-compliant testbed under different traffic profiles, distance and mobility patterns. We further test it on the outdoor PAWR POWDER platform over long-range cellular links. Results show that in most experiments SteaLTE imposes little loss of primary traffic throughput in presence of covert data transmissions (< 6%), making it suitable for undetectable PCCaaS networking.
Sloan/Johnson-Cousins/2MASS Color Transformations for Cool-Stars
Creators: name: Davenport, James R. A.
name: West, Andrew A.
name: Matthiesen, Caleb K.
name: Schmieding, Michael
name: Kobelski, Adam
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present multi-color transformations and photometric parallaxes for a sample of 40 low mass dwarfs selected from the Sloan Digital Sky Survey (SDSS) and the General Catalog of Trigonometric Stellar Parallaxes. Our sample was re-observed at the Manastash Ridge Observatory (MRO) using both Sloan and Johnson-Cousin filters and color transformations between the two photometric systems were derived. A subset of the sample had previously measured Johnson-Cousins photometry and parallaxes as well as 2MASS photometry. We observed these stars at MRO using Sloan filters and used these data to derive photometric parallax relations as well as SDSS/Johnson-Cousins/2MASS color transformations. We present the data and derived transformations for use in future low mass star studies.
description: 7 pages, Accepted for publication in PASP
Existence and continuation of periodic solutions of Newtonian systems
Creators: name: Fura, J.
name: Ratajczak, A.
name: Rybicki, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 34C25, 47H11

description: In this article we study the existence and the continuation of periodic solutions of autonomous Newtonian systems. To prove the results we apply the infinite-dimensional version of the degree for SO(2)-equivariant gradient operators. Using the results due to Rabier we show that the Leray-Schauder degree is not applicable in the proofs of our theorems, because it vanishes.
description: 31 pages
Perpendicular magnetic anisotropy in ultra-thin Cu$_2$Sb-type (Mn-Cr)AlGe films onto thermally oxidized silicon substrates
Creators: name: Kubota, Takahide
name: Ito, Keita
name: Umetsu, Rie Y
name: Takanashi, Koki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Perpendicularly magnetized films showing small saturation magnetization, $M_\mathrm{s}$, are essential for spin-transfer-torque writing type magnetoresistive random access memories, STT-MRAMs. An intermetallic compound, {(Mn-Cr)AlGe} of the Cu$_2$Sb-type crystal structure was investigated, in this study, as a material showing the low $M_\mathrm{s}$ ($\sim 300$ kA/m) and high-perpendicular magnetic anisotropy, $K_\mathrm{u}$. The layer thickness dependence of $K_\mathrm{u}$ and effects of Mg-insertion layers at top and bottom (Mn-Cr)AlGe$|$MgO interfaces were studied in film samples fabricated onto thermally oxidized silicon substrates to realize high-$K_\mathrm{u}$ in the thickness range of a few nanometer. Optimum Mg-insertion thicknesses were 1.4 and 3.0 nm for the bottom and the top interfaces, respectively, which were relatively thick compared to results in similar insertion effect investigations on magnetic tunnel junctions reported in previous studies. The cross-sectional transmission electron microscope images revealed that the Mg-insertion layers acted as barriers to interdiffusion of Al-atoms as well as oxidization from the MgO layers. The values of $K_\mathrm{u}$ were about $7 \times 10^5$ and $2 \times 10^5$ J/m$^3$ at room temperature for 5 and 3 nm-thick (Mn-Cr)AlGe films, respectively, with the optimum Mg-insertion thicknesses. The $K_\mathrm{u}$ at a few nanometer thicknesses is comparable or higher than those reported in perpendicularly magnetized CoFeB films which are conventionally used in MRAMs, while the $M_\mathrm{s}$ value is one third or less smaller than those of the CoFeB films. The developed (Mn-Cr)AlGe films are promising from the viewpoint of not only the magnetic properties, but also the compatibility to the silicon process in the film fabrication.
description: Supplementary material is available upon reasonable request to the corresponding author
Random nanowire networks: Identification of a current-carrying subset of wires using a modified wall follower algorithm
Creators: name: Tarasevich, Yuri Yu.
name: Eserkepov, Andrei V.
name: Akhunzhanov, Renat K.
name: Ulyanov, Mikhail V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We mimic random nanowire networks by the homogeneous, isotropic, and random deposition of conductive zero-width sticks onto an insulating substrate. The number density (the number of objects per unit area of the surface) of these sticks is supposed to exceed the percolation threshold, i.e., the system under consideration is a conductor. To identify any current-carrying part (the backbone) of the percolation cluster, we have proposed and implemented a modification of the well-known wall follower algorithm -- one type of maze solving algorithm. The advantage of the modified algorithm is its identification of the whole backbone without visiting all the edges. The complexity of the algorithm depends significantly on the structure of the graph and varies from $O\left(\sqrt{N_\text{V}}\right)$ to $Θ(N_\text{V})$. The algorithm has been applied to backbone identification in networks with different number densities of conducting sticks. We have found that (i) for number densities of sticks above the percolation threshold, the strength of the percolation cluster quickly approaches unity as the number density of the sticks increases; (ii) simultaneously, the percolation cluster becomes identical to its backbone plus simplest dead ends, i.e., edges that are incident to vertices of degree 1. This behavior is consistent with the presented analytical evaluations.
description: 9 pages, 9 figures, 78 references
The Laser of the ALICE Time Projection Chamber
Creators: name: Renault, G.
name: Nielsen, B. S.
name: Westergaard, J.
name: GaardhØJe, J. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The large TPC ($95 \mathrm{m}^3$) of the ALICE detector at the CERN LHC was commissioned in summer 2006. The first tracks were observed both from the cosmic ray muons and from the laser rays injected into the TPC. In this article the basic principles of operating the $266 \mathrm{nm}$ lasers are presented, showing the installation and adjustment of the optical system and describing the control system. To generate the laser tracks, a wide laser beam is split into several hundred narrow beams by fixed micro-mirrors at stable and known positions throughout the TPC. In the drift volume, these narrow beams generate straight tracks at many angles. Here we describe the generation of the first tracks and compare them with simulations.
description: QM06 poster proceedings, 6 pages, 4 figures
Matrix product state approach for a quantum system at finite temperatures using random phases and Trotter gates
Creators: name: Goto, Shimpei
name: Kaneko, Ryui
name: Danshita, Ippei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We develop a numerical method based on matrix product states for simulating quantum many-body systems at finite temperatures without importance sampling and evaluate its performance in spin 1/2 systems. Our method is an extension of the random phase product state (RPPS) approach introduced recently [T. Iitaka, arXiv:2006.14459]. We show that the original RPPS approach often gives unphysical values for thermodynamic quantities even in the Heisenberg chain. We find that by adding the operation of Trotter gates to the RPPS, the sampling efficiency of the approach significantly increases and its results are consistent with those of the purification approach. We also apply our method to a frustrated spin 1/2 system to exemplify that it can simulate a system in which the purification approach fails.
description: 10 pages, 8 figures, 1 table. Accepted version. Reference C++ codes are available at https://github.com/ShimpeiGoto/RPMPS-T
Poincare series of some pure and mixed trace algebras of two generic matrices
Creators: name: Djokovic, Dragomir Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13A50; 14L35; 20G20

description: We work over a field K of characteristic zero. The Poincare series for the algebra C_{n,2} of GL_n-invariants and the algebra T_{n,2} of GL_n-concomitants of two generic n x n matrices x and y are presented for n less than or equal 6. Both simply graded and bigraded cases are included. The cases for n at most 4 were known previously. If n=5 or 6, we show that C_{n,2} has no bigraded system of parameters. For the algebra C_{4,2} and C_{5,2} we construct a minimal set of generators and give an application to Specht's theorem on unitary similarity of two complex matrices. Five conjectures are proposed concerning the numerators and denominators of various Poincare series mentioned above. Some heuristic formulas and open problems are stated.
description: 28 pages, 12 tables
The impact of gender and ethnicity on the use of mental health services : a case study of twenty immigrant and refugee women
Creators: name: Johnson, M. Audrey
Publisher: name: University of British Columbia
Year: 2009

description: The voices and experiences of immigrant and refugee women in Canada have been conspicuously absent from policy issues, programme planning, and mental health literature. However, more immigrant and refugee women than men, from traditional cultures, are considered to have mental health needs, because of risk factors such as stress at the time of migration, and because of Canadian policies and programmes which disadvantage them. This study explores from the consumers perspective the reasons for disparate mental health service utilization between South Asian and Latin American women in Vancouver. Using a cross-sectional, exploratory, case study approach, and a feminist perspective, ten South Asian and ten Latin American women who have used mental health services were interviewed in depth. Sixty percent of the participants were survivors of violence and torture. Five Latin American women were survivors of pre-migration catastrophic stress. Their mental health needs were characterised by traumatic experiences, grieving and depression. Except for the three who were married, they had no traditional support networks. In contrast with the South Asian group they appeared to have less shame and covert behaviour. Mental illness, considered a ‘house secret’, carries great stigma in the South Asian community, and has serious ramifications for the immediate as well as the extended family. Among South Asian participants seven had been subjected to wife battering, and four of their spouses had a substance abuse problem. Their mental health needs were also triggered by traumatic experiences, grieving and depression. The more established South Asian women had extended family living in Vancouver, yet social support was still lacking. Having ‘no one to turn to’ was a pervasive theme across both groups of women; their experiences characterised by loss. Analysis of data exploring the decision to use services illustrates stages in a process of recovery from experienced violence. Post migration domestic violence and pre-migration violence have devastating, life-shattering consequences which require culturally sensitive interventions by social workers and other health care professionals. An obligatory stage in the clinical intervention process is to explore the issue of violence. Finally, policy decisions which impact upon women from ethnocultural communities in Canada must embrace a philosophy which considers well-trained, culturally-sensitive, linguistically—competent workers a priority.
Entropical Analysis of an Opinion Formation Model Presenting a Spontaneous Third Position Emergence
Creators: name: Gaudiano, Marcos E.
name: Revelli, Jorge A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Characterization of complexity within the sociological interpretation has resulted in a large number of notions, which are relevant in different situations. From the statistical mechanics point of view, these notions resemble entropy. In a recent work, intriguing non-monotonous properties were observed in an opinion dynamics Sznajd model. These properties were found to be consequences of the hierarchical organization assumed for the system, though their nature remained unexplained. In the present work we bring an unified entropical framework that provides a deeper understanding of those system features. By perfoming numerical simulations, the system track probabilistic dependence on the initial structures is quantified in terms of entropy. Several entropical regimes are unveiled. The myriad of possible system outputs is enhanced within a maximum impredictability regime. A mutual structural weakness of the initial parties could be associated to this regime, fostering the emergence of a third position.
description: 16 pages, 13 figures
Personalization for Web-based Services using Offline Reinforcement Learning
Creators: name: Apostolopoulos, Pavlos Athanasios
name: Wang, Zehui
name: Wang, Hanson
name: Zhou, Chad
name: Virochsiri, Kittipat
name: Zhou, Norm
name: Markov, Igor L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Human-Computer Interaction (cs.HC)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Large-scale Web-based services present opportunities for improving UI policies based on observed user interactions. We address challenges of learning such policies through model-free offline Reinforcement Learning (RL) with off-policy training. Deployed in a production system for user authentication in a major social network, it significantly improves long-term objectives. We articulate practical challenges, compare several ML techniques, provide insights on training and evaluation of RL models, and discuss generalizations.
description: 9 pages, 8 figures, 3 tables
MOESM8 of A lil3 chlp double mutant with exclusive accumulation of geranylgeranyl chlorophyll displays a lethal phenotype in rice
Creators: name: Li, Chunmei
name: Liu, Xin
name: Pan, Jihong
name: Guo, Jia
name: Wang, Qian
name: Chen, Congping
name: Li, Na
name: Zhang, Kuan
name: Yang, Bin
name: Sun, Changhui
name: Deng, Xiaojian
name: Wang, Pingrong
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Molecular Biology
subject: Evolutionary Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: Virology

description: Additional file 8: Figure S4. Sequence alignment of OsLIL3 and its homologues. Identical residues are boxed in black, and similar residues (â Ľ75% identical) are highlighted in gray. A black underline indicates the putative chloroplast signal peptides, a red arrow shows the mutant site of 637ys, and green underlines represent the transmembrane helices predicted by HMMTOP. The blue box shows the LHC motif based on the sequence of LHC motif. The red box shows the 11 new amino acids in the mutant Oslil3 protein. GenBank accession numbers for the respective protein sequences are as Fig. 5. (PDF 482 kb)
Quasi-conformal functions of quaternion and octonion variables, their integral transformations
Creators: name: Ludkovsky, S. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Complex Variables (math.CV)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 30G35, 44A10

description: The article is devoted to holomorphic and meromorphic functions of quaternion and octonion variables. New classes of quasi-conformal and quasi-meromorphic mappings are defined and investigated. Properties of such functions such as their residues and argument principle are studied. It is proved, that the family of all quasi-conformal diffeomorphisms of a domain form a topological group relative to composition of mappings. Cases when it is a finite-dimensional Lie group over $\bf R$ are studied. Relations between quasi-conformal functions and integral transformations of functions over quaternions and octonions are established. For this, in particular, noncommutative analogs of the Laplace and Mellin transformations are studied and used. Examples of such functions are given. Applications to problems of complex analysis are demonstrated.
description: 34 references, 41 pages
Sub-luminous X-ray Bursters Unveiled with INTEGRAL
Creators: name: Del Santo, M.
name: Sidoli, L.
name: Romano, P.
name: Bazzano, A.
name: Tarana, A.
name: Ubertini, P.
name: Federici, M.
name: Mereghetti, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In 2005 March 22nd, the INTEGRAL satellite caught a type-I X-ray burst from the unidentified source XMMU J174716.1-281048, serendipitously discovered with XMM-Newton in 2003. Based on the type-I X-ray burst properties, we derived the distance of the object and suggested that the system is undergoing a prolonged accretion episode of many years. We present new data from a Swift/XRT campaign which strengthen this suggestion. AX J1754.2-2754 was an unclassified source reported in the ASCA catalogue of the Galactic Centre survey. INTEGRAL observed a type-I burst from it in 2005, April 16th. Recently, a Swift ToO allowed us to refine the source position and establish its persistent nature.
description: To be published in AIP Proceedings - Conference 'A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments', 28 Oct - 2 Nov, St. Petersburg Beach, FL
Βιβλιογραφική Ερμηνεία των Οικονομικών κρίσεων και Ερευνα στην Αντιστάθμιση του Κινδύνου εν μέσω Χρηματοοικονομικών Κρίσεων
Creators: name: Σωτηρόπουλος, Αδαμάντιος Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Οικονομική κρίση
Αντιστάθμιση κινδύνου
Financial crisis
Hedging financial risks

description: Η εργασία αυτή έχει δύο άξονες: την ερμηνεία και τα αίτια των οικονομικών κρίσεων και την αντιστάθμιση κινδύνων και τις επιλογές που κάνουν οι επενδυτές για να μετριάσουν τον κίνδυνο εν καιρώ οικονομικών κρίσεων. Ξεκινά λέγοντας τι συνέβη το 2008 με την έναρξη της κρίσης , θίγει τους λόγους για τους οποίους έγινε η οικονομική κρίση, παρουσιάζει μοντέλα ορθόδοξης και ετερόδοξης ερμηνείας των οικονομικών κρίσεων, όπως αυτά του Krugman, του Obstfeld και των Kaminsky και Reinhart και παρουσιάζει το τρίγωνο Mundell που για πολλούς είναι η αιτία των οικονομικών κρίσεων. Στη συνέχεια, παρουσιάζει τα διάφορα είδη κινδύνου που αντιμετωπίζουν οι χρηματοοικονομικοί οργανισμοί, παρουσιάζει το ρυθμιστικό πλαίσιο για την αντιμετώπισή τους (Βασιλεία Ι, ΙΙ και ΙΙΙ) και αναφέρεται στα συνηθέστερα εργαλεία αντιστάθμισης, τις συνηθέστερες τεχνικές αντιστάθμισης, τους παράγοντες που παίζουν ρόλο στην αύξηση ή μείωση της προσπάθειας αντιστάθμισης των κινδύνων αυτών και μιλά για το τι έγινε στην Αμερική, την Ευρώπη και την Ελλάδα με τα hedge funds. Τέλος, αναφέρεται στο πώς γινόταν η μέτρηση ρίσκου πριν και κατά τη διάρκεια της κρίσης, ποιοι είναι οι παράγοντες που λαμβάνονται υπόψη για την αντιστάθμιση των κινδύνων βάσει διαφόρων ερευνών και παρουσιάζει στρατηγικές αντιστάθμισης από την κρίση και μετά δείχνοντας ποιες διαφορές προέκυψαν στην αντιστάθμιση ρίσκου λόγω των κρίσεων
description: This paper has two aims: first to interpret and mention the reasons why financial crises occur and second to investigate the investors’ choices in order to eliminate risk during financial stress. It begins by saying what happened in 2008 when the crisis began, mentions the reasons of the economic crisis, presents orthodox models and heterodox models of financial crises’ interpretation, like Krugman’s, Obstfeld’s and Kaminsky and Reinhart’s and presents the Mundell triangle, which is, for many, the main reason why economic crises occur. Next, it presents various types of risks that financial organizations face, presents the regulations with which they are faced in the bank industry (Basel I, II and III) and mentions the most common hedging instruments, the most common hedging techniques and the factors that increase or decrease the use of these instruments and it talks about what happened in USA, Europe and Greece with hedge funds. Last but not least, it refers to how risk assessment was done before the crisis and how that changed because of the crisis, it mentions the factors that are taken into account for risk hedging based on various papers and it presents the most principal hedging strategies since the crisis hit showing what differences they had compared to previously
title: Memoria poetica e poesia della memoria
title: La versificazione epigrafica dall’antichità all’umanesimo
titleType: Subtitle
Creators: name: Pistellato, Antonio
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2015

description: Il volume raccoglie e offre al lettore i contributi di undici specialisti, variamente impegnati sul fronte della poesia epigrafica, convenuti a Venezia nel maggio 2012 nell’incontro di studi Memoria poetica e poesia della memoria per trattare, secondo le rispettive esperienze e metodologie, il tema comune della formazione e della continuità di una tradizione espressiva e letteraria nell’ambito delle scritture esposte dall’Antichità all’Umanesimo.
description: Studi di archivistica, biblioteconomia, paleografia, volume 3
Constraints on Einstein-Maxwell dilaton-axion gravity from X-ray reflection spectroscopy
Creators: name: Tripathi, Ashutosh
name: Zhou, Biao
name: Abdikamalov, Askar B.
name: Ayzenberg, Dimitry
name: Bambi, Cosimo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Einstein-Maxwell dilaton-axion gravity is a string-inspired model arising from the low energy effective action of heterotic string theory and an important candidate as alternative to General Relativity. Recently, some authors have explored its astrophysical implications in the spectra of accreting black holes and inferred the constraint $r_2 < 0.1$, where $r_2 \ge 0$ is the black hole dilaton charge and General Relativity is recovered for $r_2 = 0$. In the present paper, we study the impact of a non-vanishing black hole dilaton charge on the reflection spectrum of the disk. From the analysis of a NuSTAR spectrum of the black hole binary EXO 1846-031, we find the constraint $r_2 < 0.011$ (90% CL), which is an order of magnitude more stringent.
description: 8 pages, 5 figures. v2: refereed version
Spontaneous CP Violation in a SUSY Model with a complex CKM
Creators: name: Branco, G. C.
name: Emmanuel-Costa, D.
name: Romao, J. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is pointed out that the recent measurement of the angle $γ$ of the unitarity triangle, providing irrefutable evidence for a complex Cabibbo-Kobayashi-Maskawa (CKM) matrix, presents a great challenge for supersymmetric models with spontaneous CP violation. We construct a new minimal extension of the minimal supersymmetric standard model (MSSM), with spontaneous CP breaking, which leads to a complex CKM matrix, thus conforming to present experimental data. This is achieved through the introduction of two singlet chiral superfields and a vector-like quark chiral superfield which mixes with the standard quarks. A $Z_3$ symmetry is introduced in order to have a potential solution to the strong CP problem.
description: 12 pages. Uses the elsart.cls LaTeX class. Minor corrections and references added
TellTable Spreadsheet Audit: from Technical Possibility to Operating Prototype
Creators: name: Nash, John
name: Adler, Andy
name: Smith, Neil
Publisher: name: arXiv
Year: 2008
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: D.1.7; D.2.1; D.2.11; D.3.2; H.4.1; K.6.4; K.8.1

description: At the 2003 EuSpRIG meeting, we presented a framework and software infrastructure to generate and analyse an audit trail for a spreadsheet file. This report describes the results of a pilot implementation of this software (now called TellTable; see www.telltable.com), along with developments in the server infrastructure and availability, extensions to other "Office Suite" files, integration of the audit tool into the server interface, and related developments, licensing and reports. We continue to seek collaborators and partners in what is primarily an open-source project with some shared-source components.
description: 11 pages
Improved tests on the relationship between the kinetic energy of galaxies and the mass of their central black holes
Creators: name: Feoli, A.
name: Mele, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We support, with new fitting instruments and the analysis of more recent experimental data, the proposal of a relationship between the mass of a Supermassive Black Hole (SMBH) and the kinetic energy of random motions in the host elliptical galaxy. The first results obtained in a previous paper with 13 elliptical galaxies are now confirmed by the new data and an enlarged sample. We find $M_{BH} \propto (M_{G} σ^{2}/c^2)^β$ with $0.8 \leq β\leq 1$ depending on the different fitting methods and samples used. The meaningful case $β= 1$ is carefully analyzed. Furthermore, we test the robustness of our relationship including in the sample also lenticular and spiral galaxies and we show that the result does not change. Finally we find a stronger correlation between the mass of the galaxy and the corresponding velocity dispersion that allows to connect our relationship to the $M_{BH} \propto σ^α$ law. With respect to this law, our relationship has the advantage to have a smaller scatter.
description: 17 pages, 3 figures, accepted for publication in IJMPD
Evolution of concentration under lattice spin-flip dynamics
Creators: name: Chazottes, J. -R.
name: Collet, P.
name: Redig, F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider spin-flip dynamics of configurations in $\{-1,1\}^{\mathbb{Z}^d}$, and study the time evolution of concentration inequalities. For "weakly interacting" dynamics we show that the Gaussian concentration bound is conserved in the course of time and it is satisfied by the unique stationary Gibbs measure. Next we show that, for a general class of translation-invariant spin-flip dynamics, it is impossible to evolve in finite time from a low-temperature Gibbs state towards a measure satisfying the Gaussian concentration bound. Finally, we consider the time evolution of the weaker uniform variance bound, and show that this bound is conserved under a general class of spin-flip dynamics.
description: 25 pages, to appear in J. Stat. Phys. (2021)
Gravitational Waves with Colliding or Non--Colliding Wave Fronts
Creators: name: Hogan, Peter A.
name: Puetzfeld, Dirk
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The known exact solutions of Einstein's vacuum field equations modeling the gravitational fields of pure gravitational radiation involve wave fronts which are either planar or roughly spherical. We describe a scheme designed to check explicitly whether or not the wave fronts collide. From the spacetime point of view the scheme determines whether or not the null hypersurface histories of the wave fronts intersect and, in particular, allows easy identification of the cases in which the null hypersurfaces do not intersect.
description: 8 pages, 1 figure
Pre-service teachers’ conceptions of multiculturalism
Creators: name: Jung, Carrie S. Y.
Publisher: name: University of British Columbia
Year: 2009

description: Teachers play an important role in implementing multicultural curricula. This role has been acknowledged by many writers, but none has systematically investigated teachers' conceptions of multiculturalism. The present study is an investigative research of pre-service teachers' conceptions of multiculturalism and the relationship between their background characteristics and their conceptions. A literature review identified five distinct conceptions of multiculturalism, distinct from one another in their views of nationhood, cultural preservation, group relations and the role of education. Using these conceptions as a framework, the researcher developed an instrument, consisting of five subscales, to measure conceptions of multiculturalism. The research instrument comprised 63 items on a four-point Likert scale (strongly agree, agree, disagree, strongly disagree), and eight questions concerning background variables such as age, sex, program of study and ancestry. The data analysis showed the instrument to be internally consistent. An exploratory factor analysis supported the distinctiveness of the conceptions identified by the researcher. Multiple univariate analyses showed that sex was a significant variable at p < .006 for four of the five subscales. One implication of this finding is that gender, that is, sex roles and socialization, may, in fact, influence how an individual conceptualizes multiculturalism.
Extreme Properties Of GRB061007: A Highly Energetic OR Highly Collimated Burst?
Creators: name: Schady, P.
name: De Pasquale, M.
name: Cummings, J.
name: Page, M. J.
name: Pandey, S. B.
name: Wang, X. Y.
name: Vetere, L.
name: Zhang, B.
name: Zane, S.
name: Breeveld, A.
name: Burrows, D. N.
name: Gehrels, N.
name: Gronwall, C.
name: ger, S. Hunsber
name: Markwardt, C.
name: Mason, K. O.
name: Meszaros, P.
name: Oates, S. R.
name: Pagani, C.
name: Poole, T. S.
name: Roming, P. W. A.
name: Smith, P.
name: Berk, D. E. Vanden
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: %auto-ignore This paper has been withdrawn by the authors due to dublicate submission. To download the paper please go to astro-ph/0611081
description: This paper has been withdrawn
Entropy function from the Einstein boundary term
Creators: name: Chowdhury, Anirban Roy
name: Saha, Ashis
name: Gangopadhyay, Sunandan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show using the entropy function formalism developed by Sen \cite{Sen:2005wa} that the boundary term which arises from the Einstein-Hilbert action is sufficient to yield the Bekenstein-Hawking entropy of a static extremal black hole which is asymptotically flat. However, for asymptotically $AdS$ black holes, the bulk term also plays an important role due to the presence of the cosmological constant. Further, we show that for extremal rotating black holes, both the boundary and the bulk terms contribute non-vanishing pieces to the entropy.
description: v1: 9 pages LaTex, v2: 10 pages LaTex (to appear in Europhysics Letters)
Magnetic structure of Cd-doped CeCoIn5
Creators: name: Nicklas, M.
name: Stockert, O.
name: Park, Tuson
name: Habicht, K.
name: Kiefer, K.
name: Pham, L. D.
name: Thompson, J. D.
name: Fisk, Z.
name: Steglich, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The heavy fermion superconductor CeCoIn5 is believed to be close to a magnetic instability, but no static magnetic order has been found. Cadmium doping on the In-site shifts the balance between superconductivity and antiferromagnetism to the latter with an extended concentration range where both types of order coexist at low temperatures. We investigated the magnetic structure of nominally 10% Cd-doped CeCoIn5, being antiferromagnetically ordered below T_N=3 K and superconducting below T_c=1.3 K, by elastic neutron scattering. Magnetic intensity was observed only at the ordering wave vector Q_AF = (1/2,1/2,1/2) commensurate with the crystal lattice. Upon entering the superconducting state the magnetic intensity seems to change only little. The commensurate magnetic ordering in CeCo(In1-xCdx)5 is in contrast to the incommensurate antiferromagnetic ordering observed in the closely related compound CeRhIn5. Our results give new insights in the interplay between superconductivity and magnetism in the family of CeTIn5 (T=Co, Rh, and Ir) based compounds.
description: 4 pages, 4 figures
E-GOVERNANCE ADOPTION IN GOVERNMENT ORGANIZATION OF INDIA
Creators: name: IJMVSC
Publisher: name: Zenodo
Year: 2024

description: India, the growing economic super-power proceeded with lightning speed towards the adoption and successful implementation of e-governance. The Government of West Bengal (federal unit of India) implemented e-governance in pension office i.e. Pension Management System (PMS), for faster and efficient delivery of public services. The success of PMS is dependent on many factors and one among them is the successful adoption by the employee which has been empirically analyzed. The study used the Technology Acceptance Model (TAM) and Trust to build a conceptual model. Data collected from 60 employees working on the system and the model is assessed with regression analyses. The findings show that the determinants of the research model are support. The study also shows that the system doesn’t perform completely error free tasks which the Government of West Bengal should address. This is the first study of employee adoption of e-governance in pension office of India.
Weighted empirical likelihood in some two-sample semiparametric models with various types of censored data
Creators: name: Ren, Jian-Jian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62N02, 62N03, 62N01 (Primary)

description: In this article, the weighted empirical likelihood is applied to a general setting of two-sample semiparametric models, which includes biased sampling models and case-control logistic regression models as special cases. For various types of censored data, such as right censored data, doubly censored data, interval censored data and partly interval-censored data, the weighted empirical likelihood-based semiparametric maximum likelihood estimator $(\tildeθ_n,\tilde{F}_n)$ for the underlying parameter $θ_0$ and distribution $F_0$ is derived, and the strong consistency of $(\tildeθ_n,\tilde{F}_n)$ and the asymptotic normality of $\tildeθ_n$ are established. Under biased sampling models, the weighted empirical log-likelihood ratio is shown to have an asymptotic scaled chi-squared distribution for censored data aforementioned. For right censored data, doubly censored data and partly interval-censored data, it is shown that $\sqrt{n}(\tilde{F}_n-F_0)$ weakly converges to a centered Gaussian process, which leads to a consistent goodness-of-fit test for the case-control logistic regression models.
description: Published in at http://dx.doi.org/10.1214/009053607000000695 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Degenerate bifurcation points of periodic solutions of autonomous Hamiltonian systems
Creators: name: Radzki, W.
name: Rybicki, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 34C23, 34C25, 58F14, 70H05

description: We study connected branches of non-constant {$2π$-pe}riodic solutions of the Hamilton equation \begin{displaymath} \dot{x}(t)=λJ\nabla H(x(t)), \end{displaymath} where $λ\in\halfline,$ $H\in C^2(\R^n\times\R^n,\R)$ and $ \displaystyle \nabla^2H(x_0)= [ \begin{array}{cc} A&0 0&B \end{array} ] $ for $x_0\in\nabla H^{-1}(0).$ The Hessian $\nabla^2H(x_0)$ can be singular. We formulate sufficient conditions for the existence of such branches bifurcating from given $(x_0,λ_0).$ As a consequence we prove theorems concerning the existence of connected branches of arbitrary periodic nonstationary trajectories of the Hamiltonian system $\dot{x}(t)=J\nabla H(x(t))$ emanating from $x_0.$ We describe also minimal periods of trajectories near $x_0.$
description: 18 pages
Twisting or untwisting graphene twisted nanoribbons without rotation
Creators: name: Fonseca, Alexandre F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The common sense regarding twisting or untwisting a ribbon is that it requires the application of an external rotation to happen. However, at nanoscale, the application of precise amounts of rotation on a nanoribbon is not a trivial task. Here, the concept of an alternative method to add twist to or remove twist from a twisted graphene nanoribbon (TGNR) without rotation is presented. The method consists of suspending a TGNR on two separate substrates and by changing only their distance, the total amount of twist of the TGNR is shown to change. The possibility to fine-tuning the amount of twist of a TGNR is also shown. The concept is demonstrated through fully atomistic molecular dynamics simulations and numerical calculations of the topological parameters twist and writhe of a TGNR. It is shown that the above process satisfies the so-called linking number theorem of space curves. Besides being experimentally feasible, this concept reveals a new kind of twist to writhe transition phenomenon that is tension-free and does not require controlling neither the nanoribbon end-to-end distance nor its critical twist density.
description: This is the submitted version of the paper, that was published in PRB
Quark-gluon vertex from Nf=2 lattice QCD
Creators: name: Kızılersü, Ayşe
name: Oliveira, Orlando
name: Silva, Paulo J.
name: Skullerud, Jon-Ivar
name: Sternbeck, André
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the quark-gluon vertex in the limit of vanishing gluon momentum using lattice QCD with 2 flavors of O(a) improved Wilson fermions, for several lattice spacings and quark masses. We find that all three form factors in this kinematics have a significant infrared strength, and that both the leading form factor $λ_1$, multiplying the tree-level vertex structure, and the scalar, chiral symmetry breaking form factor $λ_3$ are significantly enhanced in the infrared compared to the quenched (Nf=0) case. These enhancements are orders of magnitude larger than predicted by one-loop perturbation theory. We find only a weak dependence on the lattice spacing and quark mass.
description: 24 pages, many figures. Minor changes, matches version published in Phys.Rev.D
Are Swift gamma-ray bursts consistent with the Ghirlanda relation?
Creators: name: Campana, S.
name: Guidorzi, C.
name: Tagliaferri, G.
name: Chincarini, G.
name: Moretti, A.
name: Rizzuto, D.
name: Romano, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A few tight correlations linking several properties of gamma-ray bursts (GRBs), namely the spectral peak energy, the total radiated energy, and the afterglow break time, have been discovered with pre-Swift GRBs. They were used to constrain the cosmological parameters, together with type-Ia supernovae. However, the tightness of these correlations is a challenge to GRB models. We explore the effect of adding Swift bursts to the Ghirlanda and Liang-Zhang relations. Although they are both still valid, they become somewhat weakened mostly due to the presence of significant outliers, which otherwise are apparently normal GRBs so difficult to distinguish. The increased dispersion of the relations makes them less reliable for purposes of precision cosmology.
description: Paper accepted for publication on A&A (7 pages, 2 figures). Small changes after comments
MOESM9 of A lil3 chlp double mutant with exclusive accumulation of geranylgeranyl chlorophyll displays a lethal phenotype in rice
Creators: name: Li, Chunmei
name: Liu, Xin
name: Pan, Jihong
name: Guo, Jia
name: Wang, Qian
name: Chen, Congping
name: Li, Na
name: Zhang, Kuan
name: Yang, Bin
name: Sun, Changhui
name: Deng, Xiaojian
name: Wang, Pingrong
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Plant Biology
subject: Computational Biology

description: Additional file 9: Figure S5. Predicted transmembrane domain of the OsLIL3 (LOC_Os02g03330) protein. (PDF 201 kb)