cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Spread of Infectious Disease with Household-Structure on the Complex Networks
Creators: name: Liu, Jingzhou
name: Wu, Jinshan
name: Yang, Z. R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: In this paper we study the household-structure SIS epidemic spreading on general complex networks. The household structure gives us the way to distinguish inner and the outer infection rate. Unlike household-structure models on homogenous networks, such as regular and random networks, here we consider heterogeneous networks with arbitrary degree distribution p(k). First we introduce the epidemic model. Then rate equations under mean field appropriation and computer simulations are used here to analyze our model. Some unique phenomena only existing in divergent network with household structure is found, while we also get some similar conclusions that some simple geometrical quantities of networks have important impression on infection property of infectous disease. It seems that in our model even when local cure rate is greater than inner infection rate in every household, disease still can spread on scale-free network. It implies that no disease is spreading in every single household, but for the whole network, disease is spreading. Since our society network seems like this structure, maybe this conclusion remind us that during disease spreading we should pay more attention on network structure than local cure condition.
description: 12 pages, 2 figures
Local RR Lyrae Stars: native and alien
Creators: name: Zinn, R.
name: Chen, X.
name: Layden, A. C.
name: Casetti-Dinescu, D. I.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Measurements of [Fe/H] and radial velocity are presented for 89 RR Lyrae (RRL) candidates within 6 kpc of the Sun. After removal of two suspected non-RRL, these stars were added to an existing database, which yielded 464 RRL with [Fe/H] on a homogeneous scale. Using data from the Gaia satellite (Data Release 2), we calculated the positions and space velocities for this sample. These data confirm the existence of a thin-disc of RRL with [alpha/Fe] ~ solar. The majority of the halo RRL with large total energies have near zero angular momenta about the Z axis. Kinematically these stars closely resemble the Gaia-Sausage/Gaia-Enceladus stars that others have proposed are debris from the merger of a large galaxy with the Milky Way. The metallicity and period distributions of the RRL and their positions in the period-amplitude diagram suggest that this disrupted galaxy was as massive as the Large Magellanic Cloud and possibly greater.
description: 18 pages, 13 figures
Fermi level tuning and atomic ordering induced giant anomalous Nernst effect in Co2MnAl1-xSix Heusler alloy
Creators: name: Sakuraba, Y.
name: Hyodo, K.
name: Sakuma, A.
name: Mitani, S.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Co2MnAl has been predicted to have Weyl points near Fermi level which is expected to give rise to exotic transverse transport properties such as large anomalous Hall(AHE) and Nernst effects(ANE) due to large Berry curvature. In this study, the effect of Fermi level position and atomic ordering on AHE and ANE in Co2MnAl1-xSix were studied systematically. The Co2MnAl film keeps B2-disordred structure regardless of annealing temperature, which results in much smaller anomalous Hall conductivity sigma_xy and transverse Peltier coefficient sigma_xy than those calculated for L21-ordered Co2MnAl. Our newly performed calculation of sigma_xy with taking B2 disordering into account well reproduces experimental result, thus it was concluded that Berry curvature originating from Weyl points is largely reduced by B2 disordering. It was also revealed Al substitution with Si shifts the position of Fermi level and improves the L21-atomic ordering largely, leading to strong enhancement of sigma_xy, which also agreed with our theoretical calculation. The highest thermopower of ANE of 6.1uV, which is comparable to the recent reports for Co2MnGa, was observed for Co2MnAl0.63Si0.37 because of dominant contribution of sigma_xy. This study clearly shows the importance of both Fermi level tuning and high atomic ordering for obtaining the effect of topological feature in Co-based Heusler alloys on transverse transport properties.
description: 5 figures. arXiv admin note: text overlap with arXiv:1807.02209
Tropicis brevicarinatus Scott 1926
Creators: name: Lopes-Andrade, Cristiano
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Ciidae
Tropicis
Tropicis brevicarinatus

description: Tropicis brevicarinatus Scott, 1926
Diagnosis and comments
 As mentioned by Scott (1926), it differs from the other Tropicis mainly by the short elytral keels. In Trop. cuccodoroi sp. nov the elytral keels are almost indistinct.
Specimen examined No specimen examined.
Host-fungi Unknown.
Distribution Western Indian Ocean, Seychelles (Fig. 158).
description: Published as part of Lopes-Andrade, Cristiano, 2008, An essay on the tribe Xylographellini (Coleoptera: Tenebrionoidea: Ciidae), pp. 1-110 in Zootaxa 1832 (1) on page 42, DOI: 10.11646/zootaxa.1832.1.1, http://zenodo.org/record/5126979
title: Analysis of Single Circulating Tumor Cells (CTCs) to Infer Phenotype and Genome Changes in Response to Therapeutic Pressures in Biliary Tract Cancer
Creators: name: Reduzzi, Carolina
Publisher: name: The Open University
Year: 2020

description: Biliary tract cancer (BTC) is a highly fatal disease mainly treated with standard chemotherapy, albeit with limited efficacy. New therapeutic options are greatly needed, but the use of targeted treatments is often prevented by the impossibility of obtaining tissue biopsies for molecular characterization. Circulating tumor cells (CTCs) could represent a valuable alternative to tissue biopsies, also allowing a real-time monitoring of disease evolution and therapeutic resistance. Unfortunately, by using conventional CTC detection methods, which are based on the expression of epithelial markers, CTCs have been detected in only a small proportion of BTC patients, thus limiting their implementation in BTC clinical management.

 Here, we developed a protocol for the identification of not only the classic epithelial CTCs (eCTCs), but also of non-conventional CTCs (ncCTCs) lacking epithelial and leukocyte markers, but presenting aberrant genomes, and therefore representing bona fide CTCs. CTCs were analyzed in 41 blood samples longitudinally collected from 21 patients with BTC. The detection of ncCTCs in addition to eCTCs resulted in an increase in CTC-positivity from 19% to 83%. The presence of at least 1 eCTC/10 mL of blood at baseline was associated with a significantly shorter median disease-specific survival (9 months vs. 17 months, p=0.03). Conversely, ncCTCs were not prognostic but variations in their number during treatment mirrored patient response, supporting their role for treatment monitoring.

 The developed workflow also allowed the molecular characterization of single-CTCs. Copy number alteration profiling was performed for 88 single-CTCs collected from 23 BTC patients. Unsupervised clustering analysis revealed a segregation of CTCs according to patient best response and allowed the identification of genomic regions possibly involved in mechanisms of therapeutic resistance.

 Overall, our results demonstrate the presence of a novel subpopulation of CTCs in BTC, paving the way for the use of liquid biopsy to improve clinical management of BTC patients.
Collapses and explosions in self-gravitating systems
Creators: name: Ispolatov, I.
name: Karttunen, M.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Collapse and reverse to collapse explosion transition in self-gravitating systems are studied by molecular dynamics simulations. A microcanonical ensemble of point particles confined to a spherical box is considered; the particles interact via an attractive soft Coulomb potential. It is observed that the collapse in the particle system indeed takes place when the energy of the uniform state is put near or below the metastability-instability threshold (collapse energy), predicted by the mean-field theory. Similarly, the explosion in the particle system occurs when the energy of the core-halo state is increased above the explosion energy, where according to the mean field predictions the core-halo state becomes unstable. For a system consisting of 125 -- 500 particles, the collapse takes about $10^5$ single particle crossing times to complete, while a typical explosion is by an order of magnitude faster. A finite lifetime of metastable states is observed. It is also found that the mean-field description of the uniform and the core-halo states is exact within the statistical uncertainty of the molecular dynamics data.
description: 9 pages, 14 figures
Local Electric Field Measurement in GaN Diodes by exciton Franz-Keldysh Photocurrent Spectroscopy
Creators: name: Verma, Darpan
name: Adnan, Md Mohsinur Rahman
name: Rahman, Mohammad Wahidur
name: Rajan, Siddharth
name: Myers, Roberto C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The eXciton Franz-Keldysh (XFK) effect is observed in GaN p-n junction diodes via the spectral variation of photocurrent responsivity data that redshift and broaden with increasing reverse bias. Photocurrent spectra are quantitatively fit over a broad photon energy range to an XFK model using only a single fit parameter that determines the lineshape, the local bias ($V_{l}$), uniquely determining the local electric field maximum and depletion widths. As expected, the spectrally determined values of $V_{l}$ vary linearly with the applied bias ($V$) and reveal a large reduction in the local electric field due to electrostatic non-uniformity. The built-in bias ($V_{bi}$) is estimated by extrapolating $V_{l}$ at $V=0$, which compared with independent C-V measurements indicates an overall $\pm$0.31 V accuracy of $V_{l}$. This demonstrates sub-bandgap photocurrent spectroscopy as a local probe of electric field in wide bandgap diodes that can be used to map out regions of device breakdown (hot spots) for improving electrostatic design of high voltage devices.
description: 27 pages, 13 figures
title: Preclinical In Vivo Antitumor Activity Experiments: Methodological Pitfalls and a New Framework for their Design and Analysis
Creators: name: Porcu, Luca
Publisher: name: The Open University
Year: 2020

description: Aims: Poorly designed, analyzed and reported preclinical in vivo experiments (inVivoExp) raise ethical as well as scientific concerns. It could be hypothesized that the recurring failure of apparently promising interventions to improve outcome in clinical trials has been partially caused by poor quality of statistical design and analysis (QoStat) of inVivoExp. This project aimed to assess and correlate QoStat with clinical activity, and to improve the statistical framework used in inVivoExp.

 Methods: A systematic search of Medline and EMBASE databases was carried out to identify epithelial ovarian cancer clinical trials assessing the antitumor activity of candidate compounds (CC) as monotherapy. For each eligible CC, a systematic search was carried out to identify scientific papers reporting inVivoExp on rats and mice, in which the CC was administered as monotherapy. An ad hoc checklist was used to assess QoStat of inVivoExp. QoStat was correlated to the clinical activity.

 Results: Fifty-two eligible CCs and 121 inVivoExp were identified. In 45 out of 120 (37.5%) inVivoExp the method of treatment assignment was not specified. The randomization type was specified in 3 out of 74 (4.1%) inVivoExp and sample size was justified in 9 (7.4%) inVivoExp. If the primary outcome was tumor volume, the antitumor activity endpoint was declared in 14 out of 106 (13.2%) inVivoExp. The length of follow-up was specified in 43 (35.5%) inVivoExp. Outcome assessor was blinded in 5 (4.1%) inVivoExp. Inefficient statistical methods were often applied to analyze tumor growth data. A new statistical framework based on the Mann-Whitney statistic was proposed and applied to a specific tumor model.

 Conclusions: QoStat of inVivoExp was so poor that the correlation with clinical activity was impossible. The magnitude of the biological signal was poorly estimated. The new statistical framework should be considered for the design and analysis of in vivo tumor growth studies.
title: The political economy of european monetary integration
Creators: name: Spaventa, Luigi
Publisher: name: PSL Quarterly Review
Year: 2013
Subjects: subject: European Monetary Union, euro, political economy
subject: D72, F55, N14

description: Article originally published in Banca Nazionale del Lavoro Quarterly Review, vol. 42 n. 172, March 1990, pp. 3-20. Text of the speech of the 1989 Einaudi lecture. The launch of the EMS, far from being the result of deep economic thinking, was the somewhat unexpected outcome of political initiative. The rather casual economic debate that took place at the time is appraised by examining some problems that were at the centre of the negotiations in 1978. Some economic and technical arguments used in the debate were either correct, but missing the political point, or irrelevant. On the other hand, when the EMS belatedly started in March 1979, much of the political glamour had gone. Ten years of EMS have witnessed a subtler and more interesting form of interaction between politics and economics. JEL Codes: D72, F55, N14
description: PSL Quarterly Review, V. 66, N. 266 (2013)
A lower bound for the canonical height on elliptic curves over abelian extensions
Creators: name: Silverman, Joseph H.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Number Theory (math.NT)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 11G05 (Primary) 11G10, 14G25, 14K15 (Secondary)

description: Let E/K be an ellptic curve defined over a number field, let h be the canonical height on E, and let K^ab be the maximal abelian extension of K. Extending work of M. Baker, we prove that there is a positive constant C(E/K) so that every nontorsion point P in E(K^ab) satisfies h(P) > C(E/K).
Rational functions with real critical points and the B. and M. Shapiro conjecture in real enumerative geometry
Creators: name: Eremenko, A.
name: Gabrielov, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Algebraic Geometry (math.AG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: Suppose that 2d-2 tangent lines to the rational normal curve z\mapsto (1 : z : ... : z^d) in d-dimensional complex projective space are given. It was known that the number of codimension 2 subspaces intersecting all these lines is always finite; for a generic configuration it is equal to the d^{th} Catalan number. We prove that for real tangent lines, all these codimension 2 subspaces are also real, thus confirming a special case of a general conjecture of B. and M. Shapiro. This is equivalent to the following result: If all critical points of a rational function lie on a circle in the Riemann sphere (for example on the real line), then the function maps this circle into a circle.
description: 25 pages, published version
Efficient computation of the waiting time and fidelity in quantum repeater chains
Creators: name: Brand, Sebastiaan
name: Coopmans, Tim
name: Elkouss, David
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum communication enables a host of applications that cannot be achieved by classical communication means, with provably secure communication as one of the prime examples. The distance that quantum communication schemes can cover via direct communication is fundamentally limited by losses on the communication channel. By means of quantum repeaters, the reach of these schemes can be extended and chains of quantum repeaters could in principle cover arbitrarily long distances. In this work, we provide two efficient algorithms for determining the generation time and fidelity of the first generated entangled pair between the end nodes of a quantum repeater chain. The runtime of the algorithms increases polynomially with the number of segments of the chain, which improves upon the exponential runtime of existing algorithms. Our first algorithm is probabilistic and can analyze refined versions of repeater chain protocols which include intermediate entanglement distillation. Our second algorithm computes the waiting time distribution up to a pre-specified truncation time, has faster runtime than the first one and is moreover exact up to machine precision. Using our proof-of-principle implementation, we are able to analyze repeater chains of thousands of segments for some parameter regimes. The algorithms thus serve as useful tools for the analysis of large quantum repeater chain protocols and topologies of the future quantum internet.
Engineering Si doping in anatase and rutile TiO$_2$ with oxygen vacancy for efficient optical application
Creators: name: Koley, S.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this paper, I demonstrate a density functional theory plus dynamical mean field theory study on the electronic properties of doped $TiO_2$ rutile as well as another tetragonal phase anatase with oxygen vacancy. The density of states and optical properties have been obtained from the electronic structure applying screened hybrid exchange correlation density functionals. All the single-particle excitations are treated within the dynamical mean field theory for independent quasiparticles. For optical properties, excitations are considered by solving the Bethe-Salpeter equation for Coulomb correlated electron-hole duo. On this theoretical basis, band structure and optical spectra for the two structures of $TiO_2$ are provided. Further, I compared the present results with earlier optical data of parent structure and established the increased optical efficiency in doped $TiO_2$ with oxygen vacancy in both the structure.
Tropicis flexicarinatus Scott 1926
Creators: name: Lopes-Andrade, Cristiano
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Ciidae
Tropicis
Tropicis flexicarinatus

description: Tropicis flexicarinatus Scott, 1926
 Diagnosis and comments As mentioned by Scott (1926), it differs from Tropicis sexcarinatus mainly by the sinuous elytral keels.
Specimen examined No specimen examined.
Host-fungi Unknown.
Distribution Western Indian Ocean, Seychelles (Fig. 158).
description: Published as part of Lopes-Andrade, Cristiano, 2008, An essay on the tribe Xylographellini (Coleoptera: Tenebrionoidea: Ciidae), pp. 1-110 in Zootaxa 1832 (1) on page 44, DOI: 10.11646/zootaxa.1832.1.1, http://zenodo.org/record/5126979
Materials design of Kitaev spin liquids beyond the Jackeli-Khaliullin mechanism
Creators: name: Motome, Y.
name: Sano, R.
name: Jang, S. -H.
name: Sugita, Y.
name: Kato, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The Kitaev spin liquid provides a rare example of well-established quantum spin liquids in more than one dimension. It is obtained as the exact ground state of the Kitaev spin model with bond-dependent anisotropic interactions. The peculiar interactions can be yielded by the synergy of spin-orbit coupling and electron correlations for specific electron configuration and lattice geometry, which is known as the Jackeli-Khaliullin mechanism. Based on this mechanism, there has been a fierce race for the materialization of the Kitaev spin liquid over the last decade, but the candidates have been still limited mostly to $4d$- and $5d$-electron compounds including cations with the low-spin $d^5$ electron configuration, such as Ir$^{4+}$ and Ru$^{3+}$. Here we discuss recent efforts to extend the material perspective beyond the Jackeli-Khaliullin mechanism, by carefully reexamining the two requisites, formation of the $j_{\rm eff}=1/2$ doublet and quantum interference between the exchange processes, for not only $d$- but also $f$-electron systems. We present three examples: the systems including Co$^{2+}$ and Ni$^{3+}$ with the high-spin $d^7$ electron configuration, Pr$^{4+}$ with the $f^1$-electron configuration, and polar asymmetry in the lattice structure. In particular, the latter two are intriguing since they may realize the antiferromagnetic Kitaev interactions, in contrast to the ferromagnetic ones in the existing candidates. This partial overview would stimulate further material exploration of the Kitaev spin liquids and its topological properties due to fractional excitations.
description: 24 pages, 6 figures, 4 tables, accepted for the publication in J. Phys.: Condens. Matter
Water production rates and activity of interstellar comet 2I/Borisov
Creators: name: Xing, Zexi
name: Bodewits, Dennis
name: Noonan, John
name: Bannister, Michele T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We observed the interstellar comet 2I/Borisov using the Neil Gehrels-Swift Observatory's Ultraviolet/Optical Telescope. We obtained images of the OH gas and dust surrounding the nucleus at six epochs spaced before and after perihelion (-2.56 AU to 2.54 AU). Water production rates increased steadily before perihelion from $(7.0\pm1.5)\times10^{26}$ molecules s$^{-1}$ on Nov. 1, 2019 to $(10.7\pm1.2)\times10^{26}$ molecules s$^{-1}$ on Dec. 1. This rate of increase in water production rate is quicker than that of most dynamically new comets and at the slower end of the wide range of Jupiter-family comets. After perihelion, the water production rate decreased to $(4.9\pm0.9)\times10^{26}$ molecules s$^{-1}$ on Dec. 21, which is much more rapidly than that of all previously observed comets. Our sublimation model constrains the minimum radius of the nucleus to 0.37 km, and indicates an active fraction of at least 55% of the surface. $A(0)fρ$ calculations show a variation between 57.5 and 105.6 cm with a slight trend peaking before the perihelion, lower than previous and concurrent published values. The observations confirm that 2I/Borisov is carbon-chain depleted and enriched in NH$_2$ relative to water.
description: 12 pages, 3 figures, 2 tables, submitted to ApJL
Nitrogen Enriched Quasars in the Sloan Digital Sky Survey First Data Release
Creators: name: Bentz, Misty C.
name: Hall, Patrick B.
name: Osmer, Patrick S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The quasar Q0353-383 has long been known to have extremely strong nitrogen intercombination lines at 1486 and 1750 Angstroms, implying an anomalously high nitrogen abundance of ~15 times solar. A search for similar nitrogen-rich quasars in the Sloan Digital Sky Survey First Data Release catalog has yielded 20 candidates, including four with nitrogen emission as strong or stronger than that seen in Q0353-383. Our results indicate that only about 1 in 1700 of quasars have nitrogen abundances similar to Q0353-383, while up to 1 in 130 may be in the process of extreme nitrogen enrichment.
description: Submitted to AJ - final refereed version; 18 pages, 5 figures, 3 tables
title: Data Changes Everything - An Investigation Into The Acceptance Of Learning Analytics To Support Student Success
Creators: name: Brooks, Nicola Jane
Publisher: name: The Open University
Year: 2020

description: The development and implementation of learning analytics as a mechanism to support student success has been an emerging trend within Higher Education. Previous research identifies that learning analytics is an innovative educational development but recognises that little attention has been paid to evaluating its effectiveness or pedagogic usefulness. Researchers recognise that learning analytics is a new field in need of further research to aid its credibility within the educational arena. This research study provides a better understanding of learning analytics to support student success through the examination of opportunities and challenges of learning analytics from a multi-stakeholder perspective. This study also demonstrates how learning analytics can be successfully implemented within Higher Education. Through an interpretivist paradigm, this cross-sectional research study captures the unique experiences of students, academic staff and learning analytics experts. Data collected through twelve semi-structured interviews and three student focus groups enabled the researcher to gather a broad understanding of learning analytics from those involved and provides an holistic portrayal from this cultural group. The main findings of this study suggest that learning analytics need to have a clear context and purpose within Higher Education to ensure successful development, effectiveness and pedagogic usefulness. Effective organisational change, culture, academic and student engagement, ownership and motivation are paramount. Findings also indicate disparities in the implementation of learning analytics within Higher Education, which require resolution to ensure success, and there is some discussion about how challenges can be overcome to ensure effective institutional adoption and student success.
Immunization Of Juveniles From Cybercrime Between Legal Deterrence And Technological Solution.
Creators: name: ABDELHADI, DERRAR
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 440207
subject: Cybercrime
classificationCode: 480302
subject: Comparative law

description: Electronic sexual exploitation, which is a new form of crime involving persons in general and children in particular; the digital environment has become one of the main factors for crimes against children, given its easy access and, in turn, the easy use of different technological means by the child and the lack of control in the process; it allows them to access the various sites that are victimized as a result of their emplacement and the electronic placement of children by a commercially exploited and porn. The phenomenon of cybercrime is one of the most serious crimes emerging in the child world as a result of lack of social responsibility, which calls for the urgent need to develop an integrated and comprehensive strategy based on the principle of partnership in combating cybercrime in general, and to urge that information technologies be used responsibly. الاستغلال الجنسي الالكتروني الذي يعتبر شكلا جديدا من أشكال الجرائم التي تطال الأشخاص بصفة عامة والأطفال بصفة خاصة؛ حيث أصبح المحيط الرقمي يشكل أحد أهم العوامل الرئيسية للجرائم الواقعة على الأطفال، نظرا لما يتيحه من سهولة الولوج إليه وفي المقابل سهولة استخدام مختلف الوسائل التكنولوجية من قبل الطفل وانعدام الرقابة أثناء ذلك؛ ما يسمح لهم بالوصول الى المواقع المختلفة التي يقعون ضحية لتصفحها نتيجة لاستدراجهم والإيقاع بهم إلكترونيا من قبل محرم إلكتروني يقوم باستغلالهم والمتاجرة بهم، لاسيما في المجال الإباحي. ظاهرة الإجرام الإلكتروني تعتبر من أخطر الجرائم المستجدة في عالم الطفل نتيجة الغياب المسؤولية الاجتماعية ما يستدعي الحاجة الماسة إلى إعداد إستراتيجية متكاملة وشاملة قائمة على مبدأ الشراكة في مكافحة الإجرام الإلكتروني بصفة عامة، والحث على ضرورة استخدام تكنولوجيات المعلومات بشكل مسؤول.
Renormalization of electrons in bilayer cuprate superconductors
Creators: name: Liu, Yiqun
name: Lan, Yu
name: Mou, Yingping
name: Feng, Shiping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The characteristic features of the renormalization of the electrons in the bilayer cuprate superconductors are investigated within the kinetic-energy driven superconductivity. It is shown that the quasiparticle excitation spectrum is split into its bonding and antibonding components due to the presence of the bilayer coupling, with each component that is independent. However, in the underdoped and optimally doped regimes, although the bonding and antibonding electron Fermi surface (EFS) contours deriving from the bonding and antibonding layers are truncated to form the bonding and antibonding Fermi arcs, almost all spectral weights in the bonding and antibonding Fermi arcs are reduced to the tips of the bonding and antibonding Fermi arcs, which in this case coincide with the bonding and antibonding hot spots. These hot spots connected by the scattering wave vectors ${\bf q}_{i} $ construct an octet scattering model, and then the enhancement of the quasiparticle scattering processes with the scattering wave vectors ${\bf q}_{i}$ is confirmed via the result of the autocorrelation of the ARPES spectral intensities. Moreover, the peak-dip-hump (PDH) structure developed in each component of the quasiparticle excitation spectrum along the corresponding EFS is directly related with the peak structure in the quasiparticle scattering rate except for at around the hot spots, where the PDH structure is caused mainly by the bilayer coupling. Although the kink in the quasiparticle dispersion is present all around EFS, when the momentum moves away from the node to the antinode, the kink energy smoothly decreases, while the dispersion kink becomes more pronounced, and in particular, near the cut close to the antinode, develops into a break separating of the fasting dispersing high-energy part of the quasiparticle excitation spectrum from the slower dispersing low-energy part.
description: 26 pages, 16 figures, added discussions and updated the references
X-ray emission from the old pulsar B0950+08
Creators: name: Zavlin, V. E.
name: Pavlov, G. G.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the timing and spectral analyses of theXMM-newton data on the 17-Myr-old, nearby radio pulsar B0950+08. This observation revealed pulsations of the X-ray flux of the pulsar at its radio period. The pulse shape and pulsed fraction are apparently different at lower and higher energies of the observed 0.2-10 keV energy range, which suggests that the radiation cannot be explained by a single emission mechanism. The X-ray spectrum of the pulsar can be fitted with a power-law model with a photon index about 1.75 and an (isotropic) luminosity about 9.8e29 erg/s in the 0.2-10 keV. Better fits are obtained with two-component, power-law plus thermal, models with index of 1.30 and 9.7e29 erg/s for the power-law component that presumably originates from the pulsar's magnetosphere. The thermal component, dominating at E>0.7 keV, can be interpreted as radiation from heated polar caps on the neutron star surface covered with a hydrogen atmosphere. The inferred effective temperature, radius, and bolometric luminosity of the polar caps are about 1 MK, 250 m, and 3e29 erg/s. Optical through X-ray nonthermal spectrum of the pulsar can be described as a single power-law with index 1.3-1.4 for the two-component X-ray fit. The ratio of the nonthermal X-ray (1-10 keV) luminosity to the nonthermal optical (4000-9000 Å) luminosity is within the range of 1e2-1e3 observed for younger pulsars, which suggests that the magnetospheric X-ray and optical emissions are powered by the same mechanism in all pulsars. An upper limit on the temperature of the bulk of the neutron star surface, inferred from the optical and X-ray data, is about 0.15 MK. We also analyze X-ray observations of several other old pulsars, B2224+65, J2043+2740, B0628-28, B1813-36, B1929+10, and B0823+26.
description: To be published in ApJ. Nonthermal optical and X-ray luminosities of seven radio pulsars are updated and presented in a new Table. Figure 6 showing the ratios of the luminosities vs. spin-down energy is also updated
Resolving the Nuclear Radio Emission from M32 with Very Large Array
Creators: name: Peng, Sijia
name: Li, Zhiyuan
name: Sjouwerman, Loránt O.
name: Yang, Yang
name: Xie, Fuguo
name: Yuan, Feng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Local Group dwarf elliptical galaxy M32 hosts one of the nearest and most under-luminous super-massive black holes (SMBHs) ever known, offering a rare opportunity to study the physics of accreting SMBHs at the most quiescent state. Recent Very Large Array (VLA) observations have detected a radio source at the nucleus of M32, which is suggested to be the radio counterpart of the SMBH. To further investigate the radio properties of this nuclear source, we have conducted follow-up, high-resolution VLA observations in four epochs between 2015--2017, each with dual frequencies. At 6 GHz, the nuclear source is resolved under an angular resolution of $\sim$0\farcs4, exhibiting a coreless, slightly lopsided morphology with a detectable extent of $\sim$2.5 \arcsec ($\sim$10 parsec). No significant variability can be found among the four epochs. At 15 GHz, no significant emission can be detected within the same region, pointing to a steep intrinsic radio spectrum (with a 3\,$σ$ upper limit of -1.46 for the spectral index). We discuss possible scenarios for the nature of this nuclear source and conclude that a stellar origin, in particular planetary nebulae, X-ray binaries, supernova remnants or diffuse ionized gas powered by massive stars, can be ruled out.Instead, the observed radio properties can be explained by synchrotron radiation from a hypothetical wind driven by the weakly accreting SMBH.
description: 12 peges, 3 figures, accepted for publication in ApJ. Comments welcome
title: Candidature projet Hydrosyra 2012
Creators: name: CCJ (UMR 7299)
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2019

description: Projet Hydrosyra, porté par Sophie Bouffier (Centre Camille Jullian), en 2012
MOESM1 of Microbial community dynamics and coexistence in a sulfide-driven phototrophic bloom
Creators: name: Srijak Bhatnagar
name: Cowley, Elise
name: Kopf, Sebastian
name: Sherlynette Pérez Castro
name: Kearney, Sean
name: Dawson, Scott
name: Hanselmann, Kurt
name: S. Ruff
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Molecular Biology
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1: Supplementary Materials, Methods and Results. Figure S1. Natural blooms in Trunk River. Figure S2. Color and appearance of samples from all holes, depths, and timepoints. Figure S3. Filters that were used for biomass measurements and spectral analysis. Figure S4. Total cell count of three samples (A2, A7 and K7). Figure S5. Depth profile representation of chemical data presented in Fig. 2. Figure S6. Physicochemistry. Iron, nitrate, ammonium, acetate, Ca2+, and K+ measurements. Figure S7. Individual diversity indices of all samples. Figure S8. Trajectories of community structure in hole A, E and K. Figure S9. Relative sequence abundance of the 20 most abundant clades on phylum, class, order, family and genus level, as well as the 20 most sequence abundant ASVs (amplicon sequence variants). Figure S10. Relative sequence abundance of Chlorobiales ASVs. Figure S11. Relative change of ASV abundance between surface (V1) and deeper layers (V2-4). Figure S12. Chlorobiales phylogeny. Figure S13. Circular map of metagenome-assembled genomes (MAGs). Figure S14. Chlorobiales phylogenomics. Figure S15. Protein comparison of Bin 6. Figure S16. Protein comparison of Bin 10. Figure S17. Genes involved in sulfur cycling. Figure S18. CRISPR arrays and cas genes predictions Bin 6. Figure S19. CRISPR arrays and cas genes predictions Bin 10. Figure S20. Relative sequence abundance of viral family-level clades. Table S1. Overview of sequencing output and diversity indices. Table S2. Genome statistics. Table S3. Average nucleotide identity (ANI) comparisons. Table S4. Oxidative phosphorylation and chlorophyll biosynthesis genes of Bin 6 and Bin 10. Table S5. CRISPR-Cas system information for each metagenome-assembled genome.
Aspect-ratio dependence of the spin stiffness of a two-dimensional XY model
Creators: name: Melko, R. G.
name: Sandvik, A. W.
name: Scalapino, D. J.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We calculate the superfluid stiffness of 2D lattice hard-core bosons at half-filling (equivalent to the S=1/2 XY-model) using the squared winding number quantum Monte Carlo estimator. For L_x x L_y lattices with aspect ratio L_x/L_y=R, and L_x,L_y -> infinity, we confirm the recent prediction [N. Prokof'ev and B.V. Svistunov, Phys. Rev. B 61, 11282 (1999)] that the finite-temperature stiffness parameters ρ^W_x and ρ^W_y determined from the winding number differ from each other and from the true superfluid density ρ_s. Formally, ρ^W_y -> ρ_s in the limit in which L_x -> infinity first and then L_y -> infinity. In practice we find that ρ^W_y converges exponentially to ρ_s for R>1. We also confirm that for 3D systems, ρ^W_x = ρ^W_y = ρ^W_z = ρ_s for any R. In addition, we determine the Kosterlitz-Thouless transition temperature to be T_KT/J=0.34303(8) for the 2D model.
description: 7 pages, 8 figures, 1 table. Minor changes to published version
title: Out in the cold? Outsiders and insiders in 1999: feasible and unfeasible options
Creators: name: Spaventa, Luigi
Publisher: name: PSL Quarterly Review
Year: 2013
Subjects: subject: European Monetary Union, euro, political economy
subject: D72, F55, N14

description: Article originally published in “European Monetary Union: The Problems a Transition to a Single Currency”, supplement to Banca Nazionale del Lavoro Quarterly Review, n. 196 of March 1996, pp. 137-159. As the ultimate date set for the commencement of the third stage of the European Monetary Union (EMU) and the adoption of the single currency approaches, technical, economic and political problems seem to grow in number and size. This paper focuses on one in particular: the regime governing the relationships between the single currency (or, in stage 3a, between the currencies of the Member States fulfilling the necessary conditions for the adoption of the single currency) and the currencies of the Member States with a derogation. The paper sets out the constraints under which the choice will be made and the costs and benefits of alternative solutions for the Euro-countries (the insiders) and for the less homogeneous group of outsiders. In light of this analysis, the paper sketches a possible solution which may be both institutionally feasible and economically viable. JEL Codes: D72, F55, N14
description: PSL Quarterly Review, V. 66, N. 266 (2013)
Nonlinear theory of solitary waves associated with longitudinal particle motion in lattices - Application to longitudinal grain oscillations in a dust crystal
Creators: name: Kourakis, I.
name: Shukla, P. K.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The nonlinear aspects of longitudinal motion of interacting point masses in a lattice are revisited, with emphasis on the paradigm of charged dust grains in a dusty plasma (DP) crystal. Different types of localized excitations, predicted by nonlinear wave theories, are reviewed and conditions for their occurrence (and characteristics) in DP crystals are discussed. Making use of a general formulation, allowing for an arbitrary (e.g. the Debye electrostatic or else) analytic potential form $ϕ(r)$ and arbitrarily long site-to-site range of interactions, it is shown that dust-crystals support nonlinear kink-shaped localized excitations propagating at velocities above the characteristic DP lattice sound speed $v_0$. Both compressive and rarefactive kink-type excitations are predicted, depending on the physical parameter values, which represent pulse- (shock-)like coherent structures for the dust grain relative displacement. Furthermore, the existence of breather-type localized oscillations, envelope-modulated wavepackets and shocks is established. The relation to previous results on atomic chains as well as to experimental results on strongly-coupled dust layers in gas discharge plasmas is discussed.
description: 21 pages, 12 figures, to appear in Eur. Phys. J. B
On the monodromy of moduli spaces of sheaves on K3 surfaces
Creators: name: Markman, Eyal
Publisher: name: arXiv
Year: 2003
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: Let S be a K3 surface and Aut D(S) the group of auto-equivalences of the derived category of S. We construct a natural representation of Aut D(S) on the cohomology of all moduli spaces of stable sheaves (with primitive Mukai vectors) on S. The main result of this paper is the precise relation of this action with the monodromy of the Hilbert schemes S^[n] of points on the surface. A formula is provided for the monodromy representation, in terms of the Chern character of the universal sheaf. Isometries of the second cohomology of S^[n] are lifted, via this formula, to monodromy operators of the whole cohomology ring of S^[n].
description: v3: Latex, 69 pages. A major revision. Conjecture 2.6 of the previos version is proven in Theorem 1.2 of the new version. The paper is now independent of the results of math.AG/0305043. v2: Latex, 49 pages. References [W] and [Ma4] and Corollary 7.9 added. Lemma 3.8 expanded, and minor additional changes
Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7
Creators: name: Zheludev, A.
name: Sato, T.
name: Masuda, T.
name: Uchinokura, K.
name: Shirane, G.
name: Roessli, B.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The square-lattice antiferromagnet Ba2CoGe2O7 is studied by means of neutron diffraction and inelastic scattering. This material is isostructural to the well-known Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7, but exhibits commensurate long-range Neel order at low temperatures. Measurements of the spin wave dispersion relation reveal strong in-plane anisotropy that is the likely reason for the suppression of helimagnetism.
description: 5 pages 3 figures, submitted to Phys. Rev. B
An Exploratory Study of Regulatory and Policy Frameworks Affecting Born Global Firms in Botswana and Possible Implications for Employment Creation
Creators: name: Muchazoreka Nyamugama (MBA)*
name: Prof D. Mubanga Mpundu, PhD
Publisher: name: Zenodo
Year: 2025
Subjects: Unemployment, Born Globals, Jobless Growth, Export Led growth.

description: Abstract: The study explores the role of the knowledge economy in facilitating international trade and networking. It looks at the role of law makers, business associations and lobby groups within the greater export promotion policy framework as a vital tool to drive GDP growth and reduce unemployment amid rapidly falling exports. Botswana as a country and as a market has a challenge of a relatively small population of just over 2 million and general unemployment rate of 27.5% and 47% for youths aged 18-35. This presents the country’s commercial and industrial players with a relatively small domestic market with low aggregate demand for goods and services. This in turn leads to sluggish growth in non-diamond related GDP. The country needs to diversify its economy away from diamonds and expand its export capacity and performance in world markets. The gravity of Botswana’s predicament has been amplified by the recent emergence of Laboratory grown diamonds which pose an existential threat to the mono-economy of Botswana which experienced a 44% drop in Exports for 2024. The Export Led growth strategy and Import substitution models have a significant role to play in driving both the nations diversification efforts and GDP growth agenda In particular it is a unique opportunity for Born Global Firms (BGs) to fill this gap by leveraging on technology driven internet platforms to drive the emergence of the Forth industrial revolution and accelerate international trade. The recent banning of vegetable products from South Africa in favour of Botswana products by President Masisi is a good example of a positive policy intervention in favor of import substitution. The Study explores how the political economy, policy and regulatory frameworks of the country impact on the business environment and its ability to foster export performance through the establishment of Born Global Firms in Botswana.
DeepSat V2: Feature Augmented Convolutional Neural Nets for Satellite Image Classification
Creators: name: Liu, Qun
name: Basu, Saikat
name: Ganguly, Sangram
name: Mukhopadhyay, Supratik
name: DiBiano, Robert
name: Karki, Manohar
name: Nemani, Ramakrishna
Publisher: name: arXiv
Year: 2019
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Satellite image classification is a challenging problem that lies at the crossroads of remote sensing, computer vision, and machine learning. Due to the high variability inherent in satellite data, most of the current object classification approaches are not suitable for handling satellite datasets. The progress of satellite image analytics has also been inhibited by the lack of a single labeled high-resolution dataset with multiple class labels. In a preliminary version of this work, we introduced two new high resolution satellite imagery datasets (SAT-4 and SAT-6) and proposed DeepSat framework for classification based on "handcrafted" features and a deep belief network (DBN). The present paper is an extended version, we present an end-to-end framework leveraging an improved architecture that augments a convolutional neural network (CNN) with handcrafted features (instead of using DBN-based architecture) for classification. Our framework, having access to fused spatial information obtained from handcrafted features as well as CNN feature maps, have achieved accuracies of 99.90% and 99.84% respectively, on SAT-4 and SAT-6, surpassing all the other state-of-the-art results. A statistical analysis based on Distribution Separability Criterion substantiates the robustness of our approach in learning better representations for satellite imagery.
description: This is an Accepted Manuscript of an article published by Taylor & Francis Group in Remote Sensing Letters. arXiv admin note: text overlap with arXiv:1509.03602