cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Mechanisms of Producing Primordial Black Holes By Breaking The SU(2,1)/SU(2)$\times$U(1) Symmetry
Creators: name: Stamou, Ioanna D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we present a class of potentials derived by no-scale supergravity in order to explain the production of primordial black holes (PBHs) in the Universe. By breaking the SU(2,1)/SU(2)$\times$U(1) symmetry we fix one of the two chiral fields and we derive effective scalar potentials which are capable of generating PBHs. Specifically, we modify well-known superpotentials, which reduce to Starobinsky-like effective scalar potentials. Thus, we derive scalar potentials which, on the one hand, explain the production of PBHs and, on the other hand, they conserve the transformation laws, which yield from the parametrization of the coset SU(2,1)/SU(2)$\times$U(1). Moreover, we generate PBHs by modifying the kinetic term of the Langrangian (or the Kähler potential) and we keep the superpotentials unmodified. In all cases we evaluate the fractional abundances of PBHs by comparing Press-Schechter approach and peak theory, while focusing on explaining the dark matter in the Universe. All models are in complete consistence with Planck constraints.
description: 36 pages, 12 figures
Crescita economica e riduzione dei GHGS: un problema globale
Creators: name: Perone, Gaetano
Publisher: name: Italian Review of Agricultural Economics
Year: 2019

description: The environmental sustainability is probably one of the most controversial topics of national policy agendas. The needs to combine economic growth and well-being, have forced governments to introduce tools for reducing CO2 emission and avoiding climate change. This paper aims to assess the effectiveness of these measures in the 1990-2014 period for a sample of 188 countries; and to analyze the determinants of CO2 in the 2000-2014 period for a sample of 175 countries. The results suggest that i) richest countries have a GDP elasticity of CO2 greater than that of poorest countries; and ii) GDP, energy consumption, urbanization, agricultural development, tourism and depletion of natural resources are directly correlated to CO2, while forest area, alternative energy, trade openness and FDI inflows are inversely related to CO2.
description: Italian Review of Agricultural Economics, Vol 74 No 1 (2019)
Hidden Relations of Central Charges and OPEs in Holographic CFT
Creators: name: Li, Yue-Zhou
name: Lu, H.
name: Ma, Liang
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: It is known that the $(a,c)$ central charges in four-dimensional CFTs are linear combinations of the three independent OPE coefficients of the stress-tensor three-point function. In this paper, we adopt the holographic approach using AdS gravity as an effect field theory and consider higher-order corrections up to and including the cubic Riemann tensor invariants. We derive the holographic central charges and OPE coefficients and show that they are invariant under the metric field redefinition. We further discover a hidden relation among the OPE coefficients that two of them can be expressed in terms of the third using differential operators, which are the unit radial vector and the Laplacian of a four-dimensional hyperbolic space whose radial variable is an appropriate length parameter that is invariant under the field redefinition. Furthermore, we prove that the consequential relation $c=1/3 \ell_{\rm eff}\partial a/\partial\ell_{\rm eff}$ and its higher-dimensional generalization are valid for massless AdS gravity constructed from the most general Riemann tensor invariants.
description: Latex, 1 figure, 31 pages, typos corrected, a reference added, a technique issue clarified, to appear in JHEP
The overseas Chinese areas of rural Guangdong and socialist transformation, 1949-1956
Creators: name: Peterson, Glen
Publisher: name: University of British Columbia
Year: 2010

description: This thesis examines the socialist transformation of rural China between 1949-1956 within a particular local context: that of the Overseas Chinease areas of rural Guangdong. It proceeds from a theoretical discussion of the various perspectives and works which have informed western understanding of this period in recent Chinese history, with special emphasis on the need to penetrate beyond China-wide generalizations and cultivate an informed sense of local differentiation. With a view to such, the thesis focusses upon the Overseas Chinese areas of rural Guangdong, which represent at once one of the most significant social realities of South China, as well as one of the Chinese Communist Party's most intractable historical inheritances. The social and economic legacies of mass emigration are first described, and the reader is then introduced to the Party's emerging contradictory view of the Overseas Chinese after 1949. The heart of the thesis examines the conflict and tensions of promoting socialist transformation in the Overseas Chinese areas coincident with the promulgation, beginning in 1954, of a series of privileges for domestic Overseas Chinese (returned Overseas Chinese and family dependents) aimed at attracting investment and remittances to the PRC. It is argued that socialist transformation in the Overseas Chinese areas of Guangdong was characterized by a deep-seated ideological uncertainty and confusion surrounding the proper role and status of domestic Overseas Chinese in socialist society. The "united front" aims of domestic Overseas Chinese policy clashed directly with the class-based aims and strategy of socialist transformation, producing not only ideological uncertainties, but considerable bureaucratic confusion on the ground as well. As a group, it is argued, the domestic Overseas Chinese were particularly poorly equipped and ill-disposed to participate in the newly emerging socialist rural order.
Determinants of West African international agricultural trade
Creators: name: Mancal, Ansu
name: Sant’Ana De Camargo Barros, Geraldo
Publisher: name: Italian Review of Agricultural Economics
Year: 2019

description: Agricultural production is clearly an important component of West African international trade. Purpose here is to identify determinants of West African international trade flows. For this, the expanded Structural Gravity model was used. The overall pattern of international agricultural transactions in this region is dominated by extra-regional transactions and there are differences between intra- and extra-regional determinants. In global transactions, flows are higher among the Economic Community of West African States (ECOWAS) member countries and the West African Economic and Monetary Union (WAEMU) does not significantly affect those flows. On the other hand, ECOWAS does not have significant impact on intra-regional agricultural trade and flows are greater among WAEMU member countries.
description: Italian Review of Agricultural Economics, Vol 74 No 1 (2019)
Supplement 1: from Molecular regulation of lifespan extension in fertile ant workers
Creators: name: Negroni, Matteo Antoine
name: Maide Nesibe Macit
name: Marah Stoldt
name: Feldmeyer, Barbara
name: Foitzik, Susanne
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 60408 Genomics

description: Additional methodological information, results and figures
Non-analytic behavior of 2D itinerant ferromagnets
Creators: name: Efremov, Dmitri V.
name: Betouras, Joseph J.
name: Chubukov, Andrey V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider an ordered ferromagnet in the vicinity of a T=0 transition into a paramagnet. We show that the free energy and the transverse and longitudinal static susceptibilities contain non-analyticities which destroy a continuous second-order transition. Depending on the parameters, the transition either becomes first-order, or occurs via an intermediate spiral phase.
description: 4 pages, 3 figures
Atomic Electric Dipole Moments: The Schiff Theorem and Its Corrections
Creators: name: Liu, C. -P.
name: Ramsey-Musolf, M. J.
name: Haxton, W. C.
name: Timmermans, R. G. E.
name: Dieperink, A. E. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Searches for the permanent electric dipole moments (EDMs) of diamagnetic atoms provide powerful probes of CP-violating hadronic and semileptonic interactions. The theoretical interpretation of such experiments, however, requires careful implementation of a well-known theorem by Schiff that implies a vanishing net EDM for an atom built entirely from point-like, nonrelativistic constituents that interact only electrostatically. Any experimental observation of a nonzero atomic EDM would result from corrections to the point-like, nonrelativistic, electrostatic assumption. We reformulate Schiff's theorem at the operator level and delineate the electronic and nuclear operators whose atomic matrix elements generate corrections to "Schiff screening". We obtain a form for the operator responsible for the leading correction associated with finite nuclear size -- the so-called "Schiff moment" operator -- and observe that it differs from the corresponding operator used in previous Schiff moment computations. We show that the more general Schiff moment operator reduces to the previously employed operator only under certain approximations that are not generally justified. We also identify other corrections to Schiff screening that may not be included properly in previous theoretical treatments. We discuss practical considerations for obtaining a complete computation of corrections to Schiff screening in atomic EDM calculations.
description: 31 pages, 2 figures, typeset by REVTeX
Quaternionic and Poisson-Lie structures in 3d gravity: the cosmological constant as deformation parameter
Creators: name: Meusburger, Catherine
name: Schroers, Bernd
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Each of the local isometry groups arising in 3d gravity can be viewed as the group of unit (split) quaternions over a ring which depends on the cosmological constant. In this paper we explain and prove this statement, and use it as a unifying framework for studying Poisson structures associated with the local isometry groups. We show that, in all cases except for Euclidean signature with positive cosmological constant, the local isometry groups are equipped with the Poisson-Lie structure of a classical double. We calculate the dressing action of the factor groups on each other and find, amongst others, a simple and unified description of the symplectic leaves of SU(2) and SL(2,R). We also compute the Poisson structure on the dual Poisson-Lie groups of the local isometry groups and on their Heisenberg doubles; together, they determine the Poisson structure of the phase space of 3d gravity in the so-called combinatorial description.
description: 34 pages, minor corrections, references added
Audit and Change Analysis of Spreadsheets
Creators: name: Nash, John C.
name: Smith, Neil
name: Adler, Andy
Publisher: name: arXiv
Year: 2008
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Because spreadsheets have a large and growing importance in real-world work, their contents need to be controlled and validated. Generally spreadsheets have been difficult to verify, since data and executable information are stored together. Spreadsheet applications with multiple authors are especially difficult to verify, since controls over access are difficult to enforce. Facing similar problems, traditional software engineering has developed numerous tools and methodologies to control, verify and audit large applications with multiple developers. We present some tools we have developed to enable 1) the audit of selected, filtered, or all changes in a spreadsheet, that is, when a cell was changed, its original and new contents and who made the change, and 2) control of access to the spreadsheet file(s) so that auditing is trustworthy. Our tools apply to OpenOffice.org calc spreadsheets, which can generally be exchanged with Microsoft Excel.
description: 10 pages, 3 figures
Shear stresses of colloidal dispersions at the glass transition in equilibrium and in flow
Creators: name: Crassous, J. J.
name: Siebenbürger, M.
name: Ballauff, M.
name: Drechsler, M.
name: Hajnal, D.
name: Henrich, O.
name: Fuchs, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider a model dense colloidal dispersion at the glass transition, and investigate the connection between equilibrium stress fluctuations, seen in linear shear moduli, and the shear stresses under strong flow conditions far from equilibrium, viz. flow curves for finite shear rates. To this purpose thermosensitive core-shell particles consisting of a polystyrene core and a crosslinked poly(N-isopropylacrylamide)(PNIPAM) shell were synthesized. Data over an extended range in shear rates and frequencies are compared to theoretical results from integrations through transients and mode coupling approaches. The connection between non-linear rheology and glass transition is clarified. While the theoretical models semi-quantitatively fit the data taken in fluid states and the predominant elastic response of glass, a yet unaccounted dissipative mechanism is identified in glassy states.
description: 17 pages, 11 figures; J. Chem. Phys. in print (2008)
ผลกระทบเชิงเศรษฐศาสตร์สิ่งแวดล้อมในการกำหนดนโยบายระบบขนส่งสาธารณะภายในสถาบันการศึกษาและชุมชนเพื่อเข้าสู่การเป็นมหาวิทยาลัยสีเขียว กรณีศึกษา มหาวิทยาลัยราชภัฏชัยภูมิ
Creators: name: สุรวุฒิ สุดหา
Publisher: name: Program in Political Science, Faculty of Humanities and Social Sciences, Surindra Rajabhat University
Year: 2023
Subjects: ก๊าซเรือนกระจก
คาร์บอนฟุตพริ้นท์
พลังงานสะอาด
ภาวะโลกร้อน
รถยนต์พลังงานไฟฟ้า

description: วารสารการบริหารการปกครองและนวัตกรรมท้องถิ่น, 7, 3, 171-190
Special agricultural safeguards in the meat market and their impact on Brazilian economy
Creators: name: Cabral Da Costa, Cinthia
name: Lee Burnquist, Heloisa
name: Guilhoto, Joaquim José Martins
Publisher: name: Italian Review of Agricultural Economics
Year: 2019

description: This study identifies the impact of special agricultural safeguards (SSG) for the global meat market and for the Brazilian economy. The tariff lines subject to SSG were selected and the period of analysis was from 1995 to 2015. The value of additional tariff was calculated for each of the most important tariff lines, as well as, their impact on imports and Brazilian exports. The most important markets that applied SSGs were the U.S. for beef and European Union for poultry. For the additional tariffs that were estimated, the results indicated that the impact of the value of the meat not exported by Brazil to EU and the U.S. due to SSG tariff was equivalent to the loss of BRL 3.7 billion of the economy’s production value and almost BRL 2 billion of the Brazilian Gross Domestic Product.
description: Italian Review of Agricultural Economics, Vol 74 No 1 (2019)
Capacity of Underspread Noncoherent WSSUS Fading Channels under Peak Signal Constraints
Creators: name: Durisi, Giuseppe
name: Bölcskei, Helmut
name: Shamai, Shlomo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We characterize the capacity of the general class of noncoherent underspread wide-sense stationary uncorrelated scattering (WSSUS) time-frequency-selective Rayleigh fading channels, under peak constraints in time and frequency and in time only. Capacity upper and lower bounds are found which are explicit in the channel's scattering function and allow to identify the capacity-maximizing bandwidth for a given scattering function and a given peak-to-average power ratio.
description: To be presented at IEEE Int. Symp. Inf. Theory 2007, Nice, France
Elementary teachers, art education, and arts networking : a comparative study
Creators: name: Whelan, Leslie Michael
Publisher: name: University of British Columbia
Year: 2010

description: Art education is part of the curriculum of elementary schools in Queensland, Vancouver, and Seattle and teachers in all three systems have problems, priorities and emphases within their art education programs. Arts networking as a means of mutual aid and assistance has been tried in two of the systems and this study attempts to ascertain whether, in the perception of the teachers involved, it is a viable method of dissemination of ideas and solutions to problems. Information on the problems, priorities, and emphases of the teachers in the three systems was sought through a questionnaire and principals were interviewed for perceptions on arts networking. This comparative study shows that elementary teachers in the three systems share many problems, have slightly differing emphases and priorities and those involved perceive networking to be a viable means of art education support provided continued funding and administrative encouragement are available.
Analysis of critical parameters for nonrelativistic models in symmetric nuclear matter
Creators: name: Dutra, Mariana
name: Lourenço, Odilon
name: Viñas, Xavier
name: Mondal, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this work we have analyzed several features of symmetric nuclear matter (SNM) at finite temperature described by different zero- and finite-range nonrelativistic families of models, namely, Skyrme, Gogny, Momentum-dependent interaction (MDI), Michigan three-range Yukawa (M3Y) and Simple Effective Interaction (SEI). We have calculated the critical parameters (CP) associated to the liquid-gas phase coexistence for nuclear matter from these parametrizations and show that they are in agreement with their experimental and theoretical values obtained in the literature. Our study also points out to a strong evidence of universality presented by the hadronic models, namely, model independence in the gaseous phase and distinguishability among different interactions in the liquid phase. We have performed a correlation study among different CP and SNM properties. Such studies involving different finite range interactions are scarce in literature. The analyzed models show an overall increasing trend of the critical temperature as a function of critical pressure.
description: 11 pages, 6 figure. Accepted for publication in PRC
The role of the CAP in fostering the diffusion of institutional hybrid arrangements: three case studies from Italy
Creators: name: Ciliberti, Stefano
name: Chiodini, Gabriele
name: Frascarelli, Angelo
Publisher: name: Italian Review of Agricultural Economics
Year: 2019

description: The last reforms of the CAP have promoted the diffusion of new regulatory tools to improve the coordination of decisions along the agri-food supply chain. Interbranch organizations, protection consortia, the regulation of the supply for PDO products and the extension of rules represent solutions aimed at fostering the diffusion of institutionalized collective arrangements in the presence of an increasing uncertainty surrounding transactions. In light of New Institutional Economics, this paper describes and evaluates some interesting case studies that refer to some strategic sectors for the primary sectors in Italy: wine, tobacco and cheese. The results highlight that CAP can play a central role in depicting a regulatory framework that provides room for meso-institutions to foster the diffusion of hybrid forms of collective arrangements, especially in sectors that are highly regulated or subsidized.
description: Italian Review of Agricultural Economics, Vol 73 No 3 (2018)
Elliptic Flow arising from Ridges due to Semi-hard Scattering
Creators: name: Hwa, Rudolph C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Azimuthal anisotropy in heavy-ion collisions is studied by taking into account the ridges generated by semi-hard scattering of intermediate-momentum partons, which can be sensitive to the initial spatial configuration of the medium in non-central collisions. In a simple treatment of the problem where the recombination of only thermal partons is considered, analytical formulas can be derived that yield results in accord with the data on v_2 for p_T <1-2 GeV/c. Centrality dependence is described by a geometrical factor. Ridge phenomenology is used to determine the initial slopes of v_2 at low p_T for both pion and proton. For higher p_T, shower partons from high-p_T jets must be included, but they are not considered here.
description: revised version with new title and expanded discussion, to be published in Phys. Lett. B
La convenienza economica alla coltivazione di OGM in Italia: un’analisi sul campione della rete italiana di contabilità agricola (RICA)
Creators: name: Monda, Mafalda
name: Tantari, Antonella
Publisher: name: Italian Review of Agricultural Economics
Year: 2019

description: The present paper examines the economic convenience of the cultivation of GMOs in Italy. In particular, a simulation was conducted on the effects of the adoption of GM corn for specialized Italian farms, through the comparison of the gross margin of GM and conventional maize. Results obtained on the sample of farms belonging to the Italian farm accountancy data network (FADN), in the 2013-2015 period, show that the gross margin obtainable with the use of GM corn is, on average, higher than that obtained with the use of the conventional one. Results obtained on the sample grouped according to the utilized agricultural area, show that bigger farms could benefit more from the cultivation of GM corn. Moreover, specialized farms located in traditional areas show the highest advantage from the cultivation of GM corn.
description: Italian Review of Agricultural Economics, Vol 74 No 1 (2019)
The DAMA/LIBRA apparatus
Creators: name: Bernabei, R.
name: Belli, P.
name: Bussolotti, A.
name: Cappella, F.
name: Cerulli, R.
name: Dai, C. J.
name: d'Angelo, A.
name: He, H. L.
name: Incicchitti, A.
name: Kuang, H. H.
name: Ma, J. M.
name: Mattei, A.
name: Montecchia, F.
name: Nozzoli, F.
name: Prosperi, D.
name: Sheng, X. D.
name: Ye, Z. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The $\simeq$ 250 kg highly radiopure NaI(Tl) DAMA/LIBRA apparatus, running at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N., is described.
description: 37 pages, 27 figures
Quantum mechanics on space with SU(2) fuzziness
Creators: name: Fatollahi, Amir H.
name: Shariati, Ahmad
name: Khorrami, Mohammad
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Quantum mechanics of models is considered which are constructed in spaces with Lie algebra type commutation relations between spatial coordinates. The case is specialized to that of the group SU(2), for which the formulation of the problem via the Euler parameterization is also presented. SU(2)-invariant systems are discussed, and the corresponding eigenvalue problem for the Hamiltonian is reduced to an ordinary differential equation, as it is the case with such models on commutative spaces.
description: 12 pages, no figs, LaTeX
Corruption Scandals In Women's Path to Executive Power
Creators: name: Mitra, Sutapa
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2021
Subjects: Women executives
Women head of government
Corruption scandal
Women’s path to national leadership

description: This paper explores the relationship between corruption scandals and women’s path to executive power using the following research question: How do corruption scandals impact women’s path to executive power? This examination contributes to the literature on women executives, corruption and gender. I will trace women’s path to executive power and the impact of corruption scandal at different stages of their rise to national office using three case studies: Angela Merkel, Michelle Bachelet, and Ellen Johnson-Sirleaf. I will explore the impact of corruption scandals on their respective paths to national executive power using Beckwith’s removal and deferral framework. The findings showcase that corruption scandals can be beneficial to women’s rise to executive power in party leadership contests in parliamentary systems, and during national elections if corruption is a salient electoral topic and cultural gendered beliefs frame women candidates as less corrupt. For Merkel, corruption scandal was significant in accessing party leadership. For Johnson-Sirleaf, corruption scandal was significant during national elections. For Bachelet, corruption scandal had an ambiguous effect. Nevertheless, Bachelet’s case informs a theoretical contribution by demonstrating that deferral can occur without removal and still facilitate senior women’s path to power under Beckwith’s framework.
q-Deformed Superalgebras
Creators: name: Schmidt, Alexander
name: Wachter, Hartmut
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The article deals with q-analogs of the three- and four-dimensional Euclidean superalgebra and the Poincare superalgebra.
description: 38 pages, LateX, no figures, corrected typos
X-ray flares, plateaus, and chromatic breaks of GRB afterglows from up-scattered forward-shock emission
Creators: name: Panaitescu, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Scattering of the forward-shock synchrotron emission by a relativistic outflow located behind the leading blast-wave may produce an X-ray emission brighter than that coming directly from the forward-shock and may explain four features displayed by Swift X-ray afterglows: flares, plateaus (slow decays), chromatic light-curve breaks, and fast post-plateau decays. For a cold scattering outflow, the reflected flux overshines the primary one if the scattering outflow is nearly baryon-free and highly relativistic. These two requirements can be relaxed if the scattering outflow is energized by weak internal shocks, so that the incident forward-shock photons are also inverse-Compton scattered, in addition to bulk-scattering. Sweeping-up of the photons left behind by the forward shock naturally yields short X-ray flares. Owing to the boost in photon energy produced by bulk-scattering scattering, the reflected emission is more likely to overshine that coming directly from the forward shock at higher photon energies, yielding light-curve plateaus and breaks that appear only in the X-ray. The brightness, shape, and decay of the X-ray light-curve plateau depend on the radial distribution of the scatterer's Lorentz factor and mass-flux. Chromatic X-ray light-curve breaks and sharp post-plateau decays cannot be accommodated by the direct forward-shock emission and argue in favour of the scattering-outflow model proposed here. On the other hand, the X-ray afterglows without plateaus, those with achromatic breaks, and those with very long-lived power-law decays are more naturally accommodated by the standard forward-shock model. Thus the diversity of X-ray light-curves arises from the interplay of the scattered and direct forward-shock emissions.
description: to appear in MNRAS, 12 pages, 7 figures
Strongly coupled phonon fluid and Goldstone modes in an anharmonic quantum solid: transport and chaos
Creators: name: Tulipman, Evyatar
name: Berg, Erez
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study properties of thermal transport and quantum many-body chaos in a lattice model with $N\to\infty$ oscillators per site, coupled by strong anharmonic terms. We first consider a model with only optical phonons. We find that the thermal diffusivity $D_{\rm th}$ and chaos diffusivity $D_L$ (defined as $D_L = v_B^2/ λ_L$, where $v_B$ and $λ_L$ are the butterfly velocity and the scrambling rate, respectively) satisfy $D_{\rm th} \approx γD_L$ with $γ\gtrsim 1$. At intermediate temperatures, the model exhibits a "quantum phonon fluid" regime, where both diffusivities satisfy $D^{-1} \propto T$, and the thermal relaxation time and inverse scrambling rate are of the order the of Planckian timescale $\hbar/k_B T$. We then introduce acoustic phonons to the model and study their effect on transport and chaos. The long-wavelength acoustic modes remain long-lived even when the system is strongly coupled, due to Goldstone's theorem. As a result, for $d=1,2$, we find that $D_{\rm th}/D_L\to \infty$, while for $d=3$, $D_{\rm th}$ and $D_{L}$ remain comparable.
description: 16 + 9 pages, 8 + 1 figures, updated version to match published version
Projective modules over noncommutative tori are multi-window Gabor frames for modulation spaces
Creators: name: Luef, Franz
Publisher: name: arXiv
Year: 2008
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 42C15, 46L08 (Primary), 43A20, 46L89 (Secondary)

description: In the present investigation we are linking noncommutative geometry over noncommutative tori with Gabor analysis, where the first has its roots in operator algebras and the second in time-frequency analysis. Therefore we are in the position to invoke modern methods of operator algebras, e.g. topological stable rank of Banach algebras, to exploit the deeper properties of Gabor frames. Furthermore we are able to extend results due to Connes and Rieffel on projective modules over noncommutative tori to Banach algebras, which arise in a natural manner in Gabor analysis. The main goal of this investigation is twofold: (i) an interpretation of projective modules over noncommutative tori in terms of Gabor analysis and (ii) that the Morita-Rieffel equivalence between noncommutative tori is the natural framework for the duality theory of Gabor frames. More concretely, we interpret generators of projective modules over noncommutative tori as the Gabor atoms of multi-window Gabor frames for modulation spaces. Moreover, we show that this implies the {\it existence} of good multi-window Gabor frames for modulation spaces with Gabor atoms in Feichtinger's algebra and in Schwartz space.
description: Many minor changes in the presentation and several typos fixed, Theorem 2.5 and Theorem 4.2. are extended to the higher-dimensional case
title: A NOVEL COMPONENT BASED FRAMEWORK FOR COVERT DATA LEAKAGE DETECTION
Creators: name: Nafea, H
Publisher: name: Liverpool John Moores University
Year: 2022

description: Cyber-attacks are causing billions of dollars of losses every year and data breaches are one of the major causes of these losses. The problem of data breach/leakage is attributed as a serious threat to organisations where any incident can inflict cost that is not only limited to monetary value but also can cause damage to organization goodwill, branding and reputation. Steganography is the practice of writing hidden messages via a medium in such a way that only the sender and the intended recipient know about the hidden message. Steganography is categorised into different forms including text, image, audio, video and network/protocol steganography. Network steganography is increasingly being used by malwares to facilitate the data leakage. This study focuses on aspects of network steganography at different levels of network packets. The existing tools for data leakage prevention and detection are often bypassed by the use of sophisticated techniques such as network steganography for stealing the data. This is due to several weaknesses of the existing detection systems. First, these techniques have high time and memory training complexities as well as large training data sets. These are challenging issues as the amount of data generated every second becomes very large in many realms. Secondly, the number of their false positives is high, making them inaccurate. Finally, there is a lack of a framework catering for needs such as raising alerts as well as data monitoring and updating/adapting of a threshold value used for checking packets for covert data. To overcome these weaknesses, this study proposes a novel framework that includes elements such as continuous data monitoring, threshold maintenance and alert notification. The study also proposes a model based on statistical measures to detect covert data leakages especially with regard to non-linear chaotic data. The main advantage of the proposed framework is its capability of providing more efficient results with tolerance/threshold values. Experiment outcomes indicate that the proposed framework performs better in comparison with state-of-the-art techniques in terms of accuracy and efficiency. Additionally, the proposed ii mathematical model can also be used for on-the-fly detection of covert data as opposed to offline processing methods.
Demonstration of Shor's quantum factoring algorithm using photonic qubits
Creators: name: Lu, Chao-Yang
name: Browne, Daniel E.
name: Yang, Tao
name: Pan, Jian-Wei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report an experimental demonstration of a complied version of Shor's algorithm using four photonic qubits. We choose the simplest instance of this algorithm, that is, factorization of N=15 in the case that the period $r=2$ and exploit a simplified linear optical network to coherently implement the quantum circuits of the modular exponential execution and semi-classical quantum Fourier transformation. During this computation, genuine multiparticle entanglement is observed which well supports its quantum nature. This experiment represents a step toward full realization of Shor's algorithm and scalable linear optics quantum computation.
description: small changes over v2; to appear in PRL
Physical Properties of Young Stellar Populations in 24 Starburst Galaxies Observed with FUSE
Creators: name: Pellerin, Anne
name: Robert, Carmelle
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We presents the main physical properties of very young stellar populations seen with FUSE in 24 individual starbursts. These characteristics have been obtained using the evolutionary spectral synthesis technique in the far-ultraviolet range with the LavalSB code. For each starburst, quantitative values for age, metallicity, initial mass function slope, stellar mass, and internal extinction have been obtained and discussed in details. Limits of the code have been tested. One main conclusion is that most starbursts (and probably all of them) cannot be represented by any continuous star formation burst in the far-ultraviolet. Also, quantitative values of various optical diagnostics related to these stellar populations have been predicted. Underlying stellar populations, dominated by B-type stars, have been detected in NGC 1140, NGC 4449, and possibly NGC 3991. We characterized the young stellar populations of less than 5 Myr in Seyfert 2 nuclei.
description: 24 pages including figures. Accepted for publication in MNRAS
A study of the relationship between water hardness and heart disease mortality in British Columbia
Creators: name: Wiens, Michele
Publisher: name: University of British Columbia
Year: 2010

description: Several studies have indicated an inverse relationship between the hardness of community water supplies and deaths due to heart disease. In this thesis, studies of water hardness and heart disease are briefly reviewed; the role of water hardness in heart disease mortality is assessed; and, the hypothesis that soft water contributes to heart disease mortality is tested using data for 103 cities in British Columbia. The correlations of water hardness, waterborne calcium, and waterborne magnesium with sex-specific age-standardized heart disease mortality rates were not statistically-significant nor does the geographical pattern suggest any obvious relationship. The effects of water hardness on human heart-related mortality are difficult to separate from the effects of smoking, high-cholesterol diets, and other heart disease risk factors at the level of ecological correlation.
Hayabusa2 Extended Mission: New Voyage to Rendezvous with a Small Asteroid Rotating with a Short Period
Creators: name: Hirabayashi, M.
name: Mimasu, Y.
name: Sakatani, N.
name: Watanabe, S.
name: Tsuda, Y.
name: Saiki, T.
name: Kikuchi, S.
name: Kouyama, T.
name: Yoshikawa, M.
name: Tanaka, S.
name: Nakazawa, S.
name: Takei, Y.
name: Terui, F.
name: Takeuchi, H.
name: Fujii, A.
name: Iwata, T.
name: Tsumura, K.
name: Matsuura, S.
name: Shimaki, Y.
name: Urakawa, S.
name: Ishibashi, Y.
name: Hasegawa, S.
name: Ishiguro, M.
name: Kuroda, D.
name: Okumura, S.
name: Sugita, S.
name: Okada, T.
name: Kameda, S.
name: Kamata, S.
name: Higuchi, A.
name: Senshu, H.
name: Noda, H.
name: Matsumoto, K.
name: Suetsugu, R.
name: Hirai, T.
name: Kitazato, K.
name: Farnocchia, D.
name: Naidu, S. P.
name: Tholen, D. J.
name: Hergenrother, C. W.
name: Whiteley, R. J.
name: Moskovitz, N. A.
name: Abell, P. A.
name: group, the Hayabusa2 extended mission study
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Hayabusa2 is the Japanese Asteroid Return Mission and targeted the carbonaceous asteroid Ryugu, conducted by the Japan Aerospace Exploration Agency (JAXA). The goal of this mission was to conduct proximity operations including remote sensing observations, material sampling, and a Small Carry-On Impact experiment, as well as sample analyses. As of September 2020, the spacecraft is on the way back to Earth with samples from Ryugu with no critical issues after the successful departure in November 2019. Here, we propose an extended mission in which the spacecraft will rendezvous with a small asteroid with ~30 m - ~40 m in diameter that is rotating at a spin period of ~10 min after an additional ~10-year cruise phase. We introduce that two scenarios are suitable for the extended mission. In the first scenario, the spacecraft will perform swing-by maneuvers at Venus once and Earth twice to arrive at asteroid 2001 AV43. In the second scenario, it will perform swing-by maneuvers at Earth twice to reach asteroid 1998 KY26. In both scenarios, the mission will continue until the early 2030s. JAXA recently released the decision that the spacecraft will rendezvous with 1998 KY26. This paper focuses on our scientific assessments of the two scenarios but leaves the decision process to go to 1998 KY26 for future reports. Rendezvous operations will be planned to detail the physical properties and surrounding environments of the target, one of the smallest elements of small planetary bodies. By achieving the planned operations, the mission will provide critical hints on the violent histories of collisions and accumulations of small bodies in the solar system. Furthermore, the established scientific knowledge and techniques will advance key technologies for planetary defense.
description: 51 pages, 9 figures, and 10 tables. The article is in press in Advances in Space Research
$N$-spike string in $AdS_3 \times S^1$ with mixed flux
Creators: name: Nayak, Rashmi R.
name: Pandit, Priyadarshini
name: Panigrahi, Kamal L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Sigma model in $AdS_3\times S^3$ background supported by both NS-NS and R-R fluxes is one of the most distinguished integrable models. We study a class of classical string solutions for $N$-spike strings moving in $AdS_3 \times S^1$ with angular momentum $J$ in $S^1 \subset S^5$ in the presence of mixed flux. We observe that the addition of angular momentum $J$ or winding number $m$ results in the spikes getting rounded off and not end in cusp. The presence of flux shows no alteration to the rounding-off nature of the spikes. We also consider the large $N$-limit of $N$-spike string in $AdS_3 \times S^1$ in the presence of flux and show that the so-called Energy-Spin dispersion relation is analogous to the solution we get for the periodic-spike in $AdS_3-pp-$wave $\times S^1$ background with flux.
description: 31 pages, 1 figure. Minor changes, to be published in JHEP
Bulges of disk galaxies at intermediate redshifts. I. Samples with and without bulges in the Groth Strip Survey
Creators: name: Dominguez-Palmero, L.
name: Balcells, M.
name: Erwin, P.
name: Prieto, M.
name: Cristobal-Hornillos, D.
name: Eliche-Moral, M. C.
name: Guzman, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We aim to define a sample of intermediate-z disk galaxies harbouring central bulges, and a complementary sample of disk galaxies without measurable bulges. We intend to provide colour profiles for both samples, as well as measurements of nuclear, disk, and global colours, which may be used to constrain the relative ages of bulges and disks. We select a diameter-limited sample of galaxies in images from the HST/WFPC2 Groth Strip survey, which is divided into two subsamples of higher and lower inclination to assess the role of dust in the measures quantities. Mergers are visually identified and excluded. We take special care to control the pollution by ellipticals. The bulge sample is defined with a criterion based on nuclear surface brightness excess over the inward extrapolation of the exponential law fitted to the outer regions of the galaxies. We extract colour profiles on the semi-minor axis least affected by dust in the disk, and measure nuclear colours at 0.85 kpc from the centre over those profiles. Disk colours are measured on major axis profiles; global colours are obtained from 2.6"-diameter apertures. We obtain a parent sample containing 248 galaxies with known redshifts, spectroscopic or photometric, spanning 0.1 < z < 1.2. The bulge subsample comprises 54 galaxies (21.8% of the total), while the subsample with no measureable bulges is 55.2% of the total (137 galaxies). The remainder (23%) is composed of mergers. We list nuclear, disk, and global colours (observed and restframe) and magnitudes (apparent and absolute), as well as galaxy colour gradients for the samples with and without bulges. We also provide images, colour maps, plots of spectral energy distributions, major-axis surface brightness profiles, and minor-axis colour profiles for both samples.
description: 38 pages, 10 figures, appendix A (6 tables), appendix B (54 pstamps), appendix C (7 figures). Accepted for publication in A&A
Observations of AR Sco with $Chandra$ and $AstroSat$ Soft X-ray Telescope
Creators: name: Singh, K. P.
name: Girish, V.
name: Tiwari, J.
name: Barrett, P. E.
name: Buckley, D. A. H.
name: Potter, S. B.
name: Schlegel, E.
name: Rana, V.
name: Stewart, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present our $AstroSat$ soft X-ray observations of a compact binary system, AR Sco, and analysis of its X-ray observations with $Chandra$ that were taken only about a week before the $AstroSat$ observations. An analysis of the soft X-ray ($0.3-2.0$ keV) data limits the modulation of the spin, orbital, or beat periods to less than 0.03 counts s$^{-1}$ or $
description: 9 pages, 8 figures, to be published in the Journal of Astrophysics and Astronomy
INFLUENZA DELLA FORMAZIONE E DELL’ESPERIENZA CLINICA SULLA SCELTA ESTRATTIVA IN ORTODONZIA
Creators: name: Rapuano, Alessia
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2008

description: Scopo della tesi è stato valutare gli effetti dell’apprendimento e dell’esperienza clinica, sulla scelta terapeutica di una malocclusione. Allo studio hanno preso parte 44 esaminatori, divisi in 5 gruppi secondo il grado formazione in ortodonzia: 10 studenti iscritti all’ultimo anno del Corso di Laurea in Odontoiatria e Protesi Dentaria dell’Università degli Studi di Napoli “Federico II”; 10 specializzandi iscritti alla Scuola di Specializzazione in Ortognatodonzia dell’Università degli Studi di Napoli “Federico II”; 10 ortodontisti che hanno conseguito la specializzazione da meno di 10 anni; 10 ortodontisti che hanno conseguito la specializzazione da oltre 10 anni; 4 ortodontisti, che hanno conseguito la Specializzazione da oltre 15 anni e  che  hanno conseguito l’European bord of orthodontics (EBO). Il campione esaminato è rappresentato da 26 pazienti del Dipartimento di Ortodonzia della Clinica Odontoiatrica dell’Università degli Studi di Napoli “Federico II”. I pazienti sono stati valutati dai 4 specialisti certificati EBO. Sono stati successivamente selezionati 15 pazienti in cui i 4 specialisti EBO sono stati maggiormente concordi ( ≥ 80%) sulla scelta terapeutica. Le decisione terapeutiche relative ai 15 pazienti selezionati hanno rappresentato il gold standard necessario per valutare la concordanza inter-esaminatore degli altri 4 gruppi. Gli esaminatori, sono stati invitati ad analizzare indipendentemente per ogni singolo paziente tutti i records clinico-diagnostici e a formulare un piano di trattamento indicante nello specifico la propria scelta in merito alla necessità di estrarre o meno. In caso di scelta estrattiva è stato chiesto di specificare quale dente estrarre. Dai dati raccolti in questo studio è emerso che la decisione estrattiva viene eseguita in circa il 50% dei casi. I premolari sono i denti più estratti. La frequenza estrattiva non è influenzata dal grado di formazione. La concordanza inter-esaminatore nella scelta estrattiva è influenzata dal grado di formazione: risulta essere insufficiente tra gli studenti del corso di laurea in odontoiatria e protesi dentaria e scarsa tra gli specializzandi e gli specialisti in ortodonzia.
Coordination Office for WCRP Regional Activities
Creators: name: Balino, Beatriz
Publisher: name: Zenodo
Year: 2019
Subjects: World Climate Research Programme, climate information for regions, regional climate activities

description: The Coordination Office for WCRP regional activities is a new initiative of the World Climate Research Programme which has 3 goals: (i)  stimulate cross-regional collaborations  among WCRP activities, (ii) facilitate capacity development by organizing training events and workshops in the regions, and (iii) assist in the development of climate information for regions for climate services and policy makers