cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The quantum canonical ensemble in phase space
Creators: name: de Almeida, Alfredo M. Ozorio
name: Ingold, Gert-Ludwig
name: Brodier, Olivier
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The density operator for a quantum system in thermal equilibrium with its environment depends on Planck's constant, as well as the temperature. At high temperatures, the Weyl representation, that is, the thermal Wigner function, becomes indistinguishable from the corresponding classical distribution in phase space, whereas the low temperature limit singles out the quantum ground state of the system's Hamiltonian. In all regimes, thermal averages of arbitrary observables are evaluated by integrals, as if the thermal Wigner function were a classical distribution. The extension of the semiclassical approximation for quantum propagators to an imaginary thermal time, bridges the complex intervening region between the high and the low temperature limit. This leads to a simple quantum correction to the classical high temperature regime, irrespective of whether the motion is regular or chaotic. A variant of the full semiclassical approximation with a real thermal time, though in a doubled phase space, avoids any search for particular trajectories in the evaluation of thermal averages. The double Hamiltonian substitutes the stable minimum of the original system's Hamiltonian by a saddle, which eliminates local periodic orbits from the stationary phase evaluation of the integrals for the partition function and thermal averages.
description: 24 pages, 2 figures
Behavior of the topological susceptibility at finite T and $μ$ and signs of restoration of chiral symmetries
Creators: name: Ruivo, M. C.
name: Costa, Pedro
name: de Sousa, C. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the possible restoration of chiral and axial symmetries across the phase transition at finite temperature and chemical potential, by analyzing the behavior of several physics quantities, such as the quark condensates and the topological susceptibility, the respective derivatives in order to chemical potential, and the masses of meson chiral partners. We discuss whether only chiral symmetry or both chiral and axial symmetries are restored and what is the role of the strange quark. The results are compared with recent lattice results.
description: Talk given at the IVth International Conference on Quarks and Nuclear Physics (QNP06), Madrid, 5-10 June 2006
Global spectral energy distribution of the Crab Nebula in the prospect of the Planck satellite polarisation calibration
Creators: name: Macias-Perez, Juan Francisco
name: Mayet, F.
name: Aumont, J.
name: Desert, F. X.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Whithin the framework of the Planck satellite polarisation calibration, we present a study of the Crab Nebula spectral energy distribution (SED) over more than 6 decades in frequency ranging from 1 to $\rm 10^6 GHz$. The Planck satellite mission observes the sky from 30 to 857 GHz and therefore we focus on the millimetre region. We use radio and submillimetre data from the WMAP satellite between 23 and 94 GHz (from 13 to 3.18 mm) and from the Archeops balloon experiment between 143 (2.1 mm) and 545 GHz (0.55 mm), and a compendium of other Crab Nebula observations. The Crab SED is compared to models including three main components : synchrotron which is responsible for the emission at low and at high frequencies, dust which explains the excess of flux observed by the IRAS satellite and an extra component on the millimetre regime. From this analysis we conclude that the unpolarised emission of the Crab Nebula at microwave and millimetre wavelengths is the same synchrotron emission that the one observed in the radio domain. Therefore, we expect the millimetre emission of the Crab nebula to be polarised with the same degree of polarisation and orientation than the radio emission. We set upper limits on the possible errors induced by any millimetre extra component on the reconstruction of the degree and angle of polarisation at the percent level as a maximum. This result strongly supports the choice by the Planck collaboration of the Crab nebula emission for performing polarisation cross-checks in the range 30 (299 mm) to 353 GHz (0.849 mm).
Letter from J.E. [John Edgar] McAllister to Jim [James] Goldie, March 1, 1932
Creators: name: McAllister, John Edgar
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to Jim [James] Goldie from J.E. [John Edgar] McAllister, dated March 1, 1932, regarding the Auditor's and issues with taxes.
The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space
Creators: name: Walter, Fabian
name: Carilli, Chris
name: Neeleman, Marcel
name: Decarli, Roberto
name: Popping, Gergo
name: Somerville, Rachel S.
name: Aravena, Manuel
name: Bertoldi, Frank
name: Boogaard, Leindert
name: Cox, Pierre
name: da Cunha, Elisabete
name: Magnelli, Benjamin
name: Obreschkow, Danail
name: Riechers, Dominik
name: Rix, Hans-Walter
name: Smail, Ian
name: Weiss, Axel
name: Assef, Roberto J.
name: Bauer, Franz
name: Bouwens, Rychard
name: Contini, Thierry
name: Cortes, Paulo C.
name: Daddi, Emanuele
name: Diaz-Santo, Tanio
name: Gonzalez-Lopez, Jorge
name: Hennawi, Joseph
name: Hodge, Jacqueline A.
name: Ivison, Rob
name: Oesch, Pascal
name: Sargent, Mark
name: van der Werf, Paul
name: Wagg, Jeff
name: Yung, L. Y. Aaron
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We combine the recent determination of the evolution of the cosmic density of molecular gas (H_2) using deep, volumetric surveys, with previous estimates of the cosmic density of stellar mass, star formation rate and atomic gas (HI), to constrain the evolution of baryons associated with galaxies averaged over cosmic time and space. The cosmic HI and H_2 densities are roughly equal at z~1.5. The H_2 density then decreases by a factor 6^{+3}_{-2} to today's value, whereas the HI density stays approximately constant. The stellar mass density is increasing continuously with time and surpasses that of the total gas density (HI and H_2) at redshift z~1.5. The growth in stellar mass cannot be accounted for by the decrease in cosmic H_2 density, necessitating significant accretion of additional gas onto galaxies. With the new H_2 constraints, we postulate and put observational constraints on a two step gas accretion process: (i) a net infall of ionized gas from the intergalactic/circumgalactic medium to refuel the extended HI reservoirs, and (ii) a net inflow of HI and subsequent conversion to H_2 in the galaxy centers. Both the infall and inflow rate densities have decreased by almost an order of magnitude since z~2. Assuming that the current trends continue, the cosmic molecular gas density will further decrease by about a factor of two over the next 5 Gyr, the stellar mass will increase by approximately 10%, and cosmic star formation activity will decline steadily toward zero, as the gas infall and accretion shut down.
description: Accepted for publication in The Astrophysical Journal
Status of a point-like neutron generator development
Creators: name: Golubev, S. V.
name: Skalyga, V. A.
name: Izotov, I. V.
name: Razin, S. V.
name: Shaposhnikov, R. A.
name: Vybin, S. S.
name: Bokhanov, A. F.
name: Kazakov, M. Yu.
name: Shlepnev, S. P.
name: Burdonov, K. F.
name: Soloviev, A. A.
name: Starodubtsev, M. V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In this paper we report on a high current density ion beam profile diagnostics with a slit-based system as a reliable method, capable of high thermal load applications. The task arose in frames of a point-like neutron source development for neutron radiography. In previous research, it was suggested to construct such a system as a D-D neutron generator based on the high current gasdynamic ion source, which utilises the plasma of electron cyclotron resonance discharge sustained by powerful millimeter wave gyrotron radiation. This device is able to produce focused D+ beams with a characteristic diameter of 1 mm, total current above 100 mA, and current density at a level of several A/cm^2. Study of such intense beams profile to obtain the best focusing efficiency and minimize neutron producing area appeared to be a challenging task. The paper also demonstrates the possibility of fast neutron imaging with a point-like powerful neutron generator (neutron yield on the level of 10^10 1/s).
description: 11 pages, 7 figures, submitted to JINST
Scrutinizing new physics of $B_d\to ϕ(η^{(')},π, ω)$ decay modes
Creators: name: Mohapatra, Manas K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We inspect the exclusive hadronic decay modes $ B_d\to ϕ(η^{(')}, π, ω)$, induced by quark level transition as $b\to d$ $(ΔS=0)$, in vector like down quark model. As these decay modes insist highly suppressed followed by the predicted branching fraction $\mathcal{O}(10^{-9})$ which reflects to scrutinize physics beyond the standard model. We constrain the new parameter space inferred from experimental limits on leptonic $B_d\to \ell \ell(\ell=e, μ, τ)$ and nonleptonic decay modes $B_d \to η' π^0$ and $B_u\to ρ^- η'$. We then check the new physics contributions can have significant impact on the prominent observable so called branching ratio of $B_d\to ϕ(η^{(')},π, ω)$ processes.
description: 25 pages, 5 figures
All the supersymmetric solutions of N=1,d=5 ungauged supergravity
Creators: name: Bellorin, J.
name: Meessen, P.
name: Ortin, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We classify the supersymmetric solutions of ungauged N=1 d=5 SUGRA coupled to vector multiplets and hypermultiplets. All the solutions can be seen as deformations of solutions with frozen hyperscalars. We show explicitly how the 5-dimensional Reissner-Nordstrom black hole is deformed when hyperscalars are living on SO(4,1)/SO(4) are turned on, reducing its supersymmetry from 1/2 to 1/8. We also describe in the timelike and null cases the solutions that have one extra isometry and can be reduced to N=2,d=4 solutions. Our formulae allows the uplifting of certain N=2,d=4 black holes to N=1,d=5 black holes on KK monopoles or to pp-waves propagating along black strings.
description: Some typos fixed and some paragraphs improved. 44 pages, Latex 2e file, no figures. Version to be published in JHEP
Bounds on length scales of classical spacetime foam models
Creators: name: Bernadotte, S.
name: Klinkhamer, F. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Simple models of a classical spacetime foam are considered, which consist of identical static defects embedded in Minkowski spacetime. Plane-wave solutions of the vacuum Maxwell equations with appropriate boundary conditions at the defect surfaces are obtained in the long-wavelength limit. The corresponding dispersion relations ω^2=ω^2(\vec{k}) are calculated, in particular, the coefficients of the quadratic and quartic terms in \vec{k}. Astronomical observations of gamma-ray bursts and ultra-high-energy cosmic rays then place bounds on the coefficients of the dispersion relations and, thereby, on particular combinations of the fundamental length scales of the static spacetime-foam models considered. Spacetime foam models with a single length scale are excluded, even models with a length scale close to the Planck length (as long as a classical spacetime remains relevant).
description: 22 pages with revtex4, v5: published version
Διαχρονική εξέλιξη της θνησιμότητας από γυναικολογικούς καρκίνους στην Ελλάδα
Creators: name: Παυλίδου, Ευαγγελία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Θνησιμότητα
Καρκίνος μαστού
Καρκίνος τραχήλου μήτρας
Καρκίνος μήτρας
Καρκίνος ωοθηκών
Πληθυσμιακή μελέτη
Mortality
Breast cancer
Cervical cancer
Uterus cancer
Ovarian cancer
Population based study

description: Αντικείμενο μελέτης αποτελεί η θνησιμότητα από κακοήθη νεοπλάσματα τουμαστού στις γυναίκες, κακοήθη νεοπλάσματα του τραχήλου της μήτρας, κακοήθηνεοπλάσματα της μήτρας και άλλα μη καθοριζόμενα, καθώς και κακοήθηνεοπλάσματα των ωοθηκών και εξαρτημάτων της μήτρας. Μετά την επεξεργασία τωνδεδομένων από τα αρχεία της ΕΣΥΕ, υπολογίστηκε ο ειδικός συντελεστήςθνησιμότητας για κάθε έναν τύπο καρκίνου, για καθεμία από τις επιμέρους ηλικιακές ομάδες του γυναικείου πληθυσμού (0-24,25-34,35-44,45-54,55-64,65-74,75 ετών και άνω), τόσο για το σύνολο της χώρας όσο και για καθεμία από τις 13 περιφέρειες της Ελλάδος χωριστά, κατά την περίοδο 1980-2005. Στα νεοπλάσματα του μαστού παρατηρείται πτωτική τάση για τις γυναίκες κάτω των 65 ετών και αυξητική τάση για τις γυναίκες μεγαλύτερης ηλικίας. Δεν ανιχνεύονται ιδιαίτερες αλλαγές στη εξέλιξη της θνησιμότητας για τον καρκίνο του τραχήλου, με εξαίρεση ίσως την ηλικιακή ομάδα των 55-64 ετών, που εμφανίζει ελαφρά πτωτική τάση, τόσο σε επίπεδο χώρας όσο και σε επίπεδο περιφερειών. Για τα νεοπλάσματα της μήτρας πτωτική τάση παρατηρείται στις γυναίκες 35-74 ετών, ενώ στον καρκίνο των ωοθηκών σταθερά ανοδική είναι η πορεία εξέλιξης της θνησιμότητας στις ηλικίες άνω των 65 ετών, με διπλασιασμό και πενταπλασιασμό του συντελεστή αντίστοιχα στην ομάδα των 65-74 ετών και στην ομάδα των 75 ετών και άνω, από το 1980-2005.
description: The aim of the study is to estimate the mortality rate of the breast cancer inwomen, the cervical cancer, the uterus cancer and the ovarian cancer. After theelaboration of the data from the archives of ESYE (National Statistical Office of Greece), the specific mortality rate of every cancer, in every one of the following age groups of the female population (0-24,25-34,35-44,45-54,55-64,65-74,over 75 years old), for the whole of Greece as well as for every region separately, for every year during the period 1980-2005, was estimated. In breast cancer there was a declining trend for women under 65 years old and an upward trend for those of an older age. There were no particular changes in the evolution of the mortality of the cervical cancer, with the exception of the age group 55-64, which showed a slightly declining trend in Greece as a whole but in the different regions as well. For the uterus cancer a declining trend was observed in women 35-74 years old, while in the ovarian cancer a steadily rising evolutionary route in the age groups over 65, with a double level of themortality rate in the 65-74 group and a five times higher level in the over 75 group, was found, in 2005 in comparison with 1980.
Modified SO(3) Lattice Gauge Theory at non zero T with Parallel Tempering: Monopole and Vortex Condensation
Creators: name: Burgio, G.
name: Fuhrmann, M.
name: Kerler, W.
name: Muller-Preussker, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The deconfinement transition is studied close to the continuum limit of SO(3) lattice gauge theory. High barriers for tunnelling among different twist sectors causing loss of ergodicity for local update algorithms are circumvented by means of parallel tempering. We compute monopole and center vortex free energies both within the confining phase and through the deconfinement transition. We discuss in detail the general problem of defining order parameters for adjoint actions.
description: 14 pages, 11 figures, 6 tables. Uses revtex. Figure, tables and comments added. To appear on Phys. Rev. D
Oxygen vacancies nucleate charged domain walls in ferroelectrics
Creators: name: Petralanda, Urko
name: Kruse, Mads
name: Simons, Hugh
name: Olsen, Thomas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the influence of oxygen vacancies on the formation of charged 180$^\circ$ domain walls in ferroelectric BaTiO$_3$ using first principles calculations. We show that it is favorable for vacancies to assemble in crystallographic planes, and that such clustering is accompanied by the formation of a charged domain wall. The domain wall has negative bound charge, which compensates the nominal positive charge of the vacancies and leads to a vanishing density of free charge at the wall. This is in contrast to the positively charged domain walls, which are nearly completely compensated by free charge from the bulk. The results thus explain the experimentally observed difference in electronic conductivity of the two types of domain walls, as well as the generic prevalence of charged domain walls in ferroelectrics. Moreover, the explicit demonstration of vacancy driven domain wall formation implies that specific charged domain wall configurations may be realized by bottom-up design for use in domain wall based information processing.
description: 10 pages, 7 figures
Representation of the penalty term of dynamic concave utilities
Creators: name: Delbaen, Freddy
name: Peng, Shige
name: Gianin, Emanuela Rosazza
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Risk Management (q-fin.RM)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: 60G40; 60G46

description: In this paper we will provide a representation of the penalty term of general dynamic concave utilities (hence of dynamic convex risk measures) by applying the theory of g-expectations.
description: An updated version is published in Finance & Stochastics. The final publication is available at http://www.springerlink.com
Το ζήτημα της αναλογικής εφαρμογής των διατάξεων της εμπορικής αντιπροσωπείας στη διανομή και το franchising
Creators: name: Κελεσίδου, Ευγνωσία Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Διανομή
Δικαιόχρηση
Αποζημίωση
Πελατεία
Καταγγελία
Αντιπρόσωπος
Franchising
Distribution
Agency

description: Η σύμβαση εμπορικής αντιπροσωπείας ρυθμίζεται από το π.δ. 219/1991 που εκδόδηκε σε συμμόρφωση με την οδηγία 86/653/ΕΟΚ. Τα άρθρα 8 και 9 του πδ. ορίζουν τα σχετικά με την καταγγελία και την αποζημίωση πελατίας. Τα άρθρα αυτά εφαρμόζονται από τα ελληνικά δικαστήρια αναλογικά και στην σύμβαση διανομής, η οποία δε ρυθμίζεται νομοθετικά στο ελληνικό δίκαιο. Με την αναλογική εφαρμογή συμφωνεί και η θεωρία. Αντίθετα, τα ελληνικά δικαστήρια δεν κάνουν δεκτή την αναλογική εφαρμογή στις συμβάσεις Franchising αν και η θεωρία τάσσεται υπέρ της αναλογίας.
description: Commercial agency contracts are regulated by presidential decree 219/1991 following EC Directive 86/653 Articles 8 and 9 of the presidential decree which prescribe the terms and conditions for renunciation and clientele compensetion are also applied by greek courts by analogy in the case of distribution contracts wich remain unregulated under greek law. This application by analogy is also welcomed by doctrine. Nevertheless, greek courts have not accepted application by analogi in the case of franchising contracts, though doctrine has been in support as well.
Transcription of a story about Verdena's grandmother and Pedro Freddy
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Newbold, Lindsey
name: Rice, Keren
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-091010-06: Transcription of a story about Verdena's grandmother working as a cook and Pedro Freddy getting shot (file VP-300810-02), from the beginning of the story to 3:04.
High-temperature Bose-Einstein condensation of polaritons: realization under the intracavity laser pumping of matter condition
Creators: name: Averchenko, V. A.
name: Alodjants, A. P.
name: Arakelian, S. M.
name: Bagayev, S. N.
name: Vinogradov, E. A.
name: Egorov, V. S.
name: Stolyarov, A. I.
name: Chekhonin, I. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A quantum model of Bose-Einstein condensation based on processes involving polaritons excited in an intracavity absorbing cell with resonance atoms, which is manifested in the spectral characteristics of the system, is considered. It is shown that the spectral 'condensation' appears which is directly related to the degeneracy of a weakly interacting gas of polaritons resulting in quasi-condensation at room temperature. The possibility of obtaining polariton condensation as a new phase state by using the confinement of polaritons in an atomic optical harmonic trap is discussed.
description: 9 pages, PDF only
Non-global logarithms in hadron collisions at $N_c=3$
Creators: name: Hatta, Yoshitaka
name: Ueda, Takahiro
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the rapidity gap survival probability associated with the Higgs decay and Higgs plus dijet production in proton-proton collisions by resumming the leading non-global logarithms without any approximation to the number of colors. For dijet production, depending on partonic subprocesses, the probability involves various `color multipoles', i.e., the product of 4 ($qq\to qq$) or 6 ($qg\to qg$) or 8 ($gg\to gg$) Wilson lines. We calculate all these multipoles for a fixed dijet configuration and discuss the factorization of higher multipoles into lower multipoles as well as the validity of the large-$N_c$ approximation.
description: 15 pages, 8 figures, 9 ancillary text files for numerical results included; v2: references added
Fractional-Order Single State Reset Element
Creators: name: Karbasizadeh, Nima
name: Saikumar, Niranjan
name: HosseinNia, S. Hassan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper proposes a fractional-order reset element whose architecture allows for the suppression of nonlinear effects for a range of frequencies. Suppressing the nonlinear effects of a reset element for the desired frequency range while maintaining it for the rest is beneficial, especially when it is used in the framework of a "Constant in gain, Lead in phase" (CgLp) filter. CgLp is a newly introduced nonlinear filter, bound to circumvent the well-known linear control limitation -- the waterbed effect. The ideal behaviour of such a filter in the frequency domain is unity gain while providing a phase lead for a broad range of frequencies. However, CgLp's ideal behaviour is based on the describing function, which is a first-order approximation that neglects the effects of the higher-order harmonics in the output of the filter. Although CgLp is fundamentally a nonlinear filter, its nonlinearity is not required for all frequencies. Thus, it is shown in this paper that using the proposed reset element architecture, CgLp gets closer to its ideal behaviour for a range of frequencies, and its performance will be improved accordingly.
Hiding a drift
Creators: name: Rásonyi, Miklós
name: Schachermayer, Walter
name: Warnung, Richard
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H05, 60G44 (Primary), 60G05, 60H10 (Secondary)

description: In this article we consider a Brownian motion with drift of the form \[dS_t=μ_t dt+dB_t\qquadfor t\ge0,\] with a specific nontrivial $(μ_t)_{t\geq0}$, predictable with respect to $\mathbb{F}^B$, the natural filtration of the Brownian motion $B=(B_t)_{t\ge0}$. We construct a process $H=(H_t)_{t\ge0}$, also predictable with respect to $\mathbb{F}^B$, such that $((H\cdot S)_t)_{t\ge 0}$ is a Brownian motion in its own filtration. Furthermore, for any $δ>0$, we refine this construction such that the drift $(μ_t)_{t\ge0}$ only takes values in $]μ-δ,μ+δ[$, for fixed $μ>0$.
description: Published in at http://dx.doi.org/10.1214/09-AOP469 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Modeling cardiac muscle fibers in ventricular and atrial electrophysiology simulations
Creators: name: Piersanti, Roberto
name: Africa, Pasquale C.
name: Fedele, Marco
name: Vergara, Christian
name: Dedè, Luca
name: Corno, Antonio F.
name: Quarteroni, Alfio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Since myocardial fibers drive the electric signal propagation throughout the myocardium, accurately modeling their arrangement is essential for simulating heart electrophysiology (EP). Rule-Based-Methods (RBMs) represent a commonly used strategy to include cardiac fibers in computational models. A particular class of such methods is known as Laplace-Dirichlet-Rule-Based-Methods (LDRBMs) since they rely on the solution of Laplace problems. In this work we provide a unified framework, based on LDRBMs, for generating full heart muscle fibers. First, we review existing ventricular LDRBMs providing a communal mathematical description and introducing also some modeling improvements with respect to the existing literature. We then carry out a systematic comparison of LDRBMs based on meaningful biomarkers produced by numerical EP simulations. Next we propose, for the first time, a LDRBM to be used for generating atrial fibers. The new method, tested both on idealized and realistic atrial models, can be applied to any arbitrary geometries. Finally, we present numerical results obtained in a realistic whole heart where fibers are included for all the four chambers using the discussed LDRBMs.
RESENHA  CARLINO, Paula. Textos en contexto: leer y escribir en la universidad. Edição digital. Buenos Aires, Argentina: Asociación Internacional de Lectura, 2021. 114p.
Creators: name: de Melo Cordeiro Eulálio, Marcela
Publisher: name: Zenodo
Year: 2024

description: Nessa perspectiva, ao compreender que ensinar a escrita na universidade significa, também, ensinar a aprender conteúdos disciplinares, Paula Carlino, doutora em Psicologia pela Universidade Autônoma de Madri e pesquisadora do Conselho Nacional de Investigação Científica e Técnica – Conicet, organizou o livro, em língua espanhola, com 114 páginas, intitulado Textos en Contextos: leer y escribir en la universidad. Essa obra teve sua primeira edição impressa e publicada em outubro de 2004, enquanto que sua edição digital, objeto desta resenha, foi publicada em 2021 pela Asociación Internacional de Lectura, na Argentina. A necessidade de uma versão digital da obra se explica pela relevância de suas discussões, ao passo que a distância temporal entre as publicações atenua, apesar de passados dezessete anos, a necessária ampliação dessas reflexões.
Solute-point defect interactions, coupled diffusion, and radiation induced segregation in fcc nickel
Creators: name: Toijer, E.
name: Messina, L.
name: Domain, C.
name: Vidal, J.
name: Becquart, C. S.
name: Olsson, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Radiation-induced segregation (RIS) of solutes in materials exposed to irradiation is a well-known problem. It affects the life-time of nuclear reactor core components by favouring radiation-induced degradation phenomena such as hardening and embrittlement. In this work, RIS tendencies in face-centered cubic (fcc) Ni-X (X = Cr, Fe, Ti, Mn, Si, P) dilute binary alloys are examined. The goal is to investigate the driving forces and kinetic mechanisms behind the experimentally observed segregation. By means of ab initio calculations, point-defect stabilities and interactions with solutes are determined, together with migration energies and attempt frequencies. Transport and diffusion coefficients are then calculated in a mean-field framework, to get a full picture of solute-defect kinetic coupling in the alloys. Results show that all solutes considered, with the exception of Cr, prefer vacancy-mediated over interstitial-mediated diffusion during both thermal and radiation-induced migration. Cr, on the other hand, preferentially migrates in a mixed-dumbbell configuration. P and Si are here shown to be enriched, and Fe and Mn to be depleted at sinks during irradiation of the material. Ti and Cr, on the other hand, display a crossover between enrichment at lower temperatures, and depletion in the higher temperature range. Results in this work are compared with previous studies in body-centered cubic (bcc) Fe, and discussed in the context of RIS in austenitic alloys.
Narration of "Pingu Helps to Deliver the Mail"
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Rice, Keren
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-091010-05: Narration of an animated video "Pingu Helps to Deliver the Mail" (episode 2 of Pingu, a television series created by Otmar Gutmann). This recording was previously deposited with the Endangered Language Archive (ELAR) with identifier "0186-20140318 - Pingu helps deliver mail," part of the collection "Expanding the Documentation and Description of Hupa (Athabaskan)" (collection ID hupa-campbell-0186).
Einstein-Yang-Mills solutions in higher dimensional de Sitter spacetime
Creators: name: Brihaye, Yves
name: Radu, Eugen
name: Tchrakian, D. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider particle-like and black holes solutions of the Einstein-Yang-Mills system with positive cosmological constant in d>4 spacetime dimensions. These configurations are spherically symmetric and present a cosmological horizon for a finite value of the radial coordinate, approaching asymptotically the de Sitter background. In the usual Yang--Mills case we find that the mass of these solutions, evaluated outside the cosmological horizon at future/past infinity generically diverges for d>4. Solutions with finite mass are found by adding to the action higher order gauge field terms belonging to the Yang--Mills hierarchy. A discussion of the main properties of these solutions and their differences from those to the usual Yang-Mills model, both in four and higher dimensions is presented.
description: 17 pages, 8 figures
Speculative Container Scheduling for Deep Learning Applications in a Kubernetes Cluster
Creators: name: Mao, Ying
name: Fu, Yuqi
name: Zheng, Wenjia
name: Cheng, Long
name: Liu, Qingzhi
name: Tao, Dingwen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: In the past decade, we have witnessed a dramatically increasing volume of data collected from varied sources. The explosion of data has transformed the world as more information is available for collection and analysis than ever before. To maximize the utilization, various machine and deep learning models have been developed, e.g. CNN [1] and RNN [2], to study data and extract valuable information from different perspectives. While data-driven applications improve countless products, training models for hyperparameter tuning is still a time-consuming and resource-intensive process. Cloud computing provides infrastructure support for the training of deep learning applications. The cloud service providers, such as Amazon Web Services [3], create an isolated virtual environment (virtual machines and containers) for clients, who share physical resources, e.g., CPU and memory. On the cloud, resource management schemes are implemented to enable better sharing among users and boost the system-wide performance. However, general scheduling approaches, such as spread priority and balanced resource schedulers, do not work well with deep learning workloads. In this project, we propose SpeCon, a novel container scheduler that is optimized for shortlived deep learning applications. Based on virtualized containers, such as Kubernetes [4] and Docker [5], SpeCon analyzes the common characteristics of training processes. We design a suite of algorithms to monitor the progress of the training and speculatively migrate the slow-growing models to release resources for fast-growing ones. Specifically, the extensive experiments demonstrate that SpeCon improves the completion time of an individual job by up to 41.5%, 14.8% system-wide and 24.7% in terms of makespan.
description: Under Review
Η ευθύνη για νομικά ελαττώματα. Σύγκριση με την ευθύνη για πραγματικά ελαττώματα. Είναι de lege ferenda δικαιολογημένη η ενοποίηση της νομοθετικής ρύθμισης των δύο ευθυνών
Creators: name: Κυρούδη, Ιωάννα Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Ενοχικό Δίκαιο
Ειδικό ενοχικό δίκαιο
Πώληση
Νομικά ελαττώματα
Πραγματικά ελαττώματα
Σύμβαση της Βιέννης για τις διεθνείς πωλήσεις κινητών
Contract law
Breach of contract
Remedies
Sale of goods
Right of a third party
Faulty goods

description: Αντικείμενο της παρούσας εργασίας αποτελεί ένας κύκλος ζητημάτων που δημιουργούνται από την ανώμαλη εξέλιξη της σύμβασης πώλησης. Προσεγγίζεται η έννοια του νομικού ελαττώματος και συγκρίνεται με αυτή του πραγματικού ελαττώματος και της συμβατικής παράβασης. Ερευνάται η ευθύνη του πωλητή, όταν το πωληθέν πράγμα βαρύνεται με νομικά ελαττώματα, οι διαφορές της ευθύνης αυτής από την ευθύνη του, όταν το πράγμα έχει πραγματικά ελαττώματα (ή λείπει από αυτό μία συνομολογημένη ιδιότητα) και η σχέση των δύο ειδών ευθύνης. Ταυτόχρονα, εξετάζονται τα ανωτέρω υπό το πρίσμα της συγκριτικής συνεκτίμησης της Σύμβασης της Βιέννης για τις διεθνείς πωλήσεις κινητών και του νέου γερμανικού ενοχικού δικαίου.
description: This paper focuses on certain issues concerning the breach of sale of goods. The saled goods, that are not free from rights of a third party, are defined and compared to faulty goods and breach of contract. In addition, the seller's liability, when the goods are not free from rights of a third party, the dissimilarities of the above liability to the liability due to faulty goods and the interrelation of the two divisions of liability are examined. At the conclusion of this paper, the above issues are examined under the light of the United Nation Convention on Contracts for the International Sale of Goods (CISG) and the new german contract law.
The U.S. Enterprise for the Americas Initiative: Support for Western Hemisphere Economic and Trade Reform
Creators: name: Forsythe, Kenneth
name: Neff, Liana
name: Forsythe, Kenneth
name: Neff, Liana
Publisher: name: Unknown
Year: 1993
Subjects: International Development
International Relations/Trade

description: Western Hemisphere countries are seeking trade liberalization that may eventually lead to a hemispheric free trade zone. The Enterprise for the Americas Initiative (EAI) is a U.S. program supporting economic and trade reform underway in Latin America and the Caribbean. The initiative s objectives are to promote liberalized trade, reduce official debt, and increase foreign investment in the Latin American and Caribbean countries. These countries have renewed regional agreements and have taken new steps toward stabilizing their domestic economies. No longer following protectionist import-substitution policies, regional and subregional groups of countries are promoting unilateral reductions in trade barriers and greater international interaction by their members.
Towards connectedness and trust : nurses’ enactment of their moral agency within an organizational context
Creators: name: Rodney, Patricia Anne
Publisher: name: University of British Columbia
Year: 2009

description: This study generates an understanding of how nurses enact their moral agency within the culture of the organizational context in which they practice. Using a feminist ethnographic design, the investigator undertook approximately 180 hours of fieldwork on an acute medical unit in a community hospital, and approximately 38 hours of fieldwork on a second acute medical unit in a tertiary hospital. The investigator worked closely with six staff nurses during this time, and included formal research interviews with these six nurses to supplement her observations. She also included observation of and research interviews with five clinicians/nurse managers from the hospitals, and, in order to further extend her analysis, research interviews with three home care nurses from different communities. It was found that nurses enact their moral agency in a relational matrix with other members of the health care team, and that this matrix is strengthened by authentic presence and trust between all professionals/providers and patients and their families. The context of nurses' work was portrayed as fraught with everyday ethical problems that generated significant moral ambiguity and moral distress for nurses. There were significant personal costs associated with nurses' work, including fatigue, guilt, and personal risk. Moreover, the culture of the organizational context for nursing practice and patient care was portrayed as problematic. The communication between professionals/providers and patients and their families was fragmented, as was the communication between departments and agencies. Finally, a number of dominant sociopolitical ideologies seemed to be embedded in the organizational culture, including the disvaluing of nurses' work, the disvaluing of acute medicine as a nursing practice context, and the disvaluing of those in need—particularly elderly patients and patients with substance use problems. The investigator concludes by calling for more feminist ethnographic work so that the influence of problematic organizational cultures on the ethics of professional practice can be further addressed. She claims that trust should be fostered in health care teams by making the various members more authentically accessible to each other. Finally, she notes that the ethical mandate of professionals must encompass a broader notion of societal good if the dominant sociopolitical ideologies are to be challenged.
Investment vs. reward in a competitive knapsack problem
Creators: name: Neumann, Oren
name: Gros, Claudius
Publisher: name: arXiv
Year: 2021
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Natural selection drives species to develop brains, with sizes that increase with the complexity of the tasks to be tackled. Our goal is to investigate the balance between the metabolic costs of larger brains compared to the advantage they provide in solving general and combinatorial problems. Defining advantage as the performance relative to competitors, a two-player game based on the knapsack problem is used. Within this framework, two opponents compete over shared resources, with the goal of collecting more resources than the opponent. Neural nets of varying sizes are trained using a variant of the AlphaGo Zero algorithm. A surprisingly simple relation, $N_A/(N_A+N_B)$, is found for the relative win rate of a net with $N_A$ neurons against one with $N_B$. Success increases linearly with investments in additional resources when the networks sizes are very different, i.e. when $N_A \ll N_B$, with returns diminishing when both networks become comparable in size.
A compact pulsar wind nebula model of the gamma-ray loud binary LS I +61 303
Creators: name: Zdziarski, A. A.
name: Neronov, A.
name: Chernyakova, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study a model of of LS I +61 303 in which its radio to TeV emission is due to interaction of a relativistic wind from a young pulsar with the wind from its companion Be star. We assume the fast polar wind is clumpy, which is typical for radiatively-driven winds. The clumpiness cause the two winds to mix. The relativistic electrons from the pulsar wind are retained in the moving clumps by inhomogeneities of the magnetic field, which explains the X-ray variability observed on time scales much shorter than the orbital period. We calculate detailed inhomogeneous spectral models reproducing the average broad-band spectrum from radio to TeVs. Given the uncertainties the form of the distribution of relativistic electrons, the X-ray spectrum could be dominated by either Compton or synchrotron emission. The recent Fermi observations constrain the high-energy cut-off in the electron distribution to be at the Lorentz factor of 2 10^4 or 10^8 in the former and latter model, respectively. We provide formulae comparing the losses of the relativistic electrons due to Compton, synchrotron and Coulomb processes vs. the distance from the Be star. We calculate the optical depth of the wind to free-free absorption, showing that it will suppress most of the radio emission within the orbit. We point out the importance of Compton and Coulomb heating of the stellar wind within and around the gamma-ray emitting region. Then, we find the most likely mechanism explaining the orbital modulation at TeV energies is anisotropy of emission.
description: MNRAS, in press
A C^1 -Generic dichotomy for diffeomorphisms
Creators: name: Bonatti, C.
name: Diaz, L. J.
name: Pujals, E. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We show that, for every compact n-dimensional manifold, n\geq 1, there is a residual subset of Diff^1(M) of diffeomorphisms for which the homoclinic class of any periodic saddle of f verifies one of the following two possibilities: Either it is contained in the closure of an infinite set of sinks or sources (Newhouse phenomenon), or it presents some weak form of hyperbolicity called dominated splitting (this is a generalization of a bidimensional result of Mane [Ma3}). In particular, we show that any C^1 -robustly transitive diffeomorphism admits a dominated splitting.
description: 64 pages, published version
O'ZBEKISTONDA EKOTURIZMNING ATROF-MUHITGA TA'SIRI
Creators: name: Maxamadaliyeva Diyora
Publisher: name: Zenodo
Year: 2025

description: Annotatsiya: Maqolada O‘zbekistonda ekoturizmning atrof-muhitga ta’siri tahlil qilinadi. Ekoturizm tabiiy resurslarni muhofaza qilish va mahalliy iqtisodiyotni rivojlantirishga xizmat qilsa-da, chiqindilar ko‘payishi, resurslardan ortiqcha foydalanish va ekotizimlarning buzilishi kabi muammolarni ham keltirib chiqarishi mumkin. Tadqiqotda ekoturizmning ijobiy va salbiy jihatlari, ekologik muvozanatni saqlash bo‘yicha amalga oshirilayotgan chora-tadbirlar hamda barqaror rivojlanish yo‘nalishlari yoritiladi.
Bounds on the Spectral Sparsification of Symmetric and Off-Diagonal Nonnegative Real Matrices
Creators: name: Mercado, Sergio
name: Villagra, Marcos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Discrete Mathematics (cs.DM)
subject: Spectral Theory (math.SP)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 05C50, 68R01, 15B57, 15A42

description: We say that a square real matrix $M$ is \emph{off-diagonal nonnegative} if and only if all entries outside its diagonal are nonnegative real numbers. In this note we show that for any off-diagonal nonnegative symmetric matrix $M$, there exists a nonnegative symmetric matrix $\widehat{M}$ which is sparse and close in spectrum to $M$.
description: 9 pages
Comparing scattering rates from Boltzmann and dynamical mean-field theory
Creators: name: Wais, M.
name: Kaufmann, J.
name: Battiato, M.
name: Held, K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We compute scattering rates for electrons in the two-dimensional Hubbard model for a one-orbital metal and a two-orbital band insulator by means of the Boltzmann scattering equation (BSE) and dynamical mean-field theory (DMFT). As an intermediate method between both, we also consider the BSE without momentum conservation. In the weak interaction regime and for the band insulator, the last two agree to very good accuracy. The BSE with momentum conservation, on the other hand, shows slightly larger scattering rates, and a momentum differentiation of these on the Fermi surface. For the Mott insulator at strong interaction, the DMFT electron scattering rates are much larger and defy a BSE description. Noteworthy, the scattering rates for the band insulator are exceedingly small because -- in contrast to the Mott insulator -- there is virtually no impact ionization.
description: 15 pages, 12 figures
Νέα πρωτόκολλα πρόσβασης στα μέσα για τοπικά δίκτυα εκπομπής
Creators: name: Τσαλουχίδης, Ανανίας Γεώργιος
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Τοπικά δίκτυα εκπομπής
Πρωτόκολλο πρόσβασης στο μέσο
Πρωτόκολλο ομαδοποίησης
Δυναμική κατανομή του μέσου
Προφιλ δικτυακής κίνησης
Ποιότητα δικτυακών υπηρεσιών
Local broadcast networks
Medium access protocol
Clustering protocol
Dynamic bandwidth allocation
Network traffic profile
Quality of network services

description: Με την παρούσα εργασία θα προσπαθήσουμε να επεκτείνουμε τη χρήση των μηχανισμών ομαδοποίησης οντοτήτων στην ανάπτυξη νέων πρωτοκόλλων για τοπικά δίκτυα εκπομπής. Το γεγονός ότι οι μηχανισμοί ομαδοποίησης μας επιτρέπουν να ομαδοποιούμε αποτελεσματικά οντότητες με παρόμοια χαρακτηριστικά – συμπεριφορά θα αποτελέσει το κλειδί στην ανάπτυξη ενός νέου πρωτοκόλλου το οποίο θα δίνει τη δυνατότητα στους σταθμούς ενός δικτύου να αξιοποιούν το κοινό μέσο μετάδοσης και το διαθέσιμο εύρος ζώνης ανάλογα με τα χαρακτηριστικά των ομάδων στις οποίες εντάσσονται.Το νέο πρωτόκολλο που θα παρουσιαστεί είναι ένα χωρίς συγκρούσεις πρωτόκολλο επιπέδου MAC το οποίο έχει τη δυνατότητα να κατανέμει το διαθέσιμο εύρος ζώνης του μέσου πρόσβασης στους σταθμούς ενός δικτύου ανάλογα με τις ανάγκες τους. Επίσης, το πρωτόκολλο έχει την ικανότητα να αντιλαμβάνεται τις ανάγκες των σταθμών του δικτύου ώστε η κατανομή του κοινού μέσου μετάδοσης μεταξύ των σταθμών να γίνεται με το βέλτιστο τρόπο.Ο διαχωρισμός των σταθμών του δικτύου σε ομάδες είναι απαραίτητος καθώς το πρωτόκολλο μετά την εφαρμογή του clustering αλγορίθμου έχοντας σαφή εικόνα των αναγκών της κάθε ομάδας σταθμών αποδίδει στην κάθε ομάδα εύρος ζώνης ικανό να ικανοποιήσει με το βέλτιστο τρόπο την ανάγκη της ομάδας – cluster σε throughput προκειμένου οι ουρές των σταθμών που ανήκουν σε αυτή να αδειάζουν με όσο το δυνατό μικρότερη καθυστέρηση.
description: In this paper clustering algorithms are applied in order to create a Clustering Based Dynamic Bondwidth allocation Protocol (C-DyBa). Clustering algorithms are used to classify network hosts according to their network traffic profile. After classification (clustering) the protocol achieves to allocate the shared medium access to network hosts in order to serve their needs reducing the average packet delay and thus retaining the QoS of the network. C-DYBA is a collisionless MAC protocol.