cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Spitzer/IRAC Survey of the Orion Molecular Clouds
Creators: name: Megeath, S. T.
name: Flaherty, K. M.
name: Hora, J.
name: Allen, L. E.
name: Fazio, G. G.
name: Hartmann, L.
name: Myers, P. C.
name: Muzerolle, J.
name: Pipher, J. L.
name: Siegler, N.
name: Stauffer, J. R.
name: Young, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present initial results from a survey of the Orion A and B molecular clouds made with the InfraRed Array Camera (IRAC) onboard the Spitzer Space Telescope. This survey encompasses a total of 5.6 square degrees with the sensitivity to detect objects below the hydrogen burning limit at an age of 1 Myr. These observations cover a number of known star forming regions, from the massive star forming clusters in the Orion Nebula and NGC 2024, to small groups of low mass stars in the L1641. We combine the IRAC photometry with photometry from the 2MASS point source catalog and use the resulting seven band data to identify stars with infrared excesses due to dusty disks and envelopes. Using the presence of an infrared excess as an indicator of youth, we show the distribution of young stars and protostars in the two molecular clouds. We find that roughly half of the stars are found in dense clusters surrounding the two regions of recent massive star formation in the Orion clouds, NGC 2024 and the Orion Nebula.
description: To be published in the proceedings for the IAU Symposium 227, Massive Star Birth: A Crossroads of Astrophysics, A version of the paper can also be found at: http://www-cfa.harvard.edu/irac/publications
Arbitrarily Degenerate Helium White Dwarfs as Donors in AM CVn Binaries
Creators: name: Deloye, Christopher J.
name: Bildsten, Lars
name: Nelemans, Gijs
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We apply the Deloye & Bildsten (2003) isentropic models for donors in ultracompact low-mass X-ray binaries to the AM CVn population of ultracompact, interacting binaries. The mass-radius relations of these systems' donors in the mass range of interest ($M_2<0.1 \msun$) are not single-valued, but parameterized by the donor's specific entropy. This produces a range in the relationships between system observables, such as orbital period, $\Porb$, and mass transfer rate, $\Mdot$. For a reasonable range in donor specific entropy, $\Mdot$ can range over several orders of magnitude at fixed $\Porb$. We determine the unique relation between $\Mdot$ and $M_2$ in the AM CVn systems with known donor to accretor mass ratios, $q=M_2/M_1$. We use structural arguments, as well as each system's photometric behavior, to place limits on $\Mdot$ and $M_2$ in each. Most systems allow a factor of about 3 variation in $\Mdot$, although V803 Cen, if the current estimates of its $q$ are accurate, is an exception and must have $M_2 \approx 0.02 \msun$ and $\Mdot \approx 10^{-10} \msun$ yr$^{-1}$. Our donor models also constrain each donor's core temperature, $T_c$, range and correlate $T_c$ with $M_2$. We examine how variations in donor specific entropy across the white dwarf family \citep{nele01a} of AM CVn systems affects this population's current galactic distribution. Allowing for donors that are not fully degenerate produces a shift in systems towards longer $\Porb$ and higher $\Mdot$ increasing the parameter space in which these systems can be found. This shift increases the fraction of systems whose $\Porb$ is long enough that their gravity wave (GW) signal is obscured by the background of detached double white dwarf binaries that dominate the GW spectrum below a frequency $\approx 2$ mHz.
description: 13 pages, 10 figures, uses emulateapj.cls. Accepted to Astrophysical Journal
Дорога как культурная универсалия в прозе А. П. Чехова
Creators: name: Молнар Ангелика
name: Кондратьева Виктория Викторовна
Publisher: name: Современное педагогическое образование
Year: 2021
Subjects: Чехов
проза
архетип
дорога
пространство

description: В статье рассматривается архетип дороги в прозе А. П. Чехова с точки зрения семантико-функционального аспекта. На материале произведений писателя раскрываются особые смыслы образа дороги через взаимодействие этого топоса с мифологемами жизни и смерти; оппозицией «свой»/ «чужой» и связанными с ним общекультурными мотивами путешествия-преодоления, поисков истины и счастья, а также литературные мотивы упразднения, вхождения в социум. В произведениях А. П. Чехова находят прежде всего воплощение традиционные архетипические смыслы – дорога как жизненный путь человека, как пространство взросления, становления, осознания себя. С этим связаны особые темпоральные качества этого топоса, проявляющиеся активнее, чем в других пространственных единицах: движение в пространстве обнажает временные изменения и ассоциируется с течением человеческой жизни. Также установлено, что в художественном мире А. П. Чехова архетип дороги обладает своеобразными семантическими вариантами, основанными на сочетании укоренившихся в литературе смысловых начал топоса с особенностями авторского видения. По сути, писатель дал свою интерпретацию всех наиболее распространенных типов дорожного сюжета.
QoE-Driven UAV-Enabled Pseudo-Analog Wireless Video Broadcast: A Joint Optimization of Power and Trajectory
Creators: name: Tang, Xiao-Wei
name: Huang, Xin-Lin
name: Hu, Fei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Multimedia (cs.MM)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The explosive demands for high quality mobile video services have caused heavy overload to the existing cellular networks. Although the small cell has been proposed to alleviate such a problem, the network operators may not be interested in deploying numerous base stations (BSs) due to expensive infrastructure construction and maintenance. The unmanned aerial vehicles (UAVs) can provide the low-cost and quick deployment, which can support high-quality line-of-sight communications and have become promising mobile BSs. In this paper, we propose a quality-of-experience (QoE)-driven UAV-enabled pseudo-analog wireless video broadcast scheme, which provides mobile video broadcast services for ground users (GUs). Due to limited energy available in UAV, the aim of the proposed scheme is to maximize the minimum peak signal-to-noise ratio (PSNR) of GUs' video reconstruction quality by jointly optimizing the transmission power allocation strategy and the UAV trajectory. Firstly, the reconstructed video quality at GUs is defined under the constraints of the UAV's total energy and motion mechanism, and the proposed scheme is formulated as a complex non-convex optimization problem. Then, the optimization problem is simplified to obtain a tractable suboptimal solution with the help of the block coordinate descent model and the successive convex approximation model. Finally, the experimental results are presented to show the effectiveness of the proposed scheme. Specifically, the proposed scheme can achieve over 1.6dB PSNR gains in terms of GUs' minimum PSNR, compared with the state-of-the-art schemes, e.g., DVB, SoftCast, and SharpCast.
3D-radiation hydro simulations of disk-planet interactions: I. Numerical algorithm and test cases
Creators: name: Klahr, H.
name: Kley, W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the evolution of an embedded protoplanet in a circumstellar disk using the 3D-Radiation Hydro code TRAMP, and treat the thermodynamics of the gas properly in three dimensions. The primary interest of this work lies in the demonstration and testing of the numerical method. We show how far numerical parameters can influence the simulations of gap opening. We study a standard reference model under various numerical approximations. Then we compare the commonly used locally isothermal approximation to the radiation hydro simulation using an equation for the internal energy. Models with different treatments of the mass accretion process are compared. Often mass accumulates in the Roche lobe of the planet creating a hydrostatic atmosphere around the planet. The gravitational torques induced by the spiral pattern of the disk onto the planet are not strongly affected in the average magnitude, but the short time scale fluctuations are stronger in the radiation hydro models. An interesting result of this work lies in the analysis of the temperature structure around the planet. The most striking effect of treating the thermodynamics properly is the formation of a hot pressure--supported bubble around the planet with a pressure scale height of H/R ~ 0.5 rather than a thin Keplerian circumplanetary accretion disk. We also observe an outflow of gas above and below the planet during the gap opening phase.
description: 14 pages, 15 figures, A&A in press
Dynamics of coherence: Maximal quantum Fisher information vs. Loschmidt echo
Creators: name: Cheraghi, Hadi
name: Mahdavifar, Saeed
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider the dynamics of maximal quantum Fisher information (MQFI) after sudden quenches for the one-dimensional transverse-field Ising model. Our results show, the same as Loschmidt echo, there is a universality for the revival times i.e., they do not depend on the initial state and the size of the quench and are given by integer multiples of $T_{rev} \simeq \frac{N}{2v_{max }}$, where $N$ is the system size and $v_{max }$ is the maximal group velocity of quasiparticles. Critically enhanced and decreased at revival and decay times as $T_{rev} \equiv T_{dec} $ are characterized by quenching from the order and disorder phases into the quantum phase transition respectively, that can be utilized to detect the quantum critical point (QCP). In some quenches crossed from the QCP, nonanalytic behaviors appear at some times due to the turning of the local observable from one direction to another because of identifying the maximum value. We name this phenomenon \textit{the dynamical MQFI transitions}, occurring at the critical times $t_c$. Interestingly, although no Fisher zero exists in the dynamics of MQFI, the first critical time emerged from the dynamical quantum phase transition is equal to the first time whose the logarithm of MQFI is minimum. In addition, we unveil the long-time run of MQFI indicates a signature of a nonequilibrium quantum phase transition at the QCP. We also discuss the probability of arising of macroscopic superpositions in the nonequilibrium dynamics of the system.
description: 10 pages, 8 figures, will appear in Phys. Rev. B
Soft Errors Detection and Automatic Recovery based on Replication combined with different Levels of Checkpointing
Creators: name: Montezanti, Diego
name: Rucci, Enzo
name: De Giusti, Armando
name: Naiouf, Marcelo
name: Rexachs, Dolores
name: Luque, Emilio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Handling faults is a growing concern in HPC. In future exascale systems, it is projected that silent undetected errors will occur several times a day, increasing the occurrence of corrupted results. In this article, we propose SEDAR, which is a methodology that improves system reliability against transient faults when running parallel message-passing applications. Our approach, based on process replication for detection, combined with different levels of checkpointing for automatic recovery, has the goal of helping users of scientific applications to obtain executions with correct results. SEDAR is structured in three levels: (1) only detection and safe-stop with notification; (2) recovery based on multiple system-level checkpoints; and (3) recovery based on a single valid user-level checkpoint. As each of these variants supplies a particular coverage but involves limitations and implementation costs, SEDAR can be adapted to the needs of the system. In this work, a description of the methodology is presented and the temporal behavior of employing each SEDAR strategy is mathematically described, both in the absence and presence of faults. A model that considers all the fault scenarios on a test application is introduced to show the validity of the detection and recovery mechanisms. An overhead evaluation of each variant is performed with applications involving different communication patterns; this is also used to extract guidelines about when it is beneficial to employ each SEDAR protection level. As a result, we show its efficacy and viability to tolerate transient faults in target HPC environments.
description: 26 pages, 3 figures (1 and 2 with subfigures), 4 tables, sent to review to Future Generation Computer Systems
Theory of Raman scattering on electron-doped high-$T_c$ superconductor
Creators: name: Liu, C. S.
name: Luo, H. G.
name: Wu, W. C.
name: Xiang, T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have analyzed the $B_{1g}$ and $B_{2g}$ Raman spectra of electron-doped cuprate superconductors Nd$_{2-x}$Ce$_{x}$CuO$_4$ and Pr$_{2-x}$Ce$_{x}$CuO$_4$ using a weakly coupled two-band model. One of these two bands is centered around $(\pm π/2, \pm π/2)$ and couples more strongly with the $B_{2g}$ mode, while the other is centered around $(\pm π, 0)$ and $(0, \pm π)$ and couples more strongly with the $B_{1g}$ mode. This model explains in a natural way why the $B_{2g}$ Raman peak occurs at a higher frequency than the $B_{1g}$ one at optimal doping, and how these two peaks change with doping in agreement with experiments. Our result suggests that the superconducting pairing in electron-doped high-$T_c$ cuprates has the $d_{x^2-y^2}$-wave symmetry and results from the same mechanism as for hole doped materials.
description: 5 RevTeX4 pages, 3 EPS figures, replaced with published version (two tables added)
Additional file 4 of Comorbidity patterns and socioeconomic inequalities in children under 15 with medical complexity: a population-based study
Creators: name: Carrilero, Neus
name: Dalmau-Bueno, Albert
name: García-Altés, Anna
Publisher: name: figshare
Year: 2020
Subjects: subject: Space Science
subject: Medicine
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Additional file 4. Prevalences of all disease categories by sex for each comorbidity class among the CMC in Catalonia, 2016. Description of data: Prevalences of all the disease categories for each of the comorbidity classes obtained in the LCA. This data shows the frequencies and percentages of each disease category by sex for each of the classes obtained.
Laser spectroscopy of some transition metal-containing free radicals
Creators: name: Kingston, Christopher Thomas
Publisher: name: University of British Columbia
Year: 2009

description: Laser induced fluorescence (LIF) studies have been performed on the transition metal-containing free radicals nickel cyanide (NiCN), niobium oxide (NbO), niobium methylidyne (NbCFf) and tantalum methylidyne (TaCH). All molecules were produced by the reaction of laser-ablated metal atoms with a reactant gas under supersonic jet-cooled conditions. Precise rotational constants and bond lengths have been obtained for the X₁²Δ[sub 5/2] state of NiCN. The vibrational structure "of this state is dominated by a Fermi resonance interaction, as are those of the low-lying X₂²Δ[sub 3/2] and W₁²Π[sub 3/2] states. Four excited electronic states have been identified, showing that the electronic structure of NiCN is remarkably similar to that of NiH. High resolution spectra of NbO have given the rotational and hyperfine constants for the levels v=0-3 of the B⁴Π state. Strong irregularities in the vibrational dependences of these constants can be interpreted in terms of spin-orbit interaction between the B⁴Π state and the f²Π , e²Φ and d²Δ states. The hitherto unknown ⁴Δ state is estimated to lie near 17500 cm⁻¹, from the vibrational dependence of the spin-rotation parameter γ of the B⁴Π state. Thorough vibrational, rotational and hyperfine analyses were performed on the X³Δ[sub I] state of NbCH. The hyperfine widths of this state vary considerably as a result of spinuncoupling. The A³Φ₂ and B³Δ₁ excited states are heavily perturbed, with as many as nine levels appearing where only one is expected, which complicates the vibrational and rotational analyses. Tantalum methylidyne was found to have an X Ω=0⁺ (¹Σ⁺) ground state, with bond lengths r₀(Ta-C)=1.7714 Å and r0(C-H)= 1.080 Å. The rotational lines exhibit unusually large quadrupole hyperfine splittings caused by the nuclear spin, 1=7/2, of the ¹⁸¹Ta nucleus. This effect is normally too small to appear in optical spectra. Interaction between the A Ω=1 (¹Π) and B Ω=0+ (³Π₀[sub +]) states has been identified through the transfer of magnetic hyperfine character to the B state from A.
Phase Change Material Photonics
Creators: name: Simpson, Robert E.
name: Cao, Tun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the last decade phase change materials (PCM) research has switched from practical application in optical data storage toward electrical phase change random access memory technologies (PCRAM). As these devices are commercialised, we expect the research direction to switch once again toward electrical-photonic devices. The objective of this review is to introduce the concepts in PCM-tuned photonics. We will start by highlighting the key works in the field, before concentrating on PCM-tuned Metal-Dielectric-Metal (MDM) structures. We will discuss how to design tuneable-MDM photonics devices, their advantages, and their limitations. Finally we will discuss new materials for phase change photonics.
description: 28 pages, 14 figures, adapted from a chapter to be published in the World Scientific Reference of Amorphous Materials
Профессиональная готовность студентов – будущих учителей к исследовательской деятельности
Creators: name: Скрипникова Татьяна Ивановна
Publisher: name: Современное педагогическое образование
Year: 2021
Subjects: исследовательская компетенция/компетентность
научно-исследовательская деятельность студентов
учебно-исследовательская деятельность учащихся
профессиональная готовность студентов-будущих учителей к исследовательской деятельности

description: В статье рассматривается значимость исследовательского компонента в содержании вузовской подготовки будущих учителей. Проводится сопоставительный анализ научно-исследовательской деятельности студентов и учебно-исследовательской деятельности учащихся и на этой основе делается вывод о необходимости формирования профессиональной готовности к исследовательской деятельности студентов-будущих учителей. Анализируются современные подходы к описанию структурно-компонентного состава исследовательской компетентности будущего учителя. Разработано структурно-компонентное содержание профессиональной готовности к исследовательской деятельности как двухуровневого образования, включающего готовность студентов – будущих учителей к осуществлению научно-исследовательской деятельности в образовательной сфере и готовность руководить учебно-исследовательской деятельностью учащихся. В состав первого уровня профессиональной готовности входят мотивационный, когнитивный, технологический, эмоционально-оценочный и креативный компоненты. Компонентами второго уровня являются гностический, конструктивно-планирующий, организаторский и коммуникативный.
Competing order and the asymmetric tunneling spectrum in high temperature cuprate superconductors
Creators: name: Hu, Jiang-Ping
name: Seo, Kangjun
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that the asymmetric tunneling spectrum observed in the cuprate superconductors stems from the existence of a competing order. The competition between the competing order and superconductivity can create a charge depletion region near the surface. The asymmetric response of the depletion region as the function of the external voltage causes the asymmetric tunneling spectrum. The effect is very general in a system which is near the phase boundary of two competing states favoring different carrier densities. The asymmetry which has recently been observed in the point-contact spectroscopy of the heavy fermion superconductor CeCoIn5 is another example of this effect.
Формирование у студентов содержательного обобщения в процессе решения комбинаторных задач
Creators: name: Булатова Вера Борисовна
name: Бадеев Александр Валерьевич
name: Рыбдылова Дарима Доржиевна
Publisher: name: Современное педагогическое образование
Year: 2021
Subjects: обучение решению задач
анализ задачи
существенное свойство
содержательное обобщение
высшее образование
комбинация
комбинаторная задача

description: Статья посвящена вопросу формирования у студентов образовательных учреждений высшего образования содержательного обобщения в процессе обучения решению комбинаторных задач. Выполняя анализ задач, учащиеся должны выявлять существенные свойства и связи, имеющиеся в них, и на этой основе выполнять обобщение, то есть выполнять содержательное обобщение. Многие студенты склонны идти к обобщению эмпирическим путем, хотя для этого требуется решить много частных задач. В результате они не всегда приходят к четкому, полному пониманию способа решения. Рациональнее и надежнее идти путем содержательного обобщения. Поэтому формирование у учащихся именно содержательного обобщения – одна из важных задач обучения студентов. При организации деятельности учащихся по анализу комбинаторных задач авторами предлагается использовать модели описанных в условиях задач комбинаций, сопоставление комбинаций и соответствующих моделей, сравнение моделей и сравнение комбинаций, варьирование несущественных признаков рассматриваемых комбинаций. Анализируя задачу, учащиеся часто выявляют как существенные свойства и связи, так и несущественные. При построении модели они абстрагируются от несущественного, представляют структуру задачи. Сравнивая комбинации и модели, рассматривая разные задачи одного класса, они выделяют существенные связи и отношения между данными. В результате анализа задач учащиеся выделяют в них суть каждого вида комбинаций, их существенные признаки, существенные отношения. Они вникают в суть задачи, выполняют содержательное обобщение и определяют принцип или способ её решения. На основе выявления внутренних существенных связей задач они выделяют их в один класс и определяют общий способ их решения. Описанная организация анализа задач с использованием предлагаемых методов способствует формированию содержательного обобщения.
Медиа-контент в современной профессиональной музыкальной образовательной среде: к вопросу об альтернативных видах музыкальных иллюстраций и практического материала для анализа музыкальных произведений
Creators: name: Морозова Олеся Петровна
name: Кучер Наталья Юрьевна
name: Титова Светлана Сергеевна
Publisher: name: Современное педагогическое образование
Year: 2021
Subjects: медиа-контент
образовательный процесс в образовательных организациях сферы культуры и искусства
музыкальное образование
анализ музыкальных произведений
цитирование и двойное (цепное) цитирование образцов мировой музыкальной классики

description: Статья посвящена рассмотрению альтернативных видов музыкальных иллюстраций и практического материала для анализа музыкальных произведений. В качестве поля исследования избраны образцы современного медиа-контента, в котором применяется метод цитирования музыкальных произведений, представляющих мировое классическое наследие. В настоящей работе данные образцы классифицированы по различным основаниям, а также рассмотрены условия и даны практические рекомендации по использованию образцов медиа-контента в учебном процессе образовательных организаций сферы культуры и искусства – профессионального и дополнительного художественного образования. Кроме того, в статье рассмотрены конкретные примеры образцов медиа-контента и особенности цитирования данных произведений.
Дидактические аспекты комплексного применения средств обучения в современном учебно-воспитательном процессе
Creators: name: Лысенко Алексей Сергеевич
Publisher: name: Современное педагогическое образование
Year: 2021
Subjects: учебно-воспитательный процесс
средства обучения
учебное оборудование
дидактические условия
восприятие информации
эмерджентность свойств
комплекс средств обучения
комплексное применение средств обучения

description: В статье рассматривается ряд особенностей современной образовательной среды с позиций применения учебного оборудования. Указаны дидактические условия и предпосылки комплексного применения средств обучения. Проанализирована взаимосвязь психологических закономерностей восприятия информации и средств обучения. Рассмотрены условия, определяющие выявление наиболее существенных аспектов учебного содержания. С позиций комплексного подхода представлена проблема формирования системы средств обучения. Также рассмотрены основные особенности и характерные признаки комплексного применения средств обучения. Выявлены условия реализации комплексного применения средств обучения и условия эффективного применения комплексов. Рассмотрена последовательность операций, лежащих в основе комплексного обеспечения учебно-воспитательного процесса определенными средствами. Указаны условия эффективности учебно-воспитательного процесса с позиций комплексного применения средств обучения. Определены факторы, влияющие на выбор учебного оборудования. Описывается порядок формирования комплексов средств обучения.
title: Συγκριτική αξιολόγηση κατανεμημένων συστημάτων ανίχνευσης σημείου μέγιστης ισχύος φωτοβολταϊκών συστοιχιών
title: Comparative evaluation of distributed maximum power point tracking systems of photovoltaic arrays
Creators: name: Αλμπαντης Αναστασιος
Publisher: name: Technical University of Crete
Year: 2021

description: Η παραγωγή ηλεκτρικής ενέργειας των φωτοβολταϊκών συστοιχιών που εγκαθίστανται σε κτίρια επηρεάζεται από τη σκίαση που προκαλείται σε αυτές από γειτονικές επιφάνειες, αντικείμενα του περιβάλλοντος χώρου κλπ. Σε αυτή τη διπλωματική εργασία εξετάζεται η λειτουργία κατανεμημένων συστημάτων ανίχνευσης του σημείου μέγιστης ισχύος φωτοβολταϊκών συστοιχιών, που έχουν σκοπό τη μεγιστοποίηση της ενέργειας που παράγουν τα φωτοβολταϊκά συστήματα όταν λειτουργούν σε συνθήκες μερικής σκίασης. Μελετήθηκαν εναλλακτικές διατάξεις που διαφέρουν μεταξύ τους τόσο ως προς τα ηλεκτρονικά κυκλώματα ισχύος των μετατροπέων που χρησιμοποιούνται για τη διαχείριση της ενέργειας που παράγεται από την φωτοβολταϊκή συστοιχία, όσο και ως προς τους αλγορίθμους ελέγχου της λειτουργίας των μετατροπέων ισχύος. Χρησιμοποιώντας την πλατφόρμα MATLAB/Simulink, πραγματοποιήθηκαν προσομοιώσεις αυτών των αρχιτεκτονικών κατανεμημένων συστημάτων ανίχνευσης του σημείου μέγιστης ισχύος και αξιολογήθηκε η ενεργειακή τους απόδοση για εναλλακτικά σενάρια μερικής σκίασης της φωτοβολταϊκής συστοιχίας που περιλαμβάνουν.
Deconfinement, naturalness and the nuclear-quark equation of state
Creators: name: Rezaeian, Amir H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Baryon-loops vacuum contribution in renormalized models like the Linear sigma model and the Walecka model give rise to large unnatural interaction coefficients, indicating that the quantum vacuum is not adequately described by long-range degrees of freedom. We extend such models into nonrenormalizable class by introducing an ultraviolet cutoff into the model definition and treat the Dirac-sea explicitly. In this way, one can avoid unnaturalness. We calculate the equation of state for symmetric nuclear matter at zero temperature in a modified $σ-ω$ model. We show that the strong attraction originating from the Dirac-sea softens the nuclear matter equation of state and generates a vacuum with dynamically broken symmetry. In this model the vector-meson is important for the description of normal nuclear matter, but it obstructs the chiral phase transition. We investigate the chiral phase transition in this model by incorporating deconfinement at high density. A first-order quark deconfinement is simulated by changing the active degrees of freedom from nucleons to quarks at high density. We show that the chiral phase transition is first-order when quark decouples from the vector-meson and coincides with the deconfinement critical density.
description: 18 pages (RevTeX), 4 figures (eps), typos corrected, references added
Non-local 2D Generalized Yang-Mills theories on arbitrary surfaces with boundary
Creators: name: Saaidi, Khaled
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The non-local generalized two dimensional Yang Mills theories on an arbitrary orientable and non-orientable surfaces with boundaries is studied. We obtain the effective action of these theories for the case which the gauge group is near the identity, $U\simeq I$. Furthermore, by obtaining the effective action at the large-N limit, it is shown that the phase structure of these theories is the same as that obtain for these theories on orientable and non-orientable surface without boundaries. It is seen that the $ϕ^2$ model of these theories on an arbitrary orientable and non-orientable surfaces with boundaries have third order phase transition only on $g=0$ and $r=1$ surfaces, with modified area $\tilde{A}+{\cal A}/2$ for orientable and $\bar{A}+\mathcal{A}$ for non-orientable surfaces respectivly.
description: 10 pages, no figures, latex
Steady-State Electrostatic Layers from Weibel Instability in Relativistic Collisionless Shocks
Creators: name: Milosavljevic, Milos
name: Nakar, Ehud
name: Spitkovsky, Anatoly
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is generally accepted that magnetic fields generated in the nonlinear development of the transverse Weibel instability provide effective collisionality in unmagnetized collisionless shocks. Recently, extensive two and three dimensional simulations improved our understanding of the growth and saturation of the instability in colliding plasma shells. However, the steady-state structure of the shock wave transition layers remains poorly understood. We use basic physical considerations and order-of-magnitude arguments to study the steady state structure in relativistic unmagnetized collisionless shocks in pair plasmas. The shock contains an electrostatic layer resulting from the formation of stationary, magnetically-focused current filaments. The filaments form where the cold upstream plasma and the counterstreaming thermal plasma interpenetrate. The filaments are not entirely neutral and strong electrostatic fields are present. Most of the downstream particles cannot cross this layer into the upstream because they are trapped by the electrostatic field. We identify the critical location in the shock transition layer where the electromagnetic field ceases to be static. At this location, the degree of charge separation in the filaments reaches a maximum value, the current inside the filaments comes close to the Alfvén limit, and the phase space distribution function starts to isotropize. We argue that the radius of the current filaments upstream of the critical location is about twice the upstream plasma skin depth. Finally, we show that some downstream particles cross the electrostatic layer and run ahead of the shock into the preshock medium without causing instability. These particles may play an important role in particle acceleration.
description: 9 pages, 3 figures, comments welcome
Ontology-Based Users & Requests Clustering in Customer Service Management System
Creators: name: Smirnov, Alexander
name: Pashkin, Mikhail
name: Chilov, Nikolai
name: Levashova, Tatiana
name: Krizhanovsky, Andrew
name: Kashevnik, Alexey
Publisher: name: arXiv
Year: 2005
Subjects: subject: Information Retrieval (cs.IR)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences
subject: H.3.3

description: Customer Service Management is one of major business activities to better serve company customers through the introduction of reliable processes and procedures. Today this kind of activities is implemented through e-services to directly involve customers into business processes. Traditionally Customer Service Management involves application of data mining techniques to discover usage patterns from the company knowledge memory. Hence grouping of customers/requests to clusters is one of major technique to improve the level of company customization. The goal of this paper is to present an efficient for implementation approach for clustering users and their requests. The approach uses ontology as knowledge representation model to improve the semantic interoperability between units of the company and customers. Some fragments of the approach tested in an industrial company are also presented in the paper.
description: 15 pages, 4 figures, published in Lecture Notes in Computer Science
Ownership Structure in the Post-Privatized Brazilian Steel Industry: Complexity, Instability and the Lingering Role of the State
Creators: name: Amann, Edmund
name: Ferraz, Joao Carlos
name: Amann, Edmund
name: Ferraz, Joao Carlos
Publisher: name: Unknown
Year: 2004
Subjects: subject: Industrial Organization
subject: Brazil
subject: Latin America
subject: Privatization
subject: Corporate Ownership
subject: Role of the State

description: This article examines the impacts of privatization on patterns of ownership structure and the role of the State in the Brazilian steel industry. Following a review of the theoretical literature our empirical analysis suggests that the results of privatization on the sector have been considerably more complex and nuanced than might have been expected. In particular we find that privatization has been associated with increasing complexity and instability in patterns of corporate ownership. At the same time, the State, far from withdrawing to the regulatory sidelines, has continued to play an active role both as a lender and as an important indirect investor.
Building Bases of Loop Integrands
Creators: name: Bourjaily, Jacob L.
name: Herrmann, Enrico
name: Langer, Cameron
name: Trnka, Jaroslav
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We describe a systematic approach to the construction of loop-integrand bases at arbitrary loop-order, sufficient for the representation of general quantum field theories. We provide a graph-theoretic definition of `power-counting' for multi-loop integrands beyond the planar limit, and show how this can be used to organize bases according to ultraviolet behavior. This allows amplitude integrands to be constructed iteratively. We illustrate these ideas with concrete applications. In particular, we describe complete integrand bases at two loops sufficient to represent arbitrary-multiplicity amplitudes in four (or fewer) dimensions in any massless quantum field theory with the ultraviolet behavior of the Standard Model or better. We also comment on possible extensions of our framework to arbitrary (including regulated) numbers of dimensions, and to theories with arbitrary mass spectra and charges. At three loops, we describe a basis sufficient to capture all `leading-(transcendental-)weight' contributions of any four-dimensional quantum theory; for maximally supersymmetric Yang-Mills theory, this basis should be sufficient to represent all scattering amplitude integrands in the theory---for generic helicities and arbitrary multiplicity.
description: 76 pages, 6 tables, hundreds of figures. Ancillary file includes our results for three loops
Creating the Conditions for International Business Expansion: The Impact of Regulation on Economic Growth in Developing Countries - A Cross-Country Analysis
Creators: name: Jalilian, Hossein
name: Kirkpatrick, Colin
name: Parker, David
name: Jalilian, Hossein
name: Kirkpatrick, Colin
name: Parker, David
Publisher: name: Unknown
Year: 2003
Subjects: Public Economics

description: The role of an effective regulatory regime in promoting economic growth and development and therefore international business has generated considerable interest among researchers and practitioners in recent years. In particular, building effective regulatory structures in developing countries is not simply an issue of the technical design of the most appropriate regulatory instruments, it is also concerned with the quality of supporting regulatory institutions and capacity. Many of the institutions that support markets are publicly provided and the effectiveness of these regulatory institutions can be expected to be an important determinant of how well markets function. This paper explores the role of regulation in affecting economic outcomes using an econometric model of the impact of regulatory governance. More precisely, it assesses through econometric modelling the impact of variations in the quality of regulatory governance on economic growth. Proxies for regulatory quality are included as determinants of economic growth. The results based on two different techniques of estimation suggest a strong causal link between regulatory quality and economic performance. The results confirm that "good" regulation is associated with higher economic growth, which in turn is conducive to the expansion of international business.
Dissociative attachment of an electron to a molecule: kinetic theory
Creators: name: Rossani, A.
name: Scarfone, A. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Test particles interact with a medium by means of a bimolecular reversible chemical reaction. Two species are assumed to be much more numerous so that they are distributed according fixed distributions: Maxwellians and Dirac's deltas. Equilibrium and its stability are investigated in the first case. For the second case, a system is constructed, in view of an approximate solution.
description: 5 pages, 1 figure, RevTeX4; contribution to the international conference "Next Sigma Phi" on News, EXpectations, and Trends in statistical physics, Crete 2005
Additional file 3 of Comorbidity patterns and socioeconomic inequalities in children under 15 with medical complexity: a population-based study
Creators: name: Carrilero, Neus
name: Dalmau-Bueno, Albert
name: García-Altés, Anna
Publisher: name: figshare
Year: 2020
Subjects: subject: Space Science
subject: Medicine
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Additional file 3. LCA statistics. Description of data: LCA statistics for all the models used. It included Chisq Chi_square goodness of fit, Bayesian Information Criterion, Akaike’s Information Criterion, Log_likelihood, Consistent Alkaike’s Information Criterion and Likelihood Ratio chi-square.
Additional file 2 of Comorbidity patterns and socioeconomic inequalities in children under 15 with medical complexity: a population-based study
Creators: name: Carrilero, Neus
name: Dalmau-Bueno, Albert
name: García-Altés, Anna
Publisher: name: figshare
Year: 2020
Subjects: subject: Space Science
subject: Medicine
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Additional file 2. List of the Clinical Classifications Software (CCS) for ICD-9-MC. included in each disease category (covering 90.6% of all the disease events). Description of data: Clinical codes included in each disease category.
The Advance of the Regulatory State Regulatory Reforms in the Arab World and Latin America Compared
Creators: name: Levi-Faur, David
name: Levi-Faur, David
Publisher: name: Unknown
Year: 2004
Subjects: Public Economics

description: While there is growing recognition of the role of emulation in the policy process in general and in policy transfer in particular there are only limited efforts to model it in a systematic way. This paper takes this challenge through a temporal analysis of the role of contagion in the diffusion of liberalization across countries and sectors. It offers a formal model where one's preferences, strategies and payoffs are dependent on others and where political and policy outcomes are the result of imitation and contagious behaviour. The model is examined against the advance of reforms in seventeen Latin America and their stagnation in seventeen Mediterranean countries. The empirical research cover eight indicators for electricity reforms (commercialisation, legislation, regulatory agency, independence of regulatory agency, IPPs, vertical and horizontal divestiture, privatisation of generation and privatisation of distribution) and eight indicators for telecommunications (commercialisation, legislation, regulatory agency, independence of regulatory agency, competition in international telecoms, privatisation of cellular market, privatisation of incumbent, competition in local loop). On the basis of these indicators a general grade for the effectiveness of the reforms is developed and is given to each country in each of the two sectors. The comparative method is than applied in order to examine within-region and cross-region variations and commonalities in order to shed some light on the obstacles for the advance and effectiveness of reforms.
Large-D Expansion from Variational Perturbation Theory
Creators: name: Brandt, Sebastian F.
name: Pelster, Axel
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive recursively the perturbation series for the ground-state energy of the D-dimensional anharmonic oscillator and resum it using variational perturbation theory (VPT). From the exponentially fast converging approximants, we extract the coefficients of the large-D expansion to higher orders. The calculation effort is much smaller than in the standard field-theoretic approach based on the Hubbard-Stratonovich transformation.
description: Author Information under http://hbar.wustl.edu/~sbrandt and http://www.theo-phys.uni-essen.de/tp/ags/pelster_dir
Farmland transfers in KwaZulu-Natal, 1997-2003: A focus on land redistribution including restitution
Creators: name: Lyne, Michael C.
name: Ferrer, Stuart R.D.
name: Lyne, Michael C.
name: Ferrer, Stuart R.D.
Publisher: name: Unknown
Year: 2006
Subjects: Land Economics/Use

description: Census surveys of land transactions show that 203,300 hectares of KwaZulu-Natal's commercial farmland transferred to previously disadvantaged South Africans over the period 1997-2003. This represents 3.8 per cent of the farmland originally available for redistribution in 1994. The annual rate of land redistribution in the province fell from a peak of 1.06 per cent in 2002 to 0.41 per cent in 2003, following an increase in the real price of farmland. Transactions financed only with government grants accounted for almost one-half of the redistributed farmland. However, the quality of farmland financed with grants awarded under government's land redistribution programme was poor relative to that financed privately. The LRAD programme introduced in 2001 improved government's contribution to land reform, attracting private capital and expertise into the process. Unfortunately, the number of transactions financed with a combination of LRAD grants and mortgage loans fell from 14 in 2002 to just six in 2003. It is recommended that all reputable banks (and not just the Land Bank) should be allowed to approve LRAD grants for eligible clients. Previously disadvantaged women gained less land, and much less land wealth, than did their male counterparts. Somewhat surprisingly, women were well represented in transactions financed by Ithala Finance and Investment Corporation to establish emerging sugarcane farmers. However, the same was not true of clients financed by the Land Bank.
Disk eccentricity and embedded planets
Creators: name: Kley, Wilhelm
name: Dirksen, Gerben
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the response of an accretion disk to the presence of a perturbing protoplanet embedded in the disk through time dependent hydrodynamical simulations. The disk is treated as a two-dimensional viscous fluid and the planet is kept on a fixed orbit. We run a set of simulations varying the planet mass, and the viscosity and temperature of the disk. All runs are followed until they reach a quasi-equilibrium state. We find that for planetary masses above a certain minimum mass, already 3 M_Jup for a viscosity of nu = 10^{-5}, the disk makes a transition from a nearly circular state into an eccentric state. Increasing the planetary mass leads to a saturation of disk eccentricity with a maximum value of around 0.25. The transition to the eccentric state is driven by the excitation of an m=2 spiral wave at the outer 1:3 Lindblad resonance. The effect occurs only if the planetary masses are large enough to clear a sufficiently wide and deep gap to reduce the damping effect of the outer 1:2 Lindblad resonance. An increase in viscosity and temperature in the disk, which both tend to close the gap, have an adverse influence on the disk eccentricity. In the eccentric state the mass accretion rate onto the planet is greatly enhanced, an effect that may ease the formation of massive planets beyond about 5 M_Jup that are otherwise difficult to reach.
description: 9 Pages, 9 Figures, A&A in press, additional material under http://www.tat.physik.uni-tuebingen.de/~kley/publ/paper/eccdisk.html
Re-imagining a future for South African agriculture
Creators: name: Karaan, Mohammad
name: Karaan, Mohammad
Publisher: name: Unknown
Year: 2006
Subjects: Agricultural and Food Policy

description: Agricultural policy in the past was characterized by elementary objectives such as stabilisation, protectionism, deregulation and producer interests. Future policy direction faces the complexity associated with post-modernism. In this regard, global markets are considered increasingly saturated, unfair, inequitable, volatile, concentrated and dominated by supply chains and retailers. Agricultural firms are moving beyond a producer orientation towards firms that focus on creating value from size, non-farm business, service orientation, more open management style, greater human capital, accelerated self-renewal, innovation, marginalizing commodities, retaining and unlocking further value from traditional business. Furthermore, contemporary issues like land reform and empowerment remain key challenges but suffer from deficiencies in bureaucracy, beneficiary selection, forms of ownership, and generally incentives to engage markets. Empowerment efforts however favour asset acquisition instead of human capital formation and entrepreneurship. Addressing these challenges requires a reconceptualisation of the role of the state and markets. The argument strongly advanced is for greater integration between state and market whereby markets are incentivised to perform and execute economic programmes.