cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
РАЗРАБОТКА ЭФФЕКТИВНОЙ ТЕХНОЛОГИИ ИЗВЛЕЧЕНИЯ МЕДИ ИЗ КОНВЕРТОРНЫХ ШЛАКОВ
Creators: name: Хожиев Шохрух Тошпулатович
Publisher: name: Journal of Advances in Engineering Technology
Year: 2020
Subjects: медь
шлак
штейн
отходы отработанных автомобильных шин
обеднение шлака
восстановление магнетита
сульфидирование окисленных соединений меди
ковш
плавильная печь.
copper
slag
matte
waste of used car tires
depletion of slag
reduction of magnetite
sulfidation of oxidized copper compounds
ladle
smelting furnace

description: В статье рассматриваются проблемы снижения потерь меди с отвальными шлаками. Предлагается комплексные решение проблемы с применение физико-химических методов воздействия на расплав. Показано, что успех объединительного процесса зависит от сульфидирования окисленных соединений меди, восстановления магнетита в шлаке до вюстита и создания условий для коалесценции мелких капель штейна. Создание этих условий дает возможность снизить остаточную концентрацию меди до примененного уровня. При этом может быть получен бедный штейн, который переработан заливкой их в плавильные печи. Обедненный шлак является отвальным продуктам и может быть реализован в строительную индустрию. Фактически это дает возможность отказаться от создания шлаковых отвалов.
description: The article discusses the problems of reducing copper losses with waste slag. A comprehensive solution to the problem with the use of physico-chemical methods of influence on the melt is proposed. It is shown that the success of the depletion process depends on the sulfidation of oxidized copper compounds, the reduction of magnetite in the slag to wustite, and the creation of conditions for the coalescence of small drops of matte. The creation of these conditions makes it possible to reduce the residual concentration of copper to the applied level. In this case, poor matte can be obtained, which is processed by pouring them into melting furnaces. Depleted slag is a waste product and can be implemented in the construction industry. In fact, this makes it possible to abandon the creation of slag dumps.
Singular perturbation of manifold-valued maps with anisotropic energy
Creators: name: Contreras, Andres
name: Lamy, Xavier
Publisher: name: arXiv
Year: 2018
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35J47

description: We establish small energy Hölder bounds for minimizers $u_\varepsilon$ of \[E_\varepsilon (u):=\int_ΩW(\nabla u)+ \frac{1}{\varepsilon^2} \int_Ωf(u),\] where $W$ is a positive definite quadratic form and the potential $f$ constrains $u$ to be close to a given manifold $\mathcal N$. This implies that, up to subsequence, $u_\varepsilon$ converges locally uniformly to an $\mathcal N$-valued $W$-harmonic map, away from its singular set. We treat general energies, covering in particular the 3D Landau-de Gennes model for liquid crystals, with three distinct elastic constants. Similar results are known in the isotropic case $W(\nabla u)=\vert \nabla u\vert^2$ and rely on three ingredients: a monotonicity formula for the scale-invariant energy on small balls, a uniform pointwise bound, and a Bochner equation for the energy density. In the level of generality we consider, all of these ingredients are absent. In particular, the lack of monotonicity formula is an important reason why optimal estimates on the singular set of $W$-harmonic maps constitute an open problem. Our novel argument relies on showing appropriate decay for the energy on small balls, separately at scales smaller and larger than $\varepsilon$: the former is obtained from the regularity of solutions to elliptic systems while the latter is inherited from the regularity of $W$-harmonic maps. This also allows us to handle physically relevant boundary conditions for which, even in the isotropic case, uniform convergence up to the boundary was open.
description: The initial proof of the energy improvement lemma 2.2 contained a gap and has been corrected in this new version
Vários, Mariologia Conciliar. Estúdios Marianos. Segunda Epoca. Vols. XXX e XXXI. Ed. Sociedade Mariológica Española. 2 Vols. de 341 e 349 ps. 145x205. Madrid 1968
Creators: name: Faria, Manuel Ferreira De
Publisher: name: Theologica
Year: 1969

description: Theologica, v. 4 n. 4 (1969)
Symmetry protected phases in inhomogeneous spin chains
Creators: name: de Buruaga, Nadir Samos Sáenz
name: Santalla, Silvia N.
name: Rodríguez-Laguna, Javier
name: Sierra, Germán
Publisher: name: arXiv
Year: 2018
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It has been shown recently that inhomogenous spin chains can exhibit exotic phenomena such as the breaking of the area law of the entanglement entropy. An example is given by the rainbow model where the exchange coupling constants decrease from the center of the chain. Here we show that by folding the chain around its center, the long-range entanglement becomes short-range which can lead to topological phases protected by symmetries (SPT). The phases are trivial for bond-centered foldings, and non trivial for site-centered ones. In the latter case, the folded spin 1/2 chain with $U(1)$ symmetry belongs to the Su-Schrieffer-Heeger class, while the folded chain with $SU(2)$ symmetry is in the Haldane phase. Finally, we extend these results to higher spin chains where we find a correspondence between the symmetry protection of gapped and gapless phases.
description: 11 pages (5 pages of main text and 6 pages of supplemental materials), 9 figures
IMPACT OF SECONDARY SCHOOL TEACHERS' SELF-EFFICACY ON THEIR OCCUPATIONAL COMMITMENT IN BALOCHISTAN, PAKISTAN
Creators: name: FAZAL-UR-REHMAN
name: Dr. SYED AFZAL SHAH
Publisher: name: Zenodo
Year: 2023
Subjects: Assessing, Impact, Teachers, Self-efficacy and Occupational Commitment

description: Abstract
This quantitative study investigates effects of self-efficacy on occupational commitment of teachers in Balochistan. The study's objectives are to find out opinion of teachers about their self-efficacy on occupational commitment. A quantitative, non-experimental, predictive correlational research design was used to achieve the study's objectives. Government secondary-school teachers and students of Balochistan are selected for this study. A sample of 640 teachers and 640 students is selected through a multistage sampling technique. The Teacher Self-efficacy Scale developed by Tschannen-Moran and Hoy (2001), and self-developed questionnaire of occupational commitment are used for the collection of data. Likewise, a multiple regression model is also used to explore the effects of self-efficacy of teachers on occupational commitment. For reliability and validity of the data, the self-developed questionnaire was sent to experts for review and pilot test. Descriptive statistics mean and standard deviation determined respondents' perceptions of self-efficacy and occupational commitment. This study results indicate significant effects of self-efficacy on occupational commitment. It is important because self-efficacy is required to upgrade teaching standards of teachers.
Turbulence compressibility reduction with helicity
Creators: name: Yang, Yan
name: Zhu, Jian-Zhou
Publisher: name: arXiv
Year: 2019
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Numerical test of isotropic turbulence compressibility reduction with helicity in a cyclic box is performed. The ratios of compressibility-relevant-mode spectra over those of kinetic energy present power laws at large wavenumbers in the dissipation range, indicating a common difference of $11/15$ in the exponents of the algebraic prefactor of the nonhelical power spectra over those of helical ones. Our results being not derived from the shapes of the spectra themselves, the implied information about the helicity effect on the complex singularities of the discretized dynamical system can still be of reasonable value for insights of the Navier-Stokes equation, although the high-order finite difference scheme used for computation may not be as accurate in dissipation range as the state-of-the-art of incompressible turbulence with pseudo-spectral method. Possible applications in controlling flows, for the purposes of, say, decreasing turbulence noise, are also discussed according to the spectral fluctuations.
description: A paragraph of further remarks on Eq. (25) is added, compared to the version published in Physics of Fluids 34, 045113 (2022)
Coauthorship and Citation Networks for Statisticians
Creators: name: Ji, Pengsheng
name: Jin, Jiashun
Publisher: name: arXiv
Year: 2014
Subjects: subject: Applications (stat.AP)
subject: Digital Libraries (cs.DL)
subject: Physics and Society (physics.soc-ph)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: 91C20, 62H30, 62P25

description: We have collected and cleaned two network data sets: Coauthorship and Citation networks for statisticians. The data sets are based on all research papers published in four of the top journals in statistics from $2003$ to the first half of $2012$. We analyze the data sets from many different perspectives, focusing on (a) centrality, (b) community structures, and (c) productivity, patterns and trends. For (a), we have identified the most prolific/collaborative/highly cited authors. We have also identified a handful of "hot" papers, suggesting "Variable Selection" as one of the "hot" areas. For (b), we have identified about $15$ meaningful communities or research groups, including large-size ones such as "Spatial Statistics", "Large-Scale Multiple Testing", "Variable Selection" as well as small-size ones such as "Dimensional Reduction", "Objective Bayes", "Quantile Regression", and "Theoretical Machine Learning". For (c), we find that over the 10-year period, both the average number of papers per author and the fraction of self citations have been decreasing, but the proportion of distant citations has been increasing. These suggest that the statistics community has become increasingly more collaborative, competitive, and globalized. Our findings shed light on research habits, trends, and topological patterns of statisticians. The data sets provide a fertile ground for future researches on or related to social networks of statisticians.
СЕЗОННОЕ РАСПРЕДЕЛЕНИЕ РАДОНА (222RN) В МНОГОКВАРТИРНЫХ ДОМАХ В НАВОИ И САМАРКАНДЕ
Creators: name: Журақулов Алишер Рустамович
name: Курбанов Бахтиѐр Ибрагимович
name: Урунов Исокул Облокулович
name: Абдурахмонов Улугбек Шавкат Угли
Publisher: name: Journal of Advances in Engineering Technology
Year: 2020
Subjects: радон
торий
радий
гамма спектр
угольный сорбент
объѐмная активность радона
полупроводниковые детекторы
radon
thorium
radium
gamma spectrum
carbon sorbent
radon volume activity
semiconductor detectors.

description: В настоящее время на планете Земле приобретаемый дозы естественного излучение почве 70% составляет радон и его соединения основным источником радона у жилых домов являются почва подземного прослойки и строительные материалы. Контроль за содержанием радона имеется только у нескольких промышленных предприятий где считают его содержание больше. Однако, во многих регионов и больших городов, а именно, где имеются многоэтажные дома, густонаселенных пунктах оно не контролируется. Настоящая статья рассматривает изменение содержание радона и его составляющие в больших городах Узбекистана Навои и Самарканд. Полученные результаты дают возможность дальнейшему исследованию и контроль за радоном и принятие меры соответствующих загрязнений.
description: Currently, on the planet Earth, the acquired dose of natural radiation in the soil is 70% radon and its compounds. the main source of radon in residential buildings is the soil of the underground layer and construction materials. Control over the content of radon is available only in a few industrial enterprises where its content is considered to be higher. However, in many regions and large cities, namely, where there are multi-storey buildings, densely populated areas, it is not controlled. This article examines the changes in radon content and its components in the large cities of Uzbekistan Navoi and Samarkand. The results obtained make it possible to further study and control radon and take appropriate measures of pollution.
Vários, Consejo Ecuménico de las Iglesias. Upsala 1968. Informes, declaraciones y alocuciones. Ed. Sígueme. Vol. de 301 ps. 115x185. Salamanca 1969
Creators: name: Correia, Francisco Carvalho
Publisher: name: Theologica
Year: 1969

description: Theologica, v. 4 n. 4 (1969)
ЎЗБЕКИСТОН ВОЛЛАСТОНИТИ ТОҒ ЖИНСИНИНГ ТАРКИБИЙ ТАҲЛИЛЛАРИ
Creators: name: Товбаев Акрам Нурмонович
name: Сафаров Зокир Носирович
name: Қодиров Халим Гафурович
name: Мардонов Даврон Шамси Ўғли
Publisher: name: Journal of Advances in Engineering Technology
Year: 2020
Subjects: Волластонит
кремний
технологик параметрлар
минералогик таркиб
минерал техноген
типификациясини
минтақалар
электротехника саноати
компонентлар
компьютер технологиялари
тоғ жинси
шилам
кимѐвий таркиб
физико-механикавий хоссалари.
Wollastonite
silicon
technological parameters
mineralogical
technogenic mineral
typification
regions
electrical industry
components
computer technology
rock
sludge
chemical
physical and mechanical.

description: Ўзбекистон волластонит тоғ жинси конлари Қўйтош, Лангар Қизилқум конларини таркибий анализи ўрганилиб лабаратория анализи келтирилган. Республика иқтисодиѐтида бугунги кунда аҳамияти қанчалик долзарб эканлиги тўғрисида маълумот берилган. Бундан ташқари волластонит тоғ жинсини кимѐвий таркибини ўрганиб, қўлланилиш соҳалари тўғрисида ҳам зарур маълумотлар келтирилган. Волластонит таркибидаги кальцийнинг бир тоннаси жаҳон бозорида 30 минг долларга баҳоланган бўлиб, таркибида 23 элементдан иборат минерал ҳисобланади. Кремний элементини бекорга ҳаѐт элементи деб айтилмайди. Сайѐрамизни 60 % ни кислород, 27% ни кремний элементи ташкил этади. Шундай экан, кислород инсон учун қанчалик аҳамиятга эга бўлса, саноат учун волластонит шунчалик аҳамиятли. Ривожланган мамлакатлар Хитой, Америка, Япония, Германия ва бошқа мамлакатларда 200 га яқин компаниялар кремний элементи билан ишлаб, маҳсулот тайѐорлаб келмоқда.
description: Structural analysis of the Koitash and Langar-Kyzylkum deposits that are Uzbekistan wollastonite rocks, is investigated and laboratory analysis is given. Information about its currently importance in the economy of the Uzbekistan Republic is demonstrated. In addition, the study of the chemical composition of wollastonite rock is carried out and the necessary information on the areas of its application is listed. One ton of calcium in wollastonite is valued on the world market at $ 30,000 and this is a mineral containing 23-elements. The element silicon is not for nothing considered an element of life. Oxygen is made out 60% of our planet and elements silicon is 27%. Therefore, wollastonite is just as important for industry as oxygen is for humanity. In developed countries, China, America, Japan, Germany and other countries, about 200 companies works on the element silicon and manufacture silicon-based products.
Improved cross-section predictions for heavy charged Higgs boson production at the LHC
Creators: name: Flechl, Martin
name: Klees, Richard
name: Kramer, Michael
name: Spira, Michael
name: Ubiali, Maria
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In most extensions of the Standard Model, heavy charged Higgs bosons at the LHC are dominantly produced in association with heavy quarks. An up-to-date determination of the next-to-leading order total cross section in a type-II two-Higgs-doublet model is presented, including a thorough estimate of the theoretical uncertainties due to missing higher-order corrections, parton distribution functions and physical input parameters. Predictions in the four- and five-flavour schemes are compared and reconciled through a recently proposed scale-setting prescription. A four- and five-flavour scheme matched prediction is provided for the interpretation of current and future experimental searches for heavy charged Higgs bosons at the LHC.
description: Sep 19 2014, 26 pp Journal version
Constraints on parton distribution functions and extraction of the strong coupling constant from the inclusive jet cross section in pp collisions at sqrt(s) = 7 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The inclusive jet cross section for proton-proton collisions at a centre-of-mass energy of 7 TeV was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0 inverse femtobarns. The measurement covers a phase space up to 2 TeV in jet transverse momentum and 2.5 in absolute jet rapidity. The statistical precision of these data leads to stringent constraints on the parton distribution functions of the proton. The data provide important input for the gluon density at high fractions of the proton momentum and for the strong coupling constant at large energy scales. Using predictions from perturbative quantum chromodynamics at next-to-leading order, complemented with electroweak corrections, the constraining power of these data is investigated and the strong coupling constant at the Z boson mass M[Z] is determined to be alpha[S(M[Z])} = 0.1185 +/- 0.0019 (exp) +0.0060 -0.0037 (theo), which is in agreement with the world average.
description: Replaced with published version. Added journal reference and DOI
Van der Waals-London interaction of atoms with pseudo-relativistic kinetic energy
Creators: name: Barbaroux, Jean-Marie
name: Hartig, Michael
name: Hundertmark, Dirk
name: Vugalter, Semjon
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider a multiatomic system where the nuclei are assumed to be point charges at fixed positions. Particles interact via Coulomb potential and electrons have pseudo-relativistic kinetic energy. We prove the van der Waals-London law, which states that the interaction energy between neutral atoms decays as the sixth power of the distance $|D|$ between the atoms. We rigorously compute all the terms in the binding energy up to the order $|D|^{-9}$ with error term of order $\mathcal{O}(|D|^{-10})$ . As intermediate steps we prove exponential decay of eigenfunctions of multiparticle Schrödinger operators with permutation symmetry imposed by the Pauli principle and new estimates of the localization error.
ХАРАКТЕРИСТИКИ ФОСФОРИТОВ И ГЛАУКОНИТОВ КАРАКАЛПАКСТАНА И СПОСОБЫ ИХ ПЕРЕРАБОТКИ
Creators: name: Худойбердиевф.И.
name: Тахирова Н.Б.
Publisher: name: Journal of Advances in Engineering Technology
Year: 2020
Subjects: глауконит
перспектива
Крантау
изменчивый
химический состав
окись калия окись натрия
окись алюминия
окись железа
закись железа
окись магни
двуокись кремния
почва
glauconitic
perspective
Krantau
changeable
chemical composition
potassium oxide
sodium oxide
aluminum oxide
iron oxide
magnesium oxide
silicon dioxide
soil

description: В настоящее время в мире по мере роста численности населения обостряется продовольственная проблема. Уделяется особое внимание эффективному использованию земельных и водных ресурсов, а также минеральных удобрений различного состава, которые являются одним из основных факторов повышения урожайности и качества сельскохозяйственных культур. В решении данной проблемы огромное значение имеет увеличение объемов производства комплексных минеральных удобрений на основе местного сырья.
description: At the present time in the world as the population grows, the food problem is aggravated. Special attention is paid to the efficient use of land and water resources, as well as mineral fertilizers of various compositions, which are one of the main factors in increasing the yield and quality of agricultural crops. In solving this problem, it is of great importance to increase the production of complex mineral fertilizers based on local raw materials.
On the electron-ion temperature ratio established by collisionless shocks
Creators: name: Vink, Jacco
name: Broersen, Sjors
name: Bykov, Andrei
name: Gabici, Stefano
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Astrophysical shocks are often collisionless shocks. An open question about collisionless shocks is whether electrons and ions each establish their own post-shock temperature, or whether they quickly equilibrate in the shock region. Here we provide simple relations for the minimal amount of equilibration to expect. The basic assumption is that the enthalpy-flux of the electrons is conserved separately, but that all particle species should undergo the same density jump across the the shock. This assumption results in an analytic treatment of electron-ion equilibration that agrees with observations of collisionless shocks: at low Mach numbers ($<2$) the electrons and ions are close to equilibration, whereas for Mach numbers above $M \sim 60$ the electron-ion temperature ratio scales with the particle masses $T_e/T_i = m_e/m_i$. In between these two extremes the electron-ion temperature ratio scales as $T_e/T_i \propto 1/M_s^2$. This relation also hold if adiabatic compression of the electrons is taken into account. For magnetised plasmas the compression is governed by the magnetosonic Mach number, whereas the electron-ion temperatures are governed by the sonic Mach number. The derived equations are in agreement with observational data at low Mach numbers, but for supernova remnants the relation requires that the inferred Mach numbers for the observations are over- estimated, perhaps as a result of upstream heating in the cosmic-ray precursor. In addition to predicting a minimal electron/ion temperature ratio, we also heuristically incorporate ion-electron heat exchange at the shock, quantified with a dimensionless parameter $ξ$. Comparing the model to existing observations in the solar system and supernova remnants suggests that the data are best described by $ξ \sim 5$ percent. (Abridged abstract.)
description: Accepted for publication in Astronomy and Astrophysics. This version is expanded with a section on adiabatic heating of the electrons and the effects of magnetic fields
Physical bounds and radiation modes for MIMO antennas
Creators: name: Ehrenborg, Casimir
name: Gustafsson, Mats
Publisher: name: arXiv
Year: 2019
Subjects: subject: Signal Processing (eess.SP)
subject: Classical Physics (physics.class-ph)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Physical sciences

description: Modern antenna design for communication systems revolves around two extremes: devices, where only a small region is dedicated to antenna design, and base stations, where design space is not shared with other components. Both imply different restrictions on what performance is realizable. In this paper properties of both ends of the spectrum in terms of MIMO performance is investigated. For electrically small antennas the size restriction dominates the performance parameters. The regions dedicated to antenna design induce currents on the rest of the device. Here a method for studying fundamental bound on spectral efficiency of such configurations is presented. This bound is also studied for $N$-degree MIMO systems. For electrically large structures the number of degrees of freedom available per unit area is investigated for different shapes. Both of these are achieved by formulating a convex optimization problem for maximum spectral efficiency in the current density on the antenna. A computationally efficient solution for this problem is formulated and investigated in relation to constraining parameters, such as size and efficiency.
Frame Based Precoding in Satellite Communications: A Multicast Approach
Creators: name: Christopoulos, Dimitrios
name: Chatzinotas, Symeon
name: Ottersten, Bjorn
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In the present work, a multibeam satellite that employs aggressive frequency reuse towards increasing the offered throughput is considered. Focusing on the forward link, the goal is to employ multi-antenna signal processing techniques, namely linear precoding, to manage the inter-beam interferences. In this context, fundamental practical limitations, namely the rigid framing structure of satellite communication standards and the on-board per-antenna power constraints, are herein considered. Therefore, the concept of optimal frame based precoding under per-antenna constraints, is discussed. This consists in precoding the transmit signals without changing the underlying framing structure of the communication standard. In the present work, the connection of the frame based precoding problem with the generic signal processing problem of conveying independent sets of common data to distinct groups of users is established. This model is known as physical layer multicasting to multiple co-channel groups. Building on recent results, the weighted fair per-antenna power constrained multigroup multicast precoders are employed for frame based precoding. The throughput performance of these solutions is compared to multicast aware heuristic precoding methods over a realistic multibeam satellite scenario. Consequently, the gains of the proposed approach are quantified via extensive numerical results.
description: Accepted for presentation at the IEEE ASMS 2014
Multichannel scattering theory for Toeplitz operators with piecewise continuous symbols
Creators: name: Sobolev, Alexander V.
name: Yafaev, Dmitri
Publisher: name: arXiv
Year: 2019
Subjects: subject: Spectral Theory (math.SP)
subject: Complex Variables (math.CV)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 47B35, Secondary 47A40

description: Self-adjoint Toeplitz operators have purely absolutely continuous spectrum. For Toeplitz operators $T$ with piecewise continuous symbols, we suggest a further spectral classification determined by propagation properties of the operator $T$, that is, by the behavior of $\exp(-iTt) f$ for $t\to\pm\infty$. It turns out that the spectrum is naturally partitioned into three disjoint subsets: thick, thin and mixed spectra. On the thick spectrum, the propagation properties are modeled by the continuous part of the symbol, whereas on the thin spectrum, the model operator is determined by the jumps of the symbol. On the mixed spectrum, these two types of the asymptotic evolution of $\exp(-iTt) f$ coexist. This classification is justified in the framework of scattering theory. We prove the existence of wave operators that relate the model operators with the Toeplitz operator $T$. The ranges of these wave operators are pairwise orthogonal, and their orthogonal sum exhausts the whole space, i.e., the set of these wave operators is asymptotically complete.
description: 34 pages
Metastability, excitations, fluctuations, and multiple-swallowtail structures of a superfluid in a Bose-Einstein condensate in the presence of a uniformly moving defect
Creators: name: Kunimi, Masaya
name: Kato, Yusuke
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We solve the Gross-Pitaevskii (GP) and Bogoliubov equations to investigate the metastability of superfluidity in a Bose-Einstein condensate in the presence of a uniformly moving defect potential in a two-dimensional torus. We calculate the total energy and momentum as functions of the driving velocity of the moving defect and find metastable states with negative effective-mass near the critical velocity. We also find that the first excited energy (energy gap) in the finite-sized torus closes at the critical velocity, that it obeys one-fourth power-law scaling, and that the dynamical fluctuation of the density (amplitude of the order parameter) is strongly enhanced near the critical velocity. We confirm the validity of our results near the critical velocity by calculating the quantum depletion. We find an unconventional swallowtail structure (multiple-swallowtail structure) through calculations of the unstable stationary solutions of the GP equation.
description: 16 pages, 20 figures
Optimal Regularity of Solutions to No-Sign Obstacle-Type Problems for the Sub-Laplacian
Creators: name: Magnani, Valentino
name: Minne, Andreas
Publisher: name: arXiv
Year: 2019
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35H20, 35R35

description: We establish the optimal $C_{H}^{1,1}$ interior regularity of solutions to \[ Δ_{H}u=fχ_{\{u\ne0\}}, \] where $Δ_{H}$ denotes the sub-Laplacian operator in a stratified group. We assume the weakest regularity condition on $f$, namely $f*Γ$ is $C_{H}^{1,1}$, where $Γ$ is the fundamental solution of $Δ_{H}$. The $C_{H}^{1,1}$ regularity is understood in the sense of Folland and Stein. In the classical Euclidean setting, the first seeds of the above problem are already present in the 1991 paper of Sakai and are also related to quadrature domains. As a special instance of our results, when $u$ is nonnegative and satisfies the above equation we recover the $C_{H}^{1,1}$ regularity of solutions to the obstacle problem in stratified groups, that was previously established by Danielli, Garofalo and Salsa. Our regularity result is sharp: it can be seen as the subelliptic counterpart of the $C^{1,1}$ regularity result due to Andersson, Lindgren and Shahgholian.
description: 30 pages
Lattice NRQCD study of S- and P-wave bottomonium states in a thermal medium with $N_f=2+1$ light flavors
Creators: name: Kim, Seyong
name: Petreczky, Peter
name: Rothkopf, Alexander
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the properties of S-and P-wave bottomonium states in the vicinity of the deconfinement transition temperature. The light degrees of freedom are represented by dynamical lattice QCD configurations of the HotQCD collaboration with $N_f = 2 + 1$ flavors. Bottomonium correlators are obtained from bottom quark propagators, computed in nonrelativistic quantum chromodynamics (NRQCD) under the background of these gauge field configurations. The spectral functions for the $^3S_1$ ($Υ$) and $^3P_1$ ($χ_{b1}$) channel are extracted from the Euclidean time correlators using a novel Bayesian approach in the temperature region $140 {\rm MeV} \le T \le 249 {\rm MeV}$ and the results are contrasted to those from the standard maximum entropy method. We find that the new Bayesian approach is far superior to the maximum entropy method. It enables us to study reliably the presence or absence of the lowest state signal in the spectral function of a certain channel, even under the limitations present in the finite temperature setup. We find that $χ_{b1}$ survives up to $T=249 {\rm MeV}$, the highest temperature considered in our study and put stringent constraints on the size of the medium modification of $Υ$ and $χ_{b1}$ states.
description: 30 pages, 76 figures
Manajemen Penilaian Akreditasi Jurnal Terupdate
Creators: name: Ayatullah, M. Ibraar
Publisher: name: Zenodo
Year: 2022
Subjects: ARJUNA
Akreditasi Jurnal
SINTA

description: Kegiatan ini merupakan kegiatan Webinar Ngobras (Ngobrol Santai Tentang Jurnal) yang diselenggarakan oleh Je-Kail (Jejaring Berkala Ilmiah Poltekkes Kementerian Kesehatan Republik Indonesia.
Matczak, Sebastian A., Le problème de Dieu dans la pensée de Karl Barth. Ed. Nauwelaerts de Louvain e Béatrice-Nauwelaerts de Paris. Vol. de XXVIII+272 ps. 165x250. Louvain-Paris 1968
Creators: name: Correia, Francisco Carvalho
Publisher: name: Theologica
Year: 1969

description: Theologica, v. 4 n. 4 (1969)
Time optimal observability for Grushin Schrödinger equation
Creators: name: Burq, Nicolas
name: Sun, Chenmin
Publisher: name: arXiv
Year: 2019
Subjects: subject: Analysis of PDEs (math.AP)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We consider two dimensional Grushin Schrödinger equation posed on a finite cylinder $Ω=(-1,1)_x\times \T_y$ with Dirichlet boundary condition. We obtain the sharp observability by any horizontal strip, with the optimal time $T_*>0$ depending on the size of the strip. Consequently, we prove the exact controllability for Grushin Schrödinger equation. By exploiting the concentration of eigenfunctions of harmonic oscillator at $x=0$, we also show that the observability fails for any $T\leq T_*$.
description: 47 pages, 3 figures
A unified treatment for non-asymptotic and asymptotic approaches to minimax signal detection
Creators: name: Marteau, Clement
name: Sapatinas, Theofanis
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We are concerned with minimax signal detection. In this setting, we discuss non-asymptotic and asymptotic approaches through a unified treatment. In particular, we consider a Gaussian sequence model that contains classical models as special cases, such as, direct, well-posed inverse and ill-posed inverse problems. Working with certain ellipsoids in the space of squared-summable sequences of real numbers, with a ball of positive radius removed, we compare the construction of lower and upper bounds for the minimax separation radius (non-asymptotic approach) and the minimax separation rate (asymptotic approach) that have been proposed in the literature. Some additional contributions, bringing into light links between non-asymptotic and asymptotic approaches to minimax signal, are also presented. An example of a mildly ill-posed inverse problem is used for illustrative purposes. In particular, it is shown that tools used to derive `asymptotic' results can be exploited to draw `non-asymptotic' conclusions, and vice-versa.
description: 37 pages, 4 Figures
title: Stored Grain Protection: cases studies in Portugal
Creators: name: Carvalho, Maria Otilia
name: Cambeiro, Ana Filipa
name: Fradinho, Patricia
name: Magro, Ana
name: Teixeira, Bárbara
name: Mendes, Rogério
name: Mourato, Miguel Pedro
Publisher: name: Julius-Kühn-Institut
Year: 2018

description: Considering the edibility of insects’ species associated with storage ecosystem, chemical control methods can be easily replaced by environmental and economically sustainable alternatives.
Use of biogenerated atmospheres is an inexpensive method that tolerates insect presence. In Portugal, during one year, hermetic bags were used to store paddy under 65-75-85% relative humidity (RH) and 14-17-24ºC temperatures. Brown rice infested with Sitophilus zeamais adults was placed inside the hermetic bags.
Biogenerated atmosphere was naturally produced inside the hermetic bag, at 85% RH, with low O2 and high CO2 contents, showing that S. zeamais can survive but has no progeny at 14º-17ºC, or attained 100% mortality before producing progeny at 24ºC. The most abundant fungi isolated were Alternaria alternata and Epicoccum nigrum. The results showed the importance of the RH on changes in atmospheric gas content of paddy, due to biological agents’ activity.
Analysing the edibility of insects species associated with stored grain, preliminary studies were carried out to evaluate the nutritional value of immatures stages of Tribolium castaneum. Larvae of T. castaneum had a content of 21.4% protein, 9.1% lipids, 8.8% fiber, and a relevant content of eight essential amino acids and also manganese and copper. The edibility of insects must be consider given their high nutritional value, low emissions of Green House Gases (GHGs), low requirements for land, and by reducing and mitigating the need for chemical control.
description: Julius-Kühn-Archiv, Nr. 463, Vol.1 (2018): Proceedings of the 12th International Working Conference on Stored Product Protection (IWCSPP) in Berlin, Germany, October 7-11, 2018
title: Δημιουργία Εταιρικής Ταυτότητας Πραγματικής Επιχείρησης
title: Branding for an existing business
titleType: AlternativeTitle
Creators: name: Κουκουνάρα, Ευαγγελία Μαρία
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2022
Subjects: Branding

description: Βασικός στόχος της παρούσας πτυχιακής, είναι η δημιουργία της ανύπαρκτης εταιρικής ενός εστιατορίου στη Ζάκυνθο. Στο παρών αρχείο περιέχονται μόνο τα έντυπα στοιχεία της εργασίας.
Using Activated Transport in Parallel Nanowires for Energy Harvesting and Hot Spot Cooling
Creators: name: Bosisio, Riccardo
name: Gorini, Cosimo
name: Fleury, Geneviève
name: Pichard, Jean-Louis
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study arrays of parallel doped semiconductor nanowires in a temperature range where the electrons propagate through the nanowires by phonon assisted hops between localized states. By solving the Random Resistor Network problem, we compute the thermopower $S$, the electrical conductance $G$, and the electronic thermal conductance $K^e$ of the device. We investigate how those quantities depend on the position -- which can be tuned with a back gate -- of the nanowire impurity band with respect to the equilibrium electrochemical potential. We show that large power factors can be reached near the band edges, when $S$ self-averages to large values while $G$ is small but scales with the number of wires. Calculating the amount of heat exchanged locally between the electrons inside the nanowires and the phonons of the environment, we show that phonons are mainly absorbed near one electrode and emitted near the other when a charge current is driven through the nanowires near their band edges. This phenomenon could be exploited for a field control of the heat exchange between the phonons and the electrons at submicron scales in electronic circuits. It could be also used for cooling hot spots.
description: 12 pages, 8 figures, 4 appendices
title: Εφαρμογή κινουμένου σχεδίου σε βιντεοπαιχνίδι με τίτλο “Bingo versus the Dogs”
title: Animation in Video Game, Proof of concept titled: “Bingo versus the Dogs”
titleType: AlternativeTitle
Creators: name: Τσαφαρίδη, Αικατερίνη
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2022
Subjects: Animation
Κινούμενο σχέδιο
Video Game
Βιντεοπαιχνίδι
Character creation
Platformer

description: Με την πτυχιακή μου δημιούργησα ένα απλό λειτουργικό βιντεοπαιχνίδι τύπου platformer στο οποίο συνδύασα τα εξής: ➡ Κινούμενο σχέδιο ➡ Σχεδιασμός χαρακτήρων ➡ Κώδικας & Προγραμματισμός ➡ Διαφημιστικό υλικό & Τοποθέτηση προϊόντος.
On the projective description of spaces of ultradifferentiable functions of Roumieu type
Creators: name: Debrouwere, Andreas
name: Prangoski, Bojan
name: Vindas, Jasson
Publisher: name: arXiv
Year: 2019
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46E10, 46F05

description: We provide a projective description of the space $\mathcal{E}^{\{\mathfrak{M}\}}(Ω)$ of ultradifferentiable functions of Roumieu type, where $Ω$ is an arbitrary open set in $\mathbb{R}^d$ and $\mathfrak{M}$ is a weight matrix satisfying the analogue of Komatsu's condition $(M.2)'$. In particular, we obtain in a unified way projective descriptions of ultradifferentiable classes defined via a single weight sequence (Denjoy-Carleman approach) and via a weight function (Braun-Meise-Taylor approach) under considerably weaker assumptions than in earlier versions of these results.
description: 8 pages
Optimal rate of condensation for trapped bosons in the Gross-Pitaevskii regime
Creators: name: Nam, Phan Thành
name: Napiórkowski, Marcin
name: Ricaud, Julien
name: Triay, Arnaud
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study the Bose-Einstein condensates of trapped Bose gases in the Gross-Pitaevskii regime. We show that the ground state energy and ground states of the many-body quantum system are correctly described by the Gross-Pitaevskii equation in the large particle number limit, and provide the optimal convergence rate. Our work extends the previous results of Lieb, Seiringer and Yngvason on the leading order convergence, and of Boccato, Brennecke, Cenatiempo and Schlein on the homogeneous gas. Our method relies on the idea of 'completing the square', inspired by recent works of Brietzke, Fournais and Solovej on the Lee-Huang-Yang formula, and a general estimate for Bogoliubov quadratic Hamiltonians on Fock space.
description: Final version to appear in Analysis & PDE
Multiscale unique continuation properties of eigenfunctions
Creators: name: Borisov, Denis
name: Nakić, Ivica
name: Rose, Christian
name: Tautenhahn, Martin
name: Veselić, Ivan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: Quantitative unique continuation principles for multiscale structures are an important ingredient in a number applications, e.g. random Schrödinger operators and control theory. We review recent results and announce new ones regarding quantitative unique continuation principles for partial differential equations with an underlying multiscale structure. They concern Schrödinger and second order elliptic operators. An important feature is that the estimates are scale free and with quantitative dependence on parameters. These unique continuation principles apply to functions satisfying certain `rigidity' conditions, namely that they are solutions of the corresponding elliptic equations, or projections on spectral subspaces. Carleman estimates play an important role in the proofs of these results. We also present an explicit Carleman estimate for second order elliptic operators.
Semantic Security for Quantum Wiretap Channels
Creators: name: Boche, Holger
name: Cai, Minglai
name: Deppe, Christian
name: Ferrara, Roberto
name: Wiese, Moritz
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We consider the problem of semantic security via classical-quantum and quantum wiretap channels and use explicit constructions to transform a non-secure code into a semantically secure code, achieving capacity by means of biregular irreducible functions. Explicit parameters in finite regimes can be extracted from theorems. We also generalize the semantic security capacity theorem, which shows that a strongly secure code guarantees a semantically secure code with the same secrecy rate, to any quantum channel, including the infinite-dimensional and non-Gaussian ones.
description: v2: published version; v1: 38 pages, 2 figures
Solution of nonlinear Stokes equations discretized by high-order finite elements on nonconforming and anisotropic meshes, with application to ice sheet dynamics
Creators: name: Isaac, Tobin
name: Stadler, Georg
name: Ghattas, Omar
Publisher: name: arXiv
Year: 2014
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Motivated by the need for efficient and accurate simulation of the dynamics of the polar ice sheets, we design high-order finite element discretizations and scalable solvers for the solution of nonlinear incompressible Stokes equations. We focus on power-law, shear thinning rheologies used in modeling ice dynamics and other geophysical flows. We use nonconforming hexahedral meshes and the conforming inf-sup stable finite element velocity-pressure pairings $\mathbb{Q}_k\times \mathbb{Q}^\text{disc}_{k-2}$ or $\mathbb{Q}_k \times \mathbb{P}^\text{disc}_{k-1}$. To solve the nonlinear equations, we propose a Newton-Krylov method with a block upper triangular preconditioner for the linearized Stokes systems. The diagonal blocks of this preconditioner are sparse approximations of the (1,1)-block and of its Schur complement. The (1,1)-block is approximated using linear finite elements based on the nodes of the high-order discretization, and the application of its inverse is approximated using algebraic multigrid with an incomplete factorization smoother. This preconditioner is designed to be efficient on anisotropic meshes, which are necessary to match the high aspect ratio domains typical for ice sheets. We develop and make available extensions to two libraries---a hybrid meshing scheme for the p4est parallel AMR library, and a modified smoothed aggregation scheme for PETSc---to improve their support for solving PDEs in high aspect ratio domains. In a numerical study, we find that our solver yields fast convergence that is independent of the element aspect ratio, the occurrence of nonconforming interfaces, and of mesh refinement, and that depends only weakly on the polynomial finite element order. We simulate the ice flow in a realistic description of the Antarctic ice sheet derived from field data, and study the parallel scalability of our solver for problems with up to 383M unknowns.
description: 31 pages
Convex cones in mapping spaces between matrix algebras
Creators: name: Girard, Mark
name: Kye, Seung-Hyeok
name: Størmer, Erling
Publisher: name: arXiv
Year: 2020
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 15A30, 81P15, 46L05, 46L07

description: We introduce the notion of one-sided mapping cones of positive linear maps between matrix algebras. These are convex cones of maps that are invariant under compositions by completely positive maps from either the left or right side. The duals of such convex cones can be characterized in terms of ampliation maps, which can also be used to characterize many notions from quantum information theory---such as separability, entanglement-breaking maps, Schmidt numbers, as well as decomposable maps and $k$-positive maps in functional analysis. In fact, such characterizations hold if and only if the involved cone is a one-sided mapping cone. Through this analysis, we obtain mapping properties for compositions of cones from which we also obtain several equivalent statements of the PPT (positive partial transpose) square conjecture.
description: An earlier version of this paper due to second and third authors originally appeared as arXiv:2002.09614v1. After the first author joined as a co-author, the authors changed the title, rewrote and extended the results of the earlier version
Note on vector valued Hardy spaces related to analytic functions having distributional boundary values
Creators: name: Carmichael, Richard D.
name: Pilipović, Stevan
name: Vindas, Jasson
Publisher: name: arXiv
Year: 2020
Subjects: subject: Complex Variables (math.CV)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 32A07, 32A35, 46F20, 32A26

description: Analytic functions defined on a tube domain $T^{C}\subset \mathbb{C}^{n}$ and taking values in a Banach space $X$ which are known to have $X$-valued distributional boundary values are shown to be in the Hardy space $H^{p}(T^{C},X)$ if the boundary value is in the vector valued Lebesgue space $L^{p}(\mathbb{R}^{n},X)$, where $1\leq p \leq \infty$ and $C$ is a regular open convex cone. Poisson integral transform representations of elements of $H^{p}(T^{C}, X)$ are also obtained for certain classes of Banach spaces, including reflexive Banach spaces.
description: 5 pages