cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Are Causality Violations Undesirable?
Creators: name: Monroe, Hunter
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Algebraic Topology (math.AT)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Causality violations are typically seen as unrealistic and undesirable features of a physical model. The following points out three reasons why causality violations, which Bonnor and Steadman identified even in solutions to the Einstein equation referring to ordinary laboratory situations, are not necessarily undesirable. First, a space-time in which every causal curve can be extended into a closed causal curve is singularity free--a necessary property of a globally applicable physical theory. Second, a causality-violating space-time exhibits a nontrivial topology--no closed timelike curve (CTC) can be homotopic among CTCs to a point, or that point would not be causally well behaved--and nontrivial topology has been explored as a model of particles. Finally, if every causal curve in a given space-time passes through an event horizon, a property which can be called "causal censorship", then that space-time with event horizons excised would still be causally well behaved.
description: Accepted in October 2008 by Foundations of Physics. Latex2e, 6 pages, no figures. Presented at a seminar at the Universidad Nacional Autonoma de Mexico. Version 2 was co-winner of the QMUL CTC Essay Prize
The ThreeHundred: the structure and properties of cosmic filaments in the outskirts of galaxy clusters
Creators: name: Rost, Agustín
name: Kuchner, Ulrike
name: Welker, Charlotte
name: Pearce, Frazer
name: Stasyszyn, Federico
name: Gray, Meghan
name: Cui, Weiguang
name: Dave, Romeel
name: Knebe, Alexander
name: Yepes, Gustavo
name: Rasia, Elena
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galaxy cluster outskirts are described by complex velocity fields induced by diffuse material collapsing towards filaments, gas and galaxies falling into clusters, and gas shock processes triggered by substructures. A simple scenario that describes the large-scale tidal fields of the cosmic web is not able to fully account for this variety, nor for the differences between gas and collisionless dark matter. We have studied the filamentary structure in zoom-in resimulations centred on 324 clusters from The ThreeHundred project, focusing on differences between dark and baryonic matter. This paper describes the properties of filaments around clusters out to five $R_{200}$, based on the diffuse filament medium where haloes had been removed. For this, we stack the remaining particles of all simulated volumes to calculate the average profiles of dark matter and gas filaments. We find that filaments increase their thickness closer to nodes and detect signatures of gas turbulence at a distance of $\sim 2 h^{-1}\rm{Mpc}$ from the cluster. These are absent in dark matter. Both gas and dark matter collapse towards filament spines at a rate of $\sim 200 h^{-1} \rm{km ~ s^{-1}} $. We see that gas preferentially enters the cluster as part of filaments, and leaves the cluster centre outside filaments. We further see evidence for an accretion shock just outside the cluster. For dark matter, this preference is less obvious. We argue that this difference is related to the turbulent environment. This indicates that filaments act as highways to fuel the inner regions of clusters with gas and galaxies.
description: 14 pages, 12 figures, accepted for publication in MNRAS
Spectral Geometry and Asymptotically Conic Convergence
Creators: name: Rowlett, J. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Spectral Theory (math.SP)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58J50, 58J35

description: In this paper we define a new convergence called "asymptotically conic convergence" in which a smooth family of Riemannian metrics on a fixed compact manifold degenerate to a metric with isolated conic singularity. Our results are: convergence of the spectrum of the geometric Laplacians and uniform convergence of the corresponding heat kernels and existence of a full asymptotic expansion with uniform convergence for all time. Techniques include: the resolution of a conic singularity using a new "resolution blowup" and microlocal analysis using pseudodifferential operator calculi on manifolds with corners constructed by various (standard and non-standard) blowups.
(Gaugino condensation and) small uplifts in KKLT
Creators: name: Moritz, Jakob
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019

description: Stringpheno, Geneva, Switzerland, 24 Jun 2019 - 28 Jun 2019
description: We argue that ten-dimensional consistency requirements in the form of a certain tadpole cancellation condition can be satisfied by KKLT type vacua of type IIB string theory. The stress caused by the restoring force that the stabilization mechanism exerts on the volume modulus once supersymmetry gets broken can be seen to ensure this dynamically. However, we also explain that it is surprisingly difficult to engineer sufficiently long warped throats to prevent decompactification which are also small enough in size to fit into the bulk Calabi-Yau (CY). We give arguments that achieving this with reasonable amount of control may not be possible in generic CY compactifications while CYs with very non-generic geometrical properties might evade this conclusion.
Slow thermo-optomechanical pulsations in suspended 1D photonic crystal nanocavities
Creators: name: Fonseca, Piergiacomo Z. G.
name: Alda, Irene
name: Marino, Francesco
name: Cuadrado, Alexander
name: d'Ambrosio, Vincenzo
name: Gieseler, Jan
name: Quidant, Romain
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We investigate the nonlinear optical response of suspended 1D photonic crystal nanocavities fabricated on a silicon nitride chip. Strong thermo-optical nonlinearities are demonstrated for input powers as low as $2\,μ\text{W}$ and a self-sustained pulsing regime is shown to emerge with periodicity of several seconds. As the input power and laser wavelength are varied the temporal patterns change in period, duty cycle and shape. This dynamics is attributed to the multiple timescale competition between thermo-optical and thermo-optomechanical effects and closely resembles the relaxation oscillations states found in mathematical models of neuronal activity. We introduce a simplified model that reproduces all the experimental observations and allows us to explain them in terms of the properties of a 1D critical manifold which governs the slow evolution of the system.
description: 9 pages, 6 figures
Some coordination problems
Creators: name: François, Patrick
Publisher: name: University of British Columbia
Year: 2009

description: The chapters in this thesis are each concerned with problems of coordination. The coordination issues examined here each arise in distinct situations and imply the need for a different modeling approach in each case. The first case, Chapter 2, considers gender discrimination in contemporary, competitive labour markets. It is sh9wn there that such discrimination can arise as an outcome of maximizing activities on the part of firms facing the problem of worker motivation in the light of imperfect monitorability. This is shown to lead to firms’ hiring practices (in particular discrimination) depending on the practices of other firms and consequently to labour market equilibria of discrimination and of non discrimination. It is shown that a policy of affirmative action can be useful in moving the labour market away from the discrimination equilibrium. The next chapter, Chapter 3, considers an avenue by which the structure of industries in an economy can affect the development of new technologies through its general equilibrium impact on profits relative to wages. It shows that a monopolistic structure in one industry, by increasing the share of profits in aggregate income, tends to increase the relative profitability of innovative activities elsewhere thereby leading to the creation of further monopoly rents which, in turn, feeds back into incentives for innovation thus causing a self-perpetuating cycle. This leads to the possibility of an economy exhibiting multiple steady states including a “Poverty trap” or situation of zero growth. The conditions under which multiple steady states exist are analyzed and the economy’s behaviour out of the steady state is also characterized. The role of government intervention, in the form of subsidies, direct provision of research and patent protection is also examined. Finally it is shown that the model can also explain the existence of clustering of innovations and consequent sporadic growth. The final substantive chapter, Chapter 4, centres on problems of investment coordination in the context of LDCs. These arise when the fall in the price of one good raises the demand for complementary goods, thereby implying that investment decisions leading to such price falls may not be privately undertaken whereas, when coordinated across sectors, such investments could be profitable. This chapter shows that the existence of multiple equilibria hinges upon the more restrictive Definition of complementarity between goods, namely, the Hicks definition. As a result, gross complementarity between goods (on its own), even though causing horizontal externalities, can not lead to the existence of multiple equilibria. A later section looks at gross complements in the presence of knowledge spillovers and shows, in contrast, that this can lead to multiple equilibria and coordination problems. The chapter also examines the social optimality of coordination in the Hicks complements case, showing that it is not always implied by the multiplicity of equilbria.
"Non-strict" l'Hospital-Type Rules for Monotonicity: Intervals of Constancy
Creators: name: Pinelis, Iosif
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 26A48, 26D10

description: Assuming that a "derivative" ratio rho:=f'/g' of the ratio r:=f/g of differentiable functions f and g is strictly monotonic (that is, rho is increasing or decreasing), it was shown in previous papers that then r can switch at most once, from decrease to increase or vice versa. In the present paper, it is shown that, if rho is non-strictly monotonic (that is, non-increasing or non-decreasing), then r can have at most one maximal interval of constancy (m.i.c.); on the other hand, any one m.i.c. of a given derivative ratio rho is the m.i.c. of an appropriately constructed original ratio r.
description: 5 pages
Adaptive Synchronization of Heterogeneous Multi-Agent Systems: A Free Observer Approach
Creators: name: Arevalo-Castiblanco, Miguel F.
name: Tellez-Castro, Duvan A.
name: Sofrony, Jorge
name: Mojica-Nava, Eduardo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Adaptive synchronization protocols for heterogeneous multi-agent network are investigated. The interaction between each of the agents is carried out through a directed graph. We highlight the lack of communication between agents and the presence of uncertainties in each system among the conventional problems that can arise in cooperative networks. Two methodologies are presented to deal with the uncertainties: A strategy based on robust optimal control and a strategy based on neural networks. Likewise, an input estimation methodology is designed to face the disconnection that any agent may present on the network. These control laws can guarantee synchronization between agents even when there are disturbances or no communication from any agent. Stability and boundary analyzes are performed. Cooperative cruise control simulation results are shown to validate the performance of the proposed control methods.
description: 24 pages, 5 figures, Control & systems letters
The conductance of the gated Aharonov - Bohm ring touching a quantum wire
Creators: name: Shelykh, I. A.
name: Galkin, N. G.
name: Bagraev, N. T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We analyse the conductance of the Aharonov-Bohm one-dimensional quantum ring touching a quantum wire. It is shown that in accordance with experimental data the period of the AB oscillations strongly depends on the chemical potential and the Rashba coupling parameter. The dependence of the conductance on the carrier's energy is shown to reveal the Fano resonances.
description: 12 pages, 6 figures
Eigenvectors of open Bazhanov-Stroganov quantum chain
Creators: name: Iorgov, Nikolai
Publisher: name: arXiv
Year: 2006
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this contribution we give an explicit formula for the eigenvectors of Hamiltonians of open Bazhanov-Stroganov quantum chain. The Hamiltonians of this quantum chain is defined by the generation polynomial $A_n(λ)$ which is upper-left matrix element of monodromy matrix built from the cyclic $L$-operators. The formulas for the eigenvectors are derived using iterative procedure by Kharchev and Lebedev and given in terms of $w_p(s)$-function which is a root of unity analogue of $Γ_q$-function.
description: Published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Συγκριτική αξιολόγηση ειδών αντιστήριξης επιχώσεων σε έργα οδοποιίας.:
Creators: name: Σπύρου, Δημήτρης Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Αξιολόγηση
Αντιστήριξη
Οδοποιΐα
Evaluation
Retaining
Road

description: Η παρούσα εργασία ασχολείται με τη συγκριτική αξιολόγηση τριων διαφορετικών ειδών αντιστήριξης επιχώσεων που χρησιμοποιούνται ευρέως σε έργα οδοποιίας. Τα τρία διαφορετικά αυτά είδη είναι οι τοίχοι από οπλισμένο σκυρόδεμα, οι τοίχοι οπλισμένης γης και οι οπλισμένες επιχώσεις με επενδύσεις παρειάς (facing). Στο πλαίσιο της αξιολόγησης περιγράφονται τα κύρια χαρακτηριστικά του κάθε είδους αντιστήριξης, οι συνθήκες εφαρμογής τους και τα σημαντικότερα πλεονεκτήματα και μειονεκτήματα τους. Συγκεντρώνονται σε πίνακα διάφορες περιπτώσεις κατασκευής τους κατά μήκος της Εγνατίας οδού και δίνονται τα βασικά τους στοιχεία, όπως προέρχονται από τις αντίστοιχες εγκεκριμένες μελέτες τους, τα οποία επιτρέπουν τον υπολογισμό του κόστους ανάλογα με το ύψος της αντιστηριζόμενης επίχωσης. Με βάση τα παραπάνω, προκύπτουν διαγράμματα κοστολόγησης για κάθε είδος αντιστήριξης τα οποία αποτελούν χρήσιμα εργαλεία όταν απαιτείται, κατά το προ μελέτης και δημοπράτησης στάδιο, εκτίμηση του κόστους του έργου. Εξάγονται δε συμπεράσματα για την οικονομικότερη επιλογή είδους αντιστήριξης επίχωσης σε σχέση με το ύψος της.
description: The present study deals with the comparative evaluation of three different types of retaining embankments, which are being used widely in road construction. The three different types are walls made of reinforced concrete, reinforced earth walls and reinforced embankments with investments buccal (facing). In the evaluation method, main characteristics of each type are described, the conditions for their implementation and the major advantages and disadvantages. All several constructions along the Via Egnatia are gathered in a table, which includes all the key elements, as derived from their approved studies, which allow the calculation of the cost depending on the amount of backfill height. On this basis, we come up with cost charts for each type of retaining embankment which are useful tools when we need to estimate a projects cost, during the pre design and auction stage. Finally conclusions are extracted on the most economical option type of retaining embankment relative to its height.
General solution of equations of motion for a classical particle in 9-dimensional Finslerian space
Creators: name: Solov'yov, Anton V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A Lagrangian description of a classical particle in a 9-dimensional flat Finslerian space with a cubic metric function is constructed. The general solution of equations of motion for such a particle is obtained. The Galilean law of inertia for the Finslerian space is confirmed.
description: 10 pages, LaTeX-2e, no figures; added 2 references
PROJECT WORK WITH STUDENTS IN ENVIRONMENTAL PROTECTION CLASSES
Creators: name: Safarova, Dilobar
Publisher: name: Zenodo
Year: 2024

description: Work on creating a biodiversity map of the local area. Identify and document plant and animal species, noting any invasive species that may pose a threat to the local ecosystem. Encourage creativity by organizing workshops on upcycling and creating eco-friendly crafts using recycled materials. Showcase the finished products in an exhibition to raise awareness about the importance of repurposing materials. Conduct an energy audit within the school or community to identify areas for improvement.Implement energy-saving measures and educate others on how to reduce energy consumption.
A clustering approach for pairwise comparison matrices
Creators: name: Ágoston, Kolos Csaba
name: Bozóki, Sándor
name: Csató, László
Publisher: name: arXiv
Year: 2024
Subjects: subject: Optimization and Control (math.OC)
subject: Applications (stat.AP)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 90-10, 90B50, 91B08

description: We consider clustering in group decision making where the opinions are given by pairwise comparison matrices. In particular, the k-medoids model is suggested to classify the matrices since it has a linear programming problem formulation that may contain any condition on the properties of the cluster centres. Its objective function depends on the measure of dissimilarity between the matrices but not on the weights derived from them. Our methodology provides a convenient tool for decision support, for instance, it can be used to quantify the reliability of the aggregation. The proposed theoretical framework is applied to a large-scale experimental dataset, on which it is able to automatically detect some mistakes made by the decision-makers, as well as to identify a common source of inconsistency.
description: 21 pages, 6 figures, 4 tables
Essays in policy analysis and strategy: entrepreneurship, joint venturing, and trade
Creators: name: Arend, Richard James
Publisher: name: University of British Columbia
Year: 2009

description: Separate essays on entrepreneurship, joint venturing, and trade comprise this thesis. The emergence of entrepreneurship is common in the real world but relatively less so in classical economic models. If industry incumbents are attributed with full rationality and perfect foresight, then there are few, if any, profitable opportunities left for new entrants (entrepreneurs) to exploit. This essay explains how entrepreneurs can emerge in a dynamic world when firms must choose between a technology strategy that is either statically or dynamically efficient. A model is developed which shows how such opportunities for new entry can occur when incumbents are caught in a Prisoners’ Dilemma game involving technology strategy. A relevance measure and policy implications are then explored. Joint ventures, especially of the R&D type, are becoming increasingly important as a way to gain needed technological and market competencies. Unfortunately, many joint ventures have the characteristics of a Prisoners’ Dilemma. Firms may cooperate or defect in the venture. If contracts, side-payments, and third-party verification of the venture outcome are unavailable, then the dominant solution to the Prisoners’ Dilemma (mutual defection) results. This paper proposes the use of an ex-ante auction to obtain a Pareto-improvement for these ventures. A Pareto-improvement is assured when non-transferable costs and benefits of firms are not conditional on joint venture strategies. When this condition is not met restrictions are required to obtain the Pareto-improvement. The problem of trade between countries that share an international open access resource is becoming significant as the world reaches the limits of critical shared resource stocks. It is modelled as a world with one primary factor, two intermediate goods, one final good (harvested from the open access resource), and two nations where it is assumed that either the trading takes place over one stage (nations are price-takers), or two stages (nations have market power). Imperfect competition and open access generated externalities affect the trading efficiency. To maximize world welfare this essay recommends subsidizing R&D where comparative advantage exists, and creating international agreements to ensure the one-stage game structure is used when trading.
Magnetic quantum oscillations in doped antiferromagnetic insulators
Creators: name: Kabanov, V. V.
name: Alexandrov, A. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Energy spectrum of electrons (holes) doped into a two-dimensional antiferromagnetic insulator is quantized in an external magnetic field of arbitrary direction. A peculiar dependence of de Haas-van Alphen (dHvA) or Shubnikov-de Haas (SdH) magneto-oscillation amplitudes on the azimuthal in-plane angle from the magnetization direction and on the polar angle from the out-of-plane direction is found, which can be used as a sensitive probe of the antiferromagnetic order in doped Mott-Hubbard, spin-density wave (SDW), and conventional band-structure insulators.
description: 4 pages 4 figures
ПОМЕЩЕНИЕ ТОВАРОВ ПОД ТАМОЖЕННУЮ ПРОЦЕДУРУ ТАМОЖЕННОГО СКЛАДА
Creators: name: МАТВЕЕВА НАТАЛЬЯ ВАСИЛЬЕВНА
Publisher: name: Финансовые рынки и банки
Year: 2021
Subjects: ТАМОЖЕННЫЙ СКЛАД
ТАМОЖЕННАЯ ПРОЦЕДУРА
ИНОСТРАННЫЕ ТОВАРЫ
ТАМОЖЕННЫЕ ОПЕРАЦИИ
МАРКИРОВКА ТОВАРОВ
CUSTOMS WAREHOUSE
CUSTOMS PROCEDURE
FOREIGN GOODS
CUSTOMS OPERATIONS
MARKING OF GOODS

description: Статья посвящена рассмотрению особенностей помещения иностранных товаров под таможенную процедуру таможенного склада, которая позволяет участникам внешнеэкономической деятельности не только хранить товары, помещенные под нее, на территории таможенного склада в течение трех лет, но и совершать в отношении их операции, в том числе по подготовке к продаже, включая маркировку. В России особенно актуальным стало помещение под данную процедуру иностранных товаров, на которые требуется нанесение обязательной маркировки средствами идентификации для последующего выпуска их в оборот. В статье рассмотрены условия помещения и условия использования товаров по процедуре таможенного склада, а также приведен перечень товаров, к которым не допускается ее применение. Согласно требований процедуры товары хранятся на таможенных складах открытого или закрытого типа и находятся под таможенным контролем до ее завершения. Владелец таможенного склада ведет учет товаров и ежеквартально представляет в таможенный орган отчетность.
Computational and Analytical Modeling of Cationic Lipid-DNA Complexes
Creators: name: Farago, Oded
name: Grønbech-Jensen, Niels
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a theoretical study of the physical properties of cationic lipid-DNA (CL-DNA) complexes - a promising synthetically based nonviral carrier of DNA for gene therapy. The study is based on a coarse-grained molecular model, which is used in Monte Carlo (MC) simulations of mesoscopically large systems over time scales long enough to address experimental reality. In the present work we focus on the statistical-mechanical behavior of lamellar complexes, which in MC simulations self-assemble spontaneously from a disordered random initial state.
A Novel Challenge Set for Hebrew Morphological Disambiguation and Diacritics Restoration
Creators: name: Shmidman, Avi
name: Guedalia, Joshua
name: Shmidman, Shaltiel
name: Koppel, Moshe
name: Tsarfaty, Reut
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: One of the primary tasks of morphological parsers is the disambiguation of homographs. Particularly difficult are cases of unbalanced ambiguity, where one of the possible analyses is far more frequent than the others. In such cases, there may not exist sufficient examples of the minority analyses in order to properly evaluate performance, nor to train effective classifiers. In this paper we address the issue of unbalanced morphological ambiguities in Hebrew. We offer a challenge set for Hebrew homographs -- the first of its kind -- containing substantial attestation of each analysis of 21 Hebrew homographs. We show that the current SOTA of Hebrew disambiguation performs poorly on cases of unbalanced ambiguity. Leveraging our new dataset, we achieve a new state-of-the-art for all 21 words, improving the overall average F1 score from 0.67 to 0.95. Our resulting annotated datasets are made publicly available for further research.
АКТУАЛЬНЫЙ ПОДХОД К УПРАВЛЕНИЮ ПОРТФЕЛЕМ ЦЕННЫХ БУМАГ В УСЛОВИЯХ КРИЗИСА
Creators: name: ВИСАМ АЛЬ СААДИ
Publisher: name: Финансовые рынки и банки
Year: 2021
Subjects: АКТИВ БЕЗОПАСНАЯ ГАВАНЬ
ХЕДЖ-АКТИВ
АКТИВ ДИВЕРСИФИКАТОРА
КОРРЕЛЯЦИЯ МЕЖДУ АКЦИИ
ОБЛИГАЦИИ И ЗОЛОТО
ЭФФЕКТИВНОСТЬ СЛАБОЙ ФОРМЫ
ФИНАНСОВЫЙ КРИЗИС
ЭКОНОМИЧЕСКАЯ РЕЦЕССИЯ ПОСЛЕ КОРОНАВИРУСА
ТЕОРИЯ ПЕРСПЕКТИВ
SAFE HAVEN ASSET
HEDGE ASSET
DIVERSIFIER ASSET
STOCK
BOND AND GOLD CORRELATION
WEAK FORM EFFICIENCY
FINANCIAL CRISIS
ECONOMIC RECESSION AFTER CORONAVIRUS
PROSPECT THEORY

description: Актуальный подход к управлению портфелем ценных бумаг в условиях кризиса рассматривается в контексте включения в портфель тех финансовых активов, которые в условиях кризиса становятся хеджевой составляющей портфеля, имея отрицательную корреляцию с акциями или облигациями. Анализ 2020 года показал, что такими инструментами являются золото, акции IT-компаний, обеспечивающих технологию удаленной работы, компаний по производству алкогольной продукции и т.д. В статье представлены результаты тестирования Коррляции между акциями, облигациями и золотом с целью исследования эффективности и временного горизонта хеджирования. Изучается вопрос о правомерности отнесения таких активов к категории «безопасная гавань». Поскольку отрицательно коррелированных активов немного, то повышенный спрос быстро приводит к их переоценке. Эмпирический анализ исследует доходность российских акций и облигаций и их взаимосвязь с доходностью золота в стабильный экономический период и во время пандемии коронавируса.
Appearance of objectivity for NV centers interacting with dynamically polarized nuclear environment
Creators: name: Kwiatkowski, Damian
name: Cywiński, Łukasz
name: Korbicz, Jarosław K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum-to-classical transition still eludes a full understanding. Out of its multiple aspects, one has recently gained an increased attention - the appearance of objective world out of the quantum. One particularly idea is that objectivity appears thanks to specific quantum state structures formation during the evolution, known as Spectrum Broadcast Structures (SBS). Despite that quite some research was already performed on this strongest and most fundamental form of objectivity, its practical realization in a concrete physical medium has not been analyzed so far. In this work, we study the possibility to simulate objectivization process via SBS formation using widely studied Nitrogen-Vacancy centers in diamonds. Assuming achievable limits of dynamical polarization technique, we show that for high, but experimentally viable polarizations ($p>0.5$) of nuclear spins and for magnetic fields lower than $\approx \! 20$ Gauss the state of the NV center and its nearest polarized environment approaches reasonably well an SBS state.
description: 14 pages, 7 figures
A Dirac sea pilot-wave model for quantum field theory
Creators: name: Colin, S.
name: Struyve, W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a pilot-wave model for quantum field theory in which the Dirac sea is taken seriously. The model ascribes particle trajectories to all the fermions, including the fermions filling the Dirac sea. The model is deterministic and applies to the regime in which fermion number is superselected. This work is a further elaboration of work by Colin, in which a Dirac sea pilot-wave model is presented for quantum electrodynamics. We extend his work to non-electromagnetic interactions, we discuss a cut-off regularization of the pilot-wave model and study how it reproduces the standard quantum predictions. The Dirac sea pilot-wave model can be seen as a possible continuum generalization of a lattice model by Bell. It can also be seen as a development and generalization of the ideas by Bohm, Hiley and Kaloyerou, who also suggested the use of the Dirac sea for the development of a pilot-wave model for quantum electrodynamics.
description: 41 pages, no figures, LaTex, v2 minor improvements and additions
ФАКТОРЫ СНИЖЕНИЯ КАЧЕСТВА ССУДНОЙ ЗАДОЛЖЕННОСТИ И ТРУДНОСТИ ЕЕ УПРАВЛЕНИЯ В КРЕДИТНЫХ ОРГАНИЗАЦИЯХ РОССИИ
Creators: name: ГУСЕЙНОВ РАСУЛ МАГОМЕДОВИЧ
Publisher: name: Финансовые рынки и банки
Year: 2021
Subjects: ССУДНАЯ ЗАДОЛЖЕННОСТЬ
КРЕДИТНЫЙ ПОРТФЕЛЬ
ССУДНЫЙ ПОРТФЕЛЬ
ЗАДОЛЖЕННОСТЬ
КРЕДИТОВАНИЕ
КРЕДИТНЫЕ ОРГАНИЗАЦИИ
КРЕДИТНЫЕ РИСКИ
УПРАВЛЕНИЕ КРЕДИТНЫМ ПОРТФЕЛЕМ
КАЧЕСТВО ССУДНОЙ ЗАДОЛЖЕННОСТИ
КАЧЕСТВО КРЕДИТНОГО ПОРТФЕЛЯ
LOAN DEBT
LOAN PORTFOLIO
DEBT
LENDING
CREDIT ORGANIZATIONS
CREDIT RISKS
LOAN PORTFOLIO MANAGEMENT
THE QUALITY OF THE LOAN DEBT
THE QUALITY OF THE LOAN PORTFOLIO

description: Научная статья посвящена исследовательскому анализу основных факторов внешней и внутренней среды кредитных организаций России, которые приводят к снижению качества ссудной задолженности и ухудшения процессов ее управления. Актуальность исследования данной предметной области обусловлена ухудшением условий банковской деятельности в Российской Федерации, что отражается на качестве задолженности контрагентов и приводит к росту просроченных долгов, предъявляя одновременно повышенные требования к кредитному менеджменту в коммерческих банках. Гипотеза исследования заключается в том, что в постпандемический период мы будем наблюдать существенное снижение качества ссудной задолженности российских кредитных организаций, где потребуются дополнительные усилия по поддержанию финансовой устойчивости институтов сектора, как на макро, так и микроуровне. В то же время в статье уделяется внимание теоретическим вопросам организации процесса управления кредитными рисками, проанализированы тенденции развития банковской системы Российской Федерации. Выделены основные факторы (позитивные и негативные), оказывающие влияние на качество ссудной задолженности, требующие соответствующего внимания в процессе управления кредитным портфелем в российских коммерческих банках. В заключении работы, автор приходит к выводу о том, что ключевыми факторами снижения качества ссудной задолженности, существенно усложняющие процесс управления в кредитных организациях Российской Федерации являются экономическая конъюнктура в постпандемический период, характеризующаяся ухудшением условий для хозяйственной деятельности предпринимательских структур. Учитывая, что кредитного портфеля отечественных банков приходится на коммерческое кредитование, институциональная среда и фундаментальный внешний фон функционирования бизнес-субъектов выступают главными факторами повышения или снижение уровня кредитных рисков.
A lattice of double wells for manipulating pairs of cold atoms
Creators: name: Sebby-Strabley, J.
name: Anderlini, M.
name: Jessen, P. S.
name: Porto, J. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe the design and implementation of a 2D optical lattice of double wells suitable for isolating and manipulating an array of individual pairs of atoms in an optical lattice. Atoms in the square lattice can be placed in a double well with any of their four nearest neighbors. The properties of the double well (the barrier height and relative energy offset of the paired sites) can be dynamically controlled. The topology of the lattice is phase stable against phase noise imparted by vibrational noise on mirrors. We demonstrate the dynamic control of the lattice by showing the coherent splitting of atoms from single wells into double wells and observing the resulting double-slit atom diffraction pattern. This lattice can be used to test controlled neutral atom motion among lattice sites and should allow for testing controlled two-qubit gates.
description: 9 pages, 11 figures Accepted for publication in Physical Review A
title: Motivational Factors in the Placebo Response: The Role of Effort and Intrinsic Motivation on Well-being in Therapeutic Interventions
Creators: name: Gaitan-Sierra, Linda Carolina
Publisher: name: University of Plymouth
Year: 2011

description: The file(s) associated with this record are no longer available. [JC][04.02.2013]
description: One of the most interesting aspects of human beings is their ability to choose a course of action and strive to achieve it. When participating in therapeutic interventions involving physical activities, people may allocate different amounts of effort, persistence and commitment to succeed in them. The reason for this difference lies in their motivation. The present thesis focuses on the energising of behaviour, that is, the differential effort and motivation that people put into therapeutic activities. Placebo responses are generally explained by the mechanisms of response expectancy, conditioning and motivational concordance. Findings presented in this thesis partially supported motivational concordance, testing for the first time that therapeutic outcome after engagement in intrinsically motivated tasks requiring physical activity was explained both by response expectancy and motivational concordance . The effects of response expectancy, perceptions of effort and intrinsic motivation on therapeutic benefit and mood change were investigated in both laboratory (Studies 1-4) and real-life therapeutic contexts (Study 5). Study 1 showed that effort mediated the effects of expectancy on perceived benefit, and effort predicted both positive and negative affect following the performance of a breathing exercise. Study 2 showed that differences in outcome between guided imagery and meditation were very small, but that non-specific factors play the major role in outcome. Study 3 showed that perceiving a task as difficult enhances effort perceptions, intrinsic motivation and therapeutic outcome. Motivated behaviour predicted therapeutic outcome but not expectancy. Study 4 showed that the provision of success feedback enhances outcome expectancies, motivated behaviour and mood change. Expectancies, motivation and effort predicted positive affect, whereas only effort predicted negative affect. Finally, results from Study 5 suggest that placebo responses may differ in real-life therapeutic interventions according to the strength motivational factors are elicited within the intervention. Both expectancy and motivated behaviour predicted change in positive affect, whereas motivated behaviour predicted change in negative affect and empowerment. Therapeutic outcome and its underlying mechanisms are likely to reflect a mixture of response expectancies and intervening motivational factors.
S-matrix Bootstrap for Effective Field Theories: Massless Pions
Creators: name: Guerrieri, Andrea
name: Penedones, Joao
name: Vieira, Pedro
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We use the numerical S-matrix bootstrap method to obtain bounds on the two leading Wilson coefficients of the chiral lagrangian controlling the low-energy dynamics of massless pions thus providing a proof of concept that the numerical S-matrix bootstrap can be used to derive non-perturbative bounds on EFTs in more than two spacetime dimensions.
description: 12 pages + appendices
Stability conditions on $A_n$-singularities
Creators: name: Ishii, Akira
name: Ueda, Kazushi
name: Uehara, Hokuto
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 14J17, 14J32, 18E30

description: We study the spaces of locally-finite stability conditions on the derived categories of coherent sheaves on the minimal resolutions of $A_n$-singularities supported at the exceptional sets. Our main theorem is that they are connected and simply-connected. The proof is based on the study of spherical objects in math.AG/0409151 and the homological mirror symmetry for $A_n$-singularities.
description: 43 pages, 3 figures. v2: many minor changes, published in J. Differential Geom.
Proceedings Fifteenth Workshop on Logical Frameworks and Meta-Languages: Theory and Practice
Creators: name: Coen, Claudio Sacerdoti
name: Tiu, Alwen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: This volume contains a selection of papers presented at LFMTP 2020, the 15th International Workshop on Logical Frameworks and Meta-Languages: Theory and Practice (LFMTP), held the 29-30th of June, 2019, using the Zoom video conferencing tool due to COVID restrictions. Officially the workshop was held in Paris, France, and it was affiliated with IJCAR 2020, FSCD 2020 and many other satellite events. Logical frameworks and meta-languages form a common substrate for representing, implementing and reasoning about a wide variety of deductive systems of interest in logic and computer science. Their design, implementation and their use in reasoning tasks, ranging from the correctness of software to the properties of formal systems, have been the focus of considerable research over the last two decades. This workshop will bring together designers, implementors and practitioners to discuss various aspects impinging on the structure and utility of logical frameworks, including the treatment of variable binding, inductive and co-inductive reasoning techniques and the expressiveness and lucidity of the reasoning process.
Διακύμανση υγρασίας σε θερμαινόμενο θερμοκήπιο με ηλιακό σύστημα εξοικονόμησης ενέργειας:
Creators: name: Καρανίκας, Ευθύμιος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Υβριδικό ηλιακό σύστημα εξοικονόμησης ενέργειας
Διακύμανση σχετικής υγρασίας
Θερμοκήπιο
Energy saving hybrid solar system
Variation of relative humidity
Greenhouse

description: Στην παρούσα εργασία διερευνήθηκε η διακύμανση της υγρασίας σε θερμοκήπιο, στο οποίο εγκαταστάθηκε υβριδικό ηλιακό σύστημα εξοικονόμησης ενέργειας συνδυασμένο με υδροπονική καλλιέργεια τομάτας σε υπόστρωμα πετροβάμβακα. Το υπόστρωμα τοποθετήθηκε πάνω σε σακούλα πολυαιθυλενίου που πληρώθηκε με νερό. Σε δεύτερο τμήμα του θερμοκηπίου, που χρησιμοποιήθηκε ως μάρτυρας, εφαρμόστηκε συμβατικό σύστημα θέρμανσης και το υπόστρωμα τοποθετήθηκε πάνω σε πλαστική υδρορροή. Η εφαρμογή του σύνθετου υβριδικού ηλιακού συστήματος συνέβαλε στην ομαλότερη διακύμανση της θερμοκρασίας στο πειραματικό τμήμα του θερμοκηπίου αλλά οδήγησε σε υψηλότερες τιμές σχετικής υγρασίας συγκριτικά με το τμήμα του μάρτυρα. Όσον αφορά το έλλειμμα κορεσμού στον αέρα του θερμοκηπίου και τα δύο τμήματα παρουσίασαν τιμές αρκετά χαμηλότερες από την κρίσιμη τιμή των 0.5kPa που είναι το όριο κάτω από το οποίο εμφανίζονται ασθένειες στα φυτά.
description: In the present research the fluctuation of air humidity was investigated in a greenhouse, where energy saving hybrid solar system was installed combined with hydroponic tomato cultivation in rockwool substrates. The substrates were placed above polyethylene sleeves filled with water. In another part of the greenhouse, which was used as control, conventional heating system was applied and the substrates were placed on a plastic gutter. The application of the particular complex hybrid solar system led to better air temperature variation in the experimental part of the greenhouse but led to higher air relative humidity values, compared to the control part of the greenhouse. Concerning to vapour pressure deficit, both parts of the greenhouse presented lower values compared to the value of 0.5kPa which is the critical point underneath of it plant diseases will occur to the tomato cultivation.
Revisiting element removal for density-based structural topology optimization with reintroduction by Heaviside projection
Creators: name: Behrou, Reza
name: Lotfi, Reza
name: Carstensen, Josephine Voigt
name: Ferrari, Federico
name: Guest, James K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We present a strategy grounded in the element removal idea of Bruns and Tortorelli [1] and aimed at reducing computational cost and circumventing potential numerical instabilities of density-based topology optimization. The design variables and the relative densities are both represented on a fixed, uniform finite element grid, and linked through filtering and Heaviside projection. The regions in the analysis domain where the relative density is below a specified threshold are removed from the forward analysis and replaced by fictitious nodal boundary conditions. This brings a progressive cut of the computational cost as the optimization proceeds and helps to mitigate numerical instabilities associated with low-density regions. Removed regions can be readily reintroduced since all the design variables remain active and are modeled in the formal sensitivity analysis. A key feature of the proposed approach is that the Heaviside functions promote material reintroduction along the structural boundaries by amplifying the magnitude of the sensitivities inside the filter reach. Several 2D and 3D structural topology optimization examples are presented, including linear and nonlinear compliance minimization, the design of a force inverter, and frequency and buckling load maximization. The approach is shown to be effective at producing optimized designs equivalent or nearly equivalent to those obtained without the element removal, while providing remarkable computational savings.
Many-body computing on Field Programmable Gate Arrays
Creators: name: Lv, Songtai
name: Liang, Yang
name: Meng, Yuchen
name: Yao, Xiaochen
name: Xu, Jincheng
name: Liu, Yang
name: Zheng, Qibin
name: Zou, Haiyuan
Publisher: name: arXiv
Year: 2024
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A new implementation of many-body calculations is of paramount importance in the field of computational physics. In this study, we leverage the capabilities of Field Programmable Gate Arrays (FPGAs) for conducting quantum many-body calculations. Through the design of appropriate schemes for Monte Carlo and tensor network methods, we effectively utilize the parallel processing capabilities provided by FPGAs. This has resulted in a tenfold speedup compared to CPU-based computation for a Monte Carlo algorithm. By using a supercell structure and simulating the FPGA architecture on a CPU with High-Level Synthesis, we achieve $O(1)$ scaling for the time of one sweep, regardless of the overall system size. We also demonstrate, for the first time, the utilization of FPGA to accelerate a typical tensor network algorithm for many-body ground state calculations. Additionally, we show that the current FPGA computing acceleration is on par with that of multi-threaded GPU parallel processing. Our findings unambiguously highlight the significant advantages of hardware implementation and pave the way for novel approaches to many-body calculations.
description: 10+8 pages, 5+7 figures. Round 4
Thraxions : Ultralight throat Axions
Creators: name: Moritz, Jakob
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019

description: 27th International Conference on Supersymmetry and Unification of Fundamental Interactions, SUSY 2019, Corpus Christi, USA, 20 May 2019 - 24 May 2019
description: We argue that a new type of ultra light axion is generically present in the type IIB part of the string theory landscape. It arises when fluxes stabilize Calabi-Yau manifolds near a conifold transition locus in moduli space. After accounting for ten-dimensional backreaction the scalar potential features a finite axion monodromy with overall scale far smaller than the weak gravity conjecture for axions would predict. Moreover we identify a mechanism for generating super-Planckian axionic field ranges which we call drifting monodromies. However, in the examples we consider, the potential oscillates on sub-Planckian distances in field space, preventing us from building a natural inflation model on the basis of this idea.
de Sitter vacua from string theory?
Creators: name: Moritz, Jakob
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019

description: blackboard seminar, Groningen, Centre for Theoretical Physics,University of Groningen, Netherlands
description: The simplest bottom-up explanation for the current accelerated expansion of our universe is a positive cosmological constant. However, it is notoriously difficult to realize this in string theory. We discuss what are generic difficulties encountered in string model building and emphasize the particular role played by the KKLT proposal in the recent debate surrounding the "no-dS conjecture". We outline how KKLT passes non-trivial 10d consistency requirements. However, we also explain how simple geometrical consistency constraints indicate a generic difficulty to find parametrically controlled SUSY breaking AdS or dS vacua as opposed to run-away solutions only.