cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Self-organized topological insulator due to cavity-mediated correlated tunneling
Creators: name: Chanda, Titas
name: Kraus, Rebecca
name: Morigi, Giovanna
name: Zakrzewski, Jakub
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Topological materials have potential applications for quantum technologies. Non-interacting topological materials, such as e.g., topological insulators and superconductors, are classified by means of fundamental symmetry classes. It is instead only partially understood how interactions affect topological properties. Here, we discuss a model where topology emerges from the quantum interference between single-particle dynamics and global interactions. The system is composed by soft-core bosons that interact via global correlated hopping in a one-dimensional lattice. The onset of quantum interference leads to spontaneous breaking of the lattice translational symmetry, the corresponding phase resembles nontrivial states of the celebrated Su-Schriefer-Heeger model. Like the fermionic Peierls instability, the emerging quantum phase is a topological insulator and is found at half fillings. Originating from quantum interference, this topological phase is found in "exact" density-matrix renormalization group calculations and is entirely absent in the mean-field approach. We argue that these dynamics can be realized in existing experimental platforms, such as cavity quantum electrodynamics setups, where the topological features can be revealed in the light emitted by the resonator.
description: 10 pages, 7 figures, accepted in Quantum
Energy Quantisation in Bulk Bouncing Tachyon
Creators: name: Hirano, Shinji
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We argue that the closed string energy in the bulk bouncing tachyon background is to be quantised in a simple manner as if strings were trapped in a finite time interval. We discuss it from three different viewpoints; (1) the timelike continuation of the sinh-Gordon model, (2) the dual matrix model description of the (1+1)-dimensional string theory with the bulk bouncing tachyon condensate, (3) the c_L=1 limit of the timelike Liouville theory with the dual Liouville potential turned on. There appears to be a parallel between the bulk bouncing tachyon and the full S-brane of D-brane decay. We find the critical value λ_c of the bulk bouncing tachyon coupling which is analogous to λ_o=1/2 of the full S-brane coupling, at which the system is thought to be at the bottom of the tachyon potential.
description: 25 pages, minor changes, one reference added
Antiphase Oscillations in the Time-Resolved Spin Structure Factor of a Photoexcited Mott Insulator
Creators: name: Tsutsui, Kenji
name: Shinjo, Kazuya
name: Tohyama, Takami
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Motivated by the recent development of time-resolved resonant-inelastic x-ray scattering (TRRIXS) in photoexcited antiferromagnetic Mott insulators, we numerically investigate momentum-dependent transient spin dynamics in a half-filled Hubbard model on a square lattice. After turning off a pumping photon pulse, the intensity of a dynamical spin structure factor temporally oscillates with frequencies determined by the energy of two magnons in the antiferromagnetic Mott insulator. We find an antiphase behavior in the oscillations between two orthogonal momentum directions, parallel and perpendicular to the electric field of a pump pulse. The phase difference comes from the $B_{1g}$ channel of the two-magnon excitation. Observing the antiphase oscillations will be a big challenge for TRRIXS experiments when their time resolution will be improved by more than an order of magnitude.
description: 5 pages, 4 figures
INTRAHOUSEHOLD IMPACT OF THE TRANSFER OF MODERN AGRICULTURAL TECHNOLOGY: A GENDER PERSPECTIVE
Creators: name: Naved, Ruchira Tabassum
name: Naved, Ruchira Tabassum
Publisher: name: Unknown
Year: 2000
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This study explores the intrahousehold impact of transfer of modern agricultural technology from a gender perspective. The data suggest that group-based programs targeting women have a greater potential to address gender relations within the household and society than do programs targeting women as individuals. In male-dominated societies where women have limited access to internal or external support networks, programs targeting women as individuals that do not also provide alternative sources of support are bound to fail in their gender goals.
Fluid velocity from transverse momentum spectra
Creators: name: Guillen, Anthony
name: Ollitrault, Jean-Yves
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We parametrize the transverse momentum distribution of outgoing hadrons in ultrarelativistic nucleus-nucleus collisions as a superposition of boosted thermal distributions. In this approach, which generalizes the conventional blast wave, the momentum distribution is determined by the distribution of the fluid velocity. We analyze the difference between this generalized blast-wave parametrization and a full hydrodynamic calculation. We then apply the generalized blast-wave fit to experimental data on Pb+Pb collisions at $\sqrt{s_{\rm NN}}=2.76\ \mathrm{TeV}$. The fit is reasonable up to $p_t\sim 6\ \mathrm{GeV}$, much beyond the range where hydrodynamics is usually applied, but not perfect. Based on the differences between the fit and the data, we argue that an ideal hydrodynamic calculation cannot fit simultaneously all identified particle spectra, irrespective of the specific implementation. In particular, data display a significant excess of pions at low $p_t$, whose physical interpretation is discussed. Data also show that the distribution of the fluid velocity becomes broader as the collision becomes less central. This broadening is explained by event-by-event hydrodynamic calculations, where it results from the centrality dependence of initial-state fluctuations.
description: Published version; 13 pages, 9 figures
The Aharonov-Bohm Effect in Noncommutative Quantum Mechanics
Creators: name: Li, Kang
name: Dulat, Sayipjamal
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Aharonov-Bohm (AB) effect in non-commutative quantum mechanics (NCQM) is studied. First, by introducing a shift for the magnetic vector potential we give the Schr$\ddot{o}$dinger equations in the presence of a magnetic field on NC space and NC phase space, respectively. Then by solving the Schr$\ddot{o}$dinger equations, we obtain the Aharonov-Bohm (AB) phase on NC space and NC phase space, respectively.
description: 5 RevTex pages, references added, typos corrected
Exact Solutions of (deformed) Jackiw-Teitelboim Gravity
Creators: name: Momeni, Davood
name: Channuie, Phongpichit
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is well known that Jackiw-Teitelboim (JT) gravity posses the simplest theory on 2-dimensional gravity. The model has been fruitfully studied in recent years. In the present work, we investigate exact solutions for both JT and deformed JT gravity recently proposed in the literature. We revisit exact Euclidean solutions for Jackiw-Teitelboim gravity using all the non-zero components of the dilatonic equations of motion using proper integral transformation over Euclidean time coordinate. More precisely, we study exact solutions for hyperbolic coverage, cusp geometry and another compact sector of the AdS$_2$ spacetime manifold.
description: v3: 18 pages, no figure, changes reflected the reviewer's comments, version to appear in European Physical Journal C
Декорированные роговые пластины XII века из археологического слоя Пскова и сюжет борьбы кентавра со зверем в древнерусском искусстве
Creators: name: Слапиня Анна Андрисовна
Publisher: name: Вестник сектора древнерусского искусства
Year: 2020
Subjects: Кентавр
китоврас
декоративно-прикладное искусство
древнерусское искусство
романское искусство
XII век
Псков
Вислица
астрономия
Аратея

description: Статья посвящена исследованию изображений кентавров в искусстве Древней Руси домонгольского времени (до середины XIII в.). Проводится разделение значений слов «кентавр» и «китоврас». Древнерусские примеры сопоставляются с западноевропейскими и византийскими. Дается классификация известных в Средние века литературных сюжетов с кентаврами, нашедших отражение в изобразительном искусстве. В том числе выделяются изображения, ассоциированные со средневековыми «Аратеями», где в виде этих существ были представлены созвездия Центавра и Стрельца. Особое внимание в статье уделено двум костяным пластинам с изображениями кентавра и зверя, датированным XII в., из археологических раскопок в Пскове. Высказывается предположение о том, что эти образы иллюстрируют сюжет борьбы созвездий Центавра и Лупуса и созданы под влиянием западноевропейского искусства. В качестве иконографического аналога псковскому памятнику приводится пример из польского романского искусства XII в.—изображение на плите пола, найденное при археологических раскопках в г. Вислице (Польша).
Skowronek, Alfons, Sakrament in der evangelischen Theologie der Gegenwart
Creators: name: Jaspert, Bernd
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 23 Nr. 3 (1974): Ökumenische Rundschau, Band 23, Heft 3
On the group-like behaviour of the Le-Murakami-Ohtsuki invariant
Creators: name: Jackson, David M.
name: Moffatt, Iain
name: Morales, Alejandro
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: We study the effect of Feynman integration and diagrammatic differential operators on the structure of group-like elements in the algebra generated by coloured vertex-oriented uni-trivalent graphs. We provide applications of our results to the study of the LMO invariant, a quantum invariant of manifolds. We also indicate further situations in which our results apply and may prove useful. The enumerative approach that we adopt has a clarity that has enabled us to perceive a number of generalizations.
description: Typos and minor mistakes corrected
Rehabilitation of reinforced concrete beams with sprayed glass fiber reinforced polymers
Creators: name: Boyd, Andrew James
Publisher: name: University of British Columbia
Year: 2009

description: Worldwide, a great deal of research is currently being conducted concerning the use of fibre reinforced plastic wraps or laminates in the repair and strengthening of reinforced concrete members. It has been shown that such techniques can be both effective and economical when compared to the existing practice of retrofitting with steel plates. One of the most significant advantages of such systems is the labour cost savings achieved through their ease of application. A novel technique which further simplifies the application procedure is to apply the fibre using a spraying process. By spraying the fibres onto the member surface concurrently with a suitable matrix resin, a two dimensional random distribution of discontinuous fibres is obtained. This work reports the first usage of a sprayed glass fibre reinforced plastic (GFRP) retrofit system on reinforced concrete beams. Using E-glass fibres embedded in a polyester matrix, it was shown that significant increases in load carrying capacity, member stiffness and fracture energy can be achieved with such a system. A comparison of results obtained from small scale specimens with those available from current literature was performed. The sprayed glass FRP procedure produced results similar to those obtained with FRP fabric wraps or plate bonding techniques for flexural strengthening. When used for shear strengthening, the sprayed FRP outperformed all of the other techniques. An analysis technique was developed to predict the ultimate load carrying ability of FRP retrofitted beams as well as their load-deflection behaviour up to failure. In the rehabilitation of large scale bridge channel beams, the sprayed FRP technique was found to be more effective than a commercially available continuous fabric system at upgrading structural properties. An economic comparison revealed that the material costs associated with the sprayed approach can result in a significant savings compared to that same system.
[Southern Pomo and Wappo texts]
Creators: name: Allen, Elsie
name: Oswalt Family
name: Oswalt, Robert L.
name: Somersal, Laura
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2015
Subjects: subject: peq
subject: Southern Pomo language
subject: wao
subject: Wappo language

description: Typed transcription and translation of Warm Springs Dam dedication texts, in Southern Pomo and Wappo.
Diffusion processes in germanium and silicon films grown on Si$_3$N$_4$ substrates
Creators: name: Arapkina, Larisa V.
name: Chizh, Kirill V.
name: Stavrovskii, Dmitry B.
name: Dubkov, Vladimir P.
name: Lazareva, Elizabeth P.
name: Yuryev, Vladimir A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this article, the results of investigation of processes occurring during the molecular-beam deposition of germanium layers on Si$_3$N$_4$ dielectric substrates within a wide range of the Ge film growth temperatures (30 to 600°C) are presented. The intensity of the IR absorption bands related to the vibrations of the N$-$H and Si$-$N bonds are established to decrease with the increase of the Ge deposition temperature. It appears that this phenomenon cannot be explained only as a thermally activated process. Simultaneously, the peak corresponding to the Ge$-$N vibration bonds emerges in the X-ray photoelectron spectra. We suppose that the deposition of germanium layers on Si3N4 dielectric substrates containing hydrogen atoms causes the diffusion of hydrogen atoms from the dielectric layer into the growing film. The experimental results may be interpreted in terms of a model, according to which the migration of hydrogen atoms from the Si$_3$N$_4$ layer into the growing germanium film is due to the difference in chemical potentials of hydrogen atoms in the dielectric layer and the germanium film. This process initiates the diffusion of germanium atoms in the opposite direction, into the Si$_3$N$_4$ layer, where they connect to free bonds of nitrogen atoms arising due to the escape of hydrogen atoms. The analogous processes occur during the deposition of silicon layers on Si$_3$N$_4$ substrates.
description: 38 pages, 9 figures
Microcanonical foundation of nonextensivity and generalized thermostatistics based on the fractality of the phase space
Creators: name: Garcia-Morales, V.
name: Pellicer, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We develop a generalized theory of (meta)equilibrium statistical mechanics in the thermodynamic limit valid for both smooth and fractal phase spaces. In the former case, our approach leads naturally to Boltzmann-Gibbs standard thermostatistics while, in the latter, Tsallis thermostatistics is straightforwardly obtained as the most appropriate formalism. We first focus on the microcanonical ensemble stressing the importance of the limit $t \to \infty$ on the form of the microcanonical measure. Interestingly, this approach leads to interpret the entropic index $q$ as the box-counting dimension of the (microcanonical) phase space when fractality is considered.
description: 14 pages, 1 table, no figures. Accepted for publication in Physica A
Towards the design of chemical reactions: Machine learning barriers of competing mechanisms in reactant space
Creators: name: Heinen, Stefan
name: von Rudorff, Guido Falk
name: von Lilienfeld, O. Anatole
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: While sophisticated numerical methods for studying equilibrium states have well advanced, quantitative predictions of kinetic behaviour remain challenging. We introduce a reactant-to-barrier (R2B) machine learning model that rapidly and accurately infers activation energies and transition state geometries throughout chemical compound space. R2B enjoys improving accuracy as training sets grow, and requires as input solely molecular graph information of the reactant. We provide numerical evidence for the applicability of R2B for two competing text-book reactions relevant to organic synthesis, E2 and SN2, trained and tested on chemically diverse quantum data from literature. After training on 1k to 1.8k examples, R2B predicts activation energies on average within less than 2.5 kcal/mol with respect to Coupled-Cluster Singles Doubles (CCSD) reference within milliseconds. Principal component analysis of kernel matrices reveals the hierarchy of the multiple scales underpinning reactivity in chemical space: Nucleophiles and leaving groups, substituents, and pairwise substituent combinations correspond to systematic lowering of eigenvalues. Analysis of R2B based predictions of ~11.5k E2 and SN2 barriers in gas-phase for previously undocumented reactants indicates that on average E2 is favored in 75% of all cases and that SN2 becomes likely for nucleophile/leaving group corresponding to chlorine, and for substituents consisting of hydrogen or electron-withdrawing groups. Experimental reaction design from first principles is enabled thanks to R2B, which is demonstrated by the construction of decision trees. Numerical R2B based results for interatomic distances and angles of reactant and transition state geometries suggest that Hammond's postulate is applicable to SN2, but not to E2.
CHILD LABOR AND SCHOOL DECISIONS IN URBAN AND RURAL AREAS: CROSS COUNTRY EVIDENCE
Creators: name: Ersado, Lire
name: Ersado, Lire
Publisher: name: Unknown
Year: 2003
Subjects: Labor and Human Capital

description: Child labor is widespread in developing countries, but its causes are debatable. Poverty is considered the primary reason, but many theoretical and empirical analyses show that other factors, such as lack of access to credit, poor school quality, and labor market opportunities play equal or even greater roles in the decision to have children work. This study surveys the existing literature and, taking into account urban-rural divides, aims to shed light on the debate with empirical evidence from Nepal, Peru, and Zimbabwe. We find that while poverty drives child work and schooling in rural areas, it does not appear to significantly influence such decisions in urban areas. This suggests that policies such as trade sanctions or a ban on child labor in rural areas could have an adverse effect as child labor decisions in such areas are more likely a response to poverty and subsistence requirements. Similarly, improving access to credit has greater potential for alleviating child labor and enhancing school enrollment in rural than urban areas, particularly in Nepal and Zimbabwe. On the other hand, the availability of alternative childcare options appears to considerably decrease child labor and create conditions for higher school attendance rates in urban than in rural areas. Finally, evidence from all three countries indicates that efforts to bolster adult educational levels and wages will help curb the prevalence and intensity of child labor and improve the likelihood that children stay in school.
Древняя икона Богоматери Одигитрии из Снетогорского монастыря и ее место в псковском искусстве
Creators: name: Шалина Ирина Александровна
Publisher: name: Вестник сектора древнерусского искусства
Year: 2020
Subjects: Византийская и древнерусская живопись рубежа XIII–XIV вв.
Псков
Снетогорский монастырь
переписные книги монастырского имущества
художественный стиль
иконография Одигитрии.

description: Изучение переписных книг Псковской земли позволяет определить происхождение ряда древних икон XIV в., в том числе образов Одигитрии и Вседержителя (Елеазаровского), прославившегося в Пскове как чудотворный (обе из Псковского музея), а также Бориса и Глеба (ГТГ), входивших в убранство собора Рождества Богородицы Снетогорского монастыря (1309), расписанного в 1313 г. При этом монументальная поклонная икона Одигитрии составляла единый ансамбль с изображениями преподобных в нижнем регистре фресок восточной стены храма, построенного на месте мученической гибели от рук немецких рыцарей первого игумена и братии и задуманного как патронально-поминальный пантеон. Композиция Одигитрии, восходящая к византийской иконографии типа кипрского образа Богоматери Аракиотиссы (1192), на Руси известна лишь по памятникам Пскова и начиная с XIII в. становится здесь невероятно устойчивой. Уникальные особенности снетогорской иконы, прежде всего фигуры кадящих ангелов по сторонам Богородицы, объясняются поминальной функцией памятника. Художественные особенности не оставляют сомнений, что образ создавался одновременно с росписью собора 1313 г. его главным мастером, представлявшим ведущую линию искусства Пскова, отражавшую духовные поиски как крайней аскезы, центром которой в эти годы становится Снетогорский монастырь; так и идеалы городской элиты, чьи представители были его главными ктиторами.
Superfluidity and binary-correlations within clusters of fermions
Creators: name: Milstein, J. N.
name: Burnett, K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We propose a method for simulating the behaviour of small clusters of particles that explicitly accounts for all mean-field and binary-correlation effects. Our approach leads to a set of variational equations that can be used to study both the dynamics and thermodynamics of these clusters. As an illustration of this method, we explore the BCS-BEC crossover in the simple model of four fermions, interacting with finite-range potentials, in a harmonic potential. We find, in the crossover regime, that the particles prefer to occupy two distinct pair states as opposed to the one assumed by BCS theory.
Potential Cost Savings from Discharge Permit Trading to meet TDMLs for Phosphorus in the Passic River Watershed
Creators: name: Sado, Yukako
name: Boisvert, Richard N.
name: Poe, Gregory L.
name: Sado, Yukako
name: Boisvert, Richard N.
name: Poe, Gregory L.
Publisher: name: Unknown
Year: 2007
Subjects: Resource /Energy Economics and Policy

description: We use the non-tidal Passaic River Watershed as a case study to investigate the size of potential cost savings associated with allowing phosphorus emissions trading amongst Waste Water Treatment Plants (WWTP) to achieve a significant reduction in ambient phosphorus levels. To measure the cost saving, we specify a trading-ratio system similar to that proposed recently by Hung and Shaw (JEEM, 2005) that minimizes the abatement cost of meeting environmental standards. Because there are relatively few potential traders and abatement costs are relatively homogeneous across firms, the cost savings to the 22 municipal waste water treatment plants relative to the base case will be on the order of 7%. We believe that these results fail to support efforts to establish a permit exchange market structure in the Passaic Watershed such as the one celebrated with the success of the U.S. acid rain trading program. Rather, our results suggest quite a different strategy for water quality trading in small watersheds such as the Passaic, where there are relatively few potential traders and abatement costs are relatively homogeneous across firms. In these situations, trading programs should instead be designed to identify the subset of firms that will gain substantially from trade in pollution permits and to nurture trade amongst these firms. Furthermore, because markets in such watersheds are relatively thin and investments in pollution abatement capacity are costly and lumpy and must be framed within five-year permit cycles, it is likely that these structured bilateral opportunities for trade will need to take the form of multiyear contracts.
Policy Implications of Crop Yield and Revenue Variability at Differing Levels of Disaggregation
Creators: name: Coble, Keith H.
name: Dismukes, Robert
name: Thomas, Sarah E.
name: Coble, Keith H.
name: Dismukes, Robert
name: Thomas, Sarah E.
Publisher: name: Unknown
Year: 2007
Subjects: Agricultural and Food Policy

description: Revenue variability at different levels of aggregation has been the focus of several proposals to reform U.S. commodity programs with the 2007 farm bill. In this paper, we estimate revenue variabilityyear-to-year deviations from expected revenue for corn, soybeans, and cotton at four levels of aggregation: national, state, county and farm. We examine the factors that cause revenue variability and how differences across crops and regions would affect producers risks. We find that national-level revenue variability is nearly double national-level yield variability. Spatial disaggregation increases price and yield variability, but yield variability increases more rapidly than price and revenue variability. A hypothetical national-level revenue program would reduce risk at the average farm-level by slightly more than 8 percent for corn, about 7 percent for soybeans and about 21 percent for cotton. If one integrates farm-level revenue coverage with the national-level program the percent risk reduction more than doubles for both corn and soybeans. Although the increase in risk reduction between the simple national and the integrated program is proportionately less for cotton, the total risk reduction for cotton is the greatest among the three crops.
Protein folding dynamics via quantification of kinematic energy landscape
Creators: name: Kachalo, Sëma
name: Lu, Hsiao-Mei
name: Liang, Jie
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biomolecules (q-bio.BM)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We study folding dynamics of protein-like sequences on square lattice using physical move set that exhausts all possible conformational changes. By analytically solving the master equation, we follow the time-dependent probabilities of occupancy of all 802,075 conformations of 16-mers over 7-orders of time span. We find that (i) folding rates of these protein-like sequences of same length can differ by 4-orders of magnitude, (ii) folding rates of sequences of the same conformation can differ by a factor of 190, and (iii) parameters of the native structures, designability, and thermodynamic properties are weak predictors of the folding rates, rather, basin analysis of the kinematic energy landscape defined by the moves can provide excellent account of the observed folding rates.
description: 4 pages, 4 figures
Estimation and Analysis of Rational Expectations Model of International Cotton Market
Creators: name: Tokovenko, Oleksiy
name: Gunter, Lewell F.
name: Vedenov, Dmitry V.
name: Tokovenko, Oleksiy
name: Gunter, Lewell F.
name: Vedenov, Dmitry V.
Publisher: name: Unknown
Year: 2007
Subjects: subject: International Relations/Trade
subject: Marketing
subject: FOS: Economics and business

description: The paper outlines an approach to estimation and analysis of rational expectations international cotton market. A multiple model bootstrap filter is used to compute unobserved market expectations and their distributions. Estimation results are used to analyze the welfare effects of exogenous trade shocks and government programs, with application to the national market security.
Новооткрытая новгородская икона XV века «Избранные святые» в частном собрании в Москве. Особенности иконографии и стиля
Creators: name: Смирнова Энгелина Сергеевна
Publisher: name: Вестник сектора древнерусского искусства
Year: 2020
Subjects: Икона
новгородская живопись
святые целители
избранные святые
двухъярусная композиция
вариации образов
традиции палеологовского искусства

description: Статья посвящена новгородской иконе XV в., «Избранные святые», которая в 2019 г. была приобретена формирующимся в Москве частным собранием Н.В.Шутова и раскрыта из-под потемневшей олифы В.В.Барановым. В основном, верхнем, ярусе иконы изображены свв. Власий, Василий Великий, Флор и Лавр (все, кроме Василия Великого, связаны с темой исцеления, при акценте на лечение скота, но с учетом и более широкого смысла), а в относительно узком нижнем ярусе — свв. Козьма, Демьян и Анастасия (все трое — с атрибутами врачей-целителей). Новооткрытое произведение относится приблизительно к середине — третьей четверти XV в. и является одной из лучших среди известных сейчас новгородских икон этого столетия. Возможно, героический оттенок в образной характеристике святых, представленных в новгородской иконе XV в., отражает сохранявшуюся в местном искусстве художественную традицию предшествующего столетия.
The Entrepreneur's Choice of Location: Evidence from the Life Sciences
Creators: name: Kolympiris, Christos
name: Klein, Peter G.
name: Kalaitzandonakes, Nicholas G.
name: Kolympiris, Christos
name: Klein, Peter G.
name: Kalaitzandonakes, Nicholas G.
Publisher: name: Unknown
Year: 2007
Subjects: subject: Industrial Organization
subject: entrepreneurship
subject: biotechnology
subject: clusters
subject: knowledge spillovers
subject: agglomeration economies

description: Why do biotech firms cluster? New and established firms in biotech clusters are said to capitalize on knowledge spillovers, labor-market pooling, and other externalities. Some have even argued that such spillovers are so strong that the cluster itself, rather than the individual, is the locus of entrepreneurship. Such arguments, however, do not resolve the mechanism by which clusters might contribute to the establishment of new firms. This paper proposes a conceptual framework for analyzing the locational choices of entrepreneurial firms in the life-sciences industry. Building on both the cluster literature and the literature on entrepreneurship, we develop hypotheses about how cluster characteristics, the entrepreneur's personal characteristics, and characteristics of the business environment affect the entrepreneur's decision to establish a new firm. We argue that a key factor in the location decision is the relative mobility of the appropriate resources. Our main hypothesis is that specialized labor is less mobile than capital and other resources and that it is the base from which entrepreneurs are ultimately created. If so, new firms will emerge in areas characterized by an existing concentration of specialized labor. This labor pool may be spawned by universities and incumbent small and larger biotech (or other high-technology) companies. An alternative explanation is that entrepreneurs establish new ventures outside the cluster, then move them to the cluster to take advantage of local knowledge and other resources. Or a potential entrepreneur could conceive a business plan, then relocate to an existing cluster before founding a firm. We explain how survey data can be used to sort through these explanations.
Extreme Parametric Sensitivity in the Steady-State Photoisomerization of Model Retinal
Creators: name: Chuang, Chern
name: Brumer, Paul
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The photoisomerization reaction of the retinal chromophore in rhodopsin was computationally studied using a two-state two-mode model coupled to thermal baths. Reaction quantum yields at the steady state (10 ps and beyond) were found to be considerably different than their transient values, suggesting a weak correlation between transient and steady-state dynamics in these systems. Significantly, the steady-state quantum yield was highly sensitive to minute changes in system parameters, while transient dynamics was nearly unaffected. Correlation of such sensitivity with standard level spacing statistics of the nonadiabatic vibronic system suggests a possible origin in quantum chaos. The feasibility of experimental observation of this phenomenon and its implications in condensed-phase photochemistry and biological light sensing are discussed.
description: 20 pages, 5 figures including TOC
Extended chromatic symmetric functions and equality of ribbon Schur functions
Creators: name: Aliniaeifard, Farid
name: Wang, Victor
name: van Willigenburg, Stephanie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: Primary 05E05, Secondary 05C15, 05C25, 05C38, 16T30

description: We prove a general inclusion-exclusion relation for the extended chromatic symmetric function of a weighted graph, which specializes to (extended) $k$-deletion, and we give two methods to obtain numerous new bases from weighted graphs for the algebra of symmetric functions. Moreover, we classify when two weighted paths have equal extended chromatic symmetric functions by proving this is equivalent to the classification of equal ribbon Schur functions. This latter classification is dependent on the operation composition of compositions, which we generalize to composition of graphs. We then apply our generalization to obtain infinitely many families of weighted graphs whose members have equal extended chromatic symmetric functions.
description: Final version to appear Adv. in Appl. Math
Reducing Crop Nutrient Applications: The Yield Reserve Program
Creators: name: Metcalfe, Todd
name: Bosch, Darrell J.
name: Pease, James W.
name: Metcalfe, Todd
name: Bosch, Darrell J.
name: Pease, James W.
Publisher: name: Unknown
Year: 2007
Subjects: subject: Crop Production/Industries
subject: compliance cost
subject: nitrogen fertilizer
subject: nonpoint source pollution
subject: policy
subject: yield response function

description: A proposed Yield Reserve Program designed to compensate farmers for any reduced yields resulting from reduced nitrogen (N) application rates below recommended rates is evaluated. Assuming that farmers currently follow extension recommendations for applying N, Yield Reserve Program participation reduces expected net revenue by $10 to $13/ha. The Yield Reserve Program reduces expected net revenue by $17 to $20/ha for farmers who apply N to maximize expected net revenue. Farmers' costs of participation increase with lower probabilities of inadequate rainfall and higher corn prices and decline with higher N prices. The Yield Reserve Program can significantly reduce N applications to cropland, which may reduce N content of surface waters, but the costs to taxpayers and farmers will depend on how the program is implemented.
Do the Largest Firms Grow the Fastest? The Case of U.S. Dairies
Creators: name: Melhim, Almuhanad
name: O'Donoghue, Erik J.
name: Shumway, C. Richard
name: Melhim, Almuhanad
name: O'Donoghue, Erik J.
name: Shumway, C. Richard
Publisher: name: Unknown
Year: 2007
Subjects: Livestock Production/Industries
Productivity Analysis

description: We analyze growth and diversification of U.S. dairy farms by examining longitudinal changes in ten size cohorts and new entrants through three successive censuses. Gibrat's law (random walk) and mean reversion hypotheses of growth are tested and rejected. Growth rates are bimodal with the largest farm cohort growing the fastest. All cohorts become more diversified over time, and smaller farms diversify most rapidly. New entrants are generally large, and they diversify more rapidly than incumbents. These data suggest that scale economies persist even for the largest cohort of dairy farms and that scale economies dominate scope economies for large farms.
description: Replaced with revised version of paper 06/29/07.
Do Agricultural Preservation Programs Affect Farmland Conversion?
Creators: name: Liu, Xiangping
name: Lynch, Lori
name: Liu, Xiangping
name: Lynch, Lori
Publisher: name: Unknown
Year: 2007
Subjects: subject: Land Economics/Use
subject: agricultural preservation programs
subject: farmland
subject: propensity score
subject: farmland conversion
subject: urban-rural interface

description: More than 124 governmental entities concerned about suburban sprawl and farmland loss have implemented farmland preservation programs preserving 1.67 million acres at a cost of $3.723 billion. We ask how effective are these programs in slowing the rate of farmland loss. Using a unique 50-year 269 county panel data set on preservation programs and farmland loss for six Mid-Atlantic States, we employ the propensity score matching method to find strong empirical evidence that these programs have had a statistically significant effect on the rate of farmland loss. Preservation programs on average decrease the rate of farmland loss by 2.4 percentage points; a 33% decrease from the average 5-year rate of 7.31%.
Modeling Economic Impacts of the European Green Crab
Creators: name: Lovell, Sabrina J.
name: Besedin, Elena Y.
name: Grosholz, Edwin
name: Lovell, Sabrina J.
name: Besedin, Elena Y.
name: Grosholz, Edwin
Publisher: name: Unknown
Year: 2007
Subjects: Resource /Energy Economics and Policy

description: The European green crab, Carcinus maenas, is one of the most widely distributed invasive species in coastal systems. This species has become established on five continents and has produced significant negative ecological and economic impacts in many areas. On the Atlantic coast of North America, green crabs have been established for at least 180 years. On the Pacific coast, green crabs became established in San Francisco Bay in the late 1980s and expanded their range rapidly during the 1990s. In response to the spread and impacts of green crabs in the U.S., Carcinus maenas was listed as an aquatic nuisance species by the federal Aquatic Nuisance Species Task Force (ANSTF). To date, there have been no formal review of the ecological impacts of green crabs and no formal attempts to quantify and understand their potential economic impacts. This paper presents a predictive framework for understanding the magnitude and extent of green crab impacts on the East and West Coasts of the U.S. The framework consists of several linked models. The ecological sub-models incorporate green crab dispersal and relationship between green crab abundance and the dynamics of prey populations. The economic analysis focuses on the green crab impacts on commercial shellfisheries and estuarine restoration efforts. The documented historical and present impacts of green crabs on the shellfishery include soft-shell clams, blue mussels, scallops, hard shell clam, and manila clams. The preliminary results of this analysis show that damages to commercial shellfishery from Green Crab predation are on average $22.6 million per year on the East Coast of the United States. Although the current damages on the West Coast are negligible, the potential future damages are likely to increase to $0.84 million per year, if Green Crab invades Puget Sound (WA) and Alaska.
Silicates in Ultra-Luminous Infrared Galaxies
Creators: name: Sirocky, M. M.
name: Levenson, N. A.
name: Elitzur, M.
name: Spoon, H. W. W.
name: Armus, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze the mid-infrared (MIR) spectra of ultraluminous infrared galaxies (ULIRGs) observed with the Spitzer Space Telescope's Infrared Spectrograph. Dust emission dominates the MIR spectra of ULIRGs, and the reprocessed radiation that emerges is independent of the underlying heating spectrum. Instead, the resulting emission depends sensitively on the geometric distribution of the dust, which we diagnose with comparisons of numerical simulations of radiative transfer. Quantifying the silicate emission and absorption features that appear near 10 and 18um requires a reliable determination of the continuum, and we demonstrate that including a measurement of the continuum at intermediate wavelength (between the features) produces accurate results at all optical depths. With high-quality spectra, we successfully use the silicate features to constrain the dust chemistry. The observations of the ULIRGs and local sightlines require dust that has a relatively high 18/10um absorption ratio of the silicate features (around 0.5). Specifically, the cold dust of Ossenkopf et al. (1992) is consistent with the observations, while other dust models are not. We use the silicate feature strengths to identify two families of ULIRGs, in which the dust distributions are fundamentally different. Optical spectral classifications are related to these families. In ULIRGs that harbor an active galactic nucleus, the spectrally broad lines are detected only when the nuclear surroundings are clumpy. In contrast, the sources of lower ionization optical spectra are deeply embedded in smooth distributions of optically thick dust.
description: 38 pages, 11 figures; to appear in ApJ v679 (May 20)
Scalarization-like mechanism through spacetime anisotropic scaling symmetry
Creators: name: Herrera-Aguilar, Alfredo
name: Higuita-Borja, Daniel F.
name: Méndez-Zavaleta, Julio A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a new family of exact black hole configurations, which is a solution to a generalized Einstein-Maxwell-Dilaton setup in arbitrary dimension. These solutions are asymptotically Lifshitz for any dynamical critical exponent $z\geq 1$. It turns out that the existence of a nontrivial scalar field is a direct consequence of breaking the spacetime isotropic scaling symmetry. This black hole family accepts various interesting limits that link it to well-known solutions in both the isotropic and anisotropic cases. We study the thermodynamics of these field configurations showing that the first law is satisfied and providing the corresponding Smarr formula, both of these relations account for an electric contribution. Furthermore, we show that for a certain parameter region, the anisotropic field configuration with a nonzero scalar field is thermodynamically preferred. This observation, together with a direct verification of the so-called scalarization conditions, suggest that the emergence of the dilaton field is due to a mechanism similar to spontaneous scalarization.
description: 22 pages, 3 figures, Journal version
Новгородский архиепископ Иона и род Медоварцевых
Creators: name: Геров Георги Петров
Publisher: name: Вестник сектора древнерусского искусства
Year: 2020
Subjects: Архиепископ Иона
Новгород
Отенский монастырь
ктиторский портрет
фрески
рукопись
лицевое шитье

description: Статья посвящена отношениям новгородского архиепископа Ионы с семьей Медоварцевых. Сопоставление рассказа о детстве Ионы с летописными данными позволяет установить, что его отцом является умерший в 1410 г. новгородский посадник Юрий Дмитриевич. Подчеркивается роль Юрия и Якова Дмитриевичей в строительстве и посвящении церкви Чуда архангела Михаила в Хонех Аркажского монастыря и забота архиепископа Ионы о прославлении храма. Уточняется, какого возраста достиг Иона к моменту кончины, и его изображения рассматриваются в свете этой информации. Анализируются также некоторые особенности рассказа о детстве Ионы в Медоварцевском летописце.
LINGUISTIC REPRESENTATION OF THE EFFECTIVENESS OF THE 'NEW SINCERITY AND IMPRESSIVENESS' IN THE MEDIA FIELD
Creators: name: Ro'zmatova, Muxlisa
Publisher: name: Zenodo
Year: 2024

description: The rise of 'New Sincerity' in the media reflects a significant shift in communicative strategies, emphasizing authenticity and emotional engagement over conventional persuasion techniques. This article explores the linguistic mechanisms that represent and enhance the effectiveness of 'New Sincerity' and its impressiveness in contemporary media. By examining media texts and discourse, this study identifies key linguistic features such as emotional appeal, transparency, and conversational tone that resonate with audiences. Additionally, the article will analyze examples from both global and Uzbek media to highlight cross-cultural dimensions of this phenomenon. The findings aim to contribute to the broader understanding of media rhetoric and its evolving role in shaping public perception.
Preparing the COROT space mission: new variable stars in the galactic Anticenter direction
Creators: name: Poretti, E.
name: Alonso, R.
name: Amado, P. J.
name: Belmonte, J. A.
name: Garrido, R.
name: Martin-Ruiz, S.
name: Uytterhoeven, K.
name: Catala, C.
name: Lebreton, Y.
name: Michel, E.
name: Suarez, J. C.
name: Aerts, C.
name: Creevey, O.
name: Goupil, M. J.
name: Mantegazza, L.
name: Mathias, P.
name: Rainer, M.
name: Weiss, W. W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The activities related to the preparation of the asteroseismic, photometric space mission COROT are described. Photoelectric observations, wide--field CCD photometry, uvbyB calibrations and further time--series have been obtained at different observatories and telescopes. They have been planned to complete the COROT programme in the direction of the galactic Anticenter. In addition to suitable asteroseismic targets covering the different evolutionary stages between ZAMS and TAMS, we discovered several other variable stars, both pulsating and geometrical. We compared results on the incidence of variability in the galactic Center and Anticenter directions. Physical parameters have been obtained and evolutionary tracks fitting them have been calculated. The peculiarities of some individual stars alre pointed out. Paper based on observations collected at the San Pedro Martir, Sierra Nevada, Teide, La Silla, Haute-Provence and Roque de Los Muchachos (Telescopio Nazionale Galileo and Mercator telescopes) observatories.
description: 13 pages, 9 figures. Accepted for The Astronomical Journal (2005 May volume)