cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effects of a flat rate introduction: shifts in farm activity and impact on farmers' income
Creators: name: Marchand, Fleur L.
name: Buysse, Jeroen
name: Campens, V.
name: Claeys, Dakerlia
name: Fernagut, Bruno
name: Lauwers, Ludwig H.
name: Van Der Straeten, Bart
name: Van Huylenbroeck, Guido
name: Marchand, Fleur L.
name: Buysse, Jeroen
name: Campens, V.
name: Claeys, Dakerlia
name: Fernagut, Bruno
name: Lauwers, Ludwig H.
name: Van Der Straeten, Bart
name: Van Huylenbroeck, Guido
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: Farm Management
subject: Research Methods/ Statistical Methods
subject: Positive Mathematical Programming
subject: farm model
subject: Common Agricultural Policy
subject: Payment Entitlements.

description: Current thoughts on CAP changes, e.g. the "Health Check", emphasize the necessity to move away from payments based on historical receipts towards a "flatter rate" system. The aim of current research is to simulate the impact of a flat rate system (equal payments per hectare of cultivated land) compared to the current historical system (payments based on individual historic entitlements). Impact on production and income of arable, dairy and cattle farms of two different flat rate scenario's, is assessed with a farm-based sector model for Flanders. The model maximizes income at farm level, calibrated to observed farming behavior in 2001-2003. Farm data can be selected by farm type, size and region, simulations could be run for specific sub sectors, size classes or regions. In the two simulated flat rate scenario's subsectors will gain subsidies at the expense of other subsectors. However, farms can compensate a substantial part of their income loss by changing activity choice.
Applying clock comparison methods to pulsar timing observations
Creators: name: Chen, Siyuan
name: Vernotte, Francois
name: Rubiola, Enrico
Publisher: name: arXiv
Year: 2020
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Frequency metrology outperforms any other branch of metrology in accuracy (parts in $10^{-16}$) and small fluctuations ($<10^{-17}$). In turn, among celestial bodies, the rotation speed of millisecond pulsars (MSP) is by far the most stable ($<10^{-18}$). Therefore, the precise measurement of the time of arrival (TOA) of pulsar signals is expected to disclose information about cosmological phenomena, and to enlarge our astrophysical knowledge. Related to this topic, Pulsar Timing Array (PTA) projects have been developed and operated for the last decades. The TOAs from a pulsar can be affected by local emission and environmental effects, in the direction of the propagation through the interstellar medium or universally by gravitational waves from super massive black hole binaries. These effects (signals) can manifest as a low-frequency fluctuation over time, phenomenologically similar to a red noise. While the remaining pulsar intrinsic and instrumental background (noise) are white. This article focuses on the frequency metrology of pulsars. From our standpoint, the pulsar is an accurate clock, to be measured simultaneously with several telescopes in order to reject the uncorrelated white noise. We apply the modern statistical methods of time-and-frequency metrology to simulated pulsar data, and we show the detection limit of the correlated red noise signal between telescopes.
description: 11 pages, 10 figures, 2 tables, 1 appendix
Thermodynamic properties of Fermi systems with flat single-particle spectra
Creators: name: Khodel, V. A.
name: Clark, J. W.
name: Zverev, M. V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The behavior of strongly correlated Fermi systems is investigated beyond the onset of a phase transition where the single-particle spectrum $ξ({\bf p})$ becomes flat. The Landau-Migdal quasiparticle picture is shown to remain applicable on the ordered side of this transition. Nevertheless, low-temperature properties evaluated within this picture show profound changes relative to results of Landau theory, as a direct consequence of the flattening of $ξ({\bf p})$. Stability conditions for this class of systems are examined, and the nature of antiferromagnetic quantum phase transitions is elucidated.
description: 5 pages, 5 figures
Curvature tensors of higher-spin gauge theories derived from general Lagrangian densities
Creators: name: Baker, Mark Robert
name: Bruce-Robertson, Julia
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Curvature tensors of higher-spin gauge theories have been known for some time. In the past, they were postulated using a generalization of the symmetry properties of the Riemann tensor (curl on each index of a totally symmetric rank-$n$ field for each spin-$n$). For this reason they are sometimes referred to as the generalized 'Riemann' tensors. In this article, a method for deriving these curvature tensors from first principles is presented; the derivation is completed without any a priori knowledge of the existence of the Riemann tensors or the curvature tensors of higher-spin gauge theories. To perform this derivation, a recently developed procedure for deriving exactly gauge invariant Lagrangian densities from quadratic combinations of $N$ order of derivatives and $M$ rank of tensor potential is applied to the $N = M = n$ case under the spin-$n$ gauge transformations. This procedure uniquely yields the Lagrangian for classical electrodynamics in the $N = M = 1$ case and the Lagrangian for higher derivative gravity (`Riemann' and `Ricci' squared terms) in the $N = M = 2$ case. It is proven here by direct calculation for the $N = M = 3$ case that the unique solution to this procedure is the spin-3 curvature tensor and its contractions. The spin-4 curvature tensor is also uniquely derived for the $N = M = 4$ case. In other words, it is proven here that, for the most general linear combination of scalars built from $N$ derivatives and $M$ rank of tensor potential, up to $N=M=4$, there exists a unique solution to the resulting system of linear equations as the contracted spin-$n$ curvature tensors. Conjectures regarding the solutions to the higher spin-$n$ $N = M = n$ are discussed.
description: 12 pages
Comment on ``Scientific collaboration networks. II. Shortest paths, weighted networks, and centrality"
Creators: name: Zhou, Tao
name: Liu, Jian-Guo
name: Wang, Bing-Hong
Publisher: name: arXiv
Year: 2005
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this comment, we investigate a common used algorithm proposed by Newman [M. E. J. Newman, Phys. Rev. E {\bf 64}, 016132(2001)] to calculate the betweenness centrality for all vertices. The inaccurateness of Newman's algorithm is pointed out and a corrected algorithm, also with O($MN$) time complexity, is given. In addition, the comparison of calculating results for these two algorithm aiming the protein interaction network of Yeast is shown.
description: 3 pages, 2 tables, and 2 figures
Imperfect competition in the fresh tomato industry
Creators: name: Hadj Djelloul, Mohammed
name: Requillart, Vincent
name: Simioni, Michel
name: Hadj Djelloul, Mohammed
name: Requillart, Vincent
name: Simioni, Michel
Publisher: name: Unknown
Year: 2008
Subjects: subject: Crop Production/Industries
subject: Demand and Price Analysis
subject: Marketing
subject: FOS: Economics and business
subject: Market power
subject: Imperfect competition
subject: Fresh products

description: In this paper, we analyse the market power of the retail industry in the French tomato market. Following the methods developed in the New Empirical Industrial Organization, we develop a structural model of this industry. The analysis is based on detailed data on final consumption and prices at both shipper and consumer levels for two types of tomatoes in France. The structural model is composed of a system of demand equation and supply equation. Supply equation includes a term that represents the market power of the retail sector. We use different models of demand in order to test the robustness of our results. We show that i) elasticity of demand varies during the year ii) the retail sector exercise only a "moderate" market power iii) the estimated mark-up of the retail sector varies from 0 to about 0.13 €/kg depending on the period iv) the mark-up is thus small (3% in average) as compared to the consumer price which is mainly explained by cost of production. We conclude to a moderate exercise of market power of the retail sector in this sector.
Casimir effect with rough metallic mirrors
Creators: name: Neto, Paulo A. Maia
name: Lambrecht, Astrid
name: Reynaud, Serge
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We calculate the second order roughness correction to the Casimir energy for two parallel metallic mirrors. Our results may also be applied to the plane-sphere geometry used in most experiments. The metallic mirrors are described by the plasma model, with arbitrary values for the plasma wavelength, the mirror separation and the roughness correlation length, with the roughness amplitude remaining the smallest length scale for perturbation theory to hold. From the analysis of the intracavity field fluctuations, we obtain the Casimir energy correction in terms of generalized reflection operators, which account for diffraction and polarization coupling in the scattering by the rough surfaces. We present simple analytical expressions for several limiting cases, as well as numerical results that allow for a reliable calculation of the roughness correction in real experiments. The correction is larger than the result of the Proximity Force Approximation, which is obtained from our theory as a limiting case (very smooth surfaces).
description: 16 pages
LEISTUNGSORIENTIERTE ENTLOHNUNG IN DER LANDWIRTSCHAFT - ERGEBNISSE EINER EMPIRISCHEN ANALYSE (German-
Creators: name: Von Davier, Zazie
name: Bahrs, Enno
name: Von Davier, Zazie
name: Bahrs, Enno
Publisher: name: Unknown
Year: 2007
Subjects: subject: Personal management
subject: Materielle Anreizsysteme
subject: Leistungsorientierte Entlohnung
subject: Betriebsleiterbefragung

description: Leistungslöhne als Motivationsinstrument sind hinsichtlich ihrer Wirksamkeit in der ökonomischen Theorie umstritten. Mit Hilfe einer schriftlichen Befragung von 260 landwirtschaftlichen Betriebsleitern werden die Erfahrungen mit leistungsorientierter Entlohnung in der Landwirtschaft untersucht. Die Auswertung zeigt, dass die Wahrscheinlichkeit der Erfahrung mit dieser Vergütungsform mit zunehmender Tierbestandesgröße steigt und mit größerer innerbetrieblicher Bedeutung des Ackerbaus sinkt. Mittels einer Clusteranalyse konnten drei Gruppen von Betriebsleiter ermittelt werden, die sich hinsichtlich ihrer Erfahrungen zu den Verhaltenswirkungen leistungsorientierter Vergütung unterscheiden.
Surface morphology dynamics in strained-layer epitaxy
Creators: name: Pinnington, Thomas Henry
Publisher: name: University of British Columbia
Year: 2009

description: The surface of a film grown epitaxially on a crystalline substrate is generally rough, even if the initial growth surface is smooth on the atomic scale. In the case of strained-layer epitaxy, in which the composition of the film is such that it does not share the same lattice constant as the substrate, the roughness often develops in response to strain-relief processes occurring in> the film during growth. In this thesis we show that a careful analysis of the time evolution of the surface morphology during strained-layer growth, can reveal quantitative information about both the strain-relief mechanisms acting within the film and the diffusion processes occurring at the surface. Two complementary measurement techniques, namely atomic force microscopy (AFM) and elastic light scattering, are used to acquire the surface morphology information necessary for the analysis. In this work we demonstrate quantitative agreement between roughness measurements obtained by both techniques. A major advantage of light scattering over AFM is its suitability to real-time monitoring of the surface during growth. We consider the growth of In0.18Ga0.82As and InAs, on (001)-oriented GaAs substrates, by molecular beam epitaxy (MBE). In both cases the film is compressively strained owing to the 7% lattice mismatch between InAs and GaAs. In the case of I n In0.18Ga0.82As growth, the strain is relieved plastically as the film thickness increases, through the introduction of misfit dislocations at the film/substrate interface. A characteristic Crosshatch pattern develops at the surface, consisting of ridges aligned along the (110) crystal directions. We present an analytical model to describe this roughening, in which the ridges arise from surface diffusion in response to the dislocation strain fields. Although it has only three fitting parameters, the model is able to reproduce both the time dependence and the length scale dependence of the surface morphology, as measured by light scattering and AFM. For the case of InAs growth on GaAs, the strain is relieved elastically through a morphological transition in which nearly identically-sized three-dimensional islands form, known in the literature as quantum dots. For typical growth conditions the islands are too small and closely spaced to be detected using visible wavelengths. An ultraviolet light scattering apparatus is described, which we show can detect the onset of quantum dot formation. The UV scattering signal increases linearly with time after the dots have formed, which we interpret as evidence that the dots are diffusing on the surface. During prolonged annealing we observe the emergence and growth of larger islands that initially consume material from the quantum dots and then compete with each other for material. The in situ light scattering measurements reveal that these processes are sensitively dependent on annealing temperature and arsenic overpressure.
Beyond Equi-joins: Ranking, Enumeration and Factorization
Creators: name: Tziavelis, Nikolaos
name: Gatterbauer, Wolfgang
name: Riedewald, Mirek
Publisher: name: arXiv
Year: 2021
Subjects: subject: Databases (cs.DB)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We study theta-joins in general and join predicates with conjunctions and disjunctions of inequalities in particular, focusing on ranked enumeration where the answers are returned incrementally in an order dictated by a given ranking function. Our approach achieves strong time and space complexity properties: with $n$ denoting the number of tuples in the database, we guarantee for acyclic full join queries with inequality conditions that for every value of $k$, the $k$ top-ranked answers are returned in $\mathcal{O}(n \operatorname{polylog} n + k \log k)$ time. This is within a polylogarithmic factor of $\mathcal{O}(n + k \log k)$, i.e., the best known complexity for equi-joins, and even of $\mathcal{O}(n+k)$, i.e., the time it takes to look at the input and return $k$ answers in any order. Our guarantees extend to join queries with selections and many types of projections (namely those called "free-connex" queries and those that use bag semantics). Remarkably, they hold even when the number of join results is $n^\ell$ for a join of $\ell$ relations. The key ingredient is a novel $\mathcal{O}(n \operatorname{polylog} n)$-size factorized representation of the query output, which is constructed on-the-fly for a given query and database. In addition to providing the first non-trivial theoretical guarantees beyond equi-joins, we show in an experimental study that our ranked-enumeration approach is also memory-efficient and fast in practice, beating the running time of state-of-the-art database systems by orders of magnitude.
description: 21 pages
Strongly Correlated Superconductivity rising from a Pseudo-gap Metal
Creators: name: Schiro', Marco
name: Capone, Massimo
name: Fabrizio, Michele
name: Castellani, Claudio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We solve by Dynamical Mean Field Theory a toy-model which has a phase diagram strikingly similar to that of high $T_c$ superconductors: a bell-shaped superconducting region adjacent the Mott insulator and a normal phase that evolves from a conventional Fermi liquid to a pseudogapped semi-metal as the Mott transition is approached. Guided by the physics of the impurity model that is self-consistently solved within Dynamical Mean Field Theory, we introduce an analytical ansatz to model the dynamical behavior across the various phases which fits very accurately the numerical data. The ansatz is based on the assumption that the wave-function renormalization, that is very severe especially in the pseudogap phase close to the Mott transition, is perfectly canceled by the vertex corrections in the Cooper pairing channel.A remarkable outcome is that a superconducting state can develop even from a pseudogapped normal state, in which there are no low-energy quasiparticles. The overall physical scenario that emerges, although unraveled in a specific model and in an infinite-coordination Bethe lattice, can be interpreted in terms of so general arguments to suggest that it can be realized in other correlated systems.
description: 14 pages, 11 figures
CHAIN QUALITY MANAGEMENT IN CO-OPERATIVES
Creators: name: Hanf, Jon Henrich
name: Pieniadz, Agata
name: Hanf, Jon Henrich
name: Pieniadz, Agata
Publisher: name: Unknown
Year: 2007
Subjects: subject: Institutional and Behavioral Economics
subject: Network theory
subject: Relationship management
subject: Quality management
subject: Cooperatives
subject: Poland

description: This paper investigates the relationship between the chosen quality strategy and the vertical co-ordination mechanism of a focal company by using new institutional economics, as well as strategic management approaches. The theoretical findings are tested using evidence from 19 of the largest Polish dairy cooperatives, surveyed in spring 2006. The results show that all co-ops recognise the changing market requirements and are treating food quality as more than plain food safety and the ability to continuously reproduce an ex ante defined set of attributes. However, compared to investor-owned dairies, co-ops are disadvantaged in quality-based competition due to their lower flexibility and access to financial and qualified human resources. To overcome this intense competition, co-ops modify their production profile, which leads to market segmentation. Moreover, the choice of quality strategy is an economic activity, guided by the co-op's profit expectations within the selected market. The chosen quality strategy determines the design of the vertical co-ordination mechanism. Thus, the higher the requirements for the final product, the further quality management systems go beyond a firm's boundaries, and the higher is the intensity of the relationships between the intermediary stages in the dairy chain.
MANAGEMENT OF PERCEIVED RISKS IN E-BUSINESS FOR EFFICIENT FOOD SUPPLY NETWORK MANAGEMENT: THE CASE OF TRUST
Creators: name: Fritz, Melanie
name: Canavari, Maurizio
name: Fritz, Melanie
name: Canavari, Maurizio
Publisher: name: Unknown
Year: 2007
Subjects: subject: Industrial Organization
subject: Supply chain management
subject: e-business
subject: transaction decisions
subject: trust
subject: analytic hierarchy process (AHP)

description: Vertical coordination in food networks is characterized by dynamically changing supply and marketing relationships. E-business provides support and improvement options for vertical coordination processes and flexible supply chain management in food networks. However, adoption of e-business in food networks is low as available e-business offers as the communication of safeguards for trust and control as basis for the transaction decision is not realized appropriately. This paper analyzes decision preferences for trust generation as basis for the design of e-business environments for supply chain management in food networks. The analytic hierarchy process is applied to prioritize preferences for different transaction scenarios in food networks.
Magnetic field generation from primordial black hole distributions
Creators: name: Araya, Ignacio J.
name: Rubio, Marcelo E.
name: Martin, Marco San
name: Stasyszyn, Federico A.
name: Padilla, Nelson D.
name: Magana, Juan
name: Sureda, Joaquin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We introduce a statistical method for estimating magnetic field fluctuations generated from primordial black hole (PBH) populations. To that end, we consider monochromatic and extended Press-Schechter PBH mass functions, such that each constituent is capable of producing its own magnetic field due to some given physical mechanism. Assuming linear correlation between magnetic field fluctuations and matter over-densities, our estimates depend on the mass function, the physical field generation mechanism by each PBH constituent, and the characteristic PBH separation. After computing the power spectrum of magnetic field fluctuations, we apply our formalism to study the plausibility that two particular field generation mechanisms could have given rise to the expected seed fields according to current observational constraints. The first mechanism is the Biermann battery and the second one is due to the accretion of magnetic monopoles at PBH formation, constituting magnetic PBHs. Our results show that, for monochromatic distributions, it does not seem to be possible to generate sufficiently intense seed fields in any of the two field generation mechanisms. For extended distributions, it is also not possible to generate the required seed field by only assuming a Biermann battery mechanism. In fact, we report an average seed field by this mechanism of about 10^{-47} G, at z = 20. For the case of magnetic monopoles we instead assume that the seed values from the literature are achieved and calculate the necessary number density of monopoles. In this case we obtain values that are below the upper limits from current constraints.
description: 15 pages, 5 figures, accepted for publication in MNRAS
DAS NACHFRAGEVERHALTEN BEI REGIONALEN SPEZIALITATEN: DAS BEISPIEL APFELWEIN IN HESSEN (German)
Creators: name: Kubitzki, Sabine
name: Schulz, Wiebke
name: Kubitzki, Sabine
name: Schulz, Wiebke
Publisher: name: Unknown
Year: 2007
Subjects: subject: Geschützte geographische Angabe
subject: Apfelwein
subject: Nachfrage
subject: Multinomiales Logit-Modell

description: Apfelwein ist eine regionale Spezialität aus Hessen und erfüllt wesentliche Eigenschaften eines Erzeugnisses, das für eine Registrierung als geschützte geographische Angabe nach VO (EWG) Nr. 2081/92 geeignet ist. Zur Untersuchung des Vermarktungspotentials wird eine epräsentativbefragung der hessischen Verbraucher durchgeführt. Mittels einer Faktorenanalyse werden fünf Einstellungsdimensionen ermittelt, die neben soziodemographischen Merkmalen und den Konsumverhalten bei alternativen Getränken als exogene Variablen in ein multinominales LOGIT-Modell eingeführt werden. Als wesentliche Determinanten der Nachfrage nach hessischen Apfelwein werden verschiedene Einstellungsfaktoren, das Konsumverhalten bei Bier und Weißwein, das Alter und der Wohnort innerhalb Hessens identifiziert. Der Einfluss des Alters ist nicht-linear und muss in Verbindung zur Lebenszeit in Hessen interpretiert werden. Generell ist die Verwendung eines Gütezeichens bei der Vermarktung empfehlenswert. Darüber hinaus ist eine Marktdifferenzierung vorzunehmen.
MOA-2009-BLG-319Lb: A Sub-Saturn Planet Inside the Predicted Mass Desert
Creators: name: Terry, Sean K.
name: Bhattacharya, Aparna
name: Bennett, David P.
name: Beaulieu, Jean-Phillipe
name: Koshimoto, Naoki
name: Blackman, Joshua W.
name: Bond, Ian A.
name: Cole, Andrew A.
name: Henderson, Calen B.
name: Lu, Jessica R.
name: Marquette, Jean Baptiste
name: Ranc, Clement
name: Vandorou, Aikaterini
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present an adaptive optics (AO) analysis of images from the Keck-II telescope NIRC2 instrument of the planetary microlensing event MOA-2009-BLG-319. The $\sim$10 year baseline between the event and the Keck observations allows the planetary host star to be detected at a separation of $66.5\pm 1.7\,$mas from the source star, consistent with the light curve model prediction. The combination of the host star brightness and light curve parameters yield host star and planet masses of M_host = 0.514 $\pm$ 0.063M_Sun and m_p = 66.0 $\pm$ 8.1M_Earth at a distance of $D_L = 7.0 \pm 0.7\,$kpc. The star-planet projected separation is $2.03 \pm 0.21\,$AU. The planet-star mass ratio of this system, $q = (3.857 \pm 0.029)\times 10^{-4}$, places it in the predicted "planet desert" at $10^{-4} < q < 4\times 10^{-4}$ according to the runaway gas accretion scenario of the core accretion theory. Seven of the 30 planets in the Suzuki et al. (2016) sample fall in this mass ratio range, and this is the third with a measured host mass. All three of these host stars have masses of 0.5 $\leq$ M_host/M_Sun $\leq$ 0.7, which implies that this predicted mass ratio gap is filled with planets that have host stars within a factor of two of 1M_Sun. This suggests that runaway gas accretion does not play a major role in determining giant planet masses for stars somewhat less massive than the Sun. Our analysis has been accomplished with a modified DAOPHOT code that has been designed to measure the brightness and positions of closely blended stars. This will aid in the development of the primary method that the Nancy Grace Roman Space Telescope mission will use to determine the masses of microlens planets and their hosts.
description: 16 pages, 6 figures, AJ in press
A Privacy Preserved and Cost Efficient Control Scheme for Coronavirus Outbreak Using Call Data Record and Contact Tracing
Creators: name: Nisar, Shibli
name: Zuhaib, Syed Muhammad Ali
name: Ulasyar, Abasin
name: Tariq, Muhammad
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Coronavirus or COVID-19, which has been declared pandemic by the World Health Organization, has incurred huge losses to the lives of people throughout the world. Although, the scientists, researchers and doctors are working round the clock to develop a vaccine for COVID-19, it may take a year or two to make a safe and effective vaccine available for the world. In current circumstances, a solution must be developed to control or stop the spread of the virus. For this purpose, a novel technique based on call data record analysis (CDRA)and contact tracing is proposed that can effectively control the coronavirus outbreak. A positive coronavirus patient can be traced through CDRA and contact tracing. The technique can track the path traversed by the patient and collect the cell numbers of all those people who have met with the patient. Keeping in tact the privacy of this group of people, who are contacted through their cell numbers so that they can isolate themselves till the result of their coronavirus test arrives. If a test result of a person comes positive among the group, then he/she must be isolated and same CDRA and contact tracing procedures are adopted for that person. A COVID-19 patient is geo tagged and alerts are sent if any violation of isolation is done by the patient. Moreover, the general public is informed in advance to avoid the path followed by the patients. This cost effective mechanism is not only capable to control the coronavirus outbreak but also helps in isolating the patient in his/her house.
EIN OKONOMISCHES AUKTIONSEXPERIMENT ZUR AUSWAHL DER TEILNEHMER AN UMWELTSCHUTZPROGRAMMEN (German)
Creators: name: Breustedt, Gunnar
name: Latacz-Lohmann, Uwe
name: Schilizzi, Steven
name: Breustedt, Gunnar
name: Latacz-Lohmann, Uwe
name: Schilizzi, Steven
Publisher: name: Unknown
Year: 2007
Subjects: subject: Auktion
subject: ökonomisches Experiment
subject: Umweltprogramm

description: Der vorliegende Artikel untersucht die Effizienz unterschiedlicher Ausgestaltungen von Auktionen zur Auswahl von Landwirten an Umweltprogrammen mittels eines ökonomischen Experimentes. Es wird eine Preisauktion, bei der die Leistung des Landwirts fixiert ist und er ein monetäres Mindestgebot für ein Teilnahmeentgelt abgeben soll, mit zwei unterschiedlichen Mengenauktionen verglichen, bei denen die Entgeltzahlung für den Landwirt fixiert ist und er aus unterschiedlichen Maßnahmen mit unterschiedlicher Leistung ein Angebotsbündel zusammenstellen soll. In der ersten Auktionsrunde ist die Leistung (=Stickstoffreduktion) je Euro Teilnahmeentgelt bei der Preisauktion signifikant höher als für die Mengenauktionen. Allerdings sind die Lerneffekte zwischen den Runden in der Preisauktion signifikant, so dass in der dritten Runde keine signifikanten Unterschiede zwischen den Auktionen mehr nachgewiesen werden können. Fur selten wiederkehrende, z.B. langfristige Nutzungsverpflichtungen in begrenzten Gebieten, bieten sich daher Preisauktionen an. Wenn der Programmanbieter z.B. wegen Akzeptanzproblemen für die wenig bekannten Mengenauktionen auch bei wiederholten Auktionen das Schema der Preisauktion wählte, sollte das Design der Auktion zumindest variiert werden, um den Lerneffekt zu begrenzen.
(3+1)-Formulation for Gravity with Torsion and Non-Metricity: The Stress-Energy-Momentum Equation
Creators: name: Ariwahjoedi, Seramika
name: Suroso, Agus
name: Zen, F. P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We derive the generalized Gauss-Codazzi-Mainardi (GCM) equation for a general affine connection with torsion and non-metricity. Moreover, we show that the metric compatibility and torsionless condition of a connection on a manifold are inherited to the connection of its hypersurface. As a physical application to these results, we derive the (3+1)-Einstein Field Equation (EFE) for a special case of Metric-Affine f(R)-gravity when f(R)=R, the Metric-Affine General Relativity (MAGR). Motivated by the concept of geometrodynamics, we introduce additional variables on the hypersurface as a consequence of non-vanishing torsion and non-metricity. With these additional variables, we show that for MAGR, the energy, momentum, and the stress-energy part of the EFE are dynamical, i.e., all of them contain the derivative of a quantity with respect to the time coordinate. For the Levi-Civita connection, one could recover the Hamiltonian and the momentum (diffeomorphism) constraint, and obtain the standard dynamics of GR.
description: 25 pages
Relativistic hydrodynamics with momentum dependent relaxation time
Creators: name: Mitra, Sukanya
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A second order relativistic hydrodynamic theory has been derived using momentum dependent relaxation time in the relativistic transport equation. In order to do that, an iterative technique of gradient expansion approach, namely Chapman-Enskog (CE) expansion of the particle distribution function has been employed. The key findings of this work are, (i) momentum dependent relaxation time in collision term results in an extended Landau matching condition for the thermodynamic variables, (ii) the result from numerical solution of Boltzmann equation lies somewhere in between the two popular extreme limits : linear and quadratic ansatz, indicating a fractional power of momentum dependence in relaxation time to be appropriate, (ii) an equivalence has been established between the iterative gradient expansion method like CE and the well known moment approach like Grad's 14-moment method.
description: Accepted for Physical Review C
THE LESSONS FROM THE DEVELOPMENT AND PROBLEMS OF PRODUCTION COOPERATIVE IN BULGARIAN AGRICULTURE
Creators: name: Doitchinova, Julia M.
name: Kanchev, Ivan
name: Miteva, Albena
name: Doitchinova, Julia M.
name: Kanchev, Ivan
name: Miteva, Albena
Publisher: name: Unknown
Year: 2007
Subjects: subject: Agribusiness
subject: agricultural cooperatives
subject: EU accession
subject: CAP implementation

description: In the paper are depicted the lessons and the problems of functioning and restructuring of cooperative structures in agricultural sector in Bulgaria during the pre-accession period (1995- 2006). The unsolved institutional and legislative problems of these structures are shown in details. The purpose of the paper is to analyze and assess the status of the cooperative structures active in the agriculture and to offer concrete suggestions for their further adaptation to the EU legislation implemented in this area.
Coupling between static friction force and torque for a tripod
Creators: name: Dahmen, Silvio R.
name: Hinrichsen, Haye
name: Lysov, Andrey
name: Wolf, Dietrich E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: If a body is resting on a flat surface, the maximal static friction force before motion sets in is reduced if an external torque is also applied. The coupling between the static friction force and static friction torque is nontrivial as our studies for a tripod lying on horizontal flat surface show. In this article we report on a series of experiments we performed on a tripod and compare these with analytical and numerical solutions. It turns out that the coupling between force and torque reveals information about the microscopic properties at the onset to sliding.
description: 7 pages, 4 figures, revtex
Profile likelihood analysis for a stochastic model of diffusion in heterogeneous media
Creators: name: Simpson, Matthew J
name: Browning, Alexander P
name: Drovandi, Christopher
name: Carr, Elliot J
name: Maclaren, Oliver J
name: Baker, Ruth E
Publisher: name: arXiv
Year: 2020
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences
subject: 92Bxx

description: We compute profile likelihoods for a stochastic model of diffusive transport motivated by experimental observations of heat conduction in layered skin tissues. This process is modelled as a random walk in a layered one-dimensional material, where each layer has a distinct particle hopping rate. Particles are released at some location, and the duration of time taken for each particle to reach an absorbing boundary is recorded. To explore whether this data can be used to identify the hopping rates in each layer, we compute various profile likelihoods using two methods: first, an exact likelihood is evaluated using a relatively expensive Markov chain approach; and, second we form an approximate likelihood by assuming the distribution of exit times is given by a Gamma distribution whose first two moments match the expected moments from the continuum limit description of the stochastic model. Using the exact and approximate likelihoods we construct various profile likelihoods for a range of problems. In cases where parameter values are not identifiable, we make progress by re-interpreting those data with a reduced model with a smaller number of layers.
description: 41 pages, 11 figures
REGALMIETEN UND DIE EFFIZIENZ VON ZULIEFERERVERTRAGEN (German)
Creators: name: Von Schlippenbach, Vanessa
name: Von Schlippenbach, Vanessa
Publisher: name: Unknown
Year: 2007
Subjects: subject: Listungsgebühren
subject: Vertikale Verträge
subject: Asymmetrische Information

description: Als wesentlicher Intermediär zwischen Konsumgüterindustrie und Verbrauchern entscheidet der Einzelhandel mit seiner Sortimentsgestaltung über den Marktzugang von Konsumgütern. Damit verfügt der Einzelhandel über eine Flaschenhalsfunktion, die ihm zentrale Marktmacht gegenüber seinen Zulieferern verleiht. Diese Position ermöglicht es dem Einzelhandel, von seinen Zulieferern Gebühren für den Marktzugang zu verlangen. So wird zunehmend beobachtet, dass Hersteller Regalmieten oder Listungsgebühren zahlen, um ihr Gut über den Einzelhandel absetzen zu können. In einem Prinzipal-Agenten-Modell, in dem der Zulieferer weder die Nachfrage auf Endverbrauchermärkten noch die Bemühungen des Agenten beobachten kann, zeigen wir, dass Regalmieten die Effizienz vertikaler Vertragsbeziehungen steigern können. Sie können insbesondere zu höheren Investitionen in die Nachfragesteigerung und damit schließlich auch zu einem Anstieg der sozialen Wohlfahrt führen.
The Alignment between the Distribution of Satellites and the Orientation of their Central Galaxy
Creators: name: Yang, Xiaohu
name: Bosch, Frank C. van den
name: Mo, H. J.
name: Mao, Shude
name: Kang, Xi
name: Weinmann, Simone M.
name: Guo, Yicheng
name: Jing, Y. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use galaxy groups selected from the Sloan Digital Sky Survey to examine the alignment between the orientation of the central galaxy (defined as the brightest group member) and the distribution of satellite galaxies. By construction, we therefore only address the alignment on scales smaller than the halo virial radius. We find a highly significant alignment of satellites with the major axis of their central galaxy. This is in qualitative agreement with the recent study of Brainerd (2005), but inconsistent with several previous studies who detected a preferential minor axis alignment. The alignment strength in our sample is strongest between red central galaxies and red satellites. On the contrary, the satellite distribution in systems with a blue central galaxy is consistent with isotropic. We also find that the alignment strength is stronger in more massive haloes and at smaller projected radii from the central galaxy. In addition, there is a weak indication that fainter (relative to the central galaxy) satellites are more strongly aligned. We present a detailed comparison with previous studies, and discuss the implications of our findings for galaxy formation.
description: 11 pages, 7 figures. Accepted for publication in MNRAS, 1 table (which lists the past attempts) added
Transcription of the narration of Reel #1 (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-190317-12: transcription of VP-180317-03 (narration of Reel #1 from the LA 256 collection at SCOIL, one of six reels of 8mm film created by Verdena in the 1960s, featuring scenes of everyday life around Hoopa Valley as well as Brush Dances). From 10:03 to end of file. Due to re-numbering, Reel #1 has been assigned the CLA item number LA 256.040.
FINANCIAL MARKET REACTIONS TO INTERNATIONAL MERGERS & ACQUISITIONS IN THE BREWING INDUSTRY: AN EVENT STUDY ANALYSIS
Creators: name: Heyder, Matthias
name: Ebneth, Oliver
name: Theuvsen, Ludwig
name: Heyder, Matthias
name: Ebneth, Oliver
name: Theuvsen, Ludwig
Publisher: name: Unknown
Year: 2008
Subjects: Agribusiness

description: Cross-border acquisitions have been the growing trend in recent years in the world brewing industry, giving brewers the opportunity to enhance their degree of internationalization and market share remarkably. This study employs event study analysis to examine 31 mergers and acquisitions among leading European brewing groups. Differences regarding financial market reactions can be determined within the European peer group. Managerial implications as well as future research propositions conclude this paper.
Local moments versus itinerant antiferromagnetism: magnetic phase diagram and spectral properties of the anisotropic square lattice Hubbard model
Creators: name: Raczkowski, Marcin
name: Assaad, Fakher F.
name: Imada, Masatoshi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using a cluster extension of the dynamical mean-field theory (CDMFT) we map out the magnetic phase diagram of the anisotropic square lattice Hubbard model with nearest-neighbor intrachain $t$ and interchain $t_{\perp}$ hopping amplitudes at half-filling. A fixed value of the next-nearest-neighbor hopping $t'=-t_{\perp}/2$ removes the nesting property of the Fermi surface and stabilizes a paramagnetic metal phase in the weak-coupling regime. In the isotropic and moderately anisotropic regions, a growing spin entropy in the metal phase is quenched out at a critical interaction strength by the onset of long-range antiferromagnetic (AF) order of preformed local moments. It gives rise to a first-order metal-insulator transition consistent with the Mott-Heisenberg picture. In contrast, a strongly anisotropic regime $t_{\perp}/t\lesssim 0.3$ displays a quantum critical behavior related to the continuous transition between an AF metal phase and the AF insulator. Hence, within the present framework of CDMFT, the opening of the charge gap is magnetically driven as advocated in the Slater picture. We also discuss how the lattice-anisotropy-induced evolution of the electronic structure on a metallic side of the phase diagram is tied to the emergence of quantum criticality.
description: 14 pages + 2 new appendices, 17 figures
title: Υλοποίηση ενός εκπαιδευτικού προσομοιωτή μνήμης cache για κινητά Android
title: Implementation of an educational cache simulator for Android mobiles
titleType: AlternativeTitle
Creators: name: Τσιαμπάς, Γιώργος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Επεξεργαστής
Κρυφή μνήμη
Προσομοιωτής κρυφής μνήμης

description: Το χάσμα μεταξύ των ταχυτήτων της μνήμης και του μικροεπεξεργαστή έχει ενθαρρύνει τους αρχιτέκτονες μικροεπεξεργαστών να παρέχουν μηχανισμούς στους οποίους θα “κρύβουν” τις μεγάλες καθυστερήσεις μνήμης. Οι κρυφές μνήμες (μνήμες cache) έχουν γίνει ο βασικός μηχανισμός που χρησιμοποιούν οι επεξεργαστές για την απόκρυψη αυτών των καθυστερήσεων και τη μείωση του μέσου χρόνου πρόσβασης στα δεδομένα. Οι κρυφές μνήμες αποτελούν ένα από τα βασικά θέματα σε όλα τα μαθήματα οργάνωσης και αρχιτεκτονικής υπολογιστών. Κατά συνέπεια, υπάρχουν αρκετές εκπαιδευτικές προτάσεις που αφορούν στην κατανόηση αυτού του θέματος. Αντικείμενο της παρούσας διπλωματικής εργασίας είναι να υλοποιήσουμε έναν προσομοιωτή κρυφής μνήμης που θα παρέχει ένα ελκυστικό και εύκολα κατανοητό εργαλείο στους φοιτητές στη μελέτη εννοιών που σχετίζονται με την κρυφή μνήμη. Για το σκοπό αυτό χρησιμοποιήσαμε τεχνολογίες όπως το android studio με το οποίο μπορούμε να δημιουργήσουμε μια εφαρμογή για κινητά που χρησιμοποιούν android.
OVI in Elliptical Galaxies: Indicators of Cooling Flows
Creators: name: Bregman, Joel N.
name: Miller, Eric D.
name: Athey, Alex E.
name: Irwin, Jimmy A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Early-type galaxies often contain a hot X-ray emitting interstellar medium (3-8E6 K) with an apparent radiative cooling time much less than a Hubble time. If unopposed by a heating mechanism, the gas will radiatively cool to temperatures <= 10E4 K at a rate proportional to L_X/T_X, typically 0.03-1 M_solar yr^-1. We can test if gas is cooling through the 3E5 K range by observing the OVI doublet, whose luminosity is proportional to the cooling rate. Here we report on a study of an unbiased sample of 24 galaxies, obtaining Far Ultraviolet Spectroscopic Explorer spectra to complement the X-ray data of ROSAT} and Chandra. The OVI line emission was detected in about 40% of the galaxies and at a luminosity level similar to the prediction from the cooling flow model. There is a correlation between Mdot_OVI and Mdot_X, although there is significant dispersion about the relationship, where the OVI is brighter or dimmer than expected by a factor of three or more. If the cooling flow picture is to be retained, this dispersion requires that cooling flows be time-dependent, as might occur by the activity of an AGN. However, of detected objects, those with the highest or lowest values of Mdot_OVI/Mdot_X are not systematically hot or cool, as one might predict from AGN heating.
description: 49 pages, 26 figures, ApJ, in press
พระภูมิพลมิ่งเกล้า หทัยไทย
Creators: name: สุปาณี พัดทอง
Publisher: name: คณะศิลปศาสตร์ มหาวิทยาลัยธรรมศาสตร์
Year: 2017
Subjects: -

description: วรรณวิทัศน์, 17, พฤศจิกายน, -
Interpretation of the Low-Frequency Peculiarities in the Radio Profile Structure of the Crab Pulsar
Creators: name: Petrova, S. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The theory of magnetized induced scattering off relativistic gyrating particles is developed. It is directly applicable to the magnetosphere of a pulsar, in which case the particles acquire gyration energies as a result of resonant absorption of radio emission. In the course of the radio beam scattering into background the scattered radiation concentrates along the ambient magnetic field. The scattering from different harmonics of the particle gyrofrequency takes place at different characteristic altitudes in the magnetosphere and, because of the rotational effect, gives rise to different components in the pulse profile. It is demonstrated that the induced scattering from the first harmonic into the state under the resonance can account for the so-called low-frequency component in the radio profile of the Crab pulsar. The precursor component is believed to result from the induced scattering between the two states well below the resonance. It is shown that these ideas are strongly supported by the polarization data observed. Based on an analysis of the fluctuation behaviour of the scattering efficiencies, the transient components of a similar nature are predicted for other pulsars.
description: 9 pages, no figures. Accepted for publication in MNRAS
DIMENSIONEN DER VERBRAUCHERRESONANZ BEI DER NEUPRODUKTBEURTEILUNG VON LEBENSMITTELN (German)
Creators: name: Sparke, Kai
name: Menrad, Klaus
name: Sparke, Kai
name: Menrad, Klaus
Publisher: name: Unknown
Year: 2007
Subjects: subject: Neuproduktbeurteilung
subject: Akzeptanzsimulator
subject: Produktakzeptanz

description: Verbrauchereinbindung in die Produktentwicklung und Zielgruppenmarktforschung erhöhen die Erfolgswahrscheinlichkeit neuer Produkte. Mit Hilfe der Conjointanalyse können Verbraucherpräferenzen gegenüber Produktalternativen ermittelt werden. Von Bedeutung ist aber für Lebensmittelhersteller auch die Frage, wie eine spezielle Produktkomponente von einer bestimmten Zielgruppe beurteilt wird. Für diese Absolutbetrachtung wurde ein Akzeptanzsimulator entwickelt und in Verbraucherbefragungen überprüft. Getestet wurden drei Lebensmittelproduktkonzepte bei insgesamt über 900 Verbrauchern. Es ergab sich ein weitgehend zwischen Präferenz und Akzeptanz kongruentes Bild der Verbraucherbeurteilung. Aus den Daten der Produktbeurteilungen verschiedener Lebensmittel lässt sich eine allgemeine Akzeptanzschwelle ableiten, über der Produktkomponenten liegen sollten, damit das spätere Produkt bei der ausgewählten Zielgruppe Erfolg hat.