cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Marketing-együttműködések az agrárgazdaságban és az élelmiszeriparban, közösségi marketing a versenyképesség erősítésében
Creators: name: Totth, Gedeon
name: Totth, Gedeon
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Marketing
subject: FOS: Economics and business
subject: marketingszervezetek
subject: ágazati marketing
subject: marketing organisations
subject: sectorial marketing

description: Az agrárgazdaság számos jellemzője, valamint az ágazatra általánosságban jellemző alacsony marketingkultúra és marketinggyakorlat, a marketingvégzés funkcionális, de különösképpen a nagyságrendi feltételeinek hiánya a marketing-együttműködés speciális formáját, egyfajta közös, mezomarketing alkalmazását teszi szükségessé. A közösségi marketing legfontosabb céljai az imázsépítés, a hazai termelők és termékek bel- és külföldi ismertségének erősítése, a piaci megjelenés elősegítése, a termelők piac- és fogyasztóismeretének növelése, az ágazati marketingorientáció erősítése és a hatékony márkaépítés. A fejlett agrárgazdasággal és élelmiszeriparral rendelkező európai országokban jelentős hagyományai vannak az ágazati közösségi mezomarketingnek, gyakorlatuk Magyarországon is kellő például szolgálhat. -----Several characteristics of agriculture and its poor marketing culture and practices, the lack of the functional conditions, especially the lack of the scaling conditions inherent to marketing performance, make the use of a particular form of marketing cooperation, a kind of a joint, meso marketing, necessary. The most important goals of the social marketing activities are the image building, the strengthening of the domestic and foreign publicity of domestic farms and their products, fostering the market entrée and presence, augmenting the knowledge of the producers in terms of the market and the consumer, enhancing departmental marketing orientation and efficient branding. Certain European countries, which have an advanced agriculture and food industry, have long-established traditions of the departmental social meso marketing. This fact should be a much-quoted example for domestic agriculture as well.
Mögliche Auswirkungen eines Brexit auf den deutschen Agrarhandel
Creators: name: Banse, Martin
name: Freund, Florian
name: Banse, Martin
name: Freund, Florian
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agricultural and Food Policy
subject: International Relations/Trade
subject: Agricultural and Food Policy

description: Zusammenfassung Als Folge des Brexit steht eine Neuausrichtung der Handelsbeziehungen zwischen dem Vereinigten Königreich mit der Europäischen Union ganz oben auf der politischen Agenda der britischen Regierung. Hiervon wären insbesondere auch die deutschen Agrar - und Nahrungsmittelmärkte betroffen, für die das Vereinigte Königreich (VK) einen bedeutsamen Handelspartner darstellt. Um die möglichen Auswirkungen eines Brexit auf die deutsc he Agrar - und Nahrungsmittelindustrie abzuschätzen, wurde in dieser Studie mit einem Handelsmodell ein ,,Extremszenario‘‘ berechnet, bei dem sowohl das VK als auch die EU MFN -Zölle auf ihre jeweiligen Importgüter erheben. Dies hätte zur Folge, dass zwische n der EU und dem VK in etwa die gleichen Zölle herrschen würden, wie derzeit beispielsweise zwischen USA und China. Die Ergebnisse zeigen, dass sich der Agrarhandelsüberschuss mit dem Vereinigten Königreich in diesem Szenario um 700 Mio. € verringern würde . Legt man den Fokus auf einzelne Güter - gruppen, wird deutlich, dass die heimische Schweine - und Geflügelfleisch- sowie die Milch - industrie zusammen mit den vorgelagerten Lieferbereichen am stärksten von einem Brexit betroffen wären. Durch den Rückgang der Handelsmengen bedingt, sinkt der Produktionswert von Schweine - und Geflügelfleisch um über 2 % und der von Milchprodukten um über 1 %. Abstract In the wake of Brexit the readjustment of the British trade relations with the rest of the EU is of high priori ty to the British government led by Theresa May. Being an important trading partner for agri- food products, Germany would by highly impacted by a Brexit. To investigate the possible impact of a Brexit on the German agri- food sectors we employ a computable general equilibrium model and assume the reciprocal implementation of MFN tariffs by the EU and the UK as an extreme scenario. This implies that UK and EU would charge the same tariffs on each others’ imports as it is the case for trade between US and Chin a. The results indicate a reduction in the German trade surplus of agri- food products with the UK of about 700 Mio. €. Looking at the different sectors it becomes clear that the local pig and poultry as well as the milk industry are harmed most by a Brexit . The reduction in trade value causes a decrease in production value of more than 2 % of pig and poultry meat and of 1 % for dairy products.
Abelian surfaces of GL2-type as Jacobians of curves
Creators: name: Gonzalez, Josep
name: Guardia, Jordi
name: Rotger, Victor
Publisher: name: arXiv
Year: 2004
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11G10; 11G18; 14H40

description: We study the set of isomorphism classes of principal polarizations on abelian varieties of GL2-type. As applications of our results, we construct examples of curves C, C'/\Q of genus two which are nonisomorphic over \bar \Q and share isomorphic unpolarized modular Jacobian varieties over \Q ; we also show a method to obtain genus two curves over \Q whose Jacobian varieties are isomorphic to Weil's restriction of quadratic \Q-curves, and present examples.
description: To appear in Acta Arithmetica
Higher Loop Results for the Plaquette, Using the Clover and Overlap Actions
Creators: name: Athenodorou, A.
name: Panagopoulos, H.
name: Tsapalis, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We calculate the perturbative value of the free energy in QCD on the lattice. This quantity is directly related to the average plaquette. Our calculation is done to 3 loops using the clover action for fermions; the results are presented for arbitrary values of the clover coefficient, and for a wide range of fermion masses. In addition, we calculate the 2 loop result for the same quantity, using the overlap action.
description: 3 pages, 1 figure. Presented at Lattice2004(improved)
Struktura społeczno-zawodowa ludności wiejskiej w Polsce i jej przestrzenne zróżnicowanie
Socio-Professional Structure of Rural Population in Poland and Its Spatial Variations
Creators: name: Halamska, Maria
name: Halamska, Maria
Publisher: name: Unknown
Year: 2016
Subjects: subject: Community/Rural/Urban Development
subject: Labor and Human Capital
subject: social structure
subject: deagrarization
subject: proletarization
subject: gentrification
subject: geographic variation

description: Based on the results of systematic „Social Diagnosis” surveys, the Author presents the socio-professional structure of rural population in Poland and its spatial variations. The structure was subject to dramatic changes during the last 25 years and the change sequences were influenced by three simultaneous processes: de-agrarization, proletarization and gentrification. Structural variations are shown based on three cross-sectional analyses: first – across four historical regions (corresponding to the former partitions of Poland), then – in division into 16 voivodeships and finally across four ‘functional’ areas formed by the type of local economy.
Światowe porozumienie klimatyczne a rozwój obszarów wiejskich
Global Climate Agreement and Rural Development
Creators: name: Bańkowska, Katarzyna
name: Bańkowska, Katarzyna
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agricultural and Food Policy
subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: The UN Framework Convention on Climate Change
subject: COP21
subject: Common Agricultural Policy
subject: climate change initiatives
subject: energy and climate policy

description: The increasing frequency of extreme weather anomalies is an impulse to further debate on how to adapt the economy and society to the impacts of climate change. The objective of this article is to present the global climate policy framework and related chal lenges for rural development. The article discusses documents which contain the results of negotiations carried out during Climate Summits held in the period 1992–2015. Socio-economic background of the climate agreements was characterized based on the data of the World Bank, Eurostat and Central Statistical Office (GUS). An analysis of literature together with the Authors’ expertise were the sources of arguments regarding the future of rural areas in the reality of the global climate policy tightening.
Quantum Stability of Generalized Proca Theories
Creators: name: Heisenberg, Lavinia
name: Zosso, Jann
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 establish radiative stability of generalized Proca effective field theories. While standard powercounting arguments would conclude otherwise, we find non-trivial cancellations of leading order corrections by explicit computation of divergent one-loop diagrams up to four-point. These results are crosschecked against an effective action based generalized Schwinger-DeWitt method. Further, the cancellations are understood as coming from the specific structure of the theory through a decoupling limit analysis which at the same time allows for an extension of the results to higher orders.
Active Reward Learning for Co-Robotic Vision Based Exploration in Bandwidth Limited Environments
Creators: name: Jamieson, Stewart
name: How, Jonathan P.
name: Girdhar, Yogesh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: We present a novel POMDP problem formulation for a robot that must autonomously decide where to go to collect new and scientifically relevant images given a limited ability to communicate with its human operator. From this formulation we derive constraints and design principles for the observation model, reward model, and communication strategy of such a robot, exploring techniques to deal with the very high-dimensional observation space and scarcity of relevant training data. We introduce a novel active reward learning strategy based on making queries to help the robot minimize path "regret" online, and evaluate it for suitability in autonomous visual exploration through simulations. We demonstrate that, in some bandwidth-limited environments, this novel regret-based criterion enables the robotic explorer to collect up to 17% more reward per mission than the next-best criterion.
description: 7 pages, 4 figures; accepted for presentation in IEEE Int. Conf. on Robotics and Automation, ICRA '20, Paris, France, June 2020
On rational approximation of algebraic functions
Creators: name: Borcea, Julius
name: Bögvad, Rikard
name: Shapiro, Boris
Publisher: name: arXiv
Year: 2004
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 30E10; Secondary 41A20, 41A21, 41A25, 42C05, 82B05

description: We construct a new scheme of approximation of any multivalued algebraic function $f(z)$ by a sequence $\{r_{n}(z)\}_{n\in \mathbb{N}}$ of rational functions. The latter sequence is generated by a recurrence relation which is completely determined by the algebraic equation satisfied by $f(z)$. Compared to the usual Padé approximation our scheme has a number of advantages, such as simple computational procedures that allow us to prove natural analogs of the Padé Conjecture and Nuttall's Conjecture for the sequence $\{r_{n}(z)\}_{n\in \mathbb{N}}$ in the complement $\mathbb{CP}^1\setminus \D_{f}$, where $\D_{f}$ is the union of a finite number of segments of real algebraic curves and finitely many isolated points. In particular, our construction makes it possible to control the behavior of spurious poles and to describe the asymptotic ratio distribution of the family $\{r_{n}(z)\}_{n\in \mathbb{N}}$. As an application we settle the so-called 3-conjecture of Egecioglu {\em et al} dealing with a 4-term recursion related to a polynomial Riemann Hypothesis.
description: 25 pages, 8 figures, LaTeX2e, revised version to appear in Advances in Mathematics
La funzione di produttività di Sylos Labini tra mercato e territorio: un'analisi econometrica per le regioni italiane
Creators: name: Guarini, Giulio
Publisher: name: Moneta e Credito
Year: 2013
Subjects: subject: funzione produttiva, Sylos Labini, regioni italiane
subject: O14, R11

description: This study analyzes the labour productivity for the Italian regions estimating the Sylos Labini's function. In this function, in dynamic term, the labour productivity depends positively on market (Smith effect), on unit labour cost (organization's effect), on difference between wages and prices of machine (Ricardo effect) and past investments, while it depends negatively on current investments (disturbance effect). According to the estimates, for the Italian regions, these three effects are significant; moreover the dimension of these effects are conditioned by sector and territorial peculiarities. In particular, the Smith effect could be determined by the phenomenon of labour hoarding for which during recession entrepreneur prefers to reduce utilization of workers that fire them. Finally, the significance of investments could be caused by an important multicollinearity between present and past investments. JEL Codes: O14, R11
description: Moneta e Credito, V. 60, N. 238 (2007)
Effect of the Vacuum Energy Density on Graviton Propagation
Creators: name: Modanese, Giovanni
name: Fontana, Giorgio
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: It is known that the value L of the vacuum energy density affects the propagation equation for gravitons: A mass term appears in the propagation equation, such that m^2=-L. As a consequence, the polarization states of gravitons also change. This effect of the L-term has been confirmed by recent calculations in a curved background, which is the only proper setting, since solutions of the classical Einstein equations in the presence of a L-term represent a space with constant curvature. A real value for the mass (when L<0) will show up as a slight exponential damping in the gravitational potential, which is however strongly constrained by astronomical data. The consequences of an imaginary mass (for L>0) are still unclear; on general grounds, one can expect the onset of instabilities in this case. This is also confirmed by numerical simulations of quantum gravity which became recently available. These properties gain a special interest in consideration of the following. (1) The most recent cosmological data indicate that L is positive and of the order of 0.1 J/m^3. Is this value compatible with a stable propagation of gravitons? (2) The answer to the previous question lies perhaps in the scale dependence of the effective value of L. L may be negative at the small distance/large energy scale at which the quantum behavior of gravitational fields and waves becomes relevant. Furthermore, local contributions to the vacuum energy density (in superconductors in certain states, and in very strong static electromagnetic fields) can change locally the sign of L, and so affect locally the propagation and the properties of gravitons. The graviton wavefunction, for different values of the parameters, may be characterized by superluminal phase velocity or by unitarity only in imaginary valued time.
description: CP699, Space Technology and Applications International Forum-STAIF 2004, proceedings published by AIP and edited by M.S. El-Genk
Gospodarka niskoemisyjna – nowe wyzwanie dla gmin wiejskich
Low-Carbon Economy – A New Challenge for Rural Communes
Creators: name: Gradziuk, Barbara
name: Gradziuk, Piotr
name: Gradziuk, Barbara
name: Gradziuk, Piotr
Publisher: name: Unknown
Year: 2016
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: low-carbon economy plan
subject: low-carbon economy
subject: rural communes
subject: greenhouse gases
subject: renewable energy sources

description: The Authors present the results of research into the planned measures to reduce CO2 emissions by local communes. The research was conducted in 2015 in 12 rural communes located in Lubelskie voivodship, which have developed Low-Carbon Econo myPlans (LCEPs). According to the research, CO2 emissions (47%) in the analyzed communes came mainly from the consumption of liquid fuels in transport (mainly transit) as well as by tractors and self-propelled agricultural machinery. The remaining causes of the emissions (53%) included the use of fossil fuels such as coal (31%), natural gas and heating oil (2% as well as electricity (20%) generated outside the area of the communes concerned. Among many various possibilities for reducing CO2 emissions identified in LCEPs the most important will be the substitution of conventional energy sources with renewable ones, including mainly biomass and solar energy.
title: Investigations on biological ice nucleation concerning plant materials and structural polysaccharides
Creators: name: Bichler, Magdalena
Publisher: name: TU Wien
Year: 2015
Subjects: subject: ice nucleation
subject: biological substances
subject: structural polysaccharides

description: According to Huffman et al. (2013) a burst of biological ice nuclei (IN) can be found over woodlands during and after rain events. The origin of these particles can be e.g. bacteria (e.g. Pseudomonas syringae), fungi (e.g. Fusarium acuminatum spores), and (decayed) plant litter. B. Pummer et al. (2012) report that both pollen and pollen washing water from plants originating from the northern timberline show ice nucleation activity. These facts suggest that other parts of the plants might also act as IN due to their cold protection and cold tolerance mechanisms. Hence investigations were done concerning the ice nucleation activity of other biological materials. On the one hand, further parts of plants (mainly berries and berry juices) from the northern timberline were investigated. On the other hand, investigations were done on both water-interacting and structural polysaccharides, like pectin and chitin, as well as chemical modifications of these polysaccharides. Additionally, altering experiments were done for selected carbohydrate samples to see if treatment with ozone has any influence on the freezing properties of water. ATR-FTIR spectroscopy was done to see if the ozone treatment influences the freezing properties.
Switching of magnetization by non-linear resonance studied in single nanoparticles
Creators: name: Thirion, C.
name: Wernsdorfer, W.
name: Mailly, D.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Magnetization reversal in magnetic particles is one of the fundamental issues in magnetic data storage. Technological improvements require the understanding of dynamical magnetization reversal processes at nanosecond time scales. New strategies are needed to overcome current limitations. For example, the problem of thermal stability of the magnetization state (superparamagnetic limit) can be pushed down to smaller particle sizes by increasing the magnetic anisotropy. High fields are then needed to reverse the magnetization that are difficult to achieve in current devices. Here we propose a new method to overcome this limitation. A constant applied field, well below the switching field, combined with a radio-frequency (RF) field pulse can reverse the magnetization of a nanoparticle. The efficiency of this method is demonstrated on a 20 nm cobalt particle by using the micro-SQUID technique. Other applications of this method might be nucleation or depinning of domain walls.
description: 11 pages, 5 figures
Automotive Cybersecurity
Creators: name: Manikandan, Sri Hari
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 400203
subject: Automotive mechatronics and autonomous systems

description: This paper provides critical insights into the evolving landscape of automotive cybersecurity, highlighting vulnerabilities and offering practical solutions. Understanding these issues is essential for manufacturers, regulators, and consumers to ensure safety and protect against potential threats in connected vehicles.
Knowledge and Use of Contraceptives Among Students of Imo State University
Creators: name: Eberendu, I.F
name: Ogubuike, I.C
name: Obianozie, T.I
name: Chinedu-Eleonu
name: Ugwulor, L.O.
Publisher: name: gjrpublication
Year: 2024

description: Contraceptives are tools that are used, artificially or by other means, to stop pregnancy after sexual activity. The purpose of the study was to evaluate Imo State University students' awareness about and usage of contraceptives. Four goals were established in order to direct this investigation. For this study, a descriptive cross-sectional research design was chosen. Utilizing structured questionnaires, data was gathered. Surveys were disseminated and gathered for examination utilizing SPSS version 23, the statistical tool for social science. The analysis employed percentage, mean, and standard deviation. The results showed that 92.6% of students knew how to use contraceptives. When asked what considerations would encourage students to use contraceptives, 60.6% of them said that they would rather avoid getting pregnant. Sixty-one percent (61.1%) of those surveyed said they were concerned of the adverse effects when asked what would be the biggest obstacle to their ability to use contraceptives. It was suggested that birth control and family planning education for girls should receive more focus.
Composite Pressure Cell for Pulsed Magnets
Creators: name: Sun, Dan
name: Naud, Martin F.
name: Nguyen, Doan N
name: Betts, Jonathan B
name: Singleton, John
name: Balakirev, Fedor F
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Extreme pressures and high magnetic fields can affect materials in profound and fascinating ways. However, large pressures and fields are often mutually incompatible; the rapidly changing fields provided by pulsed magnets induce eddy currents in the metallic components used in conventional pressure cells, causing serious heating, forces and vibration. Here we report a diamond-anvil-cell made mainly out of insulating composites that minimizes inductive heating while retaining sufficient strength to apply pressures of up to 9 GPa. Any residual metallic components are made of low-conductivity metals and patterned to reduce eddy currents. The simple design enables rapid sample or pressure changes, desired by pulsed-magnetic-field-facility users. The pressure cell has been used in pulsed magnetic fields of up to 65 T with no noticeable heating at cryogenic temperatures. Several measurement techniques are possible inside the cell at temperatures as low as 500 mK.
Razionalità limitata, scelte di portafoglio e investimento azionario estero
Creators: name: Magi, Alessandro
Publisher: name: Moneta e Credito
Year: 2013
Subjects: subject: funzione di produttività, Sylos Labini, regioni italiane
subject: G11, G12, G15

description: I provide a plausible explanation of household equity holdings, in a framework where economic agents have behavioral preferences. Basically, we develop our analysis assuming the existence of boundedly rational economic agents. In that sense, I explicitly recall some Keynesian propositions: the analysis of Keynes' work reveals that his approach was quite consistent with and actually anticipated both Simon's conception of bounded rationality and recent work on cognitive psychology. The representative agent derives utility not only from consumption (standard models) but also from risky financial wealth fluctuations. Moreover, the investor frames the stock market risk narrowly and has loss averse preferences. I numerically solve a simple model of international portfolio choice for the foreign equity share, providing a possible explanation for the equity home bias puzzle. Only economic agents able to process correctly information deriving from stock markets exploit the diversification opportunities provided by international financial markets. JEL Codes: G11, G12, G15
description: Moneta e Credito, V. 60, N. 238 (2007)
Satellite measurement of the Hannay angle
Creators: name: Spallicci, Alessandro D. A. M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The concept of a measurement of the yet unevaluated Hannay angle, by means of an Earth-bound satellite, adiabatically driven by the Moon, is shown herein. Numerical estimates are given for the angles, the orbital displacements, the shortening of the orbital periods, for different altitudes. It is concluded that the Hannay effect is measurable in high Earth orbits, by means of atomic clocks, accurate Time & Frequency transfer system and precise positioning.
description: Letter
Zróżnicowanie produktywności modeli gospodarstw rolnych w UE
Productivity Diversification by Farm Category in the European Union
Creators: name: Sadowski, Arkadiusz
name: Poczta, Walenty
name: Beba, Patrycja
name: Szuba-Barańska, Ewelina
name: Sadowski, Arkadiusz
name: Poczta, Walenty
name: Beba, Patrycja
name: Szuba-Barańska, Ewelina
Publisher: name: Unknown
Year: 2016
Subjects: subject: Productivity Analysis
subject: agriculture
subject: farm categories
subject: the European Union
subject: productivity of land and labour

description: The aim of the article was to define economic efficiency and productivity of soil and labor in the family farms, small scale farms and large scale farms in the European Union Member States. Farm categorization was based on the two main criteria such as structure of family labour force in relation to total labour and on the relation of agriculture income to minimum wage. A farm was regarded as a family farm if the work input made by the family living on a farm exceeded 50% of the total work input calculated as AWU, and income generated per 1 person exceeded the minimum wage. Farms featuring a predominance of hired labour over family labour were considered large scale farms. Other farms were classified as small scale farms. Results of the analysis of the different types of farms depended directly on their category. In large scale farms labour efficiency is typically several times greater than in small scale farms and in family farms. In many countries large scale farms also feature higher soil productivity. According to the analysis, economic efficiency as well as soil and labour productivity were the highest in the Benelux, followed by Germany, Denmark and Sweden. The worst results in the EU were recorded by farms in Romania, Bulgaria and Lithuania.
The field of moduli of quaternionic multiplication on abelian varieties
Creators: name: Rotger, Victor
Publisher: name: arXiv
Year: 2004
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11G18; 14G35

description: We consider principally polarized abelian varieties with quaternionic multiplication over number fields and we study the field of moduli of their endomorphisms in relation to the set of rational points on suitable Shimura varieties.
description: This version corrects Proposition 4.2 and some misprints in section 4 that appeared in the published version
On quantum symmetries of the non--ADE graph F4
Creators: name: Coquereaux, Robert
name: Isasi, Esteban
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We describe quantum symmetries associated with the F4 Dynkin diagram. Our study stems from an analysis of the (Ocneanu) modular splitting equation applied to a partition function which is invariant under a particular congruence subgroup of the modular group.
description: Modifications : we changed several notations and comments. This should improve the reading of the paper
title: Mobile Betriebssysteme und deren Einsatz im Mathematikunterricht
Creators: name: Pollak, Katrin
Publisher: name: TU Wien
Year: 2015
Subjects: subject: Mathematikunterricht
subject: Lernen
subject: Tablet
subject: Smartphone
subject: Hirnfunktion
subject: Neue Medien
subject: Mobile Betriebsysteme
subject: Alternative Unterrichtsmethoden
subject: maths class
subject: learning
subject: tablet
subject: smartphone
subject: brain function
subject: new media
subject: mobile operating systems
subject: alternative teaching methods

description: Diese Diplomarbeit beschäftigt sich mit der Untersuchung mobiler Betriebssysteme und deren Einsatz im Mathematikunterricht. Ziel ist eine Zusammenfassung aktueller Erkenntnisse bezüglich schulischer Verwendung von Smartphones bzw. Tablets. Dabei werden Themen zum Schwerpunkt "Lernen" behandelt. Um die aktuelle Situation im Klassenraum zu beurteilen, liefert der zweite Teil dieser Diplomarbeit Ergebnisse einer an einer Wiener HTL durchgeführten Umfrage. In dieser wurden Voraussetzungen, der persönliche Bezug zum Smartphone und mögliche Einsatzgebiete im schulischen Bereich erfragt. Im dritten Teil der Diplomarbeit wird ein Katalog mit Applikationen zu diversen mathematischen Themengebieten für die Verwendung im Unterricht vorgestellt.
description: This diploma thesis deals with the study of mobile operating systems and their use in mathematic lessons at school. The aim is to give a summary about actual insights referring to the use of smartphones or tablets in school. Therefore topics focused on "learning" are covered. To form an opinion about the situation in a classroom, the second part of this diploma thesis includes results of a survey, which was accomplished in a technical school in Vienna. The survey shows the qualifications, the personal connection to the smartphone and possible ways for the use in school. The third part of this diploma thesis includes a list of applications with different mathematical topics for the use in school lessons.
Revisiting the distance to the nearest UHECR source: Effects of extra-galactic magnetic fields
Creators: name: Lang, Rodrigo Guedes
name: Taylor, Andrew M.
name: Ahlers, Markus
name: de Souza, Vitor
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We update the constraints on the location of the nearest UHECR source. By analyzing recent data from the Pierre Auger Observatory using state-of-the-art CR propagation models, we reaffirm the need of local sources with a distance less than 25-100 Mpc, depending on mass composition. A new fast semi-analytical method for the propagation of UHECR in environments with turbulent magnetic fields is developed. The onset of an enhancement and a low-energy magnetic horizon of cosmic rays from sources located within a particular distance range is demonstrated. We investigate the distance to the nearest source, taking into account these magnetic field effects. The results obtained highlight the robustness of our constrained distances to the nearest source.
Kontekst innowacji w grupach producentów rolnych
Innovations in Agricultural Producer Groups
Creators: name: Domagalska-Grędys, Marta
name: Domagalska-Grędys, Marta
Publisher: name: Unknown
Year: 2016
Subjects: subject: Community/Rural/Urban Development
subject: Farm Management
subject: Production Economics
subject: open innovation
subject: innovation processes
subject: agricultural producer groups
subject: network farms
subject: intra and inter-organization relations
subject: the state of intra-group relations

description: The main objective of the study described in the article is to identify and evaluate the context of shaping innovation in agricultural producer groups. The groups were perceived as a starting point to establish a network of farms within which the emergence of open innovation would be favoured. The context of innovation in groups of farmers was referred to the classical stakeholder theory based on closed innovation (Joseph Shumpeter) and open innovation promoted in collaborative networks by contemporary theorists (Henry Chesbrough and Clayton Christiansen, Everett M. Rogers). A secondary objective of the study was to answer a question whether the state of intragroup relations was a prerequisite for enhancing innovation on farms, taking into account the change of relations between different profiles of production, indicators of group dynamics, assessment of relations with the cooperating institutions. The study was conducted in 2015 among groups of agricultural producers of the Lesser Poland (Małopolska) province, by applying the method of direct interview. The results show the greatest commitment to innovation in the horticultural groups if they feature stable (unchanging) intra-group relations, average group indicators and a large number of co operating institutions.
title: The urban heat island effect in courtyards : a microclimatic analysis of courtyards in Vienna
Creators: name: Glasberg, Laura
Publisher: name: TU Wien
Year: 2015
Subjects: subject: Urban Heat Islands
subject: Urban Climate
subject: Courtyards

description: The urban heat island phenomenon was proven to have negative economic and health consequences on urban populations and is hence one of the most important climatic issues to be dealt with in the 21st century. This paper aims at providing a microclimatic analysis of different courtyards in Vienna. The goal of this research is to analyze the thermal behavior of different courtyards and compare them to adjacent street canyons in terms of temperature, humidity, wind speed and CO2. Data was simultaneously recorded by mobile weather stations.
U.S. Agricultural Exports to China Increased Rapidly Making China the Number One Market
Creators: name: Hansen, James
name: Marchant, Mary A.
name: Tuan, Francis
name: Somwaru, Agapi
name: Hansen, James
name: Marchant, Mary A.
name: Tuan, Francis
name: Somwaru, Agapi
Publisher: name: Unknown
Year: 2017
Subjects: subject: Crop Production/Industries
subject: International Relations/Trade
subject: Livestock Production/Industries
subject: Agriculture imports
subject: China
subject: Grain
subject: Livestock
subject: Policy
subject: Trade,
subject: U.S. agriculture exports

description: U.S. agricultural commodity exports to China increased rapidly after China’s accession to the WTO in 2001. In 2012, China became the United States’ leading agricultural export market. Exports of consumer food products are rapidly increasing. Agricultural products not affected by China’s food security policies have succeeded with the fewest barriers to trade.
Long-term experimental warming effects on tundra plant sexual reproduction in the high Arctic
Creators: name: Klady, Rebecca A.
Publisher: name: University of British Columbia
Year: 2011

description: Predictions that climate warming will enhance plant sexual reproduction in the High Arctic were examined using a field experiment at a polar oasis and a polar semi-desert site in the eastern Canadian High Arctic. Small open top chambers (OTCs), which simulated climate warming, were established in plant communities along a soil moisture gradient in 1992. Over two growing seasons, fresh and over-wintered seeds across a range of species were collected from aerial seed banks exposed to experimental warming and ambient conditions. Seeds were weighed and germinated to measure changes in reproductive effort and success in response to experimental warming. OTCs increased within-plot growing season air temperatures by 1 - 2°C, which is within range of general circulation model (GCM) predictions for climate warming in the Arctic. Reproductive effort and success of fresh seeds were enhanced by warming in most species, depending on initial site conditions. Enhanced reproductive effort and success may be attributed to warming conditions, which advanced dates of snowmelt and extended the growing season. Similar effects on over-wintered seeds were likely, but seed dispersal prior to over-wintered seed harvests confounded these results. Inter-annual variability in reproductive success appeared to be diminished by experimental warming. Further testing will verify if this result is an indicator of long-term (> 10 y) warming effects. Results of this study confirm predictions that long-term warming will enhance sexual reproduction in high arctic plants. These changes will have implications for plant demographics at the community-level and the rate and extent of bare-ground colonization, particularly if rates of seedling establishment also increase.
Le determinanti del credito al consumo in Italia: il ruolo della grande distribuzione
Creators: name: Casolaro, Luca
Publisher: name: Moneta e Credito
Year: 2013
Subjects: subject: credito al consumo, Italia, grande distribuzione
subject: C23, D12, E51

description: Although consumer credit has grown very fast over the last decade, the dimension of the market is still small by international standards and its degree of development differs considerably across local markets. This paper presents an empirical analysis on the determinants of consumer credit based on data from the Italian provinces. The results show a positive correlation between the development of consumer credit and the diffusion of major retail outlets, that enlarge credit supply by offering systematic installment plans through consumer credit transactions, not available for smaller stores. JEL Codes: C23, D12, E51
description: Moneta e Credito, V. 60, N. 237 (2007)
Generalized hydrodynamics study of the one-dimensional Hubbard model: Stationary clogging and proportionality of spin, charge, and energy currents
Creators: name: Nozawa, Yuji
name: Tsunetsugu, Hirokazu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In our previous work [Y. Nozawa and H. Tsunetsugu, Phys. Rev. B 101, 035121 (2020)], we studied quench dynamics in the one-dimensional Hubbard model based on the generalized hydrodynamics theory for a partitioning protocol and showed the presence of a clogging phenomenon. Clogging is a phenomenon that vanishing charge current coexists with nonzero energy current, and was found when the protocol uses the initial condition that the left half of the system is prepared to be half filling at high temperatures with the right half being empty. Clogging occurs at all the sites in the left half and lasts for a time proportional to its distance from the connection point. In this paper, we use various different initial conditions and discuss two issues. The first issue is the possibility of clogging in a stationary state. When the electron density in the right half is initially set nonzero, we found that the left half-filled part expands for various sets of parameters in the initial condition. This means that the clogging phenomenon occurs at all the sites in the long-time stationary state, and we also discuss its origin. In addition, stationary clogging is accompanied by a back current, namely, particle density current flows towards the high-density region. We also found spin clogging occurs for some initial conditions, i.e., the vanishing spin current coexists with nonzero energy current. The second issue is the proportionality of spin and charge currents. We have found two spatio-temporal regions where the current ratio is fixed to a nonzero constant. We numerically studied how the current ratio depends on various initial conditions. We also studied the ratio of charge and energy currents.
description: 10 pages, 11 figures
Analysis of cooperativity and localization for atomic rearrangements
Creators: name: Trygubenko, Semen A.
name: Wales, David J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We propose new measures of localization and cooperativity for the analysis of atomic rearrangements. We show that for both clusters and bulk material cooperative rearrangements usually have significantly lower barriers than uncooperative ones, irrespective of the degree of localization. We also find that previous methods used to sample stationary points are biased towards rearrangements of particular types. Linear interpolation between local minima in double-ended transition state searches tends to produce cooperative rearrangements, while random perturbations of all the coordinates, as sometimes used in single-ended searches, has the opposite effect.
description: 38 pages, 10 figures, 1 table
Food Security in China from a Global Perspective
Creators: name: Zhong, Funing
name: Zhu, Jing
name: Zhong, Funing
name: Zhu, Jing
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Food Security and Poverty
subject: Food security
subject: China
subject: Farmer income
subject: Grain production
subject: Policy

description: Food security is a primary policy priority in China, and has traditionally been the focal point of policies regarding agricultural and rural development. Understanding the evolution of food security policy in China is the key to understanding its current and potential future role in world food markets.
Trasparenza economica e povertà
Creators: name: Ferreira De Mendonça, Helder
name: Simao Filho, José
Publisher: name: Moneta e Credito
Year: 2013
Subjects: subject: trasparenza economica, povertà
subject: I32, E52

description: Nowadays, with the diffusion of inflation targeting, the main instrument that central banks use to achieve final objectives in the implementation of monetary policy (concerning inflation and unemployment) is the interest rate. Furthermore, recent studies point out that central bank transparency contributes to reducing asymmetric information and price stability. As inflation, unemployment and interest rates are determinants of the level of poverty, the central bank's behaviour is relevant to its reduction. Accordingly, the present paper highlights the connection between economic transparency and poverty. The theoretical and empirical results denote that central bank transparency is a useful strategy in reducing income inequality and poverty. JEL Codes: I32, E52
description: Moneta e Credito, V. 60, N. 237 (2007)
title: Untersuchung des beweglichen Überfalls einer Schussrinne
Creators: name: Kibarov, Veselin
Publisher: name: TU Wien
Year: 2015
Subjects: subject: Schussrinne

description: Im Rahmen dieser Diplomarbeit wurde die wasserbauliche Gestaltung eines beweglichen Überfalls im Einlaufbauwerk einer Schußrinne untersucht, wobei besonderer Augemerk auf die Berechnung und Konstruktion gelegt wurde. Zuerst wird ein Überblick über die wichtigsten hydraulischen Bauwerke einer Hochwasserentlastung gegeben, danach werden verschiedene Typen von Überfallbauwerken und deren hydraulische Bemessung beschrieben. In Anschluss erfolgt eine detaillierte Behandlung von Verschlusskonstruktionen inklusive der statischen Berechnung. Diese wurde auch an Hand eines praktischen Beispieles durchgeführt und Entwurfspläne dafür entstellt.
description: In this thesis the hydraulic-constructive design of a gated spillway intake structure was examined, with particular focus to the hydraulics and construction. Introductionary is given an overview of the main hydraulic structures of the spillways, followed by various types of spillway structures and their hydraulic calculations. Next is presented a detailed description of the construction of gates including their static calculation. Finally a calculation of a practical example was performed with drawings.
Symbolic Pregression: Discovering Physical Laws from Distorted Video
Creators: name: Udrescu, Silviu-Marian
name: Tegmark, Max
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Computational Physics (physics.comp-ph)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We present a method for unsupervised learning of equations of motion for objects in raw and optionally distorted unlabeled video. We first train an autoencoder that maps each video frame into a low-dimensional latent space where the laws of motion are as simple as possible, by minimizing a combination of non-linearity, acceleration and prediction error. Differential equations describing the motion are then discovered using Pareto-optimal symbolic regression. We find that our pre-regression ("pregression") step is able to rediscover Cartesian coordinates of unlabeled moving objects even when the video is distorted by a generalized lens. Using intuition from multidimensional knot-theory, we find that the pregression step is facilitated by first adding extra latent space dimensions to avoid topological problems during training and then removing these extra dimensions via principal component analysis.
description: Expanded and improved physics discussion, additional method details. 9 pages, 7 figs
The WTO Dispute on China’s Agricultural Supports
Creators: name: Orden, David
name: Brink, Lars
name: Hejazi, Mina
name: Orden, David
name: Brink, Lars
name: Hejazi, Mina
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agricultural and Food Policy
subject: International Relations/Trade
subject: Agriculture
subject: China
subject: Domestic support
subject: U.S.-China dispute
subject: WTO

description: This article examines measurement of China’s market price support during 2012–15 under WTO rules and its relation to the gap between China’s domestic and international prices for wheat, corn and rice. It highlights issues that may arise in the recent U.S. complaint that China’s support exceeded its WTO commitments.
Spontaneous symmetry breaking and response functions
Creators: name: Beraudo, A.
name: De Pace, A.
name: Martini, M.
name: Molinari, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the quantum phase transition occurring in an infinite homogeneous system of spin 1/2 fermions in a non-relativistic context. As an example we consider neutrons interacting through a simple spin-spin Heisenberg force. The two critical values of the coupling strength -- signaling the onset into the system of a finite magnetization and of the total magnetization, respectively -- are found and their dependence upon the range of the interaction is explored. The spin response function of the system in the region where the spin-rotational symmetry is spontaneously broken is also studied. For a ferromagnetic interaction the spin response along the direction of the spontaneous magnetization occurs in the particle-hole continuum and displays, for not too large momentum transfers, two distinct peaks. The response along the direction orthogonal to the spontaneous magnetization displays instead, beyond a softened and depleted particle-hole continuum, a collective mode to be identified with a Goldstone boson of type II. Notably, the random phase approximation on a Hartree-Fock basis accounts for it, in particular for its quadratic -- close to the origin -- dispersion relation. It is shown that the Goldstone boson contributes to the saturation of the energy-weighted sum rule for ~25% when the system becomes fully magnetized (that is in correspondence of the upper critical value of the interaction strength) and continues to grow as the interaction strength increases.
description: 36 pages, 17 figures