cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quo Vadis CAP. Polish agriculture after accession
Creators: name: Klank, Leszek
name: Klank, Leszek
Publisher: name: Unknown
Year: 2007
Subjects: subject: Community/Rural/Urban Development
subject: Environmental Economics and Policy
subject: International Development
subject: CAP
subject: accession
subject: environment
subject: agricultural prices

description: In March 2007 the European Union celebrated 50th Anniversary of the Treaty of Rome announcement. Its integral part is Common Agricultural Policy. The objectives of the CAP deal with the farmer and the consumer i.e., the society at large. It was widely recognized that increase of productivity lead to diminishing workforce in agriculture and depopulation of rural areas. However, it was not recognized that it would lead to overproduction and environment damage, as well. Over the last fifty years the CAP objectives has significantly shifted from production to environment protection. Until accession the EU the environmental concerns related to agriculture had not played a significant role in any agricultural decision. Generally, the "quality" of natural environment is much higher in the new EU member states than in the old once. Still, agricultural production has a profound effect on the wider environment. Agriculture also affects the basis for its own future through land degradation, salinization, the over-extraction of water and reduction of genetic diversity in crops and livestock. The paradox is that the farmers are paid for keeping natural environment healthy. There is evidence that cost of such policy are in large extent covered by the EU new members. Agriculture is a very capital intensive and very costly industry. A modern farm requires a lot of fixed assets as, agricultural land, different kind of buildings and machinery. It is obvious than price change in arty of these factors has impact on cost of production. Polish accession to the European Union has had very strong influence especially on agricultural land prices and stagnation of farm restructuring.
The gravitational self-force
Creators: name: Poisson, Eric
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The self-force describes the effect of a particle's own gravitational field on its motion. While the motion is geodesic in the test-mass limit, it is accelerated to first order in the particle's mass. In this contribution I review the foundations of the self-force, and show how the motion of a small black hole can be determined by matched asymptotic expansions of a perturbed metric. I next consider the case of a point mass, and show that while the retarded field is singular on the world line, it can be unambiguously decomposed into a singular piece that exerts no force, and a smooth remainder that is responsible for the acceleration. I also describe the recent efforts, by a number of workers, to compute the self-force in the case of a small body moving in the field of a much more massive black hole. The motivation for this work is provided in part by the Laser Interferometer Space Antenna, which will be sensitive to low-frequency gravitational waves. Among the sources for this detector is the motion of small compact objects around massive (galactic) black holes. To calculate the waves emitted by such systems requires a detailed understanding of the motion, beyond the test-mass approximation.
description: 10 pages,2 postscript figures, revtex4. This article is based on a plenary lecture presented at GR17
Romania's agriculture before the accession
Creators: name: Dobrescu, Emilian
name: Dobrescu, Emilian
Publisher: name: Unknown
Year: 2007
Subjects: subject: Community/Rural/Urban Development
subject: Consumer/Household Economics
subject: International Development
subject: Romania's agriculture
subject: EU agriculture
subject: rural development
subject: Organic farming
subject: organic label

description: Romania cannot join the European Union with agricultural plots with sizes less than 1 hectare. The change of mentality is still difficult. In the rural areas there is already a tendency among people of not willing to get associated any more, people do not want production co-operatives any more, no more co-operative farms, everybody wants to farm his own piece of land! This mentality will be difficult to change; only the positive developments that may appear will change this situation. At more than 15 years after the communist period, agriculture is affected by chronic inefficiency, and most peasants farm their land with horse-drawn ploughs. The high costs, caused by the lack of technology and agricultural landfragmentation, led to domestic prices that exceed the world prices by about 40 euro/ton of product, which significantly influence the export activity.
Three-flavor analysis of long-baseline experiments
Creators: name: Winter, Walter
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compare the analysis of existing and future neutrino oscillation long-baseline experiments, where we point out that the analysis of future experiments actually implies a 12-dimensional parameter space. Within the three-flavor neutrino oscillation framework, six of these parameters are the fit parameters, and six are the simulated parameters. This high-dimensional parameter space requires the condensation of information and the definition of performance indicators for the purpose needed. As the most sophisticated example for such an indicator, we choose the precision of the leptonic CP phase, and discuss some of the complications of its computation and interpretation.
description: Talk given at the 6th International Workshop on Neutrino Factories & Superbeams, July 26-Aug 1, 2004, Osaka, Japan. 3 pages
Staying power : George Lincoln Rockwell’s legacy
Creators: name: Maschmann, Sean
Publisher: name: University of British Columbia
Year: 2010

description: This paper is an examination of the ideas of George Lincoln Rockwell, the leader of the American Nazi Party from its inception until Rockwell's assassination at the end of the 1960's. Using Rockwell's two major ideological statements - This Time the World (1961) and the subsequent White Power (1968) —this paper traces a fundamental change in Rockwell's thinking which was tied to popular conceptions of race in the United States after the Second World War. Historically, the idea of "whiteness" in American popular imagination was closely linked to being of northern European heritage. Southern Europeans, Catholics and other non-Nordic European Americans were traditionally the object of organized racism in the United States, exemplified by the Protestant Ku Klux Klan. However, as the twentieth century entered its second half, the idea of "whiteness" grew to include all Americans of European and Jewish origin to the extent that such divisions were no longer so meaningful as divisions between "whites" and visible minorities. In the early years of the American Nazi Party, Rockwell believed, like his idol Adolf Hitler, that northern Europeans were the apex of human social, biological and cultural development. In This Time the World, Rockwell again and again expounds on the supposed virtues of the "master race" of fair-skinned and blonde-haired "Nordics." However, given the changing popular perception of "whiteness," Rockwell was out of step with mainstream ideas. By the time he wrote White Power, Rockwell had undergone a radical transformation in his thinking. Inspired directly by the growing Black Power movement, whose radicalism and racially separatist ideas he strongly admired, Rockwell attempted to fashion his racist organization along similar lines. Though the American Nazi Party never had a significant following at any time, Rockwell's importance in the history of radical racism comes from his appropriation of a central feature of radical black nationalism - the idea that all Europeans constitute a "family." Just as differences between African Americans - skin tone in particular - were downplayed in the name of unity by groups such as the Nation of Islam, Rockwell underscored "white" racial unity, and ended his fixation with "Nordic" white superiority. Rockwell was responding both to popular ideas of "whiteness" and also to militant African-American leaders who preached racial unity. His idea of white racial unity remains a cornerstone of the American racist movement as a whole, and has allowed it to grow beyond its narrowly "Nordic" and Protestant origins.
A deep neural network for molecular wave functions in quasi-atomic minimal basis representation
Creators: name: Gastegger, M.
name: McSloy, A.
name: Luya, M.
name: Schütt, K. T.
name: Maurer, R. J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The emergence of machine learning methods in quantum chemistry provides new methods to revisit an old problem: Can the predictive accuracy of electronic structure calculations be decoupled from their numerical bottlenecks? Previous attempts to answer this question have, among other methods, given rise to semi-empirical quantum chemistry in minimal basis representation. We present an adaptation of the recently proposed SchNet for Orbitals (SchNOrb) deep convolutional neural network model [Nature Commun. 10, 5024 (2019)] for electronic wave functions in an optimised quasi-atomic minimal basis representation. For five organic molecules ranging from 5 to 13 heavy atoms, the model accurately predicts molecular orbital energies and wavefunctions and provides access to derived properties for chemical bonding analysis. Particularly for larger molecules, the model outperforms the original atomic-orbital-based SchNOrb method in terms of accuracy and scaling. We conclude by discussing the future potential of this approach in quantum chemical workflows.
description: 15 pages, 9 figures
Two-photon coincident-frequency-entanglement via extended phase matching
Creators: name: Kuzucu, Onur
name: Fiorentino, Marco
name: Albota, Marius A.
name: Wong, Franco N. C.
name: Kaertner, Franz X.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate a new class of frequency-entangled states generated via spontaneous parametric down-conversion under extended phase matching conditions. Biphoton entanglement with coincident signal and idler frequencies is observed over a broad bandwidth in periodically poled KTiOPO$_4$. We demonstrate high visibility in Hong-Ou-Mandel interferometric measurements under pulsed pumping without spectral filtering, which indicates excellent frequency indistinguishability between the down-converted photons. The coincident-frequency entanglement source is useful for quantum information processing and quantum measurement applications.
description: 4 pages, 3 figures, submitted to PRL
Superflares on the late-type giant KIC 2852961 -- Scaling effect behind flaring at different energy levels
Creators: name: Kővári, Zs.
name: Oláh, K.
name: Günther, M. N.
name: Vida, K.
name: Kriskovics, L.
name: Seli, B.
name: Bakos, G. Á.
name: Hartman, J. D.
name: Csubry, Z.
name: Bhatti, W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The most powerful superflares reaching 10$^{39}$erg bolometric energy are from giant stars. The mechanism behind flaring is supposed to be the magnetic reconnection, which is closely related to magnetic activity including starspots. However, it is poorly understood, how the underlying magnetic dynamo works and how the flare activity is related to the stellar properties which eventually control the dynamo action. We analyse the flaring activity of KIC 2852961, a late-type giant star, in order to understand how the flare statistics are related to that of other stars with flares and superflares and what the role of the observed stellar properties in generating flares is. We search for flares in the full Kepler dataset of the star by an automated technique together with visual inspection. We set a final list of 59 verified flares during the observing term. We calculate flare energies for the sample and perform a statistical analysis. The stellar properties of KIC 2852961 are revised and a more consistent set of parameters are proposed. The cumulative flare energy distribution can be characterized by a broken power-law, i.e. on the log-log representation the distribution function is fitted by two linear functions with different slopes, depending on the energy range fitted. We find that the total flare energy integrated over a few rotation periods correlates with the average amplitude of the rotational modulation due to starspots. Flares and superflares seem to be the result of the same physical mechanism at different energetic levels, also implying that late-type stars in the main sequence and flaring giant stars have the same underlying physical process for emitting flares. There might be a scaling effect behind generating flares and superflares in the sense that the higher the magnetic activity the higher the overall magnetic energy released by flares and/or superflares.
description: 14 pages, 17 figures, 4 tables, accepted for publication in Astronomy and Astrophysics
Assessing Forecasting Performance of Business Tendency Surveys during the Great Recession: Evidence for Russia
Creators: name: Siliverstovs, Boriss
name: Smirnov, Sergey
name: Tsukhlo, Sergey
Publisher: name: ETH Zurich
Year: 2012
Subjects: ECONOMETRICS AND ECONOMETRIC MODELS (OPERATIONS RESEARCH)
RUSSIA (FROM 1991 AND UNTIL 1917). RUSSIAN FEDERATION
RUSSLAND (AB 1991 UND VOR 1917). RUSSISCHE FÖDERATION
BUSINESS FORECASTS
The Great Recession
BETRIEBSWIRTSCHAFTLICHE PROGNOSE
ÖKONOMETRIE UND ÖKONOMETRISCHE MODELLE (OPERATIONS RESEARCH)
FINANCIAL CRISIS
Forecasting, model selection
Russia
Business tendency surveys
Autometrics
FINANZKRISEN
info:eu-repo/classification/ddc/330
Economics

description: KOF Working Papers, 306
title: Form statt Technik : Untersuchung zur Ersetzung der Haustechnik durch architektonische Maßnahmen
Creators: name: Bocchini, Francesca
Publisher: name: TU Wien
Year: 2016
Subjects: subject: Nachhaltigkeit
subject: Low-Tech
subject: passive Systeme
subject: Architektur
subject: Haustechnik

description: Im Sinne der Nachhaltigkeit stellen die gebäudetechnischen Anlagen eine Schwachstelle der Bausubstanz dar. Es liegt in der Natur technischer Geräte kurzlebig zu sein: - weil sie schnell altern, da die Technik eng verbunden mit dem Fortschritt ist; - weil sie Produkte sind, die in einer Marktwirtschaft zu den Konsumgütern zählen - weil Anlagen und Maschinen intensive Wartung benötigen, um die versprochene Leistung zu garantieren - wegen der eingebauten Obsoleszenz. Es wird schon seit längerer Zeit immer wieder für die Reduktion des Haustechnik-Ausbaus plädiert, einerseits aus Rohstoffmangel, andererseits wegen der aufwändigen Handhabung und Instandhaltung bzw. auch aus ökologischen Gründen. Die Umsetzung dieser Forderung scheint auf jeden Fall aus mehreren Gesichtspunkten sinnvoll zu sein. Ausgehend von der Beschreibung der Entwicklung der Haustechnik in Zusammenhang mit der Architekturgeschichte will diese Arbeit die Auswirkungen und die Korrelationen erfassen, die zur Interdependenz zwischen Architektur und TGA geführt haben. Anhand sorgfältig ausgewählter Beispiele wird präsentiert, welche Planungs-methoden und architektonischen Lösungen eine deutliche Reduktion des haustechnischen Anteils ermöglichen. Aus dieser Analyse wird ersichtlich, wie eine konsequente klimabewusste Gestaltung kombiniert mit dem Einsatz neuer, leistungsfähiger Materialien und Bauteilen zur Planung architektonisch wertvollen Gebäuden führt, die ohne bzw. mit einem sehr geringem Einsatz von HT-Systemen ein hervorragendes Raumklima, sehr gute Wirtschaftlichkeit (im Hinblick auf den gesamten Lebenszyklus) und eine effiziente energetische Leistung kombinieren.
Assessing durability of geopolymer concrete mortar for sewer pipe coating
Creators: name: Ariyadasa, Piumika
Publisher: name: University of Southern Queensland
Year: 2024
Subjects: Low calcium Fly Ash
Alkali-activated geopolymer
Microbial Induced Concrete Corrosion
structural grade repair mortar
sewer rehabilitation
durability andlong-term performances

description: Alkali-activated geopolymer (GP) is emerging as a promising alternative to Ordinary Portland Cement (OPC) in addressing microbial-induced concrete corrosion (MICC) of concrete structures in aggressive sewerage environments. However, identifying an effective binder formulation for GP to combat aggressive MICC remains a challenge, highlighting the need for developing sustainable repair materials. This study conducted extensive experimental studies to assess the long-term performance and durability of low calcium-based geopolymer mortar under simulated typical aggressive sewer conditions. Class F fly ash (FA) serves as the sole precursor for GP mortar. The approach included developing, characterising, and selecting optimal low-calcium FA-only geopolymer (FAGP) mortar mixes, evaluating bond strength to typical sewer pipe substrates, investigating acid resistance in terms of macro and microstructural evolution, and ultimately assessing FAGP degradation mechanism and longterm performance under hostile typical sewer conditions. The results demonstrate that FAGP mortar, with appropriate adjustments, can achieve sprayable consistency structural mortar comparable to standard OPC repair mortar. Material compatibility and adhesion properties of FAGP mortar surpass the standard OPC, regardless of substrate conditions. The holistic approach of assessing the deterioration of FAGP qualitatively and quantitatively demonstrated that acid exposure caused no substantial changes to the microstructural properties, corroborating the results for mass and cross-sectional analysis. FAGP retained 30% of its mechanical integrity under highly aggressive sewer conditions, whereas OPC failed to endure beyond the initial phase of the exposure period. The phase alterations and the resultant functional groups in the acid-exposed FAGP indicated new formations. However, these formations appeared to impede the acid reaction, thereby slowing the corrosion process compared to OPC. Despite the corrosion process intensifying with prolonged exposure duration, FAGP exhibited excellent acid resistance relative to OPC, regardless of the sewer conditions. This comprehensive evaluation confirms the feasibility of using geopolymers as repair materials in sewer rehabilitation, demonstrating their high acid resistance, durability, and long-term performance under aggressive conditions.
Regional challenges on the South-East Romanian agricultural market
Creators: name: Alboiu, Cornelia
name: Alboiu, Cornelia
Publisher: name: Unknown
Year: 2007
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Land Economics/Use
subject: crop structure
subject: irrigated area
subject: gross margin value

description: The present paper intends to make an analysis at regional level, respectively in Galati county, in order to determine the present situation of agriculture in the South-East region of Romania; it investigates the possibility of changing the crop structure towards more added value such as vegetables and energy crops (rapeseed, maize) in the region which better respond to the irrigation use. The paper reveals the situation of the irrigation system and the willingness of farmers in the region to pay for irrigations taking into consideration the gross margin value calculated by the main cultivated crops and the type of farms in the respective region. The main investigated aspects are the number of farms and their type, the ownership structure and the degree of land fragmentation, the utilized agricultural area by type of farms, the farm size. At the same time, the paper investigates the crop structure, the irrigated area and the number of irrigation equipment, the number of agricultural machinery and equipment, the market orientation of farms, the type and development level of the non-agricultural activities in the respective county and the specialization of farms in the South-East region of Romania.
On the geometry of curves and conformal geodesics in the Mobius space
Creators: name: Magliaro, Marco
name: Mari, Luciano
name: Rigoli, Marco
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: primary 53A30, secondary 53C30

description: This paper deals with the study of some properties of immersed curves in the conformal sphere $\mathds{Q}_n$, viewed as a homogeneous space under the action of the Möbius group. After an overview on general well-known facts, we briefly focus on the links between Euclidean and conformal curvatures, in the spirit of F. Klein's Erlangen program. The core of the paper is the study of conformal geodesics, defined as the critical points of the conformal arclength functional. After writing down their Euler-Lagrange equations for any $n$, we prove an interesting codimension reduction, namely that every conformal geodesic in $\mathds{Q}_n$ lies, in fact, in a totally umbilical 4-sphere $\mathds{Q}_4$. We then extend and complete the work in (Musso, "The conformal arclength functional", Math Nachr.) by solving the Euler-Lagrange equations for the curvatures and by providing an explicit expression even for those conformal geodesics not included in any conformal 3-sphere.
description: 40 pages
Magnetic Monopole in the Loop Representation
Creators: name: Leal, Lorenzo
name: Lopez, Alexander
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We quantize the electromagnetic field in the presence of a static magnetic monopole, within the loop-representation formalism. We find that the loop-dependent wave functional becomes multivalued, in the sense that it acquires a dependence on the surfaces bounded by the loop. This generalizes what occurs in quantum mechanics in multiply connected spaces. When Dirac's quantization condition holds, this surface-dependence disappears, together with the effect of the monopole on the electromagnetic field.
description: reference and comment added
Heterogeneous CPU/GPU co-execution of CFD simulations on the POWER9 architecture: Application to airplane aerodynamics
Creators: name: Borrell, R.
name: Dosimont, D.
name: Garcia-Gasulla, M.
name: Houzeaux, G.
name: Lehmkuhl, O.
name: Mehta, V.
name: Owen, H.
name: Vazquez, M.
name: Oyarzun, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: High fidelity Computational Fluid Dynamics simulations are generally associated with large computing requirements, which are progressively acute with each new generation of supercomputers. However, significant research efforts are required to unlock the computing power of leading-edge systems, currently referred to as pre-Exascale systems, based on increasingly complex architectures. In this paper, we present the approach implemented in the computational mechanics code Alya. We describe in detail the parallelization strategy implemented to fully exploit the different levels of parallelism, together with a novel co-execution method for the efficient utilization of heterogeneous CPU/GPU architectures. The latter is based on a multi-code co-execution approach with a dynamic load balancing mechanism. The assessment of the performance of all the proposed strategies has been carried out for airplane simulations on the POWER9 architecture accelerated with NVIDIA Volta V100 GPUs.
Mappings of finite distortion of polynomial type
Creators: name: Guo, Changyu
Publisher: name: arXiv
Year: 2012
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30C65

description: Suppose that $f: \bR^n\to\bR^n$ is a mapping of $K$-bounded $p$-mean distortion for some $p>n-1$. We prove the equivalence of the following properties of $f$: doubling condition for $J(x,f)$ over big balls centered at origin, boundedness of multiplicity function $N(f,\bR^n)$, polynomial type of $f$ and polynomial growth condition for $f$.
description: 12 pages
"The love token of a token immigrant" : Judith Merril’s expatriate narrative, 1968-1972
Creators: name: McCann, Jolene
Publisher: name: University of British Columbia
Year: 2010

description: Judith Merril was an internationally acclaimed science fiction (sf) writer and editor who expatriated from the United States to Canada in November 1968 with the core of what would become the Merril Collection of Science Fiction, Speculation and Fantasy in Toronto. Merril chronicled her transition from a nominal American or "token immigrant" to an authentic Canadian immigrant in personal documents and a memoir, Better to Have Loved: the Life of Judith Merril (2002). I argue that Sidonie Smith's travel writing theory, in particular, her notion of the "expatriate narrative" elucidates Merril's transition from a 'token' immigrant to a representative token of the American immigrant community residing in Toronto during the 1960s and 1970s. I further argue that Judith Merril's expatriate narrative links this personal transition to the simultaneous development of her science fiction library from its formation at Rochdale College to its donation by Merril in 1970 as a special branch of the Toronto Public Library (TPL). For twenty-seven years after Merril's expatriation from the United States, the Spaced Out Library cum Merril Collection - her love-token to the city and the universe - moored Merril politically and intellectually in Toronto.
Teakanbau im Nordwesten Nicarraguas: Wie wirken öffentlich--private Entwicklungsprojekte auf die Lebenshaltungsysteme der Teilnehmer?
Creators: name: Scheid, Fabian
name: Scheid, Fabian
Publisher: name: Unknown
Year: 2013
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: Institutional and Behavioral Economics
subject: Production Economics
subject: Production system
subject: Geophrafy apprach

description: Vorwort und Danksagung Diese Arbeit entstand aus der Motivation heraus, das Masterstudium " Geographie: Globaler Wandel - regionale Nachhaltigkeit" an der Universität Innsbuck mit einer Arbeit zu beenden, die sich thematisch mit dem Feld der Entwicklungszusammenarbeit auseinandersetzt und einen Auslandsaufenthalt beinhaltet. Hinzu kam das starke personliche Interesse, dies mit dem Thema Welthandel zu verknüpfen und im Speziellen mehr uber den Handel mit Produkten aus der Entwicklungszusammenarbeit in Erfahrung zu bringen. Aufgrund der regionalen Verortung des Instituts fur Geographie war Lateinamerika bevorzugtes Ziel meines Aufenthaltes. Hinzu kamen personliche Neigungen, eine halbes Jahr meiner Schulzeit hatte ich in Costa Rica verbracht. Dass letztlich eine Zusammenarbeit mit der BoDoMe Farmparthners SA. zustande kam, verdanke ich dem Zufall, das mein kollege Stefan Wieser dort arbeit und kontakt fur mich herstellte. Vor diesem Hintergrund mochte ich zunachst Herrn Pro. Dr. Coy Fur die ausgezeichnete Betreuung danke. Des Weiteren danke ich ganz herzlich Herrn Dr. Lill-Rastern, Grunder der BoDoMe Farmpartners SA. Fur die großartige unterstützung in Nicaragua danke ich insbesondere Herrn Zúniga von der UNAN Leon, der sehr viel Energie und Zeit in meine Betreuung vor Ort investierte, auch seine Mithilfe trug maßgeblich dazu bei, dass diese Arbeit entstehen konnte. Darüber hinaus danke ich den Projektmitarbeitern Cesar Santana, Dariel Iyaguirre, Don Santos sowie Herrn Braunmiller von der GIZ. Sie brachten mir und meinem Anliegen ausgesprochen viel Geduld entgegen und halfen mir mit ihrer logistischen Unterstützung sehr. Albertus Valkendbur half mir, zahlreiche kontakte herzustellen, auch dafür möchte ich danken. Ebenfalls erwähnt seien dir vielen befragten Experten und die Teilnehmer des Projekts.
description: Pasantia del Master Fabian Sheid de la Universidad INNSBUR, Berlin Alemania.
Braneworld black hole gravitational lens: Strong field limit analysis
Creators: name: Eiroa, Ernesto F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, a braneworld black hole is studied as a gravitational lens, using the strong field limit to obtain the positions and magnifications of the relativistic images. Standard lensing and retrolensing situations are analyzed in a unified setting, and the results are compared with those corresponding to the Schwarschild black hole lens. The possibility of observing the strong field images is discussed.
description: 11 pages, 1 figure; v2: extended conclusions, one new reference added, typos corrected
Fermionization in an expanding 1D gas of hard-core bosons
Creators: name: Rigol, Marcos
name: Muramatsu, Alejandro
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We show by means of an exact numerical approach that the momentum distribution of a free expanding gas of hard-core bosons on a one-dimensional lattice approaches to the one of noninteracting fermions, acquiring a Fermi edge. Yet there is a power-law decay of the one-particle density matrix $ρ_x\sim 1/\sqrt{x}$, as usual for hard-core bosons in the ground state, which accounts for a large occupation of the lowest natural orbitals for all expansion times. The fermionization of the momentum distribution function, which is not observed in equilibrium, is analyzed in detail.
description: Revtex file, 4 pages, 6 figures, published version
Generalized quasidisks and conformality II
Creators: name: Guo, Changyu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30C62, 30C65

description: We introduce a weaker variant of the concept of three point property, which is equivalent to a non-linear local connectivity condition introduced in [12], sufficient to guarantee the extendability of a conformal map f from the unit disk onto a domain to the entire plane as a homeomorphism of locally exponentially integrable distortion. Sufficient conditions for extendability to a homeomorphism of locally p-integrable distortion are also given.
description: 1 figure
Fractional Sobolev-Poincare inequalities in irregular domains
Creators: name: Guo, Chang-Yu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46E35, 26D10

description: This paper is devoted to the study of fractional (q,p)-Sobolev-Poincare inequalities in irregular domains. In particular, we establish (essentially) sharp fractional (q,p)-Sobolev-Poincare inequality in s-John domains and in domains satisfying the quasihyperbolic boundary conditions. When the order of the fractional derivative tends to 1, our results tends to the results for the usual derivative. Furthermore, we verified that those domains that support the fractional (q,p)-Sobolev-Poincare inequality together with a separation property are s-diam John domains for certain s, depending only on the associated data. We also point out an inaccurate statement in [2].
Helical magnetic fields from Riemann coupling
Creators: name: Kushwaha, Ashu
name: Shankaranarayanan, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the inflationary generation of helical magnetic fields from the Riemann coupling with the electromagnetic field. Most models in the literature introduce non-minimal coupling to the electromagnetic fields with a scalar field, hence, breaking the conformal invariance. In this work, we show that non-minimal coupling to the Riemann tensor generates sufficient primordial helical magnetic fields at all observable scales. We explicitly show that one of the helical states decay while the other helical mode increases, leading to a net non-zero helicity. Our model has three key features:~(i) the helical power-spectrum has a slight red-tilt for slow-roll inflation consistent with bounds from observations and free from backreaction problem, (ii) the energy density of the helical fields generated is at least one order of magnitude larger than the scalar-field coupled models, and (iii) unlike the scalar field coupled models, the generated helical fields are insensitive to the reheating dynamics. We show that our model generates the magnetic field of strength 0.01 PicoGauss over Mpc scale.
description: v2: 26 pages,3 figures, Accepted in Phys. Rev. D
Magnetic field generation in fully convective rotating spheres
Creators: name: Dobler, W.
name: Stix, M.
name: Brandenburg, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Magnetohydrodynamic simulations of fully convective, rotating spheres with volume heating near the center and cooling at the surface are presented. The dynamo-generated magnetic field saturates at equipartition field strength near the surface. In the interior, the field is dominated by small-scale structures, but outside the sphere by the global scale. Azimuthal averages of the field reveal a large-scale field of smaller amplitude also inside the star. The internal angular velocity shows some tendency to be constant along cylinders and is ``anti-solar'' (fastest at the poles and slowest at the equator).
description: 12 pages, 11 figures, 2 tables, to appear in the 10 Feb issue of ApJ
Regional disparities in off-farm employment and their impact on agricultural production and sales - evidence from Romania
Creators: name: Tudor, Monica
name: Balint, Borbala
name: Tudor, Monica
name: Balint, Borbala
Publisher: name: Unknown
Year: 2007
Subjects: subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Consumer/Household Economics
subject: off-farm employment
subject: region
subject: agricultural production

description: During the transition towards a market economy in Romania most enterprises established at the time of industrialization and urbanization project of the communist period reduced or stopped their activity and many employees lost their jobs. A reverse migration from urban to rural areas took place, thus contributing to the increase in employment and underemployment in agriculture - the main occupation in the rural areas. The emerging farmers without necessary production factors, know-how and confronted with inadequate input and output markets decreased their agricultural sales and purchase of agricultural goods, while increasing self-consumption in the household. Given the interaction between unemployment, the increase of employment in agriculture and consequently in self-consumption in the households, the paper analyzes how the differences in the off-farm employment opportunities in the different regions impact agricultural commercialization.
Element Stratification in the Middle-Aged Type Ia Supernova Remnant G344.7-0.1
Creators: name: Fukushima, Kotaro
name: Yamaguchi, Hiroya
name: Slane, Patrick O.
name: Park, Sangwook
name: Katsuda, Satoru
name: Sano, Hidetoshi
name: Lopez, Laura A.
name: Plucinsky, Paul P.
name: Kobayashi, Shogo B.
name: Matsushita, Kyoko
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Despite their importance, a detailed understanding of Type Ia supernovae (SNe Ia) remains elusive. X-ray measurements of the element distributions in supernova remnants (SNRs) offer important clues for understanding the explosion and nucleosynthesis mechanisms for SNe Ia. However, it is challenging to observe the entire ejecta mass in X-rays for young SNRs, because the central ejecta may not have been heated by the reverse shock yet. Here we present over 200 kilosecond Chandra observations of the Type Ia SNR G344.7-0.1, whose age is old enough for the reverse shock to have reached the SNR center, providing an opportunity to investigate the distribution of the entire ejecta mass. We reveal a clear stratification of heavy elements with a centrally peaked distribution of the Fe ejecta surrounded by intermediate-mass elements (IMEs: Si, S, Ar Ca) with an arc-like structure. The centroid energy of the Fe K emission is marginally lower in the central Fe-rich region than in the outer IME-rich regions, suggesting that the Fe ejecta were shock-heated more recently. These results are consistent with the prediction for standard SN Ia models, where the heavier elements are synthesized in the interior of an exploding white dwarf. We find, however, that the peak location of the Fe K emission is slightly offset to the west with respect to the geometric center of the SNR. This apparent asymmetry is likely due to the inhomogeneous density distribution of the ambient medium, consistent with our radio observations of the ambient molecular and neutral gas.
description: 16 pages, 10 figures, Accepted for publication in Astrophysical Journal
Two-photon interference with thermal light
Creators: name: Scarcelli, Giuliano
name: Valencia, Alejandra
name: Shih, Yanhua
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The study of entangled states has greatly improved the basic understanding about two-photon interferometry. Two-photon interference is not the interference of two photons but the result of superposition among indistinguishable two-photon amplitudes. The concept of two-photon amplitude, however, has generally been restricted to the case of entangled photons. In this letter we report an experimental study that may extend this concept to the general case of independent photons. The experiment also shows interesting practical applications regarding the possibility of obtaining high resolution interference patterns with thermal sources.
description: Added reference 14
Yamabe type equations with a sign-changing nonlinearity, and the prescribed curvature problem
Creators: name: Bianchini, Bruno
name: Mari, Luciano
name: Rigoli, Marco
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics

description: In this paper, we investigate the prescribed scalar curvature problem on a non-compact Riemannian manifold $(M, \langle \, , \, \rangle)$, namely the existence of a conformal deformation of the metric $\langle \, , \, \rangle$ realizing a given function $\widetilde s(x)$ as its scalar curvature. In particular, the work focuses on the case when $\widetilde s(x)$ changes sign. Our main achievement are two new existence results requiring minimal assumptions on the underlying manifold, and ensuring a control on the stretching factor of the conformal deformation in such a way that the conformally deformed metric be quasi-isometric to the original one. The topological-geometrical requirements we need are all encoded in the spectral properties of the standard and conformal Laplacians of $M$. Our techniques can be extended to investigate the existence of entire positive solutions of quasilinear equations of the type $$ Δ_{p} u + a(x)u^{p-1} - b(x)u^σ= 0 $$ where $Δ_p$ is the $p$-Laplacian, $σ>p-1>0$, $a,b \in L^\infty_{\mathrm{loc}}(M)$ and $b$ changes sign, and in the process of collecting the material for the proof of our theorems, we have the opportunity to give some new insight on the subcriticality theory for the Schrödinger type operator $$ Q_V' \ : \ φ\longmapsto -Δ_p φ- a(x)|φ|^{p-2}φ. $$ In particular, we prove sharp Hardy-type inequalities in some geometrically relevant cases, notably for minimal submanifolds of the hyperbolic space.
description: 70 pages, 2 figures. Last minor corrections. In press, to appear on Journal of Differential Equations
title: Renewable energies in the context of rural electrification and the path towards a successful rural electrification strategy in Senegal
Creators: name: Steindl, Miriam
Publisher: name: TU Wien
Year: 2016
Subjects: subject: Rural electrification
subject: Renewable energies
subject: Sustainable energy policy
subject: Sustainable development

description: Given that especially rural areas in developing countries still largely remain underpowered today, this thesis attempts to investigate the aspects that are most vital for a successful rural electrification strategy in developing countries. With its large natural resources and its enormous potential in terms of renewable energies to be exploited for the matter of modern energy generation, sub-Saharan Africa is in the focus of attention. Based on the assumption that rural electrification rates in sub-Saharan Africa remain extremely low today due to a lack of appropriate strategies in most countries, the purpose of this master thesis is to identify the aspects that are at the root of the problem and that impede a significant increase in access rates in rural areas. This will be done by contrasting the current knowledge about the most favorable policy measures and factors for a successful rural electrification strategy to the strategy of Senegal, a country that has shown its commitment to work towards these ends but has failed so far to achieve satisfactory outcomes in terms of access rates. The first section provides the reader with an overview on rural electrification in developing countries and presents the state of rural electrification in sub-Saharan Africa. It elaborates on the region's energy uses patterns, choices of renewable energy technologies for the rural context and electricity distribution, covering the actors, delivery models and price reduction measures. It then highlights the various constraining factors to rural electrification. The following section looks into Senegal's rural electrification strategy. After giving a country overview, it discusses several national policy documents that reflect the country-s serious commitment to provide its rural population with sustainable energy in the years to come. This section further covers Senegal's electricity sector and the use and potential of renewable energies. The present work reveals that the assumption that rural electrification rates in sub-Saharan Africa remain extremely low today due to a lack of appropriate strategies in most countries needs to be revised. For the case of Senegal, it proves to be difficult to extract the major flaws in the strategy. This is mainly due to the fact that the success of a rural electrification strategy depends on a great number of factors that extend beyond institutional, economic, policy-related, environmental and technological borders.
The multipolar structure of fuzzballs
Creators: name: Bianchi, Massimo
name: Consoli, Dario
name: Grillo, Alfredo
name: Morales, Jose Francisco
name: Pani, Paolo
name: Raposo, Guilherme
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We extend and refine a general method to extract the multipole moments of arbitrary stationary spacetimes and apply it to the study of a large family of regular horizonless solutions to $ {\cal N}{\,=\,}2$ four-dimensional supergravity coupled to four Abelian gauge fields. These microstate geometries can carry angular momentum and have a much richer multipolar structure than the Kerr black hole. In particular they break the axial and equatorial symmetry, giving rise to a large number of nontrivial multipole moments. After studying some analytical examples, we explore the four-dimensional parameter space of this family with a statistical analysis. We find that microstate mass and spin multipole moments are typically (but not always) larger that those of a Kerr black hole with the same mass and angular momentum. Furthermore, we find numerical evidence that some invariants associated with the (dimensionless) moments of these microstates grow monotonically with the microstate size and display a global minimum at the black-hole limit, obtained when all centers collide. Our analysis is relevant in the context of measurements of the multipole moments of dark compact objects with electromagnetic and gravitational-wave probes, and for observational tests to distinguish fuzzballs from classical black holes.
description: 29 pages, 1 figure
The Impact of LFA payments in different rural structures - an example of the Czech Republic and Poland
Creators: name: Stolbova, Marie
name: Niewęgłowska, Grażyna
name: Stolbova, Marie
name: Niewęgłowska, Grażyna
Publisher: name: Unknown
Year: 2007
Subjects: subject: Community/Rural/Urban Development
subject: Environmental Economics and Policy
subject: Land Economics/Use
subject: Less favoured area
subject: agricultural holdings' structures
subject: Czech Republic
subject: Poland

description: Core objectives for rural development support for the programming period 2007-2013 are: (1) improving the competitiveness of agriculture and forestry, (2) improving the environment and the countryside, and (3) improving the quality of life in rural areas and encouraging diversification of economic activity. Regulation (EC) No 1698/2005 includes a clearer targeting towards smaller and micro - enterprises to sustain job opportunity in rural areas. For this programming period a minimum funding of 10% of the total EU contribution has been withheld by the Council Regulation for measures concerning the quality of life and diversification of the rural economy outside agriculture and forestry. In spite of it the EU's Court of Auditors has concluded that Rural development policy in Europe is ineffective because continues to allow member states to adopt a predominantly sector approach with a primary focus on the agricultural sector. Taking into account the variety of regions in Europe and the different situations at national level, it is difficult to provide a single guideline to solve the problem. This paper deals with possible impact of Less Favorite Area payments on rural development. Special attention will be given to the role of LFA in maintenance of agricultural production that is desirable from environmental point of view and overcoming common rural problems like depopulation of rural areas. Using the case of Poland and Czech specific implementation of LFA payments rules will be compared (that to be done with respect to different rural structures between those two countries). Descriptive analysis of farm structures development patterns will be used to explain low economic effectiveness of LFA instrument. Similarly presentation of spatial distribution of LFA payment will be used to investigate its environmental effectiveness. Groups offarms that are major beneficiaries of LFA instrument are to be selected and compared with the objective one. It is expected that comparative analysis clarify the practical efficiency of LFA instrument in rural development. Finally, the conclusion concerned with future CAP is to be presented in respect of supporting regional rural development.