cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
China’s Evolving Agricultural Support Policies
Creators: name: Hejazo, Mina
name: Marchant, Mary A.
name: Hejazo, Mina
name: Marchant, Mary A.
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agricultural and Food Policy
subject: International Relations/Trade
subject: Agricultural commodities
subject: Agricultural policy
subject: China, Price supports
subject: Target prices
subject: U.S.-China trade

description: China’s price support programs, aimed at improving food security and grower incomes, led to increased domestic prices. The resulting gap between domestic and international prices created large stockpiles. In response, China implemented target prices for cotton and soybeans and eliminated corn price supports. Self-sufficiency agricultural policies continue.
A multiple-scattering approach to interatomic interactions and superradiance in inhomogeneous dielectrics
Creators: name: Wubs, Martijn
name: Suttorp, L. G.
name: Lagendijk, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The dynamics of a collection of resonant atoms embedded inside an inhomogeneous nondispersive and lossless dielectric is described with a dipole Hamiltonian that is based on a canonical quantization theory. The dielectric is described macroscopically by a position-dependent dielectric function and the atoms as microscopic harmonic oscillators. We identify and discuss the role of several types of Green tensors that describe the spatio-temporal propagation of field operators. After integrating out the atomic degrees of freedom, a multiple-scattering formalism emerges in which an exact Lippmann-Schwinger equation for the electric field operator plays a central role. The equation describes atoms as point sources and point scatterers for light. First, single-atom properties are calculated such as position-dependent spontaneous-emission rates as well as differential cross sections for elastic scattering and for resonance fluorescence. Secondly, multi-atom processes are studied. It is shown that the medium modifies both the resonant and the static parts of the dipole-dipole interactions. These interatomic interactions may cause the atoms to scatter and emit light cooperatively. Unlike in free space, differences in position-dependent emission rates and radiative line shifts influence cooperative decay in the dielectric. As a generic example, it is shown that near a partially reflecting plane there is a sharp transition from two-atom superradiance to single-atom emission as the atomic positions are varied.
description: 18 pages, 4 figures, to appear in Physical Review A
Riemannian light cone from vanishing birefringence in premetric vacuum electrodynamics
Creators: name: Lämmerzahl, Claus
name: Hehl, Friedrich W.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider premetric electrodynamics with a local and linear constitutive law for the vacuum. Within this framework, we find quartic Fresnel wave surfaces for the propagation of light. If we require vanishing birefringence in vacuum, then a Riemannian light cone is implied. No proper Finslerian structure can occur. This is generalized to dynamical equations of any order.
description: 12 pages latex
title: Begünstigende Faktoren für urbane Luftseilbahnen : Konzept einer GIS-unterstützten Standortanalyse
Creators: name: Schedereit, Valentin
Publisher: name: TU Wien
Year: 2015
Subjects: subject: GIS
subject: Luftseilbahn
subject: Bewertung
subject: GIS
subject: cable cars
subject: evaluation

description: Luftseilbahnen verkehren nicht mehr ausschließlich im alpinen Gelände, sondern vermehrt auch als öffentliche Verkehrsmittel in der Stadt. Da es weltweit in immer mehr Städten Projektvorschläge für Luftseilbahnen, insbesondere Umlaufbahnen, gibt, stellt sich die Frage: Wo ist ihr Einsatz sinnvoll? Um diese Frage zu beantworten, werden in der vorliegenden Diplomarbeit anhand von Fallbeispielen begünstigende Faktoren für urbane Luftseilbahnen ermittelt: Dies sind zum einen strukturelle Standortfaktoren wie schwierige topographische Verhältnisse, dichte Siedlungsstrukturen und ein lückenhaftes bzw. überlaste-tes Verkehrssystem; zum anderen aber auch politische und ökonomische Rahmenbedingungen wie eine ÖV-freundliche Verkehrspolitik, eine gute städtische Wirtschaftslage sowie der Tourismus. Aufbauend auf diesen Erkenntnissen wird in der vorliegenden Arbeit ein Analysekonzept entworfen, mit dem potenzielle Standorte unter Verwendung von Geographischen Informationssystemen (GIS) auf ihre Eignung für Luftseilbahnen hin untersucht werden können. Das Konzept beinhaltet ein standardisiertes und schritt-weises Verfahren, das von der Ersteinschätzung über eine grobe Angebots- und Nachfrageanalyse bis hin zur technischen und ökonomischen Machbarkeitsanalyse reicht. Da GIS-Analysen nicht alle Aspekte behandeln können und benötigte Geodaten manchmal nur eingeschränkt verfügbar sind, fließen auch nicht-GIS-Untersuchungsmethoden in das vorgestellte Analysekonzept ein.
description: Cable cars (also referred to as aerial ropeways), generally known as a transport system for alpine environments, lately have also become an urban public means of transport. Cities all over the world are considering cable cars as a solution to their traffic problems. But where do they make sense? To answer this question, the present master-s thesis determines favourable factors for urban cable cars by analysing existing systems: On the one hand, there are structural factors like a challenging topography, dense settlement structures or an overloaded and incomplete transport network; on the other hand, there are political and economical circumstances like transport policies favouring public transport, a strong local economy and tourism that may help opting for a cable car system. On the basis of those findings, this thesis presents an analysis concept which helps to examine potential sites with respect to their suitability for cable cars, using geographic information systems (GIS). The concept is a standardised and step-by-step procedure that consists of an initial assessment, a basic supply and demand analysis and a technical and economical feasibility evaluation. However, as not all analyses can be carried out by GIS and required geodata is not always available, the site analysis concept also includes non-GIS-methods.
Tecnologie dell’informazione e della comunicazione, terziarizzazione e nuova divisione del lavoro digitale (Information and Communication Technologies, Tertiarization and the New Digital Division of Labour)
Creators: name: De Liso, Nicola
Publisher: name: Moneta e Credito
Year: 2012
Subjects: subject: Technology, Technologies
subject: O33, L86, L80

description: The process of tertiarisation of our economies is taking place along with the ever-increasing pervasiveness of information and communication technologies (ICTs). ICTs, in turn, are becoming "convergent" as they share a common basis, namely digital technology. This common basis is becoming so important that it has engendered the need to add a new dimension to the original Smithian idea of the division of labour, i.e. we have to take into account the new forms of the digital division of labour. This work therefore considers the broad process of structural economic dynamics which is engendered by the processes of digitization of our economies, taking the 1960s as a starting point. JEL Codes: O33, L86, L80 Keywords: Technology, Technologies
description: Moneta e Credito, V. 54, N. 216 (2001)
Poverty Analysis of Children in Child Headed Households in Addis Ababa
Creators: name: Getnet Alemu
name: Getnet Alemu
Publisher: name: Unknown
Year: 2011
Subjects: subject: Consumer/Household Economics
subject: Food Security and Poverty
subject: Poverty
subject: Children
subject: Ethiopia - Addis Ababa

description: This study attempts to analyse the economic and social situation of children living in child-headed households using a poverty analysis framework. The study used family of indexes developed by Foster, Greer and Thorbecke (1984) commonly known as FGT measures to measure aggregate poverty and micro-econometric method to uncover the various determinants of poverty status of children in child-headed households. Quantitative method (Household survey) was used to generate information. From the descriptive statistics we found out that the average monthly per capita income is about half of the poverty line and the average level of consumption is also by far below the poverty line. We found out that about 77.3% of the total CHHs are below the absolute poverty line. This figure is far below from the national urban average poverty level, reflecting the miserable living standard of CHHs. The difference in level of income and consumption between male-headed and female-headed households is very high. Close to 90% of female CHHs are living below the poverty line while the percentage for male CHHs is 59%. Gender differential is obvious in CHHs, indicating that female child headship leads to low level of welfare.From the regression result we found out that sex, size of household and age are determinants of child poverty. Male CHHs are less exposed to poverty compared to females. Household size increases the probability of falling into poverty, while its square reduced the probability of falling into poverty indicating the presence of economies of scale at the household level. The age of the head shows that the risk of poverty increases as age increases but at a decreasing rate as indicated by the coefficient on its squared variable. Likewise, increase in mean household age statistically is likely to worsen poverty.
description: Getnet Alemu_ Poverty Analysis of Children in Child Headed Households in Addis Ababa
Road Sector Development and Economic Growth in Ethiopia
Creators: name: Worku, Ibrahim
name: Worku, Ibrahim
Publisher: name: Unknown
Year: 2011
Subjects: subject: Community/Rural/Urban Development
subject: Teaching/Communication/Extension/Profession
subject: Infrastructure - Road
subject: Road sector development
subject: Economic Growth
subject: Communication - Transport-Ethiopia

description: The study attempts to see the trends, stock of achievements, and impact of road network on economic growth in Ethiopia. To do so, descriptive and econometric analyses are utilized. From the descriptive analysis, the findings indicate that the stock of road network is by now growing at an encouraging pace. The government’s spending has reached tenfold relative to what it was a decade ago. It also reveals that donors are not following the footsteps of the government in financing road projects. The issue of rural accessibility still remains far from the desired target level that the country needs to have. Regarding community roads, both the management and accountancy is weak, even to analyze its impact. Thus, the country needs to do a lot to graduate to middle income country status in terms of road network expansion, community road management and administration, and improved accessibility. The econometric analysis is based on time series data extending from 1971-2009. Augmented Cobb-Douglas production function is used to investigate the impact of roads on economic growth. The model is estimated using a two-step efficient GMM estimator. The findings reveal that the total road network has significant growth-spurring impact. When the network is disaggregated, asphalt road also has a positive sectoral impact, but gravel roads fail to significantly affect both overall and sectoral GDP growth, including agricultural GDP. By way of recommendation, donors need to strengthen their support on road financing, the government needs to expand the road network with the aim of increasing the current rural accessibility, and more attention has to be given for community road management and accountancy. Lastly, gravel road expansion has to be made to meet the target level of the road network and simultaneously ascertain rural accessibility, thereby improving agricultural productivity and market access of the poor rural population.
description: Ibrahim Worku_Road Sector Development and Economic Growth in Ethiopia
Equivalence of the super Lax and local Dunkl operators for Calogero-like models
Creators: name: Neelov, A. I.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81Q60

description: Following Shastry and Sutherland I construct the super Lax operators for the Calogero model in the oscillator potential. These operators can be used for the derivation of the eigenfunctions and integrals of motion of the Calogero model and its supersymmetric version. They allow to infer several relations involving the Lax matrices for this model in a fast way. It is shown that the super Lax operators for the Calogero and Sutherland models can be expressed in terms of the supercharges and so called local Dunkl operators constructed in our recent paper with M. Ioffe. Several important relations involving Lax matrices and Hamiltonians of the Calogero and Sutherland models are easily derived from the properties of Dunkl operators.
description: 25 pages, Latex, no figures. Accepted for publication in: Jounal of Physics A: Mathematical and General
Phương pháp phân loại lớp phủ bề mặt sử dụng ảnh cường độ phản hồi từ dữ liệu Lidar kết hợp với ảnh viễn thám
Creators: name: Thanh, Tung Dang
Publisher: name: figshare
Year: 2020
Subjects: subject: 40699 Physical Geography and Environmental Geoscience not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Physical Geography

description: ion at sub meter resolution. The article introduce common methods for classification namely: decision tree; object oriented; maximum likelihood, nearest neighborhood, neuron network. These methods are experimented with 4 different combination of above mentioned input data sources for test area in Bac Giang city. Classification evaluation using error matrix shows that in the best case we can distinguish 8 land cover classes: grass and bush; high tree; dry vacant land; wet vacant land; asphalt road; tiled roof; concrete roof with accuracy around 85- 90% when applying neuron network method using all the available input data. The research result opens up opportunity to quick establishment of land cover layer from Lidar data to add tolarge scale geodatabase.
MOTS in Schwarzschild: multiple self-intersections and extreme mass ratio mergers
Creators: name: Booth, Ivan
name: Hennigar, Robie
name: Mondal, Saikat
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the open and closed axisymmetric marginally outer trapped surfaces contained in leaves of constant Painlevé-Gullstrand time for Schwarzschild spacetimes. We identify a family of closed MOTS in the black hole interior characterized by an arbitrary number of self-intersections. This suggests that the self-intersecting behaviour reported in [Phys.Rev.D 100, 084044 (2019)] may be a far more generic phenomenon than expected. We also consider open surfaces, finding that their behaviour is highly constrained but includes surfaces with multiple self-intersections inside the horizon. We argue that the behaviour of open MOTS identifies and constrains the possible local behaviour of MOTS during extreme mass ratio mergers.
description: 20 pages, 20 figures. V2: Two paragraphs added to emphasize that results for PG slicings are expected to be more generic than those for a static slicing. Otherwise small changes in wording. Version submitted to journal, V3: Title and abstract changed to emphasize main results. Typos corrected in text. Published version
A new cembranoid from the Red Sea soft coral Sarcophyton acutum
Creators: name: Mohamed, Tarik A.
name: Abdelmawgoud, Seba M.
name: Hamdy, Abdelhamid A.
name: Ibrahim, Mahmoud A. A.
name: Elshamy, Abdelsamed I.
name: Atia, Mohamed A. M.
name: Kassem, Hanaa A.
name: Hegazy, Mohamed-Elamir F.
name: Selim, Nabil M.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Space Science
subject: Physical Sciences not elsewhere classified
subject: Cell Biology
subject: Pharmacology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Virology

description: The Red Sea soft coral Sarcophyton acutum ethyl acetate extract has afforded one new cembranoid; sarcacutumolid A (1), along with six known metabolites have been isolated from S. acutum for the first time (2-7). Chemical structures were elucidated by employing several spectroscopic analyses. The cytotoxic potential of the isolated compounds was assessed against four human cancer cell lines; hepatocellular (HepG2), cervical (HeLa), breast (MCF-7) and colorectal cancer (Colo-205). Sarcacutumolid A (1) and gorgosterol (7) inhibited colorectal cancer cell proliferation in a concentration-dependent manner with IC50 values of 35.5 and 44.0 μM, respectively.
Clement A.U. Ighodaro_Infrastructure and Agricultural Growth in Nigeria
Creators: name: Ighodaro, Clement A.U.
name: Ighodaro, Clement A.U.
Publisher: name: Unknown
Year: 2011
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Infrastructure
subject: Agricultural Growth
subject: Nigeria

description: The study considered infrastructure and agricultural growth in Nigeria using a time series data for over four decades and the Parsimonious Error Correction Model estimation technique. It was found that various performance indicators with respect to physical infrastructure used for the study have not been encouraging in Nigeria. The provision of infrastructure in Nigeria, particularly physical infrastructure is characterized by the predominance of public enterprises except for telecommunications sector in recent time. The empirical part of the study revealed different relative response rates of the different component of infrastructure used in the study to the growth of the agricultural sector in Nigeria. There was unidirectional causality between telecommunication facilities and agricultural production. The same result was found between labour and agricultural production. It was recommended that the sectoral specific effects of the various forms of infrastructure should be taken into consideration when designing policy for promoting agricultural growth in Nigeria.
description: Clement A.U. Ighodaro_Infrastructure and Agricultural Growth in Nigeria
title: Gmoa : das Dorf(Pflege)Zentrum in Pöttelsdorf
Creators: name: Fröch, Kerstin
Publisher: name: TU Wien
Year: 2015
Subjects: subject: dorf | pflege | zentrum
subject: village | care | center

description: Im Laufe meiner beruflichen Tätigkeit während meines Studiums wurde mir ein spannender Einblick in die Welt der Pflegewohnhäuser in Wien gewährt. Im Rahmen meiner Diplomarbeit möchte ich diese anspruchsvolle Thematik aufgreifen und auf ländliche Strukturen in meinem Heimatbundesland - dem Burgenland - adaptieren. Das Burgenland ist geprägt von Agglomerationen an Dörfern, die sich in einzelne Bezirke gliedern. Diese Dörfer erfahren im Moment einen strukturellen Wandel. Während ein zumeist großer Teil der Bevölkerung immer älter wird und die junge Generation den Dorfkern verlässt, wächst der Bedarf an regionalen Pflegeeinrichtungen, welche moderne Konzepte der Pflege und Betreuung innerhalb der gewohnten Umgebung eines Dorfgebietes offerieren. Die Gemeinde Pöttelsdorf im Bezirk Mattersburg verfolgt die Idee einer Realisierung eines neuen Gemeindezentrums, welches eine sinnvolle Bereicherung für die Pöttelsdorfer Bevölkerung darstellen soll. In meinem Projekt dorf
A strange metal with a small Fermi surface and strong collective excitations
Creators: name: Essler, F. H. L.
name: Tsvelik, A. M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We develop a theory of a hybrid state, where quasi-particles coexist with strong collective modes, taking as a starting point a model of infinitely many 1D Mott insulators coupled by a weak interchain tunneling. This state exists at an intermediate temperature range and undergoes an antiferromagnetic phase transition at temperatures much smaller than the Mott-Hubbard gap. The most peculiar feature of the hybrid state is that the volume of the Fermi surface is unrelated to the electron density. We present a self-consistent derivation of the low energy effective action for our model.
description: 12 pages, 7 figures
CONCEPTUALIZING DRIVERS OF POLICY CHANGE IN AGRICULTURE, NUTRITION, AND FOOD SECURITY: THE KALEIDOSCOPE MODEL
Creators: name: Resnick, Danielle
name: Babu, Suresh
name: Haggblade, Steven
name: Hendriks, Sheryl L.
name: Mather, David
name: Resnick, Danielle
name: Babu, Suresh
name: Haggblade, Steven
name: Hendriks, Sheryl L.
name: Mather, David
Publisher: name: Unknown
Year: 2015
Subjects: Political Economy

description: The current emphasis in the development community on demonstrating policy impact requires a better understanding of national policymaking processes to recognize opportunities for, and limits to, generating policy change. Consequently, this paper introduces an applied framework, named the kaleidoscope model, to analyze drivers of change in the food security arena, with a specific emphasis on agriculture and nutrition policies. Focusing on five key elements of the policy cycle—agenda setting, design, adoption, implementation, and evaluation and reform—the model identifies key variables that define the necessary and sufficient conditions for policy change to occur. These variables were inductively derived through an extensive review of the secondary literature on episodes of policy change in developing countries across a broad range of policy domains related to food security, including agriculture, education, healthcare, nutrition, and social protection.
Systematic Review of Published Meta-Analyses of Vaccine Safety
Creators: name: Rositsa B. Dimova
name: Egelebo, Christopher C.
name: Izurieta, Hector S.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: Biotechnology
subject: 20199 Astronomical and Space Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Meta-analysis can be especially useful for evaluation of vaccine safety, since individual studies often have limited power to detect an increase in safety risk. In order to gain a perspective on the current state of utilization of the technique of meta-analysis for evaluation of vaccine safety and to assess the methodological characteristics of these meta-analyses, we conducted a systematic review of published meta-analyses. We identified 61 meta-analyses of vaccine safety. Safety outcomes for influenza and human papillomavirus (HPV) vaccines were most frequently meta-analysed. The most studied safety outcomes were local and systemic reactions, as well as Serious Adverse Events. Most meta-analyses were literature based. Differences in the definitions of safety outcomes across the different studies and the poor reporting of safety in the published literature were described as challenges when conducting a meta-analysis of vaccine safety. A way to overcome these challenges is through the implementation of standardized safety outcomes definitions and reporting. A prospectively conducted meta-analysis, i.e. a meta-analysis planned prior to the conduct of the trials, as well as implementation of subject-level meta-analysis techniques can also reduce or eliminate the impact of these difficulties.
Struttura produttiva e sviluppo regionale di lungo periodo in Italia (Production Structure and Long-Run Regional Development in Italy)
Creators: name: Caianelli, Giulio
name: Leoncini, Riccardo
name: Montini, Anna
Publisher: name: Moneta e Credito
Year: 2012
Subjects: subject: Manufacturing, Regional Development, Regional
subject: R12, L60, R11, R23

description: During the 1990s the link between specialisation and/or variety of the production structure and long-run local development has been widely studied both at theoretical and empirical level. Following this research line, the aim of this paper is twofold. First of all, we analyse, by means of transition matrices, the evolution of the model of specialisation/variety of manufacturing industries at regional level in Italy during the twentieth century. Secondly, we investigate, from an econometric point of view, the potential impact of specialisation and/or of variety on the different growth rates of manufacturing employment of the Italian regions during the period 1927-91. In order to carry out this kind of empirical investigation, we have built up a new and original historical data set which, using statistical information drawn from the Italian Industrial Census carried out from 1911 to 1991, provides data on the number of employees for 15 manufacturing industries and for 18 regions. JEL Codes: R12, L60, R11, R23 Keywords: Manufacturing, Regional Development, Regional
description: Moneta e Credito, V. 54, N. 216 (2001)
Three Bead Rotating Chain model shows universality in the stretching of proteins
Creators: name: Seyed-allaei, Hamed
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We introduce a model of proteins in which all of the key atoms in the protein backbone are accounted for, thus extending the Freely Rotating Chain model. We use average bond lengths and average angles from the Protein Databank as input parameters, leaving the number of residues as a single variable. The model is used to study the stretching of proteins in the entropic regime. The results of our Monte Carlo simulations are found to agree well with experimental data, suggesting that the force extension plot is universal and does not depend on the side chains or primary structure of proteins.
TOWARDS A SUSTAINABLE SOIL FERTILITY STRATEGY IN GHANA
Creators: name: Jayne, Thomas
name: Kolavalli, Shashidhara
name: Debrah, Kofi
name: Ariga, Joshua
name: Brunache, Pierre
name: Kabaghe, Change
name: Nunez-Rodriguez, Walter
name: Owusu Baah, Kwaku
name: Bationo, Andre A.
name: Jeroen Huising, Elzo
name: Lambrecht, Isabel
name: Diao, Xinshen
name: Yeboah, Felix
name: Benin, Samuel
name: Andam, Kwaw
name: Jayne, Thomas
name: Kolavalli, Shashidhara
name: Debrah, Kofi
name: Ariga, Joshua
name: Brunache, Pierre
name: Kabaghe, Change
name: Nunez-Rodriguez, Walter
name: Owusu Baah, Kwaku
name: Bationo, Andre A.
name: Jeroen Huising, Elzo
name: Lambrecht, Isabel
name: Diao, Xinshen
name: Yeboah, Felix
name: Benin, Samuel
name: Andam, Kwaw
Publisher: name: Unknown
Year: 2015
Subjects: Productivity Analysis

description: Most efforts to raise fertilizer use in SSA over the past decade have focused on fertilizer subsidies and targeted credit programmes with hopes that these programmes could later be withdrawn once the profitability of fertilizer use has been made clear to adopting farmers and once they have become sufficiently capitalized to be able to afford fertilizer on their own. This line of reasoning under-emphasizes the evidence that many smallholder farmers obtain very low crop response rates to inorganic fertilizer application and hence cannot use it profitably at full market prices. A central hypothesis of this study is that Ghanaian farmers will demand increasing quantities of fertilizer when they can utilize it more profitably, and that doing so will require improved agronomic and soil management practices that enable farmers to achieve higher crop response rates to fertilizer application.
Detecting Kozai-Lidov imprints on the gravitational waves of intermediate-mass black holes in galactic nuclei
Creators: name: Deme, Barnabás
name: Hoang, Bao-Minh
name: Naoz, Smadar
name: Kocsis, Bence
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: A third object in the vicinity of a binary system causes variations in the eccentricity and the inclination of the binary through the Kozai-Lidov effect. We examine if such variations leave a detectable imprint on the gravitational waves of a binary consisting of intermediate mass black holes and stellar mass objects. As a proof of concept, we present an example where LISA may detect the Kozai-Lidov modulated gravitational wave signals of such sources from at least a distance of 1Mpc if the perturbation is caused by a supermassive black hole tertiary. Although the quick pericenter precession induced by general relativity significantly reduces the appropriate parameter space for this effect by quenching the Kozai-Lidov oscillations, we still find reasonable parameters where the Kozai-Lidov effect may be detected with high signal-to-noise ratios.
description: 10 pages; resubmitted after minor revision; typo is corrected in Eq. (2)
Transfer matrix functional relations for the generalized tau_2(t_q) model
Creators: name: Baxter, R. J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The $N$-state chiral Potts model in lattice statistical mechanics can be obtained as a ``descendant'' of the six-vertex model, via an intermediate ``$Q$'' or ``$τ_2 (t_q)$'' model. Here we generalize this to obtain a column-inhomogeneous $τ_2 (t_q)$ model, and derive the functional relations satisfied by its row-to-row transfer matrix. We do {\em not} need the usual chiral Potts relations between the $N$th powers of the rapidity parameters $a_p, b_p, c_p, d_p$ of each column. This enables us to readily consider the case of fixed-spin boundary conditions on the left and right-most columns. We thereby re-derive the simple direct product structure of the transfer matrix eigenvalues of this model, which is closely related to the superintegrable chiral Potts model with fixed-spin boundary conditions.
description: 21 pages, 5 figures
Specificità e modelli di governo delle banche: un’analisi degli assetti proprietari dei gruppi bancari italiani (Specificity and Models of Banking Governance: An Analysis of the Ownership Structure of the Italian Banking Groups)
Creators: name: Zazzaro, Alberto
Publisher: name: Moneta e Credito
Year: 2012
Subjects: subject: Banking, Governance, Ownership Structure, Ownership, Stockholder
subject: G21, G34, G32

description: This paper aims at discussing the specificity of the banking governance and analysing the ownership structure of the Italian banking groups. Summing up, the theses here argued are: 1) the specificity of the banking activity restricts the role of stockholders, creditors and markets as channels of governance, while magnifying the role of regulation and authorities; 2) it is not possible to define a sole optimal model of banking governance; however, the market in which the bank is called to operate and the interests judged deserving of protection make some models of governance less suitable than others; 3) the models of banking governance currently more diffused in Italy are those of public banks, controlled by banking foundations, and of mutual and co-operative banks; 4) among the larger Italian banking groups there are heavy cross shareholdings, whereas they are weak among the regional banking groups; the sharing by Italian regional banks of larger banks' capital is increasing. JEL Codes: G21, G34, G32 Keywords: Banking, Governance, Ownership Structure, Ownership, Stockholder
description: Moneta e Credito, V. 54, N. 216 (2001)
AGRICULTURAL DIVERSIFICATION IN SMALL ISLAND STATES: THE MARKETING DILEMMA
Creators: name: Clarendon, Hannah
name: Clarendon, Hannah
Publisher: name: Unknown
Year: 1994
Subjects: Agricultural and Food Policy
Farm Management

description: Agricultural diversification has been promulgated by planners to allow the farmer to spread his risk and to increase the foreign exchange earnings of the country. But it has become evident that the mere addition of other crops will not allow either of these two objectives to be met due to the decline in that sector. The decline is bccause some of the crops have attained their maximum growth. Profits to be derived is dwindling with a resultant reduction in the production base and, coupled with low productivity, the income to be derived is even lower. Both traditional and nontraditional export crops are similarly affected. Whereas some of the new crops are still in their growth phase, there is a narrow production base and limited market access. The paper seeks to analyze the diversification thrust in Dominica and offers alternatives for a successful program.
Il cambio dollaro/euro, il prezzo del petrolio e la Banca Centrale Europea (Dollar/Euro Exchange Rate, Oil Price and the European Central Bank)
Creators: name: Sylos Labini, Stefano
Publisher: name: Moneta e Credito
Year: 2012
Subjects: subject: Devaluation, Exchange Rates, Monetary
subject: E58, F31

description: In this paper an analysis on dollar/euro exchange rate, oil price and European Central Bank monetary policy is worked out. Firstly, data on the main variables related with the exchange rate and an equation to explain the variation of the exchange rate in the period March 1998-September 2000 are presented; secondly, the consequences of oil price growth and eurodevaluation on the US and European economies are taken into account; lastly, different policy strategies to stop eurodevaluation are discussed. The European Central Bank strategy, that consists of small increases of the interest rate, is not reaching any result. An alternative strategy is based on innovative public demand, that should be financed by European bonds using "central bank excess funds" as security. Public demand of infrastructures and new technologies should aim at reducing oil dependence and would stimulate growth and sustainable development in Europe, with positive effects on the exchange rate. JEL Codes: E58, F31 Keywords: Devaluation, Exchange Rates, Monetary
description: Moneta e Credito, V. 53, N. 211 (2000)
Gli investimenti di portafoglio nelle economie di mercato emergenti:tendenze, dimensioni e problemi (Portfolio Investment in Emerging Market Economies: Trends, Dimensions and Issues)
Creators: name: Das, Dilip K.
Publisher: name: Moneta e Credito
Year: 2012
Subjects: subject: Capital Flows, Financial Flows, Portfolio
subject: G11, O16, F32, P33

description: Securitised financial flows to emerging market economies have become an important feature of the global capital flows. The principal focus of this paper is on an in-depth analysis of current trends in securitised financial flows. It lays special emphasis on private portfolio equity investment into the emerging market economies. The paper begins with the analysis of the process of stimulation of these flows, and identifies the institutional, structural and non-cyclical factors behind them. One of the points it emphasises is the progressively important role of institutional investors, which is the causal factor behind a significant increase in the quantum of portfolio investment into the emerging market economies. These flows were adversely affected by the financial crises of the 1990s. The subject matter of this paper also includes two of the most important policy issues, namely, the "hot money and cold money" issue and the volatility issue. JEL Codes: G11, O16, F32, P33 Keywords: Capital Flows, Financial Flows, Portfolio
description: Moneta e Credito, V. 53, N. 211 (2000)
Supervisory voltage control scheme for grid-connected wind farms
Creators: name: Ko, Hee-Sang
Publisher: name: University of British Columbia
Year: 2011

description: Modern variable speed wind turbines utilize power electronic converters for the grid connection requirement and to improve performance. Most commonly used converters enable the wind turbines to maintain the required power factor (power factor control) or voltage (local voltage control) at the terminals. However, in many wind farm applications there is a need to control voltage at a specified remote location, which may require the installation of additional compensating devices (transformer tap changers, switched-capacitors, SVCs, etc.) to meet local power quality conditions. This thesis proposes a supervisory control scheme that uses the individual wind turbines to regulate voltage at the required location, i.e., point of common coupling. The proposed approach considers that each turbine may have somewhat different instantaneous wind speeds and real power outputs, and therefore different amounts of reactive power available for achieving the main control objectives. The operating limits of each turbine are also taken into account to ensure that all power electronic converters operate in the allowable region. Since the proposed supervisory scheme is general and can work with different controllers, we investigate several controllers in this thesis. The problem of control design is formulated as a linear matrix inequality. An innovative cost-guaranteed linear-quadratic-regulator-based controller with an observer is proposed and tuned for a range of operating conditions. In this thesis, we apply the proposed supervisory voltage control methodology to a candidate wind farm site on Vancouver Island, BC, Canada, made available through collaboration with Powertech Labs Inc. We have developed a detailed model of the system, using three 3.6 MW wind turbines, to carry out the simulation studies. The proposed control solution is compared with traditional approaches and shown to be very effective during load disturbances and faults. The proposed methodology is also flexible and readily applicable to larger wind farms of different configurations.
Effect of Joule heating in current-driven domain wall motion
Creators: name: Yamaguchi, A.
name: Tanigawa, H.
name: Ono, T.
name: Nasu, S.
name: Miyake, K.
name: Mibu, K.
name: Shinjo, T.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the sample. The sample temperature, when the current-driven domain wall motion occurred, was estimated by measuring the sample resistance during the application of a pulsed-current. The sample temperature was 750 K for the threshold current density of 6.7 x 10^11 A/m2 in a 10 nm-thick Ni81Fe19 wire with a width of 240 nm. The temperature was raised to 830 K for the current density of 7.5 x 10^11 A/m2, which is very close to the Curie temperature of bulk Ni81Fe19. When the current density exceeded 7.5 x 10^11 A/m2, an appearance of a multi-domain structure in the wire was observed by magnetic force microscopy, suggesting that the sample temperature exceeded the Curie temperature.
description: 13 pages, 4 figures
AGRICULTURE AND THE ENVIRONMENT
Creators: name: Thomas, Terrence W.
name: Thomas, Terrence W.
Publisher: name: Unknown
Year: 1994
Subjects: Agricultural and Food Policy
Environmental Economics and Policy
Research and Development/Tech Change/Emerging Technologies

description: This paper examines the evolution of agriculture and its relationship with the environment, through the various phases of its development. It traces man's food- gathering and food-producing activities through various phases of cultural advancement, up to the present time, identifying their impacts on the environment. In each phase of advancement the paper examines the influence of population growth, and science and technology on the evolution of agricultural practice. With the aid of science agriculture has become quite efficient, but still is not without some negative repercussions to the environment (Carson, 1962). For the future, agriculture has to become even more efficient, given projected increases in population. This expository paper notes, though, that growth in agriculture cannot be expected to increase without limits, in view of environmental constraints. Growth therefore has to mean more than just a quantitative increase. The challenge then, is to fashion a meaning of growth consistent with the limits of the natural system and, for food production systems to meet the needs of burgeoning populations in a manner which will not excessively degrade the ecology' which supports them. To meet this challenge, the paper identifies changes we need to make: in the way we apply science to solve problems in agriculture, in our approach to policy formulation and, in the way we organize institutional response to meet future challenges.
Criticality in a Vlasov-Poisson system - a fermionic universality class
Creators: name: Ivanov, A. V.
name: Vladimirov, S. V.
name: Robinson, P. A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A model Vlasov--Poisson system is simulated close the point of marginal stability, thus assuming only the wave-particle resonant interactions are responsible for saturation, and shown to obey the power--law scaling of a second-order phase transition. The set of critical exponents analogous to those of the Ising universality class is calculated and shown to obey the Widom and Rushbrooke scaling and Josephson's hyperscaling relations at the formal dimensionality $d=5$ below the critical point at nonzero order parameter. However, the two-point correlation function does not correspond to the propagator of Euclidean quantum field theory, which is the Gaussian model for the Ising universality class. Instead it corresponds to the propagator for the fermionic {\it vector} field and to the {\it upper critical dimensionality} $d_c=2$. This suggests criticality of collisionless Vlasov-Poisson systems as representative of the {\it universality class} of critical phenomena of {\it a fermionic} quantum field description.
description: 10 pages, 6 figures, Submitted to Phys. Rev. E
On primitive formulation in fluid mechanics and fluid-structure interaction with constant piecewise properties in velocity-potentials of acceleration
Creators: name: Caltagirone, Jean-Paul
name: Vincent, Stephane
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Discrete mechanics makes it possible to formulate any problem of fluid mechanics or fluid-structure interaction in velocity and potentials of acceleration; the equation system consists of a single vector equation and potentials updates. The scalar potential of the acceleration represents the pressure stress and the vector potential is related to the rotational-shear stress. The formulation of the equation of motion can be expressed in the form of a splitting which leads to an exact projection method; the application of the divergence operator to the discrete motion equation exhibits, without any approximation, a Poisson equation with constant coefficients on the scalar potential whatever the variations of the physical properties of the media. The a posteriori calculation of the pressure is made explicitly by introducing at this stage the local density. Two first examples show the interest of the formulation presented on classical solutions of Navier-Stokes equations; similarly as other results obtained with this formulation, the convergence is of order two in space and time for all the quantities, velocity and potentials. This formulation is then applied to a two-phase flow driven by surface tension and partial wettability. The last case corresponds to a fluid-structure interaction problem for which an analytical solution exists.
description: 18 pages, 7 figures, article. Acta Mechanica, 2020
AN EVALUATION OF THE REGIONAL EFFECTS OF NEW CITRUS DEVELOPMENT ON THE ECOLOGICAL INTEGRITY OF WILDLIFE RESOURCES IN SOUTHWEST FLORIDA
Creators: name: Arnold, Calvin E.
name: Mazzotti, Frank J.
name: Arnold, Calvin E.
name: Mazzotti, Frank J.
Publisher: name: Unknown
Year: 1994
Subjects: Agricultural and Food Policy
Environmental Economics and Policy
Resource /Energy Economics and Policy

description: State of the art methods in landscape ecology, impact assessment and environmental planning were applied to evaluate the regional effects of citrus development on the ecological integrity of southwest Florida. The 600,000 ha study area borders the environmentally sensitive Everglades and Big Cypress areas and is prime habitat for the endangered Florida panther. Citrus development alters existing landscape conditions, and there is concern that the scale of the proposed citrus development could effect regional ecological resources. Evaluation of the effects of citrus development focused on listed species, vulnerable habitats and regional biological diversity. The foundation for the conservation of regional ecological integrity will be a mosaic of different intensity land uses.
title: Στα όρια του άυλου και της υλικότητας: Αντιθέσεις και συνέργειες στους εσωτερικούς χώρους των RCR Arquitectes

title: Limits of immateriality and materiality: Contrasts and synergies in the interior spaces of RCR Architects
Creators: name: Αναγνωστοπουλου Γεωργια
Publisher: name: Technical University of Crete
Year: 2024

description: Οι RCR Arquitectes (Rafael Aranda, Carme Pigem, Ramon Vilalta) είναι μια παγκοσμίως γνωστή και πολυβραβευμένη ομάδα Ισπανών αρχιτεκτόνων. Στα έργα τους, για τη διαμόρφωση των εσωτερικών χώρων, χρησιμοποιούνται όσο το δυνατόν λιγότερα υλικά και αντικείμενα, ενώ φαίνεται πως ο σχεδιασμός έχει ως βασική παράμετρο τη χρήση του άυλου (δηλαδή του φωτός, της σκιάς, του αέρα και του κενού). Επίσης, από τη μία πλευρά επιλέγονται διαφανή υλικά με πρόθεση την «αποϋλικοποίηση» της μάζας, από την άλλη όμως, χρησιμοποιούνται αδιαφανή σε σχεδόν ακατέργαστη μορφή, με στόχο την «αυθεντικότητα» και την «αμεσότητα». Μέσα από τις διαφορετικές υλικότητες των εσωτερικών χώρων, ενίοτε οι αρχιτέκτονες έχουν ως στόχο να εντείνεται η αίσθηση του παρόντος στο χρήστη και άλλοτε να γίνεται αισθητή η αποδοχή, η ανάδειξη της φθαρτότητας και του περάσματος του χρόνου. Θα εξεταστεί μέσα από την ανάλυση των εσωτερικών χώρων τριών έργων, πώς οι διαφορετικές προσεγγίσεις στη χρήση των υλικών συγκλίνουν και ανάγονται σε ένα κοινό σχεδιαστικό πλαίσιο, το οποίο συμπεραίνεται ότι είναι  η ύφανση του εξωτερικού μαζί με τον εσωτερικό χώρο και η κατάργηση των ορίων μεταξύ τεχνητού και φυσικού περιβάλλοντος. Από την έρευνα προκύπτει ότι απώτερος στόχος και των δύο σχεδιαστικών προσεγγίσεων (δηλαδή της χρήσης του άυλου και των διαφανειών ή της σχεδόν ακατέργαστης υλικότητας) φαίνεται να είναι ο εξής: η δημιουργία χώρων που προωθούν την ουσιαστική επαφή του ανθρώπου με τη φύση. Επομένως, η παρούσα ερευνητική εργασία θα ασχοληθεί με την αρχική φαινομενική αντίφαση στη χρήση των υλικών που διαμορφώνουν τους εσωτερικούς χώρους των RCR μέσα από τα εξής τρία παραδείγματα: Les Cols Pavilions, Winery Bell Lloc και Les Cols Marquee.