cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Land settlement planning issues in irrigation management: A review of experiences in Sri Lanka.
Creators: name: Stanbury, Pamela
name: Stanbury, Pamela
Publisher: name: Unknown
Year: 1988
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Farm Management
subject: Land Economics/Use
subject: Irrigation management
subject: Settlement
subject: Planning
subject: Land management
subject: Sri Lanka

description: This document is meant to present a framework for analyzing the institutions related to water management in a river basin context. The design of the five-country regional study undertaken by IWMI on “Development of Effective Water Management Institutions” provided a new methodology and a framework for river basin studies. It consists of four key components of diagnostic investigations related to water resources management in a river basin, which are interrelated. These key components are the physical system, water accounting, socioeconomic situation and performance. This study design is given in the Study’s Inception Report of 15 June 1999, and the Methodological Guidelines of 1 October 1999. This document takes one step further, and provides a conceptual framework for analyzing the institutional framework for water resources management in a river basin. The major thrust of this framework for institutional analysis is that the four key areas of diagnostic studies in a river basin are shown to be closely linked to the institutional frame work for integrated water resources management in the context of a river basin.
Complexity and T-invariant of Abelian and Milnor groups, and complexity of 3-manifolds
Creators: name: Pervova, Ekaterina
name: Petronio, Carlo
Publisher: name: arXiv
Year: 2004
Subjects: subject: Geometric Topology (math.GT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F05 (primary), 57M07, 57M27, 20F65 (secondary)

description: We investigate the notion of complexity for finitely presented groups and the related notion of complexity for three-dimensional manifolds. We give two-sided estimates on the complexity of all the Milnor groups (the finite groups with free action on the three-sphere), as well as for all finite Abelian groups. The ideas developed in the process also allow to construct two-sided bounds for the values of the so-called T-invariant (introduced by Delzant) for the above groups, and to estimate from below the value of T-invariant for an arbitrary finitely presented group. Using the results of this paper and of previous ones, we then describe an infinite collection of Seifert three-manifolds for which we can asymptotically determine the complexity in an exact fashion up to linear functions. We also provide similar estimates for the complexity of several infinite families of Milnor groups.
description: 24 pages
S-duality and correlation functions at large R-charge
Creators: name: Hellerman, Simeon
name: Maeda, Shunsuke
name: Orlando, Domenico
name: Reffert, Susanne
name: Watanabe, Masataka
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the ratio of pairs of adjacent correlators of Coulomb-branch operators in $SU(2)$ $\mathcal{N}=2$ SQCD with four flavors within the framework of the Large Quantum Number Expansion. Capitalizing on the order-by-order S-duality invariance of the large-R-charge expansion we compute ab initio the dependence of the leading large-$\mathcal{J}$ behavior on the marginal coupling $τ$ and we find excellent agreement with numerical estimates from localization.
Optimizing Efficacy of Commercial Antibiotics against Tail and Fin Rot Disease in Rainbow Trout Fingerlings by Varying Dosage, Quantities and Time
Creators: name: Timalsina, Prem
name: Rayamajhi, Asha
name: Gautam, Anita
name: Bhusal, Churamani
name: Kunwor, Prakash
Publisher: name: Zenodo
Year: 2024

description: Tail and Fin Rot is one of the most common diseases and fishes are more susceptible to the disease when they are reared in suboptimal rearing conditions resulting stress. It is caused by Aeromonas, Pseudomonas and Vibrio, a Gram-negative bacterium. In this work, commercial antibiotics Doxycycline, Norfloxacin and combined Gentamycin with Tobramycin was tested for its efficacy in decreasing the mortalities caused by naturally-infected Tail and Fin Rot disease in Rainbowtrout fingerlings. At start of the experiment each treatment’s trout fingerlings (avg. 66.77± 18.78, g) showing eroded fins were quantified and had drug efficacy trial through medicated feed of 7 days with 7 days resting period i.e., a period to have fingerlings innate defense mechanisms and repetition of medicated feed.Trout fingerlings with treatment groups T3 having one cycle of medicated feed i.e., Gentamycin 40 mg +Tobramycin 10 mg/ kg fish had significantly lower Cumulative incidence (CI), 1.63 % and disease prevalence rate (DPR), 16.3± 0.071 % followed by treatment group T2, Norfloxacin 50 mg/ kg fish, 3.46± 0.006 % CI and DPR 25.08± 0.048%; and T1, Doxycycline 80 mg/ kg fish CI 3.95± 0.0012 % and DPR 29.82± 0.006% having two drug cycles respectively. The 35th day daily growth rate (g/day) of trout fingerlings had higher growth rate in treatment groups T3 had significantly higher growth rate 1.93± 0.006 followed by T2 1.82±0.009 and T1 0.34± 0.009. No significant survival rate (%) was recorded in treatment groups T3 and T2 while lowest survival 91.18 ± 0.048 % was recorded in treatment group T1. Findings of present study highlights combination of antibiotics Gentamycin and Tobramycin had increased efficacy thus reducing health and economic burden associated with tail and fin infections.
Resource Management with Stochastic Recharge and Environmental Threats
Creators: name: Leizarowitz, Arie
name: Tsur, Yacov
name: Leizarowitz, Arie
name: Tsur, Yacov
Publisher: name: Unknown
Year: 2009
Subjects: subject: Environmental Economics and Policy
subject: Stochastic stock dynamics
subject: event uncertainty
subject: Markov decision process
subject: optimal stationary policy

description: Exploitation diminishes the capacity of renewable resources to with-stand environmental stress, increasing their vulnerability to extreme conditions that may trigger abrupt changes. The onset of such events depends on the coincidence of extreme environmental conditions (environmental threat) and the resource state (determining its resilience). When the former is uncertain and the latter evolves stochastically, the uncertainty regarding the event occurrence is the result of the combined effect of these two uncertain components. We analyzed optimal resource management in such a setting. Existence of an optimal stationary policy is established and long run properties are characterized. A numerical illustration based on actual data is presented.
Non-Markovian quantum dynamics: Extended correlated projection superoperators
Creators: name: Huang, Zhiqiang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The correlated projection superoperator techniques provide a better understanding about how correlations lead to strong non-Markovian effects in open quantum systems. Their superoperators are independent of initial state, which may not be suitable for some cases. To improve this, we develop a new approach, that is extending the composite system before use the correlated projection superoperator techniques. Such approach allows choosing different superoperators for different initial states. We apply these techniques to a simple model to illustrate the general approach. The numerical simulations of the full Schrödinger equation of the model reveal the power and efficiency of the method.
description: 12 pages, 9 figures
Additional file 1 of Effects of a work stress intervention on healthcare use and treatment compared to treatment as usual: a randomised controlled trial in Swedish primary healthcare
Creators: name: Sandheimer, Christine
name: Hedenrud, Tove
name: Hensing, Gunnel
name: Holmgren, Kristina
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1: Table S1. Most frequent care measures* in outpatient care among WSQ intervention group and controls reporting high stress**.
Jets in ep and gammap Scattering at HERA
Creators: name: Schoerner-Sadenius, Thomas
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Recent jet physics results from ep and $γ$p scattering at HERA will be reviewed covering cross-section measurements, the extraction of QCD parameters, the transition region from photoproduction to deep-inelastic scattering and the question of parton evolution in the proton.
description: 6 pages, 3 figures, contribution to Photon 2005, Warsaw, Poland, September 2005, for the H1 and ZEUS collaborations
Experiencias de investigación en comunicación desde el Sur del Ecuador. Caso UTPL
Creators: name: Suing, Abel
Publisher: name: Zenodo
Year: 2021
Subjects: comunicación
investigación
Ecuador
UTPL
Proyecto
docencia
ideales
Universidad
maestría

description: Intervención en IV JORNADAS ACADÉMICAS del http://www.institutocariamanga.edu.ec/
The Arithmetic of Coxeter Permutahedra
Creators: name: Ardila, Federico
name: Beck, Matthias
name: McWhirter, Jodi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05A15, 11P211, 20F55, 51F15, 52A38, 52B20

description: Ehrhart theory measures a polytope P discretely by counting the lattice points inside its dilates P, 2P, 3P, .... We compute the Ehrhart quasipolynomials of the standard Coxeter permutahedra for the classical Coxeter groups, expressing them in terms of the Lambert W function. A central tool is a description of the Ehrhart theory of a rational translate of an integer zonotope.
description: 14 pages, 3 figures, 2 tables
ESTIMATION OF SUPPLY AND DEMAND ELASTICITIES OF CALIFORNIA COMMODITIES
Creators: name: Russo, Carlo
name: Green, Richard D.
name: Howitt, Richard E.
name: Russo, Carlo
name: Green, Richard D.
name: Howitt, Richard E.
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Consumer/Household Economics
subject: Crop Production/Industries
subject: Demand and Price Analysis
subject: Marketing
subject: FOS: Economics and business
subject: Consumer Economics: Empirical Analysis
subject: Agricultural Markets and Marketing
subject: Agriculture: Aggregate Supply and Demand Analysis
subject: Prices

description: The primary purpose of this paper is to provide updated estimates of domestic own-price, cross-price and income elasticities of demand and estimated price elasticities of supply for various California commodities. Flexible functional forms including the Box-Cox specification and the nonlinear almost ideal demand system are estimated and bootstrap standard errors obtained. Partial adjustment models are used to model the supply side. These models provide good approximations in which to obtain elasticity estimates. The six commodities selected represent some of the highest valued crops in California. The commodities are: almonds, walnuts, alfalfa, cotton, rice, and tomatoes (fresh and processed). All of the estimated own-price demand elasticities are inelastic and, in general, the income elasticities are all less than one. On the supply side, all the short-run price elasticities are inelastic. The long-run price elasticities are all greater than their short-run counterparts. The long-run price supply elasticities for cotton, almonds, and alfalfa are elastic, i.e., greater than one. Policy makers can use these estimates to measure the changes in welfare of consumers and producers with respect to changes in policies and economic variables.
Structure and Power in Multilateral Negotiations: An Application to French Water Policy
Creators: name: Simon, Leo K.
name: Goodhue, Rachael E.
name: Rausser, Gordon C.
name: Thoyer, Sophie
name: Morardet, Sylvie
name: Rio, Patrick
name: Simon, Leo K.
name: Goodhue, Rachael E.
name: Rausser, Gordon C.
name: Thoyer, Sophie
name: Morardet, Sylvie
name: Rio, Patrick
Publisher: name: Unknown
Year: 2007
Subjects: subject: Environmental Economics and Policy
subject: Institutional and Behavioral Economics
subject: water
subject: bargaining
subject: negotiations

description: Stakeholder negotiation is an increasingly important policymaking tool. However, relatively little is understood about the relationship between the structure of the negotiating process and the effectiveness with which stakeholders can pursue their individual interests. We apply the Rausser- Simon multilateral bargaining model to a specific negotiation process involving water storage capacity and use in the upper Adour Basin in southwestern France. We focus on a coalition of three stakeholder groups with aligned but distinct interests. In addition to the standard indices of bargaining power—the distribution of political weights (“access”) and players’ utilities if an agreement is not reached, our analysis identifies other less obvious sources of power. First, a coalition member may benefit when his access is reduced if the redistribution increases the access of another coalition member who has a more favorable “strategic location.” Second, the interests of the coalition as a whole will usually, but not always, be advanced if its members cede access to a “spokesman” representing their common interests. However, some members may be adversely affected. Third, restricting the extent to which coalition members can make proposals that further their own individual interests at the expense of other coalition members will usually, but not always, harm the coalition as a whole.
Complex networks of earthquakes and aftershocks
Creators: name: Baiesi, Marco
name: Paczuski, Maya
Publisher: name: arXiv
Year: 2004
Subjects: subject: Geophysics (physics.geo-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We invoke a metric to quantify the correlation between any two earthquakes. This provides a simple and straightforward alternative to using space-time windows to detect aftershock sequences and obviates the need to distinguish main shocks from aftershocks. Directed networks of earthquakes are constructed by placing a link, directed from the past to the future, between pairs of events that are strongly correlated. Each link has a weight giving the relative strength of correlation such that the sum over the incoming links to any node equals unity for aftershocks, or zero if the event had no correlated predecessors. A correlation threshold is set to drastically reduce the size of the data set without losing significant information. Events can be aftershocks of many previous events, and also generate many aftershocks. The probability distribution for the number of incoming and outgoing links are both scale free, and the networks are highly clustered. The Omori law holds for aftershock rates up to a decorrelation time that scales with the magnitude, $m$, of the initiating shock as $t_{\rm cutoff} \sim 10^{βm}$ with $β\simeq 3/4$. Another scaling law relates distances between earthquakes and their aftershocks to the magnitude of the initiating shock. Our results are inconsistent with the hypothesis of finite aftershock zones. We also find evidence that seismicity is dominantly triggered by small earthquakes. Our approach, using concepts from the modern theory of complex networks, together with a metric to estimate correlations, opens up new avenues of research, as well as new tools to understand seismicity.
description: 12 pages, 12 figures, revtex4
Modelling South African grain farmers’ preferences to adopt derivative contracts using discrete choice models
Creators: name: Ueckermann, E.M.
name: Blignaut, J.N.
name: Gupta, Rangan
name: Raubenheimer, J.
name: Ueckermann, E.M.
name: Blignaut, J.N.
name: Gupta, Rangan
name: Raubenheimer, J.
Publisher: name: Unknown
Year: 2008
Subjects: subject: Discrete choice models
subject: micro-analysis of farmers
subject: agricultural markets and marketing

description: This paper applies a discrete choice model to determine specific characteristics that influence South African grain farmers’ preferences to hedge against uncertainties. This is the first empirical study on South African grain producers’ preferences to adopt derivative contracting and is based on the survey data of Grain South Africa for 2006. With the application of separate binary logit models for each major grain commodity, this paper establishes that different grain farmers are significantly heterogeneous. The results also show that grain farmers’ preferences to adopt derivative contracting are mostly influenced by the farmers’ prediction of daily grain prices and trends, farm size and various geographic characteristics. From a policy perspective it has been indicated that food and income insecurity will be reduced if farmers can adopt derivative contracting at large scale since it will enable the producers to produce staple food on a continuous basis at a relatively profitable level.
Competitive performance of global deciduous fruit supply chains: South Africa versus Chile
Creators: name: Mashabela, T.E.
name: Vink, Nick
name: Mashabela, T.E.
name: Vink, Nick
Publisher: name: Unknown
Year: 2008
Subjects: subject: Deciduous fruit
subject: competitiveness
subject: supply chains

description: The South African deciduous fruit industry has experienced difficulties in the past few years. Most deciduous fruit producers have suffered from increased globalisation of markets; trade liberalisation; deregulation of the industry; advances in information technology; changes in consumer preference; over-supply of deciduous fruit in South Africa’s traditional markets and increased global competition, particularly from Chile. These factors have a continuous effect on the competitiveness of the industry and force deciduous fruit producers to position themselves as capable competitors in the global free-market environment. This paper measures the competitive performance of the South African deciduous fruit supply chains relative to those of Chile. An internationally recognised index, the Relative Revealed Comparative Trade Advantage (RTA) index and also data from both Food and Agricultural Organisation (FAO, 2007) and World Trade Organisation (WTO, 2007) are used to measure the competitive performance. The results reveal that South Africa’s deciduous fruit supply chains are shown to be competitive internationally, whereas Chile’s deciduous fruit supply chains are strongly internationally competitive. In most cases, South African fruit products to which value has been added have a competitive disadvantage, contrary to the case in Chile. South African deciduous fruit competitive performance decreases when moving from primary to processed products in the chains, an indication that value-adding opportunities are still limited
Effect of phase relaxation on quantum superpositions in complex collisions
Creators: name: Benet, L.
name: Kun, S. Yu.
name: Qi, Wang
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: Nuclear Theory (nucl-th)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: We study the effect of phase relaxation on coherent superpositions of rotating clockwise and anticlockwise wave packets in the regime of strongly overlapping resonances of the intermediate complex. Such highly excited deformed complexes may be created in binary collisions of heavy ions, molecules and atomic clusters. It is shown that phase relaxation leads to a reduction of the interference fringes, thus mimicking the effect of decoherence. This reduction is crucial for the determination of the phase--relaxation width from the data on the excitation function oscillations in heavy--ion collisions and bimolecular chemical reactions. The difference between the effects of phase relaxation and decoherence is discussed.
description: Extended revised version; 9 pages and 3 colour ps figures
Metallic and semi-metallic <100> silicon nanowires
Creators: name: Rurali, R.
name: Lorente, N.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Silicon nanowires grown along the <100>-direction with a bulk Si core are studied with density functional calculations. Two surface reconstructions prevail after exploration of a large fraction of the phase space of nanowire reconstructions. Despite their energetical equivalence, one of the reconstructions is found to be strongly metallic while the other one is semi-metallic. This electronic-structure behavior is dictated by the particular surface states of each reconstruction. These results imply that doping is not required in order to obtain good conducting Si nanowires.
description: 13 pages, 4 figures; Phys. Rev. Lett., in press
Investigating alternative governance systems for the South African mohair supply chain
Creators: name: Jordaan, Daniel Du Plessis Scheepers
name: Kirsten, Johann F.
name: Jordaan, Daniel Du Plessis Scheepers
name: Kirsten, Johann F.
Publisher: name: Unknown
Year: 2008
Subjects: subject: Mohair
subject: marketing
subject: governance structure
subject: supply chain

description: Mohair is an exclusive natural animal fibre with niche market appeal. It is, however, questionable whether it is inherently suited to a commodity-based marketing system in a marketing environment that requires marketing systems to convey far more information than commodity-based systems do. Historically, mohair has been considered a commodity and the marketing system for mohair has been structured accordingly. It is, however, argued that, the exchange between mohair growers and the buyers of greasy mohair requires increased levels of coordination to govern the exchange in a transaction costs efficient manner. The inefficiencies created by an inappropriate or incomplete marketing system for South African mohair are expected to lead to a loss of consumer value and a loss of potential profit throughout the mohair supply chain if a more coordinated governance structure is not implemented to curb these costs and augment the current spot market exchange.
Measurement of Cross Sections for $D^0 {\bar D}^0$ and $D^+D^-$ Production in $e^+e^-$ Annihilation at $\sqrt{s}=3.773$ GeV
Creators: name: BES Collaboration
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The cross sections for $D^0 {\bar D}^0$ and $D^+D^-$ production at 3.773 GeV have been measured with BES-II detector at BEPC. These measurements are made by analyzing a data sample of about 17.3 $\rm pb^{-1}$ collected at the center-of-mass energy of 3.773 GeV. Observed cross sections for the charm pair production are radiatively corrected to obtain the tree level cross section for $D\bar D$ production. A measurement of the total tree level hadronic cross section is obtained from the tree level $D \bar D$ cross section and an extrapolation of the $R_{uds}$ below the open charm threshold.
description: 7 pages, 2 figures, It was submitted to Physics Letters B in July, 2004
A Descriptive Analysis of Recent Trends in the International Market for Dry Milk Products
Creators: name: Gould, Brian W.
name: Villarreal, Hector J.
name: Gould, Brian W.
name: Villarreal, Hector J.
Publisher: name: Unknown
Year: 2002
Subjects: subject: Demand and Price Analysis
subject: Food Consumption/Nutrition/Food Safety
subject: International Relations/Trade
subject: Dry Milk Products
subject: U.S. Dry Milk Exports
subject: World Trade
subject: Dry Milk Product Prices

description: This Discussion Paper provides a comprehensive description of longer-term trends for exports and world prices of dry milk products. The importance of U.S. exports of dry milk products is suggested by figures in the paper showing that in 2000, 17% of U.S. nonfat dry milk, 35% of dry whey, 47% of lactose, and 11% of whey protein concentrates were exported. The Gould-Villarreal study documents the decline in world trade in nonfat dry milk and expansion of world trade in whole milk powder. The paper suggests that collective product mix decisions of the U.S. dairy industry are partially out-of-sync with world demand. Other implications for U.S. dairy exporters of changes in world demand for dry milk products are discussed.
Sustainability of the US current account deficit: An econometric analysis of the impact of capital inflow on domestic economy
Creators: name: Ansari, Mohammed I.
name: Ansari, Mohammed I.
Publisher: name: Unknown
Year: 2004
Subjects: subject: current account
subject: capital inflow

description: The purpose of this paper is to estimate, by using the recent econometric techniques of unit root testing and Johansen-Juselius cointegration technique (1990), the impact of foreign capital inflow on the volume and efficiency of domestic investment in the United States during the period, 1973-1999. A battery of diagnostic tests is employed to check the validity and robustness of the estimated results. Evidence suggests that capital inflows have had a significant positive effect on the volume of US investment, but the effect on the efficiency of investment has been minimal. These findings imply that, while achieving current account balance is important, it is equally important to sustain and augment the beneficial impact of capital inflow by creating a more conducive investment climate. Given our limited ability to influence current account balance, this seems to be a more pragmatic policy option for dealing with the US current account imbalance.
Managing R&D Risk in Renewable Energy
Creators: name: Rausser, Gordon C.
name: Papineau, Maya
name: Rausser, Gordon C.
name: Papineau, Maya
Publisher: name: Unknown
Year: 2008
Subjects: subject: Public Economics
subject: Research and Development/Tech Change/Emerging Technologies
subject: research
subject: development
subject: renewable resources
subject: risk

description: Federal renewable energy R&D spending is intended, at least in part, to achieve path-breaking commercial breakthroughs in ethanol, hydrogen, solar and wind energy. Recently, the private sector has begun to respond to market opportunities generated by the spike in oil prices and governmental support with significant increases in renewable energy investment. As firms increase their exposure in renewable energy markets, the public sector will be increasingly be pulled in the direction of insuring against the downside risks of clean energy investments. A central question arises in this context: what is the optimal ex-ante allocation of renewable energy R&D investment across the emerging technologies? From the standpoint of societal welfare, the optimal allocation of such support is fundamentally a problem of ex-ante portfolio analysis under risk and uncertainty. This paper presents the components of an ex-ante portfolio analysis of both public and private sector R&D risks in renewable energy.
description: Preliminary Draft
Make Spam Not Art. Guerrilla Spam tra spazio pubblico e privato
Creators: name: Scarpa, Giacomo
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2021
Subjects: L-ART/03 Storia dell'arte contemporanea

description: La cosiddetta Street Art, il fenomeno artistico che più di ogni altro sta contraddistinguendo il nuovo millennio, è in grado di comunicare al passante che vi si imbatte o è destinata a essere considerata pura decorazione ornamentale? Come distinguersi in un calderone sempre più capiente e popolato da protagonisti di fama globale, colori sgargianti, Festival e manifestazioni di vario genere che si susseguono oramai in maniera ciclica col benestare sempre più frequente di politici e curatori interessanti tanto alla facilità e rapidità di realizzazione quanto all’istantaneità del successo mediante la dinamica scatto fotografico – condivisione sui socialnetwork? Siamo certi che chi privilegia il lavoro in strada, spesso privo di tornaconto economico e soggetto a numerosi rischi, sia inconciliabile con i luoghi più istituzionali e deputati all’investitura artistica? Risposte univoche e certe a tali domande sono difficili da dare ma l’analisi ontologica e fenomenologica del collettivo anonimo Guerrilla Spam consente di approcciare un punto di vista originale, se non addirittura unico, in tutto lo scenario mondiale della Street Art, nei quali esempi si ritrova un denominatore comune: l’importanza di aver qualcosa da dire.
Holographic quantum algorithms for simulating correlated spin systems
Creators: name: Foss-Feig, Michael
name: Hayes, David
name: Dreiling, Joan M.
name: Figgatt, Caroline
name: Gaebler, John P.
name: Moses, Steven A.
name: Pino, Juan M.
name: Potter, Andrew C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a suite of "holographic" quantum algorithms for efficient ground-state preparation and dynamical evolution of correlated spin-systems, which require far-fewer qubits than the number of spins being simulated. The algorithms exploit the equivalence between matrix-product states (MPS) and quantum channels, along with partial measurement and qubit re-use, in order to simulate a $D$-dimensional spin system using only a ($D$-1)-dimensional subset of qubits along with an ancillary qubit register whose size scales logarithmically in the amount of entanglement present in the simulated state. Ground states can either be directly prepared from a known MPS representation, or obtained via a holographic variational quantum eigensolver (holoVQE). Dynamics of MPS under local Hamiltonians for time $t$ can also be simulated with an additional (multiplicative) ${\rm poly}(t)$ overhead in qubit resources. These techniques open the door to efficient quantum simulation of MPS with exponentially large bond-dimension, including ground-states of 2D and 3D systems, or thermalizing dynamics with rapid entanglement growth. As a demonstration of the potential resource savings, we implement a holoVQE simulation of the antiferromagnetic Heisenberg chain on a trapped-ion quantum computer, achieving within $10(3)\%$ of the exact ground-state energy of an infinite chain using only a pair of qubits.
description: 13 pages, 9 figures
Are Restaurants Really Supersizing America?
Creators: name: Anderson, Michael L.
name: Matsa, David A.
name: Anderson, Michael L.
name: Matsa, David A.
Publisher: name: Unknown
Year: 2007
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: Health Economics and Policy
subject: economics of regulation
subject: health production
subject: obesity
subject: fat tax

description: While many researchers and policymakers infer from correlations between eating out and body weight that restaurants are a leading cause of obesity, a basic identification problem challenges these conclusions. We exploit the placement of Interstate highways in rural areas to obtain exogenous variation in the effective price of restaurants and examine the impact on body mass. We find no causal link between restaurant consumption and obesity. Analysis of food-intake micro-data suggests that consumers offset calories from restaurant meals by eating less at other times. We conclude that regulation targeting restaurants is unlikely to reduce obesity but could decrease consumer welfare.
description: Replaced with revised version Feb. 24, 2010.
Ferroelectricity in spiral magnets
Creators: name: Mostovoy, Maxim
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It was recently observed that materials showing most striking multiferroic phenomena are frustrated spin-density-wave magnets. We present a simple phenomenological theory, which describes the orientation of the induced electric polarization for various incommensurate magnetic states, its dependence on temperature and magnetic field, and anomalies of dielectric susceptibility at magnetic transitions. We show that electric polarization can be induced at domain walls and that magnetic vortices carry electric charge.
description: 4 pages, 4 figures
Additional file 1 of Race, socioeconomic deprivation, and hospitalization for COVID-19 in English participants of a national biobank
Creators: name: Patel, Aniruddh P.
name: Paranjpe, Manish D.
name: Kathiresan, Nina P.
name: Rivas, Manuel A.
name: Khera, Amit V.
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 1.
Interaction of nanoparticle properties and X-ray analytical techniques
Creators: name: Unterumsberger, Rainer
name: Hönicke, Philipp
name: Kayse, Yves
name: Pollakowski-Herrmann, Beatrix
name: Gholhaki, Saeed
name: Guo, Quanmin
name: Palmer, Richard E.
name: Beckhoff, Burkhard
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In this work, Pt-Ti core-shell nanoparticles (NP) of 2 nm to 3 nm in size and 30000 u \pm 1500 u as specified single particle mass, deposited on flat silicon substrates by means of a mass-selected cluster beam source, were used for the investigation of the modification of the X-Ray Standing Wave (XSW) field intensity with increasing NP surface coverage. The focus of the investigation is on the determination of the range of validity of the undisturbed flat surface approach of the XSW intensity in dependence of the actual coverage rate of the surface. Therefore, the nanoparticles were characterized using reference-free grazing incidence X-ray fluorescence analysis (GIXRF) employing radiometrically calibrated instrumentation. In addition, near-edge X-ray absorption fine structure (NEXAFS) measurements were performed to investigate the binding state of titanium in the core-shell nanoparticles which was found to be amorphous TiO2. The combination of GIXRF measurements and of the calculated XSW field intensities allow for a quantification of the core-shell nanoparticle surface coverage. For six different samples, the peak surface coverage could be determined to vary from 7 % to 130 % of a complete monolayer-equivalent coverage. A result of the current investigation is that core-shell nanoparticles modify the intensity distribution of the XSW field with increasing surface coverage. This experimental result is in line with calculated XSW field intensity distributions at different surface coverages using an effective density approach.
description: 19 pages, 8 figures and 3 tables
Additional file 1 of Decoding the evolutionary response to prostate cancer therapy by plasma genome sequencing
Creators: name: Ramesh, Naveen
name: Sei, Emi
name: Tsai, Pei Ching
name: Shanshan Bai
name: Yuehui Zhao
name: Troncoso, Patricia
name: Corn, Paul G.
name: Logothetis, Christopher
name: Zurita, Amado J.
name: Navin, Nicholas E.
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1. Fig. S1-S6 and Table S1-S3.
Magnetic moments of S-shell pentaquarks in the constituent quark model
Creators: name: Inoue, T.
name: Lyubovitskij, V. E.
name: Gutsche, Th.
name: Faessler, Amand
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the magnetic moments of the recently discovered exotic baryons Theta(+) and Xi(--) and their multiplet partners in the framework of a naive additive quark model. These baryons are set up as pentaquark states where four quarks and a single antiquark are located in their ground state orbit. The pentaquark states are classified as members of the flavor SU(3) octet and antidecuplet with spin-parity J^P = (1/2)^- and (3/2)^-, where we determine the magnetic moments of these pentaquark states.
description: 13 pages, 2 figures, elsart; publication version, 8 pages, 1 figure, ptptex; upload miss corrected
Additional file 2 of Decoding the evolutionary response to prostate cancer therapy by plasma genome sequencing
Creators: name: Ramesh, Naveen
name: Sei, Emi
name: Tsai, Pei Ching
name: Shanshan Bai
name: Yuehui Zhao
name: Troncoso, Patricia
name: Corn, Paul G.
name: Logothetis, Christopher
name: Zurita, Amado J.
name: Navin, Nicholas E.
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 2. Review History.
Enhanced electroweak penguin amplitude in B-->VV decays
Creators: name: Beneke, M.
name: Rohrer, J.
name: Yang, D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss a novel electromagnetic penguin contribution to the transverse helicity amplitudes in B decays to two vector mesons, which is enhanced by two powers of mB/Lambda relative to the standard penguin amplitudes. This leads to unique polarization signatures in penguin-dominated decay modes such as B-->rho K* similar to polarization effects in the radiative decay B-->K*gamma, and offers new opportunities to probe the magnitude and chirality of flavour-changing neutral current couplings to photons.
description: 4 pages, 1 figure
Agriculture and Dairy Production Systems in China: An Overview and Case Studies
Creators: name: Wattiaux, Michel A.
name: Frank, Gary G.
name: Powell, J. Mark
name: Wu, Zhinguo
name: Guo, Yuyuan
name: Wattiaux, Michel A.
name: Frank, Gary G.
name: Powell, J. Mark
name: Wu, Zhinguo
name: Guo, Yuyuan
Publisher: name: Unknown
Year: 2002
Subjects: subject: Consumer/Household Economics
subject: Farm Management
subject: International Development
subject: International Relations/Trade
subject: Productivity Analysis
subject: Chinese Dairy Industry
subject: Dairy Cows in China
subject: Development of the Chinese Dairy Industry
subject: Chinese Dairy Farm Case Studies

description: The Chinese dairy industry is growing rapidly. Since 1980, the rate of increase in dairy cattle in China's dairy industry (+210,000 cows per year) is 1.7 times higher than the rate of decline of dairy cattle in the US dairy industry (-124,000 cows per year). If the current trends do not change, there will be as many dairy cows in China as in the US-approximately 7.45 million cows in 2012. This two-part Discussion Paper presents the context in which the Chinese dairy industry is developing (Part I) and a study of the Dairy Farm systems and case studies of five farms in the Province of Yunnan, the city of Beijing and the province of Heilongjiang (Part II).
Consumer Willingness to Pay for "Second-Generation" Genetically Engineered Products and the Role of Marketing Information
Creators: name: Rousu, Matthew C.
name: Monchuk, Daniel C.
name: Shogren, Jason F.
name: Kosa, Katherine M.
name: Rousu, Matthew C.
name: Monchuk, Daniel C.
name: Shogren, Jason F.
name: Kosa, Katherine M.
Publisher: name: Unknown
Year: 2005
Subjects: subject: auctions
subject: BDM mechanism
subject: cigarettes
subject: field experiment
subject: genetically engineered foods
subject: second-generation

description: Environmental and consumer groups have called for mandatory labeling of genetically engineered (GE) food products in the United States, stating that consumers have the “right to know.” Herein, we use a nonhypothetical field experiment to examine the willingness to pay for GE-labeled products, using the only second-generation GE product currently on the U.S. market-GE cigarettes. Our results suggest consumers pay less for GE-labeled cigarettes when marketing information is absent. But, when presented with marketing information on the attributes of the cigarette, we find no evidence that consumers pay less for GE-labeled cigarettes.
Willingness to Pay for Information Programs about E-Commerce: Results from a Convenience Sample of Rural Louisiana Businesses
Creators: name: Watson, Susan
name: Nwoha, Ogbonnaya John
name: Kennedy, Gary A.
name: Rea, Kenneth
name: Watson, Susan
name: Nwoha, Ogbonnaya John
name: Kennedy, Gary A.
name: Rea, Kenneth
Publisher: name: Unknown
Year: 2005
Subjects: subject: e-commerce
subject: internet
subject: rural businesses
subject: technology
subject: willingness to pay

description: The probability of a business paying various amounts of money for an e-commerce presence ultimately depends on demographic features, experiences with e-commerce from a buyer’s and seller’s perspective, technological expertise, and knowledge of e-commerce opportunities and limitations. Estimating functions to assign probabilities associated with the willingness to pay for an e-commerce presence will assist in forecasting regional likelihood of certain profiles paying various monetary amounts for an e-commerce presence. In addition, if services are provided at no cost by a third party, value to a society will be maximized by selecting profiles with the highest willingness to pay.
A theoretical estimate of the pole-equator temperature difference and a possible origin of the near-surface shear layer
Creators: name: Choudhuri, Arnab Rai
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Convective motions in the deep layers of the solar convection zone are affected by rotation, making the convective heat transport latitude-dependent, but this is not the case in the top layers near the surface. We use the thermal wind balance condition in the deeper layers to estimate the pole-equator temperature difference. Surface observations of this temperature difference can be used for estimating the depth of the near-surface layer within which convection is not affected by rotation. If we require that the thermal wind balance holds in this layer also, then we have to conclude that this must be a layer of strong differential rotation and its characteristics which we derive are in broad agreement with the observational data of the near-surface shear layer.
description: Submitted to Solar Physics
Effects of Federal Risk Management Programs on Optimal Acreage Allocation and Nitrogen Use in a Texas Cotton-Sorghum System
Creators: name: Seo, Sangtaek
name: Mitchell, Paul D.
name: Leatham, David J.
name: Seo, Sangtaek
name: Mitchell, Paul D.
name: Leatham, David J.
Publisher: name: Unknown
Year: 2005
Subjects: subject: crop insurance
subject: extensive margin
subject: intensive margin
subject: loan deficiency payments
subject: revenue insurance

description: We analyze the effects of crop insurance and the Marketing Loan Program on optimal nitrogen use and acreage allocation for a case cotton-sorghum farm in Texas. A mathematical programming model is used to solve for the optimal nitrogen fertilizer rate, crop acreage allocation, coverage level, and price election factor, along with participation in the crop insurance and the Marketing Loan Program for both crops. Results show that depending on the crop and farmer risk aversion, these federal risk management programs increase or decrease optimal fertilizer rates-6% to 3%, increase optimal cotton acreage 94% to 144%, and decrease sorghum acres up to 50%.
A targeted search for repeating fast radio bursts associated with gamma-ray bursts
Creators: name: Palliyaguru, Nipuni T.
name: Agarwal, Devansh
name: Golpayegani, Golnoosh
name: Lynch, Ryan
name: Lorimer, Duncan R.
name: Nguyen, Benjamin
name: Corsi, Alessandra
name: Burke-Spolaor, Sarah
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The origin of fast radio bursts (FRBs) still remains a mystery, even with the increased number of discoveries in the last three years. Growing evidence suggests that some FRBs may originate from magnetars. Large, single-dish telescopes such as Arecibo Observatory (AO) and Green Bank Telescope (GBT) have the sensitivity to detect FRB~121102-like bursts at gigaparsec distances. Here we present searches using AO and GBT that aimed to find potential radio bursts at 11 sites of past $γ$--ray bursts that show evidence for the birth of a magnetar. We also performed a search towards GW170817, which has a merger remnant whose nature remains uncertain. We place $10\,σ$ fluence upper limits of $\approx 0.036$ Jy ms at 1.4 GHz and $\approx 0.063$ Jy ms at 4.5 GHz for AO data and fluence upper limits of $\approx 0.085$ Jy ms at 1.4 GHz and $\approx 0.098$ Jy ms at 1.9 GHz for GBT data, for a maximum pulse width of $\approx 42$ ms. The AO observations had sufficient sensitivity to detect any FRB of similar luminosity to the one recently detected from the Galactic magnetar SGR 1935+2154. Assuming a Schechter function for the luminosity function of FRBs, we find that our non-detections favor a steep power--law index ($α\lesssim-1.0$) and a large cut--off luminosity ($L_0 \gtrsim 10^{42}$ erg/s).
description: 7 pages, 4 figures, accepted for publication in MNRAS
A detailed look at the stellar populations in green valley galaxies
Creators: name: Angthopo, James
name: Ferreras, Ignacio
name: Silk, Joseph
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: $\require{mediawiki-texvc}$The green valley (GV) represents an important transitional state from actively star-forming galaxies to passively evolving systems. Its traditional definition, based on colour, rests on a number of assumptions that can be subject to non-trivial systematics. In Angthopo et al. (2019), we proposed a new definition of the GV based on the 4000$Å$ break strength. In this paper, we explore in detail the properties of the underlying stellar populations by use of ~230 thousand high-quality spectra from the Sloan Digital Sky Survey (SDSS), contrasting our results with a traditional approach via dust-corrected colours. We explore high quality stacked SDSS spectra, and find a population trend that suggests a substantial difference between low- and high-mass galaxies, with the former featuring younger populations with star formation quenching, and the latter showing older (post-quenching) populations that include rejuvenation events. Subtle but measurable differences are found between a colour-based approach and our definition, especially as our selection of GV galaxies produces a cleaner "stratification" of the GV, with more homogeneous population properties within sections of the GV. Our definition based on 4000$Å$ break strength gives a clean representation of the transition to quiescence, easily measurable in the upcoming and future spectroscopic surveys.
description: 20 pages, 13+3 figures. Accepted for publication in MNRAS
Mass Renormalization in Non-relativistic Quantum Electrodynamics with Spin 1/2
Creators: name: Hiroshima, F.
name: Ito, K. R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The effective mass $\mass$ of the the Pauli-Fierz Hamiltonain with ultraviolet cutoff $Λ$ and the bare mass $m$ in nonrelativistic QED with spin 1/2 is investigated. Analytic properties of $\mass$ in coupling constant $e$ are shown and explicit forms of constants $a_1(Λ/m)$ and $a_2(Λ/m)$ depending on $Λ/m$ such that $$\mass/m =1 + a_1(Λ/m) e^2+ a_2(Λ/m) e^4+ {\mathcal O}(e^6)$$ are given. It is shown that the spin interaction enhances the effective mass and that there exist strictly positive constants $b_1,b_2, c_1$ and $c_2$ such that $$\d b_1\leq \lim_{Λ\to\infty} \frac{a_1(\Lamdda/m)}{\log (Λ/m)}\leq b_2, c_1\leq \lim_{Λ\to\infty} \frac{a_2(Λ/m)}{(Λ/m)^2}\leq -c_2.$$ In particular $a_2(Λ/m)$ does not diverges as $\pm [\log(Λ/m)]^2$ but $-(Λ/m)^2$.