cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Squeezing and multimode entanglement of surface acoustic wave phonons
Creators: name: Andersson, Gustav
name: Jolin, Shan W.
name: Scigliuzzo, Marco
name: Borgani, Riccardo
name: Tholén, Mats O.
name: Hernández, J. C. Rivera
name: Shumeiko, Vitaly
name: Haviland, David B.
name: Delsing, Per
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Exploiting multiple modes in a quantum acoustic device could enable applications in quantum information in a hardware-efficient setup, including quantum simulation in a synthetic dimension and continuous-variable quantum computing with cluster states.We develop a multimode surface acoustic wave (SAW) resonator with a superconducting quantum interference device (SQUID) integrated in one of the Bragg reflectors. The interaction with the SQUID-shunted mirror gives rise to coupling between the more than 20 accessible resonator modes. We exploit this coupling to demonstrate two-mode squeezing of SAW phonons, as well as four-mode multipartite entanglement. Our results open avenues for continuous-variable quantum computing in a compact hybrid quantum system.
D1.1: Collection of Case Studies of institutional adoption of CS
Creators: name: Abril Herrera
name: Haklay, Muki
Publisher: name: Zenodo
Year: 2021
Subjects: Institutional Adoption of Citizen Science
Citizen Science case studies
Institutional Changes

description: The current document, titled “Collection of Case Studies of institutional adoption of CS” has been developed within the framework of the TIME4CS project which is funded by the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement No 101006201. The main objective of the document is to report on the case study analysis of institutional adoption of Citizen Science initiatives in Research Performing Organisations (RPOs) around the globe. To this end, the report is divided in four main sections: the first section presents a brief literature review of the state-of the-art of adoption of Citizen Science within RPOs; the second section introduces the process of assessing institutional change in RPOs through the use of the Qualitative Comparative Analysis technique; a third section shows the data input from the case studies; and a four section introduces the QCA analysis. The report is providing details of the assessment of 30 organisations, which are evaluated across eight domains of indicators that can explain the change. These domains are: · the number of citizen science projects and the disciplines in which they occur; · the existence and participation in internal and external citizen science networks; · provision of citizen science training; · the role of citizen science champions; · the existence of an institutional plan in the area of citizen science; · the existence of an organisational citizen science coordinator; · the type of funding that supports citizen science; · and the existence of technical tools to support citizen science that were developed in the RPOs. Within this report, we provide the full analysis of the 30 organisations and a preliminary analysis of the results. We show that QCA analysis can help in identifying that in disciplinary terms, it is likely to be a multi-faculty support with a role of the natural sciences, humanities, and social sciences to lead to institutional change. Further analysis on the data that was collected is outlined.
FHI-aims File Format Description: geometry.in
Creators: name: Blum, Volker
Publisher: name: figshare
Year: 2020
Subjects: Computational Chemistry

description: This file provides a basic description of the "geometry.in" file format, used to define the atomic structure of molecules solids, nanostructures, surfaces, etc. in the FHI-aims electronic code. This file format can be interpreted by several utilities outside of the FHI-aims code as well.
Terrestrial Planet Formation I. The Transition from Oligarchic Growth to Chaotic Growth
Creators: name: Kenyon, Scott J.
name: Bromley, Benjamin C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use a hybrid, multiannulus, n-body-coagulation code to investigate the growth of km-sized planetesimals at 0.4-2 AU around a solar-type star. After a short runaway growth phase, protoplanets with masses of roughly 10^26 g and larger form throughout the grid. When (i) the mass in these `oligarchs' is roughly comparable to the mass in planetesimals and (ii) the surface density in oligarchs exceeds 2-3 g/sq cm at 1 AU, strong dynamical interactions among oligarchs produce a high merger rate which leads to the formation of several terrestrial planets. In disks with lower surface density, milder interactions produce several lower mass planets. In all disks, the planet formation timescale is roughly 10-100 Myr, similar to estimates derived from the cratering record and radiometric data.
description: Astronomical Journal, accepted; 22 pages + 15 figures in ps format; eps figures at http://cfa-www.harvard.edu/~kenyon/dl/ revised version clarifies evolution and justifies choice of promotion masses
Reinforcement Meta-Learning for Interception of Maneuvering Exoatmospheric Targets with Parasitic Attitude Loop
Creators: name: Gaudet, Brian
name: Furfaro, Roberto
name: Linares, Richard
name: Scorsoglio, Andrea
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We use Reinforcement Meta-Learning to optimize an adaptive integrated guidance, navigation, and control system suitable for exoatmospheric interception of a maneuvering target. The system maps observations consisting of strapdown seeker angles and rate gyro measurements directly to thruster on-off commands. Using a high fidelity six degree-of-freedom simulator, we demonstrate that the optimized policy can adapt to parasitic effects including seeker angle measurement lag, thruster control lag, the parasitic attitude loop resulting from scale factor errors and Gaussian noise on angle and rotational velocity measurements, and a time varying center of mass caused by fuel consumption and slosh. Importantly, the optimized policy gives good performance over a wide range of challenging target maneuvers. Unlike previous work that enhances range observability by inducing line of sight oscillations, our system is optimized to use only measurements available from the seeker and rate gyros. Through extensive Monte Carlo simulation of randomized exoatmospheric interception scenarios, we demonstrate that the optimized policy gives performance close to that of augmented proportional navigation with perfect knowledge of the full engagement state. The optimized system is computationally efficient and requires minimal memory, and should be compatible with today's flight processors.
description: Under Consideration for publication in Journal of Spacecraft and Rockets. arXiv admin note: text overlap with arXiv:1906.02113
Register file architecture optimization in a coarse-grained reconfigurable array
Creators: name: Kwok, Zion Siu-On
Publisher: name: University of British Columbia
Year: 2009

description: This thesis investigates the impact of the global and local register file architecture on a reconfigurable system based on the ADRES architecture. The register files consume a significant amount of area on the reconfigurable device, and their architecture has a strong impact on the performance. We found that the global registers should be tightly connected to as many functional units as possible, while the connection of the local register files to their neighbours is less critical. We found that the global register file should contain 14 registers, while each local register file should only contain two registers. We used these results to propose two new architectures that demonstrate between -33% and 383% higher instructions per cycle per unit area compared to the original 4x4 and 8x8 array architectures, with 56% and 88% average improvement over a set of benchmarks for the new 4x4 and 8x8 array architectures, respectively.
An Unsupervised Approach to Ultrasound Elastography with End-to-end Strain Regularisation
Creators: name: Delaunay, Rémi
name: Hu, Yipeng
name: Vercauteren, Tom
Publisher: name: arXiv
Year: 2020
Subjects: subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Quasi-static ultrasound elastography (USE) is an imaging modality that consists of determining a measure of deformation (i.e.strain) of soft tissue in response to an applied mechanical force. The strain is generally determined by estimating the displacement between successive ultrasound frames acquired before and after applying manual compression. The computational efficiency and accuracy of the displacement prediction, also known as time-delay estimation, are key challenges for real-time USE applications. In this paper, we present a novel deep-learning method for efficient time-delay estimation between ultrasound radio-frequency (RF) data. The proposed method consists of a convolutional neural network (CNN) that predicts a displacement field between a pair of pre- and post-compression ultrasound RF frames. The network is trained in an unsupervised way, by optimizing a similarity metric be-tween the reference and compressed image. We also introduce a new regularization term that preserves displacement continuity by directly optimizing the strain smoothness. We validated the performance of our method by using both ultrasound simulation and in vivo data on healthy volunteers. We also compared the performance of our method with a state-of-the-art method called OVERWIND [17]. Average contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR) of our method in 30 simulation and 3 in vivo image pairs are 7.70 and 6.95, 7 and 0.31, respectively. Our results suggest that our approach can effectively predict accurate strain images. The unsupervised aspect of our approach represents a great potential for the use of deep learning application for the analysis of clinical ultrasound data.
description: Accepted at MICCAI 2020
The Impact of Human Capital on Farm Operator Household Income
Creators: name: El-Osta, Hisham S.
name: El-Osta, Hisham S.
Publisher: name: Unknown
Year: 2011
Subjects: subject: Agricultural Finance
subject: Consumer/Household Economics
subject: Farm Management
subject: Financial Economics
subject: Labor and Human Capital
subject: farm households
subject: ARMS data
subject: quantile regression
subject: government payments
subject: human capital
subject: off-farm wages and salaries

description: Data from the 2006 Agricultural Resource Management Survey and multivariate regression procedures are used to examine the role of human capital in impacting the incomes of farm households. The paper uses an “adjusted” concept of income where government payments are subtracted from total household income thus allowing for the utilization of government payments as a potential control variable in the regression models. Findings indicate a significant and positive role for higher education except for farm households at the very lower and upper ends of the income distribution.
Reaction-diffusion with a time-dependent reaction rate: the single-species diffusion-annihilation process
Creators: name: Turban, L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the single-species diffusion-annihilation process with a time-dependent reaction rate, lambda(t)=lambda_0 t^-omega. Scaling arguments show that there is a critical value of the decay exponent omega_c(d) separating a reaction-limited regime for omega > omega_c from a diffusion-limited regime for omega < omega_c. The particle density displays a mean-field, omega-dependent, decay when the process is reaction limited whereas it behaves as for a constant reaction rate when the process is diffusion limited. These results are confirmed by Monte Carlo simulations. They allow us to discuss the scaling behaviour of coupled diffusion-annihilation processes in terms of effective time-dependent reaction rates.
description: 11 pages, 9 figures, minor corrections
Supplementary Tables and Figures from Climate drivers of plague epidemiology in British India, 1898–1949
Creators: name: Tennant, Warren S. D.
name: Tildesley, Mike J.
name: Spencer, Simon E. F.
name: Keeling, Matt J.
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Health Care
subject: Diseases
subject: 111706 Epidemiology
subject: FOS: Health sciences

description: Supplementary tables of full model results and an assortment of supplementary figures referred to throughout the main text.
Beyond Optimizing for Clicks: Incorporating Editorial Values in News Recommendation
Creators: name: Lu, Feng
name: Dumitrache, Anca
name: Graus, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: Computation and Language (cs.CL)
subject: Human-Computer Interaction (cs.HC)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: With the uptake of algorithmic personalization in the news domain, news organizations increasingly trust automated systems with previously considered editorial responsibilities, e.g., prioritizing news to readers. In this paper we study an automated news recommender system in the context of a news organization's editorial values. We conduct and present two online studies with a news recommender system, which span one and a half months and involve over 1,200 users. In our first study we explore how our news recommender steers reading behavior in the context of editorial values such as serendipity, dynamism, diversity, and coverage. Next, we present an intervention study where we extend our news recommender to steer our readers to more dynamic reading behavior. We find that (i) our recommender system yields more diverse reading behavior and yields a higher coverage of articles compared to non-personalized editorial rankings, and (ii) we can successfully incorporate dynamism in our recommender system as a re-ranking method, effectively steering our readers to more dynamic articles without hurting our recommender system's accuracy.
description: To appear in UMAP 2020
On the Lefschetz standard conjecture for Lagrangian covered hyper-Kähler varieties
Creators: name: Voisin, Claire
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We investigate the Lefschetz standard conjecture for degree $2$ cohomology of hyper-Kähler manifolds admitting a covering by Lagrangian subvarieties. In the case of a Lagrangian fibration, we show that the Lefschetz standard conjecture is implied by the SYZ conjecture characterizing classes of divisors associated with Lagrangian fibration. In dimension $4$, we consider the more general case of a Lagrangian covered fourfold $X$, and prove the Lefschetz standard conjecture in degree $2$, assuming $ρ(X)=1$ and $X$ is general in moduli. Finally we discuss various links between Lefschetz cycles and the study of the rational equivalence of points and Bloch-Beilinson type filtrations, giving a general interpretation of a recent intriguing result of Marian and Zhao.
description: Final version
Exact solution of the $A^{(1)}_{n-1}$ trigonometric vertex model with non-diagonal open boundaries
Creators: name: Yang, Wen-Li
name: Zhang, Yao-Zhong
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: The $A^{(1)}_{n-1}$ trigonometric vertex model with {\it generic non-diagonal} boundaries is studied. The double-row transfer matrix of the model is diagonalized by algebraic Bethe ansatz method in terms of the intertwiner and the corresponding face-vertex relation. The eigenvalues and the corresponding Bethe ansatz equations are obtained.
description: Latex file, 25 pages; V2: minor typos corrected, the version appears in JHEP
Estimation of cross and machine direction variations using recursive wavelet filtering
Creators: name: Aslani-Mahmoodi, Setareh
Publisher: name: University of British Columbia
Year: 2009

description: Paper machine data taken from scanning sensors are used to assess the quality of the two-dimensional sheet. Scanned data normally include significant noise components as well as aliasing effects resulting from the irregular sampling pattern of the scanning sensor. The separation of the cross machine (CD) variations from those in the machine direction (MD) is important for control purposes, but is compromised by interaction of scanning patterns with MD disturbance frequencies. Different filtering techniques have been proposed in the past. In this work some methods are presented to remove the noise, mitigate aliasing, and provide accurate CD profiles. The high frequency machine direction (MD) process variations present in the data, should not be allowed to distort the cross direction (CD) variations as far as possible, for the purpose of CD control. The filtering method presented here uses wavelet filtering for noise reduction, and takes advantage of a bootstrap recursive scheme for successively improving estimates of MD and CD variations in the scanned data, and separating MD and CD profiles. The approach also uses periodic sampling theory for interpolating the process variations, and recognizing the change in sampling pattern that occurs at different CD positions. Some sets of simulated data as well as several industrial data have been used to test the proposed algorithm. The advantage of using the simulated data is that in this case the true variations are known. The aliasing effect of the MD profile, especially for periodic MD signals of a period close to that of the scan rate, is another issue in filtering scanned data effectively. A method is presented to detect the aliased MD frequency, in the.filtered profiles. This test may provide guidelines for changing the scan time if necessary.
On the density for sums of independent exponential, Erlang and gamma variates
Creators: name: Levy, Edmond
Publisher: name: arXiv
Year: 2020
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: This paper re-examines the density for sums of independent exponential, Erlang and gamma random variables. By using a divided difference perspective, the paper provides a unified approach to finding closed-form formulae for such convolutions. In particular, the divided difference perspective for sums of Erlang variates suggests a new approach to finding the density for sums of independent gamma variates using fractional calculus.
description: 21 pages
D3.4: Report on TIME4CS Knowledge Transfer from Front-Runners to Implementers
Creators: name: Mondardini, Rosy
name: Roffler, Ursina
Publisher: name: Zenodo
Year: 2021
Subjects: mutual learning
knowledge transfer
citizen science
workshops

description: The current document, titled ’Report on TIME4CS Knowledge Transfer from Front-Runners to Implementers’, has been developed within the framework of the TIME4CS project which is funded by the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement No 101006201. The purpose of this Deliverable is to report on the knowledge transfer activities that were organised under Task 3.2. This task ensured the direct and continuous communication and active knowledge transfer and brokerage going from Front-Runners (FRs) to Implementers. To do so, each FR – namely Aarhus University (AU), University College London (UCL), and Competence Center Citizen Science Zurich (CC-CS) – organised one workshop covering one (in the case of CC-CS two) of the four Intervention Areas (IAs). Representatives of each implementing Research Performing Organisation (RPO) attended these workshops. Due to Covid-19 restrictions these workshops were held virtually via Zoom. The three workshops were the following ones: · 1. Workshop: IA Education & Awareness, led by AU on Tuesday, October 19th, 12–2pm CEST · 2. Workshop: IA Research, led by UCL on Wednesday, October 27th, 12–2pm CEST · 3. Workshop: IA Infrastructure & IA Policy, led by CC-CS on Wednesday, November 3rd, 12–2pm CEST These workshops are seen as sort of kick-off of further support from FRs for the Implementers throughout the project activities, ensuring Implementers to maintain privileged contacts with and access to the FR’s know-how, lessons learned and success factors to enhance Implementers’ capacity based on their concrete needs. Due to the Covid-19 pandemic restrictions, the TIME4CS consortium decided to hold the workshops online (it was originally planned as one full day workshops) and split it into three sessions.
Phosphorus Imbalances in the Chesapeake Bay Watershed: Can Forestland and Manure Processing Facilities Be the Answers?
Creators: name: Catma, Serkan
name: Collins, Alan R.
name: Catma, Serkan
name: Collins, Alan R.
Publisher: name: Unknown
Year: 2011
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: mathematical programming
subject: water quality
subject: animal manure
subject: composting

description: A mixed-integer linear programming model was formulated to minimize the cost of transport and processing of excess manure in the Chesapeake Bay watershed. The results showed that primarily poultry manure was moved out of surplus counties for land application or processing. In the base model, annual cost was more than $350 million, with the bulk of the cost arising from construction of energy facilities for poultry manure. Forestland application of poultry manure had the lowest average cost, and more forestland than agricultural land was used for manure application. The lowest cost scenario was $127 million annually when constraints were removed to expand manure application on agricultural land and allow unlimited construction of composting facilities. Such a low-cost solution could not realistically be implemented without further development of markets for compost.
title: Solid-phase synthesis of recyclable phosphorus donor ligands for the development of immobilized transition-metal catalyst libraries
Creators: name: Konrath, Robert
Publisher: name: University of St Andrews
Year: 2019

description: Phosphorus-based ligands play a key role in a plethora of transition-metal catalyzed transformations. To date, only a few privileged ligand motifs have been developed for high performance application in a wide range of reactions. Despite the advances in rational design of highly selective phosphorus-based ligands in (asymmetric) homogeneous catalysis, synthetic approaches through trial-and-error remain the most common methodologies for the discovery of new powerful catalysts. High throughput experimentation has been embraced by both academia and industry to accelerate catalyst optimization requiring accesses to large and diverse ligand libraries. There is, however, still a lack of efficient combinatorial techniques enabling the synthesis and screening of vast phosphorus-based ligand libraries. Solid-phase synthesis (SPS) offers an useful tool towards the parallel synthesis of large multidentate ligand libraries. While being covalently bound to an insoluble polymeric support, a stepwise preparation of modular ligands can be realized via systematic variation of various building blocks. Moreover, purification procedures can be greatly simplified when employing this SPS approach, often requiring only easy filtration steps. Another advantage offered by immobilization of homogeneous catalysts on insoluble supports is the facilitated catalyst recovery and recycling as catalyst separation remains one of the major problems in applied homogenous catalysis. Consequently, resin-bound catalysts represent promising candidates for application in continuously operated processes. This thesis presents the efficient preparation of multidentate phosphorus ligand libraries using as solid-phase synthesis approach. Chapter 2 describes the modular access to a large and highly diverse supported phosphine-phosphite ligand library for application in asymmetric hydrogenation of enamides. The synthesis of a supported PNP pincer ligand library for application in ester reduction underlines the versatility of this SPS approach (chapter 3). Furthermore, the combinatorial ligand synthesis on a solid support has been successfully transferred to chiral PNP-type ligands (chapter 4). In chapter 5, a series of supported tripodal phosphorus ligand-based ruthenium complexes has been employed in nitrile hydrogenation providing tunable product selectivity by a simple change in the catalyst structure. Ultimately, the recovery and reusability of these heterogenized homogeneous catalysts has been investigated under batch and continuous flow conditions.
Interstellar Grains -- The 75th Anniversary
Creators: name: Li, Aigen
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The year of 2005 marks the 75th anniversary since Trumpler (1930) provided the first definitive proof of interstellar grains by demonstrating the existence of general absorption and reddening of starlight in the galactic plane. This article reviews our progressive understanding of the nature of interstellar dust.
description: invited review article for the "Light, Dust and Chemical Evolution" conference (Gerace, Italy, 26--30 September 2004), edited by F. Borghese and R. Saija, 2005, in press
CARACTERIZAÇÃO E ANÁLISE DE SUSTENTABILIDADE DAS PROPRIEDADES TÍPICAS NO OESTE DE SÃO PAULO
Creators: name: Ribeiro, Renato Garcia
name: Osaki, Mauro
name: Alves, Lucilio Rogerio Aparecido
name: Ballaminut, Carlos Eduardo Carneiro
name: Barros, Geraldo Sant'Ana De Camargo
name: Ribeiro, Renato Garcia
name: Osaki, Mauro
name: Alves, Lucilio Rogerio Aparecido
name: Ballaminut, Carlos Eduardo Carneiro
name: Barros, Geraldo Sant'Ana De Camargo
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural Finance
subject: Farm Management
subject: propriedade típica
subject: sustentabilidade do negócio
subject: fluxo de caixa da propriedade
subject: typical farm
subject: sustainable business and farm cash-flow

description: A dinâmica do agronegócio é caracterizada por momentos de alta e de baixa. O ciclo de preço e a variação da produtividade das atividades presentes na propriedade determinam a rentabilidade e a sustentabilidade do negócio. Assim, o presente trabalho tem o objetivo de caracterizar a propriedade típica dos produtores da região de Assis (SP) e analisar sua sustentabilidade e fluxo de caixa. O estudo de caso descreveu as características de quatro propriedades típicas da região, revelando similaridade na adoção tecnológica e no módulo rural. Quanto ao sistema de produção, as propriedades apresentaram diferentes estratégias para garantir a rentabilidade e a sustentabilidade do negócio. A análise do fluxo de caixa e a análise da sustentabilidade da propriedade são utilizadas como ferramentas básicas para possíveis tomadas de decisões por parte dos produtores agrícolas. Em geral, a diversificação da propriedade viabiliza uma redução da sazonalidade do fluxo de caixa do negócio. -------------------------------------------------The agribusiness dynamics is characterized by time of high and low. The cycle of price and variation in the yield of activities in the property determine the profitability and sustainability of the business. Thus, the present study aims to characterize the typical property of the producers of the region de Assis (SP) and analyze the sustainability and cash flow of rural property. The case study described the characteristic properties of four typical of the region, showing similarity in adopting technology in rural module. Regarding the production system, the properties had different strategies to ensure the profitability and sustainability of the business. The analysis of cash flow and analysis of the sustainability of the property are used as basic tools for possible decision making on the part of farmers. In general, the diversification of the property is viable when it reduces the seasonality in cash flow of the business.
Chemotactic Collapse and Mesenchymal Morphogenesis
Creators: name: Escudero, Carlos
Publisher: name: arXiv
Year: 2004
Subjects: subject: Cell Behavior (q-bio.CB)
subject: Analysis of PDEs (math.AP)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Biological sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We study the effect of chemotactic signaling among mesenchymal cells. We show that the particular physiology of the mesenchymal cells allows one-dimensional collapse in contrast to the case of bacteria, and that the mesenchymal morphogenesis represents thus a more complex type of pattern formation than those found in bacterial colonies. We finally compare our theoretical predictions with recent in vitro experiments.
The morphology of nodal lines-random waves versus percolation
Creators: name: Foltin, Georg
name: Gnutzmann, Sven
name: Smilansky, Uzy
Publisher: name: arXiv
Year: 2004
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Other Condensed Matter (cond-mat.other)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper we investigate the properties of nodal structures in random wave fields, and in particular we scrutinize their recently proposed connection with short-range percolation models. We propose a measure which shows the difference between monochromatic random waves, which are characterized by long-range correlations, and Gaussian fields with short-range correlations, which are naturally assumed to be better modelled by percolation theory. We also study the relevance of the quantities which we compute to the probability that nodal lines are in the vicinity of a given reference line.
description: 10 pages, 5 figures (incl. one coloured figure), published version
The Effect of Solar Wind Expansion and Non-Equilibrium Ionization on the Broadening of Coronal Emission Lines
Creators: name: Gilly, Chris R.
name: Cranmer, Steven R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: When observing spectral lines in the optically-thin corona, line-of-sight (LOS) effects can strongly affect the interpretation of the data, especially in regions just above the limb. We present a semi-empirical forward model, called GHOSTS, to characterize these effects. GHOSTS uses inputs from several other models to compute non-equilibrium ionization states (which include the solar-wind freezing-in effect) for many ions. These are used to generate ensembles of simulated spectral lines that are examined in detail, with emphasis on: (1) relationships between quantities derived from observables and the radial variation of the observed quantities, (2) the behavior of thermal and non-thermal components of the line width, and (3) relative contributions of collisionally excited and radiatively scattered photons. We find that rapidly changing temperatures in the low corona can cause ion populations to vary dramatically with height. This can lead to line-width measurements that are constant with height (a "plateau" effect) even when the temperature is increasing rapidly, as the plane-of-sky becomes evacuated and the foreground/background plasma dominates the observation. We find that LOS effects often drive the velocity width to be close to the plane-of-sky value of the wind speed, despite it flowing perpendicularly to the LOS there. The plateau effect can also cause the non-thermal component of the line width to greatly exceed the solar wind velocity at the observation height. Lastly, we study how much of the LOS is significant to the observation, and the importance of including continuum in the solar spectrum when computing the radiatively scattered emission.
description: 28 pages, 17 figures. Accepted for publication by the ApJ on 8/20/2020
Relativistic Harmonic Oscillator with Spin Symmetry
Creators: name: Ginocchio, Joseph N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The eigenfunctions and eigenenergies for a Dirac Hamiltonian with equal scalar and vector harmonic oscillator potentials are derived. Equal scalar and vector potentials may be applicable to the spectrum of an antinucleion imbedded in a nucleus. Triaxial, axially deformed, and spherical oscillator potentials are considered. The spectrum has a spin symmetry for all cases and, for the spherical harmonic oscillator potential, a higher symmetry analogous to the SU(3) symmetry of the non-relativistic harmonic oscillator is discussed.
FATORES DETERMINANTES DA OFERTA TURÍSTICA DO MUNICÍPIO DE ILHÉUS (BAHIA), NA ALTA ESTAÇÃO DO ANO DE 2006
Creators: name: Cerqueira, Cristiane Aparecida De
name: Freire, Carla Regina Ferreira
name: Cerqueira, Cristiane Aparecida De
name: Freire, Carla Regina Ferreira
Publisher: name: Unknown
Year: 2008
Subjects: subject: Community/Rural/Urban Development
subject: recursos naturais
subject: turistas
subject: análise fatorial
subject: natural resources
subject: tourist
subject: factorial analysis

description: Este artigo tem por objetivo estimar os fatores determinantes da oferta turística do município de Ilhéus, na alta estação do ano de 2006. Fundamentado no conceito de que a oferta turística é subdividida em três categorias, atrativos, equipamentos e serviços e infra-estrutura, procurou-se avaliar estes componentes solicitando aos turistas, presentes nas principais praias, notas que representassem seu nível de satisfação. Os dados foram analisados através da estatística descritiva e por meio da análise fatorial. Os resultados indicam que os atrativos naturais e a hospitalidade agradaram, registrando as maiores notas médias. Por outro lado, as manifestações populares, os serviços de receptivo e as diversões noturnas destacam-se como os mais criticados. Oito fatores foram extraídos, responsáveis por, aproximadamente, 60% da variância total dos dados. Estes fatores corroboram os entraves e as potencialidades do destino. Espera-se, com os resultados apresentados, auxiliar o planejamento da atividade de forma que as decisões de investimento sejam acertadas e venham promover consolidação do setor e o desenvolvimento sustentável do município.-----------------------------------------------This article has the objective of to esteem the determinative factors of offers tourist of the city of Ilhéus, in the high station of the year of 2006. Based on the concept of that the tourist offer is subdivided in three categories, attractive, equipment and services and infrastructure, these components were evaluated requesting to the tourists, standing on the main beaches, notes that represented their level of satisfaction. The data had been analyzed through the descriptive statistics and by means of the factorial analysis. The results indicate that natural attractive and the hospitality had pleased, registering biggest average notes. On the other hand, the popular manifestations, the receptive services and the nocturnal diversion are distinguished as the most criticized. Eight factors had been extracted, responsible for, approximately, 60% of the total variance of the data. These factors corroborate the impediments and the potentialities of the destination. Is is expected, with the presented results, to assist the planning of the activity of form that the investment decisions are made right and promote consolidation of the sector and the sustainable development of the city.
Shock wave formation in Rosenau's extended hydrodynamics
Creators: name: Escudero, Carlos
Publisher: name: arXiv
Year: 2004
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the extended hydrodynamics proposed by Philip Rosenau [Phys. Rev. A 40, 7193 (1989)] in the context of a regularization of the Chapman-Enskog expansion. We are able to prove that shock waves appear in finite time in Rosenau's extended Burgers' equation, and we discuss the physical implications of this fact and its connection with a possible extension of hydrodynamics to the short wavelength domain.
ELEMENTOS PARA A ANÁLISE DAS DEFESAS DE INTERESSES ARTICULADOS AO COMPLEXO AGROINDUSTRIAL DO FUMO
Creators: name: Prieb, Rita Pauli
name: Zanella, Cristine Koehler
name: Prieb, Rita Pauli
name: Zanella, Cristine Koehler
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Grupos de interesse
subject: Complexo Agroindustrial do Fumo
subject: Políticas públicas
subject: Interest groups
subject: Tobacco Agribusiness
subject: Public Policies

description: O artigo apresenta as contribuições do Direito, Ciência Política e Agricultura Sociológica para compreender melhor as relações que se estabelecem entre os atores do CAI do fumo e o Estado brasileiro no que concerne à formulação de políticas públicas para o referido setor. Para tanto, num primeiro momento esboça-se o quadro explicativo das articulações de interesses a partir desses aportes interdisciplinares. Posteriormente passa-se ao estudo mais pontual dos atores e articulações de interesse no âmbito do setor fumageiro no Brasil. Tal abordagem permitiu constatar que as análises existentes fornecem bons elementos para a compreensão da articulação de interesses no CAI do fumo, possibilitando a identificação da existência de forte integração de capitais neste complexo em função da organização da produção/produtores nos diferentes níveis e em suas relações estreitas com o Estado. Não obstante, foi constatada a falta de um modelo de abordagem que permita evidenciar e avaliar as influências do ambiente internacional sobre as articulações de interesses, revelando uma debilidade pontual da doutrina que merece posteriores desenvolvimentos e deve ser considerada quando da avaliação da formulação de políticas públicas para o setor.-----------------------------------------------------This paper presents the contributions of Law, Political Science and Sociological Agriculture to a better compreention of the existing relations between the actors of the tobacco agribusiness and the brasilian State related to the formulation of public policies to the sector. For that, in a first moment is draw the explanatory board of the interests articulations from the perspective of these interdisciplinaries approaches. Subsequently the actors and articulations of interests of the brasilian tobacco sector are punctually studied. Such approach let verify that the existent analysis provide good elements to the comprehension of interests articulations in the tobacco agribusiness, making possible the identification of the existence of a high capital integration in this agribusiness originate from the producers/producing organization in different levels and in their closed relations with the State. In spite of this it was verified the lack of a model of approach that allows to make clear the influences of the international environment on the interests articulations, revealing a punctual debility in theory that deserves posterior studies and that must be consider for the formulation of public policies to the sector.
Geometry of Dynamical Systems
Creators: name: Kocharyan, A. A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We propose a geometrical approach to the investigation of Hamiltonian systems on (Pseudo) Riemannian manifolds. A new geometrical criterion of instability and chaos is proposed. This approach is more generic than well known reduction to the geodesic flow. It is applicable to various astrophysical and cosmological problems.
description: 14 pages
Il sistema ambientale della Santissima Annunziata. Studi e ricerche per il restauro
Creators: name: Branchi, Maddalena
Publisher: name: Restauro Archeologico
Year: 2021

description: The article describes the geophysical analyses used to deepen the knowledge of the causes and consequent degradation phenomena present on the entrance loggia and on the Oratory of San Sebastiano in the Santissima Annunziata complex in Florence. The research highlighted the importance of the relationship between architecture and the environmental system in which it is inserted, especially between the environmental characteristics and the pathologies of the structure, and confirmed the cause / effect relationship between construction and urban drainage system. The preliminary studies conducted on the monument, and in particular the diagnostic campaign of the geophysical surveys, specified the characteristics of the ground on which the Basilica of the Santissima Annunziata rests and described the specific problems of the subsoil.
description: Restauro Archeologico, Vol. 29 No. 1 (2021)
Impact of Nematicity on the Relationship between Antiferromagnetic Fluctuations and Superconductivity in FeSe0.91S0.09 Under Pressure
Creators: name: Rana, K.
name: Xiang, Li.
name: Wiecki, P.
name: Ribeiro, R. A.
name: Lesseux, G. G.
name: Böhmer, A. E.
name: Bud'ko, S. L.
name: Canfield, P. C.
name: Furukawa, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The sulfur substituted FeSe system, FeSe$_{1-x}$S$_{x}$, provides a versatile platform for studying the relationship between nematicity, antiferromagnetism, and superconductivity. Here, by nuclear magnetic resonance (NMR) and resistivity measurements up to 4.73 GPa on FeSe$_{0.91}$S$_{0.09}$, we established the pressure($p$)-temperature($T$) phase diagram in which the nematic state is suppressed with pressure showing a nematic quantum phase transition (QPT) around $p$ = 0.5 GPa, two SC regions, separated by the QPT, appear and antiferromagnetic (AFM) phase emerges above $\sim$3.3 GPa. From the NMR results up to 2.1 GPa, AFM fluctuations are revealed to be characterized by the stripe-type wavevector which remains the same for the two SC regions. Furthermore, the electronic state is found to change in character from non-Fermi liquid to Fermi liquid around the nematic QPT and persists up to $\sim$ 2.1 GPa. In addition, although the AFM fluctuations correlate with $T_{\rm c}$ in both SC states, demonstrating the importance of the AFM fluctuations for the appearance of SC in the system, we found that, when nematic order is absent, $T_{\rm c}$ is strongly correlated with the AFM fluctuations, whereas $T_{\rm c}$ weakly depends on the AFM fluctuations when nematic order is present. Our findings on FeSe$_{0.91}$S$_{0.09}$ were shown to be applied to the whole FeSe$_{1-x}$S$_{x}$ system and also provide a new insight into the relationship between AFM fluctuations and SC in Fe-based superconductors.
description: 10 pages, 10 figures including 4 pages and 6 figures of Supplementary Material, accepted for publication in Phys. Rev. B rapid communication
PRODUÇÃO DE CASTANHA-DO-BRASIL CERTIFICADA NA RESEX CHICO MENDES: IMPACTOS E AVALIAÇÕES
Creators: name: Maciel, Raimundo Claudio Gomes
name: Reydon, Bastiaan Philip
name: Maciel, Raimundo Claudio Gomes
name: Reydon, Bastiaan Philip
Publisher: name: Unknown
Year: 2008
Subjects: subject: Resource /Energy Economics and Policy
subject: Certificação Ambiental
subject: Reserva Extrativista
subject: Amazônia
subject: Avaliação Econômica
subject: Environmental Certification
subject: Extractive Reserve (RESEX)
subject: Amazon region
subject: Economic Assessment

description: O processo de ocupação econômica da Amazônia tem produzido sérios problemas sociais, econômicos e ambientais. As comunidades florestais estão cada vez mais marginalizadas, mesmo aquelas que moram em áreas de conservação, notadamente nas Reservas Extrativistas (RESEX). O ponto nevrálgico para o desenvolvimento sustentável está no nível de desempenho econômico da produção de origem florestal sustentável, face aos sistemas convencionais de exploração, visto que os atributos intangíveis das explorações sustentáveis, tais como a manutenção do equilíbrio ecológico, não são capturados pelo mercado. A certificação ambiental florestal surge como um mecanismo que pode capturar, em termos monetários, os fluxos econômicos das funções ambientais da floresta, auxiliando no sustento das famílias e da conservação do meio ambiente florestal. Busca-se, no presente trabalho, avaliar os impactos da certificação ambiental da castanha-do-Brasil, produzida na RESEX Chico Mendes. De acordo com os resultados encontrados, por intermédio da utilização de medidas de resultado econômico e de eficiência econômica, constata-se que a certificação ambiental em comunidades florestais gera preços justos apropriados pelos produtores florestais, auxiliando na manutenção das famílias no interior da floresta.----------------------------------------------The process of economic occupation of the Amazon has produced serious social problems, economic and environmental. The forest communities are increasingly marginalized, even those who live in areas of conservation, especially in the Extractive Reserves (RESEX). The core point for sustainable development is at the level of economic performance of the production of sustainable forest origin, compared with the conventional systems of exploitation, since the intangible attributes of sustainable exploration, such as the maintenance of ecological balance, are not captured by the market. The environmental certification forest emerges as a mechanism that can capture, in monetary terms, the flow of economic environmental functions of forests, helping in the sustenance of families and the conservation of the environment forest. Search is, in this work, assess the impacts of environmental certification of Brazil-Nut, produced in RESEX Chico Mendes. According to the results found, through the use of economic measures to result in economic efficiency, it is clear that the environmental certification on forest communities generates fair prices for producers appropriate forest, assisting in the maintenance of families inside the forest.
Interpretazione degli effetti sismici e analisi dinamica dei collassi in Ostia Antica
Creators: name: Pecchioli, Laura
name: Cangi, Giovanni
Publisher: name: Restauro Archeologico
Year: 2021

description: The working methods of Roman builders confirm the advanced knowledge of consolida- tion and repair techniques, so much so that quite a few of their buildings are still con- sidered stable without undergoing further interventions. For those ancient structures that have collapsed, signs of destructive events remain, allowing a chronology of events to be reconstructed, as in the ancient Roman port of Ostia. The impression given by the excava- tions in Ostia regarding the causes and dynamics of collapse, which affected both ordinary and monumental buildings, is that of a center which, in addition to natural degradation due to progressive abandonment and the ravages of man, suffered the concomitant dis- astrous effects of several natural disasters. Therefore, the contribution focuses on some structural analysis results and two seismic measurement campaigns carried out in the archaeoseismological field to understand the causes and modes of collapse that affected several building structures.
description: Restauro Archeologico, Vol. 29 No. 1 (2021)