cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Detecting continuous variable entanglement in phase space with the $Q$-distribution
Creators: name: Gärttner, Martin
name: Haas, Tobias
name: Noll, Johannes
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We prove a general class of continuous variable entanglement criteria based on the Husimi $Q$-distribution, which represents a quantum state in canonical phase space, by employing a theorem by Lieb and Solovej. We discuss their generality, which roots in the possibility to optimize over the set of concave functions, from the perspective of continuous majorization theory and show that with this approach families of entropic as well as second moment criteria follow as special cases. All derived criteria are compared to corresponding marginal based criteria and the strength of the phase space approach is demonstrated for a family of prototypical example states where only our criteria flag entanglement. Further, we explore their optimization prospects in two experimentally relevant scenarios characterized by sparse data: finite detector resolution and finite statistics. In both scenarios optimization leads to clear improvements enlarging the class of detected states and the signal-to-noise ratio of the detection, respectively.
description: 23 pages, 11 figures, published version
title: Erdõ medical center Tatabánya
Creators: name: Jenei, Livia
Publisher: name: TU Wien
Year: 2017
Subjects: subject: Architekturentwurf
subject: architectural design

description: Diese Diplomarbeit beschäftigt sich mit dem Entwurf eines Medical Center in Tatabánya, Ungarn. Die Problematik und die Förderung des Gesundheitswesen spielt heutzutage in Ungarn sehr wichtige Rolle. Die Entwicklung und die Errichtung neuer Zentren ist erwünscht. Die Arbeit beginnt mit einer Situationsanalyse. Es folgt das Ziel, das die Grundlagen des Projektes darstellt. Das Konzept gibt einen Überblick über die Komplexität einer Klinik. Im Entwurf entfaltet sich das Projekt, wie die Healing Architecture Prinzipien angewandt wurden. Dementsprechend der präzisen Grundrisse weist das Gebäude eine klare, schnörkellose Struktur auf. Zuletzt werden Schaubilder veranschaulicht, die das Endstadium der Arbeit bekannt machen.
description: This work is talking about a designing of a medical center, located in Tatabanya, Hungary. Nowadays the problematic and development of the health in Hungary is taking an important role. To build and develop new centres are imortant thing. This work starts with an analisys of the location. Then appears the target, which shows the base of the project. The concept gives a total picture about the operation of the hospital. In the project are used the healing architecture elements. Refer to the precise and exact plans is seeable the clear structure of the building. Finally there are graphs which presented the final phase of the work.
title: Random forest for unbalanced multiple-class classification
Creators: name: Kircher, Anna Sofia
Publisher: name: TU Wien
Year: 2017
Subjects: subject: Random Forest
subject: Multiple-class classification
subject: Unbalanced data
subject: Error rates

description: Random Forest is a cutting-edge method for unbalanced multiple-class classification. The main problem with unbalanced data is that the classifier tends to focus more on the bigger classes than on the smaller classes. To overcome this skewness, three sampling methods, namely oversampling, undersampling and a combination of both are introduced and compared based on the performance of the forest on a highly unbalanced data set with eleven classes. It seems that oversampling improves the performance of the forest dramatically, while undersampling often worsens it compared to the unbalanced classification. A combination of both seems, however, more adequate for this specific analysed data set since the effect of oversampling on the accuracy is much lower regarding the test data set than the dramatic improvements for the training data set. The danger of overfitting is lower if the data set is not only oversampled but retains its original total size while the observations are oversampled or undersampled to the same amount of observations. Analysing the data has shown that there are many noisy variables which legitimated raising the value of available variables (mtry) from the default to the median value between the default for classification mtry =sqrt(p) and the default value for regression mtry = 2p/3 .
Imaging strain-localized exciton states in nanoscale bubbles in monolayer WSe2 at room temperature
Creators: name: Darlington, Thomas P.
name: Carmesin, Christian
name: Florian, Matthias
name: Yanev, Emanuil
name: Ajayi, Obafunso
name: Ardelean, Jenny
name: Rhodes, Daniel A.
name: Ghiotto, Augusto
name: Krayev, Andrey
name: Watanabe, K.
name: Taniguchi, T.
name: Kysar, Jeffrey W.
name: Pasupathy, Abhay N.
name: Hone, James C.
name: Jahnke, Frank
name: Borys, Nicholas J.
name: Schuck, P. James
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In monolayer transition metal dichalcogenides, quantum emitters are associated with localized strain that can be deterministically applied to create designer nano-arrays of single photon sources. Despite an overwhelming empirical correlation with local strain, the nanoscale interplay between strain, excitons, defects and local crystalline structure that gives rise to these quantum emitters is poorly understood. Here, we combine room-temperature nano-optical imaging and spectroscopy of excitons in nanobubbles of localized strain in monolayer WSe2 with atomistic structural models to elucidate how strain induces nanoscale confinement potentials that give rise to highly localized exciton states in 2D semiconductors. Nano-optical imaging of nanobubbles in low-defect monolayers reveal localized excitons on length scales of approximately 10 nm at multiple sites along the periphery of individual nanobubbles, which is in stark contrast to predictions of continuum models of strain. These results agree with theoretical confinement potentials that are atomistically derived from measured topographies of existing nanobubbles. Our results provide one-of-a-kind experimental and theoretical insight of how strain-induced confinement - without crystalline defects - can efficiently localize excitons on length scales commensurate with exciton size, providing key nanoscale structure-property information for quantum emitter phenomena in monolayer WSe2.
description: 18 pages, 4 figures
Additional file 4 of COVID-19 - ESSKA guidelines and recommendations for resuming elective surgery
Creators: name: Mouton, Caroline
name: Hirschmann, Michael T.
name: Ollivier, Matthieu
name: Seil, Romain
name: Menetrey, Jacques
Publisher: name: figshare
Year: 2020
Subjects: Medicine
Biotechnology
Cancer
Science Policy

description: Additional file 4. Which patients should you begin with for elective orthopaedic surgery?
Coexisting Hidden and self-excited attractors in an economic system of integer or fractional order
Creators: name: Danca, Marius-F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Finance (q-fin.GN)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: In this paper the dynamics of an economic system with foreign financing, of integer or fractional order, are analyzed. The symmetry of the system determines the existence of two pairs of coexisting attractors. The integer-order version of the system proves to have several combinations of coexisting hidden attractors with self-excited attractors. Because one of the system variables represents the foreign capital in ow, the presence of hidden attractors could be of a real interest in economic models. The fractional-order variant presents another interesting coexistence of attractors in the fractional order space.
description: Accepted at IJBC (revised)
Promoting social presence : building connectedness in educational cyberspace
Creators: name: Liang, Kristy Yan
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of this study was an attempt to increase our understanding of how using language/culture/identity narratives online affects both native and nonnative English-speaking students’ development of social presence. I used Garrison and Anderson’s (2003) definition of social presence as participants’ ability in a community of inquiry to project themselves socially and emotionally, as a ’real’ person (i.e., their full personality), through the medium of communication being used. This study examines an intensive graduate course offered in mixed-mode (face-to-face and online) at a Canadian university in the summer of 2004 with 12 graduate students and their instructor. This study analyzed the online collaborative activity in the course that involved sharing and discussing group members’ autobiographies about learning a second language (L2) and focusing on their language/culture/identity development experiences. From the beginning of the course, each student wrote and shared their autobiography on the WebCT Bulletin Board (BB). This study mainly employed grounded theory and applied quantitative content analysis (QCA) as a supplementary method. Multiple sources of data consisted of online BB transcripts, interviews, participants’ assignments and field notes. And which were used to examine students’ engagement in online learning community. In this study, a theoretical model called Cyber-Narrative Mediated Connecting involving the use of mixed-mode and language/culture/identity narrative was constructed. The theoretical model consisted of four major core categories: Valuable Connecting, Constructed Connecting, Experiential Connecting and Medium Connecting. This study showed that sharing language/culture/identity narrative was not only an icebreaker, but also facilitated student interaction, promoted their social presence and participation, particularly for L2 students. This research also showed that social presence is substantial in facilitating the creation of an online learning community. The student participants used various strategies to develop connectedness with other community members, especially the participants who preferred a high level of connectedness, consistent with the view that social presence is one of the important antecedent conditions for constructive learning. The theoretical model adds to existing social presence theory. Moreover, the use of multiple research procedures helps shed light upon the benefits of the online discussions.
Synergy between CSST galaxy survey and gravitational-wave observation: Inferring the Hubble constant from dark standard sirens
Creators: name: Song, Ji-Yu
name: Wang, Ling-Feng
name: Li, Yichao
name: Zhao, Ze-Wei
name: Zhang, Jing-Fei
name: Zhao, Wen
name: Zhang, Xin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Gravitational waves (GWs) from compact binary coalescences encode the absolute luminosity distances of GW sources. Once the redshifts of GW sources are known, one can use the distance-redshift relation to constrain cosmological parameters. One way to obtain the redshifts is to localize GW sources by GW observations and then use galaxy catalogs to determine redshifts from a statistical analysis of redshift information of the potential host galaxies, commonly referred to as the dark siren method. The third-generation (3G) GW detectors are planned to work in the 2030s and will observe numerous compact binary coalescences. Using these GW events as dark sirens requires high-quality galaxy catalogs from future sky survey projects. The China Space Station Telescope (CSST) will be launched in 2024 and will observe billions of galaxies within a 17500 deg$^2$ survey area with redshift up to $z\sim 4$, providing photometric and spectroscopic galaxy catalogs. In this work, we simulate the CSST galaxy catalogs and the 5-year GW data from the 3G GW detectors and combine them to infer the Hubble constant ($H_0$). Our results show that the measurement precision of $H_0$ could reach the sub-percent level, meeting the standard of precision cosmology. We conclude that the synergy between CSST and the 3G GW detectors is of great significance in measuring the Hubble constant.
description: 13 pages, 5 figures; accepted for publication in Science China Physics, Mechanics & Astronomy
The cyclic graph (deleted enhanced power graph) of a direct product
Creators: name: Costanzo, David G.
name: Lewis, Mark L.
name: Schmidt, Stefano
name: Tsegaye, Eyob
name: Udell, Gabe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: Primary 20D40, Secondary: 05C25

description: Let $G$ be a finite group. Define a graph on the set $G^{\#} = G \setminus \{ 1 \}$ by declaring distinct elements $x,y\in G^{\#}$ to be adjacent if and only if $\langle x,y\rangle$ is cyclic. Denote this graph by $Δ(G)$. The graph $Δ(G)$ has appeared in the literature under the names cyclic graph and deleted enhanced power graph. If $G$ and $H$ are nontrivial groups, then $Δ(G\times H)$ is completely characterized. In particular, if $Δ(G\times H)$ is connected, then a diameter bound is obtained, along with an example meeting this bound. Also, necessary and sufficient conditions for the disconnectedness of $Δ(G\times H)$ are established.
description: Fixing typo in title
The peculiar galaxy Mkn 298 revisited through integral field spectroscopy
Creators: name: Radovich, M.
name: Ciroi, S.
name: Contini, M.
name: Rafanelli, P.
name: Afanasiev, V. L.
name: Dodonov, S. N.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Spectroscopic and imaging data of the peculiar galaxy Mkn 298 are presented in this paper. Narrow-band Halpha and broad-band R images are used to study the star formation rate in the galaxy and its morphology, which is typical of a merging system. Long-slit and integral field spectra are used to assess the kinematics of gas and stars, and the nature of the ionizing source at different distances from the nucleus. In particular, the nucleus of Mkn 298 is characterized by peculiar line ratios: [NII] 6583/Halpha is typical of HII-like regions, while [OI] 6300/Halpha could indicate the presence of an active galactic nucleus. We show that models where a shock component is added to photoionization from a starburst allow to reproduce the observed line ratios. Mkn 298 is thus most likely a star forming galaxy, rather than a galaxy hosting an active nucleus.
description: 9 figures, 12 pages, accepted for publication on Astronomy & Astrophysics
Supernova explosions interacting with aspherical circumstellar material: implications for light curves, spectral line profiles, and polarization
Creators: name: Kurfürst, P.
name: Pejcha, O.
name: Krtička, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Some supernova (SN) explosions show evidence for interaction with pre-existing non-spherically symmetric circumstellar medium (CSM) in their light curves, spectral line profiles, and polarization signatures. To better understand the connection with binary stars and to aid in the interpretation of observations, we perform two-dimensional axisymmetric hydrodynamic simulations where an expanding spherical SN ejecta initialized with realistic density and velocity profiles collide with various aspherical CSM distributions. We consider CSM in the form of a circumstellar disk, colliding wind shells in binary stars with different orientations and distances from the SN progenitor, and bipolar lobes representing a scaled down version of the Homunculus nebula of $η$~Car. We study how our simulations map onto observables, including approximate light curves, indicative spectral line profiles at late times, and estimates of polarization signature. We find that the SN--CSM collision layer is composed of normal and oblique shocks, reflected waves, and other hydrodynamical phenomena that lead to acceleration and shear instabilities. As a result, the total shock heating power fluctuates in time, although the emerging light curve might be smooth if the shock interaction region is deeply embedded in the SN envelope. SNe with circumstellar disks or bipolar lobes exhibit late-time spectral line profiles symmetric with respect to the rest velocity and relatively high polarization. In contrast, SNe with colliding wind shells naturally lead to line profiles with asymmetric and time-evolving blue and red wings and low polarization. Given the high frequency of binaries among massive stars, interaction of SN ejecta with a pre-existing colliding wind shell must occur and the observed signatures could be used to characterize the binary companion.
CP violating effects in the decay Z -> mu^+mu^-gamma induced by ZZgamma and Zgammagamma couplings
Creators: name: Perez, M. A.
name: Ramirez-Zavaleta, F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze possible CP-violating effects induced in the $Z$ decay with hard photon radiation by $γZZ$ and $γγZ$ anomalous vertices. We estimate the sensibility of future linear collider experiments on these couplings coming from CP-odd asymmetries associated to angular correlations of the three particle final state in $e^+e^- \to Z \to μ^+μ^-γ$. We find that a linear collider with an integrated luminosity of 500 $fb^{-1}$ and $\sqrt{s} = 0.05$ TeV can place the bound $|h_1^{γ,Z}| < 0.92$ at the 90% confidence level for these couplings.
description: Added references, 2 graphics 5 pages, LaTeX; typos added, 4 graphics removed
Higher connectivity of graph coloring complexes
Creators: name: Cukic, Sonja Lj.
name: Kozlov, Dmitry N.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Combinatorics (math.CO)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 05C15; 57M15

description: The main result of this paper is a proof of the following conjecture of Babson & Kozlov: Theorem. Let G be a graph of maximal valency d, then the complex Hom(G,K_n) is at least (n-d-2)-connected. Here Hom(-,-) denotes the polyhedral complex introduced by Lovász to study the topological lower bounds for chromatic numbers of graphs. We will also prove, as a corollary to the main theorem, that the complex Hom(C_{2r+1},K_n) is (n-4)-connected, for $n\geq 3$.
description: 16 pages, 6 figures
Fine-Grained Complexity of Regular Expression Pattern Matching and Membership
Creators: name: Schepper, Philipp
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Complexity (cs.CC)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: The currently fastest algorithm for regular expression pattern matching and membership improves the classical O(nm) time algorithm by a factor of about log^{3/2}n. Instead of focussing on general patterns we analyse homogeneous patterns of bounded depth in this work. For them a classification splitting the types in easy (strongly sub-quadratic) and hard (essentially quadratic time under SETH) is known. We take a very fine-grained look at the hard pattern types from this classification and show a dichotomy: few types allow super-poly-logarithmic improvements while the algorithms for the other pattern types can only be improved by a constant number of log-factors, assuming the Formula-SAT Hypothesis.
description: Full version of the paper accepted at ESA 2020; v2: typos and reference to conference version corrected
Mechanism Design Theory in Control Engineering: A Tutorial and Overview of Applications in Communication, Power Grid, Transportation, and Security Systems
Creators: name: Chremos, Ioannis Vasileios
name: Malikopoulos, Andreas A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This article provides an introduction to the theory of mechanism design and its application to engineering problems. Our aim is to provide the fundamental principles of the theory of mechanism design for control engineers and theorists along with the state-of-the-art methods in engineering applications. We start our exposition with a brief overview of game theory highlighting the key notions that are necessary to introduce mechanism design, and then we offer a comprehensive discussion of the principles in mechanism design. Finally, we explore four key applications of mechanism design in engineering, i.e., communication networks, power grids, transportation, and security systems.
Coexistence of antiferrodistortive and ferroelectric distortions at the PbTiO$_3$ (001) surface
Creators: name: Bungaro, Claudia
name: Rabe, K. M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The c(2$\times$2) reconstruction of (001) PbTiO$_3$ surfaces is studied by means of first principles calculations for paraelectric (non-polar) and ferroelectric ([001] polarized) films. Analysis of the atomic displacements in the near-surface region shows how the surface modifies the antiferrodistortive (AFD) instability and its interaction with ferroelectric (FE) distortions. The effect of the surface is found to be termination dependent. The AFD instability is suppressed at the TiO$_2$ termination while it is strongly enhanced, relative to the bulk, at the PbO termination resulting in a c(2x2) surface reconstruction which is in excellent agreement with experiments. We find that, in contrast to bulk PbTiO$_3$, in-plane ferroelectricity at the PbO termination does not suppress the AFD instability. The AFD and the in-plane FE distortions are instead concurrently enhanced at the PbO termination. This leads to a novel surface phase with coexisting FE and AFD distortions which is not found in PbTiO$_3$ bulk.
SISTEMAS DE PRODUÇÃO FAMILIAR NO MUNICÍPIO DE LAPÃO, BAHIA
Creators: name: Couto, Vitor De Athayde
name: Garrido, Cristiane Santos
name: Silva, Edna Maria Da
name: Teixeira, Fernanda Benicio
name: Couto, Vitor De Athayde
name: Garrido, Cristiane Santos
name: Silva, Edna Maria Da
name: Teixeira, Fernanda Benicio
Publisher: name: Unknown
Year: 2006
Subjects: subject: Farm Management
subject: Production Economics
subject: Agricultura familiar
subject: sistemas de produção
subject: renda familiar
subject: Lapão
subject: Bahia

description: Este artigo é um sub-produto do relatório da pesquisa Análise-Diagnóstico de Sistemas Agrários, realizada em quatro comunidades rurais, do município de Lapão, microrregião de Irecê, Bahia. O texto contém 5 itens além da introdução e referências. No item 1 descrevemse o ecossistema e o sistema agrário em que estão inseridas as comunidades rurais. No item 2 encontram-se os resultados da análise da comunidade Corta Facão. O item 3 refere-se à comunidade Lagoa dos Patos; o item 4, à comunidade Mosquito/ Provisório; e o item 5, à comunidade Volta Grande. Como conteúdo de cada um desses itens, detalham-se os aspectos históricos, a tipologia dos Produtores (Pi) segundo técnicas de leituras de paisagem, entrevistas com informantes-chave, tipologia dos Sistemas de Produção (Spi), onde se identificam as diferentes combinações de cultivos, criatórios e sistemas de processamento. Na análise detalhada do principal tipo de Pi e SPi, encontram-se os fluxogramas representando diferentes níveis de integração interna de cada SP, e gráficos representativos dos diferentes níveis de eficiência dos SP. Como resultado, tem-se o valor da renda agrícola que, somada à renda não-agrícola (RNA) totaliza a renda familiar (RF).
Additional file 2 of COVID-19 - ESSKA guidelines and recommendations for resuming elective surgery
Creators: name: Mouton, Caroline
name: Hirschmann, Michael T.
name: Ollivier, Matthieu
name: Seil, Romain
name: Menetrey, Jacques
Publisher: name: figshare
Year: 2020
Subjects: Medicine
Biotechnology
Cancer
Science Policy

description: Additional file 2. What should I inform my patient about before undergoing surgery?
The critical probability for random Voronoi percolation in the plane is 1/2
Creators: name: Bollobas, Bela
name: Riordan, Oliver
Publisher: name: arXiv
Year: 2004
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K35; 82B43

description: We study percolation in the following random environment: let $Z$ be a Poisson process of constant intensity in the plane, and form the Voronoi tessellation of the plane with respect to $Z$. Colour each Voronoi cell black with probability $p$, independently of the other cells. We show that the critical probability is 1/2. More precisely, if $p>1/2$ then the union of the black cells contains an infinite component with probability 1, while if $p<1/2$ then the distribution of the size of the component of black cells containing a given point decays exponentially. These results are analogous to Kesten's results for bond percolation in the square lattice. The result corresponding to Harris' Theorem for bond percolation in the square lattice is known: Zvavitch noted that one of the many proofs of this result can easily be adapted to the random Voronoi setting. For Kesten's results, none of the existing proofs seems to adapt. The methods used here also give a new and very simple proof of Kesten's Theorem for the square lattice; we hope they will be applicable in other contexts as well.
description: 55 pages, 20 figures; minor changes; to appear in Probability Theory and Related Fields
The supercurrent diode effect and nonreciprocal paraconductivity due to the chiral structure of nanotubes
Creators: name: He, James Jun
name: Tanaka, Yukio
name: Nagaosa, Naoto
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The research interest in the supercurrent diode effect (SDE) has been growing. It has been found in various kinds of systems, in a large part of which it may be understood by combining spin-orbit coupling and Zeeman field. Here, we show that there exists another mechanism of generating SDE in chiral nanotubes that trap magnetic fluxes, without spin-orbit coupling or Zeeman field. We further show that the same generalized Ginzburg-Landau theory leads to nonreciprocal paraconductivity (NPC) near the transition temperature. The main features of both the SDE and the NPC are revealed by their parameter dependence. Our study suggests a new kind of platforms to explore nonreciprocal properties of superconducting materials. It also provides a theoretical link between the SDE and the NPC, which were often studied separately.
description: 5 pages + references, 3 figures. Comments are welcome
CULTIVOS PROMISSORES PARA A DIVERSIFICAÇÃO DA AGRICULTURA FAMILIAR NO BAIXO SUL DA BAHIA
Creators: name: Santos, Alexandra Pereira Dos
name: Matos, Eloina Neri De
name: Olalde, Alicia Ruiz
name: Oliveira, Gilca Garcia De
name: Santos, Alexandra Pereira Dos
name: Matos, Eloina Neri De
name: Olalde, Alicia Ruiz
name: Oliveira, Gilca Garcia De
Publisher: name: Unknown
Year: 2006
Subjects: subject: Community/Rural/Urban Development
subject: Crop Production/Industries
subject: diversificação
subject: agricultura familiar
subject: viabilidade econômica.

description: O presente trabalho visa avaliar a viabilidade técnica e econômica de cultivos potenciais de alto valor comercial para a diversificação agrícola dos sistemas de produção dos agricultores familiares do Baixo Sul da Bahia. Foram analisados, através de estudos de caso, os cultivos de baunilha, canela, rambutão e mangostão que já estão sendo produzidos na região por agricultores de origem japonesa. Em ordem decrescente, os melhores indicadores financeiros foram para mangostão, rambutão e baunilha. A canela mostrou-se inviável devido aos baixos preços do mercado. Avaliaram-se outros fatores que devem ser considerados para a análise da adequação destes novos para a agricultura familiar: a compatibilidade com o sistema de produção em Sistemas Agroflorestais (SAFs), o investimento necessário, o tempo necessário para o início da produção comercial, a complexidade das práticas culturais e de beneficiamento, o acesso aos canais de comercialização, as exigências e o risco de mercado e a possibilidade armazenamento e de agregação de valor. Ressalta-se ainda a ausência e a necessidade de políticas públicas para o incentivo destes e de outros cultivos de alto comercial para a agricultura familiar.
Representation of contractively complemented Hilbertian operator spaces and the Fock space
Creators: name: Neal, Matthew
name: Russo, Bernard
Publisher: name: arXiv
Year: 2004
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46L07

description: The operator spaces $H_n^k$ $1\le k\le n$, generalizing the row and column Hilbert spaces, and arising in the authors' previous study of contractively complemented subspaces of $C^*$-algebras, are shown to be homogeneous and completely isometric to a space of creation operators on a subspace of the anti-symmetric Fock space. The completely bounded Banach-Mazur distance from $H_n^k$ to row or column space is explicitly calculated.
description: 11 pages
QH-POCC: taming tiling entropy in thermal expansion calculations of disordered materials
Creators: name: Esters, Marco
name: Smolyanyuk, Andriy
name: Oses, Corey
name: Hicks, David
name: Divilov, Simon
name: Eckert, Hagen
name: Campilongo, Xiomara
name: Toher, Cormac
name: Curtarolo, Stefano
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Disordered materials are attracting considerable attention because of their enhanced properties compared to their ordered analogs, making them particularly suitable for high-temperature applications. The feasibility of incorporating these materials into new devices depends on a variety of thermophysical properties. Among them, thermal expansion is critical to device stability, especially in multi-component systems. Its calculation, however, is quite challenging for materials with substitutional disorder, hindering computational screenings. In this work, we introduce QH-POCC to leverage the local tile-expansion of disorder. This method provides an effective partial partition function to calculate thermomechanical properties of substitutionally disordered compounds in the quasi-harmonic approximation. Two systems, AuCu3 and CdMg3, the latter a candidate for long-period superstructures at low temperature, are used to validate the methodology by comparing the calculated values of the coefficient of thermal expansion and isobaric heat capacity with experiment, demonstrating that QH-POCC is a promising approach to study thermomechanical properties of disordered systems.
description: 9 pages, 3 figures
UM ESTUDO DOS FATORES QUE AFETAM A FREQÜÊNCIA E O ATRASO ESCOLAR, NOS MEIOS URBANO E RURAL, DE SÃO PAULO E PERNAMBUCO
Creators: name: PONTILI, ROSANGELA MARIA
name: Kassouf, Ana Lucia
name: PONTILI, ROSANGELA MARIA
name: Kassouf, Ana Lucia
Publisher: name: Unknown
Year: 2006
Subjects: subject: Community/Rural/Urban Development
subject: educação
subject: meios urbano e rural
subject: políticas públicas

description: Diversos trabalhos, da literatura econômica, têm mostrado a influência da educação na melhoria de renda das pessoas e no desenvolvimento econômico de um país. Entretanto, para melhorar o nível médio de escolaridade de um país é importante elevar a freqüência escolar e garantir à criança o avanço nos estudos. Preocupado com essa questão o Governo Federal brasileiro realizou diversas reformas no sistema educacional, especialmente a partir da década de 1990. Em vista disso, o presente trabalho fez uma análise da influência que variáveis associadas a características pessoais e familiares de uma criança, bem como variáveis de infra-estrutura escolar exercem sobre a freqüência e o atraso escolar no ensino fundamental, comparando-se as áreas urbana e rural, de Pernambuco e São Paulo. Os resultados mostraram que políticas voltadas para melhorar a escolaridade do chefe de família e/ou a renda familiar per capita podem aumentar a freqüência e reduzir o atraso escolar. Entretanto, iniciativas voltadas para melhorar a infra-estrutura escolar deverão levar em conta a realidade econômica do estado ou região e o objetivo final a ser alcançado. Além disso, os indicadores educacionais estudados são mais precários na área rural e merecem a elaboração de políticas públicas especialmente voltadas para essa realidade.
Valor de mercado y disposicion a pagar por la marca "Ternasco de Aragon"
Creators: name: Ulloa, Ricardo
name: Gil, Jose
name: Ulloa, Ricardo
name: Gil, Jose
Publisher: name: Unknown
Year: 2008
Subjects: subject: Financial Economics
subject: Marketing
subject: FOS: Economics and business
subject: Production Economics
subject: precios de mercado
subject: valor percibido
subject: Ternasco de Aragon
subject: disposicion a pagar
subject: perceived value
subject: market price
subject: willingness-to-pay.

description: El objetivo de este trabajo se centra en comparar el valor de mercado de una marca generica de calidad ligada a un territorio, como es el Ternasco de Aragon (TA), con el valor percibido por parte del consumidor, con el fin de obtener el mercado potencial de dicho productor, Asimismo, se analizan los factores determinantes de dicho valor percibido. Para ello se comparan los precios erales de mercado con la informacion obtenida a partir de una muestra representativa de consumidores en la mencionada region, que se ha segmentado teniendo en cuenta el nivel o experiencia de consumo en relaion con la carne de cordero. Para los dos segmentos se calcula su maxima disposicion a pagar por la marca TA y se estima un modelo capaz de explicar los factores determinantes de dicha decision. En terminos generales, los resultados obtenidos en este trabajo confirman una imagen de calidad de la marca Ternasco de Aragon tanto en el mercado como en la mente de los propios consumidores. Mienras que la experiencia previa y los atributos intrinsecos del productos son los principales determinantes de la decision de pagar un sobreprecio, las caracteristicas sociodemograficas y psicograficas son las que juegan un papel mas relevante cuando lo que se mide es la cuantia que se esta dispuesto a pagar. En cualquier caso, el potencial de crecimiento de este producto en la region es moderado, ya que el valor percibido, en terminos medios, se situa por debajo del precio real de mercado... The objective of this paper is to compare the market value of a quality label linked to a specific region, Ternasco de Aragon(TA), with the consumer's perceived value, in order to estimate the market potential. Moreover, main factors affecting the perceived value are analyzed. To achieve this objective, market prices are collected as well as information from a representative sample from this region. Consumers segments are defined taking into account their experience in lamb meat consumption. For each segment, we analyze the consumer;s knowledge, attitudes and willingness-to-pay (WTP) a premium for the quality label TA. We also estimate a model to analyze main factors affecting the WTP, Results indicate that both the market and teh consumers associate the TA label to a higher quality and more expensive product. While previous experience and intrinsic attributes are main determinants to pay a premium, consumer's socio-economic characteristics and lifestyles play a more important role in determining the premium amount. In any case, the market potential of the TA label is moderate as, in average, market prices are higher than the premium consumers are willing to pay.
Additional file 1 of Association of human XPA rs1800975 polymorphism and cancer susceptibility: an integrative analysis of 71 case–control studies
Creators: name: Maoxi Yuan
name: Chunmei Yu
name: Kuiying Yu
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer

description: Additional file 1: Table S1. Search terms of six online databases. Table S2. The association between XPA rs1800975 and the risk of lung cancers in the Caucasian population. Table S3. The association between XPA rs1800975 and the risk of lung and colorectal cancers in the Caucasian population (only PB-based controls).
YAG:Nd crystals as possible detector to search for double beta and alpha decay of neodymium
Creators: name: Danevich, F. A.
name: Kobychev, V. V.
name: Nagorny, S. S.
name: Tretyak, V. I.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Energy resolution, alpha/beta ratio, pulse-shape discrimination for gamma rays and alpha particles, radioactive contamination were studied with neodymium doped yttrium-aluminum garnet (YAG:Nd). Applicability of YAG:Nd scintillators to search for double beta decay and alpha activity of natural neodymium isotopes are discussed.
description: 10 pages, 4 figs
Los retos de la investigacion agroalimentaria en America Latina
Creators: name: Echeverria, Ruben
name: Trigo, Eduardo
name: Echeverria, Ruben
name: Trigo, Eduardo
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agribusiness
subject: Research and Development/Tech Change/Emerging Technologies
subject: investigacion agrolimentaria para el desarrollo
subject: desafios para la investigacion agraria regional en America Latina
subject: agriculutral research for development
subject: regional agricultural research
subject: challenges for regional agricultural research in Latin America

description: Los sistemas nacionales de investigacion en America Latina han realizado importantes contribuciones al desarrollo de la region, a reducir la pobreza, a mejorar la seguridad alimemtaria y al manejo de los recursos naturales en America Latina. Pese a ello, en las ultimas dos decadas ha existido, en general para toda la region, el financiamiento a la investigacion no se ha incrementado y existe en general la opinion de que los sistemas nacionales no generan el tipo de conocimientos que demanda la sociedad. En transicion y enfrentan a veces tendencias contradictorias, como por ejemplo la ampliacion de las demandas de investigacion junto a una marcada subinversion. Existe mucha heterogeneidad en cuanto a la inversion y a las capacidades de investigacion a nivel nacional; Brasil ha logrado invertir en investigacion mas del 1,5 por ciento del producto bruto agricola, mientras que el promedio en America Central es de 0,25 por ciento. Mejorar la eficiencia y la eficacia del financiamiento, ajustar los marcos institucionales, identificar agendas de investigacion que reflejen mejor las demandas de la sociedad son algunas de las orientaciones hacia el futuro, En esta tarea los mecanismos subregionales y regionales de investigacion y de financiamiento de la investigacion tienen un papel estrategico a cumplir...National agricultural research systems en Latin America have made significant contributions to the overall development of the region, to poverty reduction, to improve food security and natural resource management. However, in the past two decades the region as a whole has not increased funding for agricultural research and there exist the perception that research systems are not generating the knowledge that society demands. As a consequence, public agricultural research organizations are in transition and sometimes face contradictory demands, such as an increase in the research agenda and a decrease in research budgets. There a huge eterogeneity with respect to investments and capacities for research in Latin America; Brazil has been investing more than 12.5 percent of agricultural GDP in agricultural research while Central America on average has not invested more than .25 percent of agricultural GDP. To improve the efficiency and effectiveness of research financing, adjust the institutional framework, identify research agendas that better reflect societal demands are some of the future challenges. In addressing these issues, subregional and regional research and funding mechanism have a strategic role to play.
Bound states and controllable currents on Topological Insulator surfaces with extended magnetic defects
Creators: name: Thareja, Eklavya
name: Vekhter, Ilya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We show that a magnetic line defect on the surface of a topological insulator generically supports two distinct branches of spin-polarized and current carrying one-dimensional bound states. We identify the components of magnetic scattering that lead to the bound states. The velocity, and hence spin texture, of each of those branches can be independently tuned by a magnetic field rotated in the plane of the surface. We compute the local net and spin-resolved density of states as well as spin accumulation and charge currents. The net spin polarization and current due to both bound and scattering states vary stepwise as a function of the electrostatic and magnetic components of the scattering potential, and can be tuned by an applied field. We discuss stability of the bound states with respect to impurity scattering.
La modelizacion de las disposiciones a pagar negativas, neutras y positivas en el metodo de valoracion contingente: aplicacion a un proyecto de reforestacion en parques naturales
Creators: name: Colombo, Sergio
name: Hanley, Nick
name: Colombo, Sergio
name: Hanley, Nick
Publisher: name: Unknown
Year: 2008
Subjects: subject: Public Economics
subject: valoracion contingente
subject: respuestas negativas
subject: modelo spike
subject: contingent valuation
subject: negative answers
subject: spike model

description: En los ejercicios de valoracion de los recursos naturales a traves del metodo de valoracion contingente el investigador tipicamente pregunta a los entrevistados cual es su maxima disposicion a pagar por un cambio en la calidad o cantidad del bien en estudio. Los entrevistados pueden tener preferencias distintas, e inclusos opuestas, con respecto al cambio propuesto, de tal forma que lo que representa un beneficio por algunos puede ser un perjuicio por otros. Los disenos de las encuestas de valoracion contingente normalmente empleados no permitten caracterizar la heterogeneidad en las preferencias de los individuos. Ademas, los modelos empleados en el analisis econometrico de los datos a menudo excluyen los valores negativos o neutros de DAP, proporcionando asi estimaciones sesgades de la disposicion a pagar global. En este trabajo se describe un diseno de la encuesta que permite caracterizar la heterogeneidad de las preferencias de los entrevistados y se emplea un modelo econometrico que considera a la vez las disposiciones a pagar negativas neutras y positivas. La disposicion a pagar estimada segun el enfoque propuesto se comenta y compara con respecto a la obtenida segun dos enfoques comunmente empleados...In the economic evaluation of natural resources through contingent valuation, despite the fact that many externalities manifest themselves as costs to some and benefits to others, most studies restrict willingness to pay to being non-negative or even strictly positive. Often, this is because the survey designs normally employed do not allow detecting respondents' preference heterogeneity. In this paper, we make use of a specific design that allow characterizing respondents heterogeneity and investigate the impact of allowing for negative, zero and positive preferences in the willingness to pay for prospective changes in woodland cover. The implications of different design approaches will also be highlighted
Additional file 1 of COVID-19 - ESSKA guidelines and recommendations for resuming elective surgery
Creators: name: Mouton, Caroline
name: Hirschmann, Michael T.
name: Ollivier, Matthieu
name: Seil, Romain
name: Menetrey, Jacques
Publisher: name: figshare
Year: 2020
Subjects: Medicine
Biotechnology
Cancer
Science Policy

description: Additional file 1. Facility checklist to resume elective surgery.
Disenos alternativos para un indice de sostenibilidad agricola: el caso de la agricultura de regadio del Duero
Creators: name: Gomez-Limon, Jose
name: Gomez-Limon, Jose
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Environmental Economics and Policy
subject: sostenibilidad
subject: indicadores sinteticos
subject: agricultura de regadio
subject: escenarios
subject: politica agraria
subject: sustainability
subject: composite indicators
subject: irrigated agriculture
subject: scenarios
subject: agricultural policy

description: Este trabajo tiene como objetivo realizar un analisis comparativo de diferentes metodos alternativos para la obtencion de indicadores sinteticos que cuantifiquen la sostenibilidad global de la actividad agricola. El caso de estudio considerado para la aplicacion empirica ha sido la agricultura de regadio del Duero, utilizando para ello una base informativa de indicadores ya calculados con anterioridad para diferentes explotaciones-tipo y para diferentes escenarios politicos. Los resultados obtenidos han permitido establecer una jerarquia de los escenarios politicos en funcion de sus sostenibilidad. Asimismo, analizando la heterogeneidad de explotaciones-tipo en cade escenario, se han determinado igualmente las caracteristicas de las explotaciones mas sostenibles en cada caso. Esta informacion permite mejorar la orientacion de la politica agraria al objeto de aumentar la sostenibilidad de este sector...The aim of this paper is to carry out a comparative analysis of alternative methods for the calculation of composite indicators in order to measure global sustainability of the agricultural activity. These methods have been applied to the irrigated agriculture of the Duero basin (Spain), using a data set of indicators previously calculated for different policy scenarios at farm level. The results establish a hierarchy of the policy scenarios based on their sustainability. Analyzing farms-type heterogeneity in each scenario, it is also possible to determine the main features of the most sustainable farms in each case. This information could improve the agricultural policy implementation in order to increase the sustainability of this sector.