cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
EL PROGRAMA DE LICENCIATURA EN AGRONEGOCIOS INTERNACIONALES EN LA UNIVERSIDAD VERACRUZANA, MEXICO
Creators: name: Vazquez Selem, Enrique
name: Barradas Troncoso, Dora Silvia
name: Villagomez Cortes, Jose Alfredo
name: Mora Brito, Angel Homero
name: Vazquez Selem, Enrique
name: Barradas Troncoso, Dora Silvia
name: Villagomez Cortes, Jose Alfredo
name: Mora Brito, Angel Homero
Publisher: name: Unknown
Year: 2013
Subjects: subject: Agribusiness
subject: Higher education
subject: agribusiness
subject: innovation
subject: agriculture
subject: and agroindustry.

description: This paper reviews the origin of the International Agribusiness bachelor degree program (LAI) offered by the University of Veracruz (UV). Background information that led to the proposal is revisited; similar programs currently offered in Mexico are analyzed, and highlighted the features offered by the LAI-UV program. The goal of this program is to position the University of Veracruz as a leader in human resource training for agribusiness in southeastern Mexico. We identified 13universitiesoffering a similar agribusiness degree program, although operating under nine different names; they share several features in their curricula. All programs aim to develop common competencies such as, agricultural marketing, business administration, design and evaluation of productive projects, and organization of producer groups. It is concluded that the program of LAI-UV can fill a niche in education in a region where the primary sector activities are particularly important.
Entanglement formation in continuous-variable random quantum networks
Creators: name: Zhang, Bingzhi
name: Zhuang, Quntao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Entanglement is not only important for understanding the fundamental properties of many-body systems, but also the crucial resource enabling quantum advantages in practical information processing tasks. While previous works on entanglement formation and networking focus on discrete-variable systems, light---as the only travelling carrier of quantum information in a network---is bosonic and thus requires a continuous-variable description in general. In this work, we extend the study to continuous-variable quantum networks. By mapping the ensemble-averaged entanglement dynamics on an arbitrary network to a random-walk process on a graph, we are able to exactly solve the entanglement dynamics and reveal unique phenomena. We identify squeezing as the source of entanglement generation, which triggers a diffusive spread of entanglement with a parabolic light cone. The entanglement distribution is directly connected to the probability distribution of the random walk, while the scrambling time is determined by the mixing time of the random walk. The dynamics of bipartite entanglement is determined by the boundary of the bipartition; An operational witness of multipartite entanglement, based on advantages in sensing tasks, is introduced to characterize the multipartite entanglement growth. A surprising linear superposition law in the entanglement growth is predicted by the theory and numerically verified, when the squeezers are sparse in space-time, despite the nonlinear nature of the entanglement dynamics. We also give exact solution to the equilibrium entanglement distribution (Page curves), including its fluctuations, and found various shapes dependent on the average squeezing density and strength.
description: 15+3+2 pages, 24 figures
The band-edge behavior of the density of surfacic states
Creators: name: Kirsch, Werner
name: Klopp, Frederic
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 60H25; 47B80

description: This paper is devoted to the asymptotics of the density of surfacic states near the spectral edges for a discrete surfacic Anderson model. Two types of spectral edges have to be considered : fluctuating edges and stable edges. Each type has its own type of asymptotics. In the case of fluctuating edges, one obtains Lifshitz tails the parameters of which are given by the initial operator suitably "reduced" to the surface. For stable edges, the surface density of states behaves like the surface density of states of a constant (equal to the expectation of the random potential) surface potential. Among the tools used to establish this are the asymptotics of the surface density of states for constant surface potentials.
Solving the problem of overdetermination of quasisymmetric equilbrium solutions by near-axis expansions. II. Circular axis stellarators
Creators: name: Rodriguez, Eduardo
name: Bhattacharjee, Amitava
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We apply the near-axis expansion method for quasisymmetric magnetic fields with anisotropic pressure (developed in the companion paper, Part I [E. Rodriguez, A. Bhattacharjee, arXiv:2008.04715 (2020)]) to construct numerical solutions to circular axis stellarators. The solutions are found to second order in the distance from the axis, not possible in the standard Garren-Boozer construction [D. A. Garren and A. H. Boozer, Physics of Fluids B: Plasma Physics, 2822 (1991)], which assumes magnetostatic equilibria with isotropic pressure. In the limit of zero anisotropy, it is shown that a subset of coefficients can be chosen to avoid the overdetermination problem.
Correlation between superfluid density and Tc of underdoped YBa2Cu3O6+x near the superconductor-insulator transition
Creators: name: Zuev, Yuri
name: Kim, Mun Seog
name: Lemberger, Thomas R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report measurements of the ab-plane superfluid density Ns (magnetic penetration depth, λ) of severely underdoped films of YBa2Cu3O6+x, with Tc's from 6 to 50 K. Tc is not proportional to Ns(0); instead, we find Tc ~ Ns^{1/2.3 +/- 0.4}. At the lowest dopings, Tc is as much as 5 times larger than the upper limit set by the KTB transition temperature of individual CuO2 bilayers.
description: 4 pages, 2 figures, Submitted to Phys. Rev. Lett
PLANEACIÓN ESTRATÉGICA DE UNA EMPRESA FAMILIAR DE COMIDA RÁPIDA
Creators: name: Magana Magana, Eduardo
name: Licon Trillo, Lorena Patricia
name: Kiessling Davison, Christian Mauricio
name: Soto Zapata, Manuel
name: Villarreal Ramirez, Victor Hugo
name: Magana Magana, Eduardo
name: Licon Trillo, Lorena Patricia
name: Kiessling Davison, Christian Mauricio
name: Soto Zapata, Manuel
name: Villarreal Ramirez, Victor Hugo
Publisher: name: Unknown
Year: 2013
Subjects: subject: Agribusiness
subject: Marketing research
subject: SWOT analysis
subject: advertising campaign.

description: This study was carried out in a food company in Delicias, Chihuahua, which founded in 1975 and offers many different varieties of tortas and hamburgers accompany with carrots and tanning chili peppers prepared by them. The sales have been increasing in the last five years, therefore the owners are worried to diminish its competitiveness and they began a process to be more competitive and change its status to a formal company. The purpose of this study was to conduct a marketing research and a strategic planning to obtain information to setting objectives and competitive strategies. The market segments that attend this small business are: familiar consumers, student and workers who qualified its quality and taste as good. The strengths most important were home service, fresh materials and unique recipe. The opportunities were price of suppliers, high prices of American franchises, consumer's loyalty, increasing demand of food out of home and a strategic location. The EFI matrix was 3.51 which indicated that its strengths were highly above of the industry while the EFE matrix was 2.97 lightly above of the industry and indicated that its strategies to get the opportunities has to be improved. As a conclusion this small business has to improve its management and marketing activities to get the opportunities of its market.
Mopar : a Mobile Overlay Peer-to-Peer Architecture for Scalable Massively Multiplayer Online Games
Creators: name: Yu, Peiqun
Publisher: name: University of British Columbia
Year: 2010

description: We propose a fully distributed peer-to-peer (P2P) infrastructure supporting networked virtual environment (NVE) applications, such as massively multiplayer online games (MMOGs). While P2P computing is commonly recognized as a useful architecture for improving the scalability of MMOGs, it is still challenging to have a truly scalable system without compromising reliability, responsiveness, consistency, and low overhead. We propose a hybrid infrastructure - A Mobile Overlay Peer-to-Peer Architecture for Scalable Massively Multiplayer Online Games (MOPAR), to address this scalability issue of MMOGs. Our approach exploits the concept of interest management, taking advantage of both a structured overlay (i.e., distributed hash table (DHT)), and unstructured P2P architecture. Our infrastructure is not only more scalable and reliable than other approaches; it provides the benefits of high responsiveness, and low overhead. In this thesis, we present a novel hierarchical architecture and associated algorithms to alleviate the workload of each peer, save network bandwidth, and reduce overhead cost. We also present a novel zoning scheme that guarantees all players have a continuous view. We anticipate that our infrastructure will provide a generic, configurable, and efficient framework that can be used to facilitate user-designed P2P MMOGs or NVE applications.
Synchronization of the Frenet-Serret linear system with a chaotic nonlinear system by feedback of states
Creators: name: Solis-Perales, G.
name: Rosu, H. C.
name: Hernandez-Rosales, C.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: A synchronization procedure of the generalized type in the sense of Rulkov et al [Phys. Rev. E 51, 980 (1995)] is used to impose a nonlinear Malasoma chaotic motion on the Frenet-Serret system of vectors in the differential geometry of space curves. This could have applications to the mesoscopic motion of biological filaments
description: 12 pages, 7 figures, accepted at Int. J. Theor. Phys
The Cosmological Phonon: Symmetries and Amplitudes on Sub-Horizon Scales
Creators: name: Grall, Tanguy
name: Jazayeri, Sadra
name: Stefanyszyn, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In contrast to massless spinning particles, scalars are not heavily constrained by unitarity and locality. Off-shell, no gauge symmetries are required to write down manifestly local theories, while on-shell consistent factorisation is trivial. Instead a useful classification scheme for scalars is based on the symmetries they can non-linearly realise. Motivated by the breaking of Lorentz boosts in cosmology, in this paper we classify the possible symmetries of a shift-symmetric scalar that is assumed to non-linearly realise Lorentz boosts as, for example, in the EFT of inflation. Our classification method is algebraic; guided by the coset construction and inverse Higgs constraints. We rediscover some known phonon theories within the superfluid and galileid classes, and discover a new galileid theory which we call the $\textit{extended galileid}$. Generic galileids correspond to the broken phase of galileon scalar EFTs and our extended galileids correspond to special subsets where each galileon coupling is fixed by an additional symmetry. We discuss the broken phase of theories that also admit a perturbation theory around Poincaré invariant vacua and we show that the so-called exceptional EFTs, the DBI scalar and special galileon, do not admit such a broken phase. Concentrating on DBI we provide a detailed account of this showing that the scattering amplitudes are secretly Poincaré invariant when the theory is expanded around the superfluid background used in the EFT of inflation. We point out that DBI is an exception to the common lore that the residue of the total energy pole of cosmological correlators is proportional to the amplitude. We also discuss the inevitability of poles in $2 \rightarrow 2$ scattering amplitudes when boost are spontaneously broken meaning that such theories do not admit Adler zeros and generalisations even in the presence of a shift symmetry.
description: 45 pages, 6 Figures, 3 Tables
Gapless spin liquid and valence-bond solid in the $J_1-J_2$ Heisenberg model on the square lattice: insights from singlet and triplet excitations
Creators: name: Ferrari, Francesco
name: Becca, Federico
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The spin-$1/2$ $J_1-J_2$ Heisenberg model on the square lattice represents one of the simplest examples in which the effets of magnetic interactions may suppress magnetic order, eventually leading to a pure quantum phase with no local order parameters. This model has been extensively studied in the last three decades, with conflicting results. Here, by using Gutzwiller-projected wave functions and recently developed methods to assess the low-energy spectrum, we show the existence of a level crossing between the lowest-energy triplet and singlet excitations for $J_2/J_1 \approx 0.54$. This fact supports the existence of a phase transition between a gapless spin liquid (which is stable for $0.48 \lesssim J_2/J_1 \lesssim 0.54$) and a valence-bond solid (for $0.54 \lesssim J_2/J_1 \lesssim 0.6$), even though no clear sign of dimer order is visible in the correlations functions. These results, which confirm recent density-matrix renormalization calculations on cylindrical clusters [L. Wang and A.W. Sandvik, Phys. Rev. Lett. 121, 107202 (2018)] reconcile the contraddicting results obtained within different approaches over the years.
description: 5 pages, 6 figures
DETERMINACIÓN DE RENTABILIDAD DE TRIGO EN LA COSTA DE HERMOSILLO, SONORA
Creators: name: Retes Lopez, Rafael
name: Moreno Medina, Salomon
name: Denogean Ballesteros, Francisco G.
name: Martin Rivera, Martha H.
name: Ibarra Flores, Fernando A.
name: Retes Lopez, Rafael
name: Moreno Medina, Salomon
name: Denogean Ballesteros, Francisco G.
name: Martin Rivera, Martha H.
name: Ibarra Flores, Fernando A.
Publisher: name: Unknown
Year: 2013
Subjects: subject: Agribusiness
subject: Wheat
subject: yield
subject: capital of work
subject: balance
subject: price
subject: cost.

description: The wheat occupies an important place in the feeding of the humanity and is the third cereal demanded after the maize and the rice; Sonant occupies the first one in production of wheat at national level with approximately a 45% of the seeded surface. In order to analyze the yield of wheat seedtime the production costs were taken where it is the different consumptions that were used that they go from the terrain preparation, seed, fertilization, water, control of plagues, diseases and weeds, harvests and diverse between which the technical attendance is had, safe agriculturist, administration. The direct costs of the culture were $ 16.550 to which the financial cost of $796 for a total of $ 17.346 was added to him which compared with the obtained income taking as reference a yield average of 6 tons by hectares and to a price of $ 3.400 by ton served to carry out the yield analysis. Financial tools were used to determine their yield like the capital of work, relation benefit-cost, point of balance and sensitivity analysis; with base to this it was obtained that the capital of work necessary to develop the culture was of $ 15,350; the relation benefit-cost was of 1,18 and the sensitivity analysis showed that the producer can have optimal scenes with good prices and yields and compared with very low prices and smaller yields. With these indicators it is observed that the producer can develop the wheat with little risk when obtaining acceptable income besides being a cereal that mainly occupies the first place in the surface seeded in Sonora, in the south of the state where the irrigation system is of gravity which benefits in its smaller production cost since this consumption approximately represents 22% of the total cost.
Four-dimensional Vibrational Spectroscopy for Nanoscale Mapping of Phonon Dispersion in BN Nanotubes
Creators: name: Qi, Ruishi
name: Li, Ning
name: Du, Jinlong
name: Shi, Ruochen
name: Huang, Yang
name: Yang, Xiaoxia
name: Liu, Lei
name: Xu, Zhi
name: Dai, Qing
name: Yu, Dapeng
name: Gao, Peng
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: Direct measurement of local phonon dispersion in individual nanostructures can greatly advance our understanding of their electrical, thermal, and mechanical properties. However, such experimental measurements require extremely high detection sensitivity and combined spatial, energy and momentum resolutions, thus has been elusive. Here, we develop a four-dimensional electron energy loss spectroscopy (4D-EELS) technique based a monochromated scanning transmission electron microscope (STEM), and present the position-dependent phonon dispersion measurement in individual boron nitride nanotubes (BNNTs). Our measurement shows that the unfolded phonon dispersion of multi-walled BNNTs is close to hexagonal-boron nitride (h-BN) crystals, suggesting that interlayer coupling and curved geometry have no substantial impacts on phonon dispersion. We also find that the acoustic phonons are extremely sensitive to momentum-dependent defect scattering, while optical phonons are much less susceptible. This work not only provides useful insights into vibrational properties of BNNTs, but also demonstrates huge prospects of the developed 4D-EELS technique in nanoscale phonon dispersion measurements.
Additional file 1 of Childhood socioeconomic status, comorbidity of chronic kidney disease risk factors, and kidney function among adults in the midlife in the United States (MIDUS) study
Creators: name: Surachman, Agus
name: Daw, Jonathan
name: Bray, Bethany C.
name: Alexander, Lacy M.
name: Coe, Christopher L.
name: Almeida, David M.
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Marine Biology

description: Additional file 1: Supplemental Table. Model Fit Information for Latent Class Analysis.
Status and First Results of the MAGIC Telescope
Creators: name: Cortina, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The 17 m MAGIC Cherenkov telescope for gamma ray astronomy between 30 and 300 GeV started operations in its final configuration in October 2003 and is currently well into its calibration phase. Here I report on its present status and its first gamma ray source detections.
description: Contribution to the proceedings of the II Workshop on Unidentified Gamma-Ray Sources, Hong Kong, June 1-4, 2004
Additional file 1 of Humanization of care in pediatric wards: differences between perceptions of users and staff according to department type
Creators: name: Mandato, C.
name: M. A. Siano
name: A. G. E. De Anseris
name: M. Tripodi
name: G. Massa
name: R. De Rosa
name: M. Buffoli
name: A. Lamanna
name: P. Siani
name: P. Vajro
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Neuroscience
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: 110309 Infectious Diseases

description: Additional file 1 Figure S1 Supplementary. LpCp tool for patients/visitors/parents/companions: percentages of positive responses (dark grey columns) given for each question by parents/ companions interviewed with the LpCp tool in each of the seven pediatric wards. [Children’s Hospital (A), Pediatric Department of University Hospital (B and C) and General Hospital (D, E, F, G)].
How special is the Solar System?
Creators: name: Beer, M. E.
name: King, A. R.
name: Livio, M.
name: Pringle, J. E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Most mechanisms proposed for the formation of planets are modified versions of the mechanism proposed for the solar system. Here we argue that, in terms of those planetary systems which have been observed, the case for the solar system being a typical planetary system has yet to be established. We consider the possibility that most observed planetary systems have been formed in some quite different way. If so, it may be that none of the observed planetary systems is likely to harbour an earth-like planet.
description: 6 pages, 3 figures, MNRAS accepted
A Statistical Mechanical Load Balancer for the Web
Creators: name: Bridgewater, Jesse S. A.
name: Boykin, P. Oscar
name: Roychowdhury, Vwani P.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The maximum entropy principle from statistical mechanics states that a closed system attains an equilibrium distribution that maximizes its entropy. We first show that for graphs with fixed number of edges one can define a stochastic edge dynamic that can serve as an effective thermalization scheme, and hence, the underlying graphs are expected to attain their maximum-entropy states, which turn out to be Erdos-Renyi (ER) random graphs. We next show that (i) a rate-equation based analysis of node degree distribution does indeed confirm the maximum-entropy principle, and (ii) the edge dynamic can be effectively implemented using short random walks on the underlying graphs, leading to a local algorithm for the generation of ER random graphs. The resulting statistical mechanical system can be adapted to provide a distributed and local (i.e., without any centralized monitoring) mechanism for load balancing, which can have a significant impact in increasing the efficiency and utilization of both the Internet (e.g., efficient web mirroring), and large-scale computing infrastructure (e.g., cluster and grid computing).
description: 11 Pages, 5 Postscript figures; added references, expanded on protocol discussion
ESTRATEGIAS DE MERCADO PARA PRODUCTOS ELABORADOS A BASE DE CHILTEPÍN EN LA SIERRA DE SONORA
Creators: name: Coronado Garcia, Manuel Arturo
name: Cordova Yanez, Alejandro
name: Garcia Porchas, Mercedes
name: Santiago Hernandez, Víctor Guadalupe
name: Vasquez Navarro, Rubin Angel
name: Coronado Garcia, Manuel Arturo
name: Cordova Yanez, Alejandro
name: Garcia Porchas, Mercedes
name: Santiago Hernandez, Víctor Guadalupe
name: Vasquez Navarro, Rubin Angel
Publisher: name: Unknown
Year: 2013
Subjects: subject: Agribusiness
subject: Chiltepín
subject: market strategies
subject: sierra de Sonora
subject: sustainable development
subject: producers
subject: Universidad de la Sierra.

description: In the state of Sonora, as a result of investigation, you can identify the bush chiltepín as a crucial element of the culture of the people, giving different uses both culinary and medicinal and spiritual, is also important to mention that there been one of its main sources of income is represented by the marketing of agricultural products. Currently, the only given chiltepín wild in parts of southern, central, and eastern mountain area of ?Sonora. It grows on the banks of streams and along ravines in the desert scrub, thorn scrub, tropical deciduous forest, and oak. Because of this, there is no specific control on the production of this shrub, as collectors, just go to areas where the plant and cut by 50% or even full, and then market their fruit this can result in decreased production to disappear. At present, agricultural products represent a potential source of income for rural communities and therefore a significant sustainable development in the regions. However, this research sought to emphasize the culture of the inhabitants of a region and thus to design marketing strategies for specific products, for economic development in rural areas. It shall be general purpose, identify key issues of managing chiltepín in the mountainous region of Sonora, and design strategies that transform the meaning of this activity making it sustainable and more profitable for those developing. In the framework details the marketing strategies that are implemented for the development of products made from chiltepín, as well as a description of the 4p's of marketing. The realization of this project is a potentially successful investment, because chiltepín enter a niche market, not only launched a new product to market but also contribute to the sustainable development of the mountainous region, and also be able to maintain a control over this coveted bush and survival.
Additional file 1 of Coordination of cyclic di-GMP and 4-hydroxybenzoic acid in regulating antifungal antibiotic biosynthesis in Lysobacter enzymogenes
Creators: name: Han, Sen
name: Mingming Yang
name: Fulano, Alex M.
name: Lin, Long
name: Shan-Ho Chou
name: Qian, Guoliang
Publisher: name: figshare
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 1: Table S1. Strains and plasmids used in this study. Table S2. Primers used in this study. Figutre S1. Western blot analyses of the CdgL-Flag fusion expression in Lysobacter enzymogenes.Figure S2. MST showing no detectable GST-CdgL binding to 4-HBA.
title: Finite elemente Simulationen der Lochplatte aus Faserverbund-Laminat
Creators: name: Kóbor, Balázs
Publisher: name: TU Wien
Year: 2018
Subjects: subject: Finite-Elemente-Methode
subject: Faserverbundwerkstoffe
subject: Schädigungsmechanik
subject: Plastizität
subject: Lochplatte
subject: Finite-Element-Method
subject: Fiber-reinforced composites
subject: Damage mechanics
subject: Plasticity
subject: Open-Hole-Tension-Test

description: Die vorliegende Arbeit beschäftigt sich mit der Simulation von Laminaten aus faserverstärkten Kunststoffen. Der Entwurf von Strukturen aus faserverstärkten Kunststoffen wird heutzutage sehr stark durch die Finite Elemente Methode unterstützt. Um dieses numerische Mittel zur Vorhersage des Verhaltens der beschädigten Composite-Strukturen verwenden zu können, muss ein Konstitutivgesetz entwickelt werden, das die Behandlung des nichtlinearen Schichtverhaltens gestattet. Im Rahmen dieser Diplomarbeit werden zwei verschiedenen Materialmodelle miteinander verglichen. Eines der Modelle wurde von Thomas Flatscher am Institut für Leichtbau und Struktur-Biomechanik, Technische Universität Wien entwickelt. Das andere Materialgesetz wird vom FE-Programm Abaqus/Explicit 6.13. (Dassault Systèmes Simuia Corp., Providence, RI, USA) kommerziell angeboten. Der Vergleich der zwei Konstitutivgesetze erfolgt anhand der Finite Element Analyse einer Lochplatte aus einem faserverstärkten Kunststoff unter Zugbelastung. Zur Simulation kommt das Programmes Abaqus/Explizit zum Einsatz, in dem die beiden Materialmodelle implementiert wurden. Zur Validierung der Analysen stehen Messergebnisse zur Verfügung. Das Ziel dieser Diplomarbeit ist der Vergleich der Ergebnisse der zwei Materialmodelle und die Bestimmung der Quelle der Abweichungen zwischen den Materialgesetzen.
description: The two constitutive material models are compared with the help of finite element simulations of an open hole specimen subjected to uniaxial tension. The results of the model by Thomas Flatscher will be taken from the literatures. The same simulations will be carried out by the Abaqus/Explicit solver using the “built-in” VUMAT. The important aspects of an explicit analysis are summarized in chapter 6. The results of the simulations are compared to experimentally obtained results, which are also in the literatures available. The aim of the present work is to identify the source of the deviations between the two constitutive material models. The results of the simulations are compared to experimentally obtained results, which are also in the literatures available. The aim of the present work is to identify the source of the deviations between the two constitutive material models.
Linear effects of the nontraditional Coriolis terms on ITCZ-forced large-scale flow
Creators: name: Ong, Hing
name: Roundy, Paul E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: This paper promotes a measure to validate the hydrostatic approximation via scaling the nontraditional Coriolis term (NCT) in the zonal momentum equation. To demonstrate the scaling, this study simulates large-scale flow forced by a prescribed heat source mimicking the intertropical convergence zone (ITCZ) using a linearized forced-dissipative model. The model solves two similar equations between which the only difference is inclusion of NCTs. The equations are derived using the following approximations: anelastic, equatorial beta-plane, linearized, zonally symmetric, steady, and a constant dissipation coefficient. The large-scale flows simulated with and without NCTs are compared in terms of the meridional-vertical circulation, the zonal wind, and the potential temperature. Both results appear like the Hadley circulation. With the model parameters controlled, the results without NCTs minus with NCTs are linear biases due to omitting NCTs. The most prominent bias is a westerly wind bias in the ITCZ heating region that emerges because omitting NCTs prevents the associated westward acceleration when heating-induced vertical motion is present. The zonal wind bias divided by the zonal wind with NCTs is 0.120 $\pm$ 0.007 in terms of the westerly maximum and 0.0452 $\pm$ 0.0005 in terms of the root mean square (RMS) when the prescribed ITCZ mimics the observed ITCZ in May over the East Pacific. These normalized measures of the zonal wind bias increase with a narrower ITCZ or an ITCZ closer to the equator because of a weaker subtropical jet stream given the same vertical heating profile. This difference can be traced by a nondimensional parameter scaling the ratio of the NCT to the traditional Coriolis term. The scaling encourages restoring NCTs into global models.
description: 13 pages, 6 figures. This is the accepted version of an article that has been published in final form
Elliptic Calabi-Yau Threefolds with Z_3 x Z_3 Wilson Lines
Creators: name: Braun, Volker
name: Ovrut, Burt A.
name: Pantev, Tony
name: Reinbacher, Rene
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: A torus fibered Calabi-Yau threefold with first homotopy group Z_3 x Z_3 is constructed as a free quotient of a fiber product of two dP_9 surfaces. Calabi-Yau threefolds of this type admit Z_3 x Z_3 Wilson lines. In conjunction with SU(4) holomorphic vector bundles, such vacua lead to anomaly free, three generation models of particle physics with a right handed neutrino and a U(1)_{B-L} gauge factor, in addition to the SU(3)_C x SU(2)_L x U(1)_Y standard model gauge group. This factor helps to naturally suppress nucleon decay. The moduli space and Dolbeault cohomology of the threefold is also discussed.
description: 51 pages, 13 figures; v2: references added
Superluminal apparent motions in distant radio sources
Creators: name: Chodorowski, Michal
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We derive the prediction of the standard model of superluminal radio sources for the apparent transverse velocity of a radio source located at redshift z. The apparent velocity of the source is reduced by a factor of 1 + z compared to that of a similar nearby source. The cause of this reduction is recession of the distant source due to the expansion of the universe. The apparent velocity of a source can be estimated from its redshift and proper motion using the values of the Hubble constant and the mean densities of different energy components in the universe. We derive an expression for the velocity valid for the currently favored cosmological model: a flat universe with a nonzero cosmological constant.
description: 14 pages, no figures; matches the version accepted for publication in the American Journal of Physics
Construindo a segurança alimentar? A experiência recente dos CONSADs no Brasil Meridional
Creators: name: Anjos, Flávio Sacco Dos
name: Caldas, Nadia Velleda
name: Anjos, Flávio Sacco Dos
name: Caldas, Nadia Velleda
Publisher: name: Unknown
Year: 2007
Subjects: subject: Agribusiness
subject: alimentary security
subject: rural development
subject: public policies.

description: This work analyzes the recent experience of the “Consortium of Local Development and Alimentary Security” (CONSADs) in the sou-thern Brazil based in a study carried out by Federal University of Pelotas together FAO and Brazilian Social Development Ministry. The research examined 137 development projects aiming to evaluate the similarity degree of their objectives with those of the hunger and alimentary inse-curity combat. The study shows that the CONSAD can represent a way capable to induce the proposition of instruments to attend these impera-tives. Meantime, there are important obstacles to supplant, such as the institutional design and the CONSAD geographic delimitation, as well as the “agrarian bias” of the development projects, the excessive protago-nism of public agents and the misunderstandings about to the concept of alimentary security from the point of view of the involved social actors.
Layer effects on the magnetic textures in magnets with local inversion asymmetry
Creators: name: van Walsem, Etienne
name: Duine, Rembert A.
name: Guimarães, Marcos H. D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magnets with broken local inversion symmetries are interesting candidates for chiral magnetic textures such as skyrmions and spin spirals. The property of these magnets is that each subsequent layer can possess a different Dzyaloshniskii-Moriya interaction (DMI) originating from the local inversion symmetry breaking. Given that new candidates of such systems are emerging, with the Van der Waals crystals and magnetic multilayer systems, it is interesting to investigate how the chiral magnetic textures depend on the number of layers and the coupling between them. In this article, we model the magnetic layers with a classical Heisenberg spin model, where the sign of the DMI alternates for each consecutive layer. We use Monte Carlo simulations to examine chiral magnetic textures and show that the pitch of magnetic spirals is influenced by the interlayer coupling and the number of layers. We observe even-odd effects in the number of layers, where we observe a suppression of the spin spirals for even layer numbers. We give an explanation for our findings by proposing a net DMI in systems with strongly coupled layers. Our results can be used to determine the DMI in systems with a known number of layers, and for new technologies based on the tunability of the spiral wave length.
description: 8 pages, 8 figures and 2 tables
Second Order Gauge Invariant Perturbation Theory -- Perturbative curvatures in the two-parameter case --
Creators: name: Nakamura, Kouji
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Based on the gauge invariant variables proposed in our previous paper [K. Nakamura, Prog. Theor. Phys. vol.110 (2003), 723.], some formulae of the perturbative curvatures of each order are derived. We follow the general framework of the second order gauge invariant perturbation theory on arbitrary background spacetime to derive these formulae. These perturbative curvatures do have the same form as the definitions of gauge invariant variables for arbitrary perturbative fields which are previously proposed. As a result, we explicitly see that any perturbative Einstein equations are given in terms of gauge invarinat form. We briefly discuss physical situations to which this framework should be applied.
description: 31 pages, 1 figure, PTPTEX (ptptex.cls ver 0.9);Some typos in the published version are corrected
Fast Blast Wave and Ejecta in the Young Core-Collapse Supernova Remnant MSH 15-52/RCW 89
Creators: name: Borkowski, Kazimierz J.
name: Reynolds, Stephen P.
name: Miltich, William
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: One of the youngest known remnants of a core-collapse supernova (SN) in our Galaxy is G320.4$-$1.2/MSH 15-52 containing an energetic pulsar with a very short (1700 yr) spindown age and likely produced by a stripped-envelope SN Ibc. Bright X-ray and radio emission north of the pulsar overlaps with an H$α$ nebula RCW 89. The bright X-rays there have a highly unusual and quite puzzling morphology, consisting of both very compact thermally emitting knots and much more diffuse emission of nonthermal origin. We report new X-ray observations of RCW 89 in 2017 and 2018 with Chandra that allowed us to measure the motions of many knots and filaments on decade-long time baselines. We identify a fast blast wave with a velocity of $(4000 \pm 500)d_{5.2}$ km/s ($d_{5.2}$ is the distance in units of 5.2 kpc) with a purely nonthermal spectrum, and without any radio counterpart. Many compact X-ray emission knots are moving vary fast, with velocities as high as 5000 km/s, predominantly radially away from the pulsar. Their spectra show that they are Ne- and Mg-rich heavy-element SN ejecta. They have been significantly decelerated upon their recent impact with the dense ambient medium north of the pulsar. We see fast evolution in brightness and morphology of knots in just a few years. Ejecta knots in RCW 89 resemble those seen in Cas A at optical wavelengths in terms of their initial velocities and densities. They might have the same origin, still not understood but presumably related to stripped-envelope SN explosions themselves.
description: 7 pages, 4 figures, minor revisions, accepted for publication in ApJ Letters
Uniform support for modeling crosscutting structure
Creators: name: Tkatchenko, Maria A.
Publisher: name: University of British Columbia
Year: 2010

description: We propose bottom-up support for modeling crosscutting structure in UML by adding a simple join point model to the meta-model. This supports built-in crosscutting modeling constructs such as class and sequence diagrams, collaborations, and state machines. It also facilitates adding new kinds of crosscutting modeling constructs such inter-type declarations and advice. A simple planner tool produces a uniform representation of the crosscutting structure, which can then be displayed or analyzed in a variety of ways. We demonstrate a couple of simple automated analysis tools which take advantage of the exposed crosscutting structure. We also discuss how support for advice could be added to the meta-model and planner, and the semantic differences between advice in UML and Aspect J.
Análise de transmissão de preços do mercado atacadista de melão do Brasil
Creators: name: Mayorga, Rodrigo De Oliveira
name: Khan, Ahmad Saeed
name: Mayorga, Ruben Dario
name: Lima, Patricia Veronica Pinheiro Sales
name: Margarido, Mario Antonio
name: Mayorga, Rodrigo De Oliveira
name: Khan, Ahmad Saeed
name: Mayorga, Ruben Dario
name: Lima, Patricia Veronica Pinheiro Sales
name: Margarido, Mario Antonio
Publisher: name: Unknown
Year: 2007
Subjects: subject: Agribusiness
subject: Wholesale market
subject: price transmission
subject: VAR model.

description: The present study has the purpose to analyze the relationship among wholesale market of yellow melon in Brazil. Time series metho-ds, unit root test, Johansen cointegration test, Vectorial Autoregressive models (VAR), variance decomposition of prediction error and impulse response function were used to analyze the price transmission among these markets. The analyzed period embraces January 2001 to December 2005. The results showed that, despite Açu/Mossoró-RN and Baixo Ja-guaribe-CE represents the national biggest melon production areas, who-lesale prices deviations from the Supply Centers of Natal and Fortaleza, didn’t affect in a signiﬁcant way the other markets studied. On the other hand, price variation of the CEAGESP (Companhia de Entrepostos e Ar-mazéns Gerais de São Paulo), affects all the others wholesale markets analyzed. Therefore, the CEAGESP, representing national wholesalers, it being the biggest intermediary of the country, commands the Brazilian yellow melon market, establishing, in practice, an oligopolistic market.
ISO observations of the Galactic center Interstellar Medium: neutral gas and dust
Creators: name: Rodriguez-Fernandez, N. J
name: Martin-Pintado, J.
name: Fuente, A.
name: Wilson, T. L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The 500 central pc of the Galaxy (hereafter GC) exhibit a widespread gas component with a kinetic temperature of 100-200 K. The bulk of this gas is not associated to the well-known thermal radio continuum or far infrared sources like Sgr A or Sgr B. How this gas is heated has been a longstanding problem. With the aim of studying the thermal balance of the neutral gas and dust in the GC, we have observed 18 molecular clouds located at projected distances far from thermal continuum sources with the Infrared Space Observatory (ISO). In this paper we present observations of several fine structure lines and the full continuum spectra of the dust between 40 and 190 microns. A warm dust component with a temperature between 27 and 42 K is needed to fit the spectra. We have compared the gas and the dust emission with the predictions from J-type and C-type shocks and photodissociation region (PDRs) models. We conclude that the dust and the fine structure lines observations are best explained by a PDR with a density of 10$^3$ cm^-3 and an incident far-ultraviolet field 10$^3$ times higher than the local interstellar radiation field. PDRs can naturally explain the discrepancy between the gas and the dust temperatures. However, these PDRs can only account for 10-30% of the total H2 column density with a temperature of ~ 150 K. We discuss other possible heating mechanisms (short version).
description: Accepted for publication by A&A
title: Compressed sensing for graph signals
Creators: name: Tawfik, Ahmed
Publisher: name: TU Wien
Year: 2018
Subjects: subject: Compressed Sensing
subject: Graph Signals
subject: Compressed Sensing
subject: Graph Signals

description: In this thesis we are going to tackle the problem of estimating a sparse graph signal with an unknown frequency support set of known size K from a sampled noisy version. Not knowing the location of the non-zero Fourier coefficients and by taking a number M of samples larger than K will give us a compressed sensing problem. The Bayesian Approximate Message Passing (BAMP) algorithm is used to solve the compressed sensing problem and recover the original signal from few coefficients.
Chandra Orion Ultradeep Project: Observations and Source Lists
Creators: name: Getman, K. V.
name: Flaccomio, E.
name: Broos, P. S.
name: Grosso, N.
name: Tsujimoto, M.
name: Townsley, L.
name: Garmire, G. P.
name: Kastner, J.
name: Li, J.
name: Harnden,, F. R.
name: Wolk, S.
name: Murray, S. S.
name: Lada, C. J.
name: Muench, A. A.
name: McCaughrean, M. J.
name: Meeus, G.
name: Damiani, F.
name: Micela, G.
name: Sciortino, S.
name: Bally, J.
name: Hillenbrand, L. A.
name: Herbst, W.
name: Preibisch, T.
name: Feigelson, E. D.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a description of the data reduction methods and the derived catalog of more than 1600 X-ray point sources from the exceptionally deep January 2003 Chandra X-ray Observatory observation of the Orion Nebula Cluster and embedded populations around OMC-1. The observation was obtained with Chandra's Advanced CCD Imaging Spectrometer (ACIS) and has been nicknamed the Chandra Orion Ultradeep Project (COUP). With an 838 ks exposure made over a continuous period of 13.2 days, the COUP observation provides the most uniform and comprehensive dataset on the X-ray emission of normal stars ever obtained in the history of X-ray astronomy.
description: 52 pages, 11 figures, 12 tables. Accepted for publication in ApJS, special issue dedicated to Chandra Orion Ultradeep Project. A version with high quality figures can be found at http://www.astro.psu.edu/users/gkosta/COUP_Methodology.pdf
Robust converter-fed motor control based on active rejection of multiple disturbances
Creators: name: Madonski, Rafal
name: Łakomy, Krzysztof
name: Stankovic, Momir
name: Shao, Sally
name: Yang, Jun
name: Li, Shihua
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this work, an advanced motion controller is proposed for buck converter-fed DC motor systems. The design is based on an idea of active disturbance rejection control (ADRC) with its key component being a custom observer capable of reconstructing various types of disturbances (including complex, harmonic signals). A special formulation of the proposed design allows the control action to be expressed in a concise and practically appealing form reducing its implementation requirements. The obtained experimental results show increased performance of the introduced approach over conventionally used methods in tracking precision and disturbance rejection, while keeping similar level of energy consumption. A stability analysis using theory of singular perturbation further supports the validity of proposed control approach.
description: 30 pages, 7 figures, 1 table