cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
How Do Changes in Market Fundamentals Affect Hedging in US Live Cattle Markets?
Creators: name: Ac-Pangan, Walter
name: Coffey, Brian K.
name: Ac-Pangan, Walter
name: Coffey, Brian K.
Publisher: name: Unknown
Year: 2021
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: hedging
subject: basis
subject: risk management
subject: live cattle
subject: future contracts

description: An increase in basis variability complicates hedging price risk management and causes hedging effectiveness to decrease. This is one reason that volatility in US live cattle basis has raised concerns over the last decade. The purpose of this analysis is to evaluate how changes in market fundamentals and price momentum impact live cattle hedging effectiveness and how the impacts vary regionally. This study used weekly data series to estimate regional hedonic models where the dependent variable was Basis Prediction Error, which serves as a hedging effectiveness measure, and the independent variables represent the shifts in the market fundamentals. The results suggest that a positive change in factors such as the thinness of the negotiated market and cost of gain will increase the Basis Prediction Errors. In contrast, variables such as the average weight per head of the live cattle marketed and delivery costs have an opposite influence. The analysis of the monetary impact of explanatory variables shocks showed that changes in the costs of gains have a larger monetary impact on the basis for Kansas. For Nebraska are the changes in delivery costs, and the Iowa-Minnesota region is more sensitive to changes in the current premium for high-quality beef.
Combining Region-Specific Supply Chains with Geo-Located PV Electricity Production for Life Cycle Assessment of Worldwide Crystalline Silicon Photovoltaic Systems in ENVI-PV v2.0
Creators: name: Perez-Lopez, P.
name: Gschwind, B.
name: Frischknecht, R.
name: Stolz, P.
name: Mehl, C.
name: Payeur, M.
name: Heath, G.
name: Blanc, I.
Publisher: name: WIP
Year: 2019
Subjects: Photovoltaic Modules and BoS Components
Sustainability and Recycling

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 958-963
description: The development of efficient future energy mixes needs the support of decision tools providing objective information on environmental impacts of existing and emerging systems. In life cycle assessments, environmental impacts during all stages of the life cycle of a product or a service are systematically inventoried and analyzed. Existing tools giving a large audience access to environmental results based on reported life cycle inventories of photovoltaic systems are mainly based on average models that fail to account for geographical dependence in the manufacture stage. The online tool presented here consists of an improved version of the Web service ENVI-PV, developed in the framework of Task 12 of the International Energy Agency Photovoltaic Power Systems Program. ENVI-PV v2.0 (http://viewer.webservice-energy.org/envi-pv_v2.0/) adds a new feature to allow the evaluation of dependencies of environmental results on the manufacturing region of crystalline silicon photovoltaic modules, while providing a selection of environmental impact categories based on recent advances in line with Task 12. The results show the decisive role of manufacturer selection on the environmental performance of photovoltaic systems and the importance of accounting for geographical factors in the environmental assessment of these technologies.
Linear sigma model at finite density in the 1/N expansion to next-to-leading order
Creators: name: Andersen, Jens O.
name: Brauner, Tomas
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study relativistic Bose-Einstein condensation at finite density and temperature using the linear sigma model in the one-particle-irreducible 1/N-expansion. We derive the effective potential to next-to-leading (NLO) order and show that it can be renormalized in a temperature-independent manner. As a particular application, we study the thermodynamics of the pion gas in the chiral limit as well as with explicit symmetry breaking. At nonzero temperature we solve the NLO gap equation and show that the results describe the chiral-symmetry-restoring second-order phase transition in agreement with general universality arguments. However, due to nontrivial regularization issues, we are not able to extend the NLO analysis to nonzero chemical potential.
description: 12 pages, REVTeX4, 6 eps figures; v2: added references + minor corrections throughout the text; version to appear in Phys. Rev. D
On the Temperature of Gravitation in the de Sitter Space-Time
Creators: name: Santos, A. F.
name: Ulhoa, S. C.
name: Furtado, T. F.
name: Khanna, Faqir C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The temperature associated with gravitation as presented in the Unruh effect and Hawking temperature serves to link different areas of physics, such as gravity, statistical mechanics, and quantum physics. In this paper, teleparallel gravity is considered to study temperature effects on the de Sitter space-time. The effects of temperature are introduced using the Thermo Field Dynamics (TFD) formalism. The gravitational Stefan-Boltzmann law is obtained. Then the temperature of gravitation in the de Sitter space-time is calculated. Here an Unruh-type effect is discussed. This effect relates the temperature and the acceleration of a particle in the de Sitter space-time. The gravitational Casimir effect is calculated. The result shows that there is a transition between an attractive and a repulsive Casimir effect.
description: 15 pages, 1 figure, accepted for publication in EPJC
Additional file 2 of Associations between ambient temperature and adult asthma hospitalizations in Beijing, China: a time-stratified case-crossover study
Creators: name: Chen, Yuxiong
name: Kong, Dehui
name: Fu, Jia
name: Zhang, Yongqiao
name: Zhao, Yakun
name: Liu, Yanbo
name: Chang, Zhen’ge
name: Liu, Yijie
name: Liu, Xiaole
name: Xu, Kaifeng
name: Jiang, Chengyu
name: Fan, Zhongjie
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Science Policy

description: Additional file 2: Figure S1. Lag-cumulative exposure–response associations between daily mean temperature and total adult asthma hospitalizations in Beijing, 2012–2015 using different maximum lag days in the distributed lag non-linear model. Figure S2. Lag-cumulative exposure–response associations between daily minimum temperature and total adult asthma hospitalizations in Beijing, 2012–2015. Figure S3. Lag-cumulative exposure–response associations between daily maximum temperature and total adult asthma hospitalizations in Beijing, 2012–2015. Figure S4. Lag-cumulative exposure–response associations between daily mean apparent temperature and total adult asthma hospitalizations in Beijing, 2012–2015.
On implementing the ISO virtual terminal protocol for a UNIX 4.2 BSD environment
Creators: name: Ng, Steve Chi Ho
Publisher: name: University of British Columbia
Year: 2010

description: Virtual terminal protocols provide remote terminal-oriented communications between network users. They are designed to allow terminals and hosts on a heterogeneous network to communicate without requiring one side to "know" the terminal characteristics handled by the other side. With the diversification of different types of terminals, there is a tremenduous interest in research and design of such protocols. In this thesis we consider the design and implementation of a virtual terminal protocol, that is, the ISO VTP described by ISO documents DIS 9040 and DIS 9041. In particular, we implemented and tested the usefulness of the ISO VTP under the UNIX environment. We conclude that the ISO VTP is useful in the UNIX environment. However, several inconsistencies and incomplete information in the ISO documentation, that require further revisions by the standard committee, are identified. Furthermore, we compare the ISO VTP with other terminal protocols, such as ARPANET TELNET and CCITT PAD Facility, pointing out their differences and short-comings.
Alignment procedure of the LHCb Vertex Detector
Creators: name: Viret, S.
name: Parkes, C.
name: Gersabeck, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: LHCb is one of the four main experiments of the Large Hadron Collider (LHC) project, which will start at CERN in 2008. The experiment is primarily dedicated to B-Physics and hence requires precise vertex reconstruction. The silicon vertex locator (VELO) has a single hit precision of better than 10 micron and is used both off-line and in the trigger. These requirements place strict constraints on its alignment. Additional challenges for the alignment arise from the detector being retracted between each fill of the LHC and from its unique circular disc r/phi strip geometry. This paper describes the track based software alignment procedure developed for the VELO. The procedure is primarily based on a non-iterative method using a matrix inversion technique. The procedure is demonstrated with simulated events to be fast, robust and to achieve a suitable alignment precision.
description: accepted for publication in NIMA
Fluxes of Higher-spin Currents and Hawking Radiations from Charged Black Holes
Creators: name: Iso, Satoshi
name: Morita, Takeshi
name: Umetsu, Hiroshi
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This is an extended version of the previous paper (hep-th/0701272). Quantum fields near horizons can be described in terms of an infinite set of two-dimensional conformal fields. We first generalize the method of Christensen and Fulling to charged black holes to derive fluxes of energy and charge. These fluxes can be obtained by employing a conformal field theory technique. We then apply this technique to obtain the fluxes of higher-spin currents and show that the thermal distribution of Hawking radiation from a charged black hole can be completely reproduced by investigating transformation properties of the higher-spin currents under conformal and gauge transformations.
description: 15 pages
NMSSM neutralino dark matter
Creators: name: Teixeira, Ana M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the viability of the lightest neutralino as a dark matter candidate in the Next-to-Minimal Supersymmetric Standard Model. Taking into account accelerator constraints as well as bounds on low-energy observables, and imposing consistency with present bounds on the neutralino relic density, we address the prospects for the direct detection of neutralino dark matter. We find regions of the allowed parameter space where the neutralino detection cross section is within the reach of dark matter detectors, essentially owing to the presence of very light singlet-like Higgses, and to either singlino dominated or very light neutralinos.
description: 4 pages, 2 figures. Presented at 13th International Symposium on Particles, Strings and Cosmology (PASCOS 07), London, England, 2-7 Jul 2007
Identifying the Purpose and Success of Dairy Futures Contracts: Are Class III and Cheese Futures Contracts Serving Distinct Markets?
Creators: name: Tejeda, Hernan A.
name: Trujillo-Barrera, Andres
name: Fortenbery, T. Randall
name: Tejeda, Hernan A.
name: Trujillo-Barrera, Andres
name: Fortenbery, T. Randall
Publisher: name: Unknown
Year: 2021
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: Class III milk
subject: Cheese futures markets
subject: hedging
subject: liquidity
subject: price volatility

description: Weekly cash cheese prices are highly correlated with weekly average cheese futures prices. In addition, cash cheese prices exhibit a high degree of correlation with weekly average Class III milk futures. Lastly, cheese futures and Class III milk futures are highly correlated. Based on trading volume, the Class III milk futures market is more than five times larger than the cheese futures market, and yet both are quite thin compared to derivative markets for grains and cattle. Moreover, less than two percent of U.S. cheese production between 2009 and 2018 was traded in the cheese futures market. Given the rather small number of trades in both Class III and cheese futures, and their high level of price correlation, one wonders whether the separate dairy contracts are serving unique and distinct markets. Would it be (more) beneficial if only one of the contracts existed? If the markets are effectively redundant, the elimination of one could increase liquidity in the other, and potentially reduce overall price volatility. The objective of this paper is to investigate whether its possible market performance could be improved through the trading of a single dairy futures contract, and develop a baseline for evaluating the potential economic and financial benefits that would result.
Impact of POCl3 Diffusion Process Parameters on Oxygen Precipitation in Czochralski-grown Silicon
Creators: name: Maus, S.
name: Lohmüller, S.
name: Mu, D.
name: Schön, J.
name: Niewelt, T.
name: Wolf, A.
name: Preu, R.
Publisher: name: WIP
Year: 2019
Subjects: Silicon Materials and Cells
Homojunction Solar Cells

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 151-156
description: Oxygen precipitates can be formed in Czochralski-grown silicon (Cz-Si) wafers during high temperature processes. They decrease the bulk charge carrier lifetime and thereby reduce the efficiency of the affected devices. The most relevant process for passivated emitter and rear cells is the POCl3 diffusion. Therefore the influence of its process parameters on oxygen precipitation is highly relevant for industrial cell manufacturing. In this work, we investigate the impact of distinct POCl3 diffusion parameters on oxygen precipitation in both p-type and n-type Cz-Si. A full factorial variation of the drive-in parameters, such as temperature and duration, based on an industry relevant POCl3 diffusion process, is performed. The results show that the recombination activity of oxygen precipitates is increasing with both the temperature and the duration of the drive-in sequence. The oxygen diffusion length LOi during the process is identified to be a well-suited measure for the growth of oxygen precipitates in susceptible material and a threshold of LOi < 0,3 µm is proposed to limit detrimental effects on device performance. Similar trends for the oxygen precipitation were observed for p-type and n-type doped Cz-Si.
Slow wave resonance in periodic stacks of anisotropic layers
Creators: name: Figotin, Alex
name: Vitebskiy, Ilya
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We consider transmission band edge resonance in periodic layered structures involving birefringent layers. Previously we have shown that the presence of birefringent layers with misaligned in-plane anisotropy can dramatically enhance the performance of the photonic-crystal Fabry-Perot resonator. It allows to reduce its size by an order of magnitude without compromising on its performance. The key characteristic of the enhanced photonic-crystal cavity is that its Bloch dispersion relation displays a degenerate photonic band edge, rather than only regular ones. This can be realized in specially arranged stacks of misaligned anisotropic layers. On the down side, the presence of birefringent layers results in the Fabry-Perot resonance being coupled only with one (elliptic) polarization component of the incident wave, while the other polarization component is reflected back to space. In this paper we show how a small modification of the periodic layered array can solve the above fundamental problem and provide a perfect impedance match regardless of the incident wave polarization, while preserving the giant transmission resonance, characteristic of a degenerate photonic band edge. Both features are of critical importance for a variety of practical applications, including antennas, light amplification, optical and microwave filters, etc.
description: To be submitted to Phys. Rev. E
MIS Structures for Solar Cells Perimeter Passivation
Creators: name: Delamarre, A.
name: Sodabanlu, H.
name: Watanabe, K.
name: Sugiyama, M.
name: Guillemoles, J.-F.
Publisher: name: WIP
Year: 2019
Subjects: Perovskites, other Non-Silicon-Based Photovoltaics and Multi-Junction Devices
III-V and Related Compound Semiconductor Based Devices

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 615-617
description: Perimeter recombination takes place in all photovoltaic architectures, its detrimental effect increasing with the perimeter to area ratio. A new efficient passivation method is introduced here, inspired by the working principle of MOSFETs. It consists in a Metal Insulator stack, deposited on top of the Semiconductor structure. As a transistor, it acts as a switch to prevent the flow of majority carriers towards the defective side walls. Simulation results show that the detrimental effect of perimeter recombination can be reduced by half in the particular case of a GaAs solar cell under one sun illumination. Because no chemical treatment is involved, our MIS based passivation solution can be adapted to various photovoltaic materials as a perspective. A possible additional application will be devices working under intense illumination, where resistive effects are a limiting factor.
A Hard Look At Relativistic Reverberation in MCG-5-23-16 & SWIFT J2127.4+5654: Testing the Lamp-Post Model
Creators: name: Zoghbi, A.
name: Miller, J. M.
name: Cackett, E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: X-ray reverberation mapping has emerged as a new tool to probe accretion in AGN, providing a potentially powerful probe of accretion at the black hole scale. The lags, along with relativistic spectral signatures are often interpreted in light of the lamp-post model. Focusing specifically on testing the prediction of the relativistic reverberation model, we have targeted several of the brightest Seyfert Galaxies in X-rays with different observing programs. Here, we report the results from two large campaigns with NuSATR targeting MCG-5-23-16 and SWIFT J2127.4+5654 to test the model predictions in the 3-50 keV band. These are two of three sources that showed indications of a delayed Compton hump in early data. With triple the previously analyzed exposures, we find no evidence for relativistic reverberation in MCG-5-23-16, and the energy-dependent lags are consistent with a log-linear continuum. In SWIFT J2127.4+5654, although a continuum-only model explains the data, the relativistic reverberation model provides a significant improvement to the energy and frequency-dependent lags, but with parameters that are not consistent with the time-averaged spectrum. This adds to mounting evidence showing that the lag data is not consistent with a static lamp-post model.
description: Accepted for publication in ApJ. Codes and data used to produce the results can be found in the following repository: https://github.com/zoghbi-a/relativistic-reverberation-in-mcg-5-23-16-and-swift-j127.4-5654
Correlations Go to One in a Crisis: Did the COVID 19 Market Crash Bring Cattle Futures and Equities Together?
Creators: name: Mefford, Eli
name: Mallory, Mindy
name: Mefford, Eli
name: Mallory, Mindy
Publisher: name: Unknown
Year: 2021
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: Covid-19
subject: Cointegration
subject: Vector Error Correction Models
subject: Cattle Futures
subject: Commodity Co-Movement

description: We investigate the impacts of Covid-19 on cattle futures markets during the first half of 2020. This study focuses on cattle futures response to the equities crash in March of 2020 and the Covid-linked production delays at beef packing plants. We observe that the initial declines in cattle futures began prior to the onset of beef packing plant shutdowns. Analysis comparing live cattle contracts, feeder cattle contracts, and corn contracts to the E-Mini S&P 500 futures contract finds evidence that the S&P 500 had a significant impact on cattle prices during March of 2020. These results are an example of increased cross asset correlation during periods of financial distress.
ASN.1-C compiler for automatic protocol implementation
Creators: name: Yang, Yueli
Publisher: name: University of British Columbia
Year: 2010

description: One of the basic requirements of communication protocols in a heterogeneous computer network is a standard external data-transfer representation. Abstract Syntax Notation One (ASN.1) has been widely used in international standard specifications. Its transfer-syntax of Basic Encoding Rules (BER) is applied as the standard external data representation. This thesis presents an efficient BER implementation, called the ED library. The ED library includes a number of encoding and decoding routines that may be used as primitive functions to compose encoders and decoders for arbitrarily complicated ASN.1 data-types. The Performance of the ED library is measured and discussed. Based on the ED library, an ASN.1-C compiler, called CASN1, is designed and implemented to release communication software programmers from the arduous work of translating protocol-defined data-types and constructing their encoders and decoders. Given an ASN.1 protocol specification, CASN1 automatically translates the input ASN.1 modules into C and generates the BER encoders and decoders for the protocol denned data-types. This thesis discusses the design principles, user interface, internal structures, and the implementation and of CASN1. Example applications are given. Both the ED library and CASN1 are implemented in C on UNIX 4.2 BSD using the YACC and LEX tools.
The Use of Grammatical Collocations with Prepositions and Attitudes towards Collocations Learning of Thai EFL Undergraduate Students
Creators: name: Suthipong Pisitsenakul
name: Wasan Khamnok
Publisher: name: Rangsit University, Pathum Thani, Thailand
Year: 2019
Subjects: Collocations
Grammatical Collocations
Attitudes towards Collocations Learning
Thai EFL undergraduate students

description: RANGSIT JOURNAL OF EDUCATIONAL STUDIES, 6, 1, 51-64
Thermal gravitational waves
Creators: name: Sivaram, C.
name: Arun, Kenath
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: There is a lot of current interest in sources of gravitational waves and active ongoing projects to detect such radiation, such as the LIGO project. These are long wavelength, low frequency gravitational waves. LISA would be sensitive to much longer wavelengths and lower fluxes. However compact stellar objects can generate high frequency thermal gravitational radiation, which in the case of hot neutron stars can be high. Also white dwarfs and main-sequence stars can generate such radiation from plasma-Coulomb collisions. Again gamma ray bursts and relativistic jets could also be sources of such radiation. Terminal stages of evaporating black holes could also generate high frequency gravitational radiation. A comparative study is made of the thermal gravitational wave emission from all of the above sources, and the background flux is estimated. The earliest phases of the universe close to the Planck scale would also leave remnant thermal gravitational waves. The integrated thermal gravitational flux as the universe expands is also estimated and compared with that from all the discrete sources discussed above. Possible schemes to detect such sources of high frequency thermal gravitational radiation are discussed and the physical principles involved are elaborated.
description: 20 pages, 57 equations
Roles, Characteristics and Professional Needs of Instructional Assistants in an International School
Creators: name: Thanyapatra Soisuwan
name: Anchalee Chayanuvat
Publisher: name: Rangsit University, Pathum Thani, Thailand
Year: 2019
Subjects: Roles, Characteristics, Professional needs, Instructional Assistants, International Schools

description: RANGSIT JOURNAL OF EDUCATIONAL STUDIES, 6, 1, 65-84
The proton low-mass microquasar: high-energy emission
Creators: name: Romero, Gustavo E.
name: Vila, Gabriela S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A population of unidentified gamma-ray sources is forming a structure resembling a halo around the Galactic center. These sources are highly variable, and hence they should be associated with compact objects. Microquasars are objects undergoing accretion with relativistic jets; if such an object has a low-mass, evolved, donor star, it might be found in the Galactic halo. If these low-mass microquasars can generate detectable gamma-ray emission, then they are natural candidates to account for the halo high-energy sources. We aim to construct models for high-energy emission of low-mass microquasars, which could produce a significant luminosity in the gamma-ray domain. We consider that a significant fraction of the relativistic particles in the jets of low-mass microquasars are protons and then we study the production of high-energy emission through proton synchrotron radiation and photopion production. Photopair production and leptonic processes are considered as well. We compute a number of specific models with different parameters to explore the possibilities of this scenario.} We find that important luminosities, in the range of $10^{34}-10^{37}$ erg s$^{-1}$, can be achieved by proton synchrotron radiation in the Gamma-Ray Large Area Space Telescope (GLAST) energy range, and lower, but still significant luminosities at higher energies for some models. We conclude that the "proton microquasar" model offers a very interesting alternative to account for the halo gamma-ray sources and presents a variety of predictions that might be tested in the near future by instruments like GLAST, the High-Energy Stereoscopic System II (HESS II), the Major Atmospheric Gamma-ray Imaging Cherenkov telescope II (MAGIC II), and neutrino telescopes like IceCube.
description: 11 pages, 7 figures, final version, accepted for publication in A&A
Cenários prospectivos da gestão universitária em tempos de pandemia: as Universidades Estaduais da Bahia e as políticas de permanência estudantil
Creators: name: DE SOUZA, ANA CLEIDE
name: Mota Júnior, Antônio de Macêdo
name: Oliveira, Cristiane Neves de
name: Mattos, Lilia Maria Carvalho
Publisher: name: figshare
Year: 2021
Subjects: subject: 130304 Educational Administration, Management and Leadership
subject: FOS: Educational sciences

description: Este estudo exploratório-descritivo, bibliográfico e documental aborda o tema das políticas de permanência estudantil, implementadas pela gestão das instituições públicas de educação superior, para atender as agendas de inclusão digital e ensino remoto, durante o período da pandemia da Covid-19. Desta forma, o trabalho buscou situar as ações e políticas sobre o referido tema em duas das Universidades Estaduais da Bahia (UEBA), nessa crise sanitária mundial. Os resultados mostraram que, para a continuidade do ensino superior, as Universidades precisaram implementar ações de inclusão digital, com recursos do próprio orçamento, visando à garantia da equidade de acesso às aulas remotas para estudantes de grupos socioeconômicos mais vulneráveis. O que evidencia lacunas sociais que precisam ser cobertas pelas políticas de permanência estudantil, principalmente em função do acesso à internet não universalizado. Assim, com os olhos postos no futuro, ante as possibilidades de continuidade de ensino hibrido em algumas atividades, mesmo após o fim da crise sanitária, levantam-se questões sobre a necessidade de adequações nessas políticas, já que essas Universidades vivenciam sucessivas restrições orçamentárias e financeiras, para que os recursos, ora demandados para inclusão digital, possam fazer parte de seus orçamentos anuais.
بررسی طراحی خانه های دوره قاجار و پهلوی شهر شیراز با رویکرد معماری همساز با اقلیم
Creators: name: Mahabadi, Kamran Rezaeizadeh
name: Kheiri, Ali
Publisher: name: figshare
Year: 2021
Subjects: subject: 120101 Architectural Design
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: 120104 Architectural Science and Technology (incl. Acoustics, Lighting, Structure and Ecologically Sustainable Design)
subject: FOS: Civil engineering
subject: 129999 Built Environment and Design not elsewhere classified

description: خانه های مسکونی دوره ی قاجاریه شیراز، در پلان، چیدمان فضایی و ویژگی های معماری، دارای اصول و تناسبات عددی مشترکی هستند که برخی از این اصول در کنار نقش عملکردی، ارتباط تنگاتنگی با شرایط اقلیمی منطقه دارد لذا با تحقیق میدانی و کتابخانه ای به تجزیه و تحلیل پلان های معماری و اجزاء سازنده از قبیل اتاق ها، حیاط ها، حوض و باغچه ی خانه هایی از بافت تاریخی شیراز و نمونه هایی از محله ی تاریخی سرباغ از لحاظ ارتباطات فضایی، عددی و اقلیمی پرداخته شده است. پژوهش حاضر در پی شناخت میزان نقش اقلیم در الگوی طراحی خانه های شیراز در عصر قاجار است که به منظور دستیابی به این هدف و الگوهای ساختاری، تناسبات و نحوه ی ارتباطات فضایی آنها با یکدیگر و چگونگی ارتباط آنها با مسایل اقلیمی می پردازد. در نهایت با شناخت عناصر اقلیمی و معماری همساز با اقلیم در این بناها می توان تکنیک های به کار رفته در آنها را در معماری جدید در جهت رسیدن به اهداف معماری پایدار به کار گرفت.
Performance of the LHCb Vertex Detector Alignment Algorithm determined with Beam Test Data
Creators: name: Gersabeck, M.
name: Viret, S.
name: Parkes, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: LHCb is the dedicated heavy flavour experiment at the Large Hadron Collider at CERN. The partially assembled silicon vertex locator (VELO) of the LHCb experiment has been tested in a beam test. The data from this beam test have been used to determine the performance of the VELO alignment algorithm. The relative alignment of the two silicon sensors in a module and the relative alignment of the modules has been extracted. This alignment is shown to be accurate at a level of approximately 2 micron and 0.1 mrad for translations and rotations, respectively in the plane of the sensors. A single hit precision at normal track incidence of about 10 micron is obtained for the sensors. The alignment of the system is shown to be stable at better than the 10 micron level under air to vacuum pressure changes and mechanical movements of the assembled system.
description: accepted for publication in NIMA
Transitions involving conical magnetic phases in a model with bilinear and biquadratic interactions
Creators: name: Massidda, Vittorio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In a previous work a model was proposed for the phase transitions of crystals with localized magnetic moments which at low temperature have a "conical" arrangement that at higher T transforms into a more symmetrical structure (depending on the compound) before becoming totally disordered. The model assumes bilinear and biquadratic interactions between magnetic moments up to the fifth neighbours, and for any given T the structure with the least free energy is obtained by a mean-field approximation (MFA). The interaction constants are derived from ab initio energy calculations. In this work we improve upon that model modifying the MFA in such a way that a continuous (instead of discontinuous) spectrum of excited states is available to the system. In the previous work, which dealt with LaMn_2Ge_2 and LaMn_2Si_2, we found that transitions to different structures can be obtained for increasing T, in good qualitative agreement with experiment. The critical temperatures, however, were exaggerately high. With the new MFA we obtain essentially the same behaviour concerning the phase transitions, and critical temperatures much closer to the experimental ones.
description: 8 pages, no figures
Direct Measurement of Moisture Ingress in PV Laminates
Creators: name: Kyranaki, N.
name: Whalley, D.C.
name: Hutt, D.A.
name: Gottschalg, R.
name: Betts, T.R.
Publisher: name: WIP
Year: 2019
Subjects: Photovoltaic Modules and BoS Components
PV Module Design, Manufacture, Performance and Reliability

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 1045-1049
description: This work demonstrates a novel method for the measurement of moisture ingress into PV laminates, by the use of humidity indicator cards encapsulated within the structure. The humidity indicator cards change colour due to moisture exposure, which is quantified by processing images of the samples taken with a camera. To allow the variance of colour to be matched to specific levels of humidity, a detailed calibration was first performed. To achieve this, laminates with the structure [EVA-humidity indicator card-EVA-glass] were stabilised in an environmental chamber at 85ºC at increasing levels of relative humidity. The colour change of the humidity indicator cards corresponding to the relative humidity inside the chamber was then plotted on RGB colour space diagrams. The purpose of this work is the development of a measurement method for the moisture that accumulates at the front side of PV cells, for the experimental verification of simulations of the moisture ingress into PV modules and the better understanding of degradation modes related to corrosion.
Spatially resolved spectroscopy across stellar surfaces. V. Observational prospects: Toward Earth-like exoplanet detection
Creators: name: Dravins, Dainis
name: Ludwig, Hans-Günter
name: Freytag, Bernd
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Testing 3D hydrodynamic models of stellar atmospheres is feasible by retrieving spectral line shapes across stellar disks, using differential spectroscopy during exoplanet transits. From synthetic data at hyper-high spectral resolution, characteristic patterns for FeI and FeII lines were identified in Paper IV from 3D models spanning T=3964-6726K (spectral types approx. K8V-F3V). The observability of patterns among lines of different strength, excitation potential and ionization level are now examined, as observed at ordinary spectral resolutions and in the presence of noise. Time variability in 3D atmospheres induces changes in spectral-line parameters, some of which are correlated. An adequate calibration could identify proxies for the jitter in apparent radial velocity to enable adjustments to actual stellar radial motion. We also examined the center-to-limb temporal variability. Recovery of spatially resolved line profiles with fitted widths and depths is shown for various noise levels. Signals during exoplanet transit are simulated. In addition to Rossiter-McLaughlin type signatures in apparent radial velocity, analogous effects are shown for line depths and widths. From exoplanet transits, overall stellar line parameters of width, depth and wavelength position can be retrieved already with moderate efforts, but a very good signal-to-noise ratio is required to reveal the more subtle signatures between subgroups of spectral lines, where finer details of atmospheric structure are encoded. In a solar model, temporal variability shows correlations between jittering in apparent radial velocity and fluctuations in line depth. Since both fluctuations in line depth and jittering in wavelength can be measured from the ground, searches for low-mass exoplanets should explore these to adjust apparent radial velocities to actual stellar motion.
description: 13 pages, 7 figures, accepted for publication in Astronomy & Astrophysics
The Role of Storage in Commodity Markets: Indirect Inference Based on Grains Data
Creators: name: Gouel, Christophe
name: Legrand, Nicolas
name: Gouel, Christophe
name: Legrand, Nicolas
Publisher: name: Unknown
Year: 2021
Subjects: subject: Research Methods/ Statistical Methods
subject: commodity price dynamics
subject: indirect inference
subject: Monte Carlo analysis
subject: storage

description: This paper develops and estimates a rational expectations storage model with rich dynamic features. The model incorporates elastic supply, long-run demand and cost trends, and four structural shocks. It is estimated by indirect inference using a linear supply and demand model as an auxiliary model. This approach deviates from the common practice of estimating storage models only on prices and allows all parameters to be estimated. The estimation is carried out on a market representing the caloric aggregate of four basic staples: maize, rice, soybean, and wheat. The results show that our extended storage model is consistent with most of the moments in the data, including the high price autocorrelation which is the subject of longstanding debate. However, it fails to replicate the strength of the negative correlation between consumption and price.
Pomeranchuk instability in doped graphene
Creators: name: Valenzuela, Belen
name: Vozmediano, Maria A. H
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The density of states of graphene has Van Hove singularities that can be reached by chemical doping and have already been explored in photoemission experiments. We show that in the presence of Coulomb interactions the system at the Van Hove filling is likely to undergo a Pomeranchuk instability breaking the lattice point group symmetry. In the presence of an on--site Hubbard interaction the system is also unstable towards ferromagnetism. We explore the competition of the two instabilities and build the phase diagram. We also suggest that, for doping levels where the trigonal warping is noticeable, the Fermi liquid state in graphene can be stable up to zero temperature avoiding the Kohn--Luttinger mechanism and providing an example of two dimensional Fermi liquid at zero temperature.
description: 7 pages, 5 figures
The Galactic potential and dark matter density from angular stellar accelerations
Creators: name: Buschmann, Malte
name: Safdi, Benjamin R.
name: Schutz, Katelin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present an approach to measure the Milky Way (MW) potential using the angular accelerations of stars in aggregate as measured by astrometric surveys like Gaia. Accelerations directly probe the gradient of the MW potential, as opposed to indirect methods using e.g. stellar velocities. We show that end-of-mission Gaia stellar acceleration data may be used to measure the potential of the MW disk at approximately 3$σ$ significance and, if recent measurements of the solar acceleration are included, the local dark matter density at ~2$σ$ significance. Since the significance of detection scales steeply as $t^{5/2}$ for observing time $t$, future surveys that include angular accelerations in the astrometric solutions may be combined with Gaia to precisely measure the local dark matter density and shape of the density profile.
description: 7+8 pages, 2+5 figures
Additional file 1 of The message of oldhamites from enstatite chondrites
Creators: name: Hammouda, Tahar
name: Boyet, Maud
name: Frossard, Paul
name: Cartier, Camille
Publisher: name: figshare
Year: 2022
Subjects: subject: Molecular Biology
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Developmental Biology
subject: Plant Biology

description: Additional file 1. Major element concentrations analyzed in oldhamites by electron microprobe, together with detection limits.
Full-Scale Simulation and Experimentation Platforms for PV-Diesel Microgrid Control and Design: From Design to Stability Studies
Creators: name: Do, T.-P.
name: Le Pivert, X.
name: Bourry, F.
name: Colas, J.
Publisher: name: WIP
Year: 2019
Subjects: PV Systems and Storage – Modelling, Design, Operation and Performance
Design and Installation of PV Systems

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 1342-1345
description: Thanks to continuous decreasing costs of photovoltaic (PV) panels and storage solutions, PVdiesel microgrid becomes a choice adopted by more and more in industrial and community energy systems, especially in area with weak or no access to power grid. PV production being an intermittent source, technical solutions have been developed in order to obtain stability guarantee and economical gain during microgrid system life-time. Simulation and test platforms developed within INES together with PV system expert partners such as Capvert Energie address PV-Diesel system design and operation in a whole. Systems simulations are considered by 3 modules: Energy Module, Economic Module and Stability Module. Energy Module considers a time horizon from daily up to project life-time (20 or 30 years) for energy management aspect. Results will be used as inputs of Economic Module which compute global technical and economic indicators such as energy production cost and also project financial evaluation indicators. Stability Module considers dynamic simulation addressing analysis of system operation in transient mode, related to very short-term events such as load or consummation variation, short-circuit faults or islanding. At last, an experimental platform Hardwares In the Loop (HIL) allows to validate solutions developed from simulations. In this paper, simulation and experimentation platforms will be presented through an illustration study case of PV-Diesel microgrid design.
Enhanced Material Quality in SMART Mono-Si Block Cast Ingots by Introduction of Functional Defects
Creators: name: Riepe, S.
name: Krenckel, P.
name: Hayama, Y.
name: Hess, A.
name: Trötschler, T.
name: Kutsukake, K.
name: Maus, S.
name: Schindler, F.
name: Usami, N.
Publisher: name: WIP
Year: 2019
Subjects: Silicon Materials and Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 120-125
description: The use of cast-mono technology to control the development of structural defects during the block casting process enables the crystallization of Silicon for solar cells with good material quality at high throughput and low cost. The obstacles, ingrowth of parasitic grains and development of dislocation clusters, might be overcome by the SMART seeding technique, i.e. the introduction of functional defects. Ingots with the cast-mono and SMART seeding configuration, as well as a new approach including a monocrystalline spacer have been crystallized. Whereas the ingrowth of parasitic grains was reproduced with the standard cast-mono technique, the functional defects suppressed the ingrowth of parasitic grains until an ingot height of approx. 80 mm. By the introduction of an additional monocrystalline spacer, the ingrowth of parasitic grains could be avoided for the whole ingot height of 210 mm. The spreading of dislocation clusters in the monocrystalline area could be reduced significantly using the SMART approach in contrast to the standard cast-mono configuration. This reduction of structural defects enabled high bulk lifetimes above 1 ms on large wafer areas for both p- and n-type material after typical high efficiency solar cell processing steps.
Perovskite Meta-Stability Effects in Hysteresis-Free Measurements
Creators: name: Mihaylov, B.
name: Duck, B.C.
name: Anderson, K.F.
name: Jones, T.W.
name: Wang, J.
name: Duffy, N.W.
name: Fell, C.J.
name: Wilson, G.J.
Publisher: name: WIP
Year: 2019
Subjects: Perovskites, other Non-Silicon-Based Photovoltaics and Multi-Junction Devices
Perovskite Based Photovoltaics

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 618-622
description: Ionic species mobility coupled with multiple intrinsic and extrinsic degradation mechanisms are making universal, practical, reproducible and representative measurements of perovskite solar cells (PSC) challenging, yet these are required for device benchmarking and commercialisation. The observed I-V hysteresis in PSC devices has gained a lot of focus in recent years. Hysteresis can be reduced via advanced measurement techniques, however hysteresis-free measurements alone are not necessarily reproducible. This can be attributed to meta-stability in the devices at longer timescales. A simple cyclic test is proposed as a method for assessing the need for, and impact of, pre-conditioning procedures. For a benchmark PSC device with significant prior measurement and exposure history, the test suggests that up to 40 minutes of light bias near VMPP is required to achieve a quasi-stable state.
Fluctuations in the Site Disordered Traveling Salesman Problem
Creators: name: Dean, David S.
name: Lancaster, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We extend a previous statistical mechanical treatment of the traveling salesman problem by defining a discrete "site disordered'' problem in which fluctuations about saddle points can be computed. The results clarify the basis of our original treatment, and illuminate but do not resolve the difficulties of taking the zero temperature limit to obtain minimal path lengths.
description: 17 pages, 3 eps figures, revtex
Statistical EL-Image Evaluation for Describing the Degradation of PV-Modules after a Hailstorm
Creators: name: Buerhop-Lutz, C.
name: Pickel, T.
name: Winkler, T.
name: Hauch, J.
Publisher: name: WIP
Year: 2019
Subjects: Photovoltaic Modules and BoS Components
PV Module Design, Manufacture, Performance and Reliability

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 1134-1137
description: El-images are used to visualize defects in solar modules. Quantitative and comparable figures to address and identify defective cells are not extracted from the images so far. We used a statistical approach to get three key figures from the images: defective status, power-relevant area, and cell degradation. For analysis several EL-images of the same module were necessary. To study the impact of wind loads on the crack structures, the modules were exposed to 23,300 mechanical loading cycles, mimicking wind loads up to 40 m/s. The evolution of the crack structures was studied based on the ELimages that were recorded occasionally. The image evaluation reveals that defective, power-reducing cells and nondefective cells can be distinguished. Cell changes could be identified. The impact on the module power was within the measurement accuracy.