cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Performance of New Photovoltaic System Designs IEA PVPS Task 13 Subtask 1.3
Creators: name: Littwin, M.
name: Baumgartner, F.P.
name: Biba, C.
name: French, R.H.
name: Gfeller, D.
name: Green, M.
name: Messner, C.
name: Muntwyler, U.
name: Riley, D.
name: Rivola, D.
name: Schott, T.
name: Stein, J.S.
name: Trommsdorff, M.
name: Van Sark, W.G.J.H.M.
name: Köntges, M.
name: Ohrdes, T.
name: Brendel, R.
Publisher: name: WIP
Year: 2020
Subjects: PV Systems and Storage – Modelling, Design, Operation and Performance
Operation, Performance and Maintenance of PV Systems

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1208-1220
description: In the IEA PVPS Task 13 subtask 1.3 we put together a compendium of new performance characterization methods for new Photovoltaic (PV) system designs as a reference. New methods are described and explained by laboratory tests up to case studies. While performance characterization is more than evaluating efficiency of a component or a system in certain operating points, the results account for multi-dimensional usage and benefits. The performance aspects of new PV designs start with the resource-efficient construction of solar cells and all other PV system components, continue with efficient power generation, and end with the resources (including the land or water surfaces on which systems are built) needed to operate a complex PV system and multiple uses to replace otherwise non-energy generating components. These assessments are intended to provide well-founded and comparable key figures in order to enable new PV system designs to move faster into new fields of application.
Augmented Reality Supporting the Planning Processes in PV Plants
Creators: name: Baumgartner, F.P.
name: Carigiet, F.
name: Staiger, P.
name: Bachmann, B.
name: Gundelsweiler, F.
Publisher: name: WIP
Year: 2020
Subjects: PV Systems and Storage – Modelling, Design, Operation and Performance
Design and Installation of PV Systems

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1221-1223
description: For small PV installations on single family houses in Switzerland, the costs for planning and administrative work is about the same than the PV module costs leading to new challenges for optimizing these relevant sector of BOS Balance of System costs. The HoloLens 2, an augmented reality (AR) device, was used to measure the geometry of the roofs followed by a design approach of arranging virtually the PV modules on the roof in a semi-automated and interactive approach. Typical measurement uncertainties of two centimetre were reached at distances of about 10 meters. The planner on the roof can choose between different PV module products and mounting components for example, for South or East/West configuration. The automatic module arrangement is based on the selected degree of shading losses from the HoloLens2 menu, which takes the measured shading obstacles and railing on the roof into account and thus the available area to place the PV module is limited. Finally, an offer is produced by the HoloLens 2 to be handed over to the customer a few minutes after performing the measurement. The next steps to further develop the tool is to integrate an ordering process of the bill of materials of the PV plant to save time and costs for the planner. Other administrative tasks and forms which must be fully filed to get the permission to build the PV plant need to be automated. Finally, the plant approval qualification test will also be supported using AR as a relevant goal for the next development steps in the project.
The Impact of Tracker Structure on Bifacial PV Performance
Creators: name: Gross, F.
name: Luengo, M.R.
name: Hennings, L.
name: Landman, W.
name: Balz, M.
Publisher: name: WIP
Year: 2020
Subjects: Photovoltaic Modules and BoS Components
Inverters and Balance of System Components

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1199-1203
description: This study discusses the interplay of single-axis 2P photovoltaic tracker’s structure, optical yield, electrical performance and investment cost. The torque tube and the purlin/strut support structure both shade and reflect depending on the gap size and geometry chosen above the torque tube. The design affects the investment cost due to different steel tonnage and the operation. A small gap appears favorable.
Need for Legal Compliance for Safe Solar Energy Waste Disposal
Creators: name: Malaviya, J.N.
Publisher: name: WIP
Year: 2020
Subjects: Photovoltaic Modules and BoS Components
Sustainability and Recycling

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1204-1207
description: India is amongst the top five countries producing solar photovoltaic (PV) power and will continue to further improve its position in future. The government has already set sights to produce 350 GW of solar power. Until June 2020 the country has already achieved close to 35 GW. Owing to sub-standard quality of components being used at several places the country is likely to witness faster rate of early loss of PV modules. It is anticipated by the year 2030 close to 300,000 tons and by the year 2050 nearly 7,500,000 tons of solar waste will pile up. Presently there are no laws that mandate safe disposal of solar energy waste unlike WEEE in Europe and it needs to be accorded priority to ensure no landfilling. A not-for-profit organisation can formulate a roadmap to pave way for safe end of life management using low-cost recycling equipment and ensure they are used for RE-POWERING. Nee employment opportunities will be created. About 240,000 MW of new panels can be re-produced without extracting new materials. It will result in overall CO2 abatement of 360 billion tons in their lifetime.
Decentralized Harmonization Algorithm and Application to Functional Network Connectivity
Creators: name: Biozid, Bostami
Publisher: name: Georgia State University
Year: 2022

description:
Neuroimage data collected from multiple research institutions may incur additional source dependency, affecting the overall statistical power and leading to erroneous conclusions. This problem can be mitigated with data harmonization approaches. While open neuroimaging datasets are becoming more common, a substantial amount of data can still not be shared for various reasons. In addition, current approaches require moving all the data to a central location, which requires additional resources and creates redundant copies of the same datasets. To address these issues, we propose a decentralized harmonization approach called "Decentralized ComBat" that performs remote operations on the datasets separately without sharing individual subject data, ensuring a certain level of privacy and reducing regulatory hurdles. The study was conducted on harmonizing functional connectivity. Results showed similar performance as the centralized ComBat algorithm in a decentralized environment.
Semantic Structure based Query Graph Prediction for Question Answering over Knowledge Graph
Creators: name: Mingchen, Li
Publisher: name: Georgia State University
Year: 2022

description:
Building query graphs from questions is an important step in complex question answering over knowledge graph (Complex KGQA). In general, a question can be correctly answered if its query graph is built correctly and the right answer is then retrieved by issuing the query graph against the KG. Therefore, this paper focuses on query graph generation from natural language questions. Existing approaches for query graph generation ignore the semantic structure of a question, resulting in a large number of noisy query graph candidates that undermine prediction accuracies. In this paper, we define six semantic structures from common questions in KGQA and develop a novel Structure-BERT to predict the semantic structure of a question, and then rank the remaining candidates with a BERT-based ranking model. Extensive experiments on two popular benchmarks MetaQA and WebQuestionsSP demonstrate the effectiveness of our method as compared to state-of-the-arts.
Thermal Impact of Grid Injection Limits on Inverter Operation
Creators: name: Despeghel, J.
name: Ravyts, S.
name: Driesen, J.
Publisher: name: WIP
Year: 2020
Subjects: Photovoltaic Modules and BoS Components
Inverters and Balance of System Components

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1195-1198
description: To cope with the increasing amounts of grid injection due to the distributed generation of residential PV systems, regulators are considering to impose curtailment by means of a grid injection limit. In this paper the thermal impact of curtailment, by means of a grid injection limit, on device temperature and system efficiency is investigated. An experimental setup is used to measure the temperature of the main power electronic components of the inverter as well as the inverter efficiency throughout the operation in non-MPP conditions. Under these conditions the power electronic components are found to operate at a lower temperature, indicating a positive effect on inverter lifetime. However, the inverter efficiency tends to decrease for lower grid injection limits.
An Analysis Of Haricot Bean Value Chain: The Case Of Boricha District, Sidama Zone, Snnpr, Ethiopia
Creators: name: Bokansa, Gebriel
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: In Borich district, haricot bean are important food and cash crops that play a crucial role in the district. The overall objective of this research was to analysis of haricot bean value chain: profiling, antecedents and consequences of household farm activities in Boricha district, with the specific objectives of to map the value chain of haricot bean in the study area and to assess the relationship between antecedents of value chain activities of household farmers with the supply volume for market. The data were generated by individual interview by using questionnaires and checklists. This was supplemented by secondary data collected from different published and unpublished sources. Multistage sampling technique was applied. Sample of 180 haricot bean producers, Haricot bean traders also (15 local collectors or assemblers, 17 wholesalers, 10 retailers and 4 exporters) were sampled and interviewed along the chain. Descriptive statistics, value chain analysis and multiple regression analysis were employed. The main findings indicated that like variables age, family size, education, land size, haricot bean farming experience, access to extension service, and membership to any cooperative, off-farm income and marketing costs of haricot bean) were found to be significantly affecting the supply of haricot bean to market at household. Of these explanatory variables, Age , education , Land size, membership to any cooperative, off-farm income and marketing costs were the strongest factors that determine haricot bean supply to market (p<0.001). To improve the output of haricot bean production and marketing; actors should apply value chain approaches. But bringing about a meaningful change in the production and utilization of haricot bean in the study areas requires a combined effort of all relevant stakeholders
Quantum correlation of light scattered by disordered media
Creators: name: Starshynov, Ilya
name: Bertolotti, Jacopo
name: Anders, Janet
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study theoretically how multiple scattering of light in a disordered medium can spontaneously generate quantum correlations. In particular we focus on the case where the input state is Gaussian and characterize the correlations between two arbitrary output modes. As there is not a single all-inclusive measure of correlation, we characterise the output correlations with three measures: intensity fluctuations, entanglement, and quantum discord. We found that, while a single mode coherent state input can not produce quantum correlations, any other Gaussian input will produce them in one form or another. This includes input states that are usually regarded as more classical than coherent ones, such as thermal states, which will produce a non zero quantum discord.
Die Liturgie feiert die Präsenz Gottes in der Welt und seine Einladung an den Menschen
Creators: name: Llopis, Juan
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 7 Nr. 2 (1971): Concilium: Internationale Zeitschrift für Theologie, Band 7, Heft 2
New Quasidilaton theory in Partially Constrained Vielbein Formalism
Creators: name: De Felice, Antonio
name: Gümrükçüoğlu, A. Emir
name: Heisenberg, Lavinia
name: Mukohyama, Shinji
name: Tanahashi, Norihiro
Publisher: name: arXiv
Year: 2016
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 this work we study the partially constrained vielbein formulation of the new quasidilaton theory of massive gravity which couples to both physical and fiducial metrics simultaneously via a composite effective metric. This formalism improves the new quasidilaton model since the Boulware-Deser ghost is removed fully non-linearly at all scales. This also yields crucial implications in the cosmological applications. We derive the governing cosmological background evolution and study the stability of the attractor solution.
description: 13 pages
Module-Level Power Electronics under Indoor Performance Tests
Creators: name: Allenspach, C.
name: Gonzalez De Echavarri Castro, V.
name: Richter, S.
name: Meier, C.
name: Carigiet, F.
name: Baumgartner, F.P.
Publisher: name: WIP
Year: 2020
Subjects: Photovoltaic Modules and BoS Components
Inverters and Balance of System Components

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1188-1194
description: In the last decade, very few papers with outdoor measurement test results were published, which demonstrated a benefit of module-level power electronics (MLPE) higher than the measurement uncertainty. Due to the expected small difference in efficiency between conventional string-inverter based and MLPE systems, indoor measurements are required to exclude natural variation of solar irradiance in outdoor tests. Therefore, indoor efficiency measurements were performed on MLPE. Afterwards, the indoor measured efficiency of the single PV module DC/DC power optimizers were multiplied with the DC/AC inverter measurements. The final system efficiency with the maximum average value resulted in 94.78 % and with the power weighted efficiency in 94.37 %. Accordingly, if mismatches are neglected, the analysed MLPE system is expected to yield approximately 2.82% less energy than a comparable stringinverter based system in unshaded conditions. However, in the case of shading, the tested system with heavy-shading orthogonal to the cell strings was estimated to yield approximately 3.5 % more energy on a clear-sky day in March in Winterthur, Switzerland. The performances determined in the tests are significantly lower than the efficiencies provided by the datasheet of the power optimizers (around -2.29 %). However, they are still presumed to provide significant additional yields for PV systems with medium- and heavy-shading conditions.
The Spiders of Reality: Life Under Covid
Creators: name: Rahmani, Shahsavar
name: Cheesman, Tom
name: Contributor, Anonymous
Publisher: name: The Open University
Year: 2022
Subjects: classificationCode: 440199
subject: Anthropology not elsewhere classified
classificationCode: 441013
subject: Sociology of migration, ethnicity and multiculturalism
classificationCode: 480704
subject: Migration, asylum and refugee law

description: This poem was written in September 2020 by an asylum-seeker from Iran living in Swansea about life under Covid. In September 2021 she recited it for Covid Chronicles. It is a poignant exploration of the existential shift in consciousness imposed on us by Covid, government and restrictions – the growing unconsciousness demanded of us about the daily deaths. The poem alludes to the fact that for many asylum-seekers, already living in a kind of limbo of isolation, confinement was especially hard -and all that was possible was to peer through the curtains woven by the spiders of reality. She also conveys beautifully the shifts in our daily embodied experiences wrought by physical and social distancing and how this generated the wearing of many different kinds of masks – physical and emotional – to hide our feelings and selves. The poem expresses the longing and desire for a return to friendship, warmth, kindness and sociability.

The poet preferred to remain anonymous, translations made by Shahsavar Rahmani with Tom Cheesman. Tom also created the digital poem.

-----
This material is part of the Covid Chronicles from the Margins project, funded by The Open University and The Hague. The project aims to highlight the impact of the pandemic on refugees, asylum seekers & undocumented migrants.

This item can be found on our website, here: https://cov19chronicles.com/gallery/art-work/the-spiders-of-reality-life-under-covid/
The optical-UV emissivity of quasars: dependence on black hole mass and radio loudness
Creators: name: Shankar, Francesco
name: Calderone, Giorgio
name: Knigge, Christian
name: Matthews, James
name: Buckland, Rachel
name: Hryniewicz, Krzysztof
name: Sivakoff, Gregory
name: Dai, Xinyu
name: Richardson, Kayleigh
name: Riley, Jack
name: Gray, James
name: La Franca, Fabio
name: Altamirano, Diego
name: Croston, Judith
name: Gandhi, Poshak
name: Hoenig, Sebastian F.
name: McHardy, Ian
name: Middleton, Matthew
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We analyzed a large sample of radio-loud and radio-quiet quasar spectra at redshift 1.0 < z < 1.2 to compare the inferred underlying quasar continuum slopes (after removal of the host galaxy contribution) with accretion disk models. The latter predict redder (decreasing) alpha_3000 continuum slopes (L_ν~ν^alpha at 3000Ang) with increasing black hole mass, bluer alpha_3000 with increasing luminosity at 3000Ang, and bluer alpha_3000 with increasing spin of the black hole, when all other parameters are held fixed. We find no clear evidence for any of these predictions in the data. In particular we find that: (i) alpha_3000 shows no significant dependence on black hole mass or luminosity. Dedicated Monte Carlo tests suggest that the substantial observational uncertainties in the black hole virial masses can effectively erase any intrinsic dependence of alpha_3000 on black hole mass, in line with some previous studies. (ii) The mean slope alpha_3000 of radio-loud sources, thought to be produced by rapidly spinning black holes, is comparable to, or even redder than, that of radio-quiet quasars. Indeed, although quasars appear to become more radio loud with decreasing luminosity, we still do not detect any significant dependence of alpha_3000 on radio loudness. The predicted mean alpha_3000 slopes tend to be bluer than in the data. Disk models with high inclinations and dust extinction tend to produce redder slopes closer to empirical estimates. Our mean alpha_3000 values are close to the ones independently inferred at z<0.5 suggesting weak evolution with redshift, at least for moderately luminous quasars.
description: 6 pages, 4 figures. ApJ Letters, in press
Exact two-body solutions and Quantum defect theory of two dimensional dipolar quantum gas
Creators: name: Jie, Jianwen
name: Qi, Ran
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: In this paper, we provide the two-body exact solutions of two dimensional (2D) Schrödinger equation with isotropic $\pm 1/r^3$ interactions. Analytic quantum defect theory are constructed base on these solutions and are applied to investigate the scattering properties as well as two-body bound states of ultracold polar molecules confined in a quasi-2D geometry. Interestingly, we find that for the attractive case, the scattering resonance happens simultaneously in all partial waves which has not been observed in other systems. The effect of this feature on the scattering phase shift across such resonances is also illustrated.
description: 7 pages, 4 figures
Adsorption from binary solutions on chemically bonded phases
Creators: name: Borówko, M.
name: Staszewski, T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We use density functional theory to investigate adsorption of liquid mixtures on solid surfaces modified with end-grafted chains. The chains are modelled as freely joined spheres. The fluid molecules are spherical. All spherical species interact via the Lennard-Jones (12-6) potential. The Lennard-Jones (9-3) potential describes interactions of solvent molecules with the substrate. We study the relative excess adsorption isotherms, the structure of surface layer and its composition. The impact of the following parameters on adsorption is discussed: the grafting density, the grafted chain length, interactions of solvent molecules with grafted chains and with the substrate, and the presence of active groups in grafted chains. The theoretical results are consistent with experimental observations.
description: 14 pages, 5 figures
Cutoff regulators in chiral nuclear effective field theory
Creators: name: Long, Bingwei
name: Mei, Ying
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Three-dimensional cutoff regulators are frequently employed in multi-nucleon calculations, but they violate chiral symmetry and Lorentz invariance. A cutoff regularization scheme is proposed to compensate systematically at subleading orders for these symmetry violations caused by regulator artifacts. This is especially helpful when a soft momentum cutoff has to be used for technical reasons. It is also shown that dimensional regularization can still be used for some Feynman (sub)diagrams while cutoff regulators are used for the rest.
description: 11 pages, published version
Cluster mass profile reconstruction with size and flux magnification on the HST STAGES survey
Creators: name: Duncan, Christopher A. J.
name: Heymans, Catherine
name: Heavens, Alan F.
name: Joachimi, Benjamin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the first measurement of individual cluster mass estimates using weak lensing size and flux magnification. Using data from the HST-STAGES survey of the A901/902 supercluster we detect the four known groups in the supercluster at high significance using magnification alone. We discuss the application of a fully Bayesian inference analysis, and investigate a broad range of potential systematics in the application of the method. We compare our results to a previous weak lensing shear analysis of the same field finding the recovered signal-to-noise of our magnification-only analysis to range from 45% to 110% of the signal-to-noise in the shear-only analysis. On a case-by-case basis we find consistent magnification and shear constraints on cluster virial radius, and finding that for the full sample, magnification constraints to be a factor $0.77 \pm 0.18$ lower than the shear measurements.
description: Accepted to MNRAS
Elevated Temperatures Affecting Efficiency, Overall Performance and Energy Yield of PV Microinverters
Creators: name: Krauter, S.
name: Bendfeld, J.
Publisher: name: WIP
Year: 2020
Subjects: Photovoltaic Modules and BoS Components
Inverters and Balance of System Components

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1179-1180
description: During comparative measurements of different PV microinverters, two yield issues came up that could not be explored via conventional efficiency measurements, but do have a significant impact on electrical energy yield: First category of issues are either sluggish or nervously acting maximum–power–point–tracking devices, which lead to reduced energy yields. The other category of issues is thermal: As a first explanation for observed reduced energy yields, it has been assumed that the conversion efficiency degrades at higher operating temperatures. This matter has been investigated in this article: A change in conversion efficiency could not be observed for elevated operation temperatures up to 50°C, despite high-precision and repeated measurements. But it was found that some inverters temporarily interrupted (or entirely stopped) operation after long periods of running at high temperatures. Also, a reduction in potential maximum power output has been detected for those inverters. Summarizing: With a high degree of certainty it can be stated that those reported yield losses have been caused by the temporary shutdowns and power limitations of the inverters.
Thermal Charm and Charmonium Production in Quark Gluon Plasma
Creators: name: Zhou, Kai
name: Chen, Zhengyu
name: Greiner, Carsten
name: Zhuang, Pengfei
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the effect of thermal charm production on charmonium regeneration in high energy nuclear collisions. By solving the kinetic equations for charm quark and charmonium distributions in Pb+Pb collisions, we calculate the global and differential nuclear modification factors $R_{AA}(N_{part})$ and $R{AA}(p_t)$ for $J/Ψ$s. Due to the thermal charm production in hot medium, the charmonium production source changes from the initially created charm quarks at SPS, RHIC and LHC to the thermally produced charm quarks at Future Circular Collider (FCC), and the $J/Ψ$ suppression ($R_{AA}<1$) observed so far will be replaced by a strong enhancement ($R_{AA}>1$) at FCC at low transverse momentum.
description: 6 pages, 3 figures
Hierarchical Optimal Sampling (HOS): a tool for managing and manipulating wide-field imaging datasets
Creators: name: De Luca, Chiara
name: Bernava, Irene
name: De Bonis, Giulia
name: Simula, Francesco
name: Resta, Francesco
name: Montagni, Elena
name: Mascaro, Anna Letizia Allegra
name: Pavone, Francesco Saverio
name: Paolucci, Pier Stanislao
Publisher: name: Zenodo
Year: 2022
Subjects: Wide-field Imaging, Spatial Resolution, Signal-to-Noise Ratio, Data Capability, Analysis Pipeline, Algorithm, Software Tool

description: Powerful recording techniques and increasing anatomical knowledge provided by atlases allow studying the brain at a new level with unprecedented spatial resolution as that achieved with wide-field calcium imaging data. One of the the main issues related to the increase of the spatial resolution is to find the optimal condition which allows to obtain an appropriate signal-to-noise ratio for each channel, relative to the phenomenon of interest. Hierarchical Optimal Sampling (HOS) provides a data-driven inhomogeneous gridding of the field of view with the optimal spatial resolution that preserves and emphasizes the majority of the information from the high number of native signal sources.
Multilevel Weighted Support Vector Machine for Classification on Healthcare Data with Missing Values
Creators: name: Razzaghi, Talayeh
name: Roderick, Oleg
name: Safro, Ilya
name: Marko, Nicholas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: This work is motivated by the needs of predictive analytics on healthcare data as represented by Electronic Medical Records. Such data is invariably problematic: noisy, with missing entries, with imbalance in classes of interests, leading to serious bias in predictive modeling. Since standard data mining methods often produce poor performance measures, we argue for development of specialized techniques of data-preprocessing and classification. In this paper, we propose a new method to simultaneously classify large datasets and reduce the effects of missing values. It is based on a multilevel framework of the cost-sensitive SVM and the expected maximization imputation method for missing values, which relies on iterated regression analyses. We compare classification results of multilevel SVM-based algorithms on public benchmark datasets with imbalanced classes and missing values as well as real data in health applications, and show that our multilevel SVM-based method produces fast, and more accurate and robust classification results.
description: arXiv admin note: substantial text overlap with arXiv:1503.06250
Optimal Design of Series-Parallel Differential Power Processing Converters for Photovoltaic Array Energy Systems
Creators: name: Etarhouni, M.
name: Chong, B.
name: Zhang, L.
Publisher: name: WIP
Year: 2020
Subjects: Photovoltaic Modules and BoS Components
Inverters and Balance of System Components

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1181-1187
description: A scheme is proposed for maximum power point tracking in series-parallel photovoltaic arrays using differential power processing, based on bidirectional Cuk converters and inverted buck converters for adjusting module current and voltage respectively. Converter transfer functions are derived using linearization and state space time averaging. These are used to develop design criteria for well-behaved transient response, and reduction of the effect of non-minimum phase. A representative design with about 10 ms settling is presented. It is shown that this can form the basis of a successful perturb-and-observe control system.
The Role Of Information Communication Technology Adoption On Supply Chain Performance Of The Ethiopian Shipping And Logistics Services Enterprises
Creators: name: Girma, Ermias
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019

description: Information and Communication Technology solutions in supply chain management have often been approached from various dimensions with a focus on the overall effect on efficiency, customer value and cost. Efficiency and reliability in the logistics industry through various modalities such as adoption of Information and Communication Technology solutions has seen improvements in customs management systems, security tracking and tracing shipments and information sharing. However, many sectors of the logistics industry still run on traditional or manual systems and this could be attributed to their ineffective and inefficient performance. There exists a research gap on this area of the role of Information and Communication Technology adoption on supply chain performance in Ethiopian Shipping and Logistics Services Enterprise. The study employed a descriptive research design. The population comprised of 335 employees in Ethiopian Shipping and Logistics Services Enterprise. The stratified sampling techniques was applied after the population divided in to the appropriate strata and a proportionate sampling was taken from each strata to represent all the strata .258 employees were found to appropriately match the population size of 335 and selected for this study from the shipping ,freight forwarding and port and terminal handling sectors including Information and Communication Technology department. Factor analysis was used to reduce the variable dimension and descriptive statistics was used to identify the challenges on the adoption of Information and Communication Technology on supply chain performance. Correlation and Regression analysis approaches were used to investigate the relationships between the variables and the extent to which the independent variables explained supply chain performance. Finding shows that lack of education and training were the major Information and Communication Technology adoption challenges and to alleviate the challenge a careful assessment of education and training needs should minimize this problem. Therefore Ethiopian Shipping and Logistics Services Enterprise need improve Information and Communication Technology adoption and Information and Communication Technology capability in order to improve on the supply chain performances operations especially in the areas of documentation, cargo tracking, warehousing, transportation, freight forwarding, port and terminal handling and shipment operations
Monte-Carlo study of the MRPC prototype for the upgrade of BESIII
Creators: name: An, F. F.
name: Sun, S. S.
name: Liu, H. M.
name: Li, W. G.
name: Deng, Z. Y.
name: Liu, H. H.
name: Liu, J. Y.
name: Yang, R. X.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A GEANT4-based simulation is developed for the endcap time of flight (ETOF) upgrade based on multi-gap resistive plate chambers (MRPC) for the BESIII experiment. The MRPC prototype and the simulation method are described. Using a full Monte-Carlo simulation, the influence of high voltage and threshold on time resolution and detection efficiency are investigated. The preliminary results from simulation are presented and are compared with the experimental data taken with the prototype MRPC modules.
description: 8 pages, 7 figures
Liturgie in einer Welt der Naturwissenschaften, der Technik und des Handels
Creators: name: Dippel, Cornelis Johannes
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 7 Nr. 2 (1971): Concilium: Internationale Zeitschrift für Theologie, Band 7, Heft 2
Is the Escape Velocity in Star Clusters Linked to Extended Star Formation Histories? Using NGC 7252: W3 as a Test Case
Creators: name: Cabrera-Ziri, I.
name: Bastian, N.
name: Hilker, M.
name: Davies, B.
name: Schweizer, F.
name: Kruijssen, J. M. D.
name: Mejía-Narváez, A.
name: Niederhofer, F.
name: Brandt, T. D.
name: Rejkuba, M.
name: Bruzual, G.
name: Magris, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The colour-magnitude diagrams of some intermediate-age clusters (1-2 Gyr) star clusters show unexpectedly broad main-sequence turnoffs, raising the possibility that these clusters have experienced more than one episode of star formation. Such a scenario predicts the existence of an extended main sequence turn off (eMSTO) only in clusters with escape velocities above a certain threshold ($>15$ km s$^{-1}$), which would allow them to retain or accrete gas that eventually would fuel a secondary extended star-formation episode. This paper presents a test of this scenario based on the study of the young and massive cluster NGC 7252: W3. We use the HST photometry from WFPC2 and WFC3 images obtained with UV and optical filters, as well as MagE echellette spectrograph data from the Las Campanas Clay 6.5m telescope, in order to construct the observed UV/optical SED of NGC 7252: W3. The observations are then compared with synthetic spectra based on different star formation histories consistent with those of the eMSTO clusters. We find that the SED of this cluster is best fitted by a synthetic spectrum with a single stellar population of age $570^{+70}_{-62}$ Myr and mass $1.13^{+0.14}_{-0.13}\times 10^8$ M$_\odot$, confirming earlier works on NGC 7252: W3. We also estimate the lower limit on the central escape velocity of 193 km s$^{-1}$. We rule out extended star-formation histories, like those inferred for the eMSTO clusters in the Magellanic Clouds, at high confidence. We conclude that the escape velocity of a cluster does not dictate whether a cluster can undergo extended periods of star formation.
description: 14 pages, 10 figures, accepted for publication in MNRAS
Indication of the High Mass-Transfer Ratio in S-type Symbiotic Binaries
Creators: name: Shagatova, Natalia
name: Skopal, Augustin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: By modelling H$^0$ column densities in eclipsing S-type symbiotic stars EG And and SY Mus, we derived the wind velocity profile and the corresponding mass-loss rate from their giants. Our analysis revealed a strong enhancement of the wind at the orbital plane.
description: proceedings of the conference "The Physics of Evolved Stars: a Conference Dedicated to the Memory of Olivier Chesneau", 2 pages, 2 figures
Study, Design and Implementation of a MPPT Based on FPGA Open Source
Creators: name: Sainz Estébanez, U.
name: Azkona, N.
Publisher: name: WIP
Year: 2020
Subjects: Photovoltaic Modules and BoS Components
Inverters and Balance of System Components

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 1171-1174
description: In the present work, the objective is to implement a MPPT algorithm without use of micro-controllers. To do this, it is decided to design a digital architecture, based on a state machine, which performs the algorithm mentioned making use of logic gates and Flip-Flops. These elements will be described in the hardware description language Verilog. The challenge of the project is to duly order these elements to form combinational logics, which perform, for example, multiplication operations; within of a sequential framework that executes cyclically each of the states.
Two-parameter scaling theory of the longitudinal magnetoconductivity in a Weyl metal phase: Chiral anomaly, weak disorder, and finite temperature
Creators: name: Kim, Kyoung-Min
name: Shin, Dongwoo
name: Sasaki, M.
name: Kim, Heon-Jung
name: Kim, Jeehoon
name: Kim, Ki-Seok
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It is at the heart of modern condensed matter physics to investigate the role of a topological structure in anomalous transport phenomena. In particular, chiral anomaly turns out to be the underlying mechanism for the negative longitudinal magnetoresistivity in a Weyl metal phase. Existence of a dissipationless current channel causes enhancement of electric currents along the direction of a pair of Weyl points or applied magnetic fields ($B$). However, temperature ($T$) dependence of the negative longitudinal magnetoresistivity has not been understood yet in the presence of disorder scattering since it is not clear at all how to introduce effects of disorder scattering into the "topological-in-origin" transport coefficient at finite temperatures. The calculation based on the Kubo formula of the current-current correlation function is simply not known for this anomalous transport coefficient. Combining the renormalization group analysis with the Boltzmann transport theory to encode the chiral anomaly, we reveal how disorder scattering renormalizes the distance between a pair of Weyl points and such a renormalization effect modifies the topological-in-origin transport coefficient at finite temperatures. As a result, we find breakdown of $B/T$ scaling, given by $B/T^{1 + η}$ with $0 < η< 1$. This breakdown may be regarded to be a fingerprint of the interplay between disorder scattering and topological structure in a Weyl metal phase.
Anisotropy of the magnetic properties of the FeTe0.65Se0.35 superconductor
Creators: name: Bondarenko, S. I.
name: Bludov, O. M.
name: Wisniewski, A.
name: Gawryluk, D.
name: Dudar, I. S.
name: Koverya, V. P.
name: Monarkha, V. Yu.
name: Sivakov, A. G.
name: Timofeev, V. P.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The magnetization anisotropy of a layered superconductor FeTe0.65Se0.35 sample is experimentally studied in a magnetic field directed either along the layers of the plane, or perpendicular to them. The value of the vortex pinning potential in a weak magnetic field, and the critical current density ratio are determined for these directions. The results are discussed within the framework of presenting the sample as layers of fine single crystals, divided by weak interlayer superconducting bonds with magnetic inclusions.
description: 4 pages, 6 figures
Intersectional design in practice a critical perspective on sustainability for all
Creators: name: Pollini, Alessandro
name: Caforio, Alessandro
name: Orero, Pilar
Publisher: name: Zenodo
Year: 2023
Subjects: Green Deal, GreenSCENT, Horizon2020, UX, Accessibility, Diversity, Inclusion

description: Presentation of the project Greenscent and its intersectionality approaches during the 8th International Forum of Design as a Process - Disrupting Geographies in the Design World. https://www.forumdesignprocess.org/dgdw22/wp-content/uploads/2022/06/DGDW22_Agenda.pdf
Computational studies on the behaviour of anionic and nonionic surfactants at the SiO$_{2}$ (silicon dioxide)/water interface
Creators: name: Núñez-Rojas, E.
name: Dominguez, H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Molecular dynamics simulations to study the behaviour of anionic (Sodium Dodecylsulfate, SDS) and nonionic (Monooleate of Sorbitan, SPAN80) surfactants close to a SiO$_{2}$ (silicon dioxide) surface were carried out. Simulations showed that a water layer was first adsorbed on the surface and then the surfactants were attached on that layer. Moreover, it was observed that water behaviour close to the surface influenced the surfactant adsorption since a semi-spherical micelle was formed on the SiO$_{2}$ surface with SDS molecules whereas a cylindrical micelle was formed with SPAN80 molecules. Adsorption of the micelles was conducted in terms of structural properties (density profiles and angular distributions) and dynamical behaviour (diffusion coefficients) of the systems. Finally, it was also shown that some water molecules moved inside the solid surface and located at specific sites of the solid surface.
description: 8 pages, 6 fiigures
Observation of coupling between zero- and two-dimensional semiconductor systems based on anomalous diamagnetic effects
Creators: name: Cao, Shuo
name: Tang, Jing
name: Sun, Yue
name: Peng, Kai
name: Gao, Yunan
name: Zhao, Yanhui
name: Qian, Chenjiang
name: Sun, Sibai
name: Ali, Hassan
name: Shao, Yuting
name: Wu, Shiyao
name: Song, Feilong
name: Williams, David A.
name: Sheng, Weidong
name: Jin, Kuijuan
name: Xu, Xiulai
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report the direct observation of coupling between a single self-assembled InAs quantum dot and a wetting layer, based on strong diamagnetic shifts of many-body exciton states using magneto-photoluminescence spectroscopy. An extremely large positive diamagnetic coefficient is observed when an electron in the wetting layer combines with a hole in the quantum dot; the coefficient is nearly one order of magnitude larger than that of the exciton states confined in the quantum dots. Recombination of electrons with holes in a quantum dot of the coupled system leads to an unusual negative diamagnetic effect, which is five times stronger than that in a pure quantum dot system. This effect can be attributed to the expansion of the wavefunction of remaining electrons in the wetting layer or the spread of electrons in the excited states of the quantum dot to the wetting layer after recombination. In this case, the wavefunction extent of the final states in the quantum dot plane is much larger than that of the initial states because of the absence of holes in the quantum dot to attract electrons. The properties of emitted photons that depend on the large electron wavefunction extents in the wetting layer indicate that the coupling occurs between systems of different dimensionality, which is also verified from the results obtained by applying a magnetic field in different configurations. This study paves a new way to observe hybrid states with zero- and two-dimensional structures, which could be useful for investigating the Kondo physics and implementing spin-based solid-state quantum information processing.
description: 20 pages, 7 figures in Nano Research, 2015
Long-term mutual phase locking of picosecond pulse pairs generated by a semiconductor nanowire laser
Creators: name: Mayer, B.
name: Regler, A.
name: Sterzl, S.
name: Stettner, T.
name: Koblmüller, G.
name: Kaniber, M.
name: Lingnau, B.
name: Lüdge, K.
name: Finley, J. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The ability to generate phase-stabilised trains of ultrafast laser pulses by mode-locking underpins photonics research in fields such as precision metrology and spectroscopy. However, the complexity of conventional mode-locked laser systems, combined with the need for a mechanism to induce active or passive phase locking between resonator modes, has hindered their realisation at the nanoscale. Here, we demonstrate that GaAs-AlGaAs nanowire lasers are capable of emitting pairs of phase-locked picosecond laser pulses when subject to non-resonant pulsed optical excitation with a repetition frequency up to ~200GHz. By probing the two-pulse interference that emerges within the homogeneously broadened laser emission, we show that the optical phase is preserved over timescales extending beyond ~30ps, much longer than the emitted laser pulse duration (~2ps). Simulations performed by solving the optical Bloch equations produce good quantitative agreement with experiments, revealing how the phase information is stored in the gain medium close to transparency. Our results open the way to applications such as on-chip, ultra-sensitive Ramsey comb spectroscopy.
Leaf from a Medieval Gradual, Fragment
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Manuscripts, Medieval
valueUri: http://id.worldcat.org/fast/1008422
subject: Graduals (Chants)
valueUri: http://id.worldcat.org/fast/1761754

description: Leaf from a Medieval Gradual, France, ca. 1500.