cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Reappraisal of a model for deformed special relativity
Creators: name: Gubitosi, Giulia
name: Magueijo, Joao
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We revisit one of the earliest proposals for deformed dispersion relations in the light of recent results on dynamical dimensional reduction and production of cosmological fluctuations. Depending on the specification of the measure of integration and addition rule in momentum space the model may be completed so as to merely deform Lorentz invariance, or so as to introduce a preferred frame. Models which violate Lorentz invariance have a negative UV asymptotic dimension and a very red spectrum of quantum vacuum fluctuations. Instead, models which preserve frame independence can exhibit running to a UV dimension of 2, and a scale-invariant spectrum of fluctuations. The bispectrum of the fluctuations is another point of divergence between the two casings proposed here for the original model.
Verification of Power Loss Mechanisms Contributing to the Illuminated Lock-In Thermography (ILIT) Signal
Creators: name: Walter, B.
name: Kasemann, M.
name: Grote, D.
name: Ebser, J.
name: Kwapil, W.
name: Warta, W.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 310-314
description: Illuminated Lock–In Thermography (ILIT) is a versatile tool for spatially resolved detection of power losses in silicon solar cells close to real operation conditions. In this paper, quantitative analysis of different power loss mechanisms contributing to the ILIT-signal will be presented by means of ILIT-measurements. First, the appearance of heat due to energy losses of free carriers after photon absorption and energy losses of carriers crossing the p-n-junction will be verified in ILIT-measurements. Further, two different methods of quantifying ohmic type shunts with ILIT-measurements will be compared. It will be shown, that it is possible to determine a reliable global value for the parallel resistance with ILIT under certain assumptions. At last, an assumption used for the determination of shunt resistances with ILIT is checked.
Simulation of the isotropic ultra-high energy photons flux in the solar magnetic field and a comparison with observations made by the HAWC and Fermi-LAT observatories
Creators: name: Alvarez-Castillo, David
name: Homola, Piotr
name: Poncyljusz, Bożena
name: Gora, Dariusz
name: Dhital, Niraj
name: Sushchov, Oleksandr
name: Stasielak, Jarosław
name: Stuglik, Sławomir
name: Nazari, Vahab
name: Oancea, Cristina
name: Beznosko, Dmitriy
name: Zabari, Noemi
name: Gupta, Alok C.
name: Hnatyk, Bohdan
name: Mozgova, Alona
name: Kasztelan, Marcin
name: Bielewicz, Marcin
name: Kovacs, Peter
name: Łozowski, Bartosz
name: Medvedev, Mikhail V.
name: Miszczyk, Justyna
name: Bibrzycki, Łukasz
name: Niedźwiecki, Michał
name: Smelcerz, Katarzyna
name: Hachaj, Tomasz
name: Piekarczyk, Marcin
name: Pawlik, Maciej
name: Rzecki, Krzysztof
name: Rosas, Matías
name: Smolek, Karel
name: Svanidze, Manana
name: Beradze, Revaz
name: Tursunov, Arman
name: Wibig, Tadeusz
name: Zamora-Saa, Jilberto
name: Mędrala, Justyna
name: Opiła, Gabriela
name: Pryga, Jerzy
name: Ruimi, Ophir
name: Cahuantzi, Mario Rodriguez
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In this contribution we study the possibility of the formation of cosmic ray ensembles (CRE) created by the interaction of ultra-high energy (UHE) photons with the magnetic field of the Sun. The lack of observation of those UHE and the difficulties for their identification given the current methodologies motivates this study. We performed simulations using the PRESHOWER program in order to simulate the expected extensive air showers which might be spatially correlated generated upon entering the Earth's atmosphere. We found characteristic features like very thing and extremely elongates cascades of secondary photons with their corresponding energies spanning the entire cosmic range spectrum. Shower footprints are as large as hundreds of kilometres. An application of this study is the scenario of gamma-ray emission from the vicinity of the Sun as a result of ultra-high energy photon cascading in the solar magnetic field in order to understand recent observations made by the HAWC and Fermi-LAT observatories.
description: 8 pages, 4 figures, 38th International Cosmic Ray Conference (ICRC2023) 26 July - 3 August, 2023 Nagoya, Japan
Suplementary for Utilizing MinION Nanopore Oxford Technology for Long-read Sequencing from Genomic DNA of Parashorea lucida
Creators: name: Tauhida, Nita
Publisher: name: figshare
Year: 2022
Subjects: subject: 60102 Bioinformatics
subject: FOS: Computer and information sciences
subject: Biotechnology
subject: Botany
subject: Molecular Biology
subject: Plant Biology
subject: FOS: Biological sciences

description: Report statistics of corrected contig assembly
Photovoltaic Properties of Coupled Quantum Well Structures: Microscopic Theory and Numerical Simulation
Creators: name: Aeberhard, U.
name: Morf, R.H.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 320-322
description: We use our recently developed microscopic approach to a quantum theory of the photovoltaic processes in nanostructures to investigate geometry effects in quantum well photovoltaics, focusing on the role of asymmetry and interwell
coupling in double quantum well (DQW) systems. For that purpose, the IV
and power characteristics for DQW systems with different asymmetry and degree of coupling are determined numerically in the vicinity of the maximum power point. In order to assess the transport properties of a specific QW structure, we isolate these from the effects of absorption by normalizing to the absorptivity. The results obtained from this procedure reveal the escape regime dominating at room temperature and are in agreement with previous experimental observations.
Developing an online hate classifier for multiple social media platforms
Creators: name: Salminen, Joni
name: Hopf, Maximilian
name: Chowdhury, Shammur A.
name: Jung, Soon-gyo
name: Almerekhi, Hind
name: Jansen, Bernard J.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Human-centred computing

description: The proliferation of social media enables people to express their opinions widely online. However, at the same time, this has resulted in the emergence of conflict and hate, making online environments uninviting for users. Although researchers have found that hate is a problem across multiple platforms, there is a lack of models for online hate detection using multi-platform data. To address this research gap, we collect a total of 197,566 comments from four platforms: YouTube, Reddit, Wikipedia, and Twitter, with 80% of the comments labeled as non-hateful and the remaining 20% labeled as hateful. We then experiment with several classification algorithms (Logistic Regression, Naïve Bayes, Support Vector Machines, XGBoost, and Neural Networks) and feature representations (Bag-of-Words, TF-IDF, Word2Vec, BERT, and their combination). While all the models significantly outperform the keyword-based baseline classifier, XGBoost using all features performs the best (F1 = 0.92). Feature importance analysis indicates that BERT features are the most impactful for the predictions. Findings support the generalizability of the best model, as the platform-specific results from Twitter and Wikipedia are comparable to their respective source papers. We make our code publicly available for application in real software systems as well as for further development by online hate researchers.Other Information Published in: Human-centric Computing and Information Sciences
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1186/s13673-019-0205-6
Many-body electron correlations in graphene
Creators: name: Neilson, David
name: Perali, Andrea
name: Zarenia, Mohammad
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The conduction electrons in graphene promise new opportunities to access the region of strong many-body electron-electron correlations. Extremely high quality, atomically flat two-dimensional electron sheets and quasi-one-dimensional electron nanoribbons with tuneable band gaps that can be switched on by gates, should exhibit new many-body phenomena that have long been predicted for the regions of phase space where the average Coulomb repulsions between electrons dominate over their Fermi energies. In electron nanoribbons a few nanometres wide etched in monolayers of graphene, the quantum size effects and the van Hove singularities in their density of states further act to enhance electron correlations. For graphene multilayers or nanoribbons in a double unit electron-hole geometry, it is possible for the many-body electron-hole correlations to be made strong enough to stabilise high-temperature electron-hole superfluidity.
description: 8 pages, 6 figures, Conference Proceedings MBT-18, Niagara Falls, 2015
Ordered $S_{p}$-metric spaces and some fixed point theorems for contractive mappings with application to periodic boundary value problems
Creators: name: Mustafa, Z.
name: Shahkoohi, R. J.
name: Parvaneh, V.
name: Kadelburg, Z.
name: Jaradat, M. M. M.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Applied mathematics

description: In this paper, we introduce the structure of $S_{p}$ S p -metric spaces as a generalization of both S-metric and $S_{b}$ S b -metric spaces. Also, we present the notions of S̃-contractive mappings in the setup of ordered $S_{p}$ S p -metric spaces and investigate the existence of a fixed point for such mappings under various contractive conditions. We provide examples to illustrate the results presented herein. An application to periodic boundary value problems is presented.Other Information Published in: Fixed Point Theory and Applications
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1186/s13663-019-0666-3
Nepal’s Sacred Cattle: Profitability Analysis and Policy Implications
Creators: name: Ojo, Kehinde Elizabeth
name: VanSickle, John J.
name: Thapa, Bhawna
name: Ojo, Kehinde Elizabeth
name: VanSickle, John J.
name: Thapa, Bhawna
Publisher: name: Unknown
Year: 2022
Subjects: subject: Livestock Production/Industries
subject: Production Economics
subject: Nepal’s sacred cattle
subject: no-slaughtering of cattle policy
subject: profitability analysis

description: This paper analyzes Nepal’s current livestock policy, which is rooted in culture and religion, and the extent to which its design has not kept pace with the continuing transformation of the country’s agricultural landscape. It estimates the impact of the no-slaughtering of cattle policy on dairy producers using Latin hypercube simulations to quantify a baseline and alternative scenario for cattle milk production. The baseline models the current production system, while the alternative scenario models milk production where producers are allowed to slaughter or export cattle. Results indicate that farmers’ profit per liter of milk increases by 19 to 31 percent in the alternative scenario.
Detailed Modelling of Silicon Solar Cells
Creators: name: Cuevas, A.
name: Sinton, R.A.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 315-319
description: Modelling solar cells using analytical expressions provides insight into the different physical mechanisms that dictate their operation. Purely analytical models are, nevertheless, only applicable to a restricted range of material properties and operation conditions. In particular, they assume low injection conditions and constant recombination (carrier lifetimes) and transport (carrier mobilities) parameters. The reality of silicon solar cells is that these simplifying assumptions frequently do not apply. For example, iron contamination produces a strong variability of the carrier lifetime between short-circuit and open-circuit conditions. A model that is applicable more generally requires some level of computer-aided numerical solution. The approach followed here is to maintain a high degree of analytical transparency and to reduce numerical computation to a minimum. This paper presents a comprehensive model capable of determining the excess carrier density profile for arbitrary recombination rates, photon absorption, illumination intensity and temperature. The model can be used to calculate the main output parameters of a solar cell: Jsc, Voc, maximum power point and plot the photovoltaic I-V characteristic curve.
On questions which are connected with Talagrand problem
Creators: name: Mykhaylyuk, V. V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics

description: We prove the following results. 1. If $X$ is a $α$-favourable space, $Y$ is a regular space, in which every separable closed set is compact, and $f:X\times Y\to\mathbb R$ is a separately continuous everywhere jointly discontinuous function, then there exists a subspace $Y_0\subseteq Y$ which is homeomorphic to $β\mathbb N$. 2. There exist a $α$-favourable space $X$, a dense in $β\mathbb N\setminus\mathbb N$ countably compact space $Y$ and a separately continuous everywhere jointly discontinuous function $f:X\times Y\to\mathbb R$. Besides, it was obtained some conditions equivalent to the fact that the space $C_p(β\mathbb N\setminus\mathbb N,\{0,1\})$ of all continuous functions $x:β\mathbb N\setminus\mathbb N\to\{0,1\}$ with the topology of point-wise convergence is a Baire space.
Hermite–Hadamard-type inequalities for interval-valued preinvex functions via Riemann–Liouville fractional integrals
Creators: name: Sharma, Nidhi
name: Singh, Sanjeev Kumar
name: Mishra, Shashi Kant
name: Hamdi, Abdelouahed
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Applied mathematics
Pure mathematics

description: In this paper, we introduce $(h_{1},h_{2})$ ( h 1 , h 2 ) -preinvex interval-valued function and establish the Hermite–Hadamard inequality for preinvex interval-valued functions by using interval-valued Riemann–Liouville fractional integrals. We obtain Hermite–Hadamard-type inequalities for the product of two interval-valued functions. Further, some examples are given to confirm our theoretical results.Other Information Published in: Journal of Inequalities and Applications
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1186/s13660-021-02623-w
SLIQ: Quantum Image Similarity Networks on Noisy Quantum Computers
Creators: name: Silver, Daniel
name: Patel, Tirthak
name: Ranjan, Aditya
name: Gandhi, Harshitta
name: Cutler, William
name: Tiwari, Devesh
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Exploration into quantum machine learning has grown tremendously in recent years due to the ability of quantum computers to speed up classical programs. However, these efforts have yet to solve unsupervised similarity detection tasks due to the challenge of porting them to run on quantum computers. To overcome this challenge, we propose SLIQ, the first open-sourced work for resource-efficient quantum similarity detection networks, built with practical and effective quantum learning and variance-reducing algorithms.
Secondary Photocurrent - Current Generated From Secondary Emitted Photons
Creators: name: Vanek, J.
name: Jandova, K.
name: Kazelle, J.
name: Barinka, R.
name: Poruba, A.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 323-325
description: This work presents a detailed analysis of the LBIC images with visible back side contact. The LBIC measurement for a solar cell local characterization has been developed and tested on mono-crystalline silicon solar cells. The solar cells were locally illuminated by a focused light source of different wavelengths. The response (current or potential) of the solar cell was measured at stationary conditions during the scanning process. A large number of independent data with high spatial resolution were obtained. Applying an advanced fitting procedure on these data yields a set of local parameters for each point on the solar cell, giving information on the distribution of the photo current, series, shunt resistance and lateral diffusion of minority carriers. The theoretical approach to this technique will be discussed and the applicability of this characterization tool will be demonstrated and compared. We have studied a group of silicon solar cells with good and wrong standard parameters. In this part we describe our study of the comparison between LBIC images with different wavelengths of the light source and explain the projection of back side contact of LBIC image by the theory of secondary emission of infrared light.
Perceived stress, stressors, and coping strategies among nursing students in the Middle East and North Africa: an overview of systematic reviews
Creators: name: Chaabane, Sonia
name: Chaabna, Karima
name: Bhagat, Sapna
name: Abraham, Amit
name: Doraiswamy, Sathyanarayanan
name: Mamtani, Ravinder
name: Cheema, Sohaila
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Clinical sciences

description: Background In nursing students, high stress levels can lead to burnout, anxiety, and depression. Our objective is to characterize the epidemiology of perceived stress, stressors, and coping strategies among nursing students in the Middle East and North Africa region. Methods We conducted an overview of systematic reviews. We systematically searched PubMed, Embase, PsycInfo, and grey literature sources between January 2008 and June 2020 with no language restrictions. We included any systematic review reporting measurable stress-related outcomes including stress prevalence, stressors, and stress coping strategies in nursing students residing in any of the 20 Middle East and North Africa countries. We also included additional primary studies identified through a hand search of the reference lists of relevant primary studies and systematic reviews. Results Seven systematic reviews and 42 primary studies with data from Bahrain, Egypt, Iraq, Jordan, Oman, Pakistan, Palestine, Saudi Arabia, and Sudan were identified. Most studies included nursing students undergoing clinical training. The prevalence range of low, moderate, and high perceived stress among nursing students was 0.8–65%, 5.9–84.5%, and 6.7–99.2%, respectively. Differences related to gender, training period, or the type of tool used to measure stress remain unclear given the wide variability in the reported prevalence measures across all stress levels. Common clinical training stressors were assignments, workload, and patient care. Academic training-related stressors included lack of break/leisure time, low grades, exams, and course load. Nursing students utilized problem focused (dealing with the problem), emotion focused (regulating the emotion), and dysfunctional (venting the emotions) stress coping mechanisms to alleviate their stress. Conclusions Available data does not allow the exploration of links between stress levels, stressors, and coping strategies. Limited country-specific prevalence data prevents comparability between countries. Reducing the number or intensity of stressors through curriculum revision and improving students’ coping response could contribute to the reduction of stress levels among students. Mentorship, counseling, and an environment conducive to clinical training are essential to minimize perceived stress, enhance learning, and productivity, and prevent burnout among nursing students.Other Information Published in: Systematic Reviews
 License: http://creativecommons.org/licenses/by/4.0/
See article on publisher's website: http://dx.doi.org/10.1186/s13643-021-01691-9
Stellar Coronal Response to Differential Rotation and Flux Emergence
Creators: name: Gibb, G. P. S.
name: Mackay, D. H.
name: Jardine, M. M.
name: Yeates, A. R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We perform a numerical parameter study to determine what effect varying differential rotation and flux emergence has on a star's non-potential coronal magnetic field. In particular we consider the effects on the star's surface magnetic flux, open magnetic flux, mean azimuthal field strength, coronal free magnetic energy, coronal heating and flux rope eruptions. To do this, we apply a magnetic flux transport model to describe the photospheric evolution, and couple this to the non-potential coronal evolution using a magnetofrictional technique. A flux emergence model is applied to add new magnetic flux onto the photosphere and into the corona. The parameters of this flux emergence model are derived from the solar flux emergence profile, however the rate of emergence can be increased to represent higher flux emergence rates than the Sun's. Overall we find that flux emergence has a greater effect on the non-potential coronal properties compared to differential rotation, with all the aforementioned properties increasing with increasing flux emergence rate. Although differential rotation has a lesser effect on the overall coronal properties compared to flux emergence, varying differential rotation does alter the coronal structure. As the differential rotation rate increases, the corona becomes more open, and more non-potential.
description: 15 pages, 18 figures
Luminescent Solar Concentrators: A Comparison of Thermodynamic Modelling and Ray-Trace Modelling Predictions
Creators: name: Kennedy, M.
name: Chatten, A.J.
name: Farrell, D.
name: Bose, R.
name: Büchtemann, A.
name: McCormack, S.
name: Doran, J.
name: Barnham, K.
name: Norton, B.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 334-337
description: The electrical and spectral output from luminescent solar concentrator (LSC) devices is predicted using thermodynamic modelling and ray-trace modelling techniques. Predicted output from four LSCs of varying dimensions, containing different luminescent dyes, are found to be in good agreement with measured output taken from fabricated LSCs. Despite the many different processes involved in the two modelling approach, predicted short circuit current densities from both approaches are found to be in excellent agreement.
Optical character recognition on heterogeneous SoC for HD automatic number plate recognition system
Creators: name: Farhat, Ali
name: Hommos, Omar
name: Al-Zawqari, Ali
name: Al-Qahtani, Abdulhadi
name: Bensaali, Faycal
name: Amira, Abbes
name: Zhai, Xiaojun
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Information systems
Electronics, sensors and digital hardware

description: Automatic number plate recognition (ANPR) systems are becoming vital for safety and security purposes. Typical ANPR systems are based on three stages: number plate localization (NPL), character segmentation (CS), and optical character recognition (OCR). Recently, high definition (HD) cameras have been used to improve their recognition rates. In this paper, four algorithms are proposed for the OCR stage of a real-time HD ANPR system. The proposed algorithms are based on feature extraction (vector crossing, zoning, combined zoning, and vector crossing) and template matching techniques. All proposed algorithms have been implemented using MATLAB as a proof of concept and the best one has been selected for hardware implementation using a heterogeneous system on chip (SoC) platform. The selected platform is the Xilinx Zynq-7000 All Programmable SoC, which consists of an ARM processor and programmable logic. Obtained hardware implementation results have shown that the proposed system can recognize one character in 0.63 ms, with an accuracy of 99.5% while utilizing around 6% of the programmable logic resources. In addition, the use of the heterogenous SoC consumes 36 W which is equivalent to saving around 80% of the energy consumed by the PC used in this work, whereas it is smaller in size by 95%.Other Information Published in: EURASIP Journal on Image and Video Processing
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1186/s13640-018-0298-2
Utilização dos protocolos dos dados abertos para o acesso à informação no Instituto Nacional de Estatística-INE
Creators: name: Mateus, Delfina Lázaro
name: Nassabe, Jonas Gonçalves
name: Tcheco, Laurinda Alberto
Publisher: name: Zenodo
Year: 2022

description: Apresentação realizada na sessão O meu Póster em 40 segundos da 13ª Conferência Lusófona de Ciência Aberta, formato híbrido, de 10 a 12 de outubro de 2022.
Creativity Training for Future Engineers: Preliminary Results from an Educative Experience
Creators: name: Morin, Sophie
name: Robert, Jean-Marc
name: Gabora, Liane
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Due in part to the increased pace of cultural and environmental change, as well as increased competition due to globalization, innovation is become one of the primary concerns of the 21st century. We present an academic course designed to develop cognitive abilities related to creativity within an engineering education context, based on a conceptual framework rooted in cognitive sciences. The course was held at École Polytechnique de Montréal (ÉPM), a world renowned engineering school and a pillar in Canada's engineering community. The course was offered twice in the 2014-2015 academic year and more than 30 students from the graduate and undergraduate programs participated. The course incorporated ten pedagogical strategies, including serious games, an observation book, individual and group projects, etc., that were expected to facilitate the development of cognitive abilities related to creativity such as encoding, and associative analytical thinking. The CEDA (Creative Engineering Design Assessment) test was used to measure the students' creativity at the beginning and at the end of the course. Field notes were taken after each of the 15 three-hour sessions to qualitatively document the educative intervention along the semester and students gave anonymous written feedback after completing the last session. Quantitative and qualitative results suggest that an increase in creativity is possible to obtain with a course designed to development cognitive abilities related to creativity. Also, students appreciated the course, found it relevant, and made important, meaningful learnings regarding the creative process, its cognitive mechanism and the approaches available to increase it.
description: 10 pages
Analyzing the Effects of Laterally Varying Emitter Sheet Resistance in Combination With Contact Resistance
Creators: name: Grote, D.
name: Hermle, M.
name: Wotke, E.
name: Belledin, U.
name: Hörteis, M.
name: Spitz, M.
name: Kasemann, M.
name: Rein, S.
name: Biro, D.
name: Warta, W.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 278-282
description: In this work the effect of a laterally varying emitter sheet resistance on IV characteristic parameters is analyzed for an industrial like solar cell structure by distributed circuit simulations. The influence of the emitter sheet resistance on contact resistance is considered by an experimentally determined dependence for screen printed contacts on shallow emitters with high surface doping concentration. Production solar cells with flaws in the distribution of the emitter sheet resistance as distinguished from e.g. cell structures with selective emitters are analyzed. In these cases the efficiency of a solar cell with laterally inhomogeneous emitter sheet resistance is decreased compared to the one of a solar cell with laterally homogeneous emitter sheet resistance with the mean value of the distribution. Nevertheless for solar cells with e.g. an emitter inhomogeneity of +/-20% on 20% of the cell area the decrease of efficiency is less than 0.15% relative in case of a moderate dependence between contact resistance and emitter sheet resistance. Hence a laterally inhomogeneous emitter influences the solar cell efficiency primarily by its effect on the contact formation during the firing step. Further effects are negligible.
Effect of speed and gradient on plantar force when running on an AlterG® treadmill
Creators: name: Thomson, Athol
name: Whiteley, Rodney
name: Hansen, Clint
name: Welzel, Julius
name: Racinais, Sebastien
name: Wilson, Mathew G.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Allied health and rehabilitation science

description: Background Anti-gravity treadmills are used to decrease musculoskeletal loading during treadmill running often in return to play rehabilitation programs. The effect different gradients (uphill/downhill running) have on kinetics and spatiotemporal parameters when using an AlterG® treadmill is unclear with previous research focused on level running only. Methods Ten well-trained healthy male running athletes ran on the AlterG® treadmill at varying combinations of bodyweight support (60, 80, and 100% BW), speed (12 km/hr., 15 km/hr., 18 km/hr., 21 km/hr., and 24 km/hr), and gradients (− 15% decline, − 10, − 5, 0, + 5, + 10 + 15% incline), representing a total of 78 conditions performed in random order. Maximum plantar force and contact time were recorded using a wireless in-shoe force sensor insole system. Results Regression analysis showed a linear relationship for maximum plantar force with bodyweight support and running speeds for level running (p < 0.0001, adj. R2 = 0.604). The linear relationship, however, does not hold for negative gradients at speeds 12 & 15 km/h, with a relative ‘dip’ in maximum plantar force across all assisted bodyweight settings. Conclusions Maximum plantar force peaks are larger with faster running and smaller with more AlterG® assisted bodyweight support (athlete unweighing). Gradient made little difference except for a downhill grade of − 5% decreasing force peaks as compared to level or uphill running.Other Information Published in: BMC Sports Science, Medicine and Rehabilitation
 License: http://creativecommons.org/licenses/by/4.0/
See article on publisher's website: http://dx.doi.org/10.1186/s13102-021-00258-4
Transition State Theory for solvated reactions beyond recrossing-free dividing surfaces
Creators: name: Revuelta, F.
name: Bartsch, Thomas
name: Garcia-Muller, P. L.
name: Hernandez, Rigoberto
name: Benito, R. M.
name: Borondo, F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The accuracy of rate constants calculated using transition state theory depends crucially on the correct identification of a recrossing--free dividing surface. We show here that it is possible to define such optimal dividing surface in systems with non--Markovian friction. However, a more direct approach to rate calculation is based on invariant manifolds and avoids the use of a dividing surface altogether, Using that method we obtain an explicit expression for the rate of crossing an anharmonic potential barrier. The excellent performance of our method is illustrated with an application to a realistic model for LiNC$\rightleftharpoons$LiCN isomerization.
description: 5 pages, 3 figures, 1 table
Influence of Grain Boundary Recombination Velocity on Epitaxial Silicon Solar Cell´s Properties According to a 3D Model
Creators: name: Perraki, V.
name: Seretis, P.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 290-293
description: This paper presents a three-dimensional (3D) theoretical model applied on n+pp+ type epitaxial silicon solar cells, illuminated on the n+ side. This model is used to provide results for the optimum photocurrent open-circuit voltage, fill factor and efficiency through variation of grain boundary recombination velocity. We have selected through a simulation program the epitaxial layer thickness of the cells as the device parameter which optimizes these results. The results are computed as a function of Sgb for a group of cells, with medium size grains and a thick epitaxial layer. A comparison also is performed, among 1D, and 3D results of the cell’s quantum efficiency.
Suplementary for Utilizing MinION Nanopore Oxford Technology for Long-read Sequencing from Genomic DNA of Parashorea lucida
Creators: name: Tauhida, Nita
Publisher: name: figshare
Year: 2022
Subjects: subject: 60102 Bioinformatics
subject: FOS: Computer and information sciences
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Plant Biology

description: Annotation vizualisation from scaffold assemblies
An Accurate Analytical Approach Including Internal Reflectance for Calculating Quantum Efficiency of Planar Solar Cells
Creators: name: Abenante, L.
name: Izzi, M.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 302-304
description: An analytical approach for calculating the quantum efficiency of a planar Si solar cell is presented, which is as accurate as the numerical simulation program PC1D v. 5.1. The device under exam is partitioned into regions by applying the depletion approximation. In the non-uniformly doped emitter, the quantum efficiency is calculated analytically by using a reported iterative solution to minority-carrier transport. In the uniformly doped base, it is calculated by solving the minority-carrier transport at boundary conditions for optical spike generation. In the depletion region, it is calculated with the textbook expression. In all of the analytical expressions, a reported optical generation profile function is included, where the internal reflectance values do not depend on the successive encounters of light with internal surfaces, and the average angle of propagation of light is imposed to be zero at all wavelengths. The equivalence between the analytical approach and PC1D v. 5.1 is shown experimentally by fitting quantum efficiency and external reflectance data of actual devices.
Relationship Between Interface Defect Density and Surface Recombination Velocity in (111) and (100) Silicon/ Silicon Oxide Structure
Creators: name: Jin, H.
name: Weber, K.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 244-247
description: A comparison of of the emitter saturation current density Joe and the interface defect density Dit on oxidised, partially hydrogenated silicon samples shows that the interface defect density, and in particular the midgap interface defect density Dit(M), are good indicators of interface recombination, with Dit(M) being nearly proportional to Joe for both (111) and (100) oriented samples. (111) oriented samples display values of Joe around twice those of (100) samples for a given
midgap Dit.
An estimate of the hadronic vacuum polarization disconnected contribution to the anomalous magnetic moment of the muon from lattice QCD
Creators: name: Chakraborty, Bipasha
name: Davies, C. T. H.
name: Koponen, J.
name: Lepage, G. P.
name: Peardon, M. J.
name: Ryan, S. M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The quark-line disconnected diagram is a potentially important ingredient in lattice QCD calculations of the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon. It is also a notoriously difficult one to evaluate. Here, for the first time, we give an estimate of this contribution based on lattice QCD results that have a statistically significant signal, albeit at one value of the lattice spacing and an unphysically heavy value of the $u/d$ quark mass. We use HPQCD's method of determining the anomalous magnetic moment by reconstructing the Adler function from time-moments of the current-current correlator at zero spatial momentum. Our results lead to a total (including $u$, $d$ and $s$ quarks) quark-line disconnected contribution to $a_μ$ of $-0.15\%$ of the $u/d$ hadronic vacuum polarization contribution with an uncertainty which is 1\% of that contribution.
description: 9 pages, 3 figures
New application of superconductors: high sensitivity cryogenic light detectors
Creators: name: Cardani, L.
name: Bellini, F.
name: Casali, N.
name: Casellano, M. G.
name: Colantoni, I.
name: Coppolecchia, A.
name: Cosmelli, C.
name: Cruciani, A.
name: D'Addabbo, A.
name: Di Domizio, S.
name: Martinez, M.
name: Tomei, C.
name: Vignati, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: In this paper we describe the current status of the CALDER project, which is developing ultra-sensitive light detectors based on superconductors for cryogenic applications. When we apply an AC current to a superconductor, the Cooper pairs oscillate and acquire kinetic inductance, that can be measured by inserting the superconductor in a LC circuit with high merit factor. Interactions in the superconductor can break the Cooper pairs, causing sizable variations in the kinetic inductance and, thus, in the response of the LC circuit. The continuous monitoring of the amplitude and frequency modulation allows to reconstruct the incident energy with excellent sensitivity. This concept is at the basis of Kinetic Inductance Detectors (KIDs), that are characterized by natural aptitude to multiplexed read-out (several sensors can be tuned to different resonant frequencies and coupled to the same line), resolution of few eV, stable behavior over a wide temperature range, and ease in fabrication. We present the results obtained by the CALDER collaboration with 2x2 cm2 substrates sampled by 1 or 4 Aluminum KIDs. We show that the performances of the first prototypes are already competitive with those of other commonly used light detectors, and we discuss the strategies for a further improvement.
The effect of a sand surface on physical performance responses of junior male handball players to plyometric training
Creators: name: Hammami, Mehrez
name: Bragazzi, Nicola Luigi
name: Hermassi, Souhail
name: Gaamouri, Nawel
name: Aouadi, Ridha
name: Shephard, Roy J.
name: Chelly, Mohamed Souhaiel
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Allied health and rehabilitation science

description: Background The effects of 7 weeks plyometric training on a stable surface and on sand were compared in junior male handball players. Methods A team of experienced players was divided randomly between three groups, undertaking a standard in-season regimen (C, n = 10), or supplementing this regimen by plyometric training on sand (PS, n = 11) or a stable surface (P, n = 10) for 7 weeks. Assessments included 20 m sprint times, change of direction tests (Modified change-of-direction T-test and Modified Illinois test), a repeated sprint T-test, jumping ability (squat, countermovement and five jump tests), and static and dynamic balance. Results After the intervention, PS showed significant increases of sprint speed relative to P and C. Change of direction scores were also improved for PS relative to P and C. Both PS and P increased vertical jump performance (squat jump, p = 0.005; ES = 0.170; counter-movement jump p < 0.001; ES = 0.247). Repeated sprint T-test scores improved in PS and P relative to C, with best times of PS > P (p < 0.05). Both plyometric groups improved their dynamic balance (p < 0.05), with three parameters of PS and only one of P being significantly greater than C. Static balance was also enhanced in both experimental groups (PS > P). Conclusions We conclude that for reasons that remain to be clarified, several performance measures in adolescent male handball players were increased more by 7 weeks of PS than by P.Other Information Published in: BMC Sports Science, Medicine and Rehabilitation
 License: http://creativecommons.org/licenses/by/4.0/
See article on publisher's website: http://dx.doi.org/10.1186/s13102-020-00176-x
A New Carrier-Generation Profile Function for Planar p-n Junction Solar Cells
Creators: name: Abenante, L.
name: Izzi, M.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
Fundamental Studies

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 305-307
description: A wavelength function for optical generation profile in Si solar cells is presented, where the values of internal reflectances and average angle of propagation of internal light, , do not depend on the subsequent encounters of light with internal surfaces. To be checked, the function is put in a very accurate analytical approach to calculate the quantum efficiency of Si solar cells and used to match the quantum efficiency data of actual devices. The values for internal reflectances, to be assigned in the generation profile function, are obtained by fitting external reflectance data with the textbook expression at  = 0°, in accordance with the literature. For each device, the fitting assignments to internal reflectances,  and absorption coefficient are checked with a procedure based on calculating the effective optical path length factor with both of the expressions available in the literature.
Solid-State Dye-Sensitized Solar Cells: Current State of the Art - Challenges and Opportunities
Creators: name: Lenzmann, F.O.
name: Olson, C.
name: Goris, M.J.
name: Kroon, J.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
New Types of Cells and Modules

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 211-213
description: The first generation of dye-sensitized solar cell technology is based on a liquid electrolyte component. Today, this technology is on the verge of commercialization. The step towards the market and real applications is supported by the prospect low manufacturing costs, good efficiency as well as the expectation that the current stability level of this technology is at least sufficient for applications in mobile electronics. These favorable developments may be reinforced and accelerated even further, if the corrosive liquid electrolyte could be replaced by a non-corrosive solid, since this would ease a number of stringent requirements in the production process. A successful exchange of the liquid electrolyte by a solid-state holeconductor requires to at least maintain, preferably improve, the most relevant technical parameters of the solar cell (efficiency, stability, cost). First pioneering work with solid-state holeconductors was carried out 10 years ago with an initial efficiency level below 1%. Until 2007, the record efficiency could be improved to 5%. This paper gives an overview of the solid-state concept as an early stage approach with good perspectives for the mid-term future (~ 5-10 years).
OrgaPVnet: Building a Realistic Roadmap for Organic Based Photovoltaics
Creators: name: Poortmans, J.
name: Kroon, J.
name: O'Regan, B.
name: Hinsch, A.
name: Brabec, C.J.
name: Woyte, A.
name: Sariciftci, S.
name: Grätzel, M.
name: Lutsen, L.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Advanced Photovoltaics
New Types of Cells and Modules

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 218-221
description: Solar cells with active layers, partially or fully based on organic materials, are the subject of large interest, both from R&D-actors as from large investors. This interest is fuelled by the rapid developments in the field of organic based devices with certified efficiencies between 5 and 6% for full-organic devices and 11% for dye sensitized solar cells, the potentially very low cost of these devices, mechanical flexibility and light weight. The low cost potential is based on the use of low-cost materials and substrates and the very high production speeds which could be reached by roll-to-roll processing. In addition, organic photovoltaic devices take profit of the developments in neighbouring fields like Organic LED’s and thin-film transistors, which could create synergetic effects similar to what was observed for crystalline Si solar cells which took benefit from the large knowledge and equipment base, built up in the micro-electronics sector. Notwithstanding all these promises, there is a strong need to define correctly the technical and scientific challenges, to outline the way these challenges have to be tackled and to define the markets in which these organic photovoltaic devices could create large impact. This is done in the frame of the European Project ORGAPVNET. The paper aims at bringing this information in a concise form to the broader PV-community to improve the understanding of this emerging field, to explain how this information is going to be used to build a dedicated roadmap and to explain the synergies which exist with other fields of organic devices.