cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A novel procedure for constructing invariant subspaces of a set of matrices
Creators: name: Al-Dweik, Ahmad Y.
name: Ghanam, Ryad
name: Thompson, Gerard
name: Azad, Hassan
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Applied mathematics

description: A problem that is frequently encountered in a variety of mathematical contexts is to find the common invariant subspaces of a single or of a set of matrices. A new method is proposed that gives a definitive answer to this problem. The key idea consists of finding common eigenvectors for exterior powers of the matrices concerned. A convenient formulation of the Plücker relations is then used to ensure that these eigenvectors actually correspond to subspaces or provide the initial constraints for eigenvectors involving parameters. A procedure for computing the divisors of a totally decomposable vector is also provided. Several examples are given for which the calculations are too tedious to do by hand and are performed by coding the conditions found into Maple. Our main motivation lies in Lie symmetry, where the invariant subspaces of the adjoint representations for the Lie symmetry algebra of a differential equation must be known explicitly and comprehensively in order to determine all the ideals of the Lie symmetry algebra.Other Information Published in: Annali di Matematica Pura ed Applicata (1923 -)
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10231-022-01233-7
The Health Care System in Ecuador
Creators: name: Palacio, María Gabriela
Publisher: name: Universität Bremen
Year: 2023
Subjects: subject: Ecuador
subject: health
subject: health care
subject: health care system
subject: 300

description: This country report provides a description of the emergence of a health care system under public responsibility in Ecuador. The inception of the health care system refers to the first legislation stipulating entitlements to medical care. The report also includes a brief description of major health care reforms, and the current organization of the health care system in Ecuador. This report is part of the CRC 1342 Social Policy Country Briefs Series.
Investigation of µ-PCD Lifetime of Multicrystalline Silicon Blocks and Wafers
Creators: name: Du, J.
name: Tian, C.
name: Liao, J.
name: Luo, J.
name: Wan, Y.
name: Cui, R.
name: Xu, X.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Silicon Feedstock, Crystallisation and Wafering

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 1247-1249
description: Minority-carrier lifetime is one of the most important parameters to evaluate the quality of multicrystalline silicon (mc-Si) bricks and wafers. The microwave photoconductive decay (μ-PCD) method is generally used for measuring lifetime of as-cut bricks and wafers in the production. In this study, the lifetime of bricks and wafers of different thicknesses was measured using μ-PCD, and the relationship between the measured lifetime values of bricks and wafers was discussed. The effect of the wafer thickness on the measured values was analyzed by comparing mathematical models. The influence of the wavelength of the active laser used in the measurement was discussed by comparing the measurements.
Impact of mainstream classroom setting on attention of children with autism spectrum disorder: an eye-tracking study
Creators: name: Banire, Bilikis
name: Al Thani, Dena
name: Qaraqe, Marwa
name: Mansoor, Bilal
name: Makki, Mustapha
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Human-centred computing
Distributed computing and systems software

description: It has long been reported that children with autism spectrum disorder (ASD) exhibit attention difficulties while learning. They tend to focus on irrelevant information and can easily be distracted. As a result, they are often confined to a one-to-one teaching environment, with fewer distractions and social interactions than would be present in a mainstream educational setting. In recent years, inclusive mainstream schools have been growing in popularity due to government policies on equality rights. Therefore, it is crucial to investigate attentional patterns of children with ASD in mainstream schools. This study aims to explore the attentional behaviors of children with ASD in a virtual reality simulated classroom. We analyzed four eye-gaze behaviors and performance scores of 45 children: children with ASD (ASD n = 20) and typically developing children (TD n = 25) when performing attention tasks. The gaze behaviors included time to first fixate (TTFF), first fixation duration (FFD), average fixation duration (AFD) and the sum of fixation count (SFC) on fourteen areas of interest (AOIs) in the classroom. Our results showed that children with ASD exhibit similar gaze behaviors to TD children, but with significantly lower performance scores and SFC on the target AOI. These findings showed that classroom settings can influence attentional patterns and the academic performance of children with ASD. Further studies are needed on different modalities for supporting the attention of children with ASD in a mainstream setting.Other Information Published in: Universal Access in the Information Society
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10209-020-00749-0
Geometry of compact complex manifolds with maximal torus action
Creators: name: Ustinovskiy, Yury
Publisher: name: arXiv
Year: 2016
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: In this present paper we study geometry of compact complex manifolds equipped with a \emph{maximal} torus $T=(S^1)^k$ action. We give two equivalent constructions providing examples of such manifolds given a simplicial fan $Σ$ and a compelx subgroup $H\subset T_\mathbb C=(\mathbb C^*)^k$. On every manifold $M$ we define the canonical holomorphic foliation $\mathcal F$ and under additional restrictions construct transverse-Kähler form $ω_\mathcal F$. As an application of these constructions, we prove some results on geometry of manifolds~$M$ regarding its analytic subsets.
Synthesis and Characterization of Thallium Sulphide/Cadmium Sulphide and Lead Sulphide/Cadmium Sulphide Thin Films Grown in a Polymer Matrix by Chemical Bath Deposition (CBD) Method
Creators: name: Ezema, F.I.
name: Ezugwu, S.C.
name: Agbo, S.N.
name: Ekwealor, A.B.C.
name: Asogwa, P.U.
name: Osuji, R.U.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 295-298
description: Chemical bath deposition of semiconductor thin films is by now recognized as a versatile low-cost method
to produce thin films of I-VI, II-VI, III-V, IV-VI and V-VI compounds. This technique is the most cost saving,
convenient and simple technique, which is highly reproducible. It makes use of the fact that films can be deposited on
substrates whether metallic or not by dipping them into suitable solution baths containing metal salts without applying
any external field. CdS/PbS and CdS/TlS thin films were synthesized on the glass substrate by this technique within the
pores of polyvinyl alcohol (PVA) at room temperature. The chemical bath for the deposition of CdS is made up of
solution of cadmium chloride (CdCl2), ammonia (NH3), thiourea ((NH2)2CS) and PVA solution. The chemical bath for
the deposition of PbS thin film on clean microscope glass slide was achieved by using lead nitrate (Pb(NO3)2), sodium
hydroxide (NaOH), thiourea ((NH2)2CS) and PVA solution. Thallium sulphide (TlS) thin films were deposited on glass
substrate using a bath that contains thallium nitrate, sodium citrate, sodium hydroxide, thiourea and PVA solution. A
chemical synthesis process for the fabrication of CdS/PbS and CdS/TlS thin films are presented herein. In this present
work, these films were annealed in air at 373K and characterized for the structural, morphological and optical properties.
These properties were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical
spectrophotometer for their potential application in solar energy devices. The optical properties revealed the presence of
direct band gaps with energies 1.20eV for PbS/CdS and 1.40eV for TlS/CdS thin films. The films show poor
transmittance in the visible and near infrared region of the solar spectrum.
Incomplete Tambara functors
Creators: name: Blumberg, Andrew J.
name: Hill, Michael A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Topology (math.AT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics

description: For a "genuine" equivariant commutative ring spectrum $R$, $π_0(R)$ admits a rich algebraic structure known as a Tambara functor. This algebraic structure mirrors the structure on $R$ arising from the existence of multiplicative norm maps. Motivated by the surprising fact that Bousfield localization can destroy some of the norm maps, in previous work we studied equivariant commutative ring structures parametrized by $N_\infty$ operads. In a precise sense, these interpolate between "naive" and "genuine" equivariant ring structures. In this paper, we describe the algebraic analogue of $N_\infty$ ring structures. We introduce and study categories of incomplete Tambara functors, described in terms of certain categories of bispans. Incomplete Tambara functors arise as $π_0$ of $N_\infty$ algebras, and interpolate between Green functors and Tambara functors. We classify all incomplete Tambara functors in terms of a basic structural result about polynomial functors. This classification gives a conceptual justification for our prior description of $N_\infty$ operads and also allows us to easily describe the properties of the category of incomplete Tambara functors.
Universal quantum computation with a nonlinear oscillator network
Creators: name: Goto, Hayato
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It has recently been shown that a parametrically driven oscillator with Kerr nonlinearity yields a Schrödinger cat state via quantum adiabatic evolution through its bifurcation point and a network of such nonlinear oscillators can be used for solving combinatorial optimization problems by bifurcation-based adiabatic quantum computation [H. Goto, Sci. Rep. \textbf{6}, 21686 (2016)]. Here we theoretically show that such a nonlinear oscillator network with controllable parameters can also be used for universal quantum computation. The initialization is achieved by a quantum-mechanical bifurcation based on quantum adiabatic evolution, which yields a Schrödinger cat state. All the elementary quantum gates are also achieved by quantum adiabatic evolution, in which dynamical phases accompanying the adiabatic evolutions are controlled by the system parameters. Numerical simulation results indicate that high gate fidelities can be achieved, where no dissipation is assumed.
description: 5 pages, 4 figures
Polynomial sequences on quadratic curves
Creators: name: Abrate, Marco
name: Barbero, Stefano
name: Cerruti, Umberto
name: Murru, Nadir
Publisher: name: arXiv
Year: 2015
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this paper we generalize the study of Matiyasevich on integer points over conics, introducing the more general concept of radical points. With this generalization we are able to solve in positive integers some Diophantine equations, relating these solutions by means of particular linear recurrence sequences. We point out interesting relationships between these sequences and known sequences in OEIS. We finally show connections between these sequences and Chebyshev and Morgan-Voyce polynomials, finding new identities.
ORBKIT - A Modular Python Toolbox for Cross-Platform Post-Processing of Quantum Chemical Wavefunction Data
Creators: name: Hermann, Gunter
name: Pohl, Vincent
name: Tremblay, Jean Christophe
name: Paulus, Beate
name: Hege, Hans-Christian
name: Schild, Axel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: ORBKIT is a toolbox for post-processing electronic structure calculations based on a highly modular and portable Python architecture. The program allows computing a multitude of electronic properties of molecular systems on arbitrary spatial grids from the basis set representation of its electronic wavefunction, as well as several grid-independent properties. The required data can be extracted directly from the standard output of a large number of quantum chemical programs. ORBKIT can be used as a standalone program to determine standard quantities, for example, the electron density, molecular orbitals, and derivatives thereof. The cornerstone of ORBKIT is its modular structure. The existing basic functions can be arranged in an individual way and can be easily extended by user-written modules to determine any other desired quantities. ORBKIT offers multiple output formats that can be processed by common visualization tools (VMD, Molden, etc.). Additionally, ORBKIT possesses routines to order molecular orbitals computed at different nuclear configurations according to their electronic character and to interpolate the wavefunction between these configurations. The program is open-source under GNU-LGPLv3 license and freely available at http://sourceforge.net/projects/orbkit/. This article provides an overview of ORBKIT with particular focus on its capabilities and applicability, and includes several example calculations.
Sustainable alkali-activated binders with municipal solid waste incineration ashes as sand or fly ash replacement
Creators: name: Irshidat, Mohammad R.
name: Al-Nuaimi, Nasser
name: Rabie, Mohamed
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Materials engineering
subject: FOS: Materials engineering
subject: Environmental engineering
subject: FOS: Environmental engineering

description: The present study investigates the feasibility of using two types of municipality solid wastes incineration ashes, namely, fly ash and bottom ash in the production of sustainable alkali-activated binder. The ashes are collected from the incineration plant and characterized to determine their particle size distribution, specific gravity, chemical composition, and heavy metals content. The ashes are then used as either fly ash or sand replacement with five replacement ratios 0%, 5%, 10%, 15%, and 20% to produce the binder. The produced binder are characterized in terms of strength, workability, density, water absorption, thermal conductivity and stability, chemical composition, and heavy metals content. The results reflect the ability of producing sustainable alkali-activated binder with small dosage of MSWI ashes as either fly ash or sand replacement without negatively affecting its strength, workability, density, and water absorption. The ashes enhance the thermal insulation capability of the binder.Other Information Published in: Journal of Material Cycles and Waste Management
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10163-022-01374-0
Photoluminescence Characterization of Te-Doped GaSb for TPV Applications
Creators: name: Vlasov, A.S.
name: Khvostikov, V.P.
name: Rakova, E.P.
name: Sorokina, S.V.
name: Andreev, V.M.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 310-312
description: Photoluminescence characterization of Czochralski-grown Te-doped GaSb wafers is presented. The
wafers with the doping level from 2*1017 cm-3 to 2*1018 cm-3 have been studied. Calculations of photoluminescence
line shape of Te-doped GaSb wafers at 77 K have been performed. It is demonstrated that the photoluminescence line
shape analysis can be used for the native defect concentration estimation. The doping level obtained from the
photoluminescence data is correlated with the results of the Hall mobility measurements. The native defect
concentration has been obtained with the help of the developed analysis. A comparative study of photovoltaic cells
manufactured from different wafers is presented. It is shown that the defect concentration obtained by the
photoluminescence measurements can be treated as a reference value for material characterization.
Minimum marginal abatement cost curves (Mini-MAC) for CO2 emissions reduction planning
Creators: name: Lameh, Mohammad
name: Al-Mohannadi, Dhabia M.
name: Linke, Patrick
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Environmental biotechnology
subject: FOS: Environmental biotechnology
subject: Environmental and resources law

description: The economic impact of CO2 emissions reduction requirements demands strategic planning to identify low-cost CO2 mitigation pathways from combinations of the many available CO2 emissions reduction options. Different tools have been developed to plan minimal cost CO2 reduction pathways taking into consideration various options such as CO2 capture, utilization, and sequestration (CCUS), shifting from fossil to renewable energy sources, as well as adopting sector-specific low emissions technologies. Current methods used to support strategic planning include high-level tools that cannot account for many possible options or fail to incorporate cost objective, and complex optimization approaches that are capable of identifying detailed low-cost solutions yet are demanding to use and often yield complex solutions in terms of processing schemes that are not easily understood by strategic planners. To address these limitations, a simple and clear methodology is proposed that allows to determine minimum cost CO2 reduction pathways from the rich set of available options. The novel methodology employs an algebraic targeting technique that yields minimum marginal abatement cost (Mini-MAC) curves to clearly represent the low-cost CO2 emissions reduction pathway available. The application of the methodology is illustrated with an example to develop minimum cost emissions reduction pathways considering CCUS, power shifting options, and negative emissions technologies. The benefits of the proposed Mini-MAC curves over alternative methods stem from their richness in terms of assessing CCUS, energy management options, and various integration options. Further, the clarity of the proposed Mini-MAC curves enables planners to easily understand available minimum cost pathways when developing strategies aimed at achieving low-cost CO2 emissions reduction. Graphical abstractOther Information Published in: Clean Technologies and Environmental Policy
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10098-021-02095-y
Electrodeposition of Contact Grids on Thin Film Solar Cells
Creators: name: Hovestad, A.
name: Rendering, H.
name: Goux, A.
name: Kregting, R.
name: Van Neer, M.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 279-281
description: On thin film solar cells transparent conductive oxide (TCO) window layers combining electrical
conductivity with optical transmission are used as front contacts for cell interconnection. TCO layers have an
inherent trade-off between sheet resistance and optical transmission resulting in power losses in cell interconnection
through a TCO front contact. Metal front contact grids allow relaxing the requirements on TCO resistance enabling
thinner and cheaper TCO layers with high optical transparency. This paper describes the use of patterned
electrodeposition technology for the application of metallic front contact grids. By model power loss calculations of
various grid dimensions and the electrodeposition of Cu and Ni grids the potential of patterned electrodeposition as a
cost-effective technology to reduce power losses on thin film solar cells is shown.
Molecular characterization of clinical carbapenem-resistant Enterobacterales from Qatar
Creators: name: Abid, Fatma Ben
name: Tsui, Clement K. M.
name: Doi, Yohei
name: Deshmukh, Anand
name: McElheny, Christi L.
name: Bachman, William C.
name: Fowler, Erin L.
name: Albishawi, Ahmed
name: Mushtaq, Kamran
name: Ibrahim, Emad B.
name: Doiphode, Sanjay H.
name: Hamed, Manal M.
name: Almaslmani, Muna A.
name: Alkhal, Abdullatif
name: Butt, Adeel A.
name: Omrani, Ali S.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Clinical sciences
Medical microbiology

description: One hundred forty-nine carbapenem-resistant Enterobacterales from clinical samples obtained between April 2014 and November 2017 were subjected to whole genome sequencing and multi-locus sequence typing. Klebsiella pneumoniae (81, 54.4%) and Escherichia coli (38, 25.5%) were the most common species. Genes encoding metallo-β-lactamases were detected in 68 (45.8%) isolates, and OXA-48-like enzymes in 60 (40.3%). blaNDM-1 (45; 30.2%) and blaOXA-48 (29; 19.5%) were the most frequent. KPC-encoding genes were identified in 5 (3.6%) isolates. Most common sequence types were E. coli ST410 (8; 21.1%) and ST38 (7; 18.4%), and K. pneumoniae ST147 (13; 16%) and ST231 (7; 8.6%).Other Information Published in: European Journal of Clinical Microbiology & Infectious Diseases
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10096-021-04185-7
Switching current distributions in InAs nanowire Josephson junctions
Creators: name: Kim, Bum-Kyu
name: Doh, Yong-Joo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report on the switching current distributions in nano-hybrid Josephson junctions made of InAs semiconductor nanowires. Temperature dependence of the switching current distribution can be understood by motion of Josephson phase particle escaping from a tilted washboard potential, fitted well to the macroscopic quantum tunneling, thermal activation and phase diffusion models, depending on temperature. Application of gate voltage to tune the Josephson coupling strength enables us to adjust the effective temperature for the escaping process, which would be promising for developing gate-tunable superconducting phase qubits.
description: Accepted in Journal of the Korean Physical Society
HapticSnakes: multi-haptic feedback wearable robots for immersive virtual reality
Creators: name: Al-Sada, Mohammed
name: Jiang, Keren
name: Ranade, Shubhankar
name: Kalkattawi, Mohammed
name: Nakajima, Tatsuo
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Human-centred computing
Graphics, augmented reality and games

description: Haptic feedback plays a large role in enhancing immersion and presence in VR. However, previous research and commercial products have limitations in terms of variety and locations of delivered feedbacks. To address these challenges, we present HapticSnakes, which are snake-like waist-worn robots that can deliver multiple types of feedback in various body locations, including taps-, gestures-, airflow-, brushing- and gripper-based feedbacks. We developed two robots, one is lightweight and suitable for taps and gestures, while the other is capable of multiple types of feedback. We presented a design space based on our implementations and conducted two evaluations. Since taps are versatile, easy to deliver and largely unexplored, our first evaluation focused on distinguishability of tap strengths and locations on the front and back torso. Participants had highest accuracy in distinguishing feedback on the uppermost regions and had superior overall accuracy in distinguishing feedback strengths over locations. Our second user study investigated HapticSnakes’ ability to deliver multiple feedback types within VR experiences, as well as users’ impressions of wearing our robots and receiving novel feedback in VR. The results indicate that participants had distinct preferences for feedbacks and were in favor of using our robots throughout. Based on the results of our evaluations, we extract design considerations and discuss research challenges and opportunities for developing multi-haptic feedback robots.Other Information Published in: Virtual Reality
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10055-019-00404-x
Performance of a 230 kWp Solar Park in Spain with Two-Axis Trackers from a European Market Leader
Creators: name: Grottke, M.
name: Beck, O.
name: Helm, P.
name: Guerrero, J.
name: Martínez, J.
name: Espín, F.
name: Gehrlicher, K.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV Power Plants

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4080-4082
description: By 2006, when the 28 2-Axis trackers were installed, this solar park was the first of six reference parks
in all over Spain using such trackers, so called movers. By the end of 2008 the manufacturer Solon had supplied
around 10.000 such movers. Today this Solon mover type is one of the most popular two-axis tracking systems
offered on the European market. This paper presents performance results of the system and identifies the
optimization potential for this reliable and robust two-axis tracking PV technology. The original tracker achieves
yields of 2.000 kWh/kWp in Murcia / Spain. Yields of over 2.100 kWh/kWp can be achieved via minor system
optimization. An automatic data retrieval and graphic visualisation programme was developed to allow for an
effective and quick function control of the park. This system significantly supports the O&M team and minimizes
losses due to system down-times.
title: Osservatorio Sardo sulla Sicurezza Stradale 2024
Creators: name: Fancello, Gianfranco
name: Podda, Simone
name: Pinna, Michele
name: Porcu, Edoardo
name: Ponti, Massimiliano
Publisher: name: UNICApress
Year: 2025

description: L'obiettivo è quello di fornire una descrizione dello stato attuale dell’incidentalità stradale, riflettendo anche sull’evoluzione delle casistiche rispetto al passato. Il documento fornisce prima di tutto un inquadramento della situazione a livello mondiale ed europea, passando per quelli che erano e sono gli obiettivi comuni di riduzione di morti e feriti a causa dei sinistri stradali. Dopo una descrizione del dato a livello nazionale, si passa ad un’analisi più approfondita della casistica nella Regione Sardegna: in particolare, vengono descritti i dati a livello provinciale e per i grandi centri urbani, evidenziando le strade che presentano un maggior livello incidentalità e localizzazione di punti neri, ovvero di quei tratti stradali dove si osserva una concentrazione elevata di sinistri. Per rendere la consultazione rapida ed intuitiva, questo documento è redatto in forma sintetica e predilige l'uso di infografiche. I dati più aggiornati si riferiscono all’anno 2023 (i più recenti a disposizione al momento della pubblicazione).
Feature fusion based on joint sparse representations and wavelets for multiview classification
Creators: name: Akbari, Younes
name: Elharrouss, Omar
name: Al-Maadeed, Somaya
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Artificial intelligence
Computer vision and multimedia computation

description: Feature-level-based fusion has attracted much interest. Generally, a dataset can be created in different views, features, or modalities. To improve the classification rate, local information is shared among different views by various fusion methods. However, almost all the methods use the views without considering their common aspects. In this paper, wavelet transform is considered to extract high and low frequencies of the views as common aspects to improve the classification rate. The fusion method for the decomposed parts is based on joint sparse representation in which a number of scenarios can be considered. The presented approach is tested on three datasets. The results obtained by this method prove competitive performance in terms of the datasets compared to the state-of-the-art results.Other Information Published in: Pattern Analysis and Applications
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10044-022-01110-2
Computational investigation of cobalt and copper bis (oxothiolene) complexes as an alternative for olefin purification
Creators: name: Sredojević, Dušan N.
name: Raju, Rajesh K.
name: Moncho, Salvador
name: Belić, Milivoj R.
name: Brothers, Edward N.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Inorganic chemistry
Theory of computation

description: Considering that olefins present a large volume feedstock, it is reasonable to expect that their purification is industrially critical. After the discovery of the nickel bis (dithiolene) complex Ni(S2C2(CF3)2)2 that exhibits electro-catalytic activity with olefins but tends to decompose by a competitive reaction route, related complexes have been explored experimentally and theoretically. In this paper, a computational examination is performed on differently charged cobalt and copper bis (oxothiolene) complexes [M (OSC2(CN)2)2] to test their potential applicability as the catalysts for olefin purification, using the simplest olefin, ethylene. Possible reaction pathways for ethylene addition on these complexes were explored, to determine whether some of these candidates can avoid the reaction route that leads to decomposition, which is distinctive from the nickel complex, and to form stable adducts that can subsequently release ethylene by reduction. Our calculations suggest that the neutral cobalt complex might be an alternative catalyst, because all its forms can bind ethylene to produce stable interligand adducts with moderate to low activation barriers, rather than to form intraligand adducts that lead to decomposition. The calculations also predict that these interligand adducts are capable of releasing ethylene upon reduction. In addition, it can produce the desired interligand adducts following two different reaction pathways, assigned as the direct and the indirect, with no need for anion species as co-catalysts, which is crucial for the nickel complex. Thus, the olefin purification process could be much simpler by using this catalyst.Other Information Published in: Journal of Molecular Modeling
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00894-020-04445-x
First Results of Wafering With Laser Chemical Processing
Creators: name: Hopman, S.
name: Fell, A.
name: Mayer, K.
name: Mesec, M.
name: Willeke, G.P.
name: Kray, D.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Cells and Materials, Processing Technology of

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 1131-1135
description: This paper deals with the progress of development of a new cutting method for thin silicon solar wafers with liquid-jet-guided lasers (LaserMicroJet® (LMJ®) and Laser Chemical Processing (LCP)). Several laser systems with different wavelengths were tested to find the optimum laser system and process parameters in terms of wafering. Water and potassium hydroxide were used as carrier liquids to investigate the enhancement of laser ablation by etching. The ablation efficiency was defined as target parameter for optimization and experimentally determined by performing single laser grooves. With a 532 nm laser system a 20 mm deep laser cut and with a long pulse 1064 nm laser a 70 mm deep cut was achieved.
The electronic origin of the ground state spectral features and excited state deactivation in cycloalkanones: the role of intermolecular H-bonding in neat and binary mixtures of solvents
Creators: name: Al-Ansari, Ibrahim Ahmed Z.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Inorganic chemistry
Theory of computation

description: In this study, a D–A cycloalkanone (K1) has been investigated by steady state absorption and fluorescence in neat solvents and in three binary mixtures of nonpolar aprotic/polar protic, polar aprotic/polar protic, and polar protic/polar protic solvents. The experimental findings were complemented by density functional theory (DFT), time-dependent density functional theory (TD-DFT), and NBO quantum-mechanical calculations. Experimentally, effective changes in absorption and fluorescence were observed by solute–solvent interaction. The binary K1-solvent1-solv2 configuration, modeled at the B3LYP-DFT level, confirms involvement of inter-molecular H-bonding with the carbonyl C=O in the fluorescence deactivation process (quenching). This is supported by considerable electron delocalization from C=O to the solvent’s hydroxyl (nO → σ*H-O). This type of hyperconjugation was found to be the main driver for solute–solvent stabilization.Other Information Published in: Journal of Molecular Modeling
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00894-019-4015-6
Preparation of Reactively Sputtered SnO2:Sb Electrodes with the Application of TiO2 Layers
Creators: name: Montero, J.
name: Herrero, J.
name: Guillén, C.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 276-278
description: A new emerging generation of photovoltaic devices needs the development of new high-efficient
electrodes. One common feature is that the side exposed to the sun must have a current collector electrode based on
transparent conducting oxides (TCOs). One possibility could be a TCO based on a double-layered antimony-doped
tin oxide (ATO)/ titanium oxide (TiO2) film developed for dye-sensitized solar cells by using DC reactive magnetron
sputtering. It has been found that doping SnO2 with Sb improves both, transmittance and conductivity because the
density of free charge carriers increases. ATO thin films with adequate properties in terms of light transparency and
conductivity were obtained using room temperature processes by oxygen-reactive DC magnetron sputtering. Effects
of the O2/(Ar+O2) ratio in the sputter flow gas has been studied. Results regarding to optical and electrical properties,
microstructure and composition measurements, and the influence on the film properties by the application of
sputtered films of TiO2 onto SnO2:Sb coated glass substrates were investigated.
Effects of Post-Metallisation Treatments on the Electrical and Photovoltaic Characteristics of Silicon Quantum Dot Solar Cells on Quartz Substrates
Creators: name: Di, D.
name: Perez-Wurfl, I.
name: Gentle, A.
name: Kim, D.-H.
name: Hao, X.
name: Shi, L.
name: Conibeer, G.
name: Green, M.A.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 213-217
description: As an important step towards the realisation of silicon-based tandem solar cells using silicon quantum
dots embedded in a silicon dioxide (SiO2) matrix, single junction silicon quantum dot (Si QD) solar cells on quartz
substrates have been fabricated. The total thickness of the solar cell material is 420 nm. The cells contain 4 nm
diameter Si quantum dots. The impacts of post-metallisation treatments such as phosphoric acid (H3PO4) etching,
nitrogen (N2) gas anneal and forming gas (Ar: H2) anneal on the cells’ electrical and photovoltaic properties have
been investigated. The Si QD solar cells studied in this work have achieved an open circuit voltage of 410 mV after
various processes. Parameters extracted from dark I-V, light I-V and circular transfer length measurement (CTLM)
suggest limiting mechanism in the Si QD solar cell operation and possible approaches for further improvement.
Phonon Lifetimes in Model Quantum Dot Superlattices
Creators: name: Patterson, R.
name: Kirkengen, M.
name: Puthen-Veettil, B.
name: König, D.
name: Green, M.
name: Conibeer, G.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 222-228
description: It has been proposed that slowed phonon decay and correspondingly long “hot” carrier lifetimes could
be obtained through the careful engineering of quantum dot (QD) superlattices (SLs). These QD superlattices would
have applications to Hot Carrier Solar Cells (HCSCs). Here, two QD superlattice geometries, FCC and HCP, are
investigated numerically to see if these geometries yield the desired properties for long phonon lifetimes and slowed
carrier cooling. The result is that the HCP system yields quite large phonon bandgaps for features of a reasonable
size. Typical phonon lifetimes in HCP superlattices are on the order of 22 ps for a 1.8 nm diameter QD. The FCC
system, for extremely small feature sizes and precise spacing, appears to yield the required phonon bandgap to
inhibit first order phonon decay processes almost entirely. For the FCC SL geometry, high energy phonon lifetimes
should be greatly enhanced.
Physical Properties of Polycrystalline SnS Thin Films for Solar Cells
Creators: name: Zaretskaya, E.P.
name: Gremenok, V.F.
name: Ivanov, V.A.
name: Bashkirov, S.A.
name: Zalesski, V.B.
name: Kovalevski, B.I.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 262-265
description: Polycrystalline SnS thin films have been prepared using a two-step process consisting of annealing of Sn
precursors in S ambient. The effect of the growth conditions on the structural, optical and electrical properties was
investigated using XRD, SEM, AES and optical absorption measurements. X-ray diffraction studies have shown that
sulfurization temperature (Ts) affects crystalline structure of the deposited material as well as its optoelectronic properties.
Single phase SnS films of orthorhombic structure (OR) with [040] preferred orientation were formed under temperatures
between 250 and 350 °C. SnS films were of p-type conductivity and had electrical resistivity of 4.101 – 2.102 .cm and
thermopower value of 240 – 950 μv.K–1. The films were highly absorbing with an optical absorbing coefficient over 104 cm–1
near the fundamental absorption edge. The calculated direct optical band gap value (Eg) for single phase SnS films varied in
the range Eg = 1.15 – 1.24 eV.
Association of periodontal therapy, with inflammatory biomarkers and complications in COVID-19 patients: a case control study
Creators: name: Said, Khalid N.
name: Al-Momani, Ahmed M.
name: Almaseeh, Jassim A.
name: Marouf, Nadya
name: Shatta, Amer
name: Al-Abdulla, Jassim
name: Alaji, Sahar
name: Daas, Hanin
name: Tharupeedikayil, Shailaja S.
name: Chinta, Venkateswara Rao
name: Hssain, Ali Ait
name: Abusamak, Mohammad
name: Salih, Shiraz
name: Barhom, Noha
name: Cai, Wenji
name: Sanz, Mariano
name: Tamimi, Faleh
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Dentistry
subject: FOS: Clinical medicine

description: Background In previous studies, COVID-19 complications were reported to be associated with periodontitis. Accordingly, this study was designed to test the hypothesis that a history of periodontal therapy could be associated with lower risk of COVID-19 complications. Methods A case–control study was performed using the medical health records of COVID-19 patients in the State of Qatar between March 2020 and February 2021 and dental records between January 2017 and December 2021. Cases were defined as COVID-19 patients who suffered complications (death, ICU admissions and/or mechanical ventilation); controls were COVID-19 patients who recovered without major complications. Associations between a history of periodontal therapy and COVID-19 complications were analysed using logistic regression models adjusted for demographic and medical factors. Blood parameters were compared using Kruskal–Wallis test. Results In total, 1,325 patients were included. Adjusted odds ratio (AOR) analysis revealed that non-treated periodontitis was associated with significant risk of need for mechanical ventilation (AOR = 3.91, 95% CI 1.21–12.57, p = 0.022) compared to periodontally healthy patients, while treated periodontitis was not (AOR = 1.28, 95% CI 0.25–6.58, p = 0.768). Blood analyses revealed that periodontitis patients with a history of periodontal therapy had significantly lower levels of D-dimer and Ferritin than non-treated periodontitis patients. Conclusion Among COVID-19 patients with periodontal bone loss, only those that have not received periodontal therapy had higher risk of need for assisted ventilation. COVID-19 patients with a history of periodontal therapy were associated with significantly lower D-dimer levels than those without recent records of periodontal therapy. Clinical relevance The fact that patients with treated periodontitis were less likely to suffer COVID-19 complications than non-treated ones further strengthen the hypothesis linking periodontitis to COVID-19 complications and suggests that managing periodontitis could help reduce the risk for COVID-19 complications, although future research is needed to verify this. Other Information Published in: Clinical Oral Investigations
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00784-022-04631-6
RDFFrames: knowledge graph access for machine learning tools
Creators: name: Mohamed, Aisha
name: Abuoda, Ghadeer
name: Ghanem, Abdurrahman
name: Kaoudi, Zoi
name: Aboulnaga, Ashraf
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Information systems
Electronics, sensors and digital hardware

description: Knowledge graphs represented as RDF datasets are integral to many machine learning applications. RDF is supported by a rich ecosystem of data management systems and tools, most notably RDF database systems that provide a SPARQL query interface. Surprisingly, machine learning tools for knowledge graphs do not use SPARQL, despite the obvious advantages of using a database system. This is due to the mismatch between SPARQL and machine learning tools in terms of data model and programming style. Machine learning tools work on data in tabular format and process it using an imperative programming style, while SPARQL is declarative and has as its basic operation matching graph patterns to RDF triples. We posit that a good interface to knowledge graphs from a machine learning software stack should use an imperative, navigational programming paradigm based on graph traversal rather than the SPARQL query paradigm based on graph patterns. In this paper, we present RDFFrames, a framework that provides such an interface. RDFFrames provides an imperative Python API that gets internally translated to SPARQL, and it is integrated with the PyData machine learning software stack. RDFFrames enables the user to make a sequence of Python calls to define the data to be extracted from a knowledge graph stored in an RDF database system, and it translates these calls into a compact SPQARL query, executes it on the database system, and returns the results in a standard tabular format. Thus, RDFFrames is a useful tool for data preparation that combines the usability of PyData with the flexibility and performance of RDF database systems.Other Information Published in: The VLDB Journal
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00778-021-00690-5
On projectional skeletons in Vašák spaces
Creators: name: Kalenda, Ondřej F. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46B26, 03C30

description: We provide an alternative proof of the theorem saying that any Vašák (or, weakly countably determined) Banach space admits a full $1$-projectional skeleton. The proof is done with the use of the method of elementary submodels and is comparably simple as the proof given by W.~Kubiś (2009) in case of weakly compactly generated spaces.
description: 9 pages. arXiv admin note: text overlap with arXiv:1511.01086
COVID-19 exit strategy during vaccine implementation: a balance between social distancing and herd immunity
Creators: name: Daher-Nashif, Suhad
name: Al-Anany, Rania
name: Ali, Menatalla
name: Erradi, Khadija
name: Farag, Elmoubasher
name: Abdallah, Abdallah M.
name: Emara, Mohamed M.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Public health

description: Currently, health authorities around the world are struggling to limit the spread of COVID-19. Since the beginning of the pandemic, social distancing has been the most important strategy used by most countries to control disease spread by flattening and elongating the epidemic curve. Another strategy, herd immunity, was also applied by some countries through relaxed control measures that allow the free spread of natural infection to build up solid immunity within the population. In 2021, COVID-19 vaccination was introduced with tremendous effort as a promising strategy for limiting the spread of disease. Therefore, in this review, we present the current knowledge about social distancing, herd immunity strategies, and aspects of their implementation to control the COVID-19 pandemic in the presence of the newly developed vaccines. Finally, we suggest a short-term option for controlling the pandemic during vaccine application.Other Information Published in: Archives of Virology
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00705-022-05495-7
Solar Cells Above the Arctic Circle - Measuring Characteristics of Solar Panels under Real Operating Conditions
Creators: name: Good, C.
name: Persson, H.
name: Kleven, Ø
name: Sulkowski, W.
name: Ellingsen, K.
name: Boström, T.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV Power Plants

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4094-4098
description: This paper describes the setup of a testing stand for PV modules including a two-axis solar tracker,
weather station and sensors to monitor both panel performance and the surrounding. The location is Narvik in
Northern Norway, which means that the system will be subjected to extreme shifts in weather and solar irradiation.
The objective of the outdoor PV lab is to monitor the performance and of the panels under real operating conditions
for an extended time period. It will as well be used for testing, demonstration, education purposes, and to show that
there is potential in the use of solar energy at northern latitudes.