cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Predictive value of tyrosine phosphatase receptor gamma for the response to treatment tyrosine kinase inhibitors in chronic myeloid leukemia patients
Creators: name: Ismail, Mohamed A.
name: Vezzalini, Marzia
name: Morsi, Hisham
name: Abujaber, Ahmad
name: Al Sayab, Ali
name: Siveen, Kodappully
name: Yassin, Mohamed A.
name: Monne, Maria
name: Samara, Muthanna
name: Cook, Richard
name: Sorio, Claudio
name: Modjtahedi, Helmout
name: Al-Dewik, Nader I.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Oncology and carcinogenesis

description: Protein tyrosine phosphatase receptor gamma (PTPRG) is a member of the receptor-like family protein tyrosine phosphatases and acts as a tumor suppressor gene in different neoplasms. Recent studies reported the down-regulation of PTPRG expression levels in Chronic Myeloid Leukemia disease (CML). In addition, the BCR-ABL1 transcript level is currently a key predictive biomarker of CML response to treatment with Tyrosine Kinase Inhibitors (TKIs). The aim of this study was to employ flow cytometry to monitor the changes in the expression level of PTPRG in the white blood cells (WBCs) of CML patients at the time of diagnosis and following treatment with TKIs. WBCs from peripheral blood of 21 CML patients were extracted at diagnosis and during follow up along with seven healthy individuals. The PTPRG expression level was determined at protein and mRNA levels by both flow cytometry with monoclonal antibody (TPγ B9-2) and RT-qPCR, and BCR-ABL1 transcript by RT-qPCR, respectively. PTPRG expression was found to be lower in the neutrophils and monocytes of CML patients at time of diagnosis compared to healthy individuals. Treatment with TKIs nilotinib and Imatinib Mesylate restored the expression of PTPRG in the WBCs of CML patients to levels observed in healthy controls. Moreover, restoration levels were greatest in optimal responders and occurred earlier with nilotinib compared to imatinib. Our results support the measurement of PTPRG expression level in the WBCs of CML patients by flow cytometry as a monitoring tool for the response to treatment with TKIs in CML patients.Other Information Published in: Scientific Reports
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1038/s41598-021-86875-y
Novel Schemes of p+ poly-Si Hydrogenation Implemented in Industrial 6'' Bifacial Front-and-Rear Passivating Contacts Solar Cells
Creators: name: Stodolny, M.K.
name: Anker, J.
name: Tool, C.J.J.
name: Koppes, M.
name: Mewe, A.A.
name: Manshanden, P.
name: Lenes, M.
name: Romijn, I.G.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Homojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 414-417
description: In this paper we present our latest developments in bifacial 6” cells featuring polysilicon carrier-selective passivating contacts which can be seen as an upgrade to bifacial cell architectures such as PERC+ and PERT. In this study we present improvements of p+ polySi passivation on industrially relevant textured surfaces by means of advanced hydrogenation schemes, involving novel dielectric stacked layers, and modification of the B-profile leading to a record passivation level of ~8 fA/cm2 and 724 mV before firing and ~9 fA/cm2 and 722 mV after firing. The results promote industrial implementation of p+ polySi on 6” bifacial cells with excellent passivation properties and compatibility with screen-printed and fire-through metallization, especially as our latest results show Jo,contact being reduced down to 200 fA/cm2. Bifacial solar cells have been manufactured with industry compatible processing with front-and-rear passivating contacts with efficiencies above 20% in the first attempt and this development shows a potential of 23% with a bifaciality factor of 90%.
Passivating Contacts for Silicon Solar Cells Made of Al2O3 and TiOx Nanolayer Systems
Creators: name: Tröger, D.
name: Grube, M.
name: Knaut, M.
name: Reif, J.
name: Bartha, J.W.
name: Mikolajick, T.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Homojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 426-430
description: Local contacts for PERC solar cells reduce the cell efficiency by carrier recombination at the silicon-metal interface. This study investigates the possibility to avoid local contacts by using a full area contact with passivating behavior. The proposed structure is a double layer system consisting of a passivating Al2O3 and a conducting TiOx. The work focuses on the enhancement of the conductivity of TiOx and the entire contact stack. The resistance of the TiOx could be decreased by doping the TiOx with tantalum and interface engineering by employing a metallic titanium interlayer. The use of Ta:TiOx led to a reduction of resistance of the contact stack by approximately 40 % compared to pure TiOx. This could be enhanced further to 46 % by the addition of a 3 nm thick metallic Ti interlayer. The combined Al2O3/TiOx and interlayer approach yielded a surface recombination velocity of 100 and 160 cm/s for TiOx and doped Ta:TiOx, respectively.
Superelastic softening of ferroelastic multidomain crystals
Creators: name: Schranz, W.
name: Kabelka, H.
name: Tröster, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Many proper and improper ferroelastic materials display (at sufficiently low measurement frequencies) a huge elastic softening below Tc. This giant elastic softening, which can be suppressed with uniaxial stress, is caused by domain wall motion. Here we shortly review our results on frequency and temperature dependent elastic measurements of some perovskites which exhibit improper ferroelastic phase transitions. We also present a new model - based on Landau-Ginzburg theory including long range interaction of needle shaped ferroelastic domains - which describes superelastic softening observed in some of the perovskite systems very well. We also show, howthe theory can be extended to describe proper ferroelastic materials and apply the theory to describe the elastic behaviour of the proper ferroelastic material La1-xNdxP5O14 (LNPP).
Benefits of Pattern Transfer Printing Method for Finger Metallization on Silicon Solar Cells
Creators: name: Adrian, A.
name: Rudolph, D.
name: Lossen, J.
name: Matusovsky, M.
name: Chandrasekaran, V.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Heterojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 434-438
description: In this work, a new technology for the finger metallization on the solar cells, called Pattern Transfer Printing (PTP), is introduced and compared with the screen printing (SP) technology as reference. PTP is a contactless printing technology, which is based on laser induced deposition from a polymer substrate (called tape). Using trench width of 20 μm in the tape, the PTP technology is able to produce ultra-fine-line fingers (< 20 μm) with high aspect ratio (> 0.5). Therefore, the Jsc is increased significantly due to less shadowing and a cell efficiency of 21.8% for a finger cross section of 200 μm². This is a gain of +0.15%abs compared to the SP reference with 35 μm finger opening and simultaneously the silver paste consumption is reduced by 40 mg (-57%). As second reference group double printing with 20 μm finger opening screen is used to achieve a comparable aspect ratio. This results in a similar cell efficiency as for the single print with 35 μm finger opening but with higher paste consumption. The results show, that today the PTP technology is an attractive technology to replace SP for the finger metallization and enable to achieve ultra-fine-line finger printing below 20 μm.
Electron-Selective Contact Using i-a-Si:H/TiOx/Yb/Ag Stack for Silicon Heterojunction Solar Cells
Creators: name: Cho, J.
name: Recamán Payo, M.
name: Debucquoy, M.
name: Sivaramakrishnan Radhakrishnan, H.
name: Gordon, I.
name: Szlufcik, J.
name: Ghannam, M.Y.
name: Poortmans, J.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Homojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 431-433
description: Silicon heterojunction (SHJ) solar cells can be manufactured through relatively simple process steps. However, optoelectrical losses in doped a-Si:H and complex optimization of the doping process makes the cell fabrication difficult. Therefore, an electron contact without n-a-Si:H would be interesting and the i-a-Si:H/TiOx/low work function metal (ATOM) contact could be one of the alternatives. In this study, TiOx grown by ALD and Yb (: 2.5-2.6 eV) are used in the ATOM contact. Specific contact resistivities (c) and dark saturation current density at metalized area (J0,metal) are investigated as a function of a TiOx thickness. 1 nm thick TiOx with Yb/Ag stack on 8 nm thick i-a-Si:H achieves the minimum c of 48 mΩ·cm2 and a J0,metal below 15 fA/cm2.
Intrinsic Exponential Decay of Mass-Energy as Common Source Underlying Fast Radio Bursts and Cosmic Expansion
Creators: name: Brown, Benjamin Reed
name: Anthropic AI Assistant
Publisher: name: Zenodo
Year: 2023
Subjects: Astrophysics
Physics
Quantum Mechanics

description: This study proposed intrinsic universal exponential mass-energy decay as a candidate source phenomenon driving both apparent cosmic accelerative expansion and extra-galactic fast radio bursts originating from compact objects like highly magnetized neutron stars.
Functional Characteristics of Gene Expression Motifs with Single and Dual Strategies of Regulation
Creators: name: Pal, Mainak
name: Ghosh, Sayantari
name: Bose, Indrani
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cell Behavior (q-bio.CB)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: Transcriptional regulation by transcription factors and post-transcriptional regulation by microRNAs constitute two major modes of regulation of gene expression. While gene expression motifs incorporating solely transcriptional regulation are well investigated, the dynamics of motifs with dual strategies of regulation, i.e., both transcriptional and post-transcriptional regulation, have not been studied as extensively. In this paper, we probe the dynamics of a four-gene motif with dual strategies of regulation of gene expression. Some of the functional characteristics are compared with those of a two-gene motif, the genetic toggle, employing only transcriptional regulation. Both the motifs define positive feedback loops with the potential for bistability and hysteresis. The four-gene motif, contrary to the genetic toggle, is found to exhibit bistability even in the absence of cooperativity in the regulation of gene expression. The four-gene motif further exhibits a novel dynamical feature in which two regions of monostability with linear threshold response are separated by a region of bistability with digital response. Using the linear noise approximation (LNA), we further show that the coefficient of variation (a measure of noise), associated with the protein levels in the steady state, has a lower magnitude in the case of the four-gene motif as compared to the case of the genetic toggle. We next compare transcriptional with post-transcriptional regulation from an information theoretic perspective. We focus on two gene expression motifs, Motif 1 with transcriptional regulation and Motif 2 with post-transcriptional regulation. We show that amongst the two motifs, Motif 2 has a greater capacity for information transmission for an extended range of parameter values.
Novel Prosopis juliflora leaf ethanolic extract as natural antimicrobial agent against food spoiling microorganisms
Creators: name: Saleh, Iman
name: Abu-Dieyeh, Mohammed H.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Microbiology
subject: FOS: Biological sciences

description: Fresh produces spoilage is a worldwide concern that accompany the global increase in food demand. Adverse human health and environmental effects of commercial spoilage control agents are major public concern. In this study, Prosopis juliflora leaves and fruit extracts had their antimicrobial activities evaluated against the growth of selected bacteria and yeast, and against mycelial growth and conidial germination of selected mycotoxins-producing fungi. P. juliflora water-soluble leaf ethanolic (PJ-WS-LE) extract with its novel extraction method showed the strongest antibacterial activity. Antimicrobial tests showed total inhibition of Botrytis cinerea, Alternaria alternata, Bacillus subtilis, Staphylococcus aureus and Candida albicans with MICs ranging between 0.125 and 1 mg/ml. Percent inhibition of mycelial growth (PIMG) of the extract was also determined against seven other fungal strains with highest value against Geotrichum candidum (66.2%). Even the least affected fungal strain showed alterations in their hyphae and spores exposed to PJ-WS-LE extract when observed using scanning electron microscope (SEM), alterations include exfoliated flakes, pores, vacuolation and applanation. Small-scale fruit bioassays controlled experiment showed high efficacy of the extract in protecting inoculated cherry tomato samples from B. cinerea and A. alternata infections. In conclusion, PJ-WS-LE extract is a feasible, natural antifungal agent that can replace common anti-spoiling chemicals.Other Information Published in: Scientific Reports
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1038/s41598-021-86509-3
Progress on Bifacial Ni/Ag Plated nPERT Cells for Module Fabrication with SWCT
Creators: name: Tous, L.
name: Russell, R.
name: Yao, Y.
name: Bonnet-Eymard, B.
name: Jambaldinni, S.
name: Van Der Heide, A.
name: Doumen, G.
name: Duerinckx, F.
name: Voroshazi, E.
name: Szlufcik, J.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Heterojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 439-443
description: In this work, we report on progress made when using busbarless (0BB) bifacial Ni/Ag plated n-type Czochralski-grown (Cz) Passivated Emitter, Rear Totally diffused (nPERT) cells and Smart Wire Contacting Technology (SWCT) for interconnection. We show that Ni/Ag glass-glass (GG) SWCT laminates with an adapted laser pattern display a limited average power loss of 1.7±0.0 %rel. after 600 thermal cycles (TC) between -40 °C to +85 °C. Using this adapted laser pattern, we made a 60-cell GG SWCT module from a new batch of 0BB Ni/Ag nPERT cells using automated stringing equipment at Meyer Burger facilities. For this module, we measured a maximum power of 296.9 Wp under standard test conditions with a good cell-to-module ratio of 1.01. In addition, we also measured BiFi100 and BiFi200 values of 327.6 Wp and 356.7 Wp respectively. These results show the high potential of SWCT GG modules with 0BB Ni/Ag nPERT cells.
Nanocrystalline n-Type Silicon Front Surface Field Layers: From Research to Industry Applications in Silicon Heterojunction Solar Cells
Creators: name: Morales-Vilches, A.B.
name: Decker, D.
name: Mazzarella, L.
name: Korte, L.
name: Schlatmann, R.
name: Sontag, D.
name: Stannowski, B.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Homojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 422-425
description: Nanocrystalline silicon and silicon oxide (nc-Si(Ox):H) layers grown by plasma-enhanced chemical vapor deposition (PECVD) have shown low parasitic absorption and excellent contact properties when implemented as n-type front surface field (FSF) contact in rear-junction silicon heterojunction (SHJ) solar cells [1-3]. In this contribution we present results from the successful process transfer from the lab at PVcomB at the Helmholtz-Zentrum Berlin (HZB), to the industrial pilot line at Meyer Burger Germany GmbH (MBG). Conversion efficiencies  > 22.5 % were demonstrated on SHJ cell (4 cm2) [2, 3]. The excellent cell performance in the lab and the potential to reduce parasitic absorption in the front stack by using nc-SiOx:H motivated the process transfer from HZB to MBG. Initial cross processing experiments on 244 cm² wafers showed the benefit of using nc-Si:H as FSF layer. We here also emphasize the role of the Si texture on a fast nc-Si:H nucleation. After cross processing experiments a successful transfer of the nc-Si:H process and fine tuning resulted in a median cell efficiency of 23.4 %. This is in the same range as the MGB reference on 244 cm² cells, noteworthy, at the same throughput. Currently work is ongoing to further improve the optical performance of the cells by adding oxygen (CO2).
Wüstenberg, Ralf K. (Hrsg.): Wahrheit, Recht und Versöhnung
Creators: name: Nietzke, Markus
Publisher: name: Lutherische Beiträge
Year: 1970

description: Lutherische Beiträge, Bd. 7 Nr. 2 (2002): Lutherische Beiträge, Band 7, Heft 2
Silicon Heterojunction Solar Cells with Open-Circuit-Voltage above 750mV
Creators: name: Danel, A.
name: Harrison, S.
name: Gérenton, F.
name: Moustafa, A.
name: Varache, R.
name: Veirman, J.
name: Roux, C.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Heterojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 444-447
description: In this paper we present silicon heterojunction (SHJ) cells with Voc beyond 750mV fabricated on thin
wafers on a semi-industrial pilot line. Once critical parameters for SHJ cell are insured, such as very high quality n-Cz
material (2 Ohm.cm – 8ms typically), good wet cleaning along with right queue-time conditions, good PECVD a-Si:H
passivation (Seff <2 cm/s typically) and limited damage induced during ITO deposition and screen printing, the recipe
development is not a first order work. The most important point is to insure cell processing below 90μm without extra
defectivity. This was done in this work thanks to specific know how and practical adjustment of automation, handling,
logistics of thin cells (40 to 90μm free standing 156x156 mm2 wafers). The best Voc of this work is 752mV and 751mV
independently measured by ISFH-CalTeC on total area 244.3 cm2 (M2 size), bifacial, rear emitter, 4 busbar cells.
Accordingly, <1 g Si/Wp was acheived with a record at 0.52 g Si/Wp for a 44μm cell. Very promising implied Voc up
to 765mV on cell precursors post PECVD and losses analysis show possible cell Voc >755mV and a <0.5 g Si/Wp
figure of merite short term.
Steiger, Johann Anselm (hg. in Verbindung mit R.G. Bogner und A. Bitzel): JOHANN GERHARD
Creators: name: Junker, Thomas
Publisher: name: Lutherische Beiträge
Year: 1970

description: Lutherische Beiträge, Bd. 7 Nr. 2 (2002): Lutherische Beiträge, Band 7, Heft 2
Development of 4 nm-Thin PECVD Aluminium Oxide Using Plasma Analysis and Its Application to PERC Solar Cells and Modules
Creators: name: Hofmann, M.
name: Wagenmann, D.
name: Teßmann, C.
name: Jäcklein, M.
name: Saint-Cast, P.
name: Eberlein, D.
name: Kraft, A.
name: Dippell, T.
name: May, F.
name: Dörr, M.
name: Cord, B.
name: Schütte, T.
name: Neiß, P.
name: Eichhorn, L.
name: Klick, M.
name: Richter, U.
name: Siemers, M.
name: Wiedemuth, P.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Homojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 385-389
description: Very thin aluminum oxide passivation films (3.7 nm) are developed using ICP PECVD and applying plasma simulation (particle-in-cell Monte Carlo method), in-situ plasma characterization (spectroscopic plasma monitoring, self-excited electron plasma resonance spectroscopy, laser ellipsometry) and ex-situ layer analysis (lifetime and density of interface traps investigation). The thin (3.7 nm) AlOx films are applied to PERC-type solar cells reaching 21% efficiency slightly outperforming solar cells applying standard 15 nm AlOx layers. All solar modules manufactured applying the 3.7 nm thin AlOx passivation layer successfully passed standard damp-heat and thermal-cycling tests proving the applicability of the novel technology.
Analytic approach for reflected Brownian motion in the quadrant
Creators: name: Franceschi, Sandro
name: Kourkova, Irina
name: Raschel, Kilian
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J65, 30E20, 60J70, 60K25, 30E25, 60F17, 30D05, 30F10

description: Random walks in the quarter plane are an important object both of combinatorics and probability theory. Of particular interest for their study, there is an analytic approach initiated by Fayolle, Iasnogorodski and Malyshev, and further developed by the last two authors of this note. The outcomes of this method are explicit expressions for the generating functions of interest, asymptotic analysis of their coefficients, etc. Although there is an important literature on reflected Brownian motion in the quarter plane (the continuous counterpart of quadrant random walks), an analogue of the analytic approach has not been fully developed to that context. The aim of this note is twofold: it is first an extended abstract of two recent articles of the authors of this paper, which propose such an approach; we further compare various aspects of the discrete and continuous analytic approaches.
description: 19 pages, 5 figures. Extended abstract of the papers arXiv:1602.03054 and arXiv:1604.02918, to appear in Proceedings of the 27th International Conference on Probabilistic, Combinatorial and Asymptotic Methods for the Analysis of Algorithms, Krakow, Poland, 4-8 July 2016 arXiv admin note: text overlap with arXiv:1602.03054
Monitoring oil spill in Norilsk, Russia using satellite data
Creators: name: Rajendran, Sankaran
name: Sadooni, Fadhil N.
name: Al-Kuwari, Hamad Al-Saad
name: Oleg, Anisimov
name: Govil, Himanshu
name: Nasir, Sobhi
name: Vethamony, Ponnumony
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Environmental engineering
subject: FOS: Environmental engineering

description: This paper studies the oil spill, which occurred in the Norilsk and Taimyr region of Russia due to the collapse of the fuel tank at the power station on May 29, 2020. We monitored the snow, ice, water, vegetation and wetland of the region using data from the Multi-Spectral Instruments (MSI) of Sentinel-2 satellite. We analyzed the spectral band absorptions of Sentinel-2 data acquired before, during and after the incident, developed true and false-color composites (FCC), decorrelated spectral bands and used the indices, i.e. Snow Water Index (SWI), Normalized Difference Water Index (NDWI) and Normalized Difference Vegetation Index (NDVI). The results of decorrelated spectral bands 3, 8, and 11 of Sentinel-2 well confirmed the results of SWI, NDWI, NDVI, and FCC images showing the intensive snow and ice melt between May 21 and 31, 2020. We used Sentinel-2 results, field photographs, analysis of the 1980–2020 daily air temperature and precipitation data, permafrost observations and modeling to explore the hypothesis that either the long-term dynamics of the frozen ground, changing climate and environmental factors, or abnormal weather conditions may have caused or contributed to the collapse of the oil tank.Other Information Published in: Scientific Reports
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1038/s41598-021-83260-7
Well Passivating and Highly Temperature Stable Aluminum Oxide Deposited by Atmospheric Pressure Chemical Vapor Deposition for PERC and PERT Solar Cell Concepts
Creators: name: Engelhardt, J.
name: Gapp, B.
name: Mutter, F.
name: Hahn, G.
name: Terheiden, B.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Homojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 390-394
description: Atmospheric pressure chemical vapor deposited aluminum oxide films based on trimethyl-aluminum and
oxygen as precursors reaching a surface passivation quality comparable to atomic layer deposited aluminum oxide
layers are presented. Demonstrated are charge carrier lifetime values up to 8 ms on n-type Cz-Si for fired AlOx/SiNx:H
passivation stacks, common to PERC and PERT solar cell designs. The APCVD AlOx layers are highly temperature
stable for set peak firing temperatures in the range of 700-920°C allowing for surface recombination velocities < 2 cms-
1. The influence of temperature during AlOx deposition in the APCVD tool is investigated concerning Si material and
fundamental passivation effect properties. The latter are investigated in comparison to ALD AlOx determining the
underlying causes for higher lifetime after firing for APCVD AlOx films.
Bifacial pSPEER Solar Cells for Shingle Modules
Creators: name: Baliozian, P.
name: Fellmeth, T.
name: Wöhrle, N.
name: Lohmüller, E.
name: Preu, R.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Manufacturing & Production of Si Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 410-413
description: Shingling bifacial solar cells leads to higher output power densities pout of silicon-based photovoltaic modules. This paper provides a short update on the current developments at Fraunhofer ISE in Czochralski-grown silicon bifacial “p-type shingled passivated edge, emitter, and rear (pSPEER)” solar cells. In the batch presented in this work, conventionally separated pSPEER cells are fabricated. Illuminated current-voltage measurements of the most efficient pSPEER cell results in a designated front side energy conversion efficiency of f = 21.4% for an irradiance Gf = 1000 W/m2. The pSPEER cells show similar front side efficiencies independent of the pre-separation position within the 6-inch host wafer. Considering an additional rear side irradiance of Gr = 100 W/m2, the most efficient pSPEER cell attains a total designated output power density pout = 22.8 mW/cm2.
Virome-wide serological profiling reveals association of herpesviruses with obesity
Creators: name: Hasan, Mohammad Rubayet
name: Rahman, Mahbuba
name: Khan, Taushif
name: Saeed, Amira
name: Sundararaju, Sathyavathi
name: Flores, Annaliza
name: Hawken, Phillip
name: Rawat, Arun
name: Elkum, Naser
name: Hussain, Khalid
name: Tan, Rusung
name: Tang, Patrick
name: Marr, Nico
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Medical microbiology

description: The relationship between viral infection and obesity has been known for several decades but epidemiological data is limited to only a few viral pathogens. The association between obesity and a wide range of viruses was assessed using VirScan, a pan-viral serological profiling tool. Serum specimens from 457 Qatari adults (lean = 184; obese = 273) and 231 Qatari children (lean = 111; obese = 120) were analyzed by VirScan. Associations with obesity were determined by odds ratio (OR) and Fisher’s test (p values), and by multivariate regression analysis to adjust for age and gender. Although there was no association of viral infections with obesity in the pediatric population, a nominal association of obesity with seropositivity to members of the Herpesviridae family is observed for the adult population (OR = 1.5–3.3; p < 0.05). After adjusting p values for multiple comparisons (Bonferroni correction) the odds of being obese is significantly higher in herpes simplex virus 1 (HSV-1) seropositive Qatari adults (OR = 3.3; 95% CI 2.15–4.99; p = 2.787E − 08). By VirScan, the sero-prevalence of HSV1 is 81.3% and 57.1% among Qatari obese and lean adult populations, respectively. Higher prevalence of antibodies against several peptide epitopes of HSV-1/2 is positively associated with obesity (OR = 2.35–3.82; p ≤ 3.981E − 05). By multivariate regression analysis, HSV-1 was independently associated with obesity irrespective of age and gender. Our results suggest that obesity among Qataris may be associated with a higher prevalence of herpesvirus infections, in particular HSV-1. Furthermore, the high prevalence of antibodies against peptide antigens specific to HSV-1 and -2 in the obese population suggests that these viral peptides may play a role in adipogenesis. Further studies with these candidate peptides in cell culture or animal models may confirm their adipogenic roles.Other Information Published in: Scientific Reports
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1038/s41598-021-82213-4
The carboxy terminal coiled-coil modulates Orai1 internalization during meiosis
Creators: name: Hodeify, Rawad
name: Dib, Maya
name: Alcantara-Adap, Ethel
name: Courjaret, Raphael
name: Nader, Nancy
name: Reyes, Cleo Z.
name: Hammad, Ayat S.
name: Hubrack, Satanay
name: Yu, Fang
name: Machaca, Khaled
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Medical biochemistry and metabolomics

description: Regulation of Ca2+ signaling is critical for the progression of cell division, especially during meiosis to prepare the egg for fertilization. The primary Ca2+ influx pathway in oocytes is Store-Operated Ca2+ Entry (SOCE). SOCE is tightly regulated during meiosis, including internalization of the SOCE channel, Orai1. Orai1 is a four-pass membrane protein with cytosolic N- and C-termini. Orai1 internalization requires a caveolin binding motif (CBM) in the N-terminus as well as the C-terminal cytosolic domain. However, the molecular determinant for Orai1 endocytosis in the C-terminus are not known. Here we show that the Orai1 C-terminus modulates Orai1 endocytosis during meiosis through a structural motif that is based on the strength of the C-terminal intersubunit coiled coil (CC) domains. Deletion mutants show that a minimal C-terminal sequence after transmembrane domain 4 (residues 260–275) supports Orai1 internalization. We refer to this region as the C-terminus Internalization Handle (CIH). Access to CIH however is dependent on the strength of the intersubunit CC. Mutants that increase the stability of the coiled coil prevent internalization independent of specific mutation. We further used human and Xenopus Orai isoforms with different propensity to form C-terminal CC and show a strong correlation between the strength of the CC and Orai internalization. Furthermore, Orai1 internalization does not depend on clathrin, flotillin or PIP2. Collectively these results argue that Orai1 internalization requires both the N-terminal CBM and C-terminal CIH where access to CIH is controlled by the strength of intersubunit C-terminal CC.Other Information Published in: Scientific Reports
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1038/s41598-021-82048-z
Selective Emitter Using APCVD PSG Layers as Doping Source
Creators: name: Saint-Cast, P.
name: Belledin, U.
name: Lohmüller, E.
name: Kafle, B.
name: Weber, J.
name: Seren, S.
name: Lohmüller, S.
name: Wolf, A.
name: Hofmann, M.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Homojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 371-374
description: Using atmospheric pressure chemical vapour deposition (APCVD) of phosphosilicate glass (PSG)
allows the separation of the PSG deposition and the thermal drive-in, adding another degree of freedom and control to
the emitter formation. A large survey is carried out varying the process parameters such as phosphorus concentration
and layer thickness of the PSG layer and the temperature and duration of the thermal drive-in in a tube furnace. We
show that the data of the survey can train a metamodel, which can predict the emitter sheet resistances Rsh based on
the process parameters. An emitter with Rsh = 120 /sq and an emitter dark saturation current density j0e = 40 fA/cm²
after firing (textured surface, SiNX passivation) is demonstrated using this approach. For the formation of a selective
emitter, laser diffusion is carried out. The laser process takes place between the PSG layer deposition and the drive-in
process. A 1.4 μm deep profile with a peak concentration of 7×1019 cm-3 at the surface is fabricated using a longpulse
infrared laser. This process leads to a specific contact resistivity C = 4.2 mcm² using a commercially
available screen-printed and fired silver paste. Specific contact resistivity down to C = 1 mcm² is reached using a
short-pulse green laser process.
Classification results on surfaces in the isotropic 3-space
Creators: name: Aydin, Muhittin Evren
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53A35, 53A40, 53B25

description: The isotropic 3-space I^3 which is one of the Cayley--Klein spaces is obtained from the Euclidean space by substituting the usual Euclidean distance with the isotropic distance. In the present paper, we give several classifications on the surfaces in I^3 with the constant relative curvature (analogue of the Gaussian curvature) and the constant isotropic mean curvature. In particular, we classify the helicoidal surfaces in I^3 with constant curvature and analyze some special curves on these.
description: 12 pages, 2 figures
Defects in Epitaxially Grown Silicon Wafers Causing Lifetime Patterns
Creators: name: Drießen, M.
name: Beu, P.
name: Heinz, F.D.
name: Fehrenbach, T.
name: Gust, E.
name: Schindler, F.
name: Janz, S.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 350-353
description: Epitaxially grown silicon wafers (EpiWafers) have the potential of gaining high electrical quality while production costs can be significantly reduced compared to conventional wafers. High efficiencies are already reported for solar cells made of EpiWafers yet defects originating from the specific production sequence are limiting their quality. Photoluminescence imaging shows line patterns of high recombination activity. A further reduced lifetime is visible in square shaped features often positioned at crossing points of the lines. Those features correspond mainly to stacking faults with polycrystalline inclusions, similar square shaped features beside lines to regular stacking faults. Micro photoluminescence measurements reveal that the lines consist of agglomerations of spots with high recombination activity. In the areas with those spots threading dislocations can be found on defect etched samples in a number exceeding the number of spots. We explain all observations by dislocation mediated impurity aggregation and precipitation.
Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
Creators: name: Selig, Malte
name: Berghäuser, Gunnar
name: Raja, Archana
name: Nagler, Philipp
name: Schüller, Christian
name: Heinz, Tony F.
name: Korn, Tobias
name: Chernikov, Alexey
name: Malic, Ermin
name: Knorr, Andreas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Atomically thin transition metal dichalcogenides (TMDs) are direct-gap semiconductors with strong light-matter and Coulomb interaction. The latter accounts for tightly bound excitons, which dominate the optical properties of these technologically promising materials. Besides the optically accessible bright excitons, these systems exhibit a variety of dark excitonic states. They are not visible in optical spectra, but can strongly influence the coherence lifetime and the linewidth of the emission from bright exciton states. In a recent study, an experimental evidence for the existence of such dark states has been demonstrated, as well as their strong impact on the quantum efficiency of light emission in TMDs. Here, we reveal the microscopic origin of the excitonic coherence lifetime in two representative TMD materials (WS$_2$ and MoSe$_2$) within a joint study combining microscopic theory with optical experiments. We show that the excitonic coherence lifetime is determined by phonon-induced intra- and intervalley scattering into dark excitonic states. Remarkably, and in accordance with the theoretical prediction, we find an efficient exciton relaxation in WS$_2$ through phonon emission at all temperatures.
A genome-wide transcriptomic analysis of embryos fathered by obese males in a murine model of diet-induced obesity
Creators: name: Bernhardt, Laura
name: Dittrich, Marcus
name: El-Merahbi, Rabih
name: Saliba, Antoine-Emmanuel
name: Müller, Tobias
name: Sumara, Grzegorz
name: Vogel, Jörg
name: Nichols-Burns, Stefanie
name: Mitchell, Megan
name: Haaf, Thomas
name: El Hajj, Nady
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Paternal obesity is known to have a negative impact on the male’s reproductive health as well as the health of his offspring. Although epigenetic mechanisms have been implicated in the non-genetic transmission of acquired traits, the effect of paternal obesity on gene expression in the preimplantation embryo has not been fully studied. To this end, we investigated whether paternal obesity is associated with gene expression changes in eight-cell stage embryos fathered by males on a high-fat diet. We used single embryo RNA-seq to compare the gene expression profile of embryos generated by males on a high fat (HFD) versus control (CD) diet. This analysis revealed significant upregulation of the Samd4b and Gata6 gene in embryos in response to a paternal HFD. Furthermore, we could show a significant increase in expression of both Gata6 and Samd4b during differentiation of stromal vascular cells into mature adipocytes. These findings suggest that paternal obesity may induce changes in the male germ cells which are associated with the gene expression changes in the resulting preimplantation embryos.Other Information Published in: Scientific Reports
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1038/s41598-021-81226-3
New class of hybrid EoS and Bayesian M-R data analysis
Creators: name: Alvarez-Castillo, D.
name: Ayriyan, A.
name: Benic, S.
name: Blaschke, D.
name: Grigorian, H.
name: Typel, S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We explore systematically a new class of two-phase equations of state (EoS) for hybrid stars that is characterized by three main features : (1) stiffening of the nuclear EoS at supersaturation densities due to quark exchange effects (Pauli blocking) between hadrons, modelled by an excluded volume correction, (2) stiffening of the quark matter EoS at high densities due to multiquark interactions and (3) possibility for a strong first order phase transition with an early onset and large density jump. The third feature results from a Maxwell construction for the possible transition from the nuclear to a quark matter phase and its properties depend on the two parameters used for (1) and (2), respectively. Varying these two parameters one obtains a class of hybrid EoS that yields solutions of the Tolman-Oppenheimer-Volkoff (TOV) equations for sequences of hadronic and hybrid stars in the mass-radius diagram which cover the full range of patterns according to the Alford-Han-Prakash classification following which a hybrid star branch can be either absent, connected or disconnected with the hadronic one. The latter case often includes a tiny connected branch. The disconnected hybrid star branch, also called "third family", corresponds to high-mass twin stars characterized by the same gravitational mass but different radii. We perform a Bayesian analysis and demonstrate that the observation of such a pair of high-mass twin stars would have a sufficient discriminating power to favor hybrid EoS with a strong first order phase transition over alternative EoS.
description: 11 pages, 6 figures, to appear in the EPJA Topical Issue on "Exotic Matter in Neutron Stars"
Laser-Doped Selective Emitter - Process Development and Speed-Up
Creators: name: Weber, J.
name: Gutscher, S.
name: Lohmüller, S.
name: Lohmüller, E.
name: Brand, A.A.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Homojunction Solar Cells

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 379-384
description: This study pursues the development of a laser-doped selective emitter (LDSE) for p-type silicon
passivated emitter and rear solar cells with screen-printed and fired silver contacts on the front. The LDSE is formed
via local laser doping from the two-layer stack system of phosphosilicate glass and silicon dioxide that is located on
the wafer surface after tube furnace diffusion using phosphorus oxychloride (POCl3) as liquid dopant precursor. We
aim for minimum emitter dark saturation current density at the LDSE-metal interface j0e,met and minimum specific
contact resistance c. We use both an atmospheric pressure POCl3 diffusion process and a high throughput low
pressure POCl3 diffusion process. Both POCl3 processes are combined with a green nanosecond laser process at
wavelength  = 532 nm and pulse repetition rates 60 kHz ≤ frep ≤ 100 kHz. Furthermore, we investigate high-speed
infrared laser processes at  = 1064 nm and frep = 2 MHz for which heat accumulation is expected to become relevant
during LDSE formation. For some of the tested laser processes within this work, c ≈ 1 mΩcm2 is achieved. At the
same time, simulations with the Quokka3 skin solver that are based on the LDSE doping profiles show that the
LDSEs have the potential to lead to a j0e,met reduction by more than 50% compared to the not laser-doped emitter.
A novel CO2 utilization technology for the synergistic co-production of multi-walled carbon nanotubes and syngas
Creators: name: Challiwala, Mohamed S.
name: Choudhury, Hanif A.
name: Wang, Dingdi
name: El-Halwagi, Mahmoud M.
name: Weitz, Eric
name: Elbashir, Nimir O.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Nanotechnology
subject: FOS: Nanotechnology

description: Dry reforming of methane (DRM) is a well-known process in which CH4 and CO2 catalytically react to produce syngas. Solid carbon is a well-known byproduct of the DRM but is undesirable as it leads to catalyst deactivation. However, converting CO2 and CH4 into solid carbon serves as a promising carbon capture and sequestration technique that has been demonstrated in this study by two patented processes. In the first process, known as CARGEN technology (CARbon GENerator), a novel concept of two reactors in series is developed that separately convert the greenhouse gases (GHGs) into multi-walled carbon nanotubes (MWCNTs) and syngas. CARGEN enables at least a 50% reduction in energy requirement with at least 65% CO2 conversion compared to the DRM process. The second process presents an alternative pathway for the regeneration/reactivation of the spent DRM/CARGEN catalyst using CO2. Provided herein is the first report on an experimental demonstration of a 'switching' technology in which CO2 is utilized in both the operation and the regeneration cycles and thus, finally contributing to the overall goal of CO2 fixation. The following studies support all the results in this work: physisorption, chemisorption, XRD, XPS, SEM, TEM, TGA, ICP, and Raman analysis.Other Information Published in: Scientific Reports
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1038/s41598-021-80986-2
On Sparsity by NUV-EM, Gaussian Message Passing, and Kalman Smoothing
Creators: name: Loeliger, Hans-Andrea
name: Bruderer, Lukas
name: Malmberg, Hampus
name: Wadehn, Federico
name: Zalmai, Nour
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Normal priors with unknown variance (NUV) have long been known to promote sparsity and to blend well with parameter learning by expectation maximization (EM). In this paper, we advocate this approach for linear state space models for applications such as the estimation of impulsive signals, the detection of localized events, smoothing with occasional jumps in the state space, and the detection and removal of outliers. The actual computations boil down to multivariate-Gaussian message passing algorithms that are closely related to Kalman smoothing. We give improved tables of Gaussian-message computations from which such algorithms are easily synthesized, and we point out two preferred such algorithms.
Metal Contamination in the Diamond Wire Sawing Process of Silicon and Influence on the Solar Cell Efficiency
Creators: name: Kaden, T.
name: Lottspeich, L.
Publisher: name: WIP
Year: 2018
Subjects: Silicon Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 35th European Photovoltaic Solar Energy Conference and Exhibition; 326-330
description: In diamond wire sawing (DWS) of silicon wafers a steel core wire is used with diamonds embedded in a particular coating layer. This layer is either a nickel-based metallic layer or a resin-based layer. Due to the different properties of the layer material, the density of diamonds on the wire and the wire wear during the sawing process differ strongly between these two types of wire coatings. It was investigated, how the different coatings affect the metal contamination of monocrystalline silicon wafers produced in diamond wire sawing processes. The process parameters were chosen to obtain the same silicon contact length, which is a measure of the wire wear, for both types of wires. A rigorous analysis of the wires and the wafers with respect to the metal contamination was done. For Ni-coated wires, sum concentrations of Ni and Co in the range of 1016 at/cm³ were obtained in layers up to 12 μm below the wafer surface. For resin coated this concentration was significantly lower. PERC solar cells were fabricated from these wafers and the conversion efficiencies are compared.
Mapping and accuracy assessment of siltation of recharge dams using remote sensing technique
Creators: name: Rajendran, Sankaran
name: Nasir, Sobhi
name: Jabri, Khalifa Al
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Environmental engineering
subject: FOS: Environmental engineering

description: This study demonstrates the use of ASTER data to map the siltation of the Al-Khod Dam constructed at the lower reaches of Samail Catchment area, north Muscat, Sultanate of Oman. In this study, the decorrelated image of spectral bands 6, 3, and 1 clearly discriminated the distribution of siltation. The occurrence of siltation is confirmed by the detection of minerals using the VNIR-SWIR bands by the Spectral Angle Mapper (SAM) method. In addition, the siltation of the dam is studied for the years 1987 to 2018 using Landsat satellite images. Interpretation of images showed a gradual increase of the siltation. Mapping accuracy for the occurrence of siltation is assessed by a confusion matrix which produced an overall accuracy of 97.88% and Kappa coefficient of 0.98 in the Maximum Likelihood method. Results of image analyses are verified in the field and confirmed through laboratory analyses. The study of spectral absorption characters of field samples using a Portable Infrared Mineral Analyzer (PIMA) showed the presence of OH molecule bearing minerals (clays, serpentines, etc.) and carbonate minerals (calcite and dolomite) in the silt deposits. The occurrence of these minerals is confirmed further by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) analyses.Other Information Published in: Scientific Reports
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1038/s41598-020-67137-9