cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Novel ORAI1 Mutation Disrupts Channel Trafficking Resulting in Combined Immunodeficiency
Creators: name: Yu, Fang
name: Agrebi, Nourhen
name: Mackeh, Rafah
name: Abouhazima, Khaled
name: KhudaBakhsh, Khadija
name: Adeli, Mehdi
name: Lo, Bernice
name: Hassan, Amel
name: Machaca, Khaled
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Immunology
subject: FOS: Clinical medicine

description: Store-operated Ca2+ entry (SOCE) represents a predominant Ca2+ influx pathway in non-excitable cells. SOCE is required for immune cell activation and is mediated by the plasma membrane (PM) channel ORAI1 and the endoplasmic reticulum (ER) Ca2+ sensor STIM1. Mutations in the Orai1 or STIM1 genes abolish SOCE leading to combined immunodeficiency (CID), muscular hypotonia, and anhidrotic ectodermal dysplasia. Here, we identify a novel autosomal recessive mutation in ORAI1 in a child with CID. The patient is homozygous for p.C126R mutation in the second transmembrane domain (TM2) of ORAI1, a region with no previous loss-of-function mutations. SOCE is suppressed in the patient’s lymphocytes, which is associated with impaired T cell proliferation and cytokine production. Functional analyses demonstrate that the p.C126R mutation does not alter protein expression but disrupts ORAI1 trafficking. Orai1-C126R does not insert properly into the bilayer resulting in ER retention. Insertion of an Arg on the opposite face of TM2 (L135R) also results in defective folding and trafficking. We conclude that positive side chains within ORAI1 TM2 are not tolerated and result in misfolding, defective bilayer insertion, and channel trafficking thus abolishing SOCE and resulting in CID.Other Information Published in: Journal of Clinical Immunology
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10875-021-01004-8
Measurement of the Temperature Profile in mc-Si Ingot During Solidification
Creators: name: Juel, M.
name: Øvrelid, E.J.
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; 1325-1329
description: The temperature profile as function of time gives valuable information of the formation condition of a multi-crystalline Si ingot. Normally such temperature profiles are measured in the pedestal underneath the crucible. This gives only limited information of the temperature variation inside the silicon ingot during solidification. In this work the temperature is therefore measured at different position inside the Si ingot. This was done by placing five thermocouples inside the crucible with a distance of 0, 30, 60, 60, and 90 mm from the bottom. The temperature profiles from the different positions were used to measure the actual starting point of the solidification, the degree of undercooling at the starting point and changes in the crystallisation rate as a function of solidification length. The position of the solidification front measured by the thermocouples was also compared to a one dimensional solidification model.
Differential experiences of prospective medical school applicants from a widening participation background attending the student-led Medic Insight Glasgow events
Creators: name: McQuillan, Erin
name: Bailey, Emma
name: Horsburgh, Lauren
name: Boyd, Marcus
name: Glendell, Rebecca
name: McPherson, Jodie
name: Docherty, Mairi
name: Gallagher, Anna
name: Coltart, Rebecca
name: Alekh Thapa
Publisher: name: F1000 Research Limited
Year: 2023

description: Medic Insight Glasgow is a medical-student led organisation providing events for prospective medical students and promoting widening participation (WP). Large disparities exist within medical school recruitment. Pre-medical school application and career advice is one source of inequity that we try to address within our programmes.
Cross-Validation of the Arabic Mini International Neuropsychiatric Interview, Module K, for Diagnosis of Schizophrenia and the Arabic Positive and Negative Syndrome Scale
Creators: name: Chamali, Rifka
name: Ghuloum, Suhaila
name: Sheehan, David V.
name: Mahfoud, Ziyad
name: Yehya, Arij
name: Opler, Mark G. A.
name: Khan, Anzalee
name: Hammoudeh, Samer
name: Hani, Yahya
name: Al-Amin, Hassen
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Clinical and health psychology

description: The Mini International Neuropsychiatric Interview, version 6, module K (MINI6-Mod-K) is a diagnostic tool to confirm schizophrenia; whereas the Positive and Negative Syndrome Scale in Schizophrenia (PANSS) is a scale to assess psychotic symptoms severity. The objective of this study was to cross-validate the diagnostic questions (categorical) from the Arabic MINI6-Mod-K with the corresponding items’ scores (dimensional) from Arabic PANSS. Arab subjects (N = 101) were recruited from the Psychiatry Hospital in Qatar. MINI6-Mod-K was used to confirm schizophrenia diagnosis, and PANSS was administered to assess psychopathology by an independent rater. The most common symptoms according to MINI6-Mod-K were the delusions and hallucinations but the PANSS items scores ≥2.5 captured more positive responses on all the diagnostic features of schizophrenia. The cut-off PANSS scores that significantly distinguished between the presence or absence of schizophrenia features on MINI6-Mod-K were mostly between 2.5 and 3.5. Multivariate linear regression showed that negative symptoms and disorganized/catatonic behaviors independently contributed to the PANSS score on positive symptoms subscale. However, none of the symptom questions in the MINI6-Mod-K were significant predictors of the PANSS negative score. Our results showed that there is very good cross-validation between the diagnostic questions of Arabic MINI6-Mod-K and the corresponding positive cut-off scores in Arabic PANSS.Other Information Published in: Journal of Psychopathology and Behavioral Assessment
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10862-019-09759-6
Large Scale Hybrid PV Hydro Electricity Production in Floating Devices on Water - Innovative Approach to Accellerate the Impact of PV in Worldwide Power Production
Creators: name: Nordmann, T.
name: Vontobel, T.
name: Clavadetscher, L.
name: Boström, T.
name: Remlo, H.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; 4189-4192
description: The combination of PV and hydro power opens up new potential in photovoltaic power generation. The
hydro electric reservoir can be the platform and the storage for a grid-connected PV plant. In this paper, a scenario and
a case study for such a PV system in Switzerland is discussed. In co-operation with a Norwegian specialist team on
arctic research, a floating PV platform will be designed and constructed. Several new aspects of PV power generation
have to be analysed. The goal of this project is to establish a pilot plant in Switzerland and in Norway, to gain further
knowledge and experience in the field of “PV on the Water”.
Percolation of networks with directed dependency links
Creators: name: Niu, Dunbiao
name: Yuan, Xin
name: Du, Minhui
name: Stanley, H. Eugene
name: Hu, Yanqing
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: The self-consistent probabilistic approach has proven itself powerful in studying the percolation behavior of interdependent or multiplex networks without tracking the percolation process through each cascading step. In order to understand how directed dependency links impact criticality, we employ this approach to study the percolation properties of networks with both undirected connectivity links and directed dependency links. We find that when a random network with a given degree distribution undergoes a second-order phase transition, the critical point and the unstable regime surrounding the second-order phase transition regime are determined by the proportion of nodes that do not depend on any other nodes. Moreover, we also find that the triple point and the boundary between first- and second-order transitions are determined by the proportion of nodes that depend on no more than one node. This implies that it is maybe general for multiplex network systems, some important properties of phase transitions can be determined only by a few parameters. We illustrate our findings using Erdos-Renyi (ER) networks.
description: 7 pager 5 figure
“Surviving the on-call” - an analysis of a local trainee-led simulation teaching programme for medical students
Creators: name: Tinaye Mapako
name: Dereham, Alexander
name: Rossi, Nicholas
name: Titi, Adel
Publisher: name: F1000 Research Limited
Year: 2023

description: Background
 Out-of-hours on-call shifts are a common source of apprehension among newly qualified junior doctors. Simulated training within national medical curricula typically focuses on the clinical aspects of managing unwell patients, potentially neglecting important non-clinical skills. A group of doctors at the Royal Lancaster Infirmary designed a 3-part teaching programme for final-year medical students. This focused on improving non-clinical skills through simulation-based teaching, with the overall aim of increasing confidence and preparedness for out-of-hour on-call shifts.
 Summary of Work
 Seventeen students participated in this program. Baseline parameters addressing a range of non-clinical aspects of on-call shifts were assessed using pre-course questionnaires. The parameters included confidence, experience-to-date, organisation/prioritisation skills, understanding of communication systems, and understanding of different team members' roles. These were scored from 0 (lowest) to 10 (highest) on a 10-point Likert scale. The program consisted of a low technology simulated session facilitated by junior doctors in a non-clinical environment. This involved a variety of theoretical clinical scenarios, interceded with mock requests and interruptions, to simulate a real on-call shift. The simulated session was supplemented by two additional lectures. Following the programme’s delivery, students were asked to repeat the questionnaire to assess potential improvements
 Summary of Results
 The teaching program demonstrated widespread improvement across all assessed parameters. Improvements were observed in experience, preparedness, and confidence, with increases in mean self-reported scores of 1.8 – 7.1 (294% improvement), 2.2 – 8.4 (+282%) and 2.6 – 8.0 (+208%), respectively. Job prioritisation [3.4 – 9.0 (+165%)], understanding of team-members’ roles [3.4 – 8.6 (+153%)] and understanding of communication systems (3.3 – 8. 3 (+152%]) also demonstrated a clear improvement. A mean score of 9.5 was reported when asked whether students believed our teaching programme improved their overall confidence and preparedness for on-call.
 Discussion and Conclusion
 We demonstrated that low-technology simulated teaching sessions with a non-clinical focus can produce significant benefits in improving medical students’ overall confidence and preparedness in advance of out-of-hour on-call shifts as junior doctors. We are now discussing the introduction of our sessions to two other NHS Hospital Trusts nationally.
 Take Home Messages
 Medical students’ confidence in approaching an on-call can be improved with a low-fi simulation led by trainees.
Confronting uncertainties in stellar physics II. exploring differences in main-sequence stellar evolution tracks
Creators: name: Stancliffe, R. J.
name: Fossati, L.
name: Passy, J. -C.
name: Schneider, F. R. N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We assess the systematic uncertainties in stellar evolutionary calculations for low- to intermediate-mass, main-sequence stars. We compare published stellar tracks from several different evolution codes with our own tracks computed using the stellar codes STARS and MESA. In particular, we focus on tracks of 1 and 3 solar masses at solar metallicity. We find that the spread in the available 1 solar mass tracks (computed before the recent solar composition revision by Asplund et al.) can be covered by tracks between 0.97-1.01 solar masses computed with the STARS code. We assess some possible causes of the origin of this uncertainty, including how the choice of input physics and the solar constraints used to perform the solar calibration affect the tracks. We find that for a 1 solar mass track, uncertainties of around 10% in the initial hydrogen abundance and initial metallicity produce around a 2% error in mass. For the 3 solar mass tracks, there is very little difference between the tracks from the various different stellar codes. The main difference comes in the extent of the main sequence, which we believe results from the different choices of the implementation of convective overshooting in the core. Uncertainties in the initial abundances lead to a 1-2% error in the mass determination. These uncertainties cover only part of the total error budget, which should also include uncertainties in the input physics (e.g., reaction rates, opacities, convective models) and any missing physics (e.g., radiative levitation, rotation, magnetic fields). Uncertainties in stellar surface properties such as luminosity and effective temperature will further reduce the accuracy of any potential mass determinations.
description: 11 pages, 11 figures. Accepted for publication in A&A
Super-Resolution MIMO Radar
Creators: name: Heckel, Reinhard
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: A multiple input, multiple output (MIMO) radar emits probings signals with multiple transmit antennas and records the reflections from targets with multiple receive antennas. Estimating the relative angles, delays, and Doppler shifts from the received signals allows to determine the locations and velocities of the targets. Standard approaches to MIMO radar based on digital matched filtering or compressed sensing only resolve the angle-delay-Doppler triplets on a $(1/(N_T N_R), 1/B,1/T)$ grid, where $N_T$ and $N_R$ are the number of transmit and receive antennas, $B$ is the bandwidth of the probing signals, and $T$ is the length of the time interval over which the reflections are observed. In this work, we show that the \emph{continuous} angle-delay-Doppler triplets and the corresponding attenuation factors can be recovered perfectly by solving a convex optimization problem. This result holds provided that the angle-delay-Doppler triplets are separated either by $10/(N_T N_R-1)$ in angle, $10.01/B$ in delay, or $10.01/T$ in Doppler direction. Furthermore, this result is optimal (up to log factors) in the number of angle-delay-Doppler triplets that can be recovered.
description: To appear in Proc. of IEEE International Symposium on Information Theory (ISIT), Barcelona, Spain, July 2016. Slightly extended version
Factors associated with non-compliance with the vaccination scheme in Mexican medical students
Creators: name: A.J. García-Rebbollo
name: H.S Macías-Sánchez
name: C.E. Muñoz-Salgado
name: H.M. Moreno-Briones
name: G Baltazar-Escobar
name: I.R Matsumoto-Palomares
name: M Perez Hernandez
name: A.E Gonzalez-Paz
name: I Gómez-Oropeza
name: X. Rodriguez-Bello
Publisher: name: F1000 Research Limited
Year: 2023

description: Vaccination is one of the public health strategies to prevent infectious diseases. Healthcare workers must complete vaccination records due to exposure to infections within healthcare settings. When medical students start their clinical rotations they become a health workforce exposed to multiple infectious agents. Here we evaluate the factors associated with the non-compliance of these vaccination schemes in medical trainees.
Investigation on the Sawing of Solar Silicon by Application of Wires of 100 µm Diameter
Creators: name: Weber, B.
name: Bierwisch, C.
name: Kleer, G.
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; 1285-1288
description: In the wafering process of silicon ingots up to 50% of the silicon is lost due to the sawing process. In order to increase the wafer yield the manufacturers reduced the wafer thickness from 300 μm down to 180 μm in the past years. Developments for achieving reductions of kerf loss by reducing the wire diameter are much less advanced because of the difficulties to keep the actual standards for the wafer properties and the sawing process (e.g. high feed rate). The purpose of this work was to apply thin wires of 100 μm diameter in the sawing process and to analyze influences of different sawing parameters, e.g. distributions of SiC particles as abrasives in slurries and forces effective during sawing on quantities like wire lifetime, wafer roughness, and wafer strength. The sawing experiments were performed by application of an experimental single wire saw. The results of the investigations show that compared to the use of SiC abrasive grains having a coarse particle size distribution (PSD) SiC of a fine PSD together with a wire of 100 μm diameter may lead to a reduced roughness of the wafers and an increase of the wafer strength.
A novel design, analysis and 3D printing of Ti-6Al-4V alloy bio-inspired porous femoral stem
Creators: name: Mehboob, Hassan
name: Tarlochan, Faris
name: Mehboob, Ali
name: Chang, Seung-Hwan
name: Ramesh, S.
name: Harun, Wan Sharuzi Wan
name: Kadirgama, Kumaran
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Biomedical engineering

description: The current study is proposing a design envelope for porous Ti-6Al-4V alloy femoral stems to survive under fatigue loads. Numerical computational analysis of these stems with a body-centered-cube (BCC) structure is conducted in ABAQUS. Femoral stems without shell and with various outer dense shell thicknesses (0.5, 1.0, 1.5, and 2 mm) and inner cores (porosities of 90, 77, 63, 47, 30, and 18%) are analyzed. A design space (envelope) is derived by using stem stiffnesses close to that of the femur bone, maximum fatigue stresses of 0.3σys in the porous part, and endurance limits of the dense part of the stems. The Soderberg approach is successfully employed to compute the factor of safety Nf > 1.1. Fully porous stems without dense shells are concluded to fail under fatigue load. It is thus safe to use the porous stems with a shell thickness of 1.5 and 2 mm for all porosities (18–90%), 1 mm shell with 18 and 30% porosities, and 0.5 mm shell with 18% porosity. The reduction in stress shielding was achieved by 28%. Porous stems incorporated BCC structures with dense shells and beads were successfully printed.Other Information Published in: Journal of Materials Science: Materials in Medicine
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10856-020-06420-7
Evolution of long-lived globular cluster stars. II. Sodium abundance variations on the asymptotic giant branch as a function of globular cluster age and metallicity
Creators: name: Charbonnel, C.
name: Chantereau, W.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Long-lived stars in GCs exhibit chemical peculiarities with respect to their halo counterparts. In particular, Na-enriched stars are identified as belonging to a 2d stellar population born from cluster material contaminated by the H-burning ashes of a 1st stellar population. Their presence and numbers in different locations of the CMDs provide important constraints on the self-enrichment scenarios. In particular, the ratio of Na-poor to Na-rich stars on the AGB has recently been found to vary strongly from cluster to cluster, while it is relatively constant on the RGB. We investigate the impact of both age and metallicity on the theoretical Na spread along the AGB within the framework of the fast rotating massive stars scenario for GC self-enrichment. (tb continued)
description: 10 pages, 7 figures, accepted for publication in A&A
Development of titanium dioxide nanowire incorporated poly(vinylidene fluoride–trifluoroethylene) scaffolds for bone tissue engineering applications
Creators: name: Augustine, Anitha
name: Augustine, Robin
name: Hasan, Anwarul
name: Raghuveeran, Varun
name: Rouxel, Didier
name: Kalarikkal, Nandakumar
name: Thomas, Sabu
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Biomedical engineering

description: Critical size bone defects that do not heal spontaneously are among the major reasons for the disability in majority of people with locomotor disabilities. Tissue engineering has become a promising approach for repairing such large tissue injuries including critical size bone defects. Three-dimension (3D) porous scaffolds based on piezoelectric polymers like poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) have received a lot of attention in bone tissue engineering due to their favorable osteogenic properties. Owing to the favourable redox properties, titanium dioxide (TiO2) nanostructures have gained a great deal of attention in bone tissue engineering. In this paper, tissue engineering scaffolds based on P(VDF-TrFE) loaded with TiO2 nanowires (TNW) were developed and evaluated for bone tissue engineering. Wet-chemical method was used for the synthesis of TNW. Obtained TNW were thoroughly characterized for the physicochemical and morphological properties using techniques such as X-Ray diffraction (XRD) analysis and transmission electron microscopy (TEM). Electrospinning was used to produce TNW incorporated P(VDF-TrFE) scaffolds. Developed scaffolds were characterized by state of art techniques such as Scanning Electron Microscopy (SEM), XRD and Differential scanning calorimetry (DSC) analyses. TEM analysis revealed that the obtained TiO2 nanostructures possess nanofibrous morphology with an average diameter of 26 ± 4 nm. Results of characterization of nanocomposite scaffolds confirmed the effective loading of TNW in P(VDF-TrFE) matrix. Fabricated P(VDF-TrFE)/TNW scaffolds possessed good mechanical strength and cytocompatibility. Osteoblast like cells showed higher adhesion and proliferation on the nanocomposite scaffolds. This investigation revealed that the developed P(VDF-TrFE) scaffolds containing TNW can be used as potential scaffolds for bone tissue engineering applications.Other Information Published in: Journal of Materials Science: Materials in Medicine
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10856-019-6300-4
Media literacy concepts & role of media literacy inict's: A literature review
Creators: name: Nisa, Mehr Un
name: Yousafzai, Dost Muhammad
name: Irfan, Muhammad
Publisher: name: University of Limerick
Year: 2022
Subjects: Education

description: This article describes the basic concepts of media literacy, role of information and communication technologies in media literacy and role of media literacy on student’s education. This article review different literatures which are published and available on different websites and it include research work of different scholars, books chapters and dissertations. The researcher finalized forty research articles for the review. The basic scope of the study is to identify the role of media literacy in 21st century.
A Constraint on Quasar Clustering at z=5 from a Binary Quasar
Creators: name: McGreer, Ian
name: Eftekharzadeh, Sarah
name: Myers, Adam
name: Fan, Xiaohui
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report the discovery of a quasar pair at z=5 separated by 21 arcsec. Both objects were identified as quasar candidates using simple color selection techniques applied to photometric catalogs from the CFHT Legacy Survey (CFHTLS). Spectra obtained with the MMT present no discernible offset in redshift between the two objects; on the other hand, there are clear differences in the emission line profiles and in the multiwavelength spectral energy distributions that strongly disfavor the hypothesis that they are gravitationally lensed images of a single quasar. Both quasars are surprisingly bright given their proximity (a projected separation of ~135 kpc), with i=19.4 and i=21.4. Previous measurements of the luminosity function demonstrate that luminous quasars are extremely rare at z=5; the existence of this pair suggests that quasars have strong small-scale clustering at high redshift. Assuming a real-space correlation function of the form $ξ(r) \propto (r/r_0)^{-2}$, this discovery implies a correlation length $r_0 > 20 h^{-1}$ Mpc, consistent with a rapid strengthening of quasar clustering at high redshift as seen in previous observations and predicted by theoretical models where feedback effects are inefficient at shutting down black hole growth at high redshift.
description: Accepted for publication in AJ
Piezoelectric properties of zinc oxide/iron oxide filled polyvinylidene fluoride nanocomposite fibers
Creators: name: AlAhzm, Abdulrahman Mohmmed
name: Alejli, Maan Omar
name: Ponnamma, Deepalekshmi
name: Elgawady, Yara
name: Al-Maadeed, Mariam Al Ali
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Electronics, sensors and digital hardware
Condensed matter physics

description: Piezoelectric nanogenerators (PENG) with flexible and simple design have pronounced significance in fabricating sustainable devices for self-powering electronics. This study demonstrates the fabrication of electrospun nanocomposite fibers from polyvinylidene fluoride (PVDF) filled zinc oxide (ZnO)/iron oxide (FeO) nanomaterials. The nanocomposite fiber based flexible PENG shows piezoelectric output voltage of 5.9 V when 3 wt% of ZnO/FeO hybrid nanomaterial is introduced, which is 29.5 times higher than the neat PVDF. No apparent decline in output voltage is observed for almost 2000 s attributed to the outstanding durability. This higher piezoelectric output performance is correlated with the β-phase transformation studies from the Fourier transformation infrared spectroscopy and the crystallinity studies from the differential scanning calorimetry. Both these studies show respective enhancement of 3.79 and 2.16% in the β-phase crystallinity values of PVDF-ZnO/FeO 3 wt% composite. Higher dielectric constant value obtained for the same composite (three times higher than the neat PVDF) confirms the increased energy storage efficiency as well. Thus the proposed soft and flexible PENG is a promising mechanical energy harvester, and its good dielectric properties reveals the ability to use this material as good power sources for wearable and flexible electronic devices.Other Information Published in: Journal of Materials Science: Materials in Electronics
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10854-021-06020-3
Metal-Insulator Transition in the Hubbard Model: Correlations and Spiral Magnetic Structures
Creators: name: Timirgazin, M. A.
name: Igoshev, P. A.
name: Arzhnikov, A. K.
name: Irkhin, V. Yu.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The metal--insulator transition (MIT) for the square, simple cubic, and body-centered cubic lattices is investigated within the $t-t'$ Hubbard model at half-filling by using both the Hartree-Fock approximation (HFA) generalized for the case of spiral order and Kotliar-Ruckenstein slave-boson approach. It turns out that magnetic scenario of MIT becomes superior over non-magnetic one. The electron correlations lead to some suppression of the spiral phases in comparison with HFA. We found the presence of metallic antiferromagnetic (spiral) phase in the case of three-dimensional lattices.
description: Proc. XXXVII Meeting on Low Temperature Physics, June-July 2015, Kazan, 7 pages
Flexible piezoelectric nanogenerator based on [P(VDF-HFP)]/ PANI-ZnS electrospun nanofibers for electrical energy harvesting
Creators: name: Parangusan, Hemalatha
name: Bhadra, Jolly
name: Al-Thani, Noora
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Electronics, sensors and digital hardware
Condensed matter physics

description: Abstract Over the past decade, piezoelectric nanogenerator have attracted much attention to harvest mechanical energy from abundant resources in nature. Here, the ZnS microspheres is prepared by hydrothermal method and core-shell structured PANI/ZnS microspheres are synthesized by in situ polymerization method and then used as filler for the preparation of flexible [P(VDF-HFP)] based piezoelectric nanogenerator. The flexible P(VDF-HFP)/PANI-ZnS piezoelectric nanogenerator is prepared by Electrospinning technique. The core-shell PANI/ZnS composite improves the content of electroactive phase in [P(VDF-HFP)] and significantly improves the interfacial polarization between the PANI/ZnS particles and polymer matrix. Among all the samples, [P(VDF-HFP)]/2 wt% PANI-ZnS composite nanofibers exhibited the high piezoelectric peak-to-peak output voltage of 3 V compared with the neat [P(VDF-HFP)] (~ 120 mV). In addition, the high dielectric constant is observed for the [P(VDF-HFP)]/2 wt% PANI-ZnS composite nanofibers. These results implies that the fabricated flexible and efficient piezoelectric nanogenerator can be utilized for energy harvesting system.Other Information Published in: Journal of Materials Science: Materials in Electronics
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10854-021-05352-4
Luminescent Solar Concentrators: Cylindrical Design
Creators: name: Bose, R.
name: Farrell, D.J.
name: Pardo- Sanchez, C.
name: Pravettoni, M.
name: Mazzer, M.
name: Chatten, A.J.
name: Barnham, K.W.J.
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; 359-362
description: Luminescent solar concentrators (LSCs) are typically planar low-concentration systems that absorb sunlight over a
large area and emit a red-shifted spectrum out of smaller surfaces, where solar cells can be attached. We present the
study of a composite system, in which a linear geometrical concentrator is used as primary device to focus sunlight
onto a cylindrical LSC encased in a transparent matrix. The idea behind this design is to reduce re-absorption losses,
which generally limit the performance of LSCs. Experimental measurements on a cylindrical LSC were compared
with a raytrace model, showing a good agreement. Further predictions were made based on the model. It was shown
how the reduction of re-absorption losses is achieved by allowing the luminescence from the cylindrical core to
travel in the transparent matrix. The proposed design can achieve high optical concentrations with the need for only
one-dimensional tracking.
An Effective Aqueous Slurry for Multi-Wire Sawing
Creators: name: Batllo, F.
name: Naguib Sant, N.
name: Grumbine, S.
name: Barros, C.
name: Gaudet, G.
name: Rios, J.
name: Jones, L.
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; 1292-1296
description: Wire sawing is currently the most efficient means to create wafers from a silicon ingot. Yet, the major objective to make solar energy cost competitive with conventional forms of electricity is imposing a need for lower manufacturing costs and higher wafering yield, driving further development of new tools and consumables for the manufacture of silicon wafers. This work focuses on the continuing development of an aqueous-based cutting slurry and its benefits in performance, thermal management and recycling efficiency.
Improved electrochemical performance of SiO2-coated Li-rich layered oxides-Li1.2Ni0.13Mn0.54Co0.13O2
Creators: name: James Abraham, Jeffin
name: Nisar, Umair
name: Monawwar, Haya
name: Abdul Quddus, Aisha
name: Shakoor, R. A.
name: Saleh, Mohamed I.
name: Kahraman, Ramazan
name: Al-Qaradawi, Siham
name: Aljaber, Amina S.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Electronics, sensors and digital hardware
Condensed matter physics

description: Lithium-rich layered oxides (LLOs) such as Li1.2Ni0.13Mn0.54Co0.13O2 are suitable cathode materials for future lithium-ion batteries (LIBs). Despite some salient advantages, like low cost, ease of fabrication, high capacity, and higher operating voltage, these materials suffer from low cyclic stability and poor capacity retention. Several different techniques have been proposed to address the limitations associated with LLOs. Herein, we report the surface modification of Li1.2Ni0.13Mn0.54Co0.13O2 by utilizing cheap and readily available silica (SiO2) to improve its electrochemical performance. Towards this direction, Li1.2Ni0.13Mn0.54Co0.13O2 was synthesized utilizing a sol–gel process and coated with SiO2 (SiO2 = 1.0 wt%, 1.5 wt%, and 2.0 wt%) employing dry ball milling technique. XRD, SEM, TEM, elemental mapping and XPS characterization techniques confirm the formation of phase pure materials and presence of SiO2 coating layer on the surface of Li1.2Ni0.13Mn0.54Co0.13O2 particles. The electrochemical measurements indicate that the SiO2-coated Li1.2Ni0.13Mn0.54Co0.13O2 materials show improved electrochemical performance in terms of capacity retention and cyclability when compared to the uncoated material. This improvement in electrochemical performance can be related to the prevention of electrolyte decomposition when in direct contact with the surface of charged Li1.2Ni0.13Mn0.54Co0.13O2 cathode material. The SiO2 coating thus prevents the unwanted side reactions between cathode material and the electrolyte. 1.0 wt% SiO2-coated Li1.2Ni0.13Mn0.54Co0.13O2shows the best electrochemical performance in terms of rate capability and capacity retention.Other Information Published in: Journal of Materials Science: Materials in Electronics
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10854-020-04481-6
Optimization of the Wire Sawing Process Using Force- and Temperature- Measurements
Creators: name: Rietzschel, R.
name: Wagner, T.
name: Funke, C.
name: Möller, H.J.
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; 1301-1304
description: This work presents experimental results obtained on an industrial multi-wire-saw, which has been equipped with special measurement systems. It will be shown that one can obtain more information about the free abrasives sawing process by measuring forces and temperatures with a three-dimensional force sensor and an infrared camera. The dependence of the forces and the brick heating on different machine parameter as wire speed, table speed and size distribution of the sawing particles will be investigated. All experimental data will be analyzed using a theoretical model for the sawing process that has been developed earlier by us. It will be discussed whether the current model is already suitable enough for further optimization of the sawing process in terms of better wafer surface quality and less wafer breakage as well as lower energy consumption.
A Statistical Study of the Average Iron Charge Distributions inside Magnetic Clouds for Solar Cycle 23
Creators: name: Song, Hongqiang
name: Zhong, Ze
name: Chen, Yao
name: Zhang, Jie
name: Cheng, Xin
name: Zhao, Liang
name: Hu, Qiang
name: Li, Gang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Magnetic clouds (MCs) are the interplanetary counterpart of coronal magnetic flux ropes. They can provide valuable information to reveal the flux rope characteristics at their eruption stage in the corona, which are unable to be explored in situ at present. In this paper, we make a comprehensive survey of the average iron charge state (Fe) distributions inside 96 MCs for solar cycle 23 using ACE (Advanced Composition Explorer) data. As the Fe in the solar wind are typically around 9+ to 11+, the Fe charge state is defined as high when the Fe is larger than 12+, which implies the existence of a considerable amount of Fe ions with high charge states (e.g., \geq 16+). The statistical results show that the Fe distributions of 92 (~ 96%) MCs can be classified into four groups with different characteristics. In group A (11 MCs), the Fe shows a bimodal distribution with both peaks higher than 12+. Group B (4 MCs) presents a unimodal distribution of Fe with its peak higher than 12+. In groups C (29 MCs) and D (48 MCs), the Fe remains higher and lower than 12+ throughout ACE passage through the MC, respectively. Possible explanations to these distributions are discussed.
description: 21 pages, 8 figures and 1 table. Accepted by the ApJ
Metal halide-based photodetector using one-dimensional MAPbI3 micro rods
Creators: name: Raza, Ehsan
name: Ahmad, Zubair
name: Mishra, Arti
name: Aziz, Fakhra
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Electronics, sensors and digital hardware
Condensed matter physics

description: In the present work, we report the fabrication of a photodetector using methylammonium lead iodide perovskite (MAPbI3) micro rod. Photosensitivity of the Ag/MAPbI3/Ag photodetector has been studied under various light intensities ranging from 10 to 100 mW/cm2. The MAPbI3 perovskite micro rod-based photodetector shows a high on/off ratio (4.47 × 105), and fast response & recovery times (2.7 ms, each), as compared to the photodetectors using perovskite films. This work could initiate new perspectives for perovskite micro rods to be employed in high-performance optoelectronic devices.Other Information Published in: Journal of Materials Science: Materials in Electronics
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10854-020-03757-1
Influence of Abrasive Concentration on the Quality of Wire-Sawn Silicon Wafers
Creators: name: Bidiville, A.
name: Wasmer, K.
name: Michler, J.
name: Ballif, C.
name: Van Der Meer, M.
name: Nasch, P.M.
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; 1311-1314
description: The sawing parameters have an impact on the depth of the defects in the wafers, and hence on their mechanical strength. However, as sawing is a highly complex system, the wafering industry is still relying on a “trial and error” approach to improve the sawing parameters. In this contribution, the effects of the abrasive concentration are studied with the help of the “rolling-indenting model”, the model most commonly used to describe the sawing process. From roughness and cracks depth measurement correlated with flexure tests, we show that using a lower silicon carbide concentration in the slurry decreases the depth of the defects as well as the roughness and results in a higher breakage strength of the wafers.
Coupling mountain pine beetle and forest population dynamics predicts transient outbreaks that are likely to increase in number with climate change
Creators: Brush, Micah
Lewis, Mark A.
Publisher: name: University of Alberta Library
Year: 2023

Mountain pine beetle (MPB) in Canada have spread well beyond their historical range. Accurate modelling of the long-term dynamics of MPB is critical for assessing the risk of further expansion and informing management strategies, particularly in the context of climate change and variable forest resilience. Most previous models have focused on capturing a single outbreak without tree replacement. While these models are useful for understanding MPB biology and outbreak dynamics, they cannot accurately model long-term forest dynamics. Past models that incorporate forest growth tend to simplify beetle dynamics. We present a new model that couples forest growth to MPB population dynamics and accurately captures key aspects of MPB biology, including a threshold for the number of beetles needed to overcome tree defenses and beetle aggregation that facilitates mass attacks. These mechanisms lead to a demographic Allee effect, which is known to be important in beetle population dynamics. We show that as forest resilience decreases, a fold bifurcation emerges and there is a stable fixed point with a non-zero MPB population. We derive conditions for the existence of this equilibrium. We then simulate biologically relevant scenarios and show that the beetle population approaches this equilibrium with transient boom and bust cycles with period related to the time of forest recovery.  As forest resilience decreases, the Allee threshold also decreases. Thus, if host resilience decreases under climate change, for example under increased stress from drought, then the lower Allee threshold makes transient outbreaks more likely to occur in the future.
Enhancing Light Output of Fluorescent Waveguides with a Microlens System
Creators: name: Tsoi, S.
name: Bastiaansen, C.W.M.
name: Debije, M.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; 377-380
description: A new design to increase the efficiency of luminescent solar concentrators is proposed using a combination of
microstructures and microlenses. The microstructures were fabricated by photolithographic patterning a thin film of
polymethylmethacrylate and Lumogen F Red 305 fluorescent dye mixture. The surface area coverage of the
microstructured thin film was varied from the standard uniform thin layer to 20% waveguide coverage by varying the
width and spacing of the microstructures. Measured edge emission and absorption of the patterned concentrator
show an increase in system efficiency with decreasing surface coverage. To maximize initial microstructure light
absorption, a microlens array was designed using commercial ray-tracing software. The purpose of the lens array is
to focus incident light within a 20-60° cone onto the microstructures covering 20-40% of the waveguide surface. By
reducing dye coverage while maintaining a constant light absorption, a substantial increase in light emission at the
edge of the waveguide may be achieved.
Limits on the LyC signal from z~3 sources with secure redshift and HST coverage in the E-CDFS field
Creators: name: Guaita, L.
name: Pentericci, L.
name: Grazian, A.
name: Vanzella, E.
name: Nonino, M.
name: Giavalisco, M.
name: Zamorani, G.
name: Bongiorno, A.
name: Cassata, P.
name: Castellano, M.
name: Garilli, B.
name: Gawiser, E.
name: Brun, V. Le
name: Fevre, O. Le
name: Lemaux, B. C.
name: Maccagni, D.
name: Merlin, E.
name: Santini, P.
name: Tasca, L. A. M.
name: Thomas, R.
name: Zucca, E.
name: De Barros, S.
name: Hathi, N. P.
name: Amorin, R.
name: Bardelli, S.
name: Fontana, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Aim: We aim to measure the LyC signal from a sample of sources in the Chandra deep field south. We collect star-forming galaxies (SFGs) and active galactic nuclei (AGN) with accurate spectroscopic redshifts, for which Hubble Space Telescope (HST) coverage and multi-wavelength photometry are available. Method: We selected a sample of about 200 sources at z~3. Taking advantage of HST resolution, we applied a careful cleaning procedure and rejected sources showing nearby clumps with different colours, which could be lower-z interlopers. Our clean sample consisted of 86 SFGs (including 19 narrow-band selected Lya emitters) and 8 AGN (including 6 detected in X-rays). We measured the LyC flux from aperture photometry in four narrow-band filters covering wavelengths below a 912 A rest frame (3.11
description: Accepted for publication in A&A on Jan 5th, 2016
Data Module: Curating Data to Enhance Public Library Effectiveness
Creators: name: Million, A.J.
name: Adkins, Denice
name: Goek, Sara
name: Toma, Alex
Publisher: name: My University
Year: 2023
Subjects: subject: Data
subject: Library programming
subject: Evaluation
subject: Data curation
subject: Public libraries
subject: Statistics and Numeric Data
subject: Social Sciences

description: This report describes four datasets, variables used from each, and how variables were selected for inclusion in the dataset entitled "Public Library Services, Programs, and Outreach, United States, 2015-2023." We also describe how the four datasets are related. We recommend aggregating and linking disparate demographic, input, output, and outcome data from 1) the Census Bureau’s American Community Survey, 2) the Institute of Museum and Library Services Public Libraries Survey, 3) the Public Library Association’s Project Outcome toolkit, and 4) a national survey by the Association of Bookmobile and Outreach Services that complements its Bookmobile and Outreach Information Repository. We make recommendations for aggregating and linking datasets based on feedback we received from an advisory committee. We describe the recommendation process to enable data curators at the Inter-university Consortium for Political and Social Research to create a one-of-a-kind dataset and help library researchers replicate our process elsewhere.
Effects of Edge Defects Induced by Multi-Wire Sawing on the Wafer Strength
Creators: name: Wasmer, K.
name: Bidiville, A.
name: Jeanneret, F.
name: Michler, J.
name: Ballif, C.
name: Van Der Meer, M.
name: Nasch, P.M.
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; 1305-1310
description: The focus of the photovoltaic industry is a continuous reduction of the cost of solar energy. Lowering the wafer thickness during the processing by means of multi-wire slurry saw technology is one of the key issue to reduce these costs. However, reducing the wafer thickness without increasing the wafer strength leads to a larger breakage rate during the subsequent fabrication steps. Hence, recent studies have been carried out to enhance the sawing process by minimizing the sub-surface defects. Nevertheless, little efforts have been made to determine at which stage in the wafering process, the most dangerous defects are created for solar cells processing. Are they made during the shaping of the silicon bricks from cast ingots, or during the slicing operation into wafers, or else? State of the art consists in polishing the bricks prior to wafering by multi-wire slurry saw. The goal of this paper is to bring some insights on the importance of the edge defects on the wafer strength. Results using various methods such as roughness measurement, wafer strength measurement with the 4-lines bending tests and finite elements calculations are presented. The main conclusion of this study is that the defects made during the shaping of the bricks prior to wafering can be of high importance with respect to wafer strength.