cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A high-order FEM formulation for free and forced vibration analysis of a nonlocal nonlinear graded Timoshenko nanobeam based on the weak form quadrature element method
Creators: name: Trabelssi, M.
name: El-Borgi, S.
name: Friswell, M. I.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Mechanical engineering
subject: FOS: Mechanical engineering

description: The purpose of this paper is to provide a high-order finite element method (FEM) formulation of nonlocal nonlinear nonlocal graded Timoshenko based on the weak form quadrature element method (WQEM). This formulation offers the advantages and flexibility of the FEM without its limiting low-order accuracy. The nanobeam theory accounts for the von Kármán geometric nonlinearity in addition to Eringen’s nonlocal constitutive models. For the sake of generality, a nonlinear foundation is included in the formulation. The proposed formulation generates high-order derivative terms that cannot be accounted for using regular first- or second-order interpolation functions. Hamilton’s principle is used to derive the variational statement which is discretized using WQEM. The results of a WQEM free vibration study are assessed using data obtained from a similar problem solved by the differential quadrature method (DQM). The study shows that WQEM can offer the same accuracy as DQM with a reduced computational cost. Currently the literature describes a small number of high-order numerical forced vibration problems, the majority of which are limited to DQM. To obtain forced vibration solutions using WQEM, the authors propose two different methods to obtain frequency response curves. The obtained results indicate that the frequency response curves generated by either method closely match their DQM counterparts obtained from the literature, and this is despite the low mesh density used for the WQEM systems.Other Information Published in: Archive of Applied Mechanics
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00419-020-01713-3
PV Controlergy: Monitoring System Based on Credited Measurements and Expert Software, Executed by an Independent Laboratory, for the Control and Analysis of Photovoltaic Plants
Creators: name: López Mendía, A.
name: Ibarrula, D.
name: Torbado, Z.
name: Martinez, B.
name: Garcia, C.
name: Calvente, S.
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; 4074-4075
description: The purpose has been the creation of an integral, on-line, adaptable and efficient monitoring tool for the
correct control and operation of a photovoltaic plant. The monitoring system developed differs from others and it is
based on the following characteristics: Accurate and credited measurements of sensors, registers and other equipment.
Integration of equipments (reading of electricity meters, inverter’s data, strings measurements, solar radiation and other
meteorological measurements). Flexible data base easily adapted to the needs of each plant and development of a
powerful and clear web interface that allows the study and analysis of the plant by means of the design of graphics and
representative calculus and a system of alerts based on expert software.
Detailed Study on the Passivation Mechanism of a-SixC1-x for the Solar Cell Rear Side
Creators: name: Suwito, D.
name: Roth, T.
name: Pysch, D.
name: Korte, L.
name: Richter, A.
name: Janz, S.
name: Glunz, S.W.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Cells and Materials, Processing Technology of

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 1023-1028
description: In this work we focus on the surface passivation of p-FZ, 1 Ωcm silicon wafers by intrinsic, silicon-rich, amorphous silicon carbide (a-SixC1-x:H) with excellent passivation quality (Seff < 5 cms-1 for p- and n-type 1 Ωcm silicon at n=5·1014 cm-3). For the purpose of extracting the effective surface recombination velocity (Seff) independent of the bulk properties, we use a set of identically passivated wafers of different substrate thickness (W). The injection-dependent carrier lifetime eff(n) is determined in a wide injection level range (1010-1017 cm-3) using a combination of the quasi-steady-state photoconductance (QSS-PC) and photoluminescence (QSS-PL) technique. Seff is extracted by evaluation of the slope of the 1/eff vs. 1/W plot for each injection level without any additional assumptions on the bulk lifetime. These pure Seff data obtained in such a way is then used within the simple Shockley-Read-Hall (SRH) model to extract surface parameters such as the interface charge density Qf. Surface photovoltage measurements (SPV) performed on the a-SiC/c-Si system confirm an amphoteric behaviour of the interface charge. Our study shows that the low-injection lifetime data determined by QSS-PL plays a crucial role for the accurate modelling of surface parameters.
Machine learning and discriminant function analysis in the formulation of generic models for sex prediction using patella measurements
Creators: name: Bidmos, Mubarak A.
name: Olateju, Oladiran I.
name: Latiff, Sabiha
name: Rahman, Tawsifur
name: Chowdhury, Muhammad E. H.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Clinical sciences

description: Sex prediction from bone measurements that display sexual dimorphism is one of the most important aspects of forensic anthropology. Some bones like the skull and pelvis display distinct morphological traits that are based on shape. These morphological traits which are sexually dimorphic across different population groups have been shown to provide an acceptably high degree of accuracy in the prediction of sex. A sample of 100 patella of Mixed Ancestry South Africans (MASA) was collected from the Dart collection. Six parameters: maximum height (maxh), maximum breadth (maxw), maximum thickness (maxt), the height of articular facet (haf), lateral articular facet breadth (lafb), and medial articular facet breath (mafb) were used in this study. Stepwise and direct discriminant function analyses were performed for measurements that exhibited significant differences between male and female mean measurements, and the “leave-one-out” approach was used for validation. Moreover, we have used eight classical machine learning techniques along with feature ranking techniques to identify the best feature combinations for sex prediction. A stacking machine learning technique was trained and validated to classify the sex of the subject. Here, we have used the top performing three ML classifiers as base learners and the predictions of these models were used as inputs to different machine learning classifiers as meta learners to make the final decision. The measurements of the patella of South Africans are sexually dimorphic and this observation is consistent with previous studies on the patella of different countries. The range of average accuracies obtained for pooled multivariate discriminant function equations is 81.9–84.2%, while the stacking ML technique provides 90.8% accuracy which compares well with those presented for previous studies in other parts of the world. In conclusion, the models proposed in this study from measurements of the patella of different population groups in South Africa are useful resent with reasonably high average accuracies.Other Information Published in: International Journal of Legal Medicine
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00414-022-02899-7
A Tool for the 24 Hours Forecast of Photovoltaic Production
Creators: name: Le-Pivert, X.
name: Sicot, L.
name: Merten, J.
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; 4076-4079
description: The rapid growth of photovoltaic production connected to the network will lead in the coming years to
a high penetration rate of this intermittent energy in some distribution networks, especially islands.
It is the intermittent and random nature of this type of production which is very demanding for the grid. It is therefore
important to accurately predict the global photovoltaic production in a given territory, which can be considered in the
planning of the network operator.
It is in this context that we have developed a forecasting tool based on physical models and weather forecasts. This
tool automatically retrieves weather forecasts, and then refines it in time and space. Taking into account the main
features of the plant (location, power, orientation, tilt, ...), the algorithm then calculates the PV production at all
times. A second tool performs learning function in order to improve, day by day, the accuracy of forecasting.
Our prediction system has been tested during one year on two locations: one in the French Alps and another in the
south of France in a very sunny place. The mean absolute error, calculated on an half-hour basis, is less than 10%.
High Efficiency Industrial Type PERC Solar Cell on Very Thin EFG Substrates
Creators: name: Choulat, P.
name: Ma, Y.
name: Chan, B.T.
name: John, J.
name: Nagel, H.
name: Horzel, J.
name: Forment, S.
name: Agostinelli, G.
name: Beaucarne, G.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Cells and Materials, Processing Technology of

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 1043-1047
description: In this paper, we report on high efficiency industrial type solar cells on very thin EFG substrates of 100 cm2: 15.6% on 140 μm thick, and 16% on 170 μm thick on a base resistivity of 3 Ohm cm and 1 Ohm cm respectively. In both solar cells structures, we adopt a well passivated rear surface and local contacts. The process used in this work combines the advantage of using the applicability of a low quality oxide associated with a PECVD Silicon Nitride for the rear passivation and the use of the existing industrial technique for screen printing and contacts co-firing. In addition, to reduce front reflectance and enhance optical confinement, plasma technology using SF6/Cl2 chemistry is chosen to develop a well suited texturing process for shiny EFG surfaces. A Voc of 624 mV was achieved on the 1 Ohm cm EFG substrate, and a gain of about 1% in absolute efficiency compared to the classical Al BSF cell concept is observed. We show that an absolute gain of 0.85 mA/cm2 is attained by means of front texturing only, and that an additional gain of 0.4 mA/cm2 is obtained by reducing rear surface recombination velocity and by increasing internal rear reflectance when replacing the Aluminium contact by a dielectric stack.
The optimal route of progesterone administration for luteal phase support in a frozen embryo transfer: a systematic review
Creators: name: Almohammadi, Abdulla
name: Raveendran, Ainharan
name: Black, Mairead
name: Maheshwari, Abha
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Reproductive medicine

description: Objective To investigate the optimal route of progesterone administration for luteal phase support in a frozen embryo transfer. Design Systematic review. Patients Women undergoing frozen embryo transfer (FET). Interventions We conducted an extensive database search of Medline (PubMed), Embase, Web of Science, and Cochrane Trials Register using relevant keywords and their combinations to find randomized controlled trials (RCTs) comparing the routes (i.e., oral, vaginal, intramuscular) of progesterone administration for luteal phase support (LPS) in artificial FET. Main outcome measures Clinical pregnancy, live birth, miscarriage. Results Four RCTs with 3245 participants undergoing artificial endometrial preparation (EP) cycles during FET were found to be eligible. Four trials compared vaginal progesterone with intramuscular progesterone and two trials compared vaginal progesterone with oral progesterone. One study favored of vaginal versus oral progesterone for clinical pregnancy rates (RR 0.45, 95% CI 0.22–0.92) and other study favored intramuscular versus vaginal progesterone for clinical pregnancy rates (RR 1.46, 95% CI 1.21–1.76) and live birth rates (RR 1.62, 95% CI 1.28–2.05). Tabulation of overall evidence strength assessment showed low-quality evidence on the basis that for each outcome-comparison pair, there were deficiencies in either directness of outcome measurement or study quality. Conclusion There was little consensus and evidence was heterogeneous on the optimal route of administration of progesterone for LPS during FET in artificial EP cycles. This warrants more trials, indirect comparisons, and network meta-analyses. PROPERO No CRD42021251017.Other Information Published in: Archives of Gynecology and Obstetrics
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00404-022-06674-2
History of WOFAPS (1963–2019)
Creators: name: Boix-Ochoa, Jose
name: Sigalet, David
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Clinical sciences

description: The formation of the World Federation of Associations of Pediatric Surgery (WOFAPS) was an important unifying force in the emergence of pediatric surgery as a distinct specialty. Beginning with the formation of several national societies in the early ‘60s, an early, multinational effort was created. This was in large part fostered by the International Pediatric Association (IPA), which lent logistical support from the medical pediatric community to the pediatric surgeons. In 2001, the mission of the Federation was formalized to focus on the development and education of surgeons serving children, in all parts of the world. This was articulated in the famous Kyoto Declaration of Pediatric Surgery: “Every infant and child who suffers from an illness or disease has the right to be treated in an environment devoted to their care by a pediatric medical or surgical specialist”. This vision was unique at the time and foreshadowed the major increase in advocacy activity which has emerged in recent years. While the mission has evolved with time, the present organization continues to hold true to the guiding principles of the original founders and seeks to improve the quality of “Surgical Care for the child, no matter where they live”. Education and collaboration across borders underpins the organization’s endeavors.Other Information Published in: Pediatric Surgery International
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00383-020-04651-x
Presenting symptoms and time to diagnosis for Pediatric Central Nervous System Tumors in Qatar: a report from Pediatric Neuro-Oncology Service in Qatar
Creators: name: Maaz, Ata U. R.
name: Yousif, Tayseer
name: Saleh, Ayman
name: Pople, Ian
name: Al-Kharazi, Khalid
name: Al-Rayahi, Jehan
name: Elkum, Naser
name: Malik, Muzaffar
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Clinical sciences
subject: Neurosciences
subject: FOS: Clinical medicine

description: Introduction There are no previous published reports on primary pediatric tumors of the central nervous system (CNS) in Qatar. We undertook this retrospective cohort study to review the diagnosis of CNS tumors in children in Qatar to analyze the presentation characteristics including symptoms, referral pathways, and time to diagnosis. Methods All children registered with Pediatric Neuro-Oncology service (PNOS) were included in the study. Data from the time of diagnosis (October 2007 to February 2020) were reviewed retrospectively. Presenting symptoms were recorded and pre-diagnosis symptom interval (PSI) was calculated from the onset of the first symptom to the date of diagnostic imaging. Results Of the 61 children registered with PNOS during the study period, 51 were included in the final analysis. Ten children were excluded because they were either diagnosed outside Qatar (n = 7) or were asymptomatic at the time of diagnosis (n = 3). The median age was 45 (range 1–171) months. Common tumor types included low-grade glioma (LGG) (47.1%) and medulloblastoma/primitive neuro-ectodermal tumors (PNET) (23.5%). Nine children had an underlying neurocutaneous syndrome. Thirty-eight patients (74.5%) had at least one previous contact with healthcare (HC) professional, but 27 (52%) were still diagnosed through the emergency department (ED). Presenting symptoms included headache, vomiting (36.2%), oculo-visual symptoms (20.6%), motor weakness (18.9%), seizures, ataxia (17.2% each), irritability, cranial nerve palsies (12% each), and endocrine symptoms (10.3%). Median PSI was 28 days (range 1–845 days) for all CNS tumors. Longest PSI was seen with germ cell tumors (median 146 days), supratentorial location (39 days), and age above 3 years (30 days). Tumor characteristics of biological behavior (high-grade tumor) and location (infratentorial) were significantly associated with shorter PSI, as were presenting symptoms of ataxia, head tilt, and altered consciousness. Conclusions Although overall diagnostic times were acceptable, some tumor types were diagnosed after a significant delay. The awareness campaign, such as the “HeadSmart” campaign in the United Kingdom (UK), can improve diagnostic times in Qatar. Further research is required to better understand the reasons for the delay.Other Information Published in: Child's Nervous System
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00381-020-04815-z
Rondine PV Concentrators: Field Results and Innovations
Creators: name: Antonini, A.
name: Butturi, M.A.
name: Di Benedetto, P.
name: Milan, E.
name: Uderzo, D.
name: Zurru, P.
name: Parretta, A.
name: Baggio, N.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
Terrestrial Concentrator Systems

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 150-155
description: Rondine® photovoltaic concentrators have been developed by CPower Srl during the last 3 years; these
CPV modules have a low concentration (20-25x) and use Silicon solar cells, combined with a reflective, non-imaging
optics. Two systems of 3.67 kWp* and 4.65kWp* have been installed in North and South Italy during 2008. The
modules have been mounted on cheap 2-axis trackers for standard, flat plate PV modules, considering the high
angular acceptance of the employed optics. The energy production from these systems have been compared with that
forecasted by the PVGIS software for the estimation of energy production for 2-axis PV tracking systems; the
obtained results have been useful employed for the development of the new Rondine module which will be produced
in the low industrial volume of 5MW/y during 2010.
(*rated at 850W/m2 of DNI)
The warfare of words in the twenty-first century: ‘war on terror’ in the eyes of the Arab media
Creators: name: Hamdach, Widyane
Publisher: name: No Publisher Supplied
Year: 2022

description: This dissertation examines the war on terror from the Arab media perspective by exploring how two different Arab media groups portrayed the War on Terror: the first group is Aljazeera-Arabic, and the second group is (Al Arabiya and Egyptian media outlets). These news outlets were selected because they are notably different in their coverage of terrorism and to conduct comparative analysis to address the following research questions: How is the War on Terror portrayed in the Arab Media? And what are the main similarities and differences between group 1 and Group 2 in their coverage of War on Terror? Qualitative research method is suitable approach to answer these type of research questions and to examine common themes in the Arab media discourse. The findings of qualitative research are powerful and truthful as they reflect the views of the Arab media on terrorism. The sample size includes 250 news materials published after 9/11/2001 (the declaration of the war on terror) to mid-2019. The data was randomly selected at a fixed interval (5th news article in each page) and based on the published date of the news. Coding was conducted by highlighting major themes in the Arab media coverage of the war on terror. Qualitative Data Analysis was utilized to interpret the collected data and findings. This study helps us understand how Arab states deal with terrorism and assess the effectiveness of their counterterrorism policy, the crucial role of politics in shaping the Arab media, the destructive impact of the war on human rights, the roots behind the warfare of words between major Arab states (Qatar vs. Saudi Arabia and Egypt) and their relations with the US, and how the war remodeled foreign relations and the traditional/Westphalian meaning of sovereignty, and explores some solutions to eradicate terrorism. Our understanding of terrorism is evolving, it varies according to place, time, and world events. Thus, this study explores how the Arab media framed the war on terror across different events and time periods within the national and international dynamics and geopolitical interests.
Principles and Applicability of Integrated Remediation Strategies for Heavy Metal Removal/Recovery from Contaminated Environments
Creators: name: Alsafran, Mohammed
name: Saleem, Muhammad Hamzah
name: Al Jabri, Hareb
name: Rizwan, Muhammad
name: Usman, Kamal
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Crop and pasture production
Plant biology

description: Contamination of agricultural soils with heavy metals present lethal consequences in terms of diverse ecological and environmental problems that entail entry of metal in food chain, soil deterioration, plant growth suppression, yield reduction and alteration in microbial community. Metal polluted soils have become a major concern for scientists around the globe. In more recent times, armed with new knowledge and understanding, removal of heavy metals using different applications has emerged as a solution for waste treatment and contaminant remediation in water and soil. However, the description of metal toxicity to the plants and its removal and degradation from the soil is limited. There are a number of reports in the literature where PGP bacterial inoculation and various chelating agents improves metal accumulation and it’s detoxification in different plant parts without influencing plant growth. Therefore, there is a need to select some useful chemicals which possess the potential to improve plant growth as well as expedite the phytoremediation of metals. In this review, we have discussed the mechanisms possessed by different chelating agents to promote plant growth and phytoremediation of metals. We anticipate that this analysis of interconnected systems will lead to the discovery of new research fields.Other Information Published in: Journal of Plant Growth Regulation
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00344-022-10803-1
Fabrication of H2S gas sensors using ZnxCu1-xFe2O4 nanoparticles
Creators: name: Haija, Mohammad Abu
name: Chamakh, Mariem
name: Othman, Israa
name: Banat, Fawzi
name: Ayesh, Ahmad I.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Analytical chemistry
Physical chemistry

description: Spinel ferrite nanoparticles can be easily retrieved and utilized for multiple cycles due to their magnetic properties. In this work, nanoparticles of a ZnxCu1-xFe2O4 composition were synthesized by employing a sol–gel auto-combustion technique. The morphology, composition, and crystal structure were examined using scanning electron microscopy, infrared spectroscopy, and X-ray diffraction. The produced nanoparticles are in the range of 30–70 nm and manifest spinel cubic structure. The nanoparticles were tested for their sensitivity to H2 and H2S gases, and the Cu-based spinel ferrite nanoparticles were found the most sensitive and selective to H2S gas. Their enhanced response to H2S gas was attributed to the production of metallic CuFeS2 that manifest higher electrical conductivity as compared with CuFe2O4. The fabricated sensors are functional at low temperatures, and consequently, they need low operational power. They are also simple to fabricate with appropriate cost.Other Information Published in: Applied Physics A
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00339-020-03661-9
Volume entrained in the wake of a disc intruding into an oil-water interface
Creators: name: Peters, Ivo R.
name: Madonia, Matteo
name: Lohse, Detlef
name: van der Meer, Devaraj
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: An object moving through a plane interface into a fluid deforms the interface in such a way that fluid from one side of the interface is entrained into the other side, a phenomenon known as Darwin's drift. We investigate this phenomenon experimentally using a disc which is started exactly at the interface of two immiscible fluids, namely oil and water. First, we observe that due to the density difference between the two fluids the deformation of the interface is influenced by gravity, and show that there exits a time window of universal behavior. Secondly, we show by comparing with boundary integral simulations that, even though the deformation is universal, our results cannot be fully explained by potential flow solutions. We attribute this difference to the starting vortex, which is created in the wake of the disc. Universal behavior is preserved, however, because the size and strength of the vortex shows the same universality as the potential flow solution.
Vertical silicon nanowire-based racetrack resonator optical sensor
Creators: name: Sherif, S. M.
name: Elsayed, M. Y.
name: Shahada, L. A.
name: Swillam, M. A.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Analytical chemistry
Physical chemistry

description: We propose a highly sensitive optical sensor which is built from silicon nanowires. The silicon nanowires are arranged to form a ring resonator. The silicon nanowires cladding and voids are filled with the analyte. The sensor has a small footprint of 16 μm × 16.5 μm. The insertion loss of the sensor is only 0.4 dB, while it is characterized by its high sensitivity of 430 nm/RIU. As a biosensor, our device showed a 100 nm/RIU sensitivity when a thin biolayer of 10 nm thickness is attached to the silicon nanowire structures.Other Information Published in: Applied Physics A
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00339-019-2942-9
Powerful High Efficiency GaSb TPV and PV Cells
Creators: name: Khvostikov, V.P.
name: Sorokina, S.V.
name: Potapovich, N.S.
name: Vlasov, A.S.
name: Shvarts, M.Z.
name: Timoshina, N.Kh.
name: Andreev, V.M.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 174-177
description: GaSb based structures were developed and fabricated by the Zn-diffusion technique for solar and
thermophotovoltaic applications. The effect of Zn diffused emitter etching by means of anodic oxidation on the
behaviour of characteristics of cells fabricated from GaSb (100) wafers was investigated. An optimum Zn diffused
profile and penetration depth of a p-n junction have been found, which allowed obtaining the maximum efficiency of
GaSb cells at a high generated photocurrent density up to 10 A/cm2.
Production of sensitive gas sensors using CuO/SnO2 nanoparticles
Creators: name: Ayesh, Ahmad I.
name: Alyafei, Aldana A.
name: Anjum, Rameen S.
name: Mohamed, Radwa M.
name: Abuharb, Mai B.
name: Salah, Belal
name: El-Muraikhi, Maitha
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Analytical chemistry
Physical chemistry

description: Metal oxide nanoparticles, such as CuO and SnO2, are outstanding systems for H2S gas sensing in air. In this work, those nanoparticles were deposited with different mixing percentages on substrates to form percolating networks of nanoparticles. Electrical electrodes were deposited on the nanoparticles’ films to investigate their gas sensing response against H2 and H2S, and their electrical characteristics. The sensor devices based on CuO–SnO2 nanoparticles revealed enhanced sensing characteristics against H2S with a sensitivity of 10 ppm. The enhanced sensing characteristics could be attributed to the formation of PN-junctions among CuO and SnO2 nanoparticles. The reasonable production cost (due to simple structure and cheap used materials), low power consumption ( ~ 1 µW for H2S at room temperature), high sensitivity, high response, and reasonable response time of the present sensors qualify them for practical implementation in portable gas sensing devices with enhanced characteristics.Other Information Published in: Applied Physics A
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00339-019-2856-6
Metaphors of Religion
Creators: name: Gebhard, Henning
name: Jha, Vandana
name: Tögel, Philipp
name: Dipper, Stefanie
name: Elwert, Frederik
name: Tonne, Danah
Publisher: name: Zenodo
Year: 2023
Subjects: Metaphern
Religion
Annotation
Thesaurus
Linked Open Data
Modellierung
Annotieren
Infrastruktur
Projekte
Forschung
virtuelle Forschungsumgebungen
DHd2023

description: The CRC studies the role of metaphor in religious meaning-making. In metaphors, meaning is transferred from one semantic domain to another. By adopting conceptual metaphor theory, the CRC seeks to more thoroughly understand this process and to research its semantic forms empirically and comparatively. Through its multidisciplinary subprojects the CRC contributes to the historiography and the comparative study of religions. It covers various religious traditions from across the globe, working with texts from multiple languages and diverse genres, dating from 3,000 BCE to the present. To enable comparability and interoperability between its extremely heterogeneous subprojects, the CRC deliberately puts emphasis on a shared digital infrastructure (data repository, annotation-tool, conceptual thesaurus), provided by the information infrastructure (INF) project. Utilizing this infrastructure, the subprojects annotate religious texts to not only mark the presence of metaphors, but to include complex analysis of the structural functionings of the metaphor and the resulting domain mappings. A contribution to the 9. Tagung des Verbands "Digital Humanities im deutschsprachigen Raum" - DHd 2023 Open Humanities Open Culture.
Configurational entropy of polar glass formers and the effect of electric field on glass transition
Creators: name: Matyushov, D. V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A model of low-temperature polar liquids is constructed that accounts for configurational heat capacity, entropy, and the effect of a strong electric field on the glass transition. The model is based on Pad{é}-truncated perturbation expansions of the liquid state theory. Depending on parameters, it accommodates an ideal glass transition of vanishing configurational entropy and its avoidance, with a square-root divergent enumeration function at the point of its termination. A composite density-temperature parameter $ρ^γ/T$, often used to represent combined pressure and temperature data, follows from the model. The theory is in good agreement with experimental data for excess (over the crystal state) thermodynamics of molecular glass formers. We suggest that the Kauzmann entropy crisis might be a signature of vanishing configurational entropy of a subset of degrees of freedom, multipolar rotations in our model. This scenario has observable consequences: (i) a dynamical cross-over of the relaxation time and (ii) the fragility index defined by the ratio of the excess heat capacity and excess entropy at the glass transition. The Kauzmann temperature of vanishing configurational entropy, and the corresponding glass transition temperature, shift upward when the electric field is applied. The temperature shift scales quadratically with the field strength.
The parent skilling process for informed input into the school learning environment
Creators: name: Williams, Sharon
Publisher: name: CQUniversity
Year: 2022
Subjects: subject: 130399 Specialist Studies in Education not elsewhere classified
subject: FOS: Educational sciences

description: The issue of community involvement in schools is of significance to all educational stakeholders. It is by its very nature, a contentious issue which has the potential to impact upon all areas of the schooling process. In response to an evident need to investigate the changing parent/school relationship, a study was designed to examine parents' informed input into the classroom and the processes appropriate for these developments. As a result of participating in the study, a community of learners emerged, bound by a commonality of interests, goals and beliefs. This was an important outcome of the research, as it provides a basis from which to assist both teachers and parents in adjusting to and accommodating these roles in the developing school/community partnership.
Inverter-Integrated Motor Control Unit for Two-Axis (C)PV Trackers: The Tracking Inverter
Creators: name: Stalter, O.
name: Burger, B.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
Terrestrial Concentrator Systems

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 145-149
description: The first important idea presented in this paper concerns the combination of a Photovoltaic (PV) gridfeeding
inverter with a Motor Control Unit (MCU) for dual-axis Concentrating PV (CPV) solar trackers. This hybrid
device, also called “Tracking Inverter”, allows plenty of technical and financial advantages for large scale (C)PV
power plants. Indeed, it facilitates the overall tracker control and is much more cost effective compared to conventional
dual-device architectures. The second major idea presented in this paper is a new sun tracking method integrated
in the Tracking Inverter. This revolutionary dual-axis tracker control is based on an algorithm which purpose
consists in continuously maximizing the inverter power by optimizing the mechanical tracker position. Due to the
evident analogy with the well-known electrical Maximum Power Point Tracker (MPPTe), this new tracking method
has been called mechanical Maximum Power Point Tracker (MPPTm).
Population genetic structure of a major reef-building coral species Acropora downingi in northeastern Arabian Peninsula
Creators: name: Torquato, Felipe
name: Bouwmeester, Jessica
name: Range, Pedro
name: Marshell, Alyssa
name: Priest, Mark A.
name: Burt, John A.
name: Møller, Peter R.
name: Ben-Hamadou, Radhouan
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Current seawater temperatures around the northeastern Arabian Peninsula resemble future global forecasts as temperatures > 35 °C are commonly observed in summer. To provide a more fundamental aim of understanding the structure of wild populations in extreme environmental conditions, we conducted a population genetic study of a widespread, regional endemic table coral species, Acropora downingi, across the northeastern Arabian Peninsula. A total of 63 samples were collected in the southern Arabian/Persian Gulf (Abu Dhabi and Qatar) and the Sea of Oman (northeastern Oman). Using RAD-seq techniques, we described the population structure of A. downingi across the study area. Pairwise G’st and distance-based analyses using neutral markers displayed two distinct genetic clusters: one represented by Arabian/Persian Gulf individuals, and the other by Sea of Oman individuals. Nevertheless, a model-based method applied to the genetic data suggested a panmictic population encompassing both seas. Hypotheses to explain the distinctiveness of phylogeographic subregions in the northeastern Arabian Peninsula rely on either (1) bottleneck events due to successive mass coral bleaching, (2) recent founder effect, (3) ecological speciation due to the large spatial gradients in physical conditions, or (4) the combination of seascape features, ocean circulation and larval traits. Neutral markers indicated a slightly structured population of A. downingi, which exclude the ecological speciation hypothesis. Future studies across a broader range of organisms are required to furnish evidence for existing hypotheses explaining a population structure observed in the study area. Though this is the most thermally tolerant acroporid species worldwide, A. downingi corals in the Arabian/Persian Gulf have undergone major mortality events over the past three decades. Therefore, the present genetic study has important implications for understanding patterns and processes of differentiation in this group, whose populations may be pushed to extinction as the Arabian/Persian Gulf warms.Other Information Published in: Coral Reefs
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00338-021-02158-y
A note on some superintegrable Hamiltonian systems
Creators: name: Fordy, Allan P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: 17B63, 37J15, 37J35, 70H06, 70H20

description: We consider some examples of superintegrable system which were recently isolated through a differential Galois group analysis. The identity of these systems is clarified and the corresponding Poisson algebras derived.
description: 7 pages
Tracked Megawatt PV Plants: Operation Results 2008 in Germany and Spain
Creators: name: Rindelhardt, U.
name: Dietrich, A.
name: Rösner, C.
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; 3910-3913
description: The paper presents the operation results of 5 dual-axis tracked PV plants located in Germany and
Spain for 2008. Different tracking principles are implemented in the both German plants. One plant exactly follows
the astronomical sun path, whereas the other tries to find the maximum irradiance also at cloudy conditions. The
Spanish plants generally follow the sun path.
The annual irradiation in 2008 nearly corresponds to the long time average in both countries. There is no clear
difference in the final yield of the German plants (approximately 1260 kWh/kW); some results indicate a larger
influence of the used modules. The final yields of the Spanish PV plants exceed those of the German plants by nearly
78% which is in agreement with the different irradiance and temperature conditions.
Localized outbreaks of coral disease on Arabian reefs are linked to extreme temperatures and environmental stressors
Creators: name: Aeby, Greta Smith
name: Howells, Emily
name: Work, Thierry
name: Abrego, David
name: Williams, Gareth J.
name: Wedding, Lisa M.
name: Caldwell, Jamie M.
name: Moritsch, Monica
name: Burt, John A.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: The Arabian Peninsula borders the hottest reefs in the world, and corals living in these extreme environments can provide insight into the effects of warming on coral health and disease. Here, we examined coral reef health at 17 sites across three regions along the northeastern Arabian Peninsula (Persian Gulf, Strait of Hormuz and Oman Sea) representing a gradient of environmental conditions. The Persian Gulf has extreme seasonal fluctuations in temperature and chronic hypersalinity, whereas the other two regions experience more moderate conditions. Field surveys identified 13 coral diseases including tissue loss diseases of unknown etiology (white syndromes) in Porites, Platygyra, Dipsastraea, Cyphastrea, Acropora and Goniopora; growth anomalies in Porites, Platygyra and Dipsastraea; black band disease in Platygyra, Dipsastraea, Acropora, Echinopora and Pavona; bleached patches in Porites and Goniopora and a disease unique to this region, yellow-banded tissue loss in Porites. The most widespread diseases were Platygyra growth anomalies (52.9% of all surveys), Acropora white syndrome (47.1%) and Porites bleached patches (35.3%). We found a number of diseases not yet reported in this region and found differential disease susceptibility among coral taxa. Disease prevalence was higher on reefs within the Persian Gulf (avg. 2.05%) as compared to reefs within the Strait of Hormuz (0.46%) or Oman Sea (0.25%). A high number of localized disease outbreaks (8 of 17 sites) were found, especially within the Persian Gulf (5 of 8 sites). Across all regions, the majority of variation in disease prevalence (82.2%) was associated with the extreme temperature range experienced by these corals combined with measures of organic pollution and proximity to shore. Thermal stress is known to drive a number of coral diseases, and thus, this region provides a platform to study disease at the edge of corals’ thermal range.Other Information Published in: Coral Reefs
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00338-020-01928-4
Hydrogenated Aluminium Oxide Films Deposited by Plasma Enhanced Chemical Vapor Deposition for Passivation of p-Type Crystalline Silicon
Creators: name: Miyajima, S.
name: Irikawa, J.
name: Yamada, A.
name: Konagai, M.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Cells and Materials, Processing Technology of

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 1029-1032
description: Passivation quality of hydrogenated amorphous aluminum oxide (a-Al1-xOx:H) films were investigated for the rear side passivation layer of c-Si solar cells using a p-type wafer. a-Al1-xOx:H films were deposited by plasma enhanced chemical vapor deposition (PECVD) using a mixture of trimethylaluminum (TMA), carbon dioxide (CO2) and hydrogen (H2) at a low substrate temperature of about 200oC. Gas flow ratio of CO2/TMA influences film properties of a-Al1-xOx:H films and is a key factor to realize high quality passivation of c-Si. Thermal annealing significantly improved the passivation quality of a-Al1-xOx:H films for p-type c-Si although as-deposited a-Al1-xOx:H films showed very poor passivation quality. A 28 nm thin a-Al1-xOx:H film showed a surface recombination velocity of about 10 cm/s under the optimum condition.
Diagnostic value of ultrasonography in acute lateral and syndesmotic ligamentous ankle injuries
Creators: name: Baltes, Thomas P. A.
name: Arnáiz, Javier
name: Geertsema, Liesel
name: Geertsema, Celeste
name: D’Hooghe, Pieter
name: Kerkhoffs, Gino M. M. J.
name: Tol, Johannes L.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Clinical sciences

description: Objectives To determine the diagnostic value of ultrasonography for complete discontinuity of the anterior talofibular ligament (ATFL), the calcaneofibular ligament (CFL) and the anterior inferior tibiofibular ligament (AITFL). Methods All acute ankle injuries in adult athletes (> 18 years old) presenting to the outpatient department of a specialised Orthopaedic and Sports Medicine Hospital within 7 days post-injury were assessed for eligibility. Using ultrasonography, one musculoskeletal radiologist assessed the ATFL, CFL and AITFL for complete discontinuity. Dynamic ultrasound measurements of the tibiofibular distance (mm) in both ankles (injured and contralateral) were acquired in the neutral position (N), during maximal external rotation (Max ER), and maximal internal rotation (Max IR). MR imaging was used as a reference standard. Results Between October 2017 and July 2019, 92 acute ankle injuries were included. Ultrasound diagnosed complete discontinuity of the ATFL with 87% (CI 74–95%) sensitivity and 69% (CI 53–82%) specificity. Discontinuity of the CFL was diagnosed with 29% (CI 10–56%) sensitivity and 92% (CI 83–97%) specificity. Ultrasound diagnosed discontinuity of the AITFL with 100% (CI 74–100%) sensitivity and 100% (CI 95–100%) specificity. Of the dynamic measurements, the side-to-side difference in external rotation had the highest diagnostic value for complete discontinuity of the AITFL (sensitivity 82%, specificity 86%; cut-off 0.93 mm). Conclusions Ultrasound has a good to excellent diagnostic value for complete discontinuity of the ATFL and AITFL. Therefore, ultrasound can be used to screen for injury of the ATFL and AITFL. Compared with ultrasound, dynamic ultrasound has inferior diagnostic value for complete discontinuity of the AITFL. Key Points • Ultrasound has a good to excellent diagnostic value for complete discontinuity of the anterior talofibular ligament (ATFL) and anterior inferior tibiofibular ligament (AITFL). • Ultrasound can be used to screen for injury of the ATFL and AITFL. • Compared with ultrasound, dynamic ultrasound has inferior diagnostic value for complete discontinuity of the AITFL.Other Information Published in: European Radiology
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s00330-020-07305-7
Operation Design and Data Mining of Battery System in Photovoltaics
Creators: name: Sato, K.
name: Wakao, S.
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; 3882-3887
description: In this paper, we deal with photovoltaics (PV) systems with storage batteries. First, we verify the
effectiveness of switching the battery operation mode according to the weather forecast by means of multi-objective
optimization. On another front, as the number of objective functions increases, it becomes difficult to appropriately
evaluate the correlation among objective functions and design variables. With this background, we propose the novel
computational method for data mining of PV system design, which enable us to effectively extract design
information.