cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Origin of Emitter-Like Recombination for Inverted c-Si Surfaces
Creators: name: Martín, I.
name: Hoex, B.
name: Van De Sanden, M.
name: Alcubilla, R.
name: Kessels, 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; 1388-1392
description: c-Si samples whose surface passivation is based on highly inverted surfaces experimentally show a decrease in effective lifetime at low illumination levels while a flat dependence is expected from the current theoretical understanding. As an explanation for this discrepancy we propose a defect-rich bulk region close to c-Si surface. From an analytical approach, we deduce that the final lifetime dependence is a combination between an emitter-like term and a quasi-neutral bulk recombination term. Next, we use numerical modeling to simulate eff(n) curves depending on damage depth, lifetime in the damaged region and the doping density. Simulations show that inverted surfaces in highly-doped substrates are more sensitive to shallow defect regions. On the other hand, very lowly doped c-Si substrates show a lifetime reduction at high injection and the presence of a small “hump” in the lifetime when overall recombination becomes Auger-dominated. Finally, we show that experimental eff(n) curves of a-SiNx:H and Al2O3 c-Si passivated c-Si samples demonstrate the predicted characteristics which could not properly be accounted for previously.
Policy, Regulation, Community Wireless Networks
Creators: Uppalapati Sai Krishna Teja
Publisher: name: University of Alberta Library
Year: 2023

Wireless community networks (WCNs), also known as wireless community projects or community networks, are decentralized, collaborative networks self-managed and self-organized locally by communities, non-governmental organizations, and cooperatives tooffer consumers a viable alternative to municipal wireless networks.

Wireless networks occasionally support total freedom from censorship, which may conflict with the proper usage guidelines of some commonly used commercial services. Many businesses create wireless mesh networks that share unmetered residential and commercial cable and DSL Internet. The terms of service of regional internet service providers (ISPs) that offer their services through the duopoly of consumer phones and the line may not permit this kind of usage.
PV Roof Integration, a Case Study in Northern Italy: How Modules Arrangement Influences the PV Performance
Creators: name: Maturi, L.
name: Armani, M.
name: Bresciani, W.
name: Del Buono, M.
name: Sparber, W.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV and Architecture

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4256-4258
description: A typical problem of retrofit BIPV systems is the power loss due to the temperature increase because
the modules are often installed next to another surface. A way to decrease the temperature value of the module and
thus of the cell is to allow natural convection underneath the modules, leaving a gap between the PV system and the
other surface. The case study of a retrofit PV roof integration was analyzed and monitored. In order to understand the
influence of modules arrangement on temperature distribution, several simulations were carried out. The results show
that the distance between module arrays do not affect the temperature values in any significant way.
Results of the Project MULTIELEMENT – Visual Assessment of PV Module Quality
Creators: name: Funtan, P.
name: Misara, S.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV and Architecture

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4259-4264
description: According to high Photovoltaic (PV) system cost (especially PV Module) and the feed-in tariff in
several countries (especially for building integrated applications) along with numerous PV module manufacturers,
hence, the quality of the PV module is a major question for PV systems. With respect to standards of PV modules
(EN 61215 and EN 61646), these are not enough to evaluate the quality of PV module. In order to solve difficulties,
hence, the visual assessment of PV module quality is needed. For this work, we concentrated primarily on Building
Integrated Photovoltaic (BIPV) applications and only on glass substrates; glass-glass and glass-Tedlar. Our focuses
were on 5 different aspects: Inspection specification, Dimension of PV-module, Glass assessment, PV active cell
assessment, and electrical connection techniques. Nevertheless, standard PV module can also be partially evaluated
by this visual assessment of PV module quality. Finally, we are trying to set the first guideline for the visual
assessment of PV modules quality. This assessment allows the manufacturers to conform the quality of PV modules
and the planers to assess the quality of PV modules from the same assessment. Therefore, this visual assessment of
PV module quality will act as a quality benchmark PV module.
One or Two Axis PV Tracking? The Case Study of a 10kWp Tracking PV System Installed in Southern Italy
Creators: name: Graditi, G.
name: Cancro, C.
name: Merola, A.
name: Privato, 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; 4052-4056
description: Within the operating program aimed to on-site power generation, launched by Regione Campania
ENEA (Italian National Agency for New Technologies, the Energy and the Environment) realized a double axis
photovoltaic plant feeding an electrolyser for the hydrogen production. The facility is located in the Research Centre
of Portici near to Naples, in southern Italy. The PV generator is composed of 4 standard units of 2.4kWp each for a
total power of 9.6kWp at STC. The PV array includes 12 modules Sanyo Heterojunction with Intrinsic Thin layer
HIP-200NHE1 mounted on the double axis sun Deger Tracker 1600EL. The 10kW alkaline electrolyser for hydrogen
production, operating at atmospheric pressure, has been used. The focus of this work is to illustrate the PV plant
energetic performance during two working years (July 2006 - June 2008) performing, also, a comparative analysis
among PV installations of different kind, like flat system, single axis tracking systems. With regard to this a technical
and economical analysis aimed to evaluate the energetic advantages due to the use of tracking PV technology,
especially for installation sites located in southern Italy, has been carried out.
Nanoheteroepitaxial Structures for Solar Cells on Basis of GaP
Creators: name: Maronchuk, I.Y.
name: Berezovska, N.I.
name: Borkovskaya, O.Y.
name: Bykovskiy, S.Y.
name: Kulyutkina, T.F.
name: Mamontova, I.B.
name: Mamykin, S.V.
name: Maronchuk, A.I.
name: Maronchuk, I.I.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 421-424
description: The authors describe the method of obtaining of nanoheterostructures with quantum dots by liquid phase
epitaxy with pulse cooling of a substrate. The structures with Ge, InAs, QD grown inside of GaP p-n junction have been
prepared. Spectral dependencies of photoluminescence, and photocurrent as well as current-voltage characteristics were
applied for characterization.
The Development of High Performance TCO APCVD Processes for Photovoltaic Applications
Creators: name: Poodt, P.
name: Van Deelen, J.
name: Grob, F.
name: Theelen, M.
name: Winands, H.
name: Volintiru, I.
name: Van Mol, T.
name: Spee, K.
name: Kuypers, A.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 258-261
description: For the past decade TNO has been involved in the research and development of atmospheric pressure
CVD and plasma enhanced CVD processes for deposition of transparent conductive oxides, such as tin oxide and
zinc oxide. The use of atmospheric deposition processes allows for large scale roll to roll manufacturing, and is
therefore expected to provide a breakthrough for lowering the price of thin film PV modules.
Determination of the Effective Optical Width of Screen-Printed and Aerosol-Printed and Plated Fingers
Creators: name: Woehl, R.
name: Hörteis, M.
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; 1377-1382
description: One main efficiency loss in industrial solar cells is the shading of the cell due to the metal front side contacts. With the aerosol printing technique followed by a light induced plating (LIP) step, not only the geometrical contact is narrowed compared to screen-printed contacts but also the geometry of the finger changes. In this work the optical behaviour of different finger types is analysed with two different measurement methods. The analysis of the finger was carried out with both encapsulated fingers (module) and not encapsulated fingers (cell). The essential parameter for characterising the finger is the effective width which can be reduced drastically compared to the geometrical width due to total internal reflection at the glass-air layer and the direct reflection from the roundish edges of the contact fingers into the cell. This parameter was determined with different methods. The measured values are compared to a theoretical model for an aerosol-printed and plated finger and are in good agreement.
The catalytic thermo-oxidative decomposition of glimepiride using the isoconversional method
Creators: name: Riyaz, Najamus Sahar
name: Badran, Ismail
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Condensed matter physics
Physical chemistry

description: Applying the isoconversional method to data obtained from thermogravimetric analysis (TGA) can provide vital kinetic information. In this work, the thermal decomposition and oxidation of the antidiabetic drug glimepiride is analyzed in the presence of N2 and O2. The study was done with and without metal oxide catalysts to explore their potential application in solid wastewater upgrading. The analysis was conducted using thermogravimetric analysis. The isoconversional methods of Kissinger–Akahira–Sunose and Friedman were used to estimate the effective activation energies as a function of the extent of conversion (α). Density functional calculations were used to estimate the bond dissociation energies in glimepiride. The Ea values obtained from the Friedman method and the DFT calculations indicate an initial S–N bond breaking in glimepiride. The pre-exponential factor (A) and the kinetic triplet (ΔH‡, ΔS‡, and ΔG‡) are also discussed. When glimepiride oxidation was studied in the presence of the metal oxides, the catalyst activity was found to follow the order $${\text{VO}}_{{2}} > {\text{ CuO }} > {\text{ MnO}}_{{2}} > {\text{ Al}}_{{2}} {\text{O}}_{{3}} > {\text{ TiO}}_{{2}}$$ VO 2 > CuO > MnO 2 > Al 2 O 3 > TiO 2 .Other Information Published in: Journal of Thermal Analysis and Calorimetry
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10973-022-11304-9
A Route Toward the Optimized Optical and Electrical Properties of Silicon Quantum Dots/SiNx Composite Structures for Third Generation Solar Cell Applications
Creators: name: Rezgui, B.
name: Nychyporuk, T.
name: Sibai, A.
name: Bellet, D.
name: Poncet, A.
name: Maestre, D.
name: Palais, O.
name: Lemiti, M.
name: Bremond, 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; 415-417
description: Photoluminescence investigations were performed on amorphous silicon nitride (-SiNx) films
containing silicon quantum dots (Si QDs) prepared by plasma enhanced chemical vapour deposition with different
deposition parameters. It was found that the optimization of the plasma conditions such as plasma power, Ton and Toff
times are essential to the preparation of high density Si QDs. Metal-insulator-semiconductor devices were formed
using gold (Au) contact on the SiNx surface. Electronic properties have been investigated under light exposition and
photocurrent (PC) spectra have been obtained. Two main peaks located at 1.22 eV and 1.67 eV were observed and
were attributed to the confined carriers within two different size QDs. Moreover, the PC spectra show an increase of
the photogenerated current in the blue-UV range. The current density deduced from PC measurements was
extrapolated under equivalent solar flux (AM1.5) and was found to be ~ 5 μA.cm-2 for Si QDs spacing of 7 nm.
Testing Procedures for Building Integrated Photovoltaics
Creators: name: Weller, B.
name: Hemmerle, C.
name: Kothe, M.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV and Architecture

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4268-4271
description: Photovoltaic (PV) technology inspires architects to use this new and exiting building material to an
increasing degree. As laminated glass panels, PV modules can serve as glazing elements in order to complement or
substitute traditional façade or roof units. Yet, proving the applicability in terms of building regulations is a great
challenge. If, for example, the modules are applied as overhead glazing, approval procedures require experimental
tests, since their structure deviates from standard laminated safety glass. In several projects, the Institute of Building
Construction has developed appropriate testing methods for building integrated PV (BIPV). Tests according to
national and international glass classification standards were used and, if necessary, adapted. This article gives an
overview of material and component tests carried out as well as tests on original constructions. Recommendations for
the practical application are derived from the results.
Performance comparison of different flow arrangements of 4-fluid internally-cooled liquid desiccant dehumidifiers
Creators: name: Pakari, Ali
name: Ghani, Saud
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Condensed matter physics
Physical chemistry

description: In this study, the performance of 10 different flow arrangements of 4-fluid internally-cooled liquid desiccant dehumidifiers were compared. The four fluids are supply air, exhaust air, liquid desiccant, and water. The comparison was performed using a two-dimensional heat and mass transfer model of the dehumidifier that was solved numerically. The model’s predictions of supply air outlet humidity ratio matched experimental measurements within 6.7%. The two-dimensional variation of the air temperature and humidity ratio in the supply channel showed the importance of using a two-dimensional heat and mass transfer model when at least one of the fluids is in cross-flow with the other fluids. Moreover, a sensitivity analysis was performed to evaluate the effect of nine input parameters (supply air temperature and humidity ratio, exhaust air temperature and humidity ratio, liquid desiccant temperature, concentration, and flow rate, supply air mass flow rate, and exhaust to supply air mass flow rate ratio) on the performance of the dehumidifiers. The results showed that the best performance, in terms of the supply air humidity ratio and enthalpy decrease, was obtained when the supply air was in counter-flow with the exhaust air, liquid desiccant, and water. While the poorest performance was obtained when the supply air was in parallel-flow with the exhaust air and in counter-flow with the liquid desiccant and water. The approximate difference between the best and poorest performing flow arrangements in terms of the decrease in supply air humidity ratio and enthalpy is 4.3% and 10.5%, respectively. The results of the sensitivity analysis showed that for the 10 flow arrangements, the liquid desiccant inlet temperature, and flow rate have the least effects on the performance of the dehumidifier.Other Information Published in: Journal of Thermal Analysis and Calorimetry
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10973-022-11283-x
Fabrication and Characterization of Si Nanocrystals Embedded in SiC Matrix by Magnetron Sputtering for Third Generation Solar Cell Application
Creators: name: Gencer Imer, A.
name: Yildiz, I.
name: Karaman, M.
name: Turan, R.
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; 425-426
description: SiC containing with Si nanocrystals has been proposed as a promising material for the fabrication of third
generation solar cells. Since the bandgap of Si nanocrystals can be tuned by quantum size effect the solar spectrum can
effectively be absorbed by using Si nanocrystals embedded in the same solar cell device. In this study, Si rich SiC films
with different Si content have been prepared by RF magnetron sputtering and characterized by various diagnostic
techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, and Transmission Electron
Microscopy. SiC film properties and Si nanocrystal formation have been studied in terms of process parameters. It is
shown that well defined Si nanocrystals can be prepared in a stoichiometric SiC matrix with this technique.
Results of One-Week Workshop with Students in Architecture
Creators: name: Zanetti, I.
name: Nagel, K.
name: Panzera, G.
name: Galimberti, D.
name: Kaehr, P.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV and Architecture

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4216-4217
description: A one-week workshop was organized by ISAAC for students in architecture. The main objective was
to plan the refurbishment of a 40-year school by improving its energy efficiency and by restyling it, using building
integrated photovoltaic systems. The workshop was meant to introduce the PV (BiPV) technology into a practical
exercise that considers not only esthetic aspects, but also economic, electrical and technical issues. Students of
different semester were confronted with a task that, for time schedule and expected results, was similar to a realistic
architecture tender. The differences in perception and knowledge among students in architecture, their teachers and
the PV specialists were the main challenges to overcome.
Innovative BIPV Products Based on Adhesive Technology
Creators: name: Weller, B.
name: Hemmerle, C.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV and Architecture

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4272-4275
description: Architecturally, the conventional attachment of photovoltaic (PV) systems to buildings can often
generate aesthetically displeasing results. New innovative materials and techniques are needed to facilitate the widespread
use of building integrated PV façades further. Implementing and testing bonded joints in glass constructions is
a research focus at the Institute of Building Construction which also offers new opportunities in building integration
of PV modules – as laminated glass products as well as in combination with other building elements. The adhesive
bonding technique is an appropriate way to join the involved materials glass and metal. This paper discusses
fundamental questions to be addressed and presents the results of practical research on innovative PV façade systems.
First experiments with bonded back-rails help to estimate the potential of this mounting technique for future PV
façades.
An updated review of nanofluids in various heat transfer devices
Creators: name: Okonkwo, Eric C.
name: Wole-Osho, Ifeoluwa
name: Almanassra, Ismail W.
name: Abdullatif, Yasser M.
name: Al-Ansari, Tareq
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Condensed matter physics
Physical chemistry

description: The field of nanofluids has received interesting attention since the concept of dispersing nanoscaled particles into a fluid was first introduced in the later part of the twentieth century. This is evident from the increased number of studies related to nanofluids published annually. The increasing attention on nanofluids is primarily due to their enhanced thermophysical properties and their ability to be incorporated into a wide range of thermal applications ranging from enhancing the effectiveness of heat exchangers used in industries to solar energy harvesting for renewable energy production. Owing to the increasing number of studies relating to nanofluids, there is a need for a holistic review of the progress and steps taken in 2019 concerning their application in heat transfer devices. This review takes a retrospective look at the year 2019 by reviewing the progress made in the area of nanofluids preparation and the applications of nanofluids in various heat transfer devices such as solar collectors, heat exchangers, refrigeration systems, radiators, thermal storage systems and electronic cooling. This review aims to update readers on recent progress while also highlighting the challenges and future of nanofluids as the next-generation heat transfer fluids. Finally, a conclusion on the merits and demerits of nanofluids is presented along with recommendations for future studies that would mobilise the rapid commercialisation of nanofluids.Other Information Published in: Journal of Thermal Analysis and Calorimetry
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10973-020-09760-2
Finite current stationary states of random walks on one-dimensional lattices with aperiodic disorder
Creators: name: Miki, Hiroshi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Stationary states of random walks with finite induced drift velocity on one-dimensional lattices with aperiodic disorder are investigated by scaling analysis. Three aperiodic sequences, the Thue-Morse (TM), the paperfolding (PF), and the Rudin-Shapiro (RS) sequences, are used to construct the aperiodic disorder. These are binary sequences, composed of two symbols A and B, and the ratio of the number of As to that of Bs converges to unity in the infinite sequence length limit, but their effects on diffusional behavior are different. For the TM model, the stationary distribution is extended, as in the case without current, and the drift velocity is independent of the system size. For the PF model and the RS model, as the system size increases, the hierarchical and fractal structure and the localized structure, respectively, are broken by a finite current and changed to an extended distribution if the system size becomes larger than a certain threshold value. Correspondingly, the drift velocity is saturated in a large system while in a small system it decreases as the system size increases.
description: 16 pages, 13 figures
UNIVERSOL Project
Creators: name: Muñoz-Cerón, E.
name: De La Casa, J.
name: Ortega, M.J.
name: Almonacid, G.
name: Talavera, D.L.
name: Vidal, P.G.
name: Pérez-Higueras, P.
name: Gallego, J.
name: Martínez Ruiz, A.
name: Rubio Paramio, M.A.
name: Del Jesus, M.J.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV and Architecture

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4218-4222
description: The integration of grid-connected PV systems into buildings or public areas is one of the most usual
applications of the photovoltaic solar energy in developed countries. The University of Jaén (Spain) is a pioneering
public organism in the field of grid-connected PV systems, as it proves the milestones developed by its IDEA
research group in the last decades.
Recently, the University has proposed an ambitious project, the so-called UNIVERSOL project, where the
necessary tasks will be carried out in order to evaluate the “photovoltaic potential” of the Campus of the University.
This project is the previous step to convert this Campus in a big public area which combines the PV electricity
generation with the common uses of a university place, in other words, to create a mixed space where the generation
of knowledge can be combined with the electricity generation
A Detailed Performance Results of Grid-Connected PV System by Long-Term Field Test
Creators: name: So, J.H.
name: Hwang, H.M.
name: Yu, B.G.
name: Yoo, J.S.
name: Yu, G.J.
name: Choi, J.Y.
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; 4045-4047
description: As the PV market increases rapidly, the concerns of high quality and reliable photovoltaic (PV)
system have been increasing around the world. In the future, dissemination and technologies development for PV
system is the most important issues to establish usefulness of design, installation and maintenance with
performance improvement and reliability. This paper presents detailed performance analysis results of 80kW gridconnected
PV system by field test for two year or more. The performance and losses of PV systems are indicated
with quantitative value using monitoring data are reviewed.
Towards the Consolidation of a Photovoltaic Observatory in Wallonia and Brussels (Belgium)
Creators: name: Leloux, J.
name: Sala, G.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV and Architecture

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4226-4234
description: During the year 2008, the photovoltaic (PV) power connected to the grid in Wallonia and Brussels increased
from 200 kWp to 10 MWp. A complete production analysis was carried out from the data provided by 57 PV installations,
adding up to a peak power of about 200 kWp. On average, the PV systems analyzed are producing an annual energy that is
around 10% below the reference system. There are important uncertainties on key data, such as solar radiation and PV
systems production. Further studies are required, based on a larger amount of data. It would be essential to start collecting
data as soon as possible. The consolidation of a photovoltaic observatory could help in the accomplishment of this difficult
task. Interesting initiatives already exist. Over the course of the next months, the physical model used in the present work to
simulate the energy production of PV systems will be implemented on SolarWeb.be and be made accessible for free to the
public.
The VLA Nascent Disk and Multiplicity Survey: First Look at Resolved Candidate Disks around Class 0 and I Protostars in the Perseus Molecular Cloud
Creators: name: Segura-Cox, Dominique M.
name: Harris, Robert J.
name: Tobin, John J.
name: Looney, Leslie W.
name: Li, Zhi-Yun
name: Chandler, Claire
name: Kratter, Kaitlin
name: Dunham, Michael M.
name: Sadavoy, Sarah
name: Perez, Laura
name: Melis, Carl
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first dust emission results toward a sample of seven protostellar disk candidates around Class 0 and I sources in the Perseus molecular cloud from the VLA Nascent Disk and Multiplicity (VANDAM) survey with ~0.05'' or 12 AU resolution. To examine the surface brightness profiles of these sources, we fit the Ka-band 8 mm dust-continuum data in the u,v-plane to a simple, parametrized model based on the Shakura-Sunyaev disk model. The candidate disks are well-fit by a model with a disk-shaped profile and have masses consistent with known Class 0 and I disks. The inner-disk surface densities of the VANDAM candidate disks have shallower density profiles compared to disks around more evolved Class II systems. The best-fit model radii of the seven early-result candidate disks are R_c > 10 AU; at 8 mm, the radii reflect lower limits on the disk size since dust continuum emission is tied to grain size and large grains radially drift inwards. These relatively large disks, if confirmed kinematically, are inconsistent with theoretical models where the disk size is limited by strong magnetic braking to < 10 AU at early times.
description: 7 pages, 2 figures, 3 tables, accepted to ApJL
Challenges for Building Integrated PV in High-Rise Urban Environments - The Example of PV on Utrecht Central Station
Creators: name: Alsema, E.A.
name: Goud, J.M.
name: Kuil, J.W.
name: Unger, M.K.
Publisher: name: WIP-Munich
Year: 2009
Subjects: PV Systems
PV and Architecture

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4235-4240
description: A number of challenges and design issues for building-integrated PV in urban areas is investigated in general
and for a specific case study: a large railway station in Utrecht, The Netherlands. Because of the surrounding highrise
buildings that are already present around the station or that may be erected in the near future, shading loss could
become an important limiting factor for the installable PV potential. Detailed shading loss analyses were performed
for the area of the platform canopies and for the terminal roof. Yield reductions of more that 20% were observed for
some sections of the roof area and these section were further excluded from the potential estimate. Based on these
analyses a total installable PV potential of 647 kWp was found. In the end it has been proposed that the platform
canopies will be equipped with 149 kWp of semitransparent PV panels within the next six years.
Charge density waves in disordered media circumventing the Imry-Ma argument
Creators: name: Changlani, Hitesh J.
name: Tubman, Norm M.
name: Hughes, Taylor L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Two powerful theoretical predictions, Anderson localization and the Imry-Ma argument, impose significant restrictions on the phases of matter that can exist in the presence of even the smallest amount of disorder in one-dimensional systems. These predictions forbid conducting states and ordered states respectively. It was thus remarkable that a mechanism to circumvent Anderson localization relying on the presence of correlated disorder was found, that is also realized in certain biomolecular systems. In a similar manner, we show that the Imry-Ma argument can be circumvented resulting in the formation of stable ordered states with discrete broken symmetries in disordered one dimensional systems. Specifically, we simulate a family of Hamiltonians of spinless fermions with correlated disorder and interactions, where we find that a charge density wave is stable up to a finite critical disorder strength. Having circumvented the Imry-Ma mechanism, we then investigate other mechanisms by which disorder can destroy an ordered state.
description: 4+ pages, 4 figures. Supplemental (ancillary) information includes 3 pages, 4 figures
Perfil dos gestores dos repositórios institucionais e o seu olhar sobre a dinâmica dos mesmos
Creators: name: Ramos, Cecília
name: Jerónimo, Pedro
name: Rockembach, Moisés
Publisher: name: Zenodo
Year: 2022

description: Apresentação realizada na sessão O meu Póster em 40 segundos da 13ª Conferência Lusófona de Ciência Aberta, formato híbrido, de 10 a 12 de outubro de 2022.
An intelligent approach to predicting the effect of nanoparticle mixture ratio, concentration and temperature on thermal conductivity of hybrid nanofluids
Creators: name: Wole-Osho, Ifeoluwa
name: Okonkwo, Eric C.
name: Adun, Humphery
name: Kavaz, Doga
name: Abbasoglu, Serkan
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Condensed matter physics
Physical chemistry

description: Hybrid nanofluids are better heat transfer fluids than conventional nanofluids because of the combined properties of two or more nanoparticles. In this study, the thermal conductivity of Al2O3–ZnO nanoparticles suspended in a base fluid of distilled water is investigated. The experiments were conducted for three mixture ratios (1:2, 1:1 and 2:1) of Al2O3–ZnO nanofluid at five different volume concentrations of 0.33%, 0.67%, 1.0%, 1.33% and 1.67%. X-ray diffractometric analysis, X-ray fluorescence spectrometry and scanning electron microscopy were used to characterise the nanoparticles. The highest thermal conductivity enhancement achieved for Al2O3–ZnO hybrid nanofluids with 1:2, 1:1 and 2:1 (Al2O3:ZnO) mixture ratios was 36%, 35% and 40%, respectively, at volume concentration 1.67%. The study observed the highest thermal conductivity for Al2O3–ZnO nanofluid was achieved at a mixture ratio of 2:1. A “deeping” effect was observed at a mixture ratio of 1:1 representing the lowest value of thermal conductivity within the considered range. The study proposed and compared three models for obtaining the thermal conductivity of Al2O3–ZnO nanofluids based on temperature, volume concentration and nanoparticle mixture ratio. A polynomial correlation model, the adaptive neuro-fuzzy inference system model and an artificial neural network model optimised with three different learning algorithms. The adaptive neuro-fuzzy inference system model was most accurate in forecasting the thermal conductivity of the Al2O3–ZnO hybrid nanofluid with an R2 value of 0.9946.Other Information Published in: Journal of Thermal Analysis and Calorimetry
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10973-020-09594-y
The guild – Innovative workplace learning in nursing education towards a sustainable workforce
Creators: name: Van Wijlen, Annita
name: Roelofs, Pepijn
name: Vrieling, Martine
name: Finnema, Evelyn
Publisher: name: F1000 Research Limited
Year: 2023

description: Background
 The University Medical Center Groningen (UMCG), an academic tertiary hospital in the North of the Netherlands, joined efforts with three Vocational Secondary Schools in the city of Groningen to form a guild and expand the number of trainees positions for nurses at the UMCG.

 Aim and research question
 The main aims of the UMCG Guild are 1) to offer an appealing, sustainable and high-quality training course for secondary vocational students, complying with the UMCG values as guiding principles, 2) to increase the number of trainee positions in the UMCG and 3) to decrease dropout rate.
 The research question was: How do stakeholders assess the UMCG-Guild learning program?

 Method
 A joined innovative practice-oriented curriculum for nursing students was developed, transferring the overall training from school to the hospital. Also, the number of trainee positions was increased. Intensive cooperation between lecturers and nurses encourages knowledge sharing, which has created safe and challenging learning environments.
 Data were collected through classroom evaluations, an open questionnaire among all stakeholders (students, nurses, management, lecturers) and tracking and evaluating dropout.

 Results
 In 2021 the first 32 students graduated. Dropout during the two-year program was 8.6% (previous years 20-40%).
 All stakeholders experienced benefits: schools obtained more trainee positions, teachers experienced more commitment to the internships, students experienced more connection between theory and practice, and the UMCG trained and retained more nurses. Over 90% of the graduates have obtained a job at the UMCG. Students graduated from the Guild are high in demand and continue to work in the hospital.
 Many of them have since completed advanced training, such as a bachelor's degree or specialization.

 Conclusion
 The objectives of the UMCG-Guild have been achieved. Follow-up research studying didactic components and satisfaction of all stakeholders is planned for the coming years.

 Take home message
 More nursing students can be trained, and less will drop out, when the hospital and schools start collaborating closely in a joint curriculum.
Thick Film Contact Paste for Silicon Solar Cells With B-Doped Emitter
Creators: name: Mikhitaryan, V.
name: Garanzha, S.
name: Schalko, N.
name: Vityuk, S.
name: Zaks, M.
name: Sitnikov, A.
name: Solodukha, O.
name: Tikhonov, A.
name: Colomoetz, 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; 1364-1366
description: Necessity for a further increasing of conversion efficiency of silicon solar cells stimulates development of new,
more effective, in comparison with traditional, cell designs. Thus obvious possibilities are connected with bifacial cells. One
of the factors limiting efficiency of silicon solar cells with bifacial sensitivity is non-optimized contact to thin p+ - emitter
layer. In this paper we present experimental results related to formulation of contact paste for B-doped ‘rear’ emitter in n+pp+
bifacial cells with hybrid (screen printing + additional metal electroplating) metallization. The study was focused on effect of
Al doping on main thick film contact electrical parameters. It is shown, that application of newly developed paste enables
fabrication of bifacial solar cells with efficiency over 17 %.
Comparative experimental and modelling study of the thermal and thermo-mechanical properties of LLDPE/wax blends
Creators: name: Mosoabisane, Mafereka F. T.
name: Luyt, Adriaan S.
name: van Sittert, Cornelia G. C. E.
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Organic chemistry
Macromolecular and materials chemistry

description: The interactions and morphology of molecules in a polymer blend influence the physical properties of the blend. However, little is known about the influence of molecular interaction and morphology on the thermal and mechanical properties of LLDPE/wax blends. Although cooling rate can be used to investigate blends' thermal and mechanical properties, it is inadequate to determine interactions between the molecules in the LLDPE/wax blends. However, since the morphology is related to the thermal and mechanical properties of polymer blends and could be related to the cooling rate, LLDPE/wax samples prepared by melt mixing were cooled at different rates. The thermal and mechanical properties of the LLDPE/wax blends were modelled through molecular dynamic simulations. The modelled transitions were compared to experimentally determined mechanical relaxations of LLDPE/wax blends to investigate the effect of wax addition on the blend crystallinity. The crystallization behaviour of the blends was studied by differential scanning calorimetry, dynamic mechanical behaviour by dynamic mechanical analysis, and differences in crystallinity by X-ray diffraction. There were no significant differences between the results for the slow- and quench-cooled samples, confirming the rapid crystallization of both the LLDPE and the wax. Experiments and molecular dynamics simulations confirmed the cocrystallization of wax with LLDPE.Other Information Published in: Journal of Polymer Research
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10965-022-03136-w
Best Practice for Minority-Carrier Lifetime Measurements of Si Wafers
Creators: name: Sinton, R.A.
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; 1367-1369
description: Over the past 15 years, a broad consensus has developed in the R&D community on best practice for minoritycarrier lifetime testing that permits the lifetime to be measured at laboratories worldwide with very good agreement. The basic requirements are well understood and simple to describe. A critical factor is the specification of the carrier density at which the lifetime is reported. As reviewed in this paper, a variety of measurement techniques and instruments exist that follow the established best practice and provide meaningful, consistent data. In contrast, pre-standards for minority-carrier
lifetime measurement published in June 2007 by DKE/DIN differ from the commonly accepted best practice in several important ways. This paper discusses the differences and similarities between these pre-standards and the specifications generally accepted in the R&D and industrial community.
The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation
Creators: name: Juber, Fadel Abdul Hadi
name: Jawad, Zeinab Abbas
name: Chin, Bridgid Lai Fui
name: Yeap, Swee Pin
name: Chew, Thiam Leng
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Organic chemistry
Macromolecular and materials chemistry

description: Carbon dioxide (CO2) emissions have been the root cause for anthropogenic climate change. Decarbonisation strategies, particularly carbon capture and storage (CCS) are crucial for mitigating the risk of global warming. Among all current CO2 separation technologies, membrane separation has the biggest potential for CCS as it is inexpensive, highly efficient, and simple to operate. Polymeric membranes are the preferred choice for the gas separation industry due to simpler methods of fabrication and lower costs compared to inorganic or mixed matrix membranes (MMMs). However, plasticisation and upper-bound trade-off between selectivity and permeability has limited the gas separation performance of polymeric membranes. Recently, researchers have found that the blending of glassy and rubbery polymers can effectively minimise trade-off between selectivity and permeability. Glassy poly(ethersulfone) (PES) and rubbery poly(ethylene) glycol (PEG) are polymers that are known to have a high affinity towards CO2. In this paper, PEG and PES are reviewed as potential polymer blend that can yield a final membrane with high CO2 permeance and CO2/nitrogen (N2) selectivity. Gas separation properties can be enhanced by using different solvents in the phase-inversion process. N-Methyl-2-Pyrrolidone (NMP) and Dimethylformamide (DMF) are common industrial solvents used for membrane fabrication. Both NMP and DMF are reviewed as prospective solvent blend that can improve the morphology and separation properties of PES/PEG blend membranes due to their effects on the membrane structure which increases permeation as well as selectivity. Thus, a PES/PEG blend polymeric membrane fabricated using NMP and DMF solvents is believed to be a major prospect for CO2/N2 gas separation.Other Information Published in: Journal of Polymer Research
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10965-021-02500-6
Investigation of Thermally Induced Phase Separation in PECV-Grown Silicon Nitride
Creators: name: Mercaldo, L.V.
name: Esposito, E.M.
name: Delli Veneri, P.
name: Lancellotti, L.
name: Privato, C.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Advanced Photovoltaics
New Materials, Cells and Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 411-414
description: Silicon nanostructures embedded in dielectric matrix have interesting possible applications in third
generation photovoltaics. The fabrication techniques usually involve high-temperature post-deposition treatments.
The possibility of reducing the annealing temperature and time deserves to be explored in view of extending the
application of such innovative materials within classical thin film silicon architectures on low cost substrates. Here
we report on the effect of short (≤ 10 min) thermal treatments (temperature range 600-1050°C) on amorphous silicon
nitride films deposited by plasma enhanced chemical vapour deposition (PECVD) at 300°C on silicon wafers and
quartz substrates. A final longer (1 h) treatment at 1100°C has been also applied. The evolution of Raman spectra,
photoluminescence, and optical absorption with annealing temperature has been investigated on two samples with
different silicon content. For the silicon rich material partial phase separation is present already in the as-grown
condition. Rearrangement of bonds is evidenced with the thermal treatments, with formation of crystalline silicon
nanoparticles only after the highest temperature annealing step.
Enhanced image feature coverage: Key-point selection using genetic algorithms
Creators: name: Bostanci, Erkan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Coverage of image features play an important role in many vision algorithms since their distribution affect the estimated homography. This paper presents a Genetic Algorithm (GA) in order to select the optimal set of features yielding maximum coverage of the image which is measured by a robust method based on spatial statistics. It is shown with statistical tests on two datasets that the metric yields better coverage and this is also confirmed by an accuracy test on the computed homography for the original set and the newly selected set of features. Results have demonstrated that the new set has similar performance in terms of the accuracy of the computed homography with the original one with an extra benefit of using fewer number of features ultimately reducing the time required for descriptor calculation and matching.
description: 14 pages, journal
On Indefinite Quadratic Optimization over the Intersection of Balls and Linear Constraints
Creators: name: Almaadeed, Temadher A.
name: Ansary Karbasy, Saeid
name: Salahi, Maziar
name: Hamdi, Abdelouahed
Publisher: name: Manara - Qatar Research Repository
Year: 2022
Subjects: Applied mathematics

description: In this paper, we study the minimization of an indefinite quadratic function over the intersection of balls and linear inequality constraints (QOBL). Using the hyperplanes induced by the intersection of each pair of balls, we show that the optimal solution of QOBL can be found by solving several extended trust-region subproblems (e-TRS). To solve e-TRS, we use the alternating direction method of multipliers approach and a branch and bound algorithm. Numerical experiments show the efficiency of the proposed approach compared to the CVX and the extended adaptive ellipsoid-based algorithm.Other Information Published in: Journal of Optimization Theory and Applications
 License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10957-022-02018-x