cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Thermalization and many-body localization in systems under dynamic nuclear polarization
Creators: name: De Luca, Andrea
name: Arias, Inés Rodríguez
name: Müller, Markus
name: Rosso, Alberto
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the role of dipolar interactions in the standard protocol used to achieve dynamic nuclear polarization (DNP). In the so-called spin-temperature regime, where the interactions establish an effective thermodynamic behavior in the out-of-equilibrium stationary state, we provide numerical predictions for the level of hyperpolarization. We show that nuclear spins equilibrate to the effective spin-temperature established among the electron spins of radicals, as expected from the quantum theory of thermalization. Moreover, we present an analytical technique to estimate the spin temperature, and thus, the nuclear hyperpolarization in the steady state, as a function of interaction strength and quenched disorder. This reproduces both our numerical data and experimental results. Our central finding is that the nuclear hyperpolarization increases steadily upon reducing the interaction strength (by diluting the radical density). Interestingly, the highest polarization is reached at a point where the establishment of a spin temperature is just about to break down due to the incipient many-body localization transition in the electron spin system.
description: 12 pages (+ 3 pages of appendix), 8 figures
Hybrid PV-Wind-Renewable Methane Power Plants – A Potential Cornerstone of Global Energy Supply
Creators: name: Breyer, C.
name: Rieke, S.
name: Sterner, M.
name: Schmid, J.
Publisher: name: WIP
Year: 2011
Subjects: PV Taking Off: Large-Scale Deployment
Large Scale Grid Integration and Smart Grids

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4594-4606
description: A 100% renewable power supply on a low cost basis is prerequisite for a sustainable global development. Solar and
wind resources are abundantly available on earth enabling the use of photovoltaic (PV) and wind energy technologies
on a large scale in most regions in the world. This paper aims at investigating a global energy supply scenario based
of PV and wind power supported by an appropriate energy storage infrastructure. First results for the degree of
complementarity of PV and wind power supply are presented and the need of appropriate energy storage solutions is
discussed. We present the renewable power methane (RPM) storage option and discuss the various integration
options of hybrid PV-Wind-RPM power plants. Based on the levelized cost of electricity (LOCE) approach and on
cost assumptions for the year 2020, hybrid PV-Wind-RPM power plant economics are derived on a global scale and
discussed in more detail for an exemplary site in China. First estimates for the global energy supply potential of
hybrid PV-Wind-RPM power plants show both, rapidly increasing competitiveness and low distances between the
centres of demand and least cost energy supply, which is complemented by abundant resource availability. In
conclusion, hybrid PV-Wind-RPM power plants are a potential cornerstone of the global energy supply in the next
decades.
Investigation of a PECVD Silicon Oxide/Silicon Nitride Passivation System Concerning Process Influences
Creators: name: Keipert-Colberg, S.
name: Barkmann, N.
name: Streich, C.
name: Schütt, A.
name: Suwito, D.
name: Schäfer, P.
name: Müller, S.
name: Borchert, D.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1770-1773
description: In this work we investigated the properties of silicon oxide (SiOy) and silicon nitride (SiNx) layers
deposited by a large area 13.56 MHz PECVD system as well as of the combined SiO-SiN “stack”.
The bonding nature of the layers was determined by FTIR spectroscopy. Furthermore, a characterization of the
interface trap density as well as of the fixed charges in the different passivating layers was performed by preparing
and measuring metal-insulator-semiconductor samples and supplemented by lifetime measurements. We
show how temperature steps as well as x-ray and UV-radiation change the layer properties: High energetic
radiation leads to a depassivation of the surface deposited with the SiO-SiN stack. The low surface recombination
velocity can be fully recovered by an annealing step. In addition, rear side passivated solar cells were fabricated
with a SiO-SiN stack as passivation layer and the rear surface recombination velocity of the solar cells was
measured by the CELLO technique.
Comparison of Network Analysis Approaches on EEG Connectivity in Beta during Visual Short-Term Memory Binding Tasks
Creators: name: Smith, Keith
name: Azami, Hamed
name: Parra, Mario A.
name: Escudero, Javier
name: Starr, John M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: We analyse the electroencephalogram signals in the beta band of working memory representation recorded from young healthy volunteers performing several different Visual Short-Term Memory (VSTM) tasks which have proven useful in the assessment of clinical and preclinical Alzheimer's disease. We compare network analysis using Maximum Spanning Trees (MSTs) with network analysis obtained using 20% and 25% connection thresholds on the VSTM data. MSTs are a promising method of network analysis negating the more classical use of thresholds which are so far chosen arbitrarily. However, we find that the threshold analyses outperforms MSTs for detection of functional network differences. Particularly, MSTs fail to find any significant differences. Further, the thresholds detect significant differences between shape and shape-colour binding tasks when these are tested in the left side of the display screen, but no such differences are detected when these tasks are tested for in the right side of the display screen. This provides evidence that contralateral activity is a significant factor in sensitivity for detection of cognitive task differences.
description: Proceeds from the IEEE Engineering in Medicine and Biology Conference 2015
Toric ideals of simple surface singularities
Creators: name: Kaya, Gülay
name: Mete, Pınar
name: Şahin, Mesut
Publisher: name: arXiv
Year: 2015
Subjects: subject: Commutative Algebra (math.AC)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: Primary: 14M25, 13A50, Secondary: 32S45, 15C25

description: In this paper, we study a class of toric ideals obtained by using some geometric data of ADE trees which are the minimal resolution graphs of rational surface singularities. We compute explicit Gröbner bases for these toric ideals that are also minimal generating sets consisting of large number of binomials of degree $\leq 4$. In particular, they give rise to squarefree initial ideals as well.
Actuation, Control, and Customization: Key Elements Toward Real-world Deployment of Powered Exoskeleton Systems
Creators: name: Lee, Ung Hee
Publisher: name: My University
Year: 2022
Subjects: subject: Actuation, Control, and Customization: Key Elements Toward Real-world Deployment of Powered Exoskeleton Systems
subject: Biomedical Engineering
subject: FOS: Medical engineering
subject: Engineering

description: Lower limb robotics holds a potential to transform human mobility by assisting locomotor activities. Especially, robotic exoskeletons which assist lower limbs by offloading the body from weight, can enable people to walk and run farther with less effort, and carry heavy loads. Despite the promise of wearable technologies, we don't often see these devices in daily life. I argue that there is a gap in how we design and control robotic systems. To close this gap, I focus on three key elements: actuation, control, and customization. First, I characterize a high-performance brushless DC (BLDC) motor, which is an emerging actuation system for lightweight and efficient robots. Second, I expand upon my first work, and provide a tutorial for robot designers who want to utilize these emerging motors for their robotic applications. This includes a consolidated set of governing equations for modeling BLDC motors, and common mistakes from designers when interpreting specifications provided by motor manufacturers. Third, I transition to the control aspect, I describe an online customization framework by optimizing user preference for controlling robotic exoskeleton. Lastly, I present an intent recognition system which predicts users' intent ahead of time, allowing seamless control across multiple activities. With these key elements being addressed, my dissertation lays the groundwork for translating these technologies outside of the lab, in the real world.
Improved Multicrystalline Silicon Wafer Texturisation by Plasma Etching
Creators: name: Jourdan, J.
name: Mialon, S.
name: Loretz, J.C.
name: Crampette, L.
name: Monna, R.
name: Barbier, F.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1774-1778
description: Surface texturing enhances the photon absorption and removes the saw damage layer. For randomly
oriented grains silicon, isotropic dip in HF/HNO3 mixture is currently a standard process. Important is that isotexture
occurs on both sides and has a high de-ionized water consumption. However, it is well accepted that polished rear
surface and reflectivity losses become even more relevant to reach high efficiency solar cells. Increasing solar cell
efficiencies implies a decoupling treatment of rear and front sides.
The purpose of this work was to develop an alternative to the well established isotexture process. This has been done
by combining a wet etching with a plasma process and a specific plasma chamber was been designed. The texturing
process thereby developed was then successfully implemented in a solar cell process. Surface characterizations
underlined that no plasma damages occur during this texturing process. Solar cells results exhibit an increase in short
circuit current density and no drop in open circuit voltage. This lead to a gain efficiency for plasma texturing process
compared to the standard texture process (alkaline or acidic).
Impact of Gas Ambient on the Quality of Screen-Printed Boron Emitters
Creators: name: Uzum, A.
name: Hamdi, A.
name: Nagashima, S.
name: Suzuki, S.
name: Suzuki, H.
name: Yoshiba, S.
name: Dhamrin, M.
name: Kamisako, K.
name: Sato, H.
name: Katsuma, K.
name: Kato, K.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1779-1782
description: The impact of gas ambient on the quality of screen-printed boron emitters was investigated. Textured
n-type mc and CZ silicon wafers with a surface area of 5x5 cm2 were used. Boron diffusion paste was screen-printed
on the front surface of the wafers and diffused in a conventional furnace at different peak temperatures of 900 oC and
950 oC for duration of 30 min in N2, N2+O2, Ar and O2 ambient. The average sheet resistance was higher in O2
ambient because of oxidation of boron in the boron silicate glass films. In Ar ambient, the standard deviation of the
whole wafer surface sheet resistances was lower than N2 and O2 ambient. Significant improvement of carrier lifetimes
was observed for all CZ and mc-Si n-type wafers diffused in N2, Ar and N2+O2 ambients both at 900 oC and at 950 oC
for 30 min. The average lifetime of CZ n-type wafers after boron diffusions at 900 oC and 950 oC increased to reach
230 and 299 s, respectively.
Electric Mobility and Photovoltaics - The Low Voltage Grid on the Way to Energy Autonomy?
Creators: name: Vetter, M.
name: Schwunk, S.
name: Merten, J.
name: Barruel, F.
name: Wiss, O.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
Engineering and System Integration

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3135-3143
description: Today’s discussion about electric mobility contains a vision of dual use of battery storages in electric
vehicles or in plug-in hybrid vehicles. On the one hand renewable energies provide a possibility for zero emission
transportation; on the other hand the storages give the possibility to store fluctuating energy from the renewable
power sources. Within this paper decentralized PV systems feeding into the low voltage grid and pure electric
vehicles are considered. The approach contains two steps. First a system model of a low voltage grid with a huge
fraction of electric vehicles and a 200 kWp PV generator is set up. With this system model a simulation study is
carried out considering four different operating control scenarios. Whereas the first three scenarios are based on
moderate assumptions, the fourth scenario describes an extreme case targeting a maximum degree of energy
autonomy in the low voltage grid. The second step contains the “Solar Mobility” concept developed at INES, which
seeks a synergy between electric vehicles, electricity grid, and PV generators. First demonstration of this concept
with two electric cars and a solar car park is presented. In order to maximize the solar share of the vehicle charging
needs for further developments are identified. The results of the simulation study and the results of the demonstration
site show a need for optimized energy management systems, which determine the state of charge of the vehicles.
Furthermore, vehicle chargers are needed which are able to cope with the fluctuations of the PV generation and
which are able to adapt the charging power to the available PV power. Besides these topics one of the key questions
today is the ageing of battery storages in the described scenarios. Therefore stress factors for the batteries have to be
considered.
Presentation on Open Source Learning
Creators: name: Kulkarni, Prajot
Publisher: name: Zenodo
Year: 2020
Subjects: Open source learning(OSL)
massive open online courses(MOOC)
STEM education

description: Using the free open source software available, an open repository site can be built for adding notes and materials for students. MOOC can be added to this site, so that the students can pursue the knowledge they wish. STEM educators can take advantage of this open source information and can make the necessary changes and can add new information to the platform. Students and professors spend a lot of time in accumulating and preparing material, this times can be saved with the help of this platform. Cost of the hardware is reducing and use of the software is increasing, with the help of technology we can build a platform for all the students, professors and STEM educators. The platform built can can be monitored by a mutually formed community. Some proper structure and guidelines are required for smooth functioning of this system, these are discussed in the following sections of the paper.
Linear and Optimization Hamiltonians in Clustered Exponential Random Graph Modeling
Creators: name: Park, Juyong
name: Yook, Soon-Hyung
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Exponential random graph theory is the complex network analog of the canonical ensemble theory from statistical physics. While it has been particularly successful in modeling networks with specified degree distributions, a naive model of a clustered network using a graph Hamiltonian linear in the number of triangles has been shown to undergo an abrupt transition into an unrealistic phase of extreme clustering via triangle condensation. Here we study a non-linear graph Hamiltonian that explicitly forbids such a condensation and show numerically that it generates an equilibrium phase with specified intermediate clustering.
description: 8 pages, 6 figures
Die Reformbewegungen auf dem Gebiete der Liturgie, der Frömmigkeit, des kanonischen Rechts, die in Synode von Pistoja zum Ausdruck kamen
Creators: name: Rosa, Mario
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 2 Nr. 7 (1966): Concilium: Internationale Zeitschrift für Theologie, Band 2, Heft 7
Characterisation of Laser Edge Isolation by Ultrashort Laser Pulses
Creators: name: Juzumas, V.
name: Janusonis, J.
name: Sulinskas, K.
name: Andrijauskas, D.
name: Cyras, V.
name: Pakalka, S.
name: Isciukiene, A.
name: Gurklys, R.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1791-1795
description: Laser edge isolation of solar cells has to be improved in order to increase solar cell efficiency. Long
nanosecond laser pulses are usually applied for laser edge isolation in industry. However, stable solid state lasers
which emit ultrashort pulses are now available and allow much more precise damage-free groove fabrication.
Femtosecond UV (=343 nm) pulses are applied in this work and show great potential for fabricating grooves
without any successive chemical treatment.
Evolutionary PV-Module Production - from a Production Cell to an Integrated, Fully Automated Production Line
Creators: name: Gerold, L.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
PV Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3590-3591
description: The approach suggested by GEROLD will device an engineering concept which allows the PV-module
producer to start with autarkic production cells to perfectly control and refine the individual process steps in module
production before linking such cells to an integrated, fully automated module production line. What is the scientific
innovation and relevance? Manual processes and production steps are translated into autarkic production cells. The
automated production cells permit active setting, monitoring and adjustment of process parameters. Examples
brought to the market are e.g. edge trimming cells, quality control cells, automated framing cells. Over time, and as
the process and module production mature, the individual production cells are fully automated by integrating
industrial robots. By linking former cells with appropriate handling equipment and automation, fully automated,
integrated module production lines are set up. Process monitoring and data management are permitted by means of
appropriate computer and visualization systems.
Energy Management System for a Photovoltaic Grid-Connected Building
Creators: name: Ha, D.L.
name: Ploix, S.
name: Wurtz, F.
name: Perichon, P.
name: Merten, J.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
Engineering and System Integration

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3144-3148
description: This paper proposes a system for the global home energy management, which adjusts the electric energy
consumption and production for the building. The available flexibilities of the services provided by domestic appliances are
used to compute optimal planning for appliance controls. Three optimization criteria are used: the user's comfort, the
economic cost and the CO2 equivalent rejection. A three layers control approach is used to first compute
consumption/production coordination plans and then to dynamically adjust the computed plan to actual
consumption/production data. Application examples are given.
Conservative dissipation: How important is the Jacobi identity in the dynamics?
Creators: name: Caligan, Cameron
name: Chandre, Cristel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Hamiltonian dynamics are characterized by a function, called the Hamiltonian, and a Poisson bracket. The Hamiltonian is a conserved quantity due to the anti-symmetry of the Poisson bracket. The Poisson bracket satisfies the Jacobi identity which is usually more intricate and more complex to comprehend than the conservation of the Hamiltonian. Here we investigate the importance of the Jacobi identity in the dynamics by considering three different types of conservative flows in R3 : Hamiltonian, almost-Poisson and metriplectic. The comparison of their dynamics reveals the importance of the Jacobi identity in structuring the resulting phase space.
LCoE Analysis as a Decision Tool for Design of Concentrated Photovoltaics Systems
Creators: name: Filipa, F.
name: Pina, L.
name: Wemans, J.
name: Sorasio, G.
name: Brito, M.C.
Publisher: name: WIP
Year: 2011
Subjects: PV Taking Off: Large-Scale Deployment
Markets for Large-scale PV

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4581-4583
description: This paper presents a Levelized Cost of Electricity (LCoE) model that was firstly developed for
conventional photovoltaic (PV) modules integrated in four different PV configurations: fixed; tracking (1-axis and 2-
axes); and concentrated photovoltaic (CPV) systems, the DoubleSun® technology. Such analysis highlighted that as
the complexity of the PV system increases (e.g. tracking structures, optics, etc.) additional costs appear and the
relative relevance of the module cost decreases. However, a significant decrease of the cost of standard modules may
reduce the advantage of other configurations as to the conventional flat plate, suggesting the need for higher
concentration levels. Thus, the LCoE analysis was then used as an auxiliary design tool for the development of the
new HSUN concept, a new medium CPV system that is being developed by WS Energia. By establishing the target of
grid parity, the model has pointed out that the optimum level of concentration for a new CPV technology, the HSUN
concept, must lie within 15-20 suns.
Measures to Accompany PV Applications to the Grid Parity and Beyond: The PV Parity Project
Creators: name: Weiss, I.
name: Caneva, S.
name: Arancón, S.
name: Helm, P.
name: Despotou, E.
name: Masson, G.
name: Concas, G.
name: Sinke, W.
name: Olson, C.
name: Tsoutsos, T.
name: Tournaki, S.
name: Pause, F.
name: De Mango, F.
name: Dalla Chiesa, C.
name: Strbac, G.
name: Pudjianto, D.
name: Auer, H.
name: Lettner, G.
name: Montoya, C.
name: Declercq, R.
Publisher: name: WIP
Year: 2011
Subjects: PV Taking Off: Large-Scale Deployment
Large Scale Grid Integration and Smart Grids

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4590-4593
description: Over the past years, the PV market has experienced significant growth rates worldwide. Large-scale
investments as well as market growth in general resulted in improved system performance and reduced operation
costs; hence power production costs are decreasing continuously. Market growth is largely policy-driven and depends
on the support through favourable legal frameworks and support programmes such as feed-in tariffs, at least until the
supported technology reaches grid parity, i.e. becomes cost competitive with conventional power generation systems.
Financial support schemes are generally aiming at reaching grid parity which allows for lowering and finally stopping
the support. In order to achieve this goal in a cost-efficient way, it is necessary to understand how grid parity is
defined, which support schemes are best suited to achieve grid parity and which support is appropriate and needed
after reaching grid parity. This paper focuses on the first results towards the definition of the PV grid parity obtained
during the first part of the PV Parity project. This paper provides the methodology applied for the definition of the
electricity market segments, which represent the “competitors” of PV electricity at different levels of installed PV
power, and electricity prices for different market segments and their disaggregated cost components in selected
European countries. The PV Parity project started in June 2011 and will end in May 2014. The PV Parity project is
co-financed by the European Commission in the framework of the Intelligent Energy Europe (IEE) Program.
Equations defining recursive extensions as set theoretic complete intersections
Creators: name: Nhan, Tran Hoai Ngoc
name: Şahin, Mesut
Publisher: name: arXiv
Year: 2015
Subjects: subject: Commutative Algebra (math.AC)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M10, 14M25, 14H45

description: Based on the fact that projective monomial curves in the plane are complete intersections, we give an effective inductive method for creating infinitely many monomial curves in the projective $n$-space that are set theoretic complete intersections. We illustrate our main result by giving different infinite families of examples. Our proof is constructive and provides one binomial and $(n-2)$ polynomial explicit equations for the hypersurfaces cutting out the curve in question.
Sources of Quasi-Periodic Pulses in the 18 August 2012 Flare
Creators: name: Altyntsev, A.
name: Meshalkina, N.
name: Meszarosova, H.
name: Karlicky, M.
name: Palshin, V.
name: Lesovoi, S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We analyzed spatial and spectral characteristics of quasi-periodic pulses (QPP) for the 18 August 2012 limb are, using new data from a complex of spectral and imaging instruments developed by the Siberian Solar Radio Telescope team and the Wind/Konus gamma-ray spectrometer. A sequence of broadband pulses with periods of approximately ten seconds were observed in X-rays at energies between 25 keV and 300 keV, and in microwaves at frequencies from a few GHz up to 34 GHz during an interval of one minute. The QPP X-ray source was located slightly above the limb where the south legs of large and small EUV loop systems were close to each other. Before the QPPs the soft X-ray emission and the Ramaty High Energy Solar Spectroscopic Imager signal from the energy channels below 25 keV were gradually arising for several minutes at the same location. It was found that each X-ray pulse showed the soft-hard-soft behavior. The 17 and 34 GHz microwave source were at footpoints of the small loop system and the source emitting in the 4.2 {7.4 GHz band in the large one. The QPPs were probably generated by modulation of acceleration processes in the energy release site. Analyzing radio spectra we determined the plasma parameters in the radio sources. The microwave pulses could be explained by relatively weak variations of the spectrum hardness of emitting electrons.
description: in press, Solar Physics, 2016
Couplings between QCD axion and photon from string compactification
Creators: name: Kim, Jihn E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The QCD axion couplings of various invisible axion models are presented. In particular, the exact global symmetry U(1)$_{\rm PQ}$ in the superpotential is possible for the anomalous U(1) from string compactification, broken only by the gauge anomalies at one loop level, and is shown to have the resultant invisible axion coupling to photon, $c_{aγγ}\ge \frac83-c_{aγγ}^{\rm ch\,br}$ where $c_{aγγ}^{\rm ch\,br}\simeq 2$. However, this bound is not applicable in approximate U(1)$_{\rm PQ}$ models with sufficiently suppressed U(1)$_{\rm PQ}$-breaking superpotential terms. We also present a simple method to obtain $c_{aγγ}^0$ which is the value obtained above the electroweak scale.
description: 8 pages, 2 figures
Optimization of Screen-Printing Conditions for Multicrystalline Silicon Solar Cells Fabrication
Creators: name: Kobayashi, K.
name: Dhamrin, M.
name: Someya, T.
name: Suzuki, S.
name: Nagashima, S.
name: Kamisako, K.
name: Okamoto, S.
name: Nakatani, Y.
name: Sato, K.
name: Ishikawa, N.
name: Iida, H.
name: Muramatsu, K.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1762-1765
description: The effects of screen-printing and firing conditions were investigated in order to optimize the solar cell
metallization. The shape of squeegee strongly influences the weight of deposited paste and solar cell output
characteristics. The conversion efficiency of the wafers with 170 mg deposited Al on the back surface was 17.05 %.
Non-optimised firing condition reduces the power by up to about 15 % from its possible potential due to the
increased series resistance. Firing time and paste chemistry influenced the contact conditions greatly. These factors
also affected the output power loss, the BSF depth and uniformity.
The Impact of POS on Employees’ Work Outcomes in Sri Lanka and the United Arab Emirates
Creators: name: Ashmel, Mohamed
Publisher: name: Cardiff Metropolitan University
Year: 2022
Subjects: Organisational planning and management

description: This study investigates how perceived organizational support (POS) impacts the employees’ work outcomes in information technology offshoring (ITO) contexts in Sri Lanka and the United Arab Emirates, both collectively and independently. Also, this study endeavours to identify the influence of POS and the scope for its practical application in enhancing work outcomes from the perspective of outsourcees, their employers, and the countries concerned, and to the extent to which the findings can be generalised. The research emphasises theory and interpretation of results, however, the analysis validates, to a great extent, the overarching research question of whether, and how POS impacts on work outcomes in ITO. The research study adopts a confirmatory factor analysis and structural equation modelling approach. It was based on a sample of 260 responses to 410 online questionnaires (response rate 63%) delivered to employees from 6 companies each in the United Arab Emirates (141 responses) and Sri Lanka (119 responses). Various media were used including Zoho survey and LinkedIn. Targeting was aided by contacts built by the researcher’s work experience of ITO both in the United Arab Emirates and Sri Lanka. Where necessary the researcher followed up responses with respondents individually. The thesis demonstrates how the POS-ITO model was generated from an extensive literature review, and adapted to relatively neglected ITO context in emerging nations. In UAE and Sri Lanka, outsourcing contributes significantly to employees’ growth and well-being. The major findings of the research have revealed that, despite ITO organizations adopting organizational support practices for knowledge workers in Sri Lanka and UAE, deep understanding of the impact of POS was missing. This research attempts to extend the understanding of POS and provide a practical and usable ITO model to guide the adoption of POS. The research has revealed that the impact of POS is contingent on contextual demographic and socio-cultural factors. It is hoped that the thesis will bring greater understanding of POS, and contribute to the investment attractiveness of both the countries involved. Also hopefully, the thesis offers research implications, and recommendations, that will aid future researchers.
Silicon Carbon-Nitride (SiCxNy:H) by High Target Utilisation System (HiTUS) for Crystalline Silicon Solar Cell Anti-Reflective Coating and Passivation
Creators: name: Kaminski, P.M.
name: Bass, K.
name: Maniscalco, B.
name: Walls, J.M.
name: Claudio, G.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1766-1769
description: SiCxNy:H films were deposited as anti-reflective (ARC)– passivation layers on crystalline silicon
photovoltaics. The thin films were deposited using a remote plasma sputtering system HiTUS (High Target
Utilisation Sputtering). The HiTUS allows the deposition of SiCxNy:H avoiding the use of pyrophoric silane
precursor. Minority carrier lifetime was monitored, the effective minority carrier lifetime increased up to 40.7 μs,
which corresponds to an implied Voc of 640mV. Film roughness and thickness of the films were measured using
coherence correlation interferometry (CCI) using a Taylor Hobson “Sunstar”. Deposited films were found to have
rms roughness values below 2nm and the film roughness was found to be proportional to passivation quality but
inversely proportional to deposition rates. Films were also characterised using Horiba UVISEL spectroscopic
ellipsometer, which provided refractive index dispersion. The deposited films exhibited refractive indexes in the
range of 2-2.5. Measured deposition rates were in range 1-25nm/min.
Improvement of Metallization Process in a Commercial Cz-Si Solar Cell
Creators: name: Vázquez, J.C.
name: Laudisio, G.
name: Anderson, R.
name: Clark, D.A.
name: Caballero, L.J.
name: Vazquez, M.A.
name: Alonso, J.
name: Ramos-Barrado, J.R.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1787-1790
description: One of the main challenges in the production of industrial silicon solar cells is to increase the
efficiency and reduce the cost per watt. To this aim cells and pastes manufacturers need to work in synergy to
improve the substrate and the metallization. Limits to the contacting ability of FS pastes on shallow emitters have
prevented so far cell manufacturers from moving to low P concentration. The latest DuPont developments in
metallization products have allowed Isofoton to move to very shallow emitters achieving the full potential for this
kind of substrates. Efficiency up to 18.7 % has been achieved thanks to a combination of high Voc from the substrate
and high FF from the very low series resistance of the new PV17x series of DuPont FS Ag pastes.
Probing Higgs Width and Top Quark Yukawa Coupling from $t\bar{t}H$ and $t\bar{t}t\bar{t}$ Productions
Creators: name: Cao, Qing-Hong
name: Chen, Shao-Long
name: Liu, Yandong
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We demonstrate that four top-quark production is a powerful tool to constrain the top Yukawa coupling. The constraint is robust in the sense that it does not rely on the Higgs boson decay. Taking into account the projection of the $t\bar{t}H$ production by the ATLAS collaobration, we obtain a bound on Higgs boson width, $Γ_H\leq 3.1~Γ_H^{\rm SM}$, at the 14 TeV LHC with an integrated luminosity of $300~{\rm fb}^{-1}$. Increasing the luminosity to $500~{\rm fb}^{-1}$ yields $Γ_H\leq 2.1~Γ_H^{\rm SM}$.
Orbital clustering of distant Kuiper Belt Objects by hypothetical Planet 9. Secular or resonant ?
Creators: name: Beust, Hervé
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Statistical analysis of the orbits of distant Kuiper Belt Objects (KBOs) have led to suggest that an additional planet should reside in the Solar System. According to recent models, the secular action of this body should cause orbital alignment of the KBOs. It was recently claimed that the KBOs concerned by this dynamics are presumably trapped in mean motion resonances with the suspected planet. I reinvestigate here the secular model underlying this idea. The original analysis was done expanding and truncating the secular Hamiltonian. I show that this is inappropriate here, as the series expansion is not convergent. I present a study based on numerical computation of the Hamiltonian with no expansion. I show in phase-space diagrams the existence of apsidally anti-aligned, high eccentricity libration islands that were not present in the original modelling, but that match numerical simulations. These island were claimed to correspond to bodies trapped in mean-motion resonances with the hypothetical planet, and match the characteristics of the distant KBOs observed. My main result is that regular secular dynamics can account for the anti-aligned particles itself as well as mean-motion resonances. I also perform a semi-analytical study of resonant motion and show that some resonance are actually capable of producing the same libration islands. I discuss then the relative importance of both mechanisms.
description: Accepted in Astronomy & Astrophysics letters
Early Degradation of PV Modules and Guaranty Conditions
Creators: name: Muñoz-García, M.A.
name: Alonso-García, M.C.
name: Chenlo, F.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
PV Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3565-3568
description: CIEMAT PVLabDER has largely increased its demand on testing and characterizing PV plants, according to
the fast growth of PV installed capacity in Spain. One of the topics in which manufacturers, promoters, and owners of the
plants are more interested in, is the possible degradation of PV modules and its relationship to guarantee contracts, as it is
related to subsidies. This paper presents some findings in campaigns of PV plants evaluation carried out during last years.
This evaluation usually consists of visual inspection, I-V curve measurement in the fields (the whole plant or selected areas),
thermal evaluation by IR imaging, and, in some cases, measurement of the I-V characteristic and thermal behaviour of
selected modules in the plant, chosen by the laboratory. It must be noticed that new defects that grow when the module is
into operation may appear in modules initially free of them (named as hidden manufacturing defects). Usually some of these
hidden defects that only appear in normal operation are not detected in reliability tests (EN61215 or EN 61646) [4][5] due to
the different operational conditions of the module in the standard tests and in the field (serial-parallel connection of many PV
modules, power inverter influence, over voltage on wires, etc.)
Electrical Discrepancy between Amorphous Thin Film and Polycrystalline Solar Module
Creators: name: Hsieh, H.-H.
name: Cheng, J.-S.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
PV Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3571-3572
description: Electrical performance of hydrogenated amorphous silicon (a-Si:H) and polycrystalline photovoltaic (c-Si) modules at temperature ranging from 298K to 338K were investigated and compared with various parameters.
In order to realize the I-V performance affected by cell temperature, shunt resistance (Rsh), and series resistance (Rs), fill factor (FF) value was reckoned to evaluate the module performance. In general, the maximum power (Pmax), open circuit voltage (Voc), and short circuit current (Isc) for a-Si:H and c-Si modules showed similar tendencies when heating up the modules. However, a distinct Rs difference of c-Si and a-Si:H module were detected when heating up
the modules. It is very likely that the decreasing FF of c-Si module was mainly dominated by the increasing Rs; reversely, the increasing FF of a-Si:H module was controlled by the decreasing Rs.
Next Generation of Laser Scribing Technology for Grid-Parity and Beyond
Creators: name: Witte, T.
name: Gahler, A.
name: Booth, H.J.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Thin Film Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 3213-3216
description: Laser systems have become the tool of choice for thin-film module manufacturing due to their
selective machining, well defined interaction region, high precision and cost effectiveness. The accurate scribing in
the thin films allow narrow scribes to be placed close together on the modules, hence minimizing the ‘dead zone’
between the active cells. This optimized active area coupled with the single step laser process required to produce
each patterning step and the high yield from the systems contribute significantly to the goal of low cost of ownership
in silicon thin film photovoltaics. In this mission to reduce costs and improve module performance the drivers for
laser scribing as part of the end-to-end solution for grid parity module production are explained. The next generation
of Oerlikon Solar’s industrial platforms will be introduced and performance data discussed.
Preparation of Transparent Conducting ZnO:Al Films as Front Contact of Flexible Substrate Solar Cells
Creators: name: Wang, Y.
name: Pei, Z.
name: Xu, J.
name: Cai, H.
name: Zhang, D.
name: He, Q.
name: Zhang, X.
name: Zhao, X.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Thin Film Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 3217-3219
description: In this study, ZnO:Al films with high transmittance and conductivity were prepared on glass and
polyimide substrate with twin-target DC magnetron sputtering. The films’ structure, composition and photoelectronic
properties were analyzed by XRD, XPS, Hall effect measurement system and spectrophotometer,
respectively. Through sputtering parameters optimizing work, films with Hall resistivity of 5.8×10-4 Ω·cm, Hall
mobility of 31.6 cm2/ (V·s) and visible region light transmittance over 85% were obtained. While the ZnO:Al films
were used as the front contact of a-Si:H solar cells, 750nm was an appropriate thickness to achieve anti-reflect effect,
according the calculating results. With the optimum ZnO:Al electrode, the short-circuit current density of a-Si:H
solar cells on polyimide substrate was increased from 6.25 to 8.29mA/cm2, and the conversion efficiency was
extended to a great extent (1.3%).
Time-series spectroscopy of the pulsating eclipsing binary XX Cephei
Creators: name: Koo, Jae-Rim
name: Lee, Jae Woo
name: Hong, Kyeongsoo
name: Kim, Seung-Lee
name: Lee, Chung-Uk
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Oscillating Algol-type eclipsing binaries (oEA) are very interesting objects that have three observational features of eclipse, pulsation, and mass transfer. Direct measurement of their masses and radii from the double-lined radial velocity data and photometric light curves would be the most essential for understanding their evolutionary process and for performing the asteroseismological study. We present the physical properties of the oEA star XX Cep from high-resolution time-series spectroscopic data. The effective temperature of the primary star was determined to be 7,946 $\pm$ 240 K by comparing the observed spectra and the Kurucz models. We detected the absorption lines of the secondary star, which had never been detected in previous studies, and obtained the radial velocities for both components. With the published $BVRI$ light curves, we determined the absolute parameters for the binary via Wilson-Devinney modeling. The masses and radii are $M_{1} = 2.49 \pm 0.06$ $M_\odot$, $M_{2} = 0.38 \pm 0.01$ $M_\odot$, $R_{1} = 2.27 \pm 0.02$ $R_\odot$, and $R_{2} = 2.43 \pm 0.02$ $R_\odot$, respectively. The primary star is about $45 \%$ more massive and $60 \%$ larger than the zero-age main sequence (ZAMS) stars with the same effective temperature. It is probably because XX Cep has experienced a very different evolutionary process due to mass transfer, contrasting with the normal main sequence stars. The primary star is located inside the theoretical instability strip of $δ$ Sct-type stars on HR diagram. We demonstrated that XX Cep is an oEA star, consisting of a $δ$ Sct-type pulsating primary component and an evolved secondary companion.
description: 16 pages preprint, 6 figures, 4 tables, AJ accepted
Optical SETI Observations of the Anomalous Star KIC 8462852
Creators: name: Schuetz, Marlin
name: Vakoch, Douglas A.
name: Shostak, Seth
name: Richards, Jon
Publisher: name: arXiv
Year: 2015
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: To explore the hypothesis that KIC 8462852's aperiodic dimming is caused by artificial megastructures in orbit (Wright et al. 2015), rather than a natural cause such as cometary fragments in a highly elliptical orbit (Marengo et al. 2015), we searched for electromagnetic signals from KIC 8462852 indicative of extraterrestrial intelligence. The primary observations were in the visible optical regime using the Boquete Optical SETI Observatory in Panama. In addition, as a preparatory exercise for the possible future detection of a candidate signal (Heidmann 1991), three of six observing runs simultaneously searched radio frequencies at the Allen Telescope Array in California. No periodic optical signals greater than 67 photons/m2 within a time frame of 25 ns were seen. This limit corresponds to isotropic optical pulses of 8E22 joules. If, however, any inhabitants of KIC 8462852 were targeting our solar system (Shostak & Villard 2004), the required energy would be reduced greatly. The limits on narrowband radio signals were 180 - 300 Jy Hz at 1 and 8 GHz, respectively, corresponding to a transmitter with an effective isotropic radiated power of 4E15 W (and 7E15 W) at the distance of KIC 8462852. While these powers requirements are high, even modest targeting could - just as for optical signals - lower these numbers substantially.
description: Submitted to ApJL
Reliable spin-transfer torque driven precessional magnetization reversal with an adiabatically decaying pulse
Creators: name: Pinna, Daniele
name: Ryan, Colm
name: Ohki, Thomas
name: Kent, Andrew D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that a slowly decaying current pulse can lead to nearly deterministic precessional switching in the presence of noise. We consider a biaxial macrospin, with an easy axis in the plane and a hard axis out-of-the plane, typical of thin film nanomagnets patterned into asymmetric shapes. Out-of-plane precessional magnetization orbits are excited with a current pulse with a component of spin polarization normal to the film plane. By numerically integrating the stochastic Landau-Lifshitz-Gilbert-Slonczewski equation we show that thermal noise leads to strong dephasing of the magnetization orbits. However, an adiabatically decreasing pulse amplitude overwhelmingly leads to magnetization reversal, with a final state that {\em only} depends on the pulse polarity, not on the pulse amplitude. We develop an analytic model to explain this phenomena and to determine the pulse decay time necessary for adiabatic magnetization relaxation and thus precessional magnetization switching.
description: 19 Pages, 7 Figures