cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Module Stabilization Time in Utility-Scale PV Plants: Initial Degradation and Nameplate Tolerance
Creators: name: Carretero, A.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2204-2209
description: The rate of reduction in a PV module’s power performance is not constant over time. Whilst trying to
obtain a reliable annual degradation trend line, a number of outlying degradation figures were observed during a
module’s early operational life, related to its required time for stabilization. For PV-Plants equipped with precise
string-monitoring systems, it is possible to detect this transient module behaviour and use it advantageously. This
paper presents an innovative method to identify the behaviour by simulating module flash testing under actual
operation. The method is applicable for large-scale PV plants with weather conditions close to STC. After plotting the
simulation results over a plant’s operational lifetime, and applying linear regression models, various other interesting
outcomes concerning the outdoor characterization and performance of the module were obtained, for example
verification of the nameplate power tolerance and prediction of the module’s life. Finally, these outcomes have been
used to cross-check the commonly-accepted manufacturer´s 25-year power warranty.
Verification of Energy Yields of Large Solar Power Plants by Simulation
Creators: name: Dietrich, A.
name: Herrmann, R.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2220-2224
description: For more than 10 years large solar power plants have generated sustainable, ecological energy.
The optimal yield of “industrial” solar plants is today much more the concern and economic focus of both owners and
operators, respectively. To compare current installations, the operational data of several solar power plants in
Germany and the Czech Republic were technically analysed and investigated by using industry professional
simulation software.
A further objective of the report was to examine, whether simulation with measured weather data could be a reliable
means to identify problems in the operation of solar power plants. The findings are based solely on data measurement
of the plant yield and the actual irradiation and temperature conditions prevalent to both verify and give a meaningful
comparison of the simulation results. Some interesting results were achieved.
DiSUN Deutsche Solarservice GmbH is an independent service provider and manages the operation of approximately
205 MWp solar power plants in Germany, Czech Republic and Italy.
Potential Induced Degradation (PID) Diagnosis, Treatment and Module Recovery in a Grid Connected Photovoltaic (PV) Power Station in Greece
Creators: name: Chliaoutakis, A.
name: Protogeropoulos, C.
name: Karelas, G.
name: Doukas, E.
name: Talfanidou, M.
name: Papaioannou, E.
name: Foukarakis, E.
name: Zouboulis, I.
name: Tsimpris, P.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2167-2172
description: Recent technical reports and studies indicate that the PID effect in crystalline PV modules is affecting the
operation of PV Power Stations (PPS) worldwide. The combination of certain environmental, system and PV module
parameters could potentially reduce PV module’s efficiency and output. Various PID identification methods exist, while
cure techniques have already been published. The current study focuses on the appearance of PID in a grid connected
PPS installed on an island in Greece. The examination of the PPS will be on inverter basis and according to the
performance indices as proposed by the IEC 61724 international standard. The present study highlights the need for
proper O&M actions and presents all the stages from the diagnosis of the PID affected PV modules till the final
conclusions after the treatment is applied and deemed complete.
Two-Year Performance Comparison Assessment between Central- and Multistring-Based Inverters Installed in Large-Scale Photovoltaic Power Stations in Greece
Creators: name: Chliaoutakis, A.
name: Protogeropoulos, C.
name: Weiss, I.
name: Kaldellis, J.
name: Kavadias, K.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2173-2178
description: In the last year’s 29th EU PVSEC, the authors [1] presented a one-year real-life performance behaviour
assessment of the two main inverter technologies used in large-scale grid connected PV Power Stations (PPS). This paper
is intended to present a full two-year performance comparison between central and multistring inverters. In this context,
the main purpose of this research study is to provide an updated comprehensive assessment of performance advantages
and disadvantages of the inverter technologies under examination. This shall be effect by applying the second year’s data
in the comparison assessment and by re-evaluating the first year’s results. The comparison assessment will use a full two
year real-life data derived from the operation of two 500kWp grid-connected PPS, located close to the city of Lamia in
Central Greece. Both PPS are designed, installed and maintained by the same EPC contractor. The same type of
polycrystalline modules is used, adopting also the same panel tilt and shading angle. At the same time however, PPS "A"
is based on the operation of one central inverter, while PPS "B" uses 25 multistring inverters. The inverters used in both
parks are supplied from the same manufacturer. In this way, the technical design features and the adjacent location of the
two PPS enable in depth analysis via the direct comparison of the inverters’ performance indices as proposed by the IEC
61724 international standard. Through analysis of the monitored data, the results indicate a small advantage for the
central configuration. Further to that, the list of each system’s advantages and disadvantages was updated. Monitoring
will be continued and a more detailed insight on the overall performance of the two PPS will be reported in the future.
Measurement of the Partial Z Decay Width into b Quarks with the L3 Detector at LEP
Creators: name: Kamrad, Dirk
Publisher: name: Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I
Year: 1999
Subjects: subject: b Quark
subject: Z Boson
subject: Kopplungen
subject: Zerfallsbreite
subject: Couplings
subject: Decay Width
subject: 530 Physik
subject: 29 Physik, Astronomie
subject: UO 5200

description: im PostScript-Format
Site Assessment – Analysis of Energy Meteorological Characteristics for a Better Understanding of PV System Performance
Creators: name: Zehner, M.
name: Obelz, S.
name: Kaiser, F.
name: Haselhuhn, R.
name: Giesler, B.
name: Mayer, O.
name: Gottschalg, R.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2143-2146
description: The accurate analysis of high resolution measurement data provides and thus enables a lot more
knowledge about site-specific irradiance characteristics (Irradiance Variability, – IV and Irradiance Enhancements – IE).
This know-how is fundamental for certain PV applications. Virtual power plants (VPPs) with noticeable PV impact
(performance input) can therefore modulate the complementary plants within their accounting grid. Other examples are
PV stand-alone-hybrid systems (MW-systems and off-grid solar systems for villages for instance, service security). The
operation of the hybrid Diesel generators could be optimized if there is reliability about the location-specific irradiation
properties. This publication introduces a sequence of methods which were developed to understand the necessary energy
meteorological site conditions. The software environment Matlab was used to apply the methods on certain BSRB
reference locations. This is done in three sub-projects which provide categories of diurnal GHI variations, assess the
energy rating over one year and also qualify each daily performance over one year. The methods and figures were tested
upon several data sets. Presented in this publication are the site-analyses of four representative European BSRN locations
from different climatic zones.
Study, Verification and Selection of Cooling System Model for PV Modules with Verification Prototype
Creators: name: Da Silva, V.O.
name: Veiga Gimenes, A.L.V.
name: Ribeiro Galvão, L.C.
name: Morales Udaeta, M.E.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2161-2166
description: The aim of this work is to analyze the impact of the use of two PV modules cooling systems in the
production of electrical energy and determine the model with the best performance for installation at PV power plant
(PVPP), 100 kWP. The methodology is based on empirical M&V and analysis of the operating temperatures in PV
modules with and without cooling and study of the coolers water supply system’s behavior in a micro-grid on PVPP,
1.45 kWP installed capacity. Through the analyzes of the data it was found that, when they are generating power, PV
module with cooling system always operate at lower temperatures without cooling the PV modules. During the tests,
in which the temperature of the PV painel operated without cooling above 60.00°C to 68.06°C maximum, maximum
temperatures recorded in the PV painel sensors with cooler Model A were 43.55°C and 44.75°C and the PV module
with Model B were 46.76°C and 48.33°C. In addition, the PV module with the Model A was the only one to be
always below the operating temperatures NOCT. Therefore, the model A was selected to be mass produced and
installed in the cooled PVPP prototype.
UniSAFE: The National Research Centre For Science – institutional policy to address gender-based violence
Creators: name: Huck, Averil
name: Andreska, Zuzana
name: Linkova, Marcela
Publisher: name: Zenodo
Year: 2022
Subjects: Gender based-violence
policy framework
gender+
institutional policy

description: UniSAFE has mapped the policies and measures to address and combat GBV in 48 universities and research organisations in 15 European countries. For each institution, the team created Vignettes which present national context, institutional policy, training, role in knowledge production, content of the policy, institutional procedure and implementation of the policy.
A thermodynamic paradigm for solution demixing inspired by nuclear transport in living cells
Creators: name: Wang, Ching-Hao
name: Mehta, Pankaj
name: Elbaum, Michael
Publisher: name: arXiv
Year: 2016
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Living cells display a remarkable capacity to compartmentalize their functional biochemistry. A particularly fascinating example is the cell nucleus. Exchange of macromolecules between the nucleus and the surrounding cytoplasm does not involve traversing a lipid bilayer membrane. Instead, large protein channels known as nuclear pores cross the nuclear envelope and regulate the passage of other proteins and RNA molecules. Beyond simply gating diffusion, the system of nuclear pores and associated transport receptors is able to generate substantial concentration gradients, at the energetic expense of guanosine triphosphate (GTP) hydrolysis. In contrast to conventional approaches to demixing such as reverse osmosis or dialysis, the biological system operates continuously, without application of cyclic changes in pressure or solvent exchange. Abstracting the biological paradigm, we examine this transport system as a thermodynamic machine of solution demixing. Building on the construct of free energy transduction and biochemical kinetics, we find conditions for stable operation and optimization of the concentration gradients as a function of dissipation in the form of entropy production.
description: 6+9 pages, 4+5 figures, to appear in Phys. Rev. Lett
Superconducting gap structure of FeSe
Creators: name: Jiao, Lin
name: Huang, Chien-Lung
name: Rößler, Sahana
name: Koz, Cevriye
name: Rößler, Ulrich K.
name: Schwarz, Ulrich
name: Wirth, Steffen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The microscopic mechanism governing the zero-resistance flow of current in some iron-based, high-temperature superconducting materials is not well understood up to now. A central issue concerning the investigation of these materials is their superconducting gap symmetry and structure. Here we present a combined study of low-temperature specific heat and scanning tunnelling microscopy measurements on single crystalline FeSe. The results reveal the existence of at least two superconducting gaps which can be represented by a phenomenological two-band model. The analysis of the specific heat suggests significant anisotropy in the gap magnitude with deep gap minima. The tunneling spectra display an overall "U"-shaped gap close to the Fermi level away as well as on top of twin boundaries. These results are compatible with the anisotropic nodeless models describing superconductivity in FeSe.
description: 8 pages, 5 figures
A Study of the Impact of Climate on the Optimal Geometry of a LCPV System
Creators: name: Pavlov, M.
name: Migan-Dubois, A.
name: Bourdin, V.
name: Pons, M.
name: Badosa, J.
name: Haeffelin, M.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2114-2118
description: The inter-row spacing of classical photovoltaic (PV) plants is generally chosen to avoid shading during
periods of significant solar radiation. The installation results in widely-spaced rows, and the inter-row space is
illuminated during periods of high solar resource. The addition of inter-row reflectors augments the direct and diffuse
flux reaching the PV cells while resulting in a lower inter-row spacing, which is advantageous for both large-scale
and rooftop installations. The project aims to explore the benefits of equipping the inter-row space with highly
reflective surfaces, and develop clear rules for optimal settings of the PV+Reflector system in a specified location and
climate. An integrated model of the system was developed and validated with a demonstrator installed on the SIRTA
meteorology platform (Palaiseau, France, 48.71°N, 2.21°E). The model was applied on three cities with similar
latitudes but different climates: St. Johns, Palaiseau and Bratislava. The locations were compared based on achievable
gains and optimal settings.
Obtaining Reliable Results Concerning the Expected Effect of Regional Air Pollution on Tilt Fixed Latitude PVs’ Performance at High Polluted Region in the World
Creators: name: Rahoma, U.A.
name: Hassan, A.A.
name: Abulwfa, A.A.
name: Khalef, G.M.G.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2137-2142
description: Solar energy can be collected to produce electricity by a variety of methods. Among these
methods, photovoltaic PV systems have shown great success due to many reasons. The annual total solar is
yield at the optimal tilt surface. Implementations of PV systems have shown that their reliability and
efficiency depend on many factors, the dominant being geographical (latitude, longitude, and solar
intensity), environmental (temperature, wind, humidity, pollution, dust, rain, etc.) and the type of PV used.
Dust is the lesser acknowledged factor that significantly influences the performance of the PV installations.
The important of this study came due to the transfer of large scale PV technology to the desert area in
Egypt. This area is hot and dusty most of the time and dust represent the main barrier to PV utilization. The
energy outputs and efficiencies were simulated using a computer package to predict energy use and forecast
energy use improvements in an operating data center.
This paper provides an appraisal on the current status of research in studying the radiation damage by dust
on PV system performance and identifies challenges to further pertinent research. A framework to
understand the various factors that govern the settling assimilation of dust and likely mitigation measures
have been discussed in this paper. Cement dust is considered the main source of pollution. This dust is
often present in the atmosphere in the Helwan area and is shown to reduce both the short circuit current and
the open circuit voltage when deposited onto the surface of photovoltaic cells. The rate of decrease in these
parameters depends mainly on the rate of dust deposition. Degradation in efficiency for a-Si is 66% after
six months without panel cleaning. The decrease in efficiency for Poly-Si is 9% due to the suspended
particles with panel cleaning.
Outdoors Measurements of PV Module Efficiency and Temperature Coefficients
Creators: name: Martinez-Moreno, F.
name: Carrillo, J.M.
name: Lorenzo, E.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2051-2056
description: Performance of a PV installation depends critically on the modules behaviour. That is the reason why a
good estimation of energy production of a PV installation relies not only on the goodness of the module power
characterization at standard test conditions, but also on the goodness of the characterisation of the module behaviour
related to the variation of irradiance and temperature. So, it is closer to the reality running a simulation exercise of
energy production with the actual values measured outdoors than with the values obtained from datasheets. This
paper presents a device specifically implemented to measure outdoors the power of modules at standard test
conditions, as well as their efficiency variation with irradiance and their temperature coefficients. Results of
measurements with this device are also reported.
Mesoscopic Superposition States Generated by Synthetic Spin-orbit Interaction in Fock-state Lattices
Creators: name: Wang, Da-Wei
name: Cai, Han
name: Liu, Ren-Bao
name: Scully, Marlan O.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Mesoscopic superposition states of photons can be prepared in three cavities interacting with the same two-level atom. By periodically modulating the three cavity frequencies around the transition frequency of the atom with $2π/3$ phase difference, the time reversal symmetry is broken and an optical circulator is generated with chiralities depending on the quantum state of the atom. A superposition of the atomic states can guide photons from one cavity to a mesoscopic superposition of the other two cavities. The physics can be understood in a finite spin-orbit-coupled Fock-state lattice where the atom and the cavities carry the spin and the orbit degrees of freedom, respectively. This scheme can be realized in circuit QED architectures and provides a new platform for exploring quantum information and topological physics in novel lattices.
description: 6 pages, 3 figures
Variability and Trend in the Annual Solar Irradiation Determined from Meteosat Satellite Data
Creators: name: Huld, T.
name: Trentmann, J.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Operation of PV Systems and Plants

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2073-2076
description: We present a study of the variability of the annual solar irradiation and the long-term trend in solar radiation, based on the retrieval of solar radiation data from satellite images. For Europe and Africa the data from the METEOSAT satellites comprise the period 1983-2013 while for Asia the eastern METEOSAT satellites have been used for the period 1999-2014. Results show that over most desert areas the year-to-year variability is low, with a relative standard deviation of 1% or less. Temperate climates show higher variability at 3-5%, while the highest variability is found in mountain areas in Europe and Asia where the standard deviation may reach 7-8%. An analysis of the long-term trend in solar radiation shows that in most areas the calculated trend is not statistically significant at the p<0.05 level. Areas showing a significant trend are most of Eastern Europe (+2 to 3% per decade), Tropical West Africa (-1 to -2 %/decade) and parts of Central Asia (up to +5% per decade). One weakness of the present study is that long-term averages of the aerosol optical depth have been used whereby variations and trends in aerosols have not been taken into account.
Exact Simulation of Noncircular or Improper Complex-Valued Stationary Gaussian Processes using Circulant Embedding
Creators: name: Sykulski, Adam M.
name: Percival, Donald B.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Methodology (stat.ME)
subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: This paper provides an algorithm for simulating improper (or noncircular) complex-valued stationary Gaussian processes. The technique utilizes recently developed methods for multivariate Gaussian processes from the circulant embedding literature. The method can be performed in $\mathcal{O}(n\log_2 n)$ operations, where $n$ is the length of the desired sequence. The method is exact, except when eigenvalues of prescribed circulant matrices are negative. We evaluate the performance of the algorithm empirically, and provide a practical example where the method is guaranteed to be exact for all $n$, with an improper fractional Gaussian noise process.
description: Link to published version: http://ieeexplore.ieee.org/document/7738840/
Possibilities and Challenges of Thermal Transient Testing as a Characterization Method for Photovoltaic Devices
Creators: name: Plesz, B.
name: Szabó, P.G.
name: Dudola, D.
name: Hantos, G.
name: Ress, S.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2031-2034
description: The thermal behaviour of mass production terrestrial solar modules is a somehow neglected but very
important issue of photovoltaics. Despite its significant influence on the power generation, the thermal properties of
solar modules are mostly not taken into account in daily applications. In recent literature thermal transient testing was
suggested as a possible solution to proper thermal characterization of photovoltaic devices. In this paper we give a short
overview on the known issues of the thermal transient testing of photovoltaic devices and address the issue of the
variation of the structure function at different heating currents as well as the influence of the initial degradation of
amorphous solar cells on the measurement results. It is shown that for small current densities the increasing forward
driving current (i.e. the heating current) can have a strong influence on the size of the active area that on the other hand
determines the volume of the heat path. Due to this an increasing heating current results in the decrease of the junction
to ambient thermal resistance, with the thermal resistance converging to a minimum value at high heating currents. The
phenomenon was also investigated by Kelvin probe potential mapping. In addition it was investigated how the initial
degradation of amorphous silicon solar cells effect the results of the thermal transient measurement.
Power, structures, and norms
Creators: name: Steinel, Anna
Publisher: name: Humboldt-Universität zu Berlin, Philosophische Fakultät III
Year: 2007
Subjects: subject: NATO
subject: Russland
subject: Permanent Joint Council
subject: NATO-Russia Council
subject: Zentralasien
subject: Balkan
subject: 11. September
subject: Russia
subject: Central Asia
subject: the Balkans
subject: 9/11
subject: 320 Politik
subject: 16 Politik
subject: MK 6700
subject: ML 7250

description: Die vorliegende Arbeit beschäftigt sich mit der Untersuchung der institutionalisierten Beziehungen zwischen der NATO und Russland seit 1997 und konzentriert sich dabei besonders auf die Ergebnisse des „Permanent Council“ (PJC, 1997) und des „NATO-Russia Council“ (NRC, 2002). Das Vermächtnis von Strukturen, die während des kalten Krieges entstanden, beeinflusst weiterhin die Interaktionen zwischen der NATO und Russland. Dies wurde insbesondere während der Kosovo-Krise und nach dem 11. September 2001, welcher die „post-post-Cold War era“ einläutete, sichtbar. Das zentrale Kapitel der Dissertation beinhaltet eine empirische Analyse der Policy-Felder, denen sich der PJC und der NRC widmen. Hier wird vor allem auf die Zusammenarbeit von der NATO und Russland auf dem Balkan und auf den Kampf gegen den Terrorismus eingegangen. Die Fallstudie untersucht NATO-Russland Interaktionen in Zentralasien; besonders im Hinblick auf geopolitische Trends, die für beide Akteure und ihre zukünftigen Beziehungen wichtige Auswirkungen haben werden. Diese Arbeit untersucht die Qualität der Beziehungen zwischen der NATO und Russland anhand von Ereignissen, welche diese Beziehungen geprägt haben und erklärt, warum manche Verhaltensmuster sich kontinuierlich wiederholen.
description: This dissertation examines the institutionalized relationship between NATO and Russia since 1997; focussing on the outcomes of the 1997 Permanent Joint Council (PJC) and the 2002 NATO-Russia Council (NRC). The legacy of Cold War structures has continued to influence the way NATO and Russia interact; most notably during the Kosovo crisis and in the aftermath of the attacks of September 11 that rang in the “post-post-Cold War era”. The bulk of the research consists of an empirical analysis of policy fields covered by the PJC and the NRC. Particular attention is given to NATO-Russia interaction in the Balkans, as well as to the fight against terrorism. The case study assesses NATO-Russia interaction in Central Asia, taking into consideration geopolitical trends that will shape both actors’ actions in the future. Tracing events that have shaped NATO-Russia relations, this dissertation analyzes the quality of NATO-Russia relations and explains why certain patterns keep reoccurring.
Accurate Yearly Yield Calculation Using PV Module Fingerprint Method – Applied for MWT, H-Pattern and Thin Film Modules
Creators: name: Dekker, N.J.J.
name: Kroon, J.M.
name: Jansen, M.J.
name: Eerenstein, W.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2047-2050
description: The yearly yield of a module in kWh/kWp depends on the module, the mounting of the module and
the location. Accurate models for the calculation of the yearly yield can be very detailed and require many
parameters. The parameters of these models are often difficult to determine. Simple models are often not very
accurate. In this paper, a method will be described which is simple and accurate for x-Si (MWT back contact and
H-pattern) and triple junction a:Si thin film modules.
The method consists of 2 stages. First a so-called fingerprint is made of the module at given location. The input
for the fingerprint is the irradiance, ambient and module temperature and power output of the module during a
limited timeframe. No IV curve, open cell voltage or short circuit current is required. Secondly the power output
is calculated with ambient temperature and irradiance data as input, from which the yearly yield in kWh/kWp can
be calculated.
The accuracy of the model was determined from the comparison of the calculated and measured module
temperature and power output. For the x-Si modules, the deviation of the yearly yield was <0.1%, while for the
a:Si the deviation was 2%. The higher deviation of the a:Si was due to the lower stability of the thin film module
during the year of operation.
Geospatial Mapping of Spectral Mismatch of Multi-Junction Photovoltaic Modules Using Satellite-Retreived Spectral Irradiance Data
Creators: name: Vourlioti, P.
name: Huld, T.
name: Gracia Amillo, A.M.
name: Norton, M.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2017-2021
description: We present a method for estimating the effect of variations in the solar radiation spectrum on the
performance of multijunction PV devices. This method combines measured spectral response data for each subcell in
a multijunction device with hourly spectrally resolved solar radiation data retrieved from satellite images. Calculating
the short-circuit current for every hour in a year it is possible to approximate how much energy a PV device will
produce compared to what it would have produced under the standard solar spectrum. The investigation was carried
out for two PV technologies: a tandem amorphous silicon module and a multijunction III-V type cell for
concentrators. The calculations were done for an area covering Europe and Africa. The results show that the tandem
a-Si will produce more energy in nearly all areas but the amount of gain varies strongly, from about +2% in desert
areas and about +4-5% in most of Europe to +10-12% in Tropical Africa. In contrast the concentrator cell is less
affected by changes to the direct normal irradiance spectrum. The effect is mostly slightly negative, from around -1%
to -2% in most desert areas and in Europe to -4% over the Arabian Pensinsula. It was found that for the a-Si tandem
device the top cell is nearly always current-limiting while for the multijunction cell the junction that is limiting will
depend on geographical location.
Modeling the Excess Heat Inside Photovoltaic Module Before and After Photocurrent Conversion Process
Creators: name: Magare, D.
name: Sastry, O.S.
name: Gupta, R.
name: Bora, B.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2027-2030
description: The efficiency of PV module can be increased by understanding the source which affects the electrical
performance. The conventional crystalline PV modules produced in India, have electrical conversion efficiency limits
up to 25 %. It infers that the remaining part of incident solar energy is either lost or converted to the heat energy. The
present work has been focused on the differences in dissipation of power, of two different PV module technologies,
i.e. multi-crystalline silicon (mc-Si) and Hetro-junction with Intrinsic Thin film (HIT). An analysis of power
dissipation due to heat was carried out by calculating the loss of energy in the spectral range. These calculations are
applied at two stages: when the energy absorbed in the module which does not contribute in the generation of
photocurrent,
abs P , and when the excess energy of photon do contributed in photocurrent,
excess P . A new model has
been proposed for dissipation of power in the form of heat from excess photon energy (
excess P ) by considering
recombination loss. The
excess P with
recombine R observed to be 99.2 W/m2 for mc-Si. Compared to old
excess P model, the new
model gave an improvement in
excess P where error ranging from 0.6 to 2.2 %. The new model gave 2 % change in
excess P for mc-Si when recombination loss taken into consideration.
Neutron scattering by Dirac multipoles
Creators: name: Lovesey, S. W.
name: Khalyavin, D. D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Ordered magnetic charge created by Dirac multipoles that are magnetic and polar is examined. It has previously been revealed in the pseudo-gap phase of high-Tc materials by use of the Kerr effect and magnetic neutron Bragg diffraction. There are several forms of the polar operator for magnetic neutron scattering built from spin and electric dipole operators of unpaired electrons. Construction of Dirac quadrupoles that emerge from centrosymmetric sites used by Cu ions in the ceramic superconductor Hg1201 is illustrated, together with selection rules for excitations that will feature in neutron inelastic scattering, and RIXS experiments. Most reported expressions and results have universal value, because they are not specific to ceramic superconductors. To illustrate this aspect of our work we simulate neutron diffraction from a magnetically ordered iridate (Sr2IrO4).
Real Time I-V Bench for Outdoor Characterization of Photovoltaic Modules under Hot Environment
Creators: name: Soro, Y.M.
name: Tossa, A.K.
name: Yamegueu, D.
name: Sicot, L.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 1984-1988
description: The Laboratory of Solar Energy and Energy Saving located in a hot climate area and the Laboratory of
Photovoltaic Modules in a temperate climate zone, lead a common research program on the behavior of PV modules and the
energy production according to the climate. For these purposes, the same outdoor characterization facilities have been mounted
in the two laboratories. Then, the same silicon modules of different technologies have been installed on both platforms where
the I-V curves as well as climatic parameters are continuously measured. Furthermore, electrical models are developed to
analyze the data and each technology performance according to the environmental conditions. In the end, we expect that this
facility helps us, on one hand to model the behavior of a given technology in a zone where a characterization tool is not
available, and on other hand to choose the suitable technology for a given climate. For example, our first results show that the
HIT modules give the highest yields in Burkina Faso, a hot environment.
A Simple Method of Evaluating Thermograms of Photovoltaic Modules
Creators: name: Cerná, L.
name: Finsterle, T.
name: Hrzina, P.
name: Benda, V.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2035-2036
description: A common problem to be solved during the operation of photovoltaic (PV) power plants is early
detection of faults in PV systems. For this purpose was developed many diagnostic methods which can be applied
directly at the PV system without the need of its disassembling. A very popular tool is especially the analysis of
temperature distribution on the PV module - thermography, which is also a good tool for checking electrical
connections (fire hazard). The problem is that there is virtually no quantification of obtained thermograms. This work
provides guidance on how to reliably perform such quantification without the need of any other special device using.
Analysis of the Field Performance of a Double Junction Amorphous Silicon Photovoltaic Module and its Correlation to Standardized Testing
Creators: name: Phinikarides, A.
name: Makrides, G.
name: Georghiou, G.E.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 1992-1996
description: In this work, outdoor and indoor measurements from a double junction amorphous Silicon (a-Si)
photovoltaic (PV) module installed at the PV Technology outdoor test site of the University of Cyprus were used to
assess the field performance from November 2012 to June 2015. The measurements consisted of continuous currentvoltage
(I-V) curves from outdoor testing and bi-weekly indoor ratings at standard test conditions (STC) in a solar
simulator. In order to accurately evaluate the field performance under varying meteorological conditions, the
electrical parameters were extracted from field I-V curves and were then filtered for high irradiance and low angles of
incidence, extrapolated to 1000 W/m2 irradiance and corrected for temperature losses. Additionally, the outdoor I-V
curves were used to calculate Loss Factor Model (LFM-B) parameters. A comparison of the indoor ratings at STC to
each of the two field performance indicators has shown that there was very good agreement with a mean absolute
percentage error (MAPE) of 2.9 % and 4.47 % when using the filtered and corrected PMPP and the LFM-B
Performance Factor (PF), respectively. Lastly, the effects of the module’s metastable behavior on the performance
were analyzed from indoor measurements at STC. It has been shown that the module suffered a degradation rate of
2.36 %/year, while the Staebler-Wronski effect and thermal annealing resulted in ±3 % variation of the performance,
observable throughout the year.
Comparison of Volumes of Siegel Sets and Fundamental Domains of $\mathrm{SL}_n(\mathbb{Z})$
Creators: name: Paula, Gisele Teixeira
Publisher: name: arXiv
Year: 2016
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20G20, 20G30, 51N30, 14L35

description: The purpose of this paper is to calculate explicitly the volumes of Siegel sets which are coarse fundamental domains for the action of $\mathrm{SL}_n (\mathbb{Z})$ in $\mathrm{SL}_n (\mathbb{R})$, so that we can compare these volumes with those of the fundamental domains of $\mathrm{SL}_n (\mathbb{Z})$ in $\mathrm{SL}_n (\mathbb{R})$, which are also computed here, for any $n\geq 2$. An important feature of this computation is that it requires keeping track of normalization constants of the Haar measures. We conclude that the ratio between volumes of fundamental domains and volumes of Siegel sets grows super-exponentially fast as $n$ goes to infinity. As a corollary, we obtained that this ratio gives a super-exponencial lower bound, depending only on $ n $, for the number of intersecting Siegel sets. We were also able to give an upper bound for this number, by applying some results on the heights of intersecting elements in $ \mathrm{SL}_n (\mathbb{Z}) $.
description: This is a pre-print of an article to appear in Geometriae Dedicata. The final authenticated version will be available online at: https://doi.org/10.1007/s10711-018-0350-5
Protein-Protein Interactions and Novel Biomarkers of Human Aging
Creators: name: Khatami, Sara
name: Silverman, Rosalind
name: Silverman, Lorelei
Publisher: name: figshare
Year: 2023
Subjects: Other health sciences not elsewhere classified

description: Aging has become a real concern for the modern world as the incidence has been on the rise with the longer lifespan and increasing rate of older population. The condition is associated with several short-term and long-term consequences in the senior citizens as well as younger population. Despite extensive research, there are no clearcut biomarkers identified which could be used for the early detection of aging and could act as the target for curative interventions to increase healthy lifespan. Bioinformatics approach to models of human diseases helps identifying protein-protein interactions (PPI) and biomarkers of Aging to incorporate functional protein networks in predicting associations between groups of proteins involved in Human Aging. The biopsychosocial backgrounds, oxidative stress in addition to changes in gene expression of an individual deeply influence the aging process. Research shows that Aging is not only the result of DNA damage and telomer dysfunction, but also mitochondrial dysfunction plays an important role. If persistent, this may be associated with the development of stress-related disorder in different organs, including brain, heart, vessels and other organs. In this article, we discuss evidence supporting the connection of a network of proteins particularly receptors that were proven to be involved in the pathophysiology of Aging.
Analysis and Comparison of Electrical PV Modeling Techniques Based on Datasheet Values
Creators: name: Callegaro, L.
name: Ciobotaru, M.
name: Agelidis, V.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 2006-2011
description: The ability to reproduce electrical characteristics of a PV module is an essential skill for circuitoriented
simulation of solar power processing equipment. This work presents and compares selected PV parameter
estimation techniques. The five parameters of the single diode equivalent PV circuit, namely series resistance, shunt
resistance, photo-generated current, diode ideality factor and saturation current are estimated according to analytical
methods involving the Lambert-W function and numerical methods using the Newton-Raphson algorithm. For each
method, current vs. voltage and power vs. voltage curves are generated and compared with the graphs reported in the
datasheet. It is observed that curves obtained by extracting the five parameters via analytical solutions are closer to
the characteristics published by the manufacturer than those curves obtained by extracting the parameters via
numerical methods. Based on this evidence and also considering the ease of implementation, analytical parameter
estimation techniques are preferred to their numerical counterparts for PV modelling within circuit based simulation
environments.
Electrical and Morphological Degradation Analysis of a-Si:H Modules
Creators: name: Meyer, E.L.
name: Osayemwenre, G.O.
name: Taziwa, R.T.
name: Mamphweli, S.N.
Publisher: name: WIP
Year: 2015
Subjects: OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
PV Modules

description: 31st European Photovoltaic Solar Energy Conference and Exhibition; 1976-1979
description: The South African utility grid has been under severe pressure since 2008 due to, in part, lack of
expansion planning, aging infrastructure and a continued need for unscheduled maintenance shut downs. Since then
there has been a flooding of substandard, unregulated photovoltaic (PV) modules and balance of system (BOS)
components onto the lower end of the domestic market. These modules and components are being sold with the
assurance to provide electricity for domestic purposes, seemingly with no name plate rating of modules, system
sizing assistance, installation guidelines or after sales service. We have discovered these claims to be misleading. In
this regards, ten a-Si:H modules were obtained at a local hardware store and mounted at our outdoor research facility,
SolarWatt Park, on a north facing test rig tilted to the latitude of the site, 34o. For the purpose of this study, the
electrical performance of five of these modules was monitored. These measurements indicated a high variation in
both measured and STC corrected values of up to 30%. Analysis of the observed degradation showed a significant
33–35% decrease in performance, which is unacceptable. Within 2–4 days of outdoor deployment, some modules
even developed cracks on the front glass due to the cyclic daily thermal stresses. Furthermore, 3–D SEM coupled
with EDX for structural evaluation have revealed the presence of hotspots and the presence of foreign organic
substances in affected modules. FTIR analysis have also revealed that in addition to the a-Si:H bonds, foreign bonds
such as C=N, N=O and C=H were present. These developed due to the degradation of the EVA. Comparative TGA
analysis of the affected and non-affected regions has revealed high temperature volatization of the affected regions.
This is attributed to the absence of ethyl-vinyl acetate (EVA), which has already been degraded by the localized
heating caused by hotspot formation.
Computation of Controllable and Coobservable Sublanguages in Decentralized Supervisory Control via Communication
Creators: name: Komenda, Jan
name: Masopust, Tomáš
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optimization and Control (math.OC)
subject: Formal Languages and Automata Theory (cs.FL)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: In decentralized supervisory control, several local supervisors cooperate to accomplish a common goal (specification). Controllability and coobservability are the key conditions to achieve a specification in the controlled system. We construct a controllable and coobservable sublanguage of the specification by using additional communications between supervisors. Namely, we extend observable events of local supervisors via communication and apply a fully decentralized computation of local supervisors. Coobservability is then guaranteed by construction. Sufficient conditions to achieve the centralized optimal solution are discussed. Our approach can be used for both prefix-closed and non-prefix-closed specifications.
Spatial entanglement of nonvacuum Gaussian states
Creators: name: Kiałka, Filip
name: Ahmadi, Mehdi
name: Dragan, Andrzej
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The vacuum state of a relativistic quantum field contains entanglement between regions separated by spacelike intervals. Such spatial entanglement can be revealed using an operational method introduced in Ann. Phys. 351, 112 (2014), Phys. Rev. D 91, 016005 (2014). In this approach, a cavity is instantaneously divided into halves by an introduction of an extra perfect mirror. Causal separation of the two regions of the cavity reveals nonlocal spatial correlations present in the field, which can be quantified by measuring particles generated in the process. We use this method to study spatial entanglement properties of nonvacuum Gaussian field states. In particular we show how to enhance the amount of harvested spatial entanglement by an appropriate choice of the initial state of the field in the cavity. We find a counterintuitive influence of the initial entanglement between cavity modes on the spatial entanglement which is revealed by dividing the cavity in half.
description: 9 pages, 7 figures. Updated to match the published version