cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Influence of Short High Temperature Steps on the Regeneration of Boron-Oxygen Related Defects
Creators: name: Wilking, S.
name: Ebert, S.
name: Herguth, A.
name: Hahn, G.
Publisher: name: WIP
Year: 2013
Subjects: MATERIAL STUDIES, NEW CONCEPTS, ULTRA-HIGH EFFICIENCY AND SPACE TECHNOLOGY
Fundamental Material Studies

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 34-38
description: Boron-oxygen related recombination active defects typically limit solar cell efficiency in boron-doped
solar cells made from Czochralski grown silicon due to their detrimental effect on minority carrier lifetime. Lifetime
can be recovered by applying a regeneration procedure. The kinetics of this recovery process has been found to
depend considerably on the amount of hydrogen in the silicon bulk. Therefore, the influence of short high
temperature steps, which may affect the hydrogen bulk content, on the regeneration process is investigated. We found
that increasing peak temperature and increasing holding time at high temperatures results in a considerable
acceleration of the regeneration process. This could be correlated with the amount of hydrogen released from an
SiNx:H layer at high temperatures supporting the theory that the regeneration of boron-oxygen related defects might
in fact be a form of hydrogen defect passivation.
Screen Printed Silver Contact Mechanisms
Creators: name: Mikeska, K.R.
name: Carroll, A.F.
name: Cheng, L.K.
name: Li, Z.
Publisher: name: WIP
Year: 2013
Subjects: MATERIAL STUDIES, NEW CONCEPTS, ULTRA-HIGH EFFICIENCY AND SPACE TECHNOLOGY
Fundamental Material Studies

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 39-42
description: Recent improvements in screen-printed metallization contacts have allowed the solar cell industry to
move from highly doped emitters (HDE), designed to enable sufficiently low contact resistance, to lightly doped
emitters (LDE), which have much lower recombination velocities and lower saturation current. Without the improved
metallizations, technologies such as LDE could not be realized. In this paper we review the current understanding of
screen-printed silver-silicon contacts including new insights based on improved screen-printed solar cell contact and
performance.
Single NDMOS Integrated Smart Bypass for Partial Shading Power Loss Reduction
Creators: name: Bauwens, P.
name: Doutreloigne, J.
name: Govaerts, J.
Publisher: name: WIP
Year: 2013
Subjects: MATERIAL STUDIES, NEW CONCEPTS, ULTRA-HIGH EFFICIENCY AND SPACE TECHNOLOGY
Novel Materials and Concepts for Modules

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 55-58
description: The output power of PV systems can drop disproportionally due to differences in irradiance on PV cell level. The output current of the entire panel is limited by a single shaded cell. The power that is not delivered to the load is dissipated in the shaded cell, creating a hot spot that may permanently damage the panel. Traditionally this is solved by placing bypass diodes over a substring of cells. However, these diodes create a significant voltage drop when active, causing additional power loss. The Smart Bypass takes over the function of such a diode, while minimizing the dissipated power. It is a switch that is activated when the failing of a cell is detected. It periodically samples the state of the bypassed substring to check when the bypass can be deactivated. The Smart Bypass is a fully integrated system that works completely autonomously and does not need an external supply. The approach of creating such a switch using only one reverse blocking NDMOS allows the switch to be four times as small as a traditional switch with two serially placed MOSFETs. A Smart Bypass prototype was created with an on resistance of 0.15 for a current of 1A.
High Efficiency AlInGaP and AlInGaAs Solar Cells for 32% Four Junction Devices
Creators: name: Campesato, R.
name: Gori, G.
name: Greco, E.
name: Scaccabarozzi, A.
name: Binetti, S.
name: Le Donne, A.
Publisher: name: WIP
Year: 2013
Subjects: MATERIAL STUDIES, NEW CONCEPTS, ULTRA-HIGH EFFICIENCY AND SPACE TECHNOLOGY
Solar Cells, Modules and PV Systems for Space Applications

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 63-68
description: The technology involved in the realization of InGaP/InGaAs/Ge triple junction solar cells is well known and state of the art efficiencies above 30% in AM0 conditions have been achieved. To further improve conversion efficiency of multi-junction solar cells, many solutions have been proposed, mainly involving an increase of the number of junctions by a combination of semiconductors with different band-gaps. Aluminium Gallium Indium Phosphide (AlInGaP) and Aluminium Gallium Indium Arsenide (AlInGaAs) are among them. This combination leads to a theoretical estimate of 37% maximum efficiency under AM0 spectrum and an expected experimental 32% efficiency if electrical losses into the Al based materials are taken into account. InGaAs and Ge are already used in the current TJ solar cells structures. Past studies on AlInGaP demonstrated AM0 efficiencies as high as 13% for an Al content of 10% [2]. This paper reports the development of an Al(In)GaAs and AlInGaP sub-cell suitable to be used in high efficiency four junction solar cells.
Silicon Wafer-Based Tandem Cells: The Ultimate Photovoltaic Solution?
Creators: name: Green, M.A.
name: Hao, X.
name: Bremner, S.
name: Conibeer, G.J.
name: Al Mansouri, I.
name: Song, N.
name: Liu, Z.
name: Ringel, S.A.
name: Carlin, J.A.
name: Grassman, T.J.
name: Galiana, B.
name: Carlin, A.M.
name: Ratcliff, C.
name: Chmielewski, D.
name: Yang, L.
name: Mills, M.J.
name: Teeter, G.
name: Young, M.
Publisher: name: WIP
Year: 2013
Subjects: MATERIAL STUDIES, NEW CONCEPTS, ULTRA-HIGH EFFICIENCY AND SPACE TECHNOLOGY
New Materials and Concepts for Cells

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 7-10
description: On-going price reductions with wafer-based cells is making silicon technology increasing difficult to
dislodge. With market leaders expected to be manufacturing modules above 16% efficiency at $0.36/Watt by 2017,
even the cost per unit area ($60-$70/m2) will be difficult for thin-film technologies to significantly undercut. This
may make dislodgement likely only by appreciably higher energy conversion efficiency approaches. A silicon waferbased
cell able to capitalize on on-going cost reductions within the mainstream industry but with an appreciably
higher than present efficiency might therefore provide the ultimate PV solution. With average selling prices of 156
mm quasi-square monocrystalline Si wafers recently approaching $1 (per wafer), wafers now provide clean, low cost
templates for overgrowth of thin, wider bandgap high performance cells, nearly doubling silicon’s ultimate efficiency
potential. The range of Si-based tandem approaches are reviewed together with recent results and ultimate prospects.
A Degradation Analysis Model of Long-Term Outdoor Exposure for Ten Crystalline and Thin-Film Manufacturers under Similar Conditions for 1 Year and Comparison to Measurement Data
Creators: name: Johnson, L.P.
name: Nguyen, P.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3931-3935
description: An outdoor testing facility with ten crystalline and thin-film manufacturers was setup by SB Energy
Corporation in Obihiro, Hokkaido, Japan in 2011. The resultant data and information about array construction,
measurement and setup was made freely available and was streaming in real-time online. In 2012, for a period of oneyear,
the data was evaluated for this paper. A mathematical model was made to predict the amount of energy
generation in kWh for one-year of data based on New Energy and Industrial Technology Development Organization
(NEDO) public irradiance data. This model was checked with the actual output for each array in kWh in Hokkaido,
Japan and Sydney, Australia. The purpose was to increase understanding of module performance in harsh
environments and to increase the accuracy of assumption methodology for predicting energy yields of each
technology. Daily, monthly and yearly energy yield data was collected and analyzed from all ten photovoltaic arrays
representing all ten manufacturers. These arrays varied in size between 3-5kWp of crystalline silicon, amorphous
silicon tandem HIT (Hetro-junction with intrinsic Thin layer), CIS (Copper Indium Selenium) and a-Si/μc-Si
(amorphous silicon/micro-crystalline silicon tandem). Parameters such as kWh/kWp (energy production/peak rated
power), ambient temperature, and irradiance were reported. New information was gathered about seasonal fluctuation
of module kWh/kWp output and degradation factor in low temperature, high snow load environments and the
comparison of real measurement data vs. the model was checked. This is directly relevant for system integrators,
designers for increasing energy yield and economic payback for large-scale photovoltaic plants. It is important for
investors to check if their financial and energy yield modeling can be improved by incorporating the Japanese
industrial standard methodology into their models and by using more accurate de-rating factors, particularly in harsh
high- snow load environments.
Solving the small-scale structure puzzles with dissipative dark matter
Creators: name: Foot, Robert
name: Vagnozzi, Sunny
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Small-scale structure is studied in the context of dissipative dark matter, arising for instance in models with a hidden unbroken Abelian sector, so that dark matter couples to a massless dark photon. The dark sector interacts with ordinary matter via gravity and photon-dark photon kinetic mixing. Mirror dark matter is a theoretically constrained special case where all parameters are fixed except for the kinetic mixing strength, $ε$. In these models, the dark matter halo around spiral and irregular galaxies takes the form of a dissipative plasma which evolves in response to various heating and cooling processes. It has been argued previously that such dynamics can account for the inferred cored density profiles of galaxies and other related structural features. Here we focus on the apparent deficit of nearby small galaxies ("missing satellite problem"), which these dissipative models have the potential to address through small-scale power suppression by acoustic and diffusion damping. Using a variant of the extended Press-Schechter formalism, we evaluate the halo mass function for the special case of mirror dark matter. Considering a simplified model where $M_{\text{baryons}} \propto M_{\text{halo}}$, we relate the halo mass function to more directly observable quantities, and find that for $ε/10^{-10} \approx 2$ such a simplified description is compatible with the measured galaxy luminosity and velocity functions. On scales $M_{\text{halo}} \lesssim 10^8 \ M_\odot$, diffusion damping exponentially suppresses the halo mass function, suggesting a nonprimordial origin for dwarf spheroidal satellite galaxies, which we speculate were formed via a top-down fragmentation process as the result of nonlinear dissipative collapse of larger density perturbation. This could explain the planar orientation of satellite galaxies around Andromeda and the Milky Way.
description: About 20 pages
The Role of Entropy in the Limiting Efficiency of Exciton Fission Solar Cells: Can Tetracene be used?
Creators: name: Tayebjee, M.J.Y.
name: Clady, R.G.C.R.
name: Gray-Weale, A.A.
name: Mahboubi-Soufiani, A.
name: Conibeer, G.J.
name: Schmidt, T.W.
Publisher: name: WIP
Year: 2013
Subjects: MATERIAL STUDIES, NEW CONCEPTS, ULTRA-HIGH EFFICIENCY AND SPACE TECHNOLOGY
Fundamental Material Studies

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 14-19
description: We show that, by considering endothermic fission in a detailed balance formalism, the ultimate efficiency
of solar cells is increased from 41.9% to 45.9% under AM1.5G illumination. An equivalent circuit formalism is used to
elucidate this result. Endothermic fission has only been achieved at room temperature in organic materials such as
tetracene, and, using a semi-empirical approach, we calculate an efficiency limit of ~36% for a tetracene(100 nm)/ideal
inorganic absorber. Time-resolved photoluminescence studies are used to analyze the singlet fission mechanism in
tetracene thin films. We present evidence of the existence of a luminescent bound triplet pair state, whose dissociation is
thermally activated.
Non-radiating sources, dynamic anapole and Aharonov-Bohm effect
Creators: name: Nemkov, Nikita A.
name: Basharin, Alexey A.
name: Fedotov, Vassily A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that for a particular choice of gauge the vector potential of any non-radiating source is spatially localized along with its electric and magnetic fields. Important on its own, this special property of non-radiating sources dramatically simplifies the analysis of their quantitative aspects, and enables the interpretation of non-radiating sources as distributions of the elementary dynamic anapoles. Using the developed approach we identify and discuss a possible scenario for observing the time-dependent version of the Aharonov-Bohm effect in such systems.
description: 8 pages; v2: significantly revised, close to published version
Solar Radiation Estimate and Forecasting by Neural Networks for Smart Grid Energy Management
Creators: name: Di Piazza, A.
name: Di Piazza, M.C.
name: Vitale, G.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3876-3881
description: The high rate of penetration of renewable energy in the context of smart grids and distributed
generation makes the prediction of meteorological time series particularly useful for planning and management of the
power grid with the aim of improving its overall efficiency and performance. On such a basis, this paper proposes an
application of Artificial Neural Networks (ANNs) to the field of photovoltaic power generation. In particular, two
suitably trained dynamic recurrent ANNs, i.e., the Focused Time-Delay Neural Network (FTDNN) and the Nonlinear
autoregressive network with exogenous inputs (NARX), are used to develop a model for the estimate and forecast of
daily solar radiation. ANNs implemented in this study show good performance since reliable and precise models of
daily solar radiation, are obtained. This allows the PV output power for a given plant to be forecast as well. Finally,
the potential of the proposed method in optimal sizing and energy management of electrical grids is outlined showing
an example of NARX network application to electric load forecast.
Translational and rotational Brownian displacements of colloidal particles of complex shapes
Creators: name: Cichocki, B.
name: Ekiel-Jezewska, M. L.
name: Wajnryb, E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The exact analytical expressions for the time-dependent cross-correlations of the translational and rotational Brownian displacements of a particle with arbitrary shape were derived by us in [J. Chem. Phys. 142, 214902 (2015) and 144, 076101 (2016)]. They are in this work applied to construct a method to analyze Brownian motion of a particle of an arbitrary shape, and to extract accurately the self-diffusion matrix from the measurements of the cross-correlations, which in turn allows to gain some information on the particle structure. As an example, we apply our new method to analyze the experimental results of D. J. Kraft et al. for the micrometer-sized aggregates of the beads [Phys. Rev. E 88, 050301 (R) (2013)]. We explicitly demonstrate that our procedure, based on the measurements of the time-dependent cross-correlations in the whole range of times, allows to determine the self diffusion (or alternatively the friction matrix) with a much higher precision than the method based only on their initial slopes. Therefore, the analytical time-dependence of the cross-correlations serves as a useful tool to extract information about particle structure from trajectory measurements.
description: 4 pages, 2 figures
An Open-Source Simulation Tool of Grid-Connected PV Systems
Creators: name: Munoz, J.
name: Marroyo, L.
name: Collares-Pereira, M.
name: Tyutyundzhiev, N.
name: Conlon, M.
name: Elmoussaoui, A.
name: Wilkin, B.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3882-3887
description: This paper presents the features, models, and calculation procedures implemented in an open-source
simulation tool of grid-connected PV systems, which is being developed under the support of a European project.
Simulations may be carried out with different time series of input data coming from the monitoring of PV systems,
ground-based weather stations, satellite measurements or popular databases. Besides, the tool may also generate the
required time series starting from monthly averages of irradiance and ambient temperature values. Models of
components are mainly based on standard information, provided by manufacturers or promoters, which may be
verified experimentally by on-site quality control testing procedures. Among other simulation options, it is possible to
select between three static PV generators (ground, roof or façade) or six trackers (with/without backtracking), and to
carry out different types of analysis (sweep, parametric, ensembles, etc.). The tool provides, among other simulation
results, the energy yield, the analysis and breakdown of energy losses, and the estimations of financial returns
adapted to the legal and financial frameworks of each European country. Besides, educational facilities will be
developed and integrated in the tool, not only devoted to learn how to use the software, but also to train the users on
the best design PV systems practices.
Experimental Validation of Solar Resource Assessment Methodologies
Creators: name: Richter, M.
name: Gonzalez Moya, T.
name: Morilla Padial, C.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3909-3914
description: This works reviews the different methodologies and the associated uncertainties in the estimation of the
solar resource and the energy yield of a potential solar plant. The experimental analysis of energy production data
from a group of plants operating for an average of 2-3 years under different meteorological conditions is used to
analyse the accuracy of the procedures followed to estimate their performance at the design phase. Five
meteorological data sources and the statically combination of them (3E Methodology) are compared to each other and
against reference irradiation databases from meteorological institutions. The results propose recommendations to
improve the reliability of P90/P50 predictions by reducing the associated uncertainties whenever possible. Deviations
in the order of -2% to -3% from the experimental Performance Ratio (PR) where observed. These deviations were
found to be mainly caused by assumptions on parameters estimated during the design phase of the photovoltaic (PV)
plant. It is shown how statistical techniques applied to reduce the uncertainty and improve the estimation of the longterm
Global Horizontal Irradiation (GHI) can lead to highly accurate results.
Project BIPV-CHARM: Building Integrated Photovoltaics – Characterisation, Performance Assessment and Monitoring
Creators: name: O'Nagy, O.
name: Koster, D.
name: Minette, F.
name: Hervieu, J.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3896-3908
description: At present times PV technology is available for a small fraction of that price which needed to be paid a
few years ago [1]. This fact and the lack of suitable land in and around urban areas make it economically viable
integrating PV modules in building elements, which may be not optimally oriented and -even more important- do not
allow a good cooling of the solar cells. This causes operating modi far from standard test conditions (STC). The
knowledge about the operation mode under such different (from STC) conditions is essential in order to achieve the
best possible energy gain coupled to a reasonable economical pay-back time. There is a large variety in solar cell
technology and module designs available for building integrated (BIPV) applications. The BIPV-CharM project tries
to identify exceptional characteristics of different technologies during the operation under real outdoor conditions and
develop methods to evaluate their appropriateness for specific installation situations.
It is commonly known that the characterisation of BIPV modules must also take into account the fact that the
installation within a building shell has a larger influence on the thermal performance than it would have for building
attached or free-standing PV installations. Furthermore each single BIPV installation is a unique construction, as
buildings are usually individually designed objects. These facts make it hardly possible to accurately estimate the
thermal performance of an individual BIPV module array. The technical approach of this project is focussing on the
characterisation of single BIPV modules (not arrays) under well-defined installation conditions. The results are
representing the limits of the thermal performance under real conditions.
Utility-Scale Energy Storage Technology
Creators: name: Patey, T.
name: Buehler, T.
name: Chartouni, D.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System and Grid Integration Aspects

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3836-3840
description: Utility-scale energy storage technologies provide a number of solutions for challenges associated with
the intermittency of PV and other forms of renewable power generation. Energy storage systems have always been a
central grid component, as pumped hydro storage has provided load leveling for generation utilization for decades.
But as the grid transforms from one based on centralized, thermal power to one based on distributed, renewable
power, the role of energy storage in the power grid will change. Sodium sulfur, Li-ion, and lead acid battery energy
storage systems are playing an increasingly important role in dealing with the challenges presented by renewable
power generation. This work provides an overview of these challenges, how energy storage provides solutions, how
leading energy storage technologies compare to one another, and gives an outlook into new technologies.
Experimental Comparison of Different Global Irradiation Models with and without Sun Tracking for the South of Spain
Creators: name: Lillo Bravo, I.
name: Silva Pérez, M.
name: Larrañeta Gómez-Caminero, M.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3852-3854
description: It is very unusual to have global irradiance data for a tilted surface and even more for a surface with a
perfect sun tracking. The most common available data is the global horizontal irradiance, thus it is necessary to convert
the available data into the desirable inclination. The purpose of this paper is to analyse the different response of the
radiation models that are used to calculate the global irradiance in static surfaces and in surfaces with a perfect sun
tracking (two axis). For that end 10 years of measured data has been utilized. The combination of methods that better
approaches to the experimental values is the one formed by Orgill - Hollands and Perez for stationary surfaces and mode-
Temps-Coulson for two-axis tracking.
A Case Study for Micro-Grid PV: Lessons Learned from a Rural Electrification Project in India
Creators: name: Loka, P.
name: Moola, S.
name: Polsani, K.
name: Reddy, S.
name: Fulton, S.
name: Skumanich, A.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV Applications without a Centralised Grid

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3823-3830
description: Micro-grids in developing countries present a significant application opportunity for PV as a energy
enabling technology. The authors project 10GW for this application in the next decade. The growth of this sector
will be enhanced by shared learning of the best practices. The authors are part of a team which successfully installed
1/3MW in micro-grids and present the lessons learned and a useful methodology for determining key metrics. The
PV is part of the rural electrification in India, and is representative of current global PV micro-grids. This project
provides basic lighting and electricity for 57 villages in India. The project was done with a goal of optimizing power
against cost. Various metrics are presented: costs, time, O&M, and performance. Also discussed are:
implementation strategies for cost containment, post-install support and user payment collection. The demand
capacity level is examined in detail, with modeling used to identify an optimal expansion under cost constraints. The
combination of real data and modeling is a useful approach for PV and micro-grid optimization. This case study
quantitatively supports the value of the use of PV for rural electrification. This case highlights the significant
opportunity for PV in the global micro-grid electrification context.
UniSAFE: National University Of Ireland, Galway – institutional policy to address gender-based violence
Creators: name: Andreska, Zuzana
name: Huck, Averil
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.
N=3 four dimensional field theories
Creators: name: García-Etxebarria, Iñaki
name: Regalado, Diego
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We introduce a class of four dimensional field theories constructed by quotienting ordinary $\mathcal{N}=4$ $U(N)$ SYM by particular combinations of R-symmetry and $SL(2,\mathbb{Z})$ automorphisms. These theories appear naturally on the worldvolume of D3 branes probing terminal singularities in F-theory, where they can be thought of as non-perturbative generalizations of the O3 plane. We focus on cases preserving only 12 supercharges, where the quotient gives rise to theories with coupling fixed at a value of order one. These constructions possess an unconventional large $N$ limit described by a non-trivial F-theory fibration with base $AdS_5\times (S^5/\mathbb{Z}_k)$. Upon reduction on a circle the $\mathcal{N}=3$ theories flow to well-known $\mathcal{N}=6$ ABJM theories.
description: 22 pages, 2 figures. v2: fixed orientifold charges, added references, v3: added references
title: Invariant Set-based Methods for the Computation of Input and Disturbance Sets
Creators: name: Mulagaleti, Sampath Kumar
Publisher: name: IMT Alti Studi Lucca
Year: 2023

description: This dissertation presents new methods to synthesize disturbance sets and input constraints set for constrained linear time-invariant systems. Broadly, we formulate and solve optimization problems that (a) compute disturbance sets such that the reachable set of outputs approximates an assigned set, and (b) compute input constraint sets guaranteeing the stabilizability of a given set of initial conditions. The proposed methods find application in the synthesis and analysis of several control schemes such as decentralized control, reduced-order control, etc., as well as in practical system design problems such as actuator selection, etc. The key tools supporting the develpment of the aforementioned methods are Robust Positive Invariant (RPI) sets. In particular, the problems that we formulate are such that they co-synthesize disturbance/input constraint sets along with the associated RPI sets. This requires embedding existing techniques to compute RPI sets within an optimization problem framework, that we facilitate by developing new results related to properties of RPI sets, polytope representations, inclusion encoding techniques, etc. In order to solve the resulting optimization problems, we develop specialized structure-exploiting solvers that we numerically demonstrate to outperform conventional solution methods. We also demonstrate several applications of the methods we propose for control design. Finally, we extend the methods to tackle data-driven control synthesis problems in an identification-for-control framework.
From BIPV to Building Component
Creators: name: Frontini, F.
name: Scognamiglio, A.
name: Graditi, G.
name: Polo López, C.
name: Pellegrino, M.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV as Building Material Component

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3757-3761
description: The present need to, dramatically, increase the renewable part of our energy supply is now pushing to maximize the
Photovoltaics (PV) use on the building skins, making architectural and building integration a key issue. This will
have an impact both in the building’s design by reducing the energy need by the building itself, and in the diffusion
of renewable energies on site (near-by), which will produce the remaining part of energy if it is needed. PV will be
gaining more and more relevance in the NZEBs design, thanks to its features and potentialities. “BIPV” is for
technicians a well-known acronym to indicate PV module used in/on building when PV modules replace part of the
traditional building elements of the envelope. Despite the discussion has been treated in several international projects
and research programmes, settled up to find a common definition of BIPV and to help the PV manufactures to
produce new innovative module suitable for their use in buildings, PV module are still not used on large scale in
building and often are not considered at all by architect and designer as a further option in their projects.
The paper tries to underline what are the main causes of this slowdown in the use of PV as building component.
Possible solution are also presented especially in order to gives the main stakeholder affordable information of PV
module as for a common building component. This paper will start from a review of current definitions used in the
field of the use of PV in buildings, and will identify needs for further research. The starting point will be the
experience of the authors in several international research project, in the International Energy Agency (SHC Task 41
Solar Energy and Architecture; SHC-ECBCS Task 40-Annex 52 Towards Net Zero Energy Solar Buildings) and, in
particular, the participation in the EU 7th FP project “Construct PV”.
Spectral analysis of the Dirac operator on a 3-sphere
Creators: name: Fang, Yan-Long
name: Levitin, Michael
name: Vassiliev, Dmitri
Publisher: name: arXiv
Year: 2016
Subjects: subject: Spectral Theory (math.SP)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35Q41 (primary), 35P15, 58J50, 53C25 (secondary)

description: We study the (massless) Dirac operator on a 3-sphere equipped with Riemannian metric. For the standard metric the spectrum is known. In particular, the eigenvalues closest to zero are the two double eigenvalues +3/2 and -3/2. Our aim is to analyse the behaviour of eigenvalues when the metric is perturbed in an arbitrary smooth fashion from the standard one. We derive explicit perturbation formulae for the two eigenvalues closest to zero, taking account of the second variations. Note that these eigenvalues remain double eigenvalues under perturbations of the metric: they cannot split because of a particular symmetry of the Dirac operator in dimension three (it commutes with the antilinear operator of charge conjugation). Our perturbation formulae show that in the first approximation our two eigenvalues maintain symmetry about zero and are completely determined by the increment of Riemannian volume. Spectral asymmetry is observed only in the second approximation of the perturbation process. As an example we consider a special family of metrics, the so-called generalized Berger spheres, for which the eigenvalues can be evaluated explicitly.
description: Slightly extended text with updated bibliography
The Balance between Aesthetics and Performance in Building-Integrated Photovoltaics in the Tropics
Creators: name: Zomer, C.
name: Nobre, A.
name: Cassatella, P.
name: Reindl, T.
name: Rüther, R.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV and Architecture

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3779-3787
description: This paper aims at investigating if the balance between aesthetics and performance in building-integrated
photovoltaic (BIPV) systems is possible to be achieved in the tropics. To accomplish this objective, three BIPV systems
located in Singapore with photovoltaic (PV) systems playing an aesthetically appealing role in their architecture were
analysed in detail for a one-year period. The systems were analysed regarding the available solar irradiation, the shading
profiles and the resulting yield and performance ratio (PR) in order to compare the performance of different subsystems
with variable architectural characteristics and string configurations. All systems are partially shaded in the early morning
or late afternoon, a common situation inherent to BIPV systems. Results show that even with a theoretical non-optimal
combination of azimuthal deviations and tilt angles, some PV systems show better performances in terms of yield and
performance ratio than those which are installed at more ideal conditions. The high ratio of diffuse irradiation in
Singapore; the distance of shading obstacles and times when shading occurs; and the subsystem and string configurations
strongly influence the systems performance results. With the declining costs of PV systems, BIPV can offer attractive
solutions with high integration appeal, architectural sophistication and the promotion of sustainable energy supply. In the
tropics, roof-top BIPV systems can perform with relatively small losses and be aesthetically appealing when compared
with optimally tilted and oriented PV generators.
On two cohomological Hall algebras
Creators: name: Yang, Yaping
name: Zhao, Gufang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Representation Theory (math.RT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We compare two cohomological Hall algebras (CoHA). The first one is the preprojective CoHA introduced by the authors in arXiv:1407.7994 associated to each quiver Q, and each algebraic oriented cohomology theory A. It is defined as the A-homology of the moduli of representations of the preprojective algebra of Q, generalizing the K-theoretic Hall algebra of commuting varieties of Schiffmann-Vasserot. The other one is the critical CoHA defined by Kontsevich-Soibelman associated to each quiver with potentials. It is defined using the equivariant cohomology with compact support with coefficients in the sheaf of vanishing cycles. In the present paper, we show that the critical CoHA, for the quiver with potential of Ginzburg, is isomorphic to the preprojective CoHA as algebras. As applications, we obtain an algebra homomorphism from the positive part of the Yangian to the critical CoHA.
description: V2: Significant expositional changes, final version, 22 pages. V1: This paper contains Sections 8 and 9 of arXiv:1407.7994V4, which is now split as two independent papers. 26 pages
At most 64 lines on smooth quartic surfaces (characteristic 2)
Creators: name: Rams, Slawomir
name: Schütt, Matthias
Publisher: name: arXiv
Year: 2015
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Let K be a field of characteristic 2. We give a geometric proof that there are no smooth quartic surfaces in IP^3 with more than 64 lines (predating work of Degtyarev which improves this bound to 60). We also exhibit a smooth quartic containing 60 lines which thus attains the record in characteristic 2.
description: 16 pages; v2: minor additions and edits, reference to 1604.05836 added
Maximum Energetic Yield Beyond MPP
Creators: name: Laschinski, J.
name: Hartmann, M.
name: Straub, T.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3660-3662
description: Since configuration of the first PV systems nearly everything has changed in plant design. However some rules are
still valid and no one intended to touch them up to now. A typical PV plant is thus designed for continuously
operation at MPP to reach high reliability and maximum energy yield of panel field. But does this strategy lead to the
maximum energy yield of the complete system as well?
PV voltage operating range has strong influence on energetic yield and profitability of the system comparable to that
of Nominal Power Ratio [1]. For example it is the main criterion for the applicability of specific inverter topologies
with high efficiency only working in a very narrow MPP voltage range [2]. This was the motivation to examine the
validity of common voltage design rules.
Operational behavior and energetic yield of PV systems operating at the lower voltage limit has been investigated and
evaluated. Surprisingly the clear result is contradictory to common sizing rules. It seems to be more profitable not to
operate a PV system in MPP all the time! Based on these results new and simple design rules have been derived,
allowing for the first time the determination of an energetic optimized voltage range.
Energetic, electronic and magnetic properties of Mn-dimers on reconstructed (001) GaAs surfaces
Creators: name: Birowska, M.
name: Śliwa, C.
name: Majewski, J. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences
subject: J.2
subject: 74A50, 74E15

description: We study energetic, magnetic, and electronic properties of diluted substitutional Mn-pairs on the reconstructed $(001)$ GaAs surfaces. The studies are based on first-principles calculations in the framework of the density functional theory. We demonstrate that the stability of the systems strongly depends on the position, orientation, and the distance between the Mn-atoms constituting the pair. Independently of the considered surface reconstruction pattern, the Mn-pairs with Mn-atoms being the nearest neighbors (NN) on cationic sublattice turn out to be energetically more favorable than the pairs with the larger distance between the Mn-atoms. However, the preferential build-up orientation of the Mn-NN-pair depends on the surface reconstruction and is parallel either to $[110]$ or $[1\bar{1}0]$ crystallographic direction. We reveal also the mechanisms of the magnetic ordering of Mn-NN-pairs. The Mn-NN-pairs along the $[110]$ crystallographic direction exhibit always ferromagnetic alignment of Mn spins, whereas the spins in the Mn-NN-pairs along $[1\bar{1}0]$ direction are mostly anti-ferromagnetically aligned. In the electronic structure of the systems containing Mn-pairs with ferromagnetically aligned spins, we observe the valence band hole states in the neighborhood of Fermi energy. This indicates that the surface ferromagnetism in this prototype of dilute magnetic semiconductors can be explained in terms of the $p$-$d$ Zener model.
description: 16 pages, 14 figures, 4 tables
The Flavoured BFSS Model at High Temperature
Creators: name: Asano, Yuhma
name: Filev, Veselin G.
name: Kováčik, Samuel
name: O'Connor, Denjoe
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the high temperature series expansion of the Berkooz-Douglas matrix model which describes the D0/D4--brane system. At high temperature the model is weakly coupled and we develop the series to second order. We check our results against the high temperature regime of the bosonic model (without fermions) and find excellent agreement. We track the temperature dependence of the bosonic model and find backreaction of the fundamental fields lifts the zero temperature adjoint mass degeneracy. In the low temperature phase the system is well described by a gaussian model with three masses $m^t_A=1.964 \pm 0.003$, $m^l_A=2.001 \pm 0.003$ and $m_f=1.463 \pm 0.001$, the adjoint longitudional and transverse masses and the mass of the fundamental fields respectively.
description: 36 pages 11 figures and tables; v2: major revision for clarification, numerical results updated and typos corrected
Solar-PV-Meter
Creators: name: Nielsen, K.P.
name: Wilke, G.
name: Larsen, L.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3663-3665
description: Solar-PV-Meter is an advanced web-service
that enables current and coming photovoltaic installation
owners to analyze and monitor the performance ratio for
the actual meteorological solar conditions. With both
analysis of the coming potentially available solar energy,
and monitoring of the currently produced DC and AC
power. Satellite data are used for evaluating the global
and diuse irradiances. From these a shadow mask is derived
to account for shading objects.
Classical deformations of noncompact surfaces and their moduli of instantons
Creators: name: Barmeier, Severin
name: Gasparim, Elizabeth
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: High Energy Physics - Theory (hep-th)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 32G05 (Primary), 14D21, 14J60 (Secondary)

description: We describe semiuniversal deformation spaces for the noncompact surfaces $Z_k := \operatorname{Tot} (\mathcal O_{\mathbb P^1} (-k))$ and prove that any nontrivial deformation $Z_k (τ)$ of $Z_k$ is affine. It is known that the moduli spaces of instantons of charge $j$ on $Z_k$ are quasi-projective varieties of dimension $2j-k-2$. In contrast, our results imply that the moduli spaces of instantons on any nontrivial deformation $Z_k (τ)$ are empty.
description: 15 pages
The Evaluation of PV Power Plants: Testing Procedures According to Italian Regulations
Creators: name: Guastella, S.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3714-3718
description: The success of PV power plants is strongly depending on the quality of their project and realization.
Precise analyses of the technical characteristics and of the performance behaviors are, then, crucial for evaluating the
quality of a PV power plant. Nevertheless, the methods to make these analyses are not covered by suitable
international standards and the plant quality is not subject of certification. As consequence, PV operators are
currently adopting procedures which are based on their best practices and/or on contractual agreements. Specific
testing procedures, published by Italian CEI in the Guide 82-25, overcome this problem and allow to evaluate the
quality of PV plants, taking into account the requirements of the "Conto energia" incentive Programme. These
procedures have been adopted by RSE performing tests on large Italian PV plants and the experience, gained during
these tests, confirms the effectiveness of this approach, which should be useful both for PV operators and for PV
international community, supplying a contribution at the development of standards and certification procedures.
A new bicommutant theorem
Creators: name: Farah, Ilijas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Operator Algebras (math.OA)
subject: Logic (math.LO)
subject: FOS: Mathematics

description: We prove an analogue of Voiculescu's theorem: Relative bicommutant of a separable unital subalgebra $A$ of an ultraproduct of simple unital C*-algebras is equal to $A$.
description: Minor corrections and clarifications. To appear in Pacific J. Math
Shortest Term Regional Solar Energy Forecast for the Next 1 to 6 Hours
Creators: name: Müller, S.C.
name: Remund, J.
Publisher: name: WIP
Year: 2013
Subjects: PV SYSTEMS
PV System Reliability and Availability

description: 28th European Photovoltaic Solar Energy Conference and Exhibition; 3636-3637
description: A model for shortest term regional solar energy forecasting has been developed within a project in
Switzerland. A combination of satellite images and wind field of a numerical weather model allows a forecast of the
actual cloud state and thus a forecast of the solar irradiation of the ground. This technique has shown that an
improvement to common forecasts based on numerical weather prediction models up to 6 hours of 30% can be
reached. Uncertainty levels for Switzerland ranges from 20% up to 60% depending on forecast horizon, altitude and
season. With an update cycle of 15 minutes the model serves for intra-day actions like trading or grid stability issues.
Rapid repair of percutaneous endoscopic gastrostomy tubes using three-dimensional printing: A case series
Creators: name: O'Sullivan, Kevin
name: O'SULLIVAN, AIDAN
name: Kermavnar, Tjaša
name: McNally, Paul
name: DUNNE, COLUM
name: Linnane, Barry
name: O'SULLIVAN, LEONARD
Publisher: name: University of Limerick
Year: 2023
Subjects: classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences
classificationCode: 401001
subject: Engineering design

description: Presented are four cases involving urgent interventions to repair PEG tube failures in PEG dependent patients. We report on the practical utility of 3D printed devices designed for contingency repair of pediatric PEG tubes when other options, including surgical approaches or manufacturer supplied repairs, were not possible. The patients were dependent on PEG for nutrition and/or medication, treated at the University Hospital Limerick or Children’s Hospital Ireland − Crumlin, Ireland. Each were unsuitable for surgery. PEG tube fractures occurred in 4 children (2 female, 2 male; aged 6−15 years) with chronic complex medical conditions at 5-6 years dwell time. In each case novel sealing devices were created and customized to address fractured PEG tubes. The designs were 3D printed using biocompatible materials. The PEG tube fractures were effectively sealed with the 3D printed devices within 24 h, and tube potency was completely restored in one case for up to 205 days.