cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Επιτήρηση της λοίμωξης από Clostridioides difficile σε νοσηλευόμενους ασθενείς σε κέντρο αποκατάστασης
Creators: name: Χαρίση, Ελιάνα Σπύρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2024
Subjects: Λοίμωξη από Clostridioides difficile
Επιτήρηση
Επίπτωση της CDI
Clostridioides difficile infection, CDI
Surveillance
Incidence of CDI

description: Σκοπός της παρούσας διπλωματικής εργασίας ήταν η διερεύνηση της ετήσιας επίπτωσης της CDI μετά την COVID-19 πανδημία και η εξάμηνη επιτήρηση της σε νοσηλευόμενους ασθενείς σε Κέντρο Αποκατάστασης. Πραγματοποιήθηκε μελέτη παρατήρησης (Ιανουάριος 2023–Δεκέμβριος 2023) και επιτήρηση της CDI για διάστημα 6 μηνών (Ιούλιος 2023-Δεκεμβριος 2023). Συνολικά εξετάστηκαν 480 ασθενείς με διάρροιες, για λοίμωξη από C. difficile. Ελέγχθηκαν τα επιδημιολογικά δεδομένα 60 ασθενών με επιβεβαιωμένη CDI κατά το 6μηνο διάστημα της επιτήρησης. Η εργαστηριακή διάγνωση της CDI έγινε αρχικά με την μέθοδο της ανοσοχρωματογραφίας που στοχεύει στην ανίχνευση της γλουταμινικής δεϋδρογενάσης και των τοξινών Α/Β. Ακολούθησε ειδική αναερόβια καλλιέργεια, μοριακός έλεγχος ανίχνευσης τοξινογόνου C. difficile και ριβοτυποποίση (PCR ribotyping) των απομονωθέντων στελεχών C. difficile. Έγινε καταγραφή της επίπτωσης της CDI σε μηνιαία βάση, επεξεργασία εργαστηριακών, δημογραφικών και κλινικών δεδομένων των ασθενών και στατιστική ανάλυση με SPSS.
description: The aim of this study was to investigate the annual incidence of CDI after the COVID-19 pandemic and to conduct a 6-month CDI surveillance in hospitalized patients in a rehabilitation center. An observational study (January 2023-December 2023) and a 6-month surveillance of CDI (July 2023-December 2023) were performed. A total of 480 patients with diarrhea were screened for C. difficile infection. The epidemiological data of 60 patients with confirmed CDI during the 6-month surveillance period were reviewed. Laboratory diagnosis of CDI was initially made by immunochromatographic test, used to detect glutamate dehydrogenase (GDH) and A/B toxins. This was followed by specific anaerobic culture, molecular testing for detection of toxigenic C. difficile, and PCR ribotyping of the isolated C. difficile strains. The incidence of CDI was recorded monthly, while laboratory, demographic, and clinical data of the patients were also processed. Statistical analysis of the data was performed by using SPSS.
Research_paper_on_Graph_Products_of _Cayley_Graphs_of_Semigroups.pdf
Creators: name: S PANICKER, UMA
Publisher: name: figshare
Year: 2023
Subjects: Applied mathematics not elsewhere classified

description: In this paper, we discuss the graph products such as Cartesian products and Tensor products in Cayley graphs of Semigroups. We see that any Rook’s graph with an even number of vertices is isomorphic to the cartesian product of induced subgraphs of Cayley graph of multiplicative semigroup Zn relative to its group of units G
Distanz
Creators: name: Von Brevern, Jan
name: Degler, Anna
Publisher: name: 21: Inquiries into Art, History, and the Visual
Year: 2023

description: 21: Inquiries into Art, History, and the Visual, Vol. 4 No. 3 (2023): 21: Inquiries into Art, History, and the Visual. Beiträge zur Kunstgeschichte und visuellen Kultur
First Year Performance Results From a Unique Micro-Cell Based HCPV RD&D System Installed in Tucson, Arizona
Creators: name: Burroughs, S.
name: Ghosal, K.
name: Krause, P.
name: Fiedler, M.
Publisher: name: WIP
Year: 2011
Subjects: Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Terrestrial Concentrator Systems

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 172-175
description: A massively parallel -transfer printing process has been used as the foundation for the design of a
high efficiency and low cost High Concentration Photovoltaic (HCPV) module. An array of these engineering
prototype modules have been installed in a Research Development & Demonstration (RD&D) system in Tucson, AZ
with the objective of 1) demonstrating the viability of the design, 2) assessing the reliability of the system in a hot
sunny desert-like climate, and 3) collecting on-sun data to better understand how the system performs in different
conditions. The first year of on-sun data will be presented. The results show that the annualized energy yield from
the system was 2503 kWh/kWP. This result compares remarkably well with a PV Watts model which predicted 2561
kWh/kWP.
Dynamics of Circumstellar Disks III: The case of GG Tau A
Creators: name: Nelson, Andrew F.
name: Marzari, F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: (abridged) We present 2-dimensional hydrodynamic simulations using the Smoothed Particle Hydrodynamic (SPH) code, VINE, to model a self-gravitating binary system similar to the GG Tau A system. We simulate systems configured with semi-major axes of either $a=62$~AU (`wide') or $a=32$~AU (`close'), and with eccentricity of either $e=0$ or $e=0.3$. Strong spiral structures are generated with large material streams extending inwards. A small fraction accretes onto the circumstellar disks, with most returning to the torus. Structures also propagate outwards, generating net outwards mass flow and eventually losing coherence at large distances. The torus becomes significantly eccentric in shape. Accretion onto the stars occurs at a rate of a few $\times10^{-8}$\msun/yr implying disk lifetimes shorter than $\sim10^4$~yr, without replenishment. Only wide configurations retain disks by virtue of robust accretion. In eccentric configurations, accretion is episodic, occurs preferentially onto the secondary at wrates peaked near binary periapse. We conclude that the \ggtaua\ torus is strongly self gravitating and that a major contribution to its thermal energy is shock dissipation. We interpret its observed features as manifestations of spiral structures and the low density material surrounding it as an excretion disk created by outward mass flux. We interpret GG Tau A as a coplanar system with an eccentric torus, and account for its supposed mutual inclination as due to degeneracy between the interpretation of inclination and eccentricity. Although the disks persist for long enough to permit planet formation, the environment remains unfavorable due to high temperatures. We conclude that the GG Tau A system is in an eccentric, $a\sim62$~AU orbit.
description: Accepted for publication in the Astrophysical Journal
Higher System Efficiency in Three Phase Plants Through System Voltages Above 1000 V
Creators: name: Burger, B.
name: Goeldi, B.
name: Laukamp, H.
name: Schmidt, H.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Components for PV Systems
Balance of System Components

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 2755-2757
description: Single-phase transformerless inverters have reached 98 % efficiency. A single-phase inverter with a PV generator voltage of 350 V and higher, has the advantage that PWM switching can be performed directly in the power bridge and no boost converter for DC voltage adjustment is required. Typical three-phase transformerless inverters integrate a boost converter, which steps-up the voltage of the PV generator to the voltage necessary for the inverter bridge (e.g. 700 V). Removal of the boost converter would improve the common efficiency of 96 % by around 2 %, reduce weight and save costs of about 15 to 30 %. That means, however, that the maximum power point (MPP)-voltage of the PV generator must always be above 700 V. This can lead to an open circuit voltage of over 1000 V. However, currently available PV modules and BOS components are certified to a maximum system voltage of 1000 V due to existing standards. A change of the electric codes to an upper voltage limit of 1500 V is proposed.
Development and Evaluation of the Institutionally Farmed Research On-line Repository and Management System (InFORMs) towards Knowledge-Sharing and Utilization
Creators: name: Javier, Billy S.
name: Paliuanan, Leo P.
name: Talamayan, Corazon T.
name: Agpalza, James Karl A.
name: Agoto, Jesty S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computers and Society (cs.CY)
subject: Databases (cs.DB)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences
subject: H.4.3; H.3.5; J.1
subject: 68P20

description: This paper presents the usability, acceptability and extent of compliance to ISO 25010:2011 of the developed project InFORMS. Key features that aid in the ease of use, access to, and management of the research resource emerged. From the responses, the developed application evidently suggests its usability and compliance to standards from the participants. The application was limited to showcasing all research resources produced in the University, in the last 10 years, after having gone through approval of the research review committee prior inclusion in the database. Maximizing the web application for knowledge-sharing and utilization is commended, advancing instruction and knowledge economy.
description: The article is contained in 7 pages, reviewed by 3 external peer reviewers, and published by the International Journal of Computer Science and Network Security - an online journal subscribed in the Web of Science - ESCI
Rear Junction Epitaxial Thin Film Solar Cells with Diffused Front Surface Field and Porous Silicon Back Reflectors
Creators: name: Kuzma Filipek, I.
name: Récaman-Payo, M.
name: Van Nieuwenhuysen, K.
name: Van Hoeymissen, J.
name: Beaucarne, G.
name: Van Kerschaver, E.
name: Poortmans, J.
name: Mertens, R.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Thin Film Crystalline Silicon Solar Cells and Wafer Equivalents

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2584-2588
description: Thin film silicon solar cells, consisting of an epitaxially grown active (base) layer deposited on a low
quality, highly doped silicon substrate, are considered as a future alternative to crystalline bulk silicon cells
incorporating many of the technologically attractive features. One of the benefits of these thin film epitaxial solar cells
lies in the reduced consumption of high purity silicon feedstock. Moreover this technology enables a high degree of
freedom regarding the design of the solar cell structure, since it can make use of unrestricted doping profiles and full
solar cell diode stacks including emitters by chemical vapour deposition (CVD) processes as well as incorporation into
the cell structure of intermediate processing steps prior epitaxial layer deposition. One of such intermediate step is
implementation of the porous silicon optical reflector beneath the epi layer, reflecting low energy photons back to the
active epitaxial layer. Another aspect of this work is to demonstrate a cell design where the emitter is situated at the rear
of the cell directly on top of the reflector and is grown in situ by CVD technique. The purpose of this work is therefore
twofold. A first aim is to demonstrate the use of such rear emitter epitaxial cell and show a proof of concept in
comparison with the conventional cell with the junction at the front. On the other hand, we will discuss the issues
associated with the introduction of such a concept together with the reflector in thin film technology and indicate
possible improvement in cell design by PC1D simulations.
Optimisation Towards High-Efficiency 30cmx30cm-Size Cu(In,Ga)Se2 Solar Cells Using an In-Line Co-Evaporation System
Creators: name: Wei, Z.
name: Shimell, T.
name: Upadhyaya, H.M.
Publisher: name: WIP
Year: 2011
Subjects: Thin Film Solar Cells
CIS and Related Ternary and Quaternary Thin Film Solar Cells

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 2840-2844
description: The current commercial Cu(In,Ga)Se2 (CIGS) technology is moving towards large-area, high-quality
films. This is faced by up-scaling problems includes in achieving acceptable thickness and composition uniformity,
reproducibility and high throughput. A pilot scale in-line system capable of handling 30cmx30cm has been developed
which addresses the up-scaling issues on CIGS, such as uniformity of composition and thickness of various layers.
These issues along with design and optimization of process have been attempted using a thickness distribution model
of evaporated films which predicts and validates the results. In present studies utilizes the co-evaporated layers of Cu,
In and Ga from three pairs of point sources at low substrate temperature of 20 ºC over Mo coated glass across
30cmx30cm area, and then they were selenized in a quartz tube at high substrate temperature at 500 ºC. The obtained
samples of CIGS layers were processed to a complete solar cell by growing a CdS buffer layer and a i-ZnO/Al:ZnO
front contact. The preliminary and un-optimised results showed an efficiency of 3.0%. A photo-electrochemical
(PEC) characterization viz. Mott-Schottky plots was performed on the CIGS/H2SO4 system, which indicates p-type
conductivity of CIGS layer with acceptor concentration -3.7x1017 cm-3 and flat band potential -0.27 V vs. NHE. The
studies have been planned to evaporate the Cu, In, and Ga with help of the in-line system using integrated one linear
Se source via a multiple-stage co-evaporation process for the 30cmx30cm soda-lime glass substrates to achieve
higher efficiency.
Microwave imaging of a hot flux rope structure during the pre-impulsive stage of an eruptive M7.7 solar flare
Creators: name: Wu, Z.
name: Chen, Y.
name: Huang, G.
name: Nakajima, H.
name: Song, H.
name: Melnikov, V.
name: Liu, W.
name: Li, G.
name: Chandrashekhar, K.
name: Jiao, F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Corona structures and processes during the pre-impulsive stage of solar eruption are crucial to understanding the physics leading to the subsequent explosive energy release. Here we present the first microwave imaging study of a hot flux rope structure during the pre-impulsive stage of an eruptive M7.7 solar flare, with the Nobeyama Radioheliograph (NoRH) at 17 GHz. The flux rope is also observed by the SDO/AIA in its hot passbands of 94 and 131 Å\. In the microwave data, it is revealed as an overall arcade-like structure consisting of several intensity enhancements bridged by generally weak emissions, with brightness temperatures ($T_B$) varying from ~10,000~K to ~20,000 K. Locations of microwave intensity enhancements along the structure remain relatively fixed at certain specific parts of the flux rope, indicating that the distribution of emitting electrons is affected by the large scale magnetic configuration of the twisted flux rope. Wavelet analysis shows a pronounced 2-min period of the microwave $T_B$ variation during the pre-impulsive stage of interest. The period agrees well with that reported for AIA sunward-contracting loops and upward ejective plasmoids (suggested to be reconnection outflows). This suggests that both periodicities are controlled by the same reconnection process that takes place intermittently at a 2-min time scale. We infer that at least a part of the emission is excited by non-thermal energetic electrons via the gyro-synchrotron mechanism. The study demonstrates the potential of microwave imaging in exploring the flux rope magnetic geometry and relevant reconnection process during the onset of solar eruption.
description: This paper has been accepted by The Astrophysical Journal Letters
Electromagnetic radiation as a probe of the initial state and of viscous dynamics in relativistic nuclear collisions
Creators: name: Vujanovic, Gojko
name: Paquet, Jean-François
name: Denicol, Gabriel S.
name: Luzum, Matthew
name: Jeon, Sangyong
name: Gale, Charles
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The penetrating nature of electromagnetic signals makes them suitable probes to explore the properties of the strongly-interacting medium created in relativistic nuclear collisions. We examine the effects of the initial conditions and shear relaxation time on the spectra and flow coefficients of electromagnetic probes, using an event-by-event 3+1D viscous hydrodynamic simulation (MUSIC).
description: 14 pages, 14 figures; v2: minor improvements to text
Electroluminescence of Thin Film Solar Cells and PV Modules - Camera Calibration
Creators: name: Topic, M.
name: Raguse, J.
name: Zaunbrecher, K.
name: Bokalic, M.
name: Sites, J.R.
Publisher: name: WIP
Year: 2011
Subjects: Thin Film Solar Cells
CIS and Related Ternary and Quaternary Thin Film Solar Cells

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 2963-2966
description: Three different CCD cameras for electroluminesence (EL) have been calibrated by the same procedure
and there images mutually compared on the same thin-film CdTe solar cell and module samples, aiming to determine
the calibration and performance parameters. The cameras differ in CCD array resolution, temperature of operation,
range of programmable electronic exposure time that all affect a noise floor and quality of EL images. The calibration
procedure is explained and results of the analysis for all three cameras are given. Electroluminescent images taken by
all three cameras on the same PV device samples under the same excitation conditions have been recorded and are
mutually compared. Despite differences in calibration and performance, all cameras exhibit good quality for EL
imaging and in identifiying local defects in PV devices under test.
Testing modified gravity scenarios with direct peculiar velocities
Creators: name: Lyall, Stuart
name: Blake, Chris
name: Turner, Ryan
name: Ruggeri, Rossana
name: Winther, Hans
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The theoretical basis of dark energy remains unknown and could signify a need to modify the laws of gravity on cosmological scales. In this study we investigate how the clustering and motions of galaxies can be used as probes of modified gravity theories, using galaxy and direct peculiar velocity auto- and cross-correlation functions. We measure and fit these correlation functions in simulations of $Λ$CDM, DGP, and $f(R)$ cosmologies and, by extracting the characteristic parameters of each model, we show that these theories can be distinguished from General Relativity using these measurements. We present forecasts showing that with sufficiently large data samples, this analysis technique is a competitive probe that can help place limits on allowed deviations from GR. For example, a peculiar velocity survey reaching to $z=0.5$ with $20\%$ distance accuracy would constrain model parameters to 3-$σ$ confidence limits $\log_{10}|f_{R0}| < -6.45$ for $f(R)$ gravity and $r_c > 2.88 \, c/H_0$ for nDGP, assuming a fiducial GR model.
description: 14 pages, 12 figures, 3 tables, accepted for publication in MNRAS
Spatial Modeling of Thin-Film Modules Using SPICE
Creators: name: Pieters, B.E.
Publisher: name: WIP
Year: 2011
Subjects: Thin Film Solar Cells
CIS and Related Ternary and Quaternary Thin Film Solar Cells

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 2967-2970
description: A simulation tool is developed which implements the network simulation method (NSM) for the 2D
modeling of thin-film solar modules. The program uses a variable, adaptive mesh to allow for accurate simulations.
The results of this model will be compared to electroluminescence experiments on a Cu(In,Ga)Se2 solar module with
a defect (shunt). Furthermore, it is demonstrated that the program can handle complex shaped inhomogeneities such
as local variations in solar cell properties, illumination and contact layer resistance. The definition of complex shaped
inhomogeneities can also be used to model several monolithic series connected solar cells in a module.
Beyond the linear tide: impact of the non-linear tidal response of neutron stars on gravitational waveforms from binary inspirals
Creators: name: Yu, Hang
name: Weinberg, Nevin N.
name: Arras, Phil
name: Kwon, James
name: Venumadhav, Tejaswi
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Tidal interactions in coalescing binary neutron stars modify the dynamics of the inspiral and hence imprint a signature on their gravitational wave (GW) signals in the form of an extra phase shift. We need accurate models for the tidal phase shift in order to constrain the supranuclear equation of state from observations. In previous studies, GW waveform models were typically constructed by treating the tide as a linear response to a perturbing tidal field. In this work, we incorporate non-linear corrections due to hydrodynamic three- and four-mode interactions and show how they can improve the accuracy and explanatory power of waveform models. We set up and numerically solve the coupled differential equations for the orbit and the modes and analytically derive solutions of the system's equilibrium configuration. Our analytical solutions agree well with the numerical ones up to the merger and involve only algebraic relations, allowing for fast phase shift and waveform evaluations for different equations of state over a large parameter space. We find that, at Newtonian order, non-linear fluid effects can enhance the tidal phase shift by $\gtrsim 1\,{\rm radian}$ at a GW frequency of 1000 Hz, corresponding to a $10-20\%$ correction to the linear theory. The scale of the additional phase shift near the merger is consistent with the difference between numerical relativity and theoretical predictions that account only for the linear tide. Non-linear fluid effects are thus important when interpreting the results of numerical relativity and in the construction of waveform models for current and future GW detectors.
description: 20 pages, 9 figures. Accepted for publication in MNRAS
Synthesizing Probabilistic Invariants via Doob's Decomposition
Creators: name: Barthe, Gilles
name: Espitau, Thomas
name: Fioriti, Luis María Ferrer
name: Hsu, Justin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Programming Languages (cs.PL)
subject: Symbolic Computation (cs.SC)
subject: FOS: Computer and information sciences

description: When analyzing probabilistic computations, a powerful approach is to first find a martingale---an expression on the program variables whose expectation remains invariant---and then apply the optional stopping theorem in order to infer properties at termination time. One of the main challenges, then, is to systematically find martingales. We propose a novel procedure to synthesize martingale expressions from an arbitrary initial expression. Contrary to state-of-the-art approaches, we do not rely on constraint solving. Instead, we use a symbolic construction based on Doob's decomposition. This procedure can produce very complex martingales, expressed in terms of conditional expectations. We show how to automatically generate and simplify these martingales, as well as how to apply the optional stopping theorem to infer properties at termination time. This last step typically involves some simplification steps, and is usually done manually in current approaches. We implement our techniques in a prototype tool and demonstrate our process on several classical examples. Some of them go beyond the capability of current semi-automatic approaches.
Consistent Estimation for Partition-wise Regression and Classification Models
Creators: name: Cheung, Rex C. Y.
name: Aue, Alexander
name: Lee, Thomas C. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Partition-wise models offer a flexible approach for modeling complex and multidimensional data that are capable of producing interpretable results. They are based on partitioning the observed data into regions, each of which is modeled with a simple submodel. The success of this approach highly depends on the quality of the partition, as too large a region could lead to a non-simple submodel, while too small a region could inflate estimation variance. This paper proposes an automatic procedure for choosing the partition (i.e., the number of regions and the boundaries between regions) as well as the submodels for the regions. It is shown that, under the assumption of the existence of a true partition, the proposed partition estimator is statistically consistent. The methodology is demonstrated for both regression and classification problems.
description: 29 pages, 2 figures
Development and Understanding of the Intrinsic and Doped Amorphous Emitter-Layer Stacks for Silicon Heterojunction Solar Cells
Creators: name: Pysch, D.
name: Meinhardt, C.
name: Hermle, M.
name: Glunz, S.W.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 1820-1824
description: Comparison of the open-circuit voltage Voc determined by sunsVoc to the implied voltage Voc,impl
determined by transient QSSPC lifetime measurements can lead to a quick and easy analysis and characterization of
silicon heterojunction (SHJ) solar cells, especially in regard to finding the optimum doping concentration of the
emitter layer (stack system). The Voc,impl represents the interface passivation quality. The sunsVoc value gives us
additionally a measure of the apparent band-bending. Increasing the concentration of doping gases during the
deposition of e.g. a-Si:H(p) reduces the interface passivation quality (Voc,impl) and increases the band-bending
(sunsVoc value). The best trade off is realized when the ratio of sunsVoc to Voc,impl (Voc trade off ) first comes to a
saturation value near 1, while increasing the doping concentration. For a-Si:H(p) layers the pseudo fill factor PFF is
found to be dependent on the doping concentration, too. Thus, the maximum value obtained for the PFF sunsVoc
product is taken as a measure for the optimal doping concentration of a-Si:H(p) emitter layers. This approaches are
applied to answer the following questions: i) what is the optimum doping concentration for an a-Si:H(n) emitter layer
vs. an a-Si:H(i & n) emitter layer stack? ii) what is the best doping concentration of the a-Si:H(p) layer in an a-
Si:H(i & p) emitter layer stack system including a variation of the a-Si:H(i) as well as the a-Si:H(p) layer thickness?
Luminescence Imaging for Quantitative Solar Cell Material and Process Characterization
Creators: name: Glatthaar, M.
name: Haunschild, J.
name: Zeidler, R.
name: Rentsch, J.
name: Rein, S.
name: Breitenstein, O.
name: Hinken, D.
name: Bothe, K.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 1825-1827
description: Electro (EL) and photoluminescence (PL) imaging are rather new methods for fast spatially resolved
characterization of the electrical properties of crystalline silicon solar cells. EL imaging is experimentally quite
simple. Unfortunately in general a quantitative evaluation of the diode quality is not possible, but is limited to very
low quality devices. Conversely, PL imaging is experimentally more challenging but allows also a quantitative
evaluation of the diode quality for state-of-the-art devices. Experimentally the two techniques are compared
analyzing two differently processed solar cells made of multi crystalline sister wavers.
Deep Instance Segmentation and Visual Servoing to Play Jenga with a Cost-Effective Robotic System
Creators: name: Marchionna, Luca
name: Pugliese, Giulio
name: Martini, Mauro
name: Angarano, Simone
name: Salvetti, Francesco
name: Chiaberge, Marcello
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The game of Jenga represents an inspiring benchmark for developing innovative manipulation solutions for complex tasks. Indeed, it encouraged the study of novel robotics methods to successfully extract blocks from the tower. A Jenga game round undoubtedly embeds many traits of complex industrial or surgical manipulation tasks, requiring a multi-step strategy, the combination of visual and tactile data, and the highly precise motion of the robotic arm to perform a single block extraction. In this work, we propose a novel, cost-effective architecture for playing Jenga with e.Do, a 6-DOF anthropomorphic manipulator manufactured by Comau, a standard depth camera, and an inexpensive monodirectional force sensor. Our solution focuses on a visual-based control strategy to accurately align the end-effector with the desired block, enabling block extraction by pushing. To this aim, we train an instance segmentation deep learning model on a synthetic custom dataset to segment each piece of the Jenga tower, allowing visual tracking of the desired block's pose during the motion of the manipulator. We integrate the visual-based strategy with a 1D force sensor to detect whether the block can be safely removed by identifying a force threshold value. Our experimentation shows that our low-cost solution allows e.DO to precisely reach removable blocks and perform up to 14 consecutive extractions in a row.
Gettering of Metallurgical Grade Silicon by HCl Gas
Creators: name: Hampel, J.
name: Schmich, E.
name: Boldt, F.M.
name: Wiehl, N.
name: Hampel, G.
name: Kratz, J.V.
name: Reber, S.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Thin Film Crystalline Silicon Solar Cells and Wafer Equivalents

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2557-2559
description: In this thesis, hydrogen chloride (HCl) gas gettering of multicrystalline silicon for the use in
photovoltaics is investigated. The gettering effect is due to the removal of metallic impurities from the surface of the
wafers through the formation of volatile chloride compounds. This method is considered to be used as an effective
purification step in the solar cell process. It could be easily integrated into the concept of the crystalline silicon thin
film (cSiTF) solar cell. This concept combines two main aspects. On the one hand, it is cost saving because only a
small amount of expensive high purity silicon is needed for the epitaxial deposition of a thin layer on low-cost
silicon. On the other hand, the product which is called epitaxial wafer equivalent (EpiWE) can be further processed
in a standard wafer cell production. However, low-cost silicon which could be used as substrate has a high amount of
doping and metallic impurities which severely degrades the cell efficiency. Therefore, the amount of impurities in the
substrate has to be reduced in order to prevent diffusion into the active layer. An economical and effective
purification step is needed. HCl gas gettering shows the potential to achieve the required purity levels.
ConCVD and ProConCVD: Development of High-Throughput CVD Tools on the Way to Low-Cost Silicon Epitaxy
Creators: name: Reber, S.
name: Arnold, M.
name: Pocza, D.
name: Schillinger, N.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Thin Film Crystalline Silicon Solar Cells and Wafer Equivalents

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2560-2564
description: High throughput silicon deposition tools are imperative to enable the still outstanding step for crystalline
silicon thin-film concepts towards production. This paper reports the actual status of the effort at Fraunhofer ISE
undertaken to realize two such tools: the ConCVD and the ProConCVD. The ConCVD has undergone a major revision
and now features two consecutive deposition chambers for in-situ deposition of base and emitter. Its main purpose
is process development in small scale up to ~50 wafers/h. The ProConCVD is a massively scaled version of the
ConCVD, intended to prove the scalability of the approach to a near-production level of more than 1000 wafers/h.
This tool will be set up, as was the ConCVD, in the SIMTEC laboratory of Fraunhofer ISE. The predicted performance
of both tools was simulated extensively by numerical CFD and analytical methods. All simulations done so far
confirmed the predicted performance of both tools concerning deposition quality and reactor safety.
Comparative Solid-Phase Crystallisation of Si Thin-Films on Glass Deposited by Electron-Beam Evaporation and Plasma-Enhanced CVD
Creators: name: Tao, Y.
name: Varlamov, S.
name: Tsao, C.-Y.
name: Ouyang, Z.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Thin Film Crystalline Silicon Solar Cells and Wafer Equivalents

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2486-2489
description: Solid-phase crystallisation (SPC) of hydrogenated (H+) and dehydrogenated (H-) Si thin films on glass
deposited by electron-beam (e-beam) evaporation (EVA) and plasma-enhanced chemical vapor deposition (PECVD)
is compared. Four independent film characterisation methods, optical transmission microscopy (OTM), UV
reflectance spectroscopy (UV-R), X-ray diffraction (XRD) and Raman spectroscopy, reveal that for the SPC process
at 600ºC the evaporated films have similar incubation and nucleation times as the PECVD films but the number of
initial crystal grains is less and their growth rate is faster in the evaporated films. The scanning electron microscopy
(SEM) images of fully crystallised polycrystalline Si film (poly-Si) samples after Secco etching show that the
average grain size is larger in the evaporated film. The resulting quality of evaporated poly-Si appears to be at least
as good as the quality of poly-Si made by PECVD promising similar cell efficiencies. Hydrogen is not responsible
for the observed differences between SPC of the films from two different deposition methods.
Thermal photon production from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions
Creators: name: Ayala, Alejandro
name: Castano-Yepes, Jorge David
name: Dominguez, C. A.
name: Hernandez, L. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We compute the production of thermal photons in relativistic heavy-ion collisions by gluon fusion in the presence of an intense magnetic field, and during the early stages of the reaction. This photon yield is an excess over calculations that do not consider magnetic field effects. We add this excess to recent hydrodynamic calculations that are close to describing the experimental transverse momentum distribution in RHIC and LHC. We then show that with reasonable values for the temperature, magnetic field strength, and strong coupling constant, our results provide a very good description of such excess. These results support the idea that the origin of at least some of the photon excess observed in heavy-ion experiments may arise from magnetic field induced processes.
description: 4 pages 3 figures
A Novel Photovoltaic-Module Assembly System for Back Contact Solar Cells Using Laser Soldering Technique
Creators: name: Köntges, M.
name: Gast, M.
name: Brendel, R.
name: Meyer, R.
name: Giegerich, A.
name: Merz, P.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Components for PV Systems
PV Modules

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 2709-2712
description: We present a prototype of a new module assembly machine, which addresses five aspects of current fabrication
issues: (i) Increase of module production speed for (ii) cells with both contacts on the rear side, (iii) use of lead free solders,
(iv) reduction of cell handling and (v) applicability to thin solar cells. We name the prototype ATLAS. The ATLAS system
lays up back contact cells directly onto the module lamination foil and solders the interconnectors to the cells using a laser.
Our newly developed prototype system handles each cell only once. The problem of accumulation of particles in the
soldering station is avoided as each new lamination sheet serves as a clean substrate. The system is capable of assembling
back-contacted cells. Cell and cross connection is done in one machine. Our ATLAS prototype system solders a complete
connector bone between two solar cells in 5 s with one 200 W diode laser and one handling system. For a production system
the speed may easily be increased to 2 s per cell by using three diode lasers. Compared to a standard stringer, the ATLAS
system concept will double the productivity.
Firedec: a two-channel finite-resolution image deconvolution algorithm
Creators: name: Cantale, N.
name: Courbin, F.
name: Tewes, M.
name: Jablonka., P.
name: Meylan, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a two-channel deconvolution method that decomposes images into a parametric point-source channel and a pixelized extended-source channel. Based on the central idea of the deconvolution algorithm proposed by Magain, Courbin & Sohy (1998), the method aims at improving the resolution of the data rather than at completely removing the point spread function (PSF). Improvements over the original method include a better regularization of the pixel channel of the image, based on wavelet filtering and multiscale analysis, and a better controlled separation of the point source vs. the extended source. In addition, the method is able to simultaneously deconvolve many individual frames of the same object taken with different instruments under different PSF conditions. For this purpose, we introduce a general geometric transformation between individual images. This transformation allows the combination of the images without having to interpolate them. We illustrate the capability of our algorithm using real and simulated images with complex diffraction-limited PSF.
description: Accepted in A&A. An application of the technique to real data is available in Cantale et al. http://arxiv.org/abs/1601.05192v1
Progress on Ultra-High Efficiency, High-Concentration PV System Based on Spectral Division Between A GaInP/GaInAs/Ge and BPC Silicon Cells
Creators: name: Mohedano, R.
name: Buljan, M.
name: Benítez, P.
name: Miñano, J.C.
name: Sun, Y.
name: Falicoff, W.
name: Vilaplana, J.
name: Chaves, J.
name: Biot, G.
name: López, J.
Publisher: name: WIP
Year: 2011
Subjects: Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Terrestrial Concentrator Systems

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 129-132
description: A novel high concentration (>500×)/high efficiency concept is presented. It uses combines a
commercial concentration GaInP/GaInAs/Ge (3J) cell and a concentration Back-Point-Contact (BPC) silicon cell for
enhanced spectral utilization, and external confinement techniques to recover the light reflected at the 3J cell. The
primary optical element (POE) is a flat Fresnel lens and the secondary optical element (SOE) is a free-form RXI-type
concentrator with a band-pass filter embedded into it, with both optical parts performing Köhler integration to
produce light homogenization over the cells. The band-pass filter sends the IR photons in the 900-1200 nm band
(originally meant to feed the Ge bottom junction, which has an excess of current) to the silicon cell. Computer
simulations predict that four-terminal terminal designs could achieve ~46% added cell efficiencies using commercial
39% 3J and 26% Si cells. A first proof-of-concept receiver prototype has been manufactured using a simpler optical
architecture (with a lower concentration, ~100× and lower achievable efficiency), and experimental measurements
have shown up to 39.8% 4J receiver efficiency using a 36.9% 3J cell. The current efforts are focused on
demonstrating the full potential of the concept, by rising the concentration (to permit the cells work at their best) and
by enhancing the proof of concept receiver (particularly, the band-pass filter).
Probing the early chemical evolution of the Sculptor dSph with purely old stellar tracers
Creators: name: Martínez-Vázquez, C. E.
name: Monelli, M.
name: Gallart, C.
name: Bono, G.
name: Bernard, E. J.
name: Stetson, P. B.
name: Ferraro, I.
name: Walker, A. R.
name: Dall'Ora, M.
name: Fiorentino, G.
name: Iannicola, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the metallicity distribution of a sample of 471 RR Lyrae (RRL) stars in the Sculptor dSph, obtained from the $I$-band Period-Luminosity relation. It is the first time that the early chemical evolution of a dwarf galaxy is characterized in such a detailed and quantitative way, using photometric data alone. We find a broad metallicity distribution (FWHM=0.8 dex) that is peaked at [Fe/H]$\simeq$-1.90 dex, in excellent agreement with literature values obtained from spectroscopic data. Moreover, we are able to directly trace the metallicity gradient out to a radius of $\sim$55 arcmin. We find that in the outer regions (r$>\sim$32 arcmin) the slope of the metallicity gradient from the RRLs (-0.025 dex arcmin$^{-1}$) is comparable to the literature values based on red giant (RG) stars. However, in the central part of Sculptor we do not observe the latter gradients. This suggests that there is a more metal-rich and/or younger population in Sculptor that does not produce RRLs. This scenario is strengthened by the observation of a metal-rich peak in the metallicity distribution of RG stars by other authors, which is not present in the metallicity distribution of the RRLs within the same central area.
description: 5 pages, 4 figures. Accepted for publication on MNRAS Letters
Defects in Chalcopyrite Thin Film Solar Cells with Electroplated CuInSe2 Absorber
Creators: name: Riedel, I.
name: Werth, A.
name: Neerken, J.
name: Ohland, J.
name: Parisi, J.
name: Rechid, J.
Publisher: name: WIP
Year: 2011
Subjects: Thin Film Solar Cells
CIS and Related Ternary and Quaternary Thin Film Solar Cells

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 2904-2907
description: Due to the efficient usage of starting materials electrodeposition of chalcopyrite thin films is
considered to be a promising and cost-effective approach for the mass production of Cu(In,Ga)Se2 photovoltaic
devices. CuInSe2 solar cells with electrochemically processed metal precursor and subsequent annealing under
selenium excess atmosphere were processed on steel substrates with a chromium barrier coating and on titanium foils,
respectively. Both sample configurations exhibit a limitation of the open circuit voltage (VOC) being by ~80 mV
smaller than the champion values reported for neat CuInSe2. The VOC may be reduced by interface recombination at
ill-defined heterojunctions or by space-charge recombination via deep minority carrier traps located in the space
charge region. Such deep levels may be established by the creation of native defects or defect complexes during film
processing or by inclusion of extrinsic species, e.g., by diffusion of iron or other chemical species from the substrate
into the CuInSe2 layer. The aim of this study was to reveal the mechanism being responsible for the observed VOC
limitation. For this purpose we applied defect spectroscopy in combination with temperature and illumination
dependent current-voltage profiling.
Performances and robustness of quantum teleportation with identical particles
Creators: name: Marzolino, Ugo
name: Buchleitner, Andreas
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: When quantum teleportation is performed with truly identical massive particles, indistinguishability allows us to teleport addressable degrees of freedom which do not identify particles, but e.g. orthogonal modes. The key resource of the protocol is a state of entangled modes, but the conservation of the total number of particles does not allow for perfect deterministic teleportation unless the number of particles in the resource state goes to infinity. Here, we study the convergence of teleportation performances in the above limit, and provide sufficient conditions for asymptotic perfect teleporation. We also apply these conditions to the case of resource states affected by noise.
The SLUGGS Survey: The Assembly Histories of Individual Early-type Galaxies
Creators: name: Forbes, Duncan A.
name: Romanowsky, Aaron J.
name: Pastorello, Nicola
name: Foster, Caroline
name: Brodie, Jean P.
name: Strader, Jay
name: Usher, Christopher
name: Pota, Vincenzo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Early-type (E and S0) galaxies may have assembled via a variety of different evolutionary pathways. Here we investigate these pathways by comparing the stellar kinematic properties of 24 early-type galaxies from the SLUGGS survey with the hydrodynamical simulations of Naab et al. (2014). In particular, we use the kinematics of starlight up to 4 effective radii (R$_e$) as diagnostics of galaxy inner and outer regions, and assign each galaxy to one of six Naab et al. assembly classes. The majority of our galaxies (14/24) have kinematic characteristics that indicate an assembly history dominated by gradual gas dissipation and accretion of many gas-rich minor mergers. Three galaxies, all S0s, indicate that they have experienced gas-rich major mergers in their more recent past. One additional elliptical galaxy is tentatively associated with a gas-rich merger which results in a remnant galaxy with low angular momentum. Pathways dominated by gas-poor (major or minor) mergers dominate the mass growth of six galaxies. Most SLUGGS galaxies appear to have grown in mass (and size) via the accretion of stars and gas from minor mergers, with late major mergers playing a much smaller role. We find that the fraction of accreted stars correlates with the stellar mean age and metallicity gradient, but not with the slope of the total mass density profile. We briefly mention future observational and modelling approaches that will enhance our ability to accurately reconstruct the assembly histories of individual present day galaxies.
description: 17 pages, 10 figures, MNRAS in press