cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Suzaku view of Be/X-ray binary pulsar GX 304-1 during Type I X-ray outbursts
Creators: name: Jaisawal, Gaurava K.
name: Naik, Sachindra
name: Epili, Prahlad
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the timing and spectral properties of Be/X-ray binary pulsar GX 304-1 by using two Suzaku observations during its 2010 August and 2012 January X-ray outbursts. Pulsations at ~275 s were clearly detected in the light curves from both the observations. Pulse profiles were found to be strongly energy-dependent. During 2010 observation, prominent dips seen in soft X-ray ($\leq$10 keV) pulse profiles were found to be absent at higher energies. However, during 2012 observation, the pulse profiles were complex due to the presence of several dips. Significant changes in the shape of the pulse profiles were detected at high energies ($>$35 keV). A phase shift of $\sim$0.3 was detected while comparing the phase of main dip in pulse profiles below and above $\sim$35 keV. Broad-band energy spectrum of pulsar was well described by a partially absorbed Negative and Positive power-law with Exponential cutoff (NPEX) model with 6.4 keV iron line and a cyclotron absorption feature. Energy of cyclotron absorption line was found to be $\sim$53 and 50 keV for 2010 and 2012 observations, respectively, indicating a marginal positive dependence on source luminosity. Based on the results obtained from phase-resolved spectroscopy, the absorption dips in the pulse profiles can be interpreted as due to the presence of additional matter at same phases. Observed positive correlation between cyclotron line energy and luminosity, and significant pulse-phase variation of cyclotron parameters are discussed in the perspective of theoretical models on cyclotron absorption line in X-ray pulsars.
description: 13 pages, 8 figures; Accepted for publication in MNRAS
Spot IV Characterization – An Effective Tool for R&D and Quality Control in Manufacturing of Thin Film Si Solar Modules
Creators: name: Kovacsics, C.
name: Krafcsik, I.
name: Labadi, Z.
name: Ducso, C.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Thin Film Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 3145-3148
description: A portable system was developed for measuring I-V characteristics of small area (0.5-1cm2) thin film Si diodes
formed by wet chemical etching or laser ablation process at arbitrary coordinates of the large area solar panel. Mapping the
lateral distribution of P, Isc, Voc and FF provides detailed information and quick feedback for process development. The
different light sources integrated in the system reveal new information about the diode as a PV device and allows separated
characterisation of the first and second diodes of the double junction cells. The capacitances of the junctions are also probed
with quasi static capacitance method. The quasi static C-V characteristics of the junctions and the intrinsic layer thickness can
be derived from pairs of I-V curves as measured with slow and fast voltage ramps. Biasing the double junction diodes in
combination with illumination of different wavelengths, the measurement of capacitance curves and the calculation of i-layer
thicknesses of both pin diodes are feasible. The simple, quick sample preparation and the short, automatic measurement
sequences in combination with the automatic evaluation facilitate rapid feedback for PECVD process development and
troubleshooting of regular PV production.
Greedy algorithms for prediction
Creators: name: Sancetta, Alessio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: In many prediction problems, it is not uncommon that the number of variables used to construct a forecast is of the same order of magnitude as the sample size, if not larger. We then face the problem of constructing a prediction in the presence of potentially large estimation error. Control of the estimation error is either achieved by selecting variables or combining all the variables in some special way. This paper considers greedy algorithms to solve this problem. It is shown that the resulting estimators are consistent under weak conditions. In particular, the derived rates of convergence are either minimax or improve on the ones given in the literature allowing for dependence and unbounded regressors. Some versions of the algorithms provide fast solution to problems such as Lasso.
description: Published at http://dx.doi.org/10.3150/14-BEJ691 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Tapering the sky response for angular power spectrum estimation from low-frequency radio-interferometric data
Creators: name: Choudhuri, Samir
name: Bharadwaj, Somnath
name: Roy, Nirupam
name: Ghosh, Abhik
name: Ali, Sk. Saiyad
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: It is important to correctly subtract point sources from radio-interferometric data in order to measure the power spectrum of diffuse radiation like the Galactic synchrotron or the Epoch of Reionization 21-cm signal. It is computationally very expensive and challenging to image a very large area and accurately subtract all the point sources from the image. The problem is particularly severe at the sidelobes and the outer parts of the main lobe where the antenna response is highly frequency dependent and the calibration also differs from that of the phase center. Here we show that it is possible to overcome this problem by tapering the sky response. Using simulated 150 MHz observations, we demonstrate that it is possible to suppress the contribution due to point sources from the outer parts by using the Tapered Gridded Estimator to measure the angular power spectrum C_l of the sky signal. We also show from the simulation that this method can self-consistently compute the noise bias and accurately subtract it to provide an unbiased estimation of C_l.
description: 7 pages, 4 figures. Accepted for publication in MNRAS. The definitive version will be available at http://mnrasl.oxfordjournals.org/
18.9 %-Efficient Screen-Printed Solar Cells Applying a Print-on-Print Process
Creators: name: Hannebauer, H.
name: Falcon, T.
name: Hesse, R.
name: Dullweber, T.
name: Brendel, R.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1607-1610
description: We investigate different process conditions of the print-on-print Ag front side metallization such as Ag
pastes and screen aperture. The print-on-print process reduces the Ag finger width down to 70 m. The application of
the  optimized  print-on-print  process  to  industrial  type  large  area  screen-printed  solar  cells  displays  conversion
efficiencies up to 18.9 % compared to 18.5 % efficiency with standard single printed 107 m wide Ag fingers. The
efficiency improvement is caused by an improved short circuit current of up to 37.4 mA/cm2 which is explained by
the reduced shadowing loss. However, we find a strong dependence of the solar cell parameters on the print-on-print
process conditions.
Certificação CoreTrustSeal: a qualificação dos processos do DataRepositóriUM rumo a dados FAIR e a curadores de dados mais capacitados
Creators: name: Príncipe, Pedro
name: Vieira, André
name: Karimova, Yulia
name: Moura, Paula
Publisher: name: Zenodo
Year: 2023

description: Apresentação realizada na sessão "Pecha Kucha III" da 14ª Conferência Lusófona de Ciência Aberta, Natal Brasil, de 18 a 21 de setembro de 2023.
Schroedinger operators on exterior domains with Robin boundary conditions: heat kernel estimates
Creators: name: Kovarik, Hynek
name: Mugnolo, Delio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We study Schroedinger operators with Robin boundary conditions on exterior domains in $\R^d$. We prove sharp point-wise estimates for the associated semi-groups which show, in particular, how the boundary conditions affect the time decay of the heat kernel in dimensions one and two. Applications to spectral estimates are discussed as well.
Upaya Strategis Pemberantasan  Illegal Fishing di Indonesia: Suatu  Rekomendasi Kebijakan
Creators: name: Ardan, Mochammad Chaerul
Publisher: name: Zenodo
Year: 2023
Subjects: Illegal Fishing
Indonesia
Rekomendasi Kebijakan

description: Indonesia merupakan negara kepulauan terbesar di dunia dengan luas lautan yang mencapai dua pertiga dari keseleruhan wilayahnya. Fakta tersebut tentu tidak terlepas dari adanya potensi kelautan dan perikanan yang harus dikelola dan dilindungi dengan guna memberi dampak positif bagi masyarakat dan pembanguan ekonomi nasional tentunya. Namun, potensi yang ada juga tentu menjadi ancaman tersendiri bagi negara terkait dengan adanya praktek illegal fishing atau penangkapan ikan oleh pihak asing tanpa adanya izin dari negara terkait di wilayah perairan Indonesia. Untuk itu, ancaman terkait penangakapan ikan secara ilegal di wilayah perairan Indonesa ini kemudian perlu menjadi perhatian khusus pemerintah agar bisa segera diberantas sehingga potensi yang kelautan nasional yang ada bisa dimanfaatkan secara optimal. Maka dari itu, policy brief ini akan menjabarkan tiga opsi kebijakan yang dapat ditempuh oleh pemerintah khususnya Kementerian Kelautan dan Perikanan dalam rangka memberantas tindak penangkapan ikan secara illegal, yaitu: memperketat penjagaan di wilayah perbatasan yang rawan; menginisiasi pembentukan regulasi regional terkait penanggulangan illegal fishing; dan menambah sarana dan prasarana pengawasan di wilayah perairan. Tulisan ini kemudian akan merekomendasikan kebijakan mana yang dianggap paling strategis dan efektif dalam mengatasi permasalahan illegal fishing di Indonesia.
The complexity of cylindrical algebraic decomposition with respect to polynomial degree
Creators: name: England, Matthew
name: Davenport, James H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Symbolic Computation (cs.SC)
subject: FOS: Computer and information sciences
subject: I.1.2
subject: 68W30, 03C10

description: Cylindrical algebraic decomposition (CAD) is an important tool for working with polynomial systems, particularly quantifier elimination. However, it has complexity doubly exponential in the number of variables. The base algorithm can be improved by adapting to take advantage of any equational constraints (ECs): equations logically implied by the input. Intuitively, we expect the double exponent in the complexity to decrease by one for each EC. In ISSAC 2015 the present authors proved this for the factor in the complexity bound dependent on the number of polynomials in the input. However, the other term, that dependent on the degree of the input polynomials, remained unchanged. In the present paper the authors investigate how CAD in the presence of ECs could be further refined using the technology of Groebner Bases to move towards the intuitive bound for polynomial degree.
An Integrated Experimental-Numerical Study of the Performance of Lime-Based Mortars in Masonry Piers Under Eccentric Loading
Creators: name: Nežerka, Václav
name: Antoš, Jakub
name: Litoš, Jiří
name: Tesárek, Pavel
name: Zeman, Jan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Architectural conservation and repair are becoming increasingly important issues in many countries due to numerous prior improper interventions, including the use of inappropriate repair materials over time. As a result, the composition of repair masonry mortars is now being more frequently addressed in mortar research. Just recently, for example, it has become apparent that Portland cement mortars, extensively exploited as repair mortars over the past few decades, are not suitable for repair because of their chemical, physical, mechanical, and aesthetic incompatibilities with original materials. This paper focuses on the performance of various lime-based alternative materials intended for application in repairing historic structures when subjected to mechanical loading. Results of basic material tests indicate that the use of metakaolin as a pozzolanic additive produces mortars with superior strength and sufficiently low shrinkage. Moreover, mortar strength can be further enhanced by the addition of crushed brick fragments, which explains the longevity of Roman concretes rich in pozzolans and aggregates from crushed clay products such as tiles, pottery, or bricks. An integrated experimental-numerical approach was used to identify key mortar parameters influencing the load-bearing capacity of masonry piers subjected to a combination of compression and bending. The simulations indicate increased load-bearing capacities for masonry piers containing metakaolin-rich mortars with crushed brick fragments, as a result of their superior compressive strength.
description: 22 pages, 19 figures, 2 tables
Laser Ablation: Towards Advanced Industrial Solar Cell Metallization Processes
Creators: name: Das, J.
name: Tous, L.
name: Hernández, J.L.
name: Jaffrennou, P.
name: Ngamo, M.
name: John, J.
name: Posthuma, N.E.
name: Baert, K.
name: Poortmans, J.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1691-1693
description: For high efficiency industrial silicon solar cells, Cu based contacts are very promising, in order to
reduce shadow losses, series resistance losses, and to improve the contact resistance to the emitter. In this perspective
laser ablation is a fast and cost-effective technique to open the SiNx anti-reflection-coating (ARC). In this paper we
study the laser ablation damage to the emitter by SEM and optical microscopy, and SunsVoc characterization. Finally
we compare the solar cells performance of Ti/Cu contacting schemes using (1) line contact ablation (2) point contact
ablation with a reference process (3) where wet etching is used to structure the SiNx ARC layer.
A systematic study of the initial state in heavy ion collisions based on the quark participant assumption
Creators: name: Zheng, Liang
name: Yin, Zhongbao
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We investigate the initial state geometric quantities of heavy ion collisions based on the quark participant assumption in the Glauber multiple scattering approach. A systematic comparison to the nucleon participant assumption has been presented and confronted with the charged multiplicity measurements in various collision systems. It is found that the quark participant based assumption can be important to understand the data in multiplicity production and the initial spatial eccentricity in small systems.
description: 7 pages, 10 figures
Perspectives and Challenge of BIPV Product Design
Creators: name: Hagemann, I.B.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
PV and Architecture

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4016-4022
description: To utilize PV on buildings describes a win-win situation for both the PV industry as well as the
construction industry. The building sector needs BIPV to meet its goals of sustainability and the PV industry is
looking forward to utilize the available building surface areas for PV to secure its long term market growth. However,
compared to the planning and installation of a standard roof top mounted PV system, truly integrated BIPV is far
more complex and challenging to put into practice. Experts from both PV and building industry need to get involved
for collaborating on the planning and execution of it. Structural and design aspects as well as non-technical and
economical market conditions need to be understood and taken into account for its successful development. This
paper provides some enlightenment on this. It describes both, particularities of the construction sector compared to
the PV sector, and ongoing substantial changes, in the way how buildings are designed and built, with regard to their
impact on BIPV product development. This might allow a more realistic assessment of the expectations linked to
BIPV. The paper also formulates objectives for fruitful BIPV product design and development.
Emission redistribution from a quantum dot-bowtie nanoantenna
Creators: name: Regler, A.
name: Schraml, K.
name: Lyamkina, A.
name: Spiegl, M.
name: Müller, K.
name: Vuckovic, J.
name: Finley, J. J.
name: Kaniber, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a combined experimental and simulation study of a single self-assembled InGaAs quantum dot coupled to a nearby ($\sim 25nm$) plasmonic antenna. Micro-photoluminescence spectroscopy shows a $\sim 2.4\times$ increase of intensity, which is attributed to spatial far-field redistribution of the emission from the quantum dot-antenna system. Power-dependent studies show similar saturation powers of $2.5μW$ for both coupled and uncoupled quantum dot emission in polarization-resolved measurements. Moreover, time-resolved spectroscopy reveals the absence of Purcell-enhancement of the quantum dot coupled to the antenna as compared to an uncoupled dot, yielding comparable exciton lifetimes of $τ\sim0.5ns$. This observation is supported by numerical simulations, suggesting only minor Purcell-effects of $<2\times$ for emitter-antenna separations $>25nm$. The observed increased emission from a coupled quantum dot-plasmonic antenna system is found to be in good qualitative agreement with numerical simulations and will lead to a better understanding of light-matter-coupling in such novel semiconductor-plasmonic hybrid systems
Results of Module Testing in Enertis Solar during the Quality Control of 19 MW and 13 MW PV Power Plants in Spain
Creators: name: Coello, J.
name: Carreño, R.
name: Carames, M.
name: Galindo, J.L.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
PV Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3494-3497
description: This paper aims to show the results of PV modules quality control executed in two large PV plants
located in the south of Spain during modules supply. Quality control was carried out in Enertis Solar Laboratory for
PV module characterization and it consists in four tests: visual inspections, peak power measurement, electrical
isolation and thermographic inspection. Results show defective modules have been detected in all analyzed
manufacturers, so quality control of PV modules is necessary to reduce technical and financial risks. Also, examples
of detected defects during tests are showed.
Data literacy - The key to a broad adaptation of Open Science and the FAIR principles
Creators: name: Förstner, Konrad
Publisher: name: Zenodo
Year: 2022
Subjects: Open Science
FAIR
FAIR Principles
The Carpentries
Date Literarcy

description: This are the slides of a keynote presentation as part of CarpentryCon 2022. Abstract: In all research domains the ongoing digital transformation is currently changing how science is conducted. Rapidly growing quantities of data as well as metadata are produced, processed, analyzed and archived. Besides this, further research results including software and models are published and shared. The broad recognition and adaptation of Open Science as well as the FAIR Principles (Findable, Accessible, Interoperable, Reusable) lead to more transparency, reproducibility and reuse of such items. On the other hand, this also generates new requirements regarding skills to handle these items adequately. This makes data literacy with all its diverse facets a key skill for basically every researcher and people supporting research activities like data steward. Since their beginning the three lesson programs of "The Carpentries" (Software Carpentry, Data Carpentry and Library Carpentry) have been working on developing training material, teaching methods, but most importantly on building a community for bringing these skill to the people. In this talk we will shed light on the ongoing implementation of Open Science and the FAIR principles in different disciplines and present opportunities as well as challenges. Furthermore, we will discuss how "The Carpentries" help different scientific communities to acquire needed data literacy skills to improve the quality of their research.
Positive Effective Temperature Coefficient of Power of +0.75%/°C in Flexible a-Si Modules in Building Integrated Installations
Creators: name: Fischer, D.
name: Bichsel, F.
name: De Brujin, S.
name: Goulpie, P.
name: Sansonnens, L.
name: Ziegler, Y.
name: Closset, A.
name: Jankovec, M.
name: Kurnik, J.
name: Topic, M.
name: Fanni, L.
name: Pola, I.
name: Nagel, K.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
PV Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3505-3508
description: The paper analyses and discusses the effect of temperature on the performance ratio of Flexcell’s a-Si
based PV modules and plants. As a first finding, a relatively high annual cycle amplitude of 20% of performance is
found for central European locations. Secondly, annealing experiments in the lab of light-soaked modules yield an
activated annealing behavior, and stressing the importance of peak cell temperature, and with significant annealing
rates at temperatures as low as 60°C.
As a next step, the performance rate during outdoor exposure is correlated with the daily peak module temperatures
reached by the exposed modules. Here, a unique linear relation is found to relate these two parameters, defining an
“effective” positive temperature coefficient with a magnitude about +0.75%/°C. Further, back side isolation is found
to clearly improve the performance ratio and thus the energy yield of exposed modules significantly through the
increase of the daily peak module temperature; the improvement is of 8%; the corresponding increase of 12°C in the
daily peak module temperature is thereby corroborating the amplitude of the effective temperature coefficient. In
addition, the linear peak module temperature dependency of the performance ratio is further confirmed by a first data
from a larger grid connected flat roof plant that has started to operate in January 09 in southern Switzerland.
New insights into the quasi-periodic X-ray burster GS 0836-429
Creators: name: Aranzana, E.
name: Sánchez-Fernández, C.
name: Kuulkers, E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: GS 0836-429 is a neutron star X-ray transient that displays Type-I X-ray bursts. In 2003 and 2004 it experienced two outbursts in X-rays. We present here an analysis of the system bursting properties during these outbursts. We studied the evolution of the 2003-2004 outbursts in soft X-rays using RXTE (2.5-12 keV; ASM), and in hard X-rays with INTEGRAL (17-80 keV, IBIS/ISGRI). Using data from the JEM-X monitor onboard INTEGRAL we detected 61 Type-I X-ray bursts, and confirm that the source displayed a quasi-periodic burst recurrence time of about 2.3 hours. We improve the characterization of the fuel composition, as well as the description of the typical burst durations and fluences. We estimate the average value of $α$ to be $49\pm\,3$. This value together with the observed burst profiles indicate a regime of a mixed He/H runaway triggered by unstable helium ignition. In addition, we report the detection of four series of double bursts, with burst recurrence times of $\leq\,20$ minutes. The measured recurrence time in double bursts is too short to allow the accretion of enough fresh material, necessary to trigger a Type-I X-ray burst. This suggests the presence of left-over, unburned material from the preceding burst which gets ignited in a time scale of minutes. The energies and time scales of the secondary bursts suggest a lower fraction of hydrogen compared to that estimated for the primary bursts. The persistent emission was roughly constant during the period when the Type I X-ray bursts were detected. We derive an average accretion rate during our observations of $\dot{m}\sim\,8\,\%\,\dot{m}_{Edd}$. The spectrum of the persistent emission can be fit with a non-thermal component, indicative for the source to be in a hard state when the INTEGRAL observations were performed.
description: Accepted for publication in A&A, 11 pages
Green 5G Heterogeneous Networks through Dynamic Small-Cell Operation
Creators: name: Cai, Shijie
name: Che, Yueling
name: Duan, Lingjie
name: Wang, Jing
name: Zhou, Shidong
name: Zhang, Rui
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Traditional macro-cell networks are experiencing an upsurge of data traffic, and small-cells are deployed to help offload the traffic from macro-cells. Given the massive deployment of small-cells in a macro-cell, the aggregate power consumption of small-cells (though being low individually) can be larger than that of the macro-cell. Compared to the macro-cell base station (MBS) whose power consumption increases significantly with its traffic load, the power consumption of a small-cell base station (SBS) is relatively flat and independent of its load. To reduce the total power consumption of the heterogeneous networks (HetNets), we dynamically change the operating states (on and off) of the SBSs, while keeping the MBS on to avoid any service failure outside active small-cells. First, we consider that the wireless users are uniformly distributed in the network, and propose an optimal location-based operation scheme by gradually turning off the SBSs closer to the MBS. We then extend the operation problem to a more general case where users are non-uniformly distributed in the network. Although this problem is NP-hard, we propose a joint location and user density based operation scheme to achieve near-optimum (with less than 1\% performance loss in our simulations) in polynomial time.
description: The longer version of a paper to appear in IEEE Journal on Selected Areas in Communications, green communications and networking series
Exchangeable exogenous shock models
Creators: name: Mai, Jan-Frederik
name: Schenk, Steffen
name: Scherer, Matthias
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We characterize a comprehensive family of $d$-variate exogenous shock models. Analytically, we consider a family of multivariate distribution functions that arises from ordering, idiosyncratically distorting, and finally multiplying the arguments. Necessary and sufficient conditions on the involved distortions to yield a multivariate distribution function are given. Probabilistically, the attainable set of distribution functions corresponds to a large class of exchangeable exogenous shock models. Besides, the vector of exceedance times of an increasing additive stochastic process across independent exponential trigger variables is shown to constitute an interesting subclass of the considered distributions and yields a second probabilistic model. The alternative construction is illustrated in terms of two examples.
description: Published at http://dx.doi.org/10.3150/14-BEJ693 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Antiferromagnetic spin chain behavior and a transition to 3D magnetic order in Cu(D,L-alanine)2: Roles of H-bonds
Creators: name: Calvo, Rafael
name: Sartoris, Rosana P.
name: Calvo, Hernan L.
name: Chagas, Edson F.
name: Rapp, Raul E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the spin chain behavior, a transition to 3D magnetic order and the magnitudes of the exchange interactions for the metal-amino acid complex Cu(D,L-alanine)2.H2O, a model compound to investigate exchange couplings supported by chemical paths characteristic of biomolecules. Thermal and magnetic data were obtained as a function of temperature (T) and magnetic field (B0). The magnetic contribution to the specific heat, measured between 0.48 and 30 K, displays above 1.8 K a 1D spin-chain behavior that can be fitted with an intrachain antiferromagnetic (AFM) exchange coupling constant 2J0 = (-2.12 $\pm$ 0.08) cm$^{-1}$, between neighbor coppers at 4.49 Å along chains connected by non-covalent and H-bonds. We also observe a narrow specific heat peak at 0.89 K indicating a phase transition to a 3D magnetically ordered phase. Magnetization curves at fixed T = 2, 4 and 7 K with B0 between 0 and 9 T, and at T between 2 and 300 K with several fixed values of B0 were globally fitted by an intrachain AFM exchange coupling constant 2J0 = (-2.27 $\pm$ 0.02) cm$^{-1}$ and g = 2.091 $\pm$ 0.005. Interchain interactions J1 between coppers in neighbor chains connected through long chemical paths with total length of 9.51 Å are estimated within the range 0.1 < |2J1| < 0.4 cm$^{-1}$, covering the predictions of various approximations. We analyze the magnitudes of 2J0 and 2J1 in terms of the structure of the corresponding chemical paths. The main contribution in supporting the intrachain interaction is assigned to H-bonds while the interchain interactions are supported by paths containing H-bonds and carboxylate bridges, with the role of the H-bonds being predominant. We compare the obtained intrachain coupling with studies of compounds showing similar behavior and discuss the validity of the approximations allowing to calculate the interchain interactions.
description: 10 pages, 4 figures
Core-level spectra from bilayer graphene
Creators: name: Sernelius, Bo E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We derive core-level spectra for doped free-standing bilayer graphene. Numerical results are presented for all nine combinations of the doping concentrations $10^{12}\rm{cm}^{-2}$, $10^{13}\rm{cm}^{-2}$, and $10^{14}\rm{cm}^{-2}$ in the two graphene sheets and we compare the results to the reference spectra for monolayer graphene. We furthermore discuss the spectrum of single-particle inter-band and intra-band excitations in the $ωq$-plane, and show how the dispersion curves of the collective modes are modified in the bilayer system.
description: 6 pages, 6 figures
Mechanical Challenge of Frameless Large-Sized Thin-Film PV-Modules
Creators: name: Weller, B.
name: Tautenhahn, L.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
PV Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3509-3512
description: Fundamental to the mounting of frameless photovoltaic (PV) modules is the knowledge of behaviour
of various factors. A balanced system results in the ability for large load levels to be handled maybe with large
deformations but without cracking in individual glass components.
The Institute of Building Construction has utilized numerical simulation to become familiar with various types of
parameters and their level of influence induced by different PV-systems. Input parameters for these simulations have
been determined by systematic mechanical tests conducted at the institute’s Friedrich-Siemens-laboratory. These
results and the experience gained from these tests were used in the development of new, alternative reinforcing
mechanisms. Prototypes employing these new techniques have been developed and are currently being tested to
determine their potential use and efficiency.
The institute’s state-of-the-art pneumatic testing apparatus, specifically designed for load tests of PV-modules,
enables the monitoring of static or dynamic mechanical loading of PV-systems, all subjected to consistent load
conditions and for instance ensuring compliance with IEC 61646. The flexibility inherent within this apparatus
allows for the unlimited programming of realistic simulation scenarios for testing. The data obtained from such tests
can subsequently be evaluated and compared or used to validate the numerical simulation results.
Surface Passivation for Industrial Solar Cells
Creators: name: Vanormelingen, K.
name: Vermont, P.
name: Granneman, E.H.A.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1682-1685
description: The goal of this work is to investigate the performance of industrial type PERC cells using an Al2O3
rear surface passivation layer. The Al2O3 layers were deposited using the Levitrack system, using the concept of
spatial ALD combined with contactless wafer transport to deposit Al2O3 layers with a throughput up to 3600
wafers/hr. The obtained lifetimes strongly depend on the Al2O3 film thickness and show a maximum at values below
10nm. This position of this maximum is strongly correlated to the formation of blister on the surface due to hydrogen
outgassing. Applying these dielectric passivation layers in a PERC cell results in a significant increase in Isc of almost
5% for an 11.6nm thick layer and 2.6% for a 5.6nm layer as compared to the reference. A comparison of different
pre-Al2O3 deposition cleaning methods shows that best results are obtained on a native oxide surface.
Building Skin as Electricity Source: The Prototype of a Wooden BIPV Façade Component
Creators: name: Maturi, L.
name: Lollini, R.
name: Baldracchi, P.
name: Sparber, W.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
PV and Architecture

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3991-3999
description: The building envelope could be conceived not only as a passive solution, but also as an active system able to
contribute to satisfy electricity demand if a PV system is integrated in it.
Anyway, costs represent still a barrier for the use of PV as a common building material [1].
The prefabrication of an envelope component that integrates PV system could reduce the costs and, at the
same time, enhance the overall quality and the energy performance.
In this context a concept of an innovative prefabricated wooden façade component with integrated PV, has
been conceived and developed. It is a multifunctional component constituted by three main layers: a structural
part of framed wood panel with thermal insulation, an air gap for the natural ventilation and the PV system.
The optimization of its energy performance was the objective of this research activity, which considered both
the PV production and the impact of the component on the building energy balance.
The methodology used to optimize the configuration of the prototype was a parametric analysis considering
the following parameters as independent variables: the PV technology, the ventilation as well as the thickness of
the air gap, the heat exchange features and the materials applied.
The analysis considered as dependent variables the PV efficiency, i.e. the module’s temperature, which was
evaluated through thermal energy simulations and the value of the thermal transmittance, which was assessed
both through calculation and experimental campaign.
The component prototype was tested in a calorimeter, part of Eurac indoor test facilities, to measure its
steady-state thermal transmission properties.
Then it will be installed in a prototypical building for an elementary school, which is entirely realized with
prefabricated wood framed panels. This will allow to monitor the energy performance of the prototype working
under real conditions and also to monitor its energy impact on the building fabric, providing a deeper
understanding on the energy interaction between integrated PV and the building envelope.
In Situ Monitoring of Degradation Processes Inside PV Modules of Different Technologies
Creators: name: Merten, J.
name: Sicot, L.
name: Delesse, Y.
name: Martin, J.-L.
name: Mezzasalma, F.
name: Guérin De Montgareuil, A.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
PV Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3490-3493
description: The lifetime energy production of photovoltaic modules depends on their aging behaviour. Aim of the
subproject 5 of the EU-PERFORMANCE project is the identification and modelling of long term aging
mechanisms. For this purpose, eight different PV module technologies are exposed outdoor at the Solar
Outdoor Measurement Platform in Cadarache (South of France).
The problem is to clearly identify and determine aging effects. Due to the absence of reference cells for
thin film technologies, aging of module power is hard to identify. Furthermore, fill factor or efficiency data mix
up different aging processes going on in the module. However, module developers do need to know which
aging processes limit the lifetime and the performance of the modules.
It is therefore proposed to perform measurements which directly access the parameters of the equivalent
circuit, and to monitor in-situ the aging of each parameter. This paper demonstrates how this can be done with
Variable Illumination Measurements (VIM). The VIM-method is a simple tool revealing rich information
about PV modules. This allowed for a clear separation of the aging of five technological key issues determining
the performance of the modules: the rectifying capacity, the second diode, the recombination in the i-layer for
amorphous silicon modules, the series and parallel resistances.
The Hotspot Approach. CONDISOBS Policy Paper No. 1
Creators: name: Lorenzo, Vianelli
Publisher: name: Zenodo
Year: 2022
Subjects: Asylum
Migration
Borders
European Union
Hotspot Approach

description: This policy paper is based on the findings of the H2020 project CONDISOBS, which was conducted by Lorenzo Vianelli at the University of Luxembourg, thanks to funding received from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 838722. CONDISOBS explored the governance of the mobility of asylum seekers in the European Union through a multi-sited qualitative study based on in-depth semi-structured interviews with state officials, representatives of international organisations and non-governmental organisations, lawyers, members of advocacy groups, social workers and activists. Interview material was integrated by an extensive review of academic literature, policy documents and institutional and non-governmental reports. Data was collected between October 2020 and June 2021. This policy paper is part of a series on the hotspot approach, which also includes a policy paper on the implementation of the approach in Greece and another one on its implementation in Italy. All policy papers, as well as other research outputs, are freely accessible on the project website.
First Three Years of Operation of an Amorphous Silicon Thin-Film BIPV-System from Ersol Thin-Film (Bosch Solar)
Creators: name: Feitknecht, L.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
PV and Architecture

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4011-4015
description: The present paper gives insight into the application of thin-film silicon modules in the example of an
alpine roof-integrated 1.5 kWP PV-system connected to the electrical grid. Instead of expensive instrumented
laboratory measurements, the data of relatively low-cost standard measurement equipment is interpretation here. The
yearly specific yield reaches in average 1065 kWh/kWPeak and a PR of 87% after three years. These measured values
are compared with the simulated output values of a PV-simulation program. The summer half-year contributes 79%
to the overall yield, the simulation predicts 15% too low the summer yield. The electrical power output in winter is
quite low, essentially due to the snow coverage on the modules. Explanations for the inaccuracies of the output
prediction of the PV-simulation software are evaluated. Consequences for the architecture of Building Integrated
Photovoltaic (BIPV) in climatic regions with snow are discussed.
Verification of an analytic fit for the vortex core profile in superfluid Fermi gases
Creators: name: Verhelst, Nick
name: Klimin, Sergei
name: Tempere, Jacques
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: A characteristic property of superfluidity and -conductivity is the presence of quantized vortices in rotating systems. To study the BEC-BCS crossover the two most common methods are the Bogoliubov-De Gennes theory and the usage of an effective field theory. In order to simplify the calculations for one vortex, it is often assumed that the hyperbolic tangent yields a good approximation for the vortex structure. The combination of a variational vortex structure, together with cylindrical symmetry yields analytic (or numerically simple) expressions. The focus of this article is to investigate to what extent this analytic fit truly reflects the vortex structure throughout the BEC-BCS crossover at finite temperatures. The vortex structure will be determined using the effective field theory presented in [Eur. Phys. Journal B 88, 122 (2015)] and compared to the variational analytic solution. By doing this it is possible to see where these two structures agree, and where they differ. This comparison results in a range of applicability where the hyperbolic tangent will be a good fit for the vortex structure.
description: 14 pages, 7 figures
A New Tool for the MotherPV Method: Modeling of the Irradiance Coefficient of Photovoltaic Modules
Creators: name: Guérin De Montgareuil, A.
name: Sicot, L.
name: Martin, J.-L.
name: Mezzasalma, F.
name: Delesse, Y.
name: Merten, J.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Components for PV Systems
PV Modules

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 3305-3309
description: INES/CEA has developed an accurate method, the MotherPV method, for the prediction of the
performance of modules for any well known climate. The MotherPV method uses a short campaign of measurements
in outdoor conditions to determine 2 module coefficients. The irradiance coefficient at 25 °C expresses the non
proportionality of the power of a module as a function of its short circuit current. The irradiance coefficient value at
Standard Test Conditions is 1 and is different from 1 at other irradiance levels (the temperature coefficient,
depending on the irradiance level, expresses the linearity of the power as a function of the module temperature, at a
given irradiance level). In the literature, several models exist to express the irradiance coefficient as a function of the
irradiance. The present work compares the accuracy of the different existing models and of a new INES/CEA model,
for six module technologies characterised at INES/CEA with the MotherPV method. For crystalline silicon modules,
existing models give an excellent representation of the irradiance coefficient The new model gives the best accuracy
for all the modules (better than 1% at a 95% confidence level), especially for thin film modules. This new model can
be used in the MotherPV method or in any existing method to predict or monitor very accurately the energy
production of photovoltaic modules and systems
IMass Balance of Silicon Etching in HF-HNO3 Mixtures: The Formation of Hydrogen and Nitrous Gases
Creators: name: Acker, J.
name: Steinert, M.
name: Hoffmann, V.
name: Schramm, N.
name: Suckow, M.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1662-1665
description: The present work deals with the quantification of reactions products formed in the etching of silicon using HF/HNO3
mixtures. It turned out, that in HF-rich etchants two parallel pathways contribute to the oxidation of silicon: (i) via the
oxidation by HNO3 and reactive intermediates generated by the reduction of HNO3, and (ii) via the formation of
hydrogen. Furthermore we found, that the consumption of HNO3, i.e. expressed by the molar amount of HNO3 to
dissolve 1 mol Si, is affected by several parameters, like the HF/HNO3 mixing ratio, the etch temperature, and the
type of wafers used in etching. The higher the consumption of HNO3 the poorer is its utilization. This leads to an
enrichment of reactive intermediates in the etch mixture and/or to a higher formation of nitrous oxides. The results
emphasize the importance for an efficient control of the etch conditions, e.g. temperature, etch bath composition, etch
bath lifetime, and defined replenishment cycles as key parameters for a more effective utilization of nitric acid and
for a minimization of the costs for chemicals, waste, and exhaust gas treatment.
Etch Kinetic and Morphological Investigations on the Horizontal Etching Process
Creators: name: Meinel, B.
name: Koschwitz, T.
name: Heinemann, R.
name: Acker, J.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1671-1673
description: Wet chemical etching of mc silicon wafer is an object of investigations to clarify the procedures in the
acidic solution and their influence on the texturisation of the wafer surface. New insights may help to improve
horizontal etch lines for the solar industry.
The horizontal etching process is been less investigated compared to the vertical process. SEM micrographs reveal
different structures on both sides of the textured wafer. For the first time we were able to examine the etching rates
for the upper and bottom side during the texturisation separately. We present a model to explain the structural
differences which occur on both sides and document the process with SEM pictures. The development of the etching
rate during the etching process is observed with increasing time steps over a time of 100 seconds. We found a
significant lower etching rate during the first fifty seconds on the lower side of the wafer compared to the upper side.
After the sawing damage is removed the etching rates on both sides adjust to each other. Furthermore we examined
the influence of the temperature as well as stirring rates on the structural building process for the upper and bottom
side of the wafer. Additionally kinetic experiments allowed us to determine the activation energy for both sides as
well. A comparison to literature data confirms the supposed diffusion controlled mechanism of the etch reaction.