cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Finite Spaces and Schemes
Creators: name: de Salas, Fernando Sancho
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: A ringed finite space is a ringed space whose underlying topological space is finite. The category of ringed finite spaces contains, fully faithfully, the category of finite topological spaces and the category of affine schemes. Any ringed space, endowed with a finite open covering, produces a ringed finite space. We introduce the notions of schematic finite space and schematic morphism, showing that they behave, with respect to quasi-coherence, like schemes and morphisms of schemes do. Finally, we construct a fully faithful and essentially surjective functor from a localization of a full subcategory of the category of schematic finite spaces and schematic morphisms to the category of quasi-compact and quasi-separated schemes.
description: This is a simplified version of the paper Ringed Finite Spaces, arXiv:1409.4574v2
Overcoming Over-Plating Problems on Acid Textured Multicrystalline Wafers with Silicon Nitride Coated Surfaces
Creators: name: Wang, S.
name: Puzzer, T.
name: Vogl, B.
name: Tjahjono, B.
name: Hallam, B.
name: Eadie, M.
name: Borojevic, N.
name: Hameiri, Z.
name: Wenham, S.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 1449-1452
description: Effective self-aligned electroless plating metallisation schemes have been well known and quantified
for many decades. The electroless plating technique works well in conjunction with several selective emitter
technologies on monocrystalline wafers such as laser doped, buried contact and inkjet printed design features to
achieve low contact resistance of the final device. However, applying the electroless plating technique on standard
acid textured multicrystalline wafers with a silicon nitride coated surface can be relatively challenging. There are two
main causes of over-plating on acid textured multi-crystalline wafers with silicon nitride coated surfaces: the nature
of PECVD SiNx deposition itself and the topology of wafer surfaces. In addition to increased shading losses, overplating
can cause shunting mechanisms or form Schottky contacts. Consequently, the overall performance of the
solar cell is reduced. In this work, the origins of over-plating problems are examined and several solutions are
evalutated. Finally, multicrystalline wafers without excess plating on the surface are demonstrated.
Low Temperature Pads on Al-Emitter or Al-BSF
Creators: name: Halm, A.
name: Popescu, L.M.
name: Theobald, J.
name: Peter, K.
name: Kopecek, R.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 1462-1464
description: Screen printed Si solar cells are commonly interconnected in modules with straps soldered to their
busbars on the front and the AgAl pads on their back. We present a new method for applying AgAl pads on fully
covered Al backsides. This method is of great interest because it can be used to apply AgAl pads on screen printed Al
rear side emitters of n-type p+nn+ Si solar cells. That makes their industrial production feasible. The method
developed here can also be implemented to increase the open circuit voltage of an n+pp+ standard industrial cell due
to a fully covering Al-BSF on the rear side.
title: Ο αναπαραγωγικός τουρισμός στην Ελλάδα
title: Reproductive tourism in Greece
titleType: AlternativeTitle
Creators: name: Καραγιαννάκη, Μαρία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Υπογονιμότητα
subject: Ιατρικός τουρισμός
subject: Εξωσωματική γονιμοποίηση

description: Η έντονη επιθυμία για την απόκτηση παιδιών και τα προβλήματα υπογονιμότητας, είναι ζητήματα που απασχολούσαν πάντα την ανθρωπότητα και έχει αναφερθεί τόσο σε θρησκευτικές περιγραφές όσο και στην λογοτεχνία και την τέχνη. Η υπογονιμότητα είναι μια πολυπαραγοντική κατάσταση και μπορεί να οφείλεται σε γενετικούς, παθολογικούς, ανατομικούς ή οργανικούς παράγοντες. Ο τομέας της εξωσωματικής γονιμοποίησης έχει επιτύχει αλματώδη ανάπτυξη από την άποψη της ιατρικής επιστήμης και αναπτύσσεται συνεχώς και ραγδαία με νέες μεθόδους υποβοηθούμενης αναπαραγωγής, προκειμένου να καλύψει τις ολοένα και αυξανόμενες ανάγκες των ζευγαριών που αντιμετωπίζουν προβλήματα υπογονιμότητας. Από απόψεως ιατρικού τουρισμού είναι ένας πολλά υποσχόμενος κλάδος με πολύ καλές προοπτικές ανάπτυξης. Ο ιατρικός τουρισμός, είναι ένας πολύ σημαντικός κλάδος της τουριστικής βιομηχανίας σε παγκόσμιο και εθνικό επίπεδο. Ο ιατρικός τουρισμός είναι ουσιαστικά η οποιαδήποτε μορφή ταξιδιού από τον τόπο διαμονής σε άλλες χώρες με σκοπό την αποκατάσταση της υγείας τους ασθενούς χρησιμοποιώντας τις ιατρικές υπηρεσίες που προσφέρει ο κάθε προορισμός. Τα κριτήρια που καθορίζουν τις χώρες ως προορισμούς ιατρικού τουρισμού ποικίλλουν, ανάλογα με το είδος των υπηρεσιών που προσφέρουν, με τα κόστη , το νομοθετικό πλαίσιο, την ποιότητα των υπηρεσιών και τη θρησκεία της εκάστοτε χώρας. Η παρούσα πτυχιακή προσπαθεί να διερευνήσει και να αναλύσει τη σπουδαιότητα της ανάπτυξης του αναπαραγωγικού τουρισμού στην Ελλάδα, καθώς και τα μέτρα που πρέπει να ληφθούν για την ανάπτυξη συνεργασίας μεταξύ των μονάδων υποβοηθούμενης αναπαραγωγής και του τουριστικού τομέα, προκειμένου να αυξηθεί η εισροή των του ιατρικών τουριστών στην Ελλάδα και να εδραιωθεί η Ελλάδα ως ένας δημοφιλής προορισμός αναπαραγωγικού τουρισμού. Για την ανάλυση του αναπαραγωγικού τουρισμού στην Ελλάδα έχουν ληφθεί υπόψιν η ποιότητα των υπηρεσιών που προσφέρονται, τα κόστη, το θεσμικό πλαίσιο, οι κοινωνικοοικονομικοί παράμετροι, οι θρησκευτικές αντιλήψεις καθώς και τα αίτια αναζήτησης συγκεκριμένου τουριστικού ιατρικού προορισμού, και πιο συγκεκριμένα στον τομέα υποβοηθούμενης αναπαραγωγής.
Weak Mixing Angle Measurement with COHERENT and APV
Creators: name: Cadeddu, Matteo
Publisher: name: Zenodo
Year: 2019
Subjects: neutrinos
CEvNS
weak mixing angle
atomic parity violation

description: Presentation at the 2019 Magnificent CEvNS workshop on the subject of weak mixing angle determinations based on COHERENT data in concert with atomic parity violation data.
Molecular gas and star formation in the Tidal Dwarf Galaxy VCC 2062
Creators: name: Lisenfeld, U.
name: Braine, J.
name: Duc, P. A.
name: Boquien, M.
name: Brinks, E.
name: Bournaud, F.
name: Lelli, F.
name: Charmandaris, V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The physical mechanisms driving star formation (SF) in galaxies are still not fully understood. Tidal dwarf galaxies (TDGs), made of gas ejected during galaxy interactions, seem to be devoid of dark matter and have a near-solar metallicity. The latter makes it possible to study molecular gas and its link to SF using standard tracers (CO, dust) in a peculiar environment. We present a detailed study of a nearby TDG in the Virgo Cluster, VCC 2062, using new high-resolution CO(1--0) data from the Plateau de Bure, deep optical imaging from the Next Generation Virgo Cluster Survey (NGVS), and complementary multiwavelength data. Until now, there was some doubt whether VCC 2062 was a true TDG, but the new deep optical images from the NGVS reveal a stellar bridge between VCC 2062 and its parent galaxy, NGC 4694, which is clear proof of its tidal origin. Several high-resolution tracers (\halpha, UV, 8~\mi, and 24~\mi) of the star formation rate (SFR) are compared to the molecular gas distribution as traced by the CO(1-0). Coupled with the SFR tracers, the NGVS data are used with the CIGALE code to model the stellar populations throughout VCC 2062, yielding a declining SFR in the recent past, consistent with the low \halpha/UV ratio, and a high burst strength. HI emission covers VCC 2062, whereas the CO is concentrated near the HI maxima. The CO peaks correspond to two very distinct regions: one with moderate SF to the NE and one with only slightly weaker CO emission but with nearly no SF. Even where SF is clearly present, the SFR is below the value expected from the surface density of the molecular and the total gas as compared to spiral galaxies and other TDGs. After discussing different possible explanations, we conclude that the low surface brightness is a crucial parameter to understand the low SFR.
description: accepted by A&A
Magnetic fields of young solar twins
Creators: name: Rosén, L.
name: Kochukhov, O.
name: Hackman, T.
name: Lehtinen, J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The goal of this work is to study the magnetic fields of six young solar-analogue stars both individually, and collectively, to search for possible magnetic field trends with age. If such trends are found, they can be used to understand magnetism in the context of stellar evolution of solar-like stars and, the past of the Sun and the solar system. This is also important for the atmospheric evolution of the inner planets, Earth in particular. We used Stokes IV data from two different spectropolarimeters, NARVAL and HARPSpol. The least-squares deconvolution multi-line technique was used to increase the signal-to-noise ratio of the data. We then applied a modern Zeeman-Doppler imaging code in order to reconstruct the magnetic topology of all stars and the brightness distribution of one of our studied stars. Our results show a significant decrease in the magnetic field strength and energy as the stellar age increases from 100Myr to 250Myr while there is no significant age dependence of the mean magnetic field strength for stars with ages 250-650Myr. The spread in the mean field strength between different stars is comparable to the scatter between different observations of individual stars. The meridional field component has the weakest strength compared to the radial and azimuthal field components in 15 out of the 16 magnetic maps. It turns out that 89-97% of the magnetic field energy is contained in l=1-3. There is also no clear trend with age and distribution of field energy into poloidal/toroidal and axisymmetric/non-axisymmetric components within the sample. The two oldest stars in this study do show a twice as strong octupole component compared to the quadrupole component. This is only seen in one out of 13 maps of the younger stars. One star, chi1 Ori displays two field polarity switches during almost 5 years of observations suggesting a magnetic cycle length of either 2, 6 or 8 years.
description: 25 pages, 15 figures, 4 tables; Accepted for publication in Astronomy & Astrophysics
The 3D structure of the Galactic bulge
Creators: name: Zoccali, M.
name: Valenti, E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We review the observational evidences concerning the three-dimensional structure of the Galactic bulge. Although the inner few kpc of our Galaxy are normally referred to as {\it the bulge}, all the observations demonstrate that this region is dominated by a bar, i.e., the bulge is a bar. The bar has a boxy/peanut (X\--shaped) structure in its outer regions, while it seems to become less and less elongated in its innermost region. A thinner and longer structure departing from the main bar has also been found, although the observational evidences that support the scenario of two separate structures has been recently challenged. Metal poor stars ([Fe/H]$\lesssim -0.5$ dex) trace a different structure, and also have different kinematics.
description: 12 pages, 5 figures, accepted for publication on PASA
Quasiparticle interference of the Fermi arcs and surface-bulk connectivity of a Weyl semimetal
Creators: name: Inoue, Hiroyuki
name: Gyenis, Andras
name: Wang, Zhijun
name: Li, Jian
name: Oh, Seong Woo
name: Jiang, Shan
name: Ni, Ni
name: Bernevig, B. Andrei
name: Yazdani, Ali
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Weyl semimetals host topologically protected surface states, with arced Fermi surface contours that are predicted to propagate through the bulk when their momentum matches that of the surface projections of the bulk's Weyl nodes. We use spectroscopic mapping with a scanning tunneling microscope to visualize quasi-particle scattering and interference at the surface of the Weyl semimetal TaAs. Our measurements reveal 10 different scattering wave vectors, which can be understood and precisely reproduced with a theory that takes into account the shape, spin texture, and momentum-dependent propagation of the Fermi arc surface states into the bulk. Our findings provide evidence that Weyl nodes act as sinks for electron transport on the surface of these materials.
description: published in Science on March 11th
A study of excess energy and decoherence factor of a qubit coupled to a one dimensional periodically driven spin chain
Creators: name: Nag, Tanay
Publisher: name: arXiv
Year: 2015
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We take a central spin model (CSM), consisting of a one dimensional environmental Ising spin chain and a single qubit connected globally to all the spins of the environment, to study numerically the excess energy (EE) of the environment and the logarithm of decoherence factor namely, dynamical fidelity susceptibility per site (DFSS), associated with the qubit under a periodic driving of the transverse field term of environment across its critical point using the Floquet technique. The coupling to the qubit, prepared in a pure state, with the transverse field of the spin chain yields two sets of EE corresponding to the two species of Floquet operators. In the limit of weak coupling, we derive an approximated expression of DFSS after an infinite number of driving period which can successfully estimate the low and intermediate frequency behavior of numerically obtained DFSS. Our main focus is to analytically investigate the effect of system-environment coupling strength on the EEs and DFSS and relate the behavior of DFSS to EEs as a function of frequency by plausible analytical arguments. We explicitly show that the low-frequency beating like pattern of DFSS is an outcome of two frequencies, causing the oscillations in the two branches of EEs, that are dependent on the coupling strength. In the intermediate frequency regime, dip structure observed in DFSS can be justified by the resonance peaks of EEs at those coupling parameter dependent frequencies; high frequency saturation value of EEs and DFSS are also connected to each other by the coupling strength.
description: 12 pages, 10 figures
Monolithic Series Interconnection for Thin-Film Silicon Solar Cells on Steel Foil
Creators: name: Löffler, J.
name: Finck, C.
name: Wutz, M.
name: De Keijzer, M.A.
name: Dissel, M.
name: Heijna, M.
name: Späth, M.
name: Soppe, W.J.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Thin Films
Amorphous and Microcrystalline Silicon

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 2285-2288
description: Roll-to-roll production facilitates flexible PV modules and a significant decrease of production costs for thin-film
silicon solar cells. However, no standard processes for monolithic series interconnection on foil substrates are readily
available. ECN is currently developing the technology and setting up a pilot line for the production of single junction
and tandem solar cells based on microcrystalline and amorphous silicon on steel foil substrates. To allow monolithic
series interconnection on these electrically conducting substrates, an insulating layer is required. In the presented
module concept, first all layers of the solar cell are deposited, and after that series interconnection is realized by three
depth selective laser scribes which are filled by insulating and electrically conductive inks.
In this paper, we present the current status of development for all key technologies required for the presented module
concept: comprising a pinhole free insulating layer, an embossing process for this layer to apply light trapping
textures on sub-micrometer scale, depth selective laser scribing by solid state YAG lasers, and screen printing pastes
and processes for insulating and conductive inks curable at low temperature. First test samples have demonstrated the
feasibility of the depth selective laser scribing and electrical series interconnection with the developed screen printing
processes. Interconnection losses below 10% with respect to individual cells are anticipated when combining the
presented processes for actual fabrication of monolithically interconnected thin-film silicon solar cells on steel foil.
Product returns, policy for online purchases and the effect on customer satisfaction and loyalty
Creators: name: Νάσος, Σταμάτης Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2024
Subjects: επιστροφή προϊόντων
πολιτική επιστροφής
ικανοποίηση πελατών
return process
return policy
customer satisfaction

description: The objective of this study is to delve into the perceptions and attitudes of various demographic groups (including gender, age, and education level) regarding the product return process. To achieve this goal, the researchers conducted a comprehensive review of academic papers published within the last three years, focusing on themes related to customer loyalty, satisfaction, product returns, and return policies. Building upon the insights garnered from this literature review, the research team designed and administered an online questionnaire to collect data on how different demographic segments perceive the return process and its relationship with customer satisfaction and loyalty.
description: Ο στόχος αυτής της μελέτης είναι να εξετάσει τις αντιλήψεις και τις στάσεις διαφόρων δημογραφικών ομάδων (συμπεριλαμβανομένου φύλου, ηλικίας και επιπέδου εκπαίδευσης) σχετικά με τη διαδικασία επιστροφής προϊόντων. Για να επιτευχθεί αυτός ο στόχος, οι ερευνητές πραγματοποίησαν μια σφαιρική ανασκόπηση ακαδημαϊκών εργασιών που δημοσιεύτηκαν τα τελευταία τρία χρόνια, επικεντρώνοντας σε θέματα που σχετίζονται με την πιστότητα των πελατών, την ικανοποίηση, τις επιστροφές προϊόντων και τις πολιτικές επιστροφής. Με βάση τις ενδείξεις που προέκυψαν από αυτήν την ανασκόπηση της βιβλιογραφίας, η ομάδα έρευνας σχεδίασε και διενήργησε ένα διαδικτυακό ερωτηματολόγιο για να συλλέξει δεδομένα σχετικά με το πώς διαφορετικά δημογραφικά τμήματα αντιλαμβάνονται τη διαδικασία επιστροφής και τη σχέση της με την ικανοποίηση και την πιστότητα των πελατών.
Parallel Power Decoupling for Single-Phase PV-Inverters - Making Film Capacitors Applicable
Creators: name: Schimpf, F.
name: Norum, L.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Components for PV Systems
Balance of System Components

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 4434-4437
description: Electrolytic capacitors are a bottleneck for inverter lifetime. Because of the large capacitances used in
PV-inverters, a direct replacement by film-capacitors is not feasible for most topologies. This paper presents an
active circuit which acts as an interface between the DC-link of a PV-inverter and an additional storage capacitor. By
allowing a large voltage ripple at the storage capacitor, the installed capacitance can be used much more efficiently.
The proposed method is especially interesting for single-phase single-stage inverters, because here the voltage ripple
at the DC-link has to be kept small in order to achieve a good adaption to the maximum power point of the PV-generator.
A Novel Method of Optimization at a Constant Desposition Rate: Application to Thin-Film Amorphous Silicon Solar Cells
Creators: name: Hrunski, D.
name: Rech, B.
name: Repmann, T.
name: Kirchhoff, J.
name: Gordijn, A.
name: Hüpkes, J.
name: Appenzeller, W.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Thin Films
Amorphous and Microcrystalline Silicon

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 2292-2296
description: To reduce the production cost for thin-film amorphous silicon solar cells, a high deposition rate must be achieved without a decline in the cell efficiency. Over the last few decades, evidence was collected on the deposition rate (Rd) as an additional technological parameter: Y. Hishikawa et al. have demonstrated that when substrate temperature (Ts) is fixed, amorphous silicon material properties appear to depend only on Rd, regardless of the gas pressure, rf power, or reactor dimensions. High-efficiency amorphous single-junction solar cells deposited at a higher deposition rate with no further frequency increases is a goal of the present work. To find a technological optimum, the compared cells should have the same deposition rate and thickness. The novel optimization method of a constant deposition rate (CDR) is proposed. This method means that two technological parameters could be varied during optimization in order to keep the deposition rate constant. Here, the discharge power as the second technological parameter was changed in order to ensure a constant deposition rate. When CDR is applied for two different deposition pressures areas (“low-pressure regime” is 0.5 Torr and “high-pressure regime” is 8 Torr), it allows evidence to be obtained which clearly indicates that solar cells of an almost similar quality could be achieved under rather different technological conditions. Based on this fact, an updated view is presented of the role of silane concentration in plasma as a technological parameter. High initial efficiencies of 10.4 % are achieved by CDR for 1 cm2 amorphous silicon single-junction p-i-n solar cells deposited on Asahi-U-type TCO at a deposition rate of 5 Å/s (i-layer). The optimized solar cells show a stabilized efficiency of 8 %.
Influence of Carbon Content on the Crystallisation Process of Silicon-Carbon Alloy Films
Creators: name: Ambrosone, G.
name: Basa, D.K.
name: Coscia, U.
name: Rava, P.
name: Tucci, M.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Thin Films
Amorphous and Microcrystalline Silicon

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 2305-2308
description: Hydrogenated microcrystalline silicon carbon alloy films deposited at low substrate temperature is a
promising material for solar cells and opto-electronic device applications. The influence of carbon content on the
crystallization process has been investigated for the hydrogenated microcrystalline silicon carbon alloy films
prepared by plasma enhanced chemical vapour deposition (PECVD) technique using silane methane gas mixture
highly diluted in hydrogen as well as for the excimer laser annealed hydrogenated amorphous silicon carbon alloy
films deposited by PECVD from silane methane gas mixture diluted by helium. The study has demonstrated clearly
that the increase in the carbon content prevents the crystallisation process in the hydrogen diluted samples while the
crystallisation process is enhanced in the laser annealing of amorphous samples because of the increase in the
absorbed laser energy density that occurs for the amorphous films with increasing carbon content. This, in turn,
facilitates the crystallization for the laser annealed samples with higher carbon content, resulting in the formation of
SiC crystallites along with Si crystallites.
Optical Emission Line Nebulae in Galaxy Cluster Cores 1: The Morphological, Kinematic and Spectral Properties of the Sample
Creators: name: Hamer, S. L.
name: Edge, A. C.
name: Swinbank, A. M.
name: Wilman, R. J.
name: Combes, F.
name: Salomé, P.
name: Fabian, A. C.
name: Crawford, C. S.
name: Russell, H. R.
name: Hlavacek-Larrondo, J.
name: McNamara, B.
name: Bremer, M. N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present an Integral Field Unit survey of 73 galaxy clusters and groups with the VIsible Multi Object Spectrograph (VIMOS) on VLT. We exploit the data to determine the H$α$ gas dynamics on kpc-scales to study the feedback processes occurring within the dense cluster cores. We determine the kinematic state of the ionised gas and show that the majority of systems ($\sim$ 2/3) have relatively ordered velocity fields on kpc scales that are similar to the kinematics of rotating discs and are decoupled from the stellar kinematics of the Brightest Cluster Galaxy. The majority of the H$α$ flux ($>$ 50%) is typically associated with these ordered kinematics and most systems show relatively simple morphologies suggesting they have not been disturbed by a recent merger or interaction. Approximately 20% of the sample (13/73) have disturbed morphologies which can typically be attributed to AGN activity disrupting the gas. Only one system shows any evidence of an interaction with another cluster member. A spectral analysis of the gas suggests that the ionisation of the gas within cluster cores is dominated by non stellar processes, possibly originating from the intracluster medium itself.
description: 36 pages, 25 figures. Appendices available at http://aramis.obspm.fr/~hamer/igigcc/ionised_gas_in_cluster_cores_appendices.pdf (75 pages, supplementary figures and data tables)
The Influence of the SnO2 Substrate on the TiO2 and WO3 Photoelectric Properties
Creators: name: Enesca, A.
name: Isac, L.
name: Duta, A.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Advanced Photovoltaics: New Concepts and Ultra-high Efficiency
Fundamental Studies

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 595-598
description: The paper is focused on the “wafer” layer synthesis using spray pyrolysis deposition (SPD). Three
type of metal oxide layers (SnO2, TiO2 and WO3) were deposed in double and triple structures. The crystalline
structure (XRD), morphology (AFM) and surface energy (contact angle) analysis were investigated and correlated
with the optical and opto-electrical properties of the layers. The sample containing SnO2 as bottom layer and TiO2 as
top layer present photo-current response (IPCE = 1.79%) under light irradiation.
QoS Constrained Power Minimization in the MISO Broadcast Channel with Imperfect CSI
Creators: name: González-Coma, José P.
name: Joham, Michael
name: Castro, Paula M.
name: Castedo, Luis
Publisher: name: arXiv
Year: 2015
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider the design of linear precoders and receivers in a Multiple-Input Single-Output (MISO) Broadcast Channel (BC). We aim at minimizing the transmit power while fullfiling a set of per-user Quality-of-Service (QoS) constraints expressed in terms of per-user average rate requirements. The Channel State Information (CSI) is assumed to be perfectly known at the receivers but only partially at the transmitter. To solve the problem we transform the QoS constraints into Minimum Mean Square Error (MMSE) constraints. We then leverage the MSE duality between the BC and the Multiple Access Channel (MAC), as well as standard interference functions in the dual MAC, to perform power minimization by means of an Alternating Optimization (AO) algorithm. Problem feasibility is also studied to determine whether the QoS constraints can be fulfilled or not. Finally, we present an algorithm to balance the average rates and manage situations that may be unfeasible or lead to an unacceptably high transmit power.
AC susceptibility as a tool to probe the dipolar interaction in magnetic nanoparticles
Creators: name: Landi, Gabriel T
name: Arantes, Fabiana R
name: Cornejo, Daniel R.
name: Bakuzis, Andris F.
name: Andreu, Irene
name: Natividad, Eva
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The dipolar interaction is known to substantially affect the properties of magnetic nanoparticles. This is particularly important when the particles are kept in a fluid suspension or packed inside nano-carriers. In addition to its usual long-range nature, in these cases the dipolar interaction may also induce the formation of clusters of particles, thereby strongly modifying their magnetic anisotropies. In this paper we show how AC susceptibility may be used to obtain important information regarding the influence of the dipolar interaction in a sample. We develop a model which includes both aspects of the dipolar interaction and may be fitted directly to the susceptibility data. The usual long-range nature of the interaction is implemented using a mean-field solution, whereas the particle-particle aggregation is modeled using a distribution of anisotropy constants. The model is then applied to two samples studied at different concentrations. One consists of spherical magnetite nanoparticles dispersed in oil and the other of cubic magnetite nanoparticles embedded on PLGA nanospheres. We also introduce a simple technique to access the importance of the dipolar interaction in a given sample, based on the height of the AC susceptibility peaks for different driving frequencies. Our results help illustrate the important effect that the dipolar interaction has in most nanoparticle samples.
UVES and X-Shooter spectroscopy of the emission line AM CVn systems GP Com and V396 Hya
Creators: name: Kupfer, T.
name: Steeghs, D.
name: Groot, P. J.
name: Marsh, T. R.
name: Nelemans, G.
name: Roelofs, G. H. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present time-resolved spectroscopy of the AM CVn-type binaries GP Com and V396 Hya obtained with VLT/X-Shooter and VLT/UVES. We fully resolve the narrow central components of the dominant helium lines and determine radial velocity semi-amplitudes of $K_{\rm spike} = 11.7\pm0.3$ km s$^{-1}$ for GP Com and $K_{\rm spike} = 5.8\pm0.3$ km s$^{-1}$ for V396 Hya. The mean velocities of the narrow central components show variations from line to line. Compared to calculated line profiles that include Stark broadening we are able to explain the displacements, and the appearance of forbidden helium lines, by additional Stark broadening of emission in a helium plasma with an electron density $n_e\simeq 5\times 10^{15}$ cm$^{-3}$. More than $30$ nitrogen and more than $10$ neon lines emission lines were detected in both systems. Additionally, $20$ nitrogen absorption lines are only seen in GP Com. The radial velocity variations of these lines show the same phase and velocity amplitude as the central helium emission components. The small semi-amplitude of the central helium emission component, the consistency of phase and amplitude with the absorption components in GP Com as well as the measured Stark effect shows that the central helium emission component, the so-called central-spike, is consistent with an origin on the accreting white dwarf. We use the dynamics of the bright spot and the central spike to constrain the binary parameters for both systems and find a donor mass of $9.6$ - $42.8$ M$_{\rm Jupiter}$ for GP Com and $6.1$ - $30.5$ M$_{\rm Jupiter}$ for V396 Hya. We find an upper limit for the rotational velocity of the accretor of $v_{\rm rot}<46$ km s$^{-1}$ for GP Com and $v_{\rm rot}<59$ km s$^{-1}$ for V396 Hya which excludes a fast rotating accretor in both systems.
description: Accepted for publication in MNRAS, 15 pages, 14 figures, 5 tables
TISH IMPLANTLARI BO'YICHA  DAVOLASHNI REJALASHTIRISH BOSQICHLARIDA KAPPALARDAN FOYDALANISH
Creators: name: Rahimberdiyev Rustam  Axrorova Malika Shavkatovna  1st year Clinical Resident: O'skinova Nazira Department of Pediatric Dentistry  Samarkand State Medical University
Publisher: name: Zenodo
Year: 2025

description: Tish qatorlaridagi nuqsonlar va deformatsiyalar bilan bemorlarga  immediatsiya-protezlar tayyorlash  zamonaviy ortopedik stomatologiyaning dolzarb muammolaridan biridir.  Rejalashtirilgan implantlar sohasida suyak plastikasini amalga oshirish, nuqsonlarni to'liq osteointegratsiyaga erishguncha qiyinlashtirishi yoki umuman amalga oshirishga imkon bermasligi mumkin. Zamonaviy texnologiyalar va materiallar estetik jihatdan muhim zonalarda nuqsonlarni tezda almashtirish ko'rsatmalarini sezilarli darajada kengaytirmoqda.

Kalit so'zlar: kappa, protezlash, implantatsiya, immediat-protez
Experimental Results of a New MPPT Method Considering Local Maximun Power Points in a PV System
Creators: name: Vidaurrazaga, I.
name: Román Medina, E.
name: Alonso, R.
name: Moneo, R.
name: Ibáñez, P.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Components for PV Systems
Balance of System Components

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 4429-4433
description: In a real PV system, with various PV modules connected in series, some modules might be working
under different conditions, hence the output characteristic of each panel might not be equal. Under this situation, the
P-V curve of a PV array can show more than one Maximum Power Point (MPP) being only one of them optimum.
Traditional Maximum Power Point Tracking (MPPT) methods do not take into account this phenomenon, therefore,
the system might be working at a non-optimum point, not taking advantage of all the available power. This paper
presents an MPPT algorithm which deals with that circumstance in order to ensure that it finds the optimum point in
any case. Experimental results of the proposed algorithm are included.
Impact of Jet Veto Resummation on Slepton Searches
Creators: name: Tackmann, Frank J.
name: Waalewijn, Wouter J.
name: Zeune, Lisa
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Several searches for new physics at the LHC require a fixed number of signal jets, vetoing events with additional jets from QCD radiation. As the probed scale of new physics gets much larger than the jet-veto scale, such jet vetoes strongly impact the QCD perturbative series, causing nontrivial theoretical uncertainties. We consider slepton pair production with 0 signal jets, for which we perform the resummation of jet-veto logarithms and study its impact. Currently, the experimental exclusion limits take the jet-veto cut into account by extrapolating to the inclusive cross section using parton shower Monte Carlos. Our results indicate that the associated theoretical uncertainties can be large, and when taken into account have a sizeable impact already on present exclusion limits. This is improved by performing the resummation to higher order, which allows us to obtain accurate predictions even for high slepton masses. For the interpretation of the experimental results to benefit from improved theory predictions, it would be useful for the experimental analyses to also provide limits on the unfolded visible 0-jet cross section.
description: 29 pages, 11 figures
Crystalline Silicon Thin-Film Cells With Heterojunction Emitter
Creators: name: Auer, R.
name: Gawehns, N.
name: Kunz, T.
name: Winkelmann, H.
name: Fahrner, W.R.
Publisher: name: WIP-Munich
Year: 2008
Subjects: Thin Films
Thin Film Crystalline Silicon

description: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 2271-2274
description: Heterojunctions are a promising possibility to substitute the phosphorous diffusion for emitter formation
during solar cell fabrication. Especially for thin-film solar cells based on crystalline silicon films heterojunctions offer the
possibility of substitute high temperature diffusion for low temperature processes with n-type a-Si or i-n type a-Si for new
cell structures. Hence, impurity diffusion from the substrate will be eliminated. In this work we present first results on
heterojunction solar cells based on silicon (10-20 μm-thick) on a foreign carrier substrate. Different types of heterojunction
emitters were applied on recrystallized and non-recrystallized silicon films. Crystalline silicon thin-film solar cells on a
foreign substrate were fabricated using an i-a-Si/n-a-Si heterojunction instead of a diffused phosphorus emitter. The
heterojunction was adopted to the rough 10 μm-thin absorber layer with different grain sizes and grain heights. The
fabrication of the thin heterojunction structures reduces the thermal budget (max. temperature < 300°C) of the fabrication
process and has positive effects on the impurity diffusion from the substrate. We measured the electrical and optical
characteristics (current-voltage curve, EQE) of the heterojunction cells and compared them with cells using a diffused
phosphorus emitter by rapid thermal processing (RTP). The structures with heterojunction resulted in first solar cells with
6.2% efficiency and an increased open circuit voltage (+14 mV) compared to the reference cells.
Demonstration of a self-pulsing photonic crystal Fano laser
Creators: name: Yu, Yi
name: Xue, Weiqi
name: Semenova, Elizaveta
name: Yvind, Kresten
name: Mork, Jesper
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Semiconductor lasers in use today rely on mirrors based on the reflection at a cleaved facet or Bragg reflection from a periodic stack of layers. Here, we demonstrate an ultra-small laser with a mirror based on the Fano resonance between a continuum of waveguide modes and the discrete resonance of a nanocavity. The Fano resonance leads to unique laser characteristics. Since the Fano mirror is very narrow-band compared to conventional lasers, the laser is single-mode and in particular, it can be modulated via the mirror. We show, experimentally and theoretically, that nonlinearities in the mirror may even promote the generation of a self-sustained train of pulses at gigahertz frequencies, an effect that was previously only observed in macroscopic lasers. Such a source is of interest for a number of applications within integrated photonics.
Hexagonal boron nitride is an indirect bandgap semiconductor
Creators: name: Cassabois, G.
name: Valvin, P.
name: Gil, B.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Hexagonal boron nitride is a wide bandgap semiconductor with a very high thermal and chemical stability often used in devices operating under extreme conditions. The growth of high-purity crystals has recently revealed the potential of this material for deep ultraviolet emission, with an intense emission around 215 nm. In the last few years, hexagonal boron nitride has been raising even more attention with the emergence of two-dimensional atomic crystals and Van der Waals heterostructures, initiated with the discovery of graphene. Despite this growing interest and a seemingly simple structure, the basic questions of the bandgap nature and value are still controversial. Here, we resolve this long-debated issue by bringing the evidence for an indirect bandgap at 5.955 eV by means of optical spectroscopy. We demonstrate the existence of phonon-assisted optical transitions, and we measure an exciton binding energy of about 130 meV by two-photon spectroscopy.
description: To appear in Nature Photonics
How periodic driving heats a disordered quantum spin chain
Creators: name: Rehn, Jorge
name: Lazarides, Achilleas
name: Pollmann, Frank
name: Moessner, Roderich
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the energy absorption in real time of a disordered quantum spin chain subjected to coherent monochromatic periodic driving. We determine characteristic fingerprints of the well-known ergodic (Floquet-ETH for slow driving/weak disorder) and many-body localized (Floquet-MBL for fast driving/strong disorder) phases. In addition, we identify an intermediate regime, where the energy density of the system -- unlike the entanglement entropy a local and bounded observable -- grows logarithmically slowly over a very large time window.
Contactless Remote Induction of Shear Waves in Soft Tissues Using a Transcranial Magnetic Stimulation Device
Creators: name: Grasland-Mongrain, Pol
name: Miller-Jolicoeur, Erika
name: Tang, An
name: Catheline, Stefan
name: Cloutier, Guy
Publisher: name: arXiv
Year: 2016
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: This study presents the first observation of shear wave induced remotely within soft tissues. It was performed through the combination of a transcranial magnetic stimulation device and a permanent magnet. A physical model based on Maxwell and Navier equations was developed. Experiments were performed on a cryogel phantom and a chicken breast sample. Using an ultrafast ultrasound scanner, shear waves of respective amplitude of 5 and 0.5 micrometers were observed. Experimental and numerical results were in good agreement. This study constitutes the framework of an alternative shear wave elastography method.
Nanoscale spin rectifiers controlled by the Stark effect
Creators: name: Rossella, Francesco
name: Bertoni, Andrea
name: Ercolani, Daniele
name: Rontani, Massimo
name: Sorba, Lucia
name: Beltram, Fabio
name: Roddaro, Stefano
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The control of orbital and spin state of single electrons is a key ingredient for quantum information processing, novel detection schemes, and, more generally, is of much relevance for spintronics. Coulomb and spin blockade (SB) in double quantum dots (DQDs) enable advanced single-spin operations that would be available even for room-temperature applications for sufficiently small devices. To date, however, spin operations in DQDs were observed at sub-Kelvin temperatures, a key reason being that scaling a DQD system while retaining an independent field-effect control on the individual dots is very challenging. Here we show that quantum-confined Stark effect allows an independent addressing of two dots only 5 nm apart with no need for aligned nanometer-size local gating. We thus demonstrate a scalable method to fully control a DQD device, regardless of its physical size. In the present implementation we show InAs/InP nanowire (NW) DQDs that display an experimentally detectable SB up to 10 K. We also report and discuss an unexpected re-entrant SB lifting as a function magnetic-field intensity.
Spectroscopy of ultracold neutrons using diffraction by a moving grating
Creators: name: Kulin, G. V.
name: Frank, A. I.
name: Goryunov, S. V.
name: Geltenbort, P.
name: Jentschel, M.
name: Bushuev, V. A.
name: Lauss, B.
name: Schmidt-Wellenburg, Ph.
name: Panzarella, A.
name: Fuchs, Y.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Spectra of ultracold neutrons that appeared in experiments on neutron diffraction by a moving grating were measured using the time-of-flight Fourier spectrometer. Diffraction lines of five orders were observed simultaneously. The obtained data are in good agreement with the theoretical predictions based on the multiwave dynamical theory of neutron diffraction by a moving grating.
description: Submitted to Phys. Rev. A
Study on the Impact of Surface Roughness on Germanium TPV Cell Performance
Creators: name: Van Der Heide, J.
name: Flamand, G.
name: Dessein, K.
name: Poortmans, J.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Advanced Photovoltaics: New Concepts and Ultra-high Efficiency
New Materials, Cells and Modules

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 627-630
description: A next step in the fabrication of low-cost thermophotovoltaic cells based on germanium is the
realization of TPV cells on substrates which do not have an epi-ready front surface finishing. Since imec’s
proprietary TPV cell fabrication process does not include any epitaxial growth, substrates with such an excellent
surface finishing are not required. The transfer of the process from epi-ready substrates to substrates with a
specifically engineered front and rear surface only requires small adaptations on the emitter formation. Since an
emitter is formed by diffusion from a spin-on dopant source, the risk of interruptions in the emitter due to the rougher
surfaces increases. An increase of the P-concentration in the spin-on dopant source, together with a reduction of the
spin speed solved this issue. The TPV cells on the new type of substrates showed the same IV-performance under
AM1.5G light compared to the standard TPV cells and even a better performance in the long wavelength range
relevant for TPV applications, as evidenced by an increased quantum efficiency.
Invariance to ordinal transformations in rank-aware databases
Creators: name: Vychodil, Vilem
Publisher: name: arXiv
Year: 2016
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences
subject: H.2.3; H.2.4; I.2.4
subject: 68P15, 03B52

description: We study influence of ordinal transformations on results of queries in rank-aware databases which derive their operations with ranked relations from totally ordered structures of scores with infima acting as aggregation functions. We introduce notions of ordinal containment and equivalence of ranked relations and prove that infima-based algebraic operations with ranked relations are invariant to ordinal transformations: Queries applied to original and transformed data yield results which are equivalent in terms of the order given by scores, meaning that top-k results of queries remain the same. We show this important property is preserved in alternative query systems based of relational calculi developed in context of Gödel logic. We comment on relationship to monotone query evaluation and show that the results can be attained in alternative rank-aware approaches.
Effect of Electrical Filtering on Level Dependent ASE Noise
Creators: name: Witzens, Jeremy
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We derive an analytical model describing the effect of filtering on amplified spontaneous emission noise during or after opto-electronic conversion. In particular, we show that electrical filtering results in a further reduction of the signal quality factor associated with an effective increase of the noise levels and can lead to counter-intuitive dependencies of the measured signal quality on the characteristics of the test setup. Closed form equations are compared with numerical models and experiments, showing excellent agreement.