cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum transport in ferromagnetic graphene: Role of Berry curvature
Creators: name: Chowdhury, Debashree
name: Basu, B
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The magnetic effects in ferromagnetic graphene basically depend on the principle of exchange interaction when ferromagntism is induced by depositing an insulator layer on graphene. Here we deal with the consequences of non-uniformity in the exchange coupling strength of the ferromagnetic graphene. We discuss how the in- homogeneity in the coordinate and momentum of the exchange vector field can provide interesting results in the conductivity analysis of the ferromagnetic graphene. Our analysis is based on the Kubo formalism of quantum transport.
description: Conference proceedings in ICNPAA 2014
Loss Analysis of Grid-Connected PV System Using Yield Model
Creators: name: So, J.H.
name: Hwang, H.M.
name: Yu, B.G.
name: Yoo, J.S.
name: Yu, G.J.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4269-4271
description: One of the main aims of PV system is to enhance the performance of installed PV system. An essential
part of such work is in understanding the energy losses which occur in installed PV systems and developing methods
to minimize these energy losses. Some losses, such as the energy lost in the conversion of irradiance to output power
by the PV system, are unavoidable and can only be significantly reduced by improvements in the technology of PV
system components. Other energy losses, such as shading, snow and dirt, are related to the installation of the PV
systems and can be minimized through careful planning, design and operation. This paper presents loss analysis of
grid-connected PV system using performance yield model with three year monitored data. These results will indicate
that it is useful to develop reliable tool to predict various energy losses causing performance obstruction and enhance
the lifetime yield of PV system for long-term operation.
Boundary controllability of a nonlinear coupled system of two Korteweg-de Vries equations with critical size restrictions on the spatial domain
Creators: name: Capistrano-Filho, Roberto A.
name: Gallego, Fernando A.
name: Pazoto, Ademir F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q53, 37K10, 93B05, 93D15

description: This article is dedicated to improve the controllability results obtained by Cerpa et al. in Commun. Contemp. Math 13 (2011) and by Micu et al. in Commun. Contemp. Math 11 (5) (2009) for a nonlinear coupled system of two Korteweg-de Vries (KdV) equations posed on a bounded interval. Initially, in Micu et al., the authors proved that the nonlinear system is exactly controllable by using four boundary controls without any restriction on the length L of the interval. Later on, in Cerpa et al., two boundary controls were considered to prove that the same system is exactly controllable for small values of the length L and large time of control T. Here, we use the ideas contained in Capistrano-Filho et al. (arXiv 1508.07525) to prove that, with another configuration of four controls, it is possible to prove the existence of the so-called critical length phenomenon for the nonlinear system, i. e., whether the system is controllable depends on the length of the spatial domain. In addition, when we consider only one control input, the boundary controllability still holds for suitable values of the length L and time of control T. In both cases, the control spaces are sharp due a technical lemma which reveals a hidden regularity for the solution of the adjoint system.
description: arXiv admin note: text overlap with arXiv:1602.00742
A Conserved Cross Helicity for Non-Barotropic MHD
Creators: name: Yahalom, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Cross helicity is not conserved in non-barotropic magnetohydrodynamics (MHD) (as opposed to barotropic or incompressible MHD). Here we show that variational analysis suggests a new kind of cross helicity which is conserved in the non barotropic case. The non barotropic cross helicity reduces to the standard cross helicity under barotropic assumptions. The new cross helicity is conserved even for topologies for which the variational principle does not apply.
description: 3 pages. arXiv admin note: text overlap with arXiv:1510.00637
An elastic lidar system for the H.E.S.S. Experiment
Creators: name: Bregeon, J.
name: Compin, M.
name: Rivoire, S.
name: Sanguillon, M.
name: Vasileiadis, G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The H.E.S.S. experiment in Namibia, Africa, is a high energy gamma ray tele- scope sensitive in the energy range from 100 Gev to a few tens of TeV, via the use of the atmospheric Cherenkov technique. To minimize the systematic errors on the derived fluxes of the measured sources, one has to calculate the impact of the atmospheric properties, in particular the extinction parameter of the Cherenkov light ( 300-650 nm) exploited to observe and reconstruct atmospheric particle showers initiated by gamma-ray photons. A lidar can provide this kind of information for some given wavelengths within this range. In this paper we report on the hardware components, operation and data acquisition of such a system installed at the H.E.S.S. site.
description: Submitted to NIM A. arXiv admin note: text overlap with arXiv:1311.3760
Defect-Density Distribution in Microcrystalline Silicon Prepared at High Growth Rate
Creators: name: Iwata, M.
name: Tanaka, M.
name: Sobajima, Y.
name: Toyama, T.
name: Sada, C.
name: Matsuda, A.
name: Okamoto, H.
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; 2967-2970
description: We have adopted high-precision electron-spin-resonance (ESR) system to evaluate the spatial
distribution of dangling-bond defects in hydrogenated microcrystalline silicon (μc-Si:H) thin films. On the basis of
experimental results, we suggest that dangling-bond defects are located not only at grain boundaries of crystallites but
also distributed uniformly in μc-Si:H, supporting our growth model of μc-Si:H from plasma-enhanced chemicalvapour
deposition (PECVD) where dangling bonds are created both by thermal hydrogen-removal events on the filmgrowing
surface and by the contribution of short lifetime chemical species such as SiH2, SiH, and Si to film growth.
The spatial distribution of dangling bond defects are quite different from that in poly-crystalline Si prepared by melt
and cooling method. We have also found that a plenty of dangling bonds are located at the interface of μc-Si:H
especially when the film is deposited at high growth rate.
The role of microenvironment in the initiation and evolution of B-cell precursor acute lymphoblastic leukemia.
Creators: name: Garcia-Gimenez, Alicia
name: Richardson, Simon E
Publisher: name: Apollo - University of Cambridge Repository
Year: 2023
Subjects: B- cell precursor acute lymphoblastic leukemia (BCP-ALL)
chemoresistance
epigenetics
microenvironment
tumor evolution

description: Peer reviewed: True
description: B cell precursor acute lymphoblastic leukemia (BCP-ALL) is a malignant disorder of immature B lineage immune progenitors and is the commonest cancer in children. Despite treatment advances it remains a leading cause of death in childhood and response rates in adults remain poor. A preleukemic state predisposing children to BCP-ALL frequently arises in utero, with an incidence far higher than that of transformed leukemia, offering the potential for early intervention to prevent disease. Understanding the natural history of this disease requires an appreciation of how cell-extrinsic pressures, including microenvironment, immune surveillance and chemotherapy direct cell-intrinsic genetic and epigenetic evolution. In this review, we outline how microenvironmental factors interact with BCP-ALL at different stages of tumorigenesis and highlight emerging therapeutic avenues.
Integrating High Penetrations of PV into Southern California
Creators: name: Kroposki, B.
name: Mather, B.
name: Hasper-Tuttle, J.
name: Neal, R.
name: Katiraei, F.
name: Yazdani, A.
name: Romero Aguero, J.
name: Hoff, T.E.
name: Norris, B.L.
name: Parkins, A.
name: Seguin, R.
name: Schauder, C.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4197-4200
description: California regulators recently approved a plan proposed by Southern California Edison (SCE) to install 500
MW of distributed photovoltaic (PV) energy in its utility service territory over the next 5 years. The installations will
include 250 MW of utility-owned solar and 250 MW of independently owned solar. SCE expects that the majority of
these systems will be commercial-scale rooftop PV systems connected at various points in the distribution system. Each
of the SCE rooftop PV systems will typically have a rating of 1-3 MW. To understand the impact of high-penetration PV
on the distribution grid, the National Renewable Energy Laboratory (NREL) and SCE brought together a team of experts
in resource assessment, distribution modeling, and planning to help analyze the impacts of adding high penetration of PV
into the distribution system. Through modeling and simulation, laboratory testing, and field demonstrations, the team will
address the issues identified in the analysis by fully examining the challenges, developing solutions, and transitioning
those solutions to the field for large-scale deployment. This paper gives an update on the project and discusses technical
results of integrating a large number of distributed PV systems into the grid.
A Preliminary Weather-Crop Yield Model for Soviet Grain
Creators: name: Zabijaka, Valentine
name: Zabijaka, Valentine
Publisher: name: Unknown
Year: 1974
Subjects: Crop Production/Industries
Productivity Analysis
Research Methods/ Statistical Methods

description: Introduction: Much research has been directed toward the problem of relating crop yields to weather. The value of a model that would show the effect of weather factors, such as temperature and precipitation, on the yield of a specific crop can be easily justified. Perhaps the most important use of a predictive weather-crop yield model would be in evaluating the potential production of a given crop. The analysis that follows is a brief review of preliminary research aimed at estimating the effects of weather (temperature, precipitation, and soil moisture), fertilizer use, and, in some instances, time on wheat yields in the USSR. Regression analysis was used to determine weather variables that significantly influence crop yields. The resulting regression equations are used to "predict" wheat yields in the USSR for 1972 and 1973. Basic research was completed in August 1973. Minor revisions include incorporation of data on plan fulfillment, published in January 1974.
description: Based on a paper presented by Valentine Zabijaka, formerly Economic Research Service, U.S. Department of Agriculture, at a Seminar sponsored by the Foreign Demand and Competition Division, Economic Research Service, September 14, 1973.
Inline Dynamic Deposition of a-Si:H and μc-Si:H Thin-Film Solar Cells
Creators: name: Zimmermann, T.
name: Flikweert, A.J.
name: Weigand, D.
name: Appenzeller, W.
name: Beyer, W.
name: Gordijn, A.
name: Strobel, C.
name: Albert, M.
name: Dybek, K.
name: Palme, J.
name: Schade, K.
name: Hartung, J.
name: Steinke, O.
name: Stahr, F.
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; 2983-2986
description: An alternative concept for the dynamic deposition of amorphous and microcrystalline silicon is
presented in this paper. The aim of our work is to combine Very High Frequency PECVD with a linear plasma
source in order to demonstrate high efficiency cells and high deposition rates at the same time. Due to the design of
the linear plasma source the homogeneity has to be guaranteed in the direction perpendicular to the substrate
movement. In movement direction the homogeneity is achieved by stable plasma conditions throughout the
deposition. So far amorphous solar cells with initial efficiencies of 9.2 % and microcrystalline solar cells with an
efficiency of 6.6 % have been produced. The static deposition rates were 0.56 nm/s and 0.43 nm/s respectively.
Comparison of Different PV Technologies in Three Italian Locations
Creators: name: Marzoli, M.
name: Guastella, S.
name: Giussani, M.
name: Colli, A.
name: Fanni, L.
name: Zaaiman, W.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4254-4261
description: The number of photovoltaic installations in Italy is constantly increasing, so that an outdoor performance
analysis of various types of PV modules is useful. The purpose to assess and compare the performance of different types
of modules in specific geographical locations, under various climatic conditions and to identify benefits/losses given by a
specific surrounding context, is very important to evaluate the energetic behaviour of future installations and direct them
toward the most suitable technology to apply. The installations taken into consideration are located in Bolzano, Milan and
Catania, allowing comparison among three different Italian climate conditions and irradiance levels: the Alpine region,
the upper Padana valley, and the see-side area in Sicily. In Bolzano, a multi-technology ground-mounted PV field is
taken into analysis. The plant, has a total peak power of 724 kWp. It is divided into two main parts: a 662 kWp
commercial installation, mounting 8538 CdTe modules First Solar 277, and a 62 kWp experimental installation,
mounting 24 different types of modules, divided into groups ranging between 1 and 2 kW each. For Milan and Catania,
two multi-section PV power plants are monitored. Each plant is made by 8 sections of different technologies:
polycrystalline silicon, high-performance monocrystalline silicon, CIGS, CdTe and amorphous silicon. The power of
each PV plant is around 10 kWp. The power production in Milan and Catania is monitored with a special system to
evaluate the current and voltage specific values on the DC and AC side of the inverter, allowing also a comparison with
the inverter monitoring system, which is used in Bolzano Results are provided in a comparative way among the three
considered geographical locations. They include evaluations on performance indicators and on different PV technologies
concerning their power output and energy performance expressed by various performance indicators. Conclusions are
based on the monitoring results registered for the upcoming months. Possible issues related to monitoring activities, as
well as the performance of different PV technologies, are highlighted. The results are specific for the three indicated
areas, but will also be indicative for locations with similar characteristics.
8-Month Performance of Thin Film Technologies during Their First Year at Bolzano Airport Test Installation - Italy
Creators: name: Nikolaeva-Dimitrova, M.
name: Fanni, L.
name: Sparber, W.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4265-4268
description: This paper presents monitoring results over a 8-month period of time for different thin-film
photovoltaic (PV) technologies installed at the multi-technology rack-mounted PV test field at the Airport of
Bolzano Dolomiti (ABD) in the Italian Alps. In the evaluation, different technologies were cross-compared:
amorphous silicon (a-Si), copper indium gallium diselenide (CIS/CIGS) and micromorph silicon (a-Si/μ-Si). The
various thin-film technologies were compared according to their performance ratio. Additionally the modules
behavior were compared with those of the best crystalline Si (c-Si) in the field. The presented results refers to DC
values. The PV modules were evaluated in relation to meteorological data registered on-site.
Near-Field Study of Spatially Resolved Light Scattering in Thin-Film Silicon Solar Cells
Creators: name: Bittkau, K.
name: Beckers, T.
name: Carius, R.
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; 2996-2999
description: A method to extract spatially and angularly resolved light scattering in thin-film solar cells from
near-field scanning optical microscopy (NSOM) images is developed which applies Fourier band-pass filters to
the experimentally obtained near-field images. The analysis allows the identification of individual surface
structures of randomly textured interfaces which provide high light trapping potential. It will be shown that the
local light scattering properties and, thus, the light trapping strongly differ on a microscopic scale. The
visualization of local light trapping efficiency by NSOM is demonstrated in a thin-film silicon solar cell.
Contact Resistance Determination of Silver Screen Printable Paste for Back Solderable Contact on p-Type c-Si Solar Cells
Creators: name: Serenelli, L.
name: Izzi, M.
name: De Iuliis, S.
name: Tucci, M.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Characterisation and Modelling

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1478-1481
description: The majority of PV market is covered by p-type mono or multi crystalline silicon based solar cells.
Conventional p-type crystalline silicon solar cell technology involves a front phosphorous diffused emitter covered
by a silicon nitride layer and contacted by a screen printed silver grid, while at the back the screen-printed aluminium
back surface field is complementary to the screen-printed busbars. Common screen printable aluminium pastes, are
able to form deep and effective industrial aluminium back surface field, providing also surface recombination
velocity values in the range of few hundreds cm/s. Unlikely aluminium is not suitable to be soldered, thus the cells
interconnection into module would not be possible without using solderable metal pads. The nowadays trend is to use
purely silver paste for such areas, which is better in terms of solderability and conductivity than the AgAl paste used
up to now, although shows worst contact properties with the p-type silicon. The purpose of this work is to compare
commercial available conventional Ag/Al paste and Ag paste ad hoc designed for back busbar contacting.
Light and Heat Induced Degradation Study of Elkem Solar Silicon Solar Cells
Creators: name: Tayyib, M.
name: Sætre, T.O.
name: Midtgård, O.-M.
name: Odden, J.O.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Characterisation and Modelling

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1503-1506
description: Multicrystalline solar cells of two different silicon production routes have been tested by light and heat induced
degradation. Solar cells made of standard poly silicon cells have been experimentally compared to cells produced
with the Elkem Solar Silicon (ESS) material. Initially, the two types of cells performed similarly, with efficiencies of
about 16%. The experiments demonstrate a high potential of such methods for studying accelerated degradation
phenomena. However, since the number of cells examined is limited, major conclusions cannot be drawn from the
present results.
Japanese to keep order: proclamations issued by Commander in Chief of the Japanese Army and Navy in the Shanghai area
Creators: name: Commanders-In-Chief Of The Japanese Army And Navy In The Shanghai Area
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Personal narratives--British
valueUri: http://id.worldcat.org/fast/1424087
subject: Abkhazi, Peggy, 1902-
valueUri: http://id.worldcat.org/fast/163887
subject: World War (1939-1945)
valueUri: http://id.worldcat.org/fast/1180924
subject: Sino-Japanese War (1937-1945)
valueUri: http://id.worldcat.org/fast/1431391
subject: International relations
valueUri: http://id.worldcat.org/fast/977053
subject: Proclamations
valueUri: http://id.worldcat.org/fast/1078085
subject: History
valueUri: http://id.worldcat.org/fast/958235

description: A proclamation issued by Commander in Chief of the Japanese Army and Navy in the Shanghai area during World War II.
Picosecond Laser Ablation of TCO (Transparent Conductive Oxide) Films on Glass for Thin-Film Silicon Solar Cells
Creators: name: Tran, D.V.
name: Yap, Q.J.
name: Aberle, A.G.
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; 2960-2962
description: The local ablation of a TCO (transparent conductive oxide) film on a glass substrate is investigated,
using picosecond laser pulses with a wavelength of 1064 nm. When irradiating the TCO film through the glass with
high energy laser pulses, we find that not only the TCO layer is ablated but also a certain thickness of glass is
removed. Significant damage and thinning of the glass is observed even at low laser power. In contrast, when
irradiating the TCO film from the air side with picosecond laser pulses, the resulting ablation depth is much smaller
compared to that obtained from the glass side.
Firefighting at PV Plants - Different Solutions for Protection Against Electric Shock During Firefighting
Creators: name: Häring, A.
name: Laschinski, J.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4241-4244
description: Because of its physical behaviour, PV systems can’t be
completely switched off during daytime. In case of fire it is possible, that several wires are damaged. So, there is a
certain risk for an electric shock for firefighter while extinguishing a fire at a PV plant or a building with PV. In a
increasing number of countries are discussions about the “firemen’s issue”. Often these discussions results in a call
for so called firemen’s switches. But the real question is, what it is necessary to protect? Depending on the goals for
protection, different solutions are possible. The switches are one solution, but there are some possibilities in the way
of installing a plant in addition. Depending on the plant-orientated risk analysis the installer should choose a safe and
cost-effective solution.
Comparing the properties of the X-shaped bulges of NGC 4710 and the Milky Way with MUSE
Creators: name: Gonzalez, O. A.
name: Gadotti, D. A.
name: Debattista, V. P.
name: Rejkuba, M.
name: Valenti, E.
name: Zoccali, M.
name: Coccato, L.
name: Minniti, D.
name: Ness, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We used the new ESO VLT instrument MUSE to obtain spectral and imaging coverage of NGC 4710. The wide area and excellent sampling of the MUSE integral field spectrograph allows us to investigate the dynamical properties of the X-shaped bulge of NGC 4710 and compare it with the properties of the Milky Way's own X-shaped bulge. We measured the radial velocities, velocity dispersion, and stellar populations using a penalized pixel full spectral fitting technique adopting simple stellar populations models, on a 1' x 1' area centred on the bulge of NGC 4710. We have constructed the velocity maps of the bulge of NGC 4710 and we investigated the presence of vertical metallicity gradients. These properties were compared to those of the Milky Way bulge and as well as to a simulated galaxy with boxy/peanut bulge. We find the line-of-sight velocity maps and 1D rotation curves of the bulge of NGC 4710 to be remarkably similar to those of the Milky Way bulge. Some specific differences that were identified are in good agreement with the expectations from variations in the bar orientation angle. The bulge of NGC 4710 has a boxy-peanut morphology with a pronounced X-shape, showing no indication of any additional spheroidally distributed bulge population, in which we measure a vertical metallicity gradient of 0.35 dex/kpc. The general properties of NGC 4710 are very similar to those observed in the MW bulge. However, it has been suggested that the MW bulge has an additional component that is comprised of the oldest, most metal-poor stars and which is not part of the boxy-peanut bulge structure. Such a population is not observed in NGC 4710, but could be hidden in the integrated light we observed.
description: Accepted for publication in A&A
Local growth of icosahedral quasicrystalline tilings
Creators: name: Hann, Connor
name: Socolar, Joshua E. S.
name: Steinhardt, Paul J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Icosahedral quasicrystals (IQCs) with extremely high degrees of translational order have been produced in the laboratory and found in naturally occurring minerals, yet questions remain about how IQCs form. In particular, the fundamental question of how locally determined additions to a growing cluster can lead to the intricate long-range correlations in IQCs remains open. In answer to this question, we have developed an algorithm that is capable of producing a perfectly ordered IQC, yet relies exclusively on local rules for sequential, face-to-face addition of tiles to a cluster. When the algorithm is seeded with a special type of cluster containing a defect, we find that growth is forced to infinity with high probability and that the resultant IQC has a vanishing density of defects. The geometric features underlying this algorithm can inform analyses of experimental systems and numerical models that generate highly ordered quasicrystals.
description: 13 pages, 15 figures, 1 table
Impact of Cu(InGa)(SeS)2 Absorber Quality and Circuit Uniformity on Improved Efficiency; Application of Photoluminescence and Electroluminescence Techniques
Creators: name: Sugimoto, H.
name: Aramoto, T.
name: Kawaguchi, Y.
name: Chiba, Y.
name: Kijima, S.
name: Fujiwara, Y.
name: Tanaka, Y.
name: Hakuma, H.
name: Kakegawa, K.
name: Kushiya, K.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
CIS and Other (II-VI) Ternary Thin Film Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2465-2468
description: The efficiency of 15.7 % on a 30x30cm2-sized Cu(InGa)(SeS)2 (CIS)-based thin-film circuit has been
achieved by improving its absorber quality and circuit uniformity. For refining the absorber quality,
photoluminescence (PL) technique is introduced as a direct diagnosis of the absorber quality. The PL intensity has a
strong correlation with the circuit performance, i.e., a product term of a short-circuit current density (Jsc) and an
open-circuit voltage (Voc), Jsc x Voc. The absorber uniformity is evaluated by PL mapping. Most absorbers are highly
uniform, however numerous dot-like defects are observed in some low-grade absorbers. The circuit uniformity is
assessed by electroluminescence (EL) technique. Low performance regions in the circuit are identified as low ELintensity
regions. The EL image obtained under different induced-current conditions contributes to understand whether
the shunt or series resistance affects the circuit performance. The EL patterns also indicate the origin of lower
performance. The avobe mentioned PL and EL results can be promptly fed back to our fabrication process, which
enables us to develope higher efficiency circuits. Finally, our conclusion is the absorber quality and the circuit
uniformity are important keys to improve the circuit performance, and the PL and EL methods are effective tools to
evaluate the CIS-based thin-film circuit.
Ligand-Surface Interactions and Surface Oxidation of Colloidal PbSe Quantum Dots Revealed by Thin-film Positron Annihilation Methods
Creators: name: Shi, Wenqin
name: Eijt, Stephan W. H.
name: Sandeep, C. S. Suchand
name: Siebbeles, Laurens D. A.
name: Houtepen, Arjan J.
name: Kinge, Sachin
name: Brück, Ekkes
name: Barbiellini, Bernardo
name: Bansil, Arun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Positron Two Dimensional Angular Correlation of Annihilation Radiation (2D-ACAR) measurements reveal modifications of the electronic structure and composition at the surfaces of PbSe quantum dots (QDs), deposited as thin films, produced by various ligands containing either oxygen or nitrogen atoms. In particular, the 2D-ACAR measurements on thin films of colloidal PbSe QDs capped with oleic acid ligands yield an increased intensity in the electron momentum density (EMD) at high momenta compared to PbSe quantum dots capped with oleylamine. Moreover, the EMD of PbSe QDs is strongly affected by the small ethylediamine ligands, since these molecules lead to small distances between QDs and favor neck formation between near neighbor QDs, inducing electronic coupling between neighboring QDs. The high sensitivity to the presence of oxygen atoms at the surface can be also exploited to monitor the surface oxidation of PbSe QDs upon exposure to air. Our study clearly demonstrates that positron annihilation spectroscopy applied to thin films can probe surface transformations of colloidal semiconductor QDs embedded in functional layers.
description: 20 pages, 4 figures, Supplemental Material (5 pages)
Modification to the Standard Reference Environment (SRE) for Nominal Operating Cell Temperature (NOCT) to Account for Building Integration
Creators: name: Sample, T.
name: Virtuani, 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; 3332-3337
description: In this paper we have investigated the use of modification to the “Standard Reference Environment” to
account for Building Applied PV (BAPV) and Building Integrated PV (BIPV) applications. The values of the NOCT
rise from the open-rack mounted to BAPV and finally to maximum values under BIPV conditions. The NOCT values
for the thin-film glass/glass modules are generally higher than the crystalline glass/polymer modules for each of the
three mounting options. The impact of changing the module operating condition from open-circuit to resistive load is
a clear lowering of the NOCT value of approximately 3oC for the thin-film glass/glass open-rack mounting condition.
The resistive load had practically no impact for the BAPV and BIPV cases. Further work is needed to determine if
the results of this study will lead to the definitions of new “reference environments for building integrated products”
or the application of some multiplication factor to the current NOCT value to account for the installation method.
"General theory of a particle mechanics" arising from a fractal surface
Creators: name: Yefremov, Alexander P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The logical line is traced of formulation of theory of mechanics founded on the basic correlations of mathematics of hypercomplex numbers and associated geometric images. Namely, it is shown that the physical equations of quantum, classical and relativistic mechanics can be regarded as mathematical consequences of a single condition of stability of exceptional algebras of real, complex and quaternion numbers under transformations of primitive constituents of their units and elements. In the course of the study a notion of basic fractal surface underlying the physical three-dimensional space is introduces, and an original geometric treatment (admitting visualization) of some formerly considered abstract functions (mechanical action, space-time interval) are suggested.
description: 13 pages
A Concentrator System for BI-CPVT with Static Linear Fresnel Lenses
Creators: name: Swinkels, G.L.A.M.
name: Sonneveld, P.J.
name: Van Tuijl, B.A.J.
name: Janssen, H.J.J.
name: De Zwart, H.F.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
PV and Architecture

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4179-4183
description: A greenhouse with Fresnel lenses in the south facing roof and a receiver for concentrated Photovoltaic  with water cooling (CPVT system) will result in electrical and thermal energy output from the solar energy excess entering a greenhouse. The PV system converts about half of the direct radiation into heat and electricity. During periods with direct radiation this will significantly reduce the heat load on the greenhouse  For an optimal performance the roof elements must be asymmetric with a steep inclination at the north side (the exact angle of course depends on the latitude of the building site). The Fresnel lens structure is best oriented in upwards direction. In the current design, two lenses are placed in the inner space of a double glass. This  prevents pollution and condensation on the lenses. By the upward facing of the lens structure, the focus quality is preserved over a much broader range of angles of incidence compared to a lens with downward facing structures. Each PMMA lens with a size of 1.20m x 1.52m is composed of 12 ‘tiles’ for easy production. The focal distance of the lens is 1,875m and the geometrical concentration factor is 50×. This means that in most cases the focus line is thinner than 3 cm. The performance of the lens with respect to the shape of the focal area and the position of the focal line has been analyzed with ray tracing techniques. From this analyses and by the development of a smart tracking system only two motors can bring the receivers in the required positions. One motor controls the distance between lens and receiver and the other controls the translocation of the receivers parallel to the lens. The second conclusion was that the positions of the focal line are within the bounds of the greenhouse construction for almost the whole year. Only in winter, in the early morning and at the end of the day, the focal line will be unreachable. The light sum is very stable in the greenhouse compared with the light sum outside. The 480 m2 greenhouse, with the LCPVT system based on Static Fresnel lenses and a 12 m CPVT-module and a 200 m CT-module, is designed by Bode Project Engineering and constructed by Technokas in Bleiswijk the Netherlands. An electrical power of 37W/(m2 greenhouse) is measured at an incoming global radiation of 870 W/m² (on a horizontal plane). The fraction collected thermal yield is about 20% of the total incident direct radiation.
Preprints e a pandemia do COVID-19: uma análise na base de dados Dimensions
Creators: name: Ceslinski, Alessa Fabíola dos Santos
name: Príncipe, Eloísa
Publisher: name: Zenodo
Year: 2022

description: Apresentação realizada na sessão Comunicação III da 13ª Conferência Lusófona de Ciência Aberta, formato híbrido, de 10 a 12 de outubro de 2022.
Suhett Sukumar HEI 2023.pdf
Creators: name: Deluccia-Dall, Rosemary
name: Sukumar, Deeptha
Publisher: name: Health Research Alliance
Year: 2024
Subjects: classificationCode: 321004
subject: Nutritional science

description: Background: The Healthy Eating Index (HEI) estimates the diet quality, and low HEI scores are associated with adverse bone outcomes. However, the relationship between HEI scores and bone health in individuals who are obese but otherwise healthy or obese with comorbidities remains unclear.
Objective: We aimed to evaluate the association of HEI scores with bone mineral density (BMD), bone regulating hormones and bone turnover markers in individuals with metabolically healthy obese (MHO) and metabolically unhealthy obese (MUO) phenotypes.
Methods: This was a cross-sectional analysis of 122 adults who were overweight or obese. A questionnaire was completed to obtain demographic data. Body composition and BMD were assessed by a Dual Energy X-Ray Absorptiometry (DXA) exam. The HEI scores and dietary components were calculated using a 24-h dietary recall. Blood samples were collected for the analysis of serum 25-hydroxyvitamin D (s25OHD), total osteocalcin (OC), parathyroid hormone (PTH), and C-terminal telopeptide (CTx) concentrations. The MHO and MUO phenotypes were classified according to the absence or presence of metabolic abnormalities.
Results: The sample mean age was 37.91 ± 12.66 years, 50.8% were men, mean body mass index (BMI) was
30.01 ± 4.63 kg/m2, and 45.9% were classified as the MUO phenotype. The mean HEI scores were 54.42 ±
16.25 and 61.48% had low-diet quality. HEI scores were positively associated with s25OHD in the MUO phenotype group (β = 0.194, 95%CI = 0.038–0.350, p = 0.016). Certain dietary score components, such as fruits, seafood and plant protein, added sugars, whole grains, and fatty acids were also associated with bone health markers. However, HEI scores were not associated with BMD measures, neither with other bone regulating hormones and turnover markers.
Conclusion: There was a positive association between HEI scores and s25OHD in adults who were overweight or obese with MUO phenotype. Additionally, the adequate consumption of specific food groups may benefit bone mass and metabolism. These results emphasize the importance of lifestyle interventions encouraging healthy eating habits to prevent s25OHD deficiency, poor bone health, and cardiometabolic complications.
CBD-Zn(S,O) Buffer Layers for Cu-Chalcopyrite Solar Modules during Athlet Project: Present Status and Recent Developments
Creators: name: Ennaoui, A.
name: Sáez-Araoz, R.
name: Niesen, T.P.
name: Neisser, A.
name: Wilchelmi, K.
name: Lux-Steiner, M.C.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
CIS and Other (II-VI) Ternary Thin Film Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2429-2432
description: In the on-going ATHLET project: “Advanced Thin Film Technologies for Cost Effective
Photovoltaics”, the Helmholtz Center for materials and energy (HZB) cooperate in a joint effort with Sulfurcell
Solartechnik GmbH and AVANCIS GmbH & Co. KG for the development of Zn(S,O) buffer layers for Cuchalcopyrite
solar cells and modules. Production scale wide band gap CuInS2 (CIS, EG = 1.5 eV) provided by
Sulfurcell and pilot line low gap Cu(InGa)(SSe)2 (CIGSSe, EG = 1.03 eV) provided by Avancis are processed. Two
studies are simultaneously carried out: (1) fundamental understanding of the formation and subsequent development
of the CIS/Zn(S,O) and CIGSSe/Zn(S,O) junctions during the deposition of the buffer layers. This was achieved by
using surface sensitive methods such as: X-ray photoemission spectroscopy and high resolution scanning and
transmission microscopy. The dominant recombination mechanism in the ZnO/Zn(S,O)/Cu-chalcopyrite devices is
discussed based on the measurement of J-V characteristics in the dark and under illumination at variable temperature
and the determined valence band discontinuity at Zn(S,O)/Cu-chalcopyrite heterojunctions is studied.
(2) Maintaining the CBD process as simple as possible, the process was scaled up for larger area module up to 900
cm2. Highly efficient monolithically interconnected prototype CIS and CIGSSe modules with sizes ranging from
10×10 cm2 to 30×30 cm2 are produced and their performances are discussed.
Impact of PV Distributed Generation on Voltage Stability in the Host Distribution Grid Having Wind Generators
Creators: name: Hamzeh, A.
Publisher: name: WIP
Year: 2011
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 4192-4196
description: The embedded hybrid PV/wind generation may have significant impacts on the power system operation. These
impacts are not generic to any network, and consequently they could be positive, negative or neutral influences, depending on
the DS configuration, operation mode, and load profile. The paper aims at quantifying the impact of the hybrid generation on
the voltage profile of the host network. Because of the mostly happening two-way power flow in the active DS branches, and
the special character of DG designs, a mathematical model has been developed, which mainly differs from the conventional
power flow model in selection of slack bus and modeling of the generation buses. For achieving a systematic methodology, a
set of evaluation criteria and indices has been defined and mathematically formulated. Based on this mathematical
background, an algorithm has been proposed, which was designed so that it can be applied to any active DS containing
hybrid PV/Wind generation with different penetration and dispersion levels. The algorithm has been tested on typical DSs
using the program Power Factory DigSilent as an advanced simulation tool. A wide range of simulations have been carried
out, and the simulation results have been thoroughly discussed and very important findings have been concluded.
Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor
Creators: name: Sun, Hao-Hua
name: Zhang, Kai-Wen
name: Hu, Lun-Hui
name: Li, Chuang
name: Wang, Guan-Yong
name: Ma, Hai-Yang
name: Xu, Zhu-An
name: Gao, Chun-Lei
name: Guan, Dan-Dan
name: Li, Yao-Yi
name: Liu, Canhua
name: Qian, Dong
name: Zhou, Yi
name: Fu, Liang
name: Li, Shao-Chun
name: Zhang, Fu-Chun
name: Jia, Jin-Feng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Majorana fermion (MF) whose antiparticle is itself has been predicted in condensed matter systems. Signatures of the MFs have been reported as zero energy modes in various systems. More definitive evidences are highly desired to verify the existence of the MF. Very recently, theory has predicted MFs to induce spin selective Andreev reflection (SSAR), a novel magnetic property which can be used to detect the MFs. Here we report the first observation of the SSAR from MFs inside vortices in Bi2Te3/NbSe2 hetero-structure, in which topological superconductivity was previously established. By using spin-polarized scanning tunneling microscopy/spectroscopy (STM/STS), we show that the zero-bias peak of the tunneling differential conductance at the vortex center is substantially higher when the tip polarization and the external magnetic field are parallel than anti-parallel to each other. Such strong spin dependence of the tunneling is absent away from the vortex center, or in a conventional superconductor. The observed spin dependent tunneling effect is a direct evidence for the SSAR from MFs, fully consistent with theoretical analyses. Our work provides definitive evidences of MFs and will stimulate the MFs research on their novel physical properties, hence a step towards their statistics and application in quantum computing.
description: 4 figures 15 pages
Reaching 5E-13 short term frequency stability of the integrating sphere cold atom clock
Creators: name: Liu, P
name: Meng, Y L
name: Wan, J Y
name: Wang, X M
name: Wang, Y N
name: Xiao, L
name: Cheng, H D
name: Liu, L
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present an improvement of short term frequency stability of the integrating sphere cold atom clock after increasing the intensities of clock signals and optimizing the feedback loop of the clock. A short term frequency stability of $5.0\times10^{-13}τ^{-1/2}$ has been achieved and the limiting factors have been analyzed.
On the inconsistency between cosmic stellar mass density and star formation rate up to $z\sim8$
Creators: name: Yu, H.
name: Wang, F. Y.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In this paper, we test the discrepancy between the stellar mass density and instantaneous star formation rate in redshift range $06$), the derived star formation history is consistent with the observations. This is the first time to test the discrepancy between the observed stellar mass density and instantaneous star formation rate up to very high redshift $z\approx8$ using the Markov chain monte carlo method and a varying recycling factor. Several possible reasons for this discrepancy are discussed, such as underestimation of stellar mass density, initial mass function and cosmic metallicity evolution.
description: 26 pages, 8 figures, 2 tables, accepted for publication in ApJ
Anomalous coercivity enhancement with temperature and tunable exchange bias in Gd and Ti co-doped BiFeO$_3$ multiferroics
Creators: name: Ahmmad, Bashir
name: Islam, M. Z.
name: Billah, Areef
name: Basith, M. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have investigated the effect of temperature on magnetic properties of Bi$_{0.9}$Gd$_{0.1}$Fe$_{1-x}$Ti$_x$O$_3$ (x = 0.00-0.20) multiferroic system. Unexpectedly, the coercive fields ($H_{c}$) of this multiferroic system increased with increasing temperature. The coercive fields and remanent magnetization were higher over a wide range of temperatures in sample x = 0.10 i.e. in sample having composition Bi$_{0.9}$Gd$_{0.1}$Fe$_{0.9}$Ti$_{0.1}$O$_3$ than those of x = 0.00 and 0.20 compositions. Therefore, we have carried out temperature dependent magnetization experiments extensively for sample x = 0.10. The magnetic hysteresis loops at different temperatures exhibit an asymmetric shift towards the magnetic field axes which indicate the presence of exchange bias effect in this material system. The hysteresis loops were also carried out at temperatures 150 K and 250 K by cooling down the sample from 300 K in various cooling magnetic fields ($H_{cool}$). The exchange bias field ($H_{EB}$) values increased with $H_{cool}$ and decreased with temperature. The $H_{EB}$ values were tunable by field cooling at temperatures up to 250 K.
description: 7 pages