cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Insights on Cell Edge Defects Impact and Post-Process Repassivation for Heterojunction
Creators: name: Portaluppi, B.
name: Harrison, S.
name: Giglia, V.
name: Sekkat, A.
name: Munoz-Rojas, D.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Low Temperature Route for Si Cells

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 504-507
description: Shingle and half-cell integration are both very promising paths to boost power module without modification of heterojunction (SHJ) solar cell structure. However, significant efficiency losses are measured after the cell cut-step, linked to the newly unpassivated edge generated. Hence, photovoltaic industry has to face new challenges to fully benefit from these new designs and develop solutions to either reduce the impact of the cleavage or be able to recover the cut-losses thanks to dedicated post-process steps. Currently thermo-mechanical separation and laser scribing are the most common techniques used for the wafer splitting and both lead to similar final electrical losses at cell level, around -0.3% absolute efficiency degradation for example for half-cell. However, edge final morphology and defect nature remains very different with for instance a much smoother edge obtained for the thermos-mechanical process. In this work, we firstly intend to give guidelines to understand the impact of the edge defects on cell performance, and highlight the importance of controlling the extra-damages brought by the cut process on the final edge morphology quality. Indeed, repassivation process impact (necessary to recover the power losses), as shown in the second part of the study, can be strongly dependent of the chosen separation technique. Finally, different post-process repassivation approaches, adapted to SHJ technology specificities, will be presented along with first results obtained on SHJ cells.
Dynamical indicators for the prediction of bursting phenomena in high-dimensional systems
Creators: name: Farazmand, Mohammad
name: Sapsis, Themistoklis
Publisher: name: arXiv
Year: 2016
Subjects: subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Drawing upon the bursting mechanism in slow-fast systems, we propose indicators for the prediction of such rare extreme events which do not require a priori known slow and fast coordinates. The indicators are associated with functionals defined in terms of Optimally Time Dependent (OTD) modes. One such functional has the form of the largest eigenvalue of the symmetric part of the linearized dynamics reduced to these modes. In contrast to other choices of subspaces, the proposed modes are flow invariant and therefore a projection onto them is dynamically meaningful. We illustrate the application of these indicators on three examples: a prototype low-dimensional model, a body forced turbulent fluid flow, and a unidirectional model of nonlinear water waves. We use Bayesian statistics to quantify the predictive power of the proposed indicators.
Alternative CZ Ingot Squaring and Half-Cell Cutting Methodology for Low-Temperature PV Cell and Module Technologies
Creators: name: Lelièvre, J.F.
name: Harrison, S.
name: Albaric, M.
name: Carton, L.
name: Portaluppi, B.
name: Barth, V.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Low Temperature Route for Si Cells

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 487-489
description: An interdisciplinary work has been performed between three labs of CEA-LITEN, going from CZ ingot pulling to ½ cell module fabrication, and demonstrating the capability of an alternative low-temperature methodology for cutting cells in half cells (or x sub-cells for shingle module architecture) without using standard laser scribing. This simple and efficient cell cleavage technology implies minimal technological changes, making it fully compatible with the whole fabrication chain of low temperature PV cell and module technologies.
Program, "Johnny Cash: America's Foremost Singing Storyteller"
Creators: name: Holiff, Saul, 1925-2005
Publisher: name: University of Victoria Libraries
Year: 2021
Subjects: subject: Music trade--Management
valueUri: http://id.worldcat.org/fast/1030650
subject: Country musicians
valueUri: http://id.worldcat.org/fast/881442
subject: Cash, Johnny
valueUri: http://id.worldcat.org/fast/31281
subject: Holiff, Saul, 1925-2005
valueUri: http://id.worldcat.org/fast/1958130
subject: Music--Marketing
valueUri: http://id.worldcat.org/fast/1030391

description: Program cover that reads, "Johnny Cash: America's Foremost Singing Storyteller." Includes a full-length picture of Cash dressed in black and holding a guitar.
Silver- and Indium-Free Silicon Heterojunction Solar Cell
Creators: name: Lachowicz, A.
name: Christmann, G.
name: Descoeudres, A.
name: Nicolay, S.
name: Ballif, C.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Low Temperature Route for Si Cells

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 490-492
description: Currently about 2000 tons of silver are consumed for 100 GW PV production per year and this are 10% of the entire world annual silver supply. Annual production volumes in the terawatt range are predicted by renowned experts already for 2030 and replacement of expensive and rare elements becomes imperative to sustain PV production on such a large scale. Replacement of silver has already been demonstrated and several process options for copper plating on heterojunction cells exist. With our plating sequense, comprising a PVD seed layer and hotmelt inkjet patterning and compatible with chemically resistant thin conductive oxides such as ITO or IWO, high efficiency of 24.7% has been achieved on industrial heterojunction cell precursors and excellent module reliability confirmed in extended aging tests. This process has been modified for cells having an aluminum zinc oxide layer. In the first cell experiment the efficiency was 0.6% lower than the screen printed reference, because of lower Jsc. This is caused by remaining minor attact on the AZO during processing and optimization of the etch-back solution is ongoing.
Spatial Distribution of City Tweets and Their Densities
Creators: name: Jiang, Bin
name: Ma, Ding
name: Yin, Junjun
name: Sandberg, Mats
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Social media outlets such as Twitter constitute valuable data sources for understanding human activities in the virtual world from a geographic perspective. This paper examines spatial distribution of tweets and densities within cities. The cities refer to natural cities that are automatically aggregated from a country's small street blocks, so called city blocks. We adopted street blocks (rather than census tracts) as the basic geographic units and topological center (rather than geometric center) in order to assess how tweets and densities vary from the center to the peripheral border. We found that, within a city from the center to the periphery, the tweets first increase and then decrease, while the densities decrease in general. These increases and decreases fluctuate dramatically, and differ significantly from those if census tracts are used as the basic geographic units. We also found that the decrease of densities from the center to the periphery is less significant, and even disappears, if an arbitrarily defined city border is adopted. These findings prove that natural cities and their topological centers are better than their counterparts (conventionally defined cities and city centers) for geographic research. Based on this study, we believe that tweet densities can be a good surrogate of population densities. If this belief is proved to be true, social media data could help solve the dispute surrounding exponential or power function of urban population density. Keywords: Big data, natural cities, street blocks, urban density, topological distance
description: 12 pages, 8 figures, 1 table
Graphene-Based Transparent Electrode Incorporated into Silicon Heterojunction Solar Cell Technology
Creators: name: Torres, I.
name: Fernández, S.
name: Gandía, J.J.
name: González Peñalba, N.
name: Barrio Martin, R.
name: De La Cruz, M.
name: Cárabe, J.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Low Temperature Route for Si Cells

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 478-481
description: Silicon heterojunction (SHJ) solar cell technology surely exhibit impressive efficiencies. However, it is often seen examples of devices that are held back by the fill factor (FF). In this work, we present graphene as a viable solution to improve the electrical characteristics of the transparent conductive electrodes based on indium tin oxide (ITO) and thus increase the device’ FF. For this study, single-layer graphene sheets were transferred onto the ITO surface of a SHJ solar cell prior to the metal grid deposition. Simultaneously, graphene sheets were also transferred onto ITO films deposited onto glass substrates for optical and electrical characterization. We show how a single graphene layer has little impact on the optical characteristics of the ITO layer while showing a clear electrical improvement. Applied to a solar cell, the improved electrical properties translates into a 28% reduction to the cell’ series resistance and to a 2.6% improvement in the measured FF, confirming hybrid electrodes based on ITO and graphene as a valid approach to further improve the FF of SHJ solar cells.
title: Charles Soldan docteur en droit juge au tribunal fédéral
title: Discours prononcés sur la tombe de Charles Soldan au cimetière de Montoie, Lausanne le 19 Novembre 1900
titleType: AlternativeTitle
title: né à Lausanne le 20 Mars 1855 : décédé à Lausanne au tribunal fédéral le 16 novembre 1900
titleType: Subtitle
Creators: name: (:Unkn) Unknown
Publisher: name: Zentralbibliothek Zürich
Year: 1900
Subjects: subject: 340 Recht
subject: 920 Biografien, Genealogie, Insignien
subject: Nachruf
subject: Soldan, Charles

description: Enthält: Discours prononcés sur la tombe de Charles Soldan au cimetière de Montole, Lausanne, le 19 Novembre 1900 (Extrait de la „Revue“ du 20 Novembre 1900.); Discours de Monsieur le Dr. E. Rott, Président du Tribunal fédéral; Discours de Monsieur E. Métraux, avocat, Président du Grand Conseil du Canton de Vaud; Discours de Monsieur le prof. Jean Bonnard, Recteur de l’Université de Lausanne; Discours de M. Camille Décoppet, avocad.
Piecewise deterministic Markov processes in biological models
Creators: name: Rudnicki, Ryszard
name: Tyran-Kaminska, Marta
Publisher: name: arXiv
Year: 2015
Subjects: subject: Probability (math.PR)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Mathematics
subject: FOS: Biological sciences

description: We present a short introduction into the framework of piecewise deterministic Markov processes. We illustrate the abstract mathematical setting with a series of examples related to dispersal of biological systems, cell cycle models, gene expression, physiologically structured populations, as well as neural activity. General results concerning asymptotic properties of stochastic semigroups induced by such Markov processes are applied to specific examples.
description: in: Semigroup of Operators - Theory and Applications, J. Banasiak et al. (eds.), Springer Proceedings in Mathematics & Statistics 113, (2015), pp. 235-255
Choerades bella Loodt 1977, comb. n.
Creators: name: Loodt, J. G. H.
Publisher: name: Zenodo
Year: 1977
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Asilidae
Choerades
Choerades bella

description: Choerades bella (Loew, 1858) comb. n. Fig. 2 Laphria bella Loew, 1858 p. 356 (not Oldroyd's 1974 p. 102 Rhodesian records). The identity of C. bella has never been in doubt. Oldroyd (1974) incorrectly labelled a series of C. aureopilosa males from Rhodesia as L. bella (see under C. aureopilosa). The male genitalia (Fig. 2) have not been properly described. Gonopodal setae small, inwardly directed and appear to be fused for only half their length. Distal margin of gonopod extended forming two processes; one being close to the gonopodal setae the other situated more laterally (Fig. 2). Hypandrium long and narrow viewed ventrally. Material examined: SOUTH AFRICA: Transvaal: 4♀ Pietersburg, Malta Forest, G. v. Son, 3.II. l927 (1 ♀;!), 1.1928 (3♀). 1♀ Lydenburg Dist., 1896, P. A. Krantz; vn 'r/ s I ♂, Mac Mac Pools, 20.x1. l975, J. G. H. Londt; I ♂ 1 ♀;!, Louis Trichardt Dist., Entabeni Forest, 1.1975, Stuckenberg; 1 ♂ 1 1 ults(0.49seconds ♂ Female -Wikipedia symbol ♀ The symbo;!, Louis Trichardt Dist., Verakop Forest, 1.1975, Stuckenberg. Natal: 1 ults ♂ 49seconds ♀ Pietermaritzburg, Town Bush X1. l959, B. & P. Stuckenberg; 1 ♀ Pietermaritzburg, Town Bush Valley, X1. 1976, R. M. Miller, ex Malaise Trap. Cape Province: 1 ♀;!, East London, II.XI., 1924, H. K. Munro. TRANSKEl: 1 ♀; Port St Johns, X. l916, H. H. Swinny; 1 ♀; Port St Johns Dist., Coastal Forest, 16- 17. X.1959, B. & P. Stuckenberg; 1 ♀;, Port St Johns, 16.l.1970, B. & P. Stuckenberg. (All specimens in Natal Mus.)
description: Published as part of Loodt, J. G. H., 1977, Afrotropical Asilidae (Diptera) 1. The genus Choerades Walker, 1851 and the descriptions of two new genera, Nannolaphria and Notiolaphria, from southern Africa and Malagasy Republic *, pp. 43-55 in ANNALS OF THE NATAL MUSEUM 23 on page 46, DOI: 10.5281/zenodo.8359775
Laser-induced modification of doped poly-Si surface for Si solar cells with structured passivated contacts
Creators: name: Schäfer, S.
name: Mercker, A.
name: Mertens, V.
name: Neubert, T.
name: Köhler, A.
name: Mettner, L.
name: Brendel, R.
name: Peibst, R.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
High Temperature Route for Si Cells

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 482-486
description: Passivated contacts that use polysilicon on oxide (POLO) show outstanding electrical surface passivation of silicon. However, the parasitic absorption of photons within highly doped poly-Si layer confines its implementation to the rear side silicon solar cells or locally under the front metal contacts. Here, we demonstrate that by irradiating the poly-Si with UV ps-laser pulses, it becomes selectively etch resistant in a KOH solution, due to a laser-induced amorphization of the surface of the poly-Si layer. This poses a low-effort method to structure poly-Si layers with a resolution of the spot size of 25 μm and thus facilitates the implementation as local (front) contacts. We explore the impact of the laser fluence, the gas ambient and the surface morphology (planar and textured) on the surface passivation quality of the so obtained poly-Si layers. The laser-modified and structured poly-Si sample reaches implied open-circuit voltage values of iVoc = 722 mV (planar) and thus the same passivation quality as the non-lasered reference, and iVoc = 680 mV for textured surfaces. A hydrogenation step improves the iVoc of the textured surfaces to 726 mV, which corresponds to a recombination current density of 5 fA/cm2.
Breather solitons in highly nonlocal media
Creators: name: Alberucci, Alessandro
name: Jisha, Chandroth P.
name: Assanto, Gaetano
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We investigate the breathing of optical spatial solitons in highly nonlocal media. Generalizing the Ehrenfest theorem, we demonstrate that oscillations in beam width obey a fourth-order ordinary differential equation. Moreover, in actual highly nonlocal materials, the original accessible soliton model by Snyder and Mitchell [Science \textbf{276}, 1538 (1997)] cannot accurately describe the dynamics of self-confined beams as the transverse size oscillations have a period which not only depends on power but also on the initial width. Modeling the nonlinear response by a Poisson equation driven by the beam intensity we verify the theoretical results against numerical simulations.
description: 7 pages, 4 figures, resubmitted to Physical Review A
Existence of a Not Necessarily Symmetric Matrix with Given Distinct Eigenvalues and Graph
Creators: name: Monfared, Keivan Hassani
Publisher: name: arXiv
Year: 2016
Subjects: subject: Spectral Theory (math.SP)
subject: Combinatorics (math.CO)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 05C50, 15A18, 15A29, 15B57, 65F18

description: For given k distinct complex conjugate pairs, l distinct real numbers, and a given graph G on 2k+l vertices with a matching of size at least k, we will show that there is a real matrix whose eigenvalues are the given numbers and its graph is G. In particular, this implies that any real matrix with distinct eigenvalues is similar to a real, irreducible, tridiagonal matrix.
Unification of Force and Substance
Creators: name: Wilczek, Frank
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: Maxwell's mature presentation of his equations emphasized the unity of electromagnetism and mechanics, subsuming both as "dynamical systems". That intuition of unity has proved both fruitful, as a source of pregnant concepts, and broadly inspiring. A deep aspect of Maxwell's work is its use of redundant potentials, and the associated requirement of gauge symmetry. Those concepts have become central to our present understanding of fundamental physics, but they can appear to be rather formal and esoteric. Here I discuss two things: The physical significance of gauge invariance, in broad terms; and some tantalizing prospects for further unification, building on that concept, that are visible on the horizon today. If those prospects are realized, Maxwell's vision of the unity of field and substance will be brought to a new level.
description: Talk at Royal Society Symposium, "Unifying Physics and Technology in the Light of Maxwell's Equations", November 2015. 26 pages, no figures
Firing-Triggered LID (FT-LID) of the Carrier Lifetime in Cz-Si
Creators: name: Winter, M.
name: Helmich, L.
name: Walter, D.C.
name: Schmidt, J.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 462-467
description: ‘Light-Induced Degradation’ (LID) effects of the carrier lifetime are present in many different silicon materials used in the production of solar cells. In this contribution, we present an approach to separate the boron-oxygen (BO) LID effect observed in boron-doped Czochralski-grown silicon (Cz-Si) from an additional firing-triggered LID (FT-LID) effect. We perform BO degradation/deactivation cycles by alternating illumination and dark annealing (DA) steps at 200 °C, while recording the changes in the carrier lifetime. Our measurements show that – despite some similarities – the observed FT-LID effect in Cz-Si is different to the ‘Light and elevated Temperature Induced Degradation’ (LeTID) effect reported on multicrystalline silicon (mc-Si) materials. In particular, the time constants of the lifetime degradation differs by at least a factor of 10 under the same experimental conditions. In addition, experiments where multiple alternating light degradation, regeneration and DA steps were performed show a different behavior between FTLID in Cz-Si and LeTID in mc-Si. Although FT-LID as well as LeTID are both triggered by fast-firing, which makes it very likely that hydrogen participates in both defect reactions, the detailed defect physics seems to be different.
Limitations of the Growth Rate of Silicon Mono Ingots Grown by the Czochralski Technique
Creators: name: Mosel, F.
name: Denisov, A.V.
name: Klipp, B.
name: Sennova, N.
name: Kranert, C.
name: Jung, T.
name: Trempa, M.
name: Reimann, C.
name: Friedrich, J.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 468-473
description: In the PV industry, cost pressure subsists in the entire production chain of PV modules, affecting the further development of high-performance cell concepts and the manufacture of suitable high quality substrate crystals. The improvement of the quality of monocrystalline silicon ingots, grown by the Czochralski technique, while increasing productivity and reducing crystallization costs, is a major challenge. The reductions in production costs can be achieved by increasing growth rate and melt volumes. Both options were shown at EUPVSEC 2016 [1]. In this contribution we have investigated the basic limitations of the pull rate in the Czochralski process. As part of our investigations we have grown several crystals beyond the pulling speed limit resulting in a loss of the cylindrical shape of the ingot, often described as twisting or spiral growth. We performed these crystal growth experiments in various crystal growing configurations using different process parameters. We have analyzed the boundary conditions by means of numerical simulation calculations and compared the results with the crystal growth experiments. From this, we have derived diagrams that allow an estimation of the pull rate limit for the different growth conditions. We have found a simple relationship between the growth rate and the deflection of the phase boundary allowing the growth conditions to be assessed in terms of the stability criteria mentioned above. We show that by the application of an active crystal cooler during the growth process in combination with a suitable inner heat shield the deflection of the growth interface can be influenced. This fact can be used to realize a higher pull speed and to influence the material quality of the growing crystal.
Star formation activity in the neighbourhood of W-R 1503-160L star in the mid-infrared bubble N46
Creators: name: Dewangan, L. K.
name: Baug, T.
name: Ojha, D. K.
name: Janardhan, P.
name: Ninan, J. P.
name: Luna, A.
name: Zinchenko, I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In order to investigate star formation (SF) processes in extreme environments, we have carried out a multi-wavelength analysis of the mid-infrared bubble N46, which hosts a WN7 Wolf-Rayet (W-R) star. We have used 13CO line data to trace an expanding shell surrounding the W-R star containing about five condensations within the molecular cloud associated with the bubble. The W-R star is associated with a powerful stellar wind having a mechanical luminosity of ~4 x 10^37 ergs/s. A deviation of the H-band starlight mean polarization angles around the bubble has also been traced, indicating the impact of stellar wind on the surroundings. The Herschel temperature map shows a temperature range of ~18 - 24 K toward the five molecular condensations. The photometric analysis reveals that these condensations are associated with the identified clusters of young stellar objects, revealing ongoing SF process. The densest among these five condensations (peak N(H_2) ~9.2 x 10^22 cm^-2 and A_V ~ 98 mag) is associated with a 6.7 GHz methanol maser, an infrared dark cloud, and the CO outflow, tracing active massive SF within it. At least five compact radio sources (crss) are physically linked with the edges of the bubble and each of them is consistent with the radio spectral class of a B0V - B0.5V type star. The ages of the individual infrared counterparts of three crss (~1 - 2 Myr) and a typical age of WN7 W-R star (~4 Myr) indicate that the SF activities around the bubble are influenced by the feedback of the W-R star.
description: 22 pages, 12 figures, 3 tables, Accepted for publication in The Astrophysical Journal
Choerades flavipes, comb. n.
Creators: name: Loodt, J. G. H.
Publisher: name: Zenodo
Year: 1977
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Asilidae
Choerades
Choerades flavipes

description: Choerades flavipes (Weidemann, 1821) comb. n. Fig. 3 Laphria flavipes Weidemann, 1821 pp. 238-9 (not Oldroyd's 1974 p. 102 South Africa (Tongaat), Mozambique and Rhodesia records). ? Dasythrix nigrapex Bigot, 1878 p. 229. C. jlavipes was described from a female specimen from ·Prom. bon. sp.' (probably Table Mountain, Cape Town) and as my records show the species to be confined to the Cape Province from the Cape Peninsula to the eastern Cape Province I have little doubt that males subsequently identified as C. jlavipes are truly the males of this species. Oldroyd (1974) places Dasythrix nigrapex Bigot in his list of synonymy but since the type locality of this species is in Natal there is a strong possibility that this species is not the same as C. jlavipes. I have not seen Bigot's material; if D. nigrapex is indeed a Choerades there is the. possibility that it is C. aureopilosa in which case Bigot's name will have precedence over that of Ricardo. The male terminalia (Fig. 3) of C. jlavipes are illustrated for comparison with other species. Fused gonopodal setae (4 or 5 in number) are short and inwardly directed. Two groups of well-developed setae lie posteriorly of the gonopodaJ setae. The first group contains two setae the second group four. Material examined: SOUTH AFRICA: Cape Province: 1 ♂, Cape Town; 1 ♂, Muizenberg, 27.X.1934, G. v. Son; 1 ♂, Montagu Pass, 20.1.1922, Dr Brauns; 1 ♀;!, Knysna, 1.1.1910, Dr Brauns; 1♀ George, 10.X 1.1912, Dr Brauns; 1♂ Knysna Forest, 1911, Miss Rex; 1♀ Uniondale, 25.XII.1909, Dr Brauns; 1♀ Mossel Bay, XI1.1934, R. E. Turner; 1♀Karreedouw Mountains, W. of Humansdorp, 14.X.1959, B. & P. Stuckenberg; 2♂ Storms River Pass, Tsitsikama Area, 8.XII.1967, B. & P. Stuckenberg; 1♂ Van Staden's River, 1924, Dr Brauns; 1♂ Willowmore, 1.1908, Dr Brauns; 1♂ Cradock, 28.XI. l968, J. G. H. Londt. (All specimens in Natal Mus.)
description: Published as part of Loodt, J. G. H., 1977, Afrotropical Asilidae (Diptera) 1. The genus Choerades Walker, 1851 and the descriptions of two new genera, Nannolaphria and Notiolaphria, from southern Africa and Malagasy Republic *, pp. 43-55 in ANNALS OF THE NATAL MUSEUM 23 on page 46, DOI: 10.5281/zenodo.8359775
Cavity-induced chiral states of fermionic quantum gases
Creators: name: Sheikhan, Ameneh
name: Brennecke, Ferdinand
name: Kollath, Corinna
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate ultra-cold fermions placed into an optical cavity and subjected to optical lattices which confine the atoms to ladder structures. A transverse running-wave laser beam induces together with the dynamical cavity field a two-photon Raman-assisted tunneling process with spatially dependent phase imprint along the rungs of the ladders. We identify the steady states which can occur by the feedback mechanism between the cavity field and the atoms. We find the spontaneous emergence of a finite cavity field amplitude which leads to an artificial magnetic field felt by the fermionic atoms. These form a chiral insulating or chiral liquid state carrying a chiral current. We explore the rich state diagram as a function of the power of the transverse laser beam, the atomic filling, and the phase imprint during the cavity-induced tunneling. Both a sudden onset or a slow exponential activation with the transverse laser power of the self-organized chiral states can occur.
CoREAS simulations of inclined air showers predict refractive displacement of the radio-emission footprint
Creators: name: Gottowik, Marvin
name: Schlüter, Felix
name: Huege, Tim
name: Rautenberg, Julian
Publisher: name: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Year: 2022

description: Simulating the radio emission of inclined extensive air showers for a ground-based radio-antenna array we find a systematic displacement of the radio emission with respect to the Monte-Carlo shower impact point. We correct the radio-emission footprint for the asymmetries due to the superposition of geomagnetic and charge-excess radiation as well as for the early-late effect. The remaining displacement is found to be ∼1500 m along the ground plane for showers with a zenith angle of 85°, which is relevant for air shower detectors. A model describing this displacement by refraction in the atmosphere based on Snell’s law yields good agreement with our observations from CoREAS simulations. We thus conclude that the displacement is caused by refraction in the atmosphere.
Choerades multipunctata Loodt 1977, comb. n.
Creators: name: Loodt, J. G. H.
Publisher: name: Zenodo
Year: 1977
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Asilidae
Choerades
Choerades multipunctata

description: Choerades multipunctata (Oldroyd, 1974) comb. n. Laphria multipunctata Oldroyd, 1974 p. 102. I have seen a single female specimen of this distinctive species. The type, from Matjiesfontein, sex not stated by Oldroyd, has not been studied. Material examined: SOUTH AFRICA: Cape Province: 1♀ Seven Weeks Poort 17.XI. I 940, G. v. Son (Natal Mus.)
description: Published as part of Loodt, J. G. H., 1977, Afrotropical Asilidae (Diptera) 1. The genus Choerades Walker, 1851 and the descriptions of two new genera, Nannolaphria and Notiolaphria, from southern Africa and Malagasy Republic *, pp. 43-55 in ANNALS OF THE NATAL MUSEUM 23 on page 47, DOI: 10.5281/zenodo.8359775
Interference at the tunnel ionization from double-center potential
Creators: name: Golovinski, P. A.
name: Drobyshev, A. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The tunnel ionization of an electron bounded by two delta potentials under the influence of a constant electric field is considered. The equations for the electron current density for two different initial states are obtained. The dependence of the emission current on the orientation of the potential with respect to the field direction and the distance between them is studied. Appropriate conditions for observation essential interference effects are defined.
description: 7 pages, 2 figures
Evaluation of Heterojunction Solar Cell Losses due to Half-Cell Processes
Creators: name: Turek, M.
name: Breitenstein, O.
name: Eiternick, S.
name: Bharatula, S.
name: Großer, S.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Low Temperature Route for Si Cells

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 474-477
description: Half-cell modules are a preferred technological option to produce high efficiency photovoltaic modules. In this work, we present results on different half-cell processes applied to state-of-the-art heterojunction solar cells. We show that for heterojunction solar cells, a well optimized cell separation process is necessary for reduced losses at the half-cell edge. The cell separation leads to additional depletion region recombination currents, which can be imaged and quantified by dark lock-in thermography (DLIT). To this end, we present a ‘Local I-V’ analysis that quantifies local electrical losses for different half-cell processes.
Stellar models simulating the disk-locking mechanism and the evolutionary history of the Orion Nebula cluster and NGC2264
Creators: name: Landin, N. R.
name: Mendes, L. T. S.
name: Vaz, L. P. R.
name: Alencar, S. H. P.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Rotational evolution in young stars is described by pMS evolutionary tracks including rotation, conservation of angular momentum (AM), and simulations of disk-locking (DL). By assuming that DL is the regulation mechanism for the stellar angular velocity during the early stages of pMS, we use our models and observational data to constrain disk lifetimes (Tdisk) of a sample of low-mass stars in the ONC and NGC2264. The period distributions of the ONC and NGC2264 are bimodal and depend on the stellar mass. To follow the rotational evolution of these two clusters' stars, we generated some sets of evolutionary tracks. We assumed that the evolution of fast rotators can be modeled by considering conservation of AM during all stages and of moderate rotators by considering conservation of angular velocity during the first stages of evolution. With these models we estimate a mass and an age for all stars. For the ONC, we assume that the secondary peak in the period distribution is due to high-mass objects locked in their disks, with a locking period (Plock) of ~8 days. For NGC2264 we make two hypotheses: (1) the stars in the secondary peak are locked with Plock=5 days, and (2) NGC2264 is in a later stage in the rotational evolution (this implies in a DL scenario with Plock=8 days, a Tdisk of 1 Myr and, after that, constant AM evolution). We simulated the period distribution of NGC2264 when its mean age was 1 Myr. Dichotomy and bimodality appear in the simulated distribution, presenting one peak at 2 days and another one at 5-7 days, indicating that the assumption of Plock=8 days is plausible. Our hypotheses are compared with observational disk diagnoses available in the literature. DL models with Plock=8 days and 0.2 Myr<=Tdisk<=3 Myr are consistent with observed periods of moderate rotators of the ONC. For NGC2264, hyphotesis 2 is the more promising explanation for its period distribution.
description: 20 pages and 24 figures
Letter from Kathleen Raine to Robin Skelton, November 07, [1970?]
Creators: name: Raine, Kathleen, 1908-2003
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Skelton, Robin
valueUri: http://id.worldcat.org/fast/51853
subject: Periodical editors
valueUri: http://id.worldcat.org/fast/1058064
subject: Novelists
valueUri: http://id.worldcat.org/fast/1039684
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Editors
valueUri: http://id.worldcat.org/fast/902475
subject: Scholars
valueUri: http://id.worldcat.org/fast/1106878
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Critics
valueUri: http://id.worldcat.org/fast/883769
subject: Novelists, English
valueUri: http://id.worldcat.org/fast/1039718
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Raine, Kathleen, 1908-2003
valueUri: http://id.worldcat.org/fast/52672
subject: Wiccans
valueUri: http://id.worldcat.org/fast/1765210
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870

description: Part of a collection of correspondence to Robin Skelton from British critic and poet Kathleen Raine. In several of the letters Raine discusses the Temenos magazine, of which she was a founder. In this letter Raine shares the news of a friend's passing.
Early Stage Quality Assessment in Silicon Ingots from MDP Brick Characterization
Creators: name: Kovvali, A.S.
name: Demant, M.
name: Rebba, B.
name: Schüler, N.
name: Haunschild, J.
name: Rein, S.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 452-458
description: Feedback on the material quality of silicon ingots is highly beneficial in the photovoltaic production chain. It is crucial for crystal growers to improve the quality and optimize the crystallization process. Moreover, for solar cell manufacturers, knowing the quality beforehand helps to sort out the bad quality material thereby reducing the costs and enhancing the total yield. Therefore, rating material quality already on the brick level is highly valuable for the effective optimization of the value chain in both directions. In this paper, we propose a method to classify the silicon bricks based on their electrical quality. Due to our comprehensive data set and feature detection, the model is capable to predict the quality of even edge and corner bricks of the ingot. We introduce a novel feature extraction method to quantify quality-related features from spatially-resolved microwave-detected photoconductivity (MDP) brick measurements. Further, a machine-learning-based prediction model is developed to predict the open-circuit voltage (Voc) of solar cells from these features. A comparative analysis for brick quality estimation for inner and outer bricks of high-performance multi (HPM) and cast-mono (CM) silicon bricks is provided. The best mean absolute error in prediction achieved for HPM and CM materials is 3.1 mV and 4.8 mV, respectively.
Effective Lifetime Variations Significant for Process Evaluation or Just an Artifact of Wafer Size and Quality? – An Attempt to Quantify Material Induced Variations
Creators: name: Fischer, C.
name: Schmid, A.
name: Zuschlag, A.
name: Hahn, G.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 459-461
description: Small sample size and usage of sister wafers in photovoltaics research are quite common. Regarding sample size, edge effects and reduced thermal mass may influence applicability of scientific findings to industrial wafers. Therefore, an extended investigation of these effects performed on various Si materials for solar cells can help to evaluate possible drawbacks of small-sized research samples. In addition to problems with inversion-based passivation mechanisms, edge recombination effects can significantly reduce lifetimes. These effects are more detrimental for small-sized samples due to a higher edge-to-area ratio. Furthermore, a comparison of sister wafers including their degradation and regeneration behavior should help to quantify the uncertainty due to wafer quality variations. Comparable lifetimes without significant variations are shown with annealed sister wafers. However, fired p-type Cz-Si sister wafers are prone to BO and LeTID degradation. Therefore, differing initial lifetimes can be explained by different states of degradation at the start of investigation. Normalized defect densities show comparable maxima referring to regenerated lifetimes.
Methodology to Determine Bulk Crystal Quality in Terms of Carrier Lifetime without Wafering
Creators: name: Müller, M.
name: Weber, A.
name: Kropp, A.I.
name: Ehrl, M.
name: Urban, T.
name: Häussermann, P.
name: Neubert, B.
name: Albrecht, A.
name: Seidel, S.
name: Otto, R.
name: Dadzis, K.
name: Menzel, R.
name: Trempa, M.
name: Kranert, C.
name: Reimann, C.
name: Heitmann, J.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 449-451
description: A methodology is proposed to evaluate bulk silicon crystal quality without wafering, which supports the development and optimization of crystal growth techniques. A process sequence is developed to passivate thick slices from silicon crystals as well as silicon wafers. It consists of saw-damage removal, a RCA clean, an atomic layer deposited Al2O3 and annealing. Samples with dimensions in the range of 30 – 163 mm length and width, and 0.1 – 2.0 mm thickness can be processed. The methodology is successfully applied to evaluate the bulk carrier lifetime for potential estimations of advanced crystallization techniques and the determination of local interstitial iron, e.g. due to crucible in-diffusion.
Switching the magnetization of magnetostrictive nanomagnets from single-domain to non-volatile vortex states with a surface acoustic wave
Creators: name: Sampath, Vimal
name: ďSouza, Noel
name: Bhattacharya, Dhritiman
name: Atkinson, Gary M.
name: Bandyopadhyay, Supriyo
name: Atulasimha, Jayasimha
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: We report manipulation of the magnetic states of elliptical cobalt magnetostrictive nanomagnets (of nominal dimensions ~ 340 nm x 270 nm x 12 nm) delineated on bulk 128° Y-cut lithium niobate with Surface Acoustic Waves (SAWs) launched from interdigitated electrodes. Isolated nanomagnets that are initially magnetized to a single domain state with magnetization pointing along the major axis of the ellipse are driven into a vortex state by surface acoustic waves that modulate the stress anisotropy of these nanomagnets. The nanomagnets remain in the vortex state until they are reset by a strong magnetic field to the initial single domain state, making the vortex state non-volatile. This phenomenon is modeled and explained using a micromagnetic framework and could lead to the development of extremely energy efficient magnetization switching methodologies.
Kerfless Wafering Approach with Si and Ge Templates for Si, Ge and III-V Epitaxy
Creators: name: Weiss, C.
name: Schreiber, W.
name: Drießen, M.
name: Sorgenfrei, R.
name: Liu, T.
name: Ohnemus, M.
name: Janz, S.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 444-448
description: We work on the transfer from CZ wafers to epitaxially grown Si and Ge wafers on reusable substrates with a porous detachment layer (“kerfless wafering”) to reduce material and energy consumption. We report on our progress of applying the kerfless wafering approach to Si and to Ge wafers. For Si, we develop templates and epitaxially grown wafers (SiEpiWafers) since many years in our self-made CVD reactor (“RTCVD”) and are now bringing their quality to the next level with a new, microelectronic CVD reactor (“PEpi”) which allows us to grow 6” and 156x156 mm² (M0) epitaxial Si wafers with adjustable thickness and doping level (n- and p-type). In the first test runs, we achieved as-grown lifetimes up to 840 µs and a total thickness variation of ~ 10%. For Ge, we were successful in developing and understanding a porous layer stack leading to 4” detachable Ge templates for future Ge or III-V epitaxial growth.
Choerades nigrescens Loodt 1977, comb. n.
Creators: name: Loodt, J. G. H.
Publisher: name: Zenodo
Year: 1977
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Asilidae
Choerades
Choerades nigrescens

description: Choerades nigrescens (Ricardo, 1925) comb. n. Fig. 4 Laphria nigrescens Ricardo, 1925 pp. 279-80 This distinctive species was originally described from Malawi. The male terminalia (Fig. 4) have not been adequately described before. Fused gonopodal setae (4 in each group) short, straight and inwardly directed. Inner setae shorter than outer setae giving the fused group a characteristic shape (Fig. 4). Distal processes of gonopods blunt and inwardly directed. Material examined: MOZAMBIQUE: 1♀ Marromeu, Lower Zambezi River, Salone Forest, XII. 1959, Stuckenberg (Natal Mus.). SOUTH AFRICA: Natal: 1♂ 1♀ Manguzi River, near Maputa, XI-XII. 1945, H. W. Bell Marley (Durban Mus.); 3♀ 16 km. N. Josini, X1. I971, M. E. & B. J. Irwin, dry forest, 246 m elevation (Natal Mus.)
description: Published as part of Loodt, J. G. H., 1977, Afrotropical Asilidae (Diptera) 1. The genus Choerades Walker, 1851 and the descriptions of two new genera, Nannolaphria and Notiolaphria, from southern Africa and Malagasy Republic *, pp. 43-55 in ANNALS OF THE NATAL MUSEUM 23 on page 47, DOI: 10.5281/zenodo.8359775
Effect of X-Y Translation Table Speeds to the Optical Absorption of Silicon Solar Cells Textured by Pulsed Nd:YAG Laser
Creators: name: Abdul Razak, N.H.
name: Sopian, K.
name: Amin, N.
name: Akhtaruzzaman, M.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Manufacturing & Production of Si Cells

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 437-440
description: Silicon has a capability to trap photons from the incident light and penetrate it into the cells. However, silicon is known as a poor absorber because it is semiconductor material that has indirect bandgap of about 1.12 eV. For photovoltaic application, silicon wafer surfaces must be textured first to trap more photons from the incident light. Generally, wet chemical technique is used to texture silicon wafer surfaces. However, due to the pollution caused by chemical waste, several techniques has been discovered as an alternative techniques to replace the wet chemical technique. One of the alternative techniques to textured silicon wafer surfaces is Pulsed Nd:YAG laser. In this paper, X-Y translation table speeds of Pulsed Nd:YAG laser plays an important role in order to increase the silicon wafer incident light absorption. Results from UV-Vis Spectrophotometer shown that the absorption of the silicon wafer increase from 0.5 to 1.5 at solar spectrum AM1.5. The highest absorption occur when the X-Y translation table is moving at 0.5 mm/s speed compared to the speed 50 mm/s where the absorption is lower. This is because silicon surface has a fully textured compared to the less textured surfaces, respectively.
Choerades serpentina Loodt 1977, comb. n.
Creators: name: Loodt, J. G. H.
Publisher: name: Zenodo
Year: 1977
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Asilidae
Choerades
Choerades serpentina

description: Choerades serpentina (Bezzi, 1908) comb. n. Fig. 5 Laphria serpentina Bezzi, [908 p. 378 Oldroyd (1974) doubtfully assigned specimens from Malawi, Mozambique and South Africa to this species. I here present an illustration of the male genital bulb drawn from the only specimen available to me (Fig. 5). Fused gonopodal setae curved in an S-like manner with distal points pointing outwards. Aedeagal structure very well developed and extended posteriorly. The male terminalia of the specimen studied are quite distinctive and there should be no trouble recognizing this species. A comparison with the type specimens should reveal whether southern African specimens are indeed C. serpentina. Material examined: SOUTH AFRICA: Natal: 1 ♂, Dukuduku, 22-24.1 II. 1968, Potgieter & Goode (Natal Mus.)
description: Published as part of Loodt, J. G. H., 1977, Afrotropical Asilidae (Diptera) 1. The genus Choerades Walker, 1851 and the descriptions of two new genera, Nannolaphria and Notiolaphria, from southern Africa and Malagasy Republic *, pp. 43-55 in ANNALS OF THE NATAL MUSEUM 23 on page 47, DOI: 10.5281/zenodo.8359775
Crystalline Silicon Synthesis by Magnesiothermic Reduction of Natural Silica Sand
Creators: name: Darghouth, A.
name: Aouida, S.
name: Bessais, B.
Publisher: name: WIP
Year: 2020
Subjects: Silicon Materials and Cells
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 37th European Photovoltaic Solar Energy Conference and Exhibition; 441-443
description: Crystalline metallurgical silicon powder was successfully produced from natural silica sand by magnesiothermic reduction. Silica sand was first transformed into silica powder which was reduced by magnesium granules at different temperatures. X-ray diffraction (XRD) shows that the produced mixture is the result of a rather complex reaction leading to the formation of Si and other by-products such as MgO and Mg2Si. The removal of these by-products leads to the synthesis of crystalline silicon. The Fourier Infrared Spectroscopy spectrum of the final product exhibits a bulk Si-Si stretching vibrational mode at around 620 cm-1. Both XRD and FTIR investigations show that pure crystalline silicon powder can be easily produced at low energy cost from an abundant local and lowcost raw material.