cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Beiträge zur Vitrellenfauna Württembergs IV
Creators: name: Geyer, David
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 63, 1907
Simple Model for the Calculation of Wire Tension Forces in the Multi Wire Sawing Process
Creators: name: Sunder, K.
name: Rataj, R.
name: Anspach, O.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 541-548
description: The wire tension force is fundamental for the multi wire sawing process with both slurry and diamond wire. It impacts the force between cutting particles and work piece and therewith the wire bow, which again affects the wafer quality. The wire tension force can be altered by all parameters that affect the wire’s length and diameter. These are for instance fluctuations of the wire guiding roller groove depth or radii, missing parallelism of the wire guiding rollers, a change of wire bow, plastic wire elongation and wire wear. The possibilities are manifold and tend to change during a cut with position and time. As a consequence an iterative calculation is introduced to follow the changes of wire tension force along the wire web and to enable therewith an understanding which of the mentioned factors is relevant, how they affect each other and how they develop with time.
Investigation on Different Surface Modifications Using Laser Texturing
Creators: name: Radfar, B.
name: Es, F.
name: Turan, R.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Homojunction Solar Cells

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 706-709
description: One of the important factors that determines the performance of a crystalline silicon solar cell is the surface structuring. Surface not only affects the electrical properties with recombination but also the optical properties via light trapping. To minimize reflection from the flat surface and improve light trapping, the crystalline silicon wafers must be textured. For monocrystalline Si cells, anisotropic alkaline etchants are commonly used to create pyramids on the surface. However, this method is not suitable for multi-crystalline Silicon due to grains of random crystallographic orientation. The aim of this study is to employ laser texturing which is an anisotropic texturing process as an alternative method for texturing multi-c solar cells. The approach utilizes a laser to create pits on the surface of multi-crystalline silicon wafers. The laser processing parameters are justified by performing series of experiments for different values of processing parameters. In order to determine the effectiveness of the process, the reflectance and Scanning Electron Microscopy (SEM) images of produced textures are taken into account. As a result, proper parameters for laser and laser motor is founded. The SEM images show that textures are deep enough to trap light inside and the reflection measurements indicate that samples have a low reflection.
Signal Reception With Generic Three-State Receptors in Synaptic MC
Creators: name: Lotter, Sebastian
name: Barros, Michael T.
name: Schober, Robert
name: Schäfer, Maximilian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Emerging Technologies (cs.ET)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Synaptic communication is studied by communication engineers for two main reasons. One is to enable novel neuroengineering applications that require interfacing with neurons. The other reason is to draw inspiration for the design of synthetic molecular communication systems. Both of these goals require understanding of how the chemical synaptic signal is sensed and transduced at the synaptic receiver (Rx). While signal reception in synaptic molecular communication (SMC) depends heavily on the kinetics of the receptors employed by the synaptic Rxs, existing channel models for SMC either oversimplify the receptor kinetics or employ complex, high-dimensional kinetic schemes limited to specific types of receptors. Both approaches do not facilitate a comparative analysis of different types of natural synapses. In this paper, we propose a novel deterministic channel model for SMC which employs a generic three-state receptor model that captures the characteristics of the most important receptor types in SMC. The model is based on a transfer function expansion of Fick's diffusion equation and accounts for release, diffusion, and degradation of neurotransmitters as well as their reversible binding to finitely many generic postsynaptic receptors. The proposed SMC model is the first that allows studying the impact of the characteristic dynamics of the main postsynaptic receptor types on synaptic signal transmission. Numerical results indicate that the proposed model indeed exhibits a wide range of biologically plausible dynamics when specialized to specific natural receptor types.
description: 6 pages, 6 figures. Presented at 2022 IEEE Global Communications Conference (GLOBECOM), Rio de Janeiro, Brasil
Counterexamples to the extendibility of positive unital norm-one maps
Creators: name: Chiribella, Giulio
name: Davidson, Kenneth R.
name: Paulsen, Vern I.
name: Rahaman, Mizanur
Publisher: name: arXiv
Year: 2022
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Arveson's extension theorem guarantees that every completely positive map defined on an operator system can be extended to a completely positive map defined on the whole C*-algebra containing it. An analogous statement where complete positivity is replaced by positivity is known to be false. A natural question is whether extendibility could still hold for positive maps satisfying stronger conditions, such as being unital and norm 1. Here we provide three counterexamples showing that positive norm-one unital maps defined on an operator subsystem of a matrix algebra cannot be extended to a positive map on the full matrix algebra. The first counterexample is an unextendible positive unital map with unit norm, the second counterexample is an unextendible positive unital isometry on a real operator space, and the third counterexample is an unextendible positive unital isometry on a complex operator space.
description: Comments are welcome
A general holographic insulator/superconductor model away from the probe limit
Creators: name: Peng, Yan
name: Pan, Qiyuan
name: Liu, Yunqi
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate holographic phase transitions affected by dark matter sector in the AdS soliton background away from the probe limit. When neglecting backreaction, the scalar charge q can be scaled unity without loss of generality. While considering backreaction in this work, we obtain much more richer physics by choosing various scalar charge q. Firstly, we observe unstable retrograde condensation appears due to the dark matter sector and also derive stable conditions. For stable solutions, we find that the larger coupling parameter $α$ makes the gap of condensation shallower and the critical chemical potential keeps as a constant with a large scalar charge q, which is similar to cases in the probe limit. In contrast, the dark matter sector could affect the critical chemical potential and the order of phase transitions for very small charge q. We also arrive at the same conclusion from the holographic topological entanglement entropy approach. Moreover, we state that the entanglement entropy approach is especially powerful in studying the effects of the dark matter sector in this general insulator/superconductor system.
description: 18 pages, 8 figures. arXiv admin note: text overlap with arXiv:1507.07399
Alttertiäre Land- und Süsswasserschnecken der Ulmer Gegend
Creators: name: Miller, Konrad
Publisher: name: unkn
Year: 2021

description: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart
description: Bd. 63, 1907
Bifacial p-Type Silicon PERL Solar Cells with Screen-Printed Pure Silver Metallization and 89% Bifaciality
Creators: name: Lohmüller, E.
name: Werner, S.
name: Norouzi, M.H.
name: Mack, S.
name: Demant, M.
name: Gutscher, S.
name: Saint-Cast, P.
name: Wasmer, S.
name: Wöhrle, N.
name: Bitnar, B.
name: Steckemetz, S.
name: Palinginis, P.
name: Neuhaus, H.
name: König, M.
name: Wolf, A.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Homojunction Solar Cells

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 418-423
description: We present 6-inch bifacial p-type Czochralski-grown silicon passivated emitter and rear locally-diffused
(PERL) solar cells with “pPassDop” layer stack on the cell’s rear side. The “pPassDop” layer stack consists of an aluminum
oxide and a boron-doped silicon nitride layer serving as both surface passivation and doping source. Local
laser processing introduces boron and aluminum atoms from the “pPassDop” layer stack into the silicon. The electrical
contacting of the formed line-shaped p-doped back surface field is realized by screen-printed and fired pure silver
contacts (i.e. without aluminum). The fabricated PERL solar cells reach high bifaciality of up to 89%. The monofacial
peak front side energy conversion efficiency, measured with contact bars on both sides on a black non-conducting
chuck, is given by 19.8%. Fill factors of more than 79% and specific contact resistances in the single-digit mΩcm²-
range prove the successful low-resistance contacting on both sides. It is important to stress that the same commercial
state-of-the-art firing-through pure silver screen-printing paste is used for the cell’s front and rear side metallization.
A special alignment procedure ensures that the rear silver grid with finger widths of about 65 μm is placed over the
whole wafer on top of the about 37 μm-wide laser-doped and opened structures.
Recent Advances in Asymptotic Analysis
Creators: name: Wong, R.
name: Zhao, Yu-Qiu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 41-02, 41A60, 39A06, 45A05, 45E10

description: This is a survey article on an old topic in classical analysis. We present some new developments in asymptotics in the last fifty years. We start with the classical method of Darboux and its generalizations, including an uniformity treatment which has a direct application to the Heisenberg polynomials. We then present the development of an asymptotic theory for difference equations, which is a major advancement since the work of Birkhoff and Trjitzinsky in 1933. A new method was introduced into this field in the nineteen nineties, which is now known as the nonlinear steepest descent method or the Riemann-Hilbert approach. The advantage of this method is that it can be applied to orthogonal polynomials which do not satisfy any differential or difference equations neither do they have any integral representations. As an example, we mention the case of orthogonal polynomials with respect to the Freud weight. Finally, we show how the Wiener-Hopf technique can be used to derive asymptotic expansions for the solutions of an integral equation on a half line.
description: 46 pages
Study of Impurities Diffusion in Silicon Liquid Phase in Conditions of High Turbulence of Melt
Creators: name: Karabanov, S.M.
name: Suvorov, D.V.
name: Belyakov, O.A.
name: Karabanov, A.S.
name: Tarabrin, D.Y.
name: Slivkin, E.V.
name: Dshkhunyan, V.L.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 501-504
description: The paper presents the research results of impurity diffusion to silicon melt surface under different
conditions to determine optimal purification conditions of silicon for solar cells. The dependences of the impurity flow
(B, P, Al, Fe) across the silicon melt boundary on the average radial flow rate on the melt surface are determined. It has
been established that, beginning with the average radial flow rate of 0.1 m/s on the melt surface, the intensity of the
impurity flow from the melt surface increases sharply. Obviously, it is connected with the transfer to turbulent melt flow
conditions. The research is carried out by mathematical modeling using COMSOL Multiphysics and Matlab software.
Existence and asymptotic behavior of normalized ground states for Sobolev critical Schrödinger systems
Creators: name: Bartsch, Thomas
name: Li, Houwang
name: Zou, Wenming
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: The paper is concerned with the existence and asymptotic properties of normalized ground states of the following nonlinear Schrödinger system with critical exponent: \begin{equation*} \left\{\begin{aligned} &-δu+λ_1 u=|u|^{2^*-2}u+{να} |u|^{α-2}|v|^βu,\quad \text{in }\mathbb{R}^N, &-δv+λ_2 v=|v|^{2^*-2}v+{νβ} |u|^α|v|^{β-2}v,\quad \text{in }\mathbb{R}^N, &\int u^2=a^2,\;\;\; \int v^2=b^2, \end{aligned} \right. \end{equation*} where $N=3,4$, $α,β>1$, $2<α+β<2^*=\frac{2N}{N-2}$. We prove that a normalized ground state does not exist for $ν<0$. When $ν>0$ and $α+β\le 2+\frac{4}{N}$, we show that the system has a normalized ground state solution for $0<ν<ν_0$, the constant $ν_0$ will be explicitly given. In the case $α+β>2+\frac{4}{N}$ we prove the existence of a threshold $ν_1\ge 0$ such that a normalized ground state solution exists for $ν>ν_1$, and does not exist for $ν<ν_1$. We also give conditions for $ν_1=0$. Finally we obtain the asymptotic behavior of the minimizers as $ν\to0^+$ or $ν\to+\infty$.
Dynamic Modularity Approach to Adaptive Inner/Outer Loop Control of Robotic Systems
Creators: name: Wang, Hanlei
name: Ren, Wei
name: Cheah, Chien Chern
name: Xie, Yongchun
name: Lyu, Shangke
Publisher: name: arXiv
Year: 2016
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Modern applications of robotics typically involve a robot control system with an inner PI (proportional-integral) or PID (proportional-integral-derivative) control loop and an outer user-specified control loop. The existing outer loop controllers, however, do not take into consideration the dynamic effects of robots and their effectiveness relies on the ad hoc assumption that the inner PI or PID control loop is fast enough, and other torque-based control algorithms cannot be implemented in robotics with closed architecture. This paper investigates the adaptive control of robotic systems with an inner/outer loop structure, taking into full account the effects of the dynamics and the system uncertainties, and both the task-space control and joint-space control are considered. We propose a dynamic modularity approach to resolve this issue, and a class of adaptive outer loop control schemes is proposed and their role is to dynamically generate the joint velocity (or position) command for the low-level joint servoing loop. Without relying on the ad hoc assumption that the joint servoing is fast enough or the modification of the low-level joint controller structure, we rigorously show that the proposed outer loop controllers can ensure the stability and convergence of the closed-loop system. We also propose the outer loop versions of several standard joint-space direct/composite adaptive controllers for rigid or flexible-joint robots, and a promising conclusion may be that most torque-based adaptive controllers for robots can be designed to fit the inner/outer loop structure by using the new definition of the joint velocity (or position) command. Simulation results are provided to show the performance of various adaptive outer loop controllers, using a three-DOF (degree-of-freedom) manipulator, and experiment results using the UR10 robotic system are also presented.
description: This version is mainly for including the experimental results
Bayesian operator inference for data-driven reduced-order modeling
Creators: name: Guo, Mengwu
name: McQuarrie, Shane A.
name: Willcox, Karen E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Computation (stat.CO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: J.2
subject: 62F15, 65M32, 35F20, 35R30, 80A25

description: This work proposes a Bayesian inference method for the reduced-order modeling of time-dependent systems. Informed by the structure of the governing equations, the task of learning a reduced-order model from data is posed as a Bayesian inverse problem with Gaussian prior and likelihood. The resulting posterior distribution characterizes the operators defining the reduced-order model, hence the predictions subsequently issued by the reduced-order model are endowed with uncertainty. The statistical moments of these predictions are estimated via a Monte Carlo sampling of the posterior distribution. Since the reduced models are fast to solve, this sampling is computationally efficient. Furthermore, the proposed Bayesian framework provides a statistical interpretation of the regularization term that is present in the deterministic operator inference problem, and the empirical Bayes approach of maximum marginal likelihood suggests a selection algorithm for the regularization hyperparameters. The proposed method is demonstrated on two examples: the compressible Euler equations with noise-corrupted observations, and a single-injector combustion process.
Ancient Rock Quarries in Anuradhapura, Sri Lanka
Creators: name: Wagalawatta, Thusitha
name: Bebermeier, Wiebke
name: Knitter, Daniel
name: Kohlmeyer, Kay
name: Schütt, Brigitta
Publisher: name: Freie Universität Berlin
Year: 2015
Subjects: subject: Ancient quarrying
subject: historic built environment
subject: cultural landscape
subject: natural resources
subject: landscape evolution
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie::930 Geschichte des Altertums bis ca. 499, Archäologie

description: The ancient city of Anuradhapura (4th century BCE to 11th century CE), established on the banks of the river Malwathu Oya in north-central Sri Lanka, is one of that country’s most important archaeological sites. Numerous ancient buildings and monuments occur throughout the entire settlement. The preserved parts of the Anuradhapura ancient built environment are mostly solid masonry constructions. However, foundations, floor areas, pillars, and entrance units of the buildings provide evidence that rock materials were prominently used in constructions. This study focuses on the investigation of former rock quarry locations in the surroundings of Anuradhapura, their distributional pattern and their classification according to their morphological and archaeological significance. The majority of quarrying traces detected in the survey are distributed along a central rock outcrop line which runs across the city area. Altogether, 65 ancient rock quarries were identified in the area and classified into six categories. Moreover, numerous of historic stone buildings in the monasteries are also situated along the exposed rock outcrops line.
An ultra-dense fast outflow in a quasar at z=2.4
Creators: name: Williams, R. J.
name: Maiolino, R.
name: Krongold, Y.
name: Carniani, S.
name: Cresci, G.
name: Mannucci, F.
name: Marconi, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Adaptive Optics assisted near-IR integral field spectroscopic observations of a luminous quasar at $z = 2.4$, previously observed as the first known example at high redshift of large scale quasar-driven outflow quenching star formation in its host galaxy. The nuclear spectrum shows broad and blueshifted H$β$ in absorption, which is tracing outflowing gas with high densities ($>10^8$ - $10^9$ cm$^{-3}$) and velocities in excess of 10,000 km s$^{-1}$. The properties of the outflowing clouds (covering factor, density, column density and inferred location) indicate that they likely originate from the Broad Line Region. The energetics of such nuclear regions are consistent with that observed in the large scale outflow, supporting models in which quasar driven outflows originate from the nuclear region and are energy conserving. We note that the asymmetric profile of both the H$β$ and H$α$ emission lines is likely due to absorption by the dense outflowing gas along the line of sight. This outflow-induced asymmetry has implications on the estimation of the black hole mass using virial estimators, and warns about such effects for several other quasars characterized by similar line asymmetries. More generally, our findings may suggest a broader revision of the decomposition and interpretation of quasar spectral features, in order to take into account the presence of potential broad blueshifted Balmer absorption lines. Our high spatial resolution data also reveals redshifted, dynamically colder nebular emission lines, likely tracing an inflowing stream.
description: 14 pages, 11 figures
Iron, Humans and Landscape – Insights from a Micro-Region in the Widawa Catchment Area, Silesia
Creators: name: Thelemann, Michael
name: Lehnhardt, Enrico
name: Bebermeier, Wiebke
name: Meyer, Michael
Publisher: name: Freie Universität Berlin
Year: 2015
Subjects: subject: Bog iron ore
subject: early iron smelting
subject: formation
subject: human-environmental interactions
subject: landscape archaeology
subject: pre-Roman Iron Age
subject: Przeworsk culture
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie::930 Geschichte des Altertums bis ca. 499, Archäologie

description: The Widawa catchment area is located in Northeastern Silesia, Poland, and belonged to the southwestern distribution area of the Przeworsk culture from the younger pre-Roman period until the younger Roman period. It is estimated that iron smelting was introduced to this area with the emergence of the Przeworsk culture, circa the 2nd century BCE. Certain cultural and environmental requirements must have been met in order for this technology to spread to this area. Within the framework of interdisciplinary research, the archaeological context of an archaeological site as well as the natural archives were investigated to explore the preconditions and to describe the beginning of early iron smelting in this region.
Quantum Correlations and Coherence in Spin-1 Heisenberg Chains
Creators: name: Malvezzi, A. L.
name: Karpat, G.
name: Çakmak, B.
name: Fanchini, F. F.
name: Debarba, T.
name: Vianna, R. O.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We explore quantum and classical correlations along with coherence in the ground states of spin-1 Heisenberg chains, namely the one-dimensional XXZ model and the one-dimensional bilinear biquadratic model, with the techniques of density matrix renormalization group theory. Exploiting the tools of quantum information theory, that is, by studying quantum discord, quantum mutual information and three recently introduced coherence measures in the reduced density matrix of two nearest neighbor spins in the bulk, we investigate the quantum phase transitions and special symmetry points in these models. We point out the relative strengths and weaknesses of correlation and coherence measures as figures of merit to witness the quantum phase transitions and symmetry points in the considered spin-1 Heisenberg chains. In particular, we demonstrate that as none of the studied measures can detect the infinite order Kosterlitz-Thouless transition in the XXZ model, they appear to be able to signal the existence of the same type of transition in the biliear biquadratic model. However, we argue that what is actually detected by the measures here is the SU(3) symmetry point of the model rather than the infinite order quantum phase transition. Moreover, we show in the XXZ model that examining even single site coherence can be sufficient to spotlight the second-order phase transition and the SU(2) symmetry point.
description: 8 pages. 5 figures
title: The Digital Atlas of Innovations
title: A Research Program on Innovations in Prehistory and Antiquity
titleType: Subtitle
Creators: name: Hansen, Svend
name: Renn, Jürgen
name: Klimscha, Florian
name: Büttner, Jochen
name: Helwing, Barbara
name: Kruse, Sebastian
Publisher: name: Freie Universität Berlin
Year: 2016
Subjects: subject: Prehistory
subject: Chalcolithic
subject: Copper Age
subject: Bronze Age
subject: technological innovations
subject: diffusion
subject: mapping
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie

description: The authors discuss the simultaneous appearance of technological innovations in three key technologies (metallurgy, wheeled vehicles, weighing systems) in the second half of the 4th millennium. This is done from a source-critical perspective because the innova- tions are discussed with the help of dynamic maps from the Topoi project Digital Atlas of Innovations. Besides indications of diffusion gradients influenced by special research conditions, exceptional waves of innovation can be detected for all three technologies in the discussed period. These waves of innovation cannot, however, be generalized but have to be understood on the basis of the respective technology traditions and lines of devel- opment specific to local areas. Monocentric diffusion theories can be clearly disproven, local technology developments and their converging in certain centrally situated regions have to be assumed instead. Similarly, the transfer of objects and their châine opératoire can only be detected rather infrequently, while the adaptation to local socio-economic and environmental factors can be demonstrated.
Nanocrystalline vs. Amorphous n-Type Silicon Front Surface Field Layers in Silicon Heterojunction Solar Cells: Role of Thickness and Oxygen Content
Creators: name: Morales-Vilches, A.B.
name: Mazzarella, L.
name: Hendrichs, M.
name: Korte, L.
name: Schlatmann, R.
name: Stannowski, B.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Heterojunction Solar Cells

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 715-719
description: We report on a systematical investigation of the influence of layer thickness and oxygen content of different silicon-based n-doped layers deposited by Plasma Enhanced Chemical Vapor Deposition (PECVD) on silicon heterojunction (SHJ) solar cell performance. N-type amorphous (a-), nanocrystalline (nc-) hydrogenated silicon (Si:H) and silicon oxide (SiOx:H) films were used as front surface field (FSF) layers on rear emitter (RE) SHJ solar cells. The benefit, both in electrical and optical properties, of using nc-silicon layers, is demonstrated. The best cell in the oxygen variation experiment was obtained with an (n)nc-SiOx:H FSF having a refractive index n of 2.72 at 633 nm, which leads to an increase in short circuit current density, jsc, of more than 1 mA/cm2 as compared to a reference cell with an a-Si:H FSF. This higher jsc obtained in our best nc-SiOx:H prototypes leads to a conversion efficiency, , of 21.4%. It is also remarkable our best cell result, certified by ISFH CalTeC, with an improved nc-Si:H FSF that enabled an improved jsc of 38.6 mA/cm2 and an  of 22.5%.
title: The Whole Story
title: Bridging the Gap between Landscape-archaeological Data from Drylands and Wetlands
titleType: Subtitle
Creators: name: Groenewoudt, Bert
Publisher: name: Freie Universität Berlin
Year: 2015
Subjects: subject: Site preservation
subject: landscape archaeology
subject: alluvial archaeology
subject: off-site archaeology
subject: sampling strategy
subject: LLAND diagram
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie

description: Detailed historical reconstructions require high-quality data. In the traditionally densely settled higher and drier Pleistocene sandy areas (‘drylands’) of the North European Plain (the European aeolian sand belt) and comparable regions elsewhere evidence-based reconstructions are hampered by poor preservation of archaeological remains and archaeologically relevant deposits. This problem can be partially solved by combining, on a microregional level, dryland data with data from nearby wetland pockets (‘wetlands’), in particular stream valleys. This asks for an integrated and systematic inventory of all available data. For this purpose an instrument was developed: the Landscape-Land use Diagram (LLAND). Because data from dry and wet contexts are to some degree supplementary, integrated analysis is essential for obtaining information on the full range of economic and ritual practices. This is demonstrated by research carried out in the valley of the small river Regge (the Netherlands), the results of which are being treated as a stratified landscape-archaeological sample. This paper does not focus on cultural interpretation but on methodology, specifically the potential of data and the benefits of an integrated approach.
Efficient Multi-Scale 3D CNN with Fully Connected CRF for Accurate Brain Lesion Segmentation
Creators: name: Kamnitsas, Konstantinos
name: Ledig, Christian
name: Newcombe, Virginia F. J.
name: Simpson, Joanna P.
name: Kane, Andrew D.
name: Menon, David K.
name: Rueckert, Daniel
name: Glocker, Ben
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: We propose a dual pathway, 11-layers deep, three-dimensional Convolutional Neural Network for the challenging task of brain lesion segmentation. The devised architecture is the result of an in-depth analysis of the limitations of current networks proposed for similar applications. To overcome the computational burden of processing 3D medical scans, we have devised an efficient and effective dense training scheme which joins the processing of adjacent image patches into one pass through the network while automatically adapting to the inherent class imbalance present in the data. Further, we analyze the development of deeper, thus more discriminative 3D CNNs. In order to incorporate both local and larger contextual information, we employ a dual pathway architecture that processes the input images at multiple scales simultaneously. For post-processing of the network's soft segmentation, we use a 3D fully connected Conditional Random Field which effectively removes false positives. Our pipeline is extensively evaluated on three challenging tasks of lesion segmentation in multi-channel MRI patient data with traumatic brain injuries, brain tumors, and ischemic stroke. We improve on the state-of-the-art for all three applications, with top ranking performance on the public benchmarks BRATS 2015 and ISLES 2015. Our method is computationally efficient, which allows its adoption in a variety of research and clinical settings. The source code of our implementation is made publicly available.
description: This version was accepted in the journal Medical Image Analysis (MedIA)
Towards Multi Millisecond Spatially Homogeneous Carrier Lifetimes from Epitaxial Silicon Wafers Grown on Porous Silicon
Creators: name: Kajari-Schröder, S.
name: Gemmel, C.
name: Hensen, J.
name: Brendel, R.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Feedstock, Crystallisation, Wafering, Defect Engineering

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 339-342
description: Kerfless wafering is receiving renewed attention internationally due to a) the need of PV industry
to realize cost savings and to enhance resource efficiency along the value chain and b) due to the recent step
by step demonstrations of key components for the implementation of kerfless wafers in mainstream
photovoltaics: high electronic quality of the kerfless wafers, suitability for existing machinery (drop-in
replacement), and high solar cell efficiencies. We use the porous silicon (PSI) process for the fabrication of
kerfless monocrystalline silicon wafers. Here, we analyze the PSI wafer quality by analyzing the injectiondependent
carrier lifetimes of the samples with infrared lifetime mappings and photo conductance decay
measurements. We evaluate the reorganization of the PSI by scanning electron microscopy (SEM). We
successfully lift-off 7 out of 7 epitaxial PSI wafers on an area of 10 x 10 cm2 pseudosquare. The effective
lifetimes of these layers range from 836 to 1022 μs at an injection level of n=1015 cm-3 and the lifetime is
spatially homogeneous on the wafer area.
title: A novel non-spreading variant of transformed hamster fibroblasts
Creators: name: Abu-Zayyad, Amineh Naji
Publisher: name: University of Glasgow
Year: 1997
Subjects: subject: Genetics.

description: Using repeated plating on fibronectin-coated surfaces as a selection procedure, I isolated three different mutants unresponsive to fibronectin, from thioguanine resistant Py-BHK (TG) cells in a simple assay of cell spreading. All three were recloned on soft agar. Two had morphologies similar to lines which had been selected previously, FI and F2. The mutant F3, then a unique isolate, had a different morphology in culture. Whereas F1 colonies contain exclusively rounded cells, and F2 have a few partially spread cells, more scattered than F1, F3 has a spread epithelial-like morphology in culture. I selected F3 from TG cells, on the basis that this mutant is non- responsive to fibronectin. However, in spreading assays, I found that F3 spreads on fibronectin, when the simple saline in the assay (HEPES-buffered Hanks') is supplemented with foetal bovine serum, or replaced by Ham's F10. Unexpectedly, I found that the active component stimulating spreading of F3 was pyruvate. To explain the pyruvate requirement, I searched for an abnormality of glucose utilisation in F3. Glucose uptake, studied using 14C- labelled glucose, suggested there could be some such abnormality. However, separating metabolites from TG and F3 by one and two dimensional paper chromatography gave inconclusive results. The activity of mitochondrial dehydrogenases of TG and F3, measured using MTT, responded similarly to glucose, suggesting that pyruvate in F3 is more likely needed to supply metabolites than as an energy source. The possible identity of such metabolites and explanation for how F3 came to be selected, are discussed.
Superdiffusive quantum work and adiabatic quantum evolution in finite temperature chaotic Fermi systems
Creators: name: Grabarits, András
name: Kormos, Márton
name: Lovas, Izabella
name: Zaránd, Gergely
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the full distribution of quantum work in generic, noninteracting, disordered fermionic nanosystems at finite temperature. We derive an analytical determinant formula for the characteristic function of work statistics for quantum quenches starting from a thermal initial state. For work small compared to the thermal energy of the Fermi gas, work distribution is Gaussian, and the variance of work is proportional to the average work, while in the low temperature or large work limit, a non-Gaussian distribution with superdiffusive work fluctuations is observed. Similarly, the time dependence of the probability of adiabaticity crosses over from an exponential to a stretched exponential behavior. For large enough average work, the work distribution becomes universal, and depends only on the temperature and the mean work. Apart from initial low temperature transients, work statistics are well captured by a Markovian energy-space diffusion process of hard-core particles, starting from a thermal initial state. Our findings can be verified by measurements on nanoscale circuits or via single qubit interferometry.
description: 12+8 pages, 7+1 figures
Principles of Carrier-Selective Contacts Based on Induced Junctions
Creators: name: Bivour, M.
name: Messmer, C.
name: Neusel, L.
name: Zähringer, F.
name: Schön, J.
name: Glunz, S.W.
name: Hermle, M.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Heterojunction Solar Cells

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 348-352
description: The applicability of different high (low) work function thin films for the formation of alternative hole
(electron) selective contacts is currently (re-) explored for silicon solar cells. To provide some insight into contact
schemes based on induced junctions their operation principles, important design parameters and losses are reviewed
experimentally and with the help of numerical device simulations. Simulations with Sentaurus TCAD are used to address
the importance of the work function and an efficient tunneling transport. It is highlighted that “non-selective” contacts
will not obey the standard diode theory. This calls for an adapted loss analysis and one approach for this is presented for
different hole contacts prepared by evaporation, sputtering, atomic layer deposition and PECVD. The results show that
the “classical” electrical losses of selective contacts, like recombination and ohmic transport which are well quantified by
J0 and the ohmic contact resistance, are not sufficient for the evaluation of “non-selective” contacts.
Los pactos parasociales en las sociedades por acciones simplificadas : hacia una mayor seguridad jurídica y transparencia
Creators: name: Romero Castañeda, Javier Augusto
Publisher: name: Universidad Externado de Colombia
Year: 2024
Subjects: subject: Derecho comercial - Aspectos jurídicos
subject: Sociedades civiles - Derecho
subject: Responsabilidad contractual - Legislación
subject: Pactos parasociales
subject: Sociedad por acciones simplificada
subject: Seguridad jurídica
subject: Transparencia

description: Por medio del presente trabajo se examina los pactos parasociales y su uso en las sociedades por acciones simplificadas. Para ello se revisa brevemente su surgimiento y características, junto con un conciso estudio de derecho comparado, para que posteriormente se pueda analizar cómo la celebración de este tipo de acuerdos podrían afectar el interés social y la transparencia a partir de su flexibilidad, concluyendo al fin que, la comprensión normativa que respaldan estos acuerdos no es suficiente, siendo crucial la adopción de controles ex ante y ex post, principalmente en el aumento de su regulación, teniendo en cuenta que estos controles son esenciales para identificar y mitigar el riesgo asociado a la práctica de este tipo de acuerdos, pudiendo de esta manera amentar la protección de todos los actores dentro del entorno empresarial.
description: Through this work, shareholders' agreements and their use in simplified joint-stock companies are examined. To do this, its emergence and characteristics are briefly reviewed, along with a concise study of comparative law, so that it can subsequently be analyzed how the conclusion of this type of agreements could affect social interest and transparency based on its flexibility, finally concluding that, the regulatory understanding that supports these agreements is not sufficient, being crucial the adoption of ex ante and ex post controls, mainly in the increase of its regulation, taking into account that these controls are essential to identify and mitigate the risk associated with the practice of this type of agreements, thus being able to increase the protection of all actors within the business environment.
GCD of sums of $k$ consecutive squares of generalized Fibonacci numbers
Creators: name: Mbirika, aBa
name: Spilker, Jürgen
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 11B39 (Primary), 11A05, 11B50 (Secondary)

description: In 2021, Guyer and Mbirika gave two equivalent formulas that computed the greatest common divisor (GCD) of all sums of $k$ consecutive terms in the generalized Fibonacci sequence $\left(G_n\right)_{n \geq 0}$ given by the recurrence $G_n = G_{n-1} + G_{n-2}$ for all $n \geq 2$ with integral initial conditions $G_0$ and $G_1$. In this current paper, we extend their results to the GCD of all sums of $k$ consecutive squares of these numbers. Denoting these GCD values by the symbol $\mathcal{G}_{G_0, G_1}^2\!(k)$, we prove $\mathcal{G}_{G_0, G_1}^2\!(k) = \gcd\left(G_k G_{k+1} - G_0 G_1,\; G_{k+1}^2 - G_1^2,\; G_{k+2}^2 - G_2^2\right)$. Moreover, we provide very tantalizing closed forms in the specific settings of the Fibonacci, Lucas, and generalized Fibonacci numbers. We close with a number of open questions for further research.
description: 15 pages, this version is the one that is published
The Early History of Weighing Technology from the Perspective of a Theory of Innovation
Creators: name: Büttner, Jochen
name: Renn, Jürgen
Publisher: name: Freie Universität Berlin
Year: 2016
Subjects: subject: Evolution of knowledge
subject: mechanics
subject: weighing technology
subject: innovation
subject: practical knowl- edge
subject: unequal-arm balance
subject: 900 Geschichte und Geografie::930 Geschichte des Altertums (bis ca. 499), Archäologie

description: The article advances a framework allowing for a unified description of technical innova- tion and the advancement of theoretical knowledge. Cognitive structures based on fore- going actions with physical objects are externally represented by artifacts, language or writing. The exploration of actions with these external representations such as the fabri- cation and usage of new devices or the composition of texts opens up new possibilities for a reflective abstraction leading to new cognitive structures. The exploration of the options for actions is canalized by historically specific contexts constraining the actors. Based on the example of the early history of weighing with a focus on the establishment and differentiation of unequal-arm balances we elaborate the consequences of such an account
Electroless-Plated Metallization for n-Type Silicon Solar Cells
Creators: name: Lee, Y.-L.
name: Lin, M.-S.
name: Lai, K.-C.
name: Chung, C.-C.
name: Li, C.-C.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Homojunction Solar Cells

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 684-686
description: In this work, both front- and rear-side metallization based on electrochemical plating contacts is proposed for n-type crystalline silicon solar cells. The influences of laser open fraction of rear-side surface on cell performances are investigated. Electroless-plated Ni is used as seed layer on rear-side surface, which is combined with rear-side electroplated Cu and front-side electroplated Ni/Cu metallization. The results of Suns-Voc measurement indicate the surface damage and recombination issues, resulting from laser open fraction of rear-side surface of cells. A difference of conversion efficiency between 3.9 and 9.5% open fraction is about 0.74% for Ni/Cu metallization cells.
Robust Low-Bias Negative Differential Resistance in Graphene Superlattices
Creators: name: Esfahlan, S. M. Sattari
name: Oskuei, J. Fouladi
name: Shojaei, S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Here, we present a detailed study on low bias current-voltage (I-V) characteristic of graphene superlattice (GSL) resonant tunneling diode (RTD) with heterostructured substrate and series of grounded metallic planes placed over graphene sheet which induce periodically modulated Dirac gap and Fermi velocity barrier. We investigate the effect of GSL parameters on I-V characteristics within the Landauer-Buttiker formalism and adopted transfer matrix method. We show how the engineering these parameters results in multipeak NDR in proposed device. Moreover we provide a novel venue to control the NDR in GSL with Fermi velocity engineering. From this viewpoint we obtain multipeak NDR through miniband align in GSL. Maximum Pick to Valley ratio (PVR) up to 167 obtained for correlation velocity of 1.9 and bias voltages between 70-130 mV. Our finding in low bias regime and high PVR multipeak NDR have a considerable importance in multi-valued memory functional circuit, low power and high-speed nanoelectronic devices application.
description: 13 pages, 5 Figures
Reconciling the Quality vs Popularity Dichotomy in Online Cultural Markets
Creators: name: Gaeta, Rossano
name: Garetto, Michele
name: Ruffo, Giancarlo
name: Flammini, Alessandro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences
subject: H.3.3

description: We propose a simple model of an idealized online cultural market in which $N$ items, endowed with a hidden quality metric, are recommended to users by a ranking algorithm possibly biased by the current items' popularity. Our goal is to better understand the underlying mechanisms of the well-known fact that popularity bias can prevent higher-quality items from becoming more popular than lower-quality items, producing an undesirable misalignment between quality and popularity rankings. We do so under the assumption that users, having limited time/attention, are able to discriminate the best-quality only within a random subset of the items. We discover the existence of a harmful regime in which improper use of popularity can seriously compromise the emergence of quality, and a benign regime in which wise use of popularity, coupled with a small discrimination effort on behalf of users, guarantees the perfect alignment of quality and popularity ranking. Our findings clarify the effects of algorithmic popularity bias on quality outcomes, and may inform the design of more principled mechanisms for techno-social cultural markets.
description: ACM Trans. Inf. Syst. April 2022
Rapid Vapor-Phase Direct Diffused Emitter for Solar Cell Applications
Creators: name: Kühnhold-Pospischil, S.
name: Gust, E.
name: Amiri, D.
name: Richter, A.
name: Steinhauser, B.
name: Drießen, M.
name: Michl, B.
name: Greulich, J.
name: Benick, J.
name: Lindekugel, S.
name: Janz, S.
Publisher: name: WIP
Year: 2017
Subjects: Silicon Photovoltaics
Homojunction Solar Cells

description: 33rd European Photovoltaic Solar Energy Conference and Exhibition; 396-398
description: Emitter diffusion using POCl3 or BBr3 as precursor is a time consuming process and requires chemical
treatments to remove silicate glasses after the diffusion process. Moreover, no standard emitter diffusion process using
BBr3 is established so far. A so called rapid vapor direct diffused emitter (RVD) might be an alternative to these POCl3
and BBr3 diffusion processes. Here, we present several RVD emitter profiles in n-type wafers achieved using the rapid
thermal chemical vapor deposition (RTCVD 160) tool by varying diborane (B2H6) concentrations, peak temperatures and
durations. Further, temperature induced degradation of carrier lifetimes is observed.