cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A ferrofluid based neural network: design of an analogue associative memory
Creators: name: Palm, R.
name: Korenivski, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We analyse an associative memory based on a ferrofluid, consisting of a system of magnetic nano-particles suspended in a carrier fluid of variable viscosity subject to patterns of magnetic fields from an array of input and output magnetic pads. The association relies on forming patterns in the ferrofluid during a trainingdphase, in which the magnetic dipoles are free to move and rotate to minimize the total energy of the system. Once equilibrated in energy for a given input-output magnetic field pattern-pair the particles are fully or partially immobilized by cooling the carrier liquid. Thus produced particle distributions control the memory states, which are read out magnetically using spin-valve sensors incorporated in the output pads. The actual memory consists of spin distributions that is dynamic in nature, realized only in response to the input patterns that the system has been trained for. Two training algorithms for storing multiple patterns are investigated. Using Monte Carlo simulations of the physical system we demonstrate that the device is capable of storing and recalling two sets of images, each with an accuracy approaching 100%.
description: submitted to Neural Networks
Connecting the Sun Competing in the Energy Sector - On the Road to Large Scale PV Grid Integration
Creators: name: Rekinger, M.
name: Theologitis, I.T.
name: Masson, G.
name: Kreutzkamp, P.
name: De Brabandere, K.
name: Croufer, M.
Publisher: name: WIP
Year: 2012
Subjects: PV - a Major Electricity Source
PV in the Electricity Mix

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 4431-4438
description: With a more diversified, variable and presumably electricity-intensive energy mix, the future European
electricity system will have to be more interconnected, more flexible and more decentralised. The enhancements of
the grids, both at distribution and transmission level, will accompany the complete transformation of the electricity
sector. They should in particular integrate the rise of distributed generation, including photovoltaic (PV) electricity,
which will play a key role in Europe’s electricity mix given its competitiveness trajectory. The experience of the last
decade has shown that underestimating the technological and implementation potential of PV leads to suboptimal
situations both from a capacity planning and a network operation point of view. Navigating through the transition
towards a more sustainable energy future therefore requires tangible scenario-based forecasts. This paper is based on
the latest study “Connecting the Sun” (September 2012) prepared by the European Photovoltaic Industry Association
(EPIA) and aims to provide a vision regarding the main challenges that the current electricity system might face and
how available solutions could contribute in order for solar electricity to be integrated in the electricity system
avoiding security of supply concerns.
Flexoelectricity in soft elastomers and the molecular mechanisms underpinning the design and emergence of giant flexoelectricity
Creators: name: Grasinger, Matthew
name: Mozaffari, Kosar
name: Sharma, Pradeep
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Soft robotics requires materials that are capable of large deformation and amenable to actuation with external stimuli such as electric fields. Energy harvesting, biomedical devices, flexible electronics and sensors are some other applications enabled by electro-active soft materials. The phenomenon of flexoelectricity is an enticing alternative that refers to the development of electric polarization in dielectrics when subjected to strain gradients. In particular, flexoelectricity offers a direct linear coupling between a highly desirable deformation mode (flexure) and electric stimulus. Unfortunately, barring some exceptions, the flexoelectric effect is quite weak and rather substantial bending curvatures are required for an appreciable electro-mechanical response. Most experiments in the literature appear to confirm modest flexoelectricity in polymers although perplexingly, a singular work has measured a "giant" effect in elastomers under some specific conditions. Due to the lack of an understanding of the microscopic underpinnings of flexoelectricity in elastomers and a commensurate theory, it is not currently possible to either explain the contradictory experimental results on elastomers or pursue avenues for possible design of large flexoelectricity. In this work, we present a statistical-mechanics theory for the emergent flexoelectricity of elastomers consisting of polar monomers. The theory is shown to be valid in broad generality and leads to key insights regarding both giant flexoelectricity and material design. In particular, the theory shows that, in standard elastomer networks, combining stretching and bending is a mechanism for obtaining giant flexoelectricity, which also explains the aforementioned, surprising experimental discovery.
description: A copy of the SI can be found in the Ancillary files
Monocrystalline Back-Contact PV Technology Versus Polycrystalline Standard Technology
Creators: name: Grottke, M.
name: Beck, O.
Publisher: name: WIP
Year: 2012
Subjects: Components for PV Systems
PV Modules

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 3356-3358
description: The objective of this action was to determine differences in yield for two high quality PV systems
using (a) high efficiency monocrystalline back-contact cell PV modules and (b) polycrystalline “standard” cell PV
modules. A side by side comparison of two similar sized and oriented PV arrays connected to two equal inverters
revealed that the tested monocrystalline back-contact cell technology allows harvesting 46% more electricity per
available area than the tested polycrystalline module technology in Southern German climate. This paper describes
the systems in comparison and the test results.
HANDS: A Multimodal Dataset for Modeling Towards Human Grasp Intent Inference in Prosthetic Hands
Creators: name: Han, Mo
name: Günay, Sezen Ya{ğ}mur
name: Schirner, Gunar
name: Padır, Taşkın
name: Erdo{ğ}muş, Deniz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Upper limb and hand functionality is critical to many activities of daily living and the amputation of one can lead to significant functionality loss for individuals. From this perspective, advanced prosthetic hands of the future are anticipated to benefit from improved shared control between a robotic hand and its human user, but more importantly from the improved capability to infer human intent from multimodal sensor data to provide the robotic hand perception abilities regarding the operational context. Such multimodal sensor data may include various environment sensors including vision, as well as human physiology and behavior sensors including electromyography and inertial measurement units. A fusion methodology for environmental state and human intent estimation can combine these sources of evidence in order to help prosthetic hand motion planning and control. In this paper, we present a dataset of this type that was gathered with the anticipation of cameras being built into prosthetic hands, and computer vision methods will need to assess this hand-view visual evidence in order to estimate human intent. Specifically, paired images from human eye-view and hand-view of various objects placed at different orientations have been captured at the initial state of grasping trials, followed by paired video, EMG and IMU from the arm of the human during a grasp, lift, put-down, and retract style trial structure. For each trial, based on eye-view images of the scene showing the hand and object on a table, multiple humans were asked to sort in decreasing order of preference, five grasp types appropriate for the object in its given configuration relative to the hand. The potential utility of paired eye-view and hand-view images was illustrated by training a convolutional neural network to process hand-view images in order to predict eye-view labels assigned by humans.
A Comprehensive Memory Safety Analysis of Bootloaders
Creators: name: Wang, Jianqiang
name: Wang, Meng
name: Wang, Qinying
name: Langius, Nils
name: Shi, Li
name: Abbasi, Ali
name: Holz, Thorsten
Publisher: name: CISPA
Year: 2025

description: The bootloader plays an important role during the boot process, as it connects two crucial components: the firmware and the operating system. After powering on, the bootloader takes control from the firmware, prepares the early boot environment, and then hands control over to the operating system. Modern computers often use a feature called secure boot to prevent malicious software from loading at startup. As a key part of the secure boot chain, the bootloader is responsible for verifying the operating system, loading its image into memory, and launching it. Therefore, the bootloader must be designed and implemented in a secure manner. However, bootloaders have increasingly provided more features and functionalities for end users. As the code base grows, bootloaders inevitably expose more attack surfaces. In recent years, vulnerabilities, particularly memory safety violations, have been discovered in various bootloaders. Some of these vulnerabilities can lead to denial of service or even bypass secure boot protections. Despite the bootloader’s critical role in the secure boot chain, a comprehensive memory safety analysis of bootloaders has yet to be conducted. In this paper, we present the first comprehensive and systematic memory safety analysis of bootloaders, based on a survey of previous bootloader vulnerabilities. We examine the potential attack surfaces of various bootloaders and how these surfaces lead to vulnerabilities. We observe that malicious input from peripherals such as storage devices and networks is a primary method attackers use to exploit bootloader vulnerabilities. To assist bootloader developers in detecting vulnerabilities at scale, we designed and implemented a bootloader fuzzing framework based on our analysis. In our experiments, we discovered 39 vulnerabilities in nine bootloaders, of which 38 are new vulnerabilities. In particular, 14 vulnerabilities were found in the widely used Linux standard bootloader GRUB, some of which can even lead to secure boot bypass if properly exploited. So far, five CVEs have been assigned to our findings.
Surface modes and breathers in finite arrays of nonlinear waveguides
Creators: name: Bludov, Yu. V.
name: Konotop, V. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We present the complete set of symmetric and antisymmetric (edge and corner) surface modes in finite one-- and two--dimensional arrays of waveguides. We provide classification of the modes based on the anti-continuum limit, study their stability and bifurcations, and discuss relation between surface and bulk modes. We put forward existence of surface breathers, which represent two-frequency modes localized about the array edges.
description: Accepted for publication in Physical Review E
Conservative relativistic algebrodynamics induced on an implicitly defined worldline
Creators: name: Challa, Abdel
name: Kassandrov, Vladimir V.
name: Markova, Nina V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In the framework of the Stueckelberg-Wheeler-Feynman concept of a ``one-electron Universe'' we consider a worldline implicitly defined by a system of algebraic (precisely, polynomial) equations. Collection of pointlike ``particles'' of two kinds on the worldline (or its complex extension) is defined by the real (complex conjugate) roots of the polynomial system and detected then by an external inertial observer through the light cone connections. Then the observed collective dynamics of the particles' ensemble is, generally, subject to a number of Lorentz invariant conservation laws. Remarkably, this poperty follows from the Vieta's formulas for the roots of the generating polynomial system. At some discrete moments of the observer's proper time, mergings and subsequent transmutations of a pair of particles-roots take place simulating thus the processes of annihilation/creation of a particle/antiparticle pair
description: 7 pages, twoside, 1 figure
A New Method for High Resistance Against Potential Induced Degradation
Creators: name: Mehlich, H.
name: Decker, D.
name: Scheit, U.
name: Uhlig, M.
name: Frigge, S.
name: Runge, M.
name: Heinze, B.
name: Sperlich, H.-P.
name: Mai, J.
name: Schlemm, H.
name: Vetter, E.
name: Höhne, J.
name: Reichel, S.
name: Stein, W.
Publisher: name: WIP
Year: 2012
Subjects: Components for PV Systems
PV Modules

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 3411-3413
description: During the last years the effect of the potential induced degradation (PID) of crystalline Si solar modules was object
of intensive research activities. However, the full understanding of the degradation mechanism and the complex
relationship at module and cell level needs more investigation. This work was focused on preventing PID on cell
level. Several methods for accelerated degradation of output power for different cell structures were studied. It was
found that the PID behavior can be influenced by the nature of cell pretreatment steps. Furthermore, a new process
step before the subsequent silicon nitride deposition has been developed and optimized for best cell performance. The
silicon nitride layer (SiN), investigated in our study has to provide a high passivation quality, a low optical loss and
reliable PID resistance.
Resonance Induced Enhancement of Up-Conversion in Ultrathin Layers
Creators: name: Andriamiadamanana, C.
name: Joudrier, A.L.
name: Lombez, L.
name: Ferrier, A.
name: Naghavi, N.
name: Ghenuche, P.
name: Bardou, N.
name: Vandamme, N.
name: Pelouard, J.-L.
name: Collin, S.
name: Pellé, F.
name: Guillemoles, J.F.
Publisher: name: WIP
Year: 2012
Subjects: Material Studies, New Concepts and Ultra-High Efficiency
New Materials, Cells and Modules

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 61-62
description: There are two main loss sources in solar cells which are the thermalisation and the non-absorption
processes. Up to 30 to 50% of the solar spectrum power is lost by the second process, because of the intrinsic
properties of semi-conductors. Whereas up-conversion process could reduce this loss, application to photovoltaics is
limited by the up-conversion efficiency of materials. We propose to use a plasmonic structure to overcome this
limitation, using erbium doped yttrium fluoride thin layer elaborated by ALD at 250°C as active up-converter
material. Near infrared and visible up-conversion properties of samples have been characterized using a confocal
microscope. Samples, having a thickness below 100 nm, deposited onto a gold mirror, exhibit significant upconversion.
Plasmonic structures were fabricated by e-beam lithography, resist development, gold deposition and liftoff
process. The confinement of the incident photon inside the structures and the resonance tuned at the absorption
frequency of the ion allows the increase of the absorption of the Er3+. The measurement of the enhancement factor of
structures associated with the plasmonic resonator has been performed by luminescence cartography. From these
data, total average enhancement factor up to x45 has been achieved by the use of the plasmonic structures, with
maximal values close to x450 for some frequencies, as compared to a layer deposited on a bare glass substrate.
Comparison of PV Evaluation Programs Based on the Long-Term PV-Measurement Campaign of the Berne University of Applied Sciences
Creators: name: Muntwyler, U.
name: Schärf, P.
name: Münger, M.
name: Hauser, M.
name: Heiniger, T.
Publisher: name: WIP
Year: 2012
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 4158-4160
description: Based on these data of the PV long term measurement campaign of the Berne University of Applied Sciences (BUAS) in
Burgdorf (Switzerland) we compared seven PV calculation programs with two different studies. We used different sites on
different climatic situations to evaluate the accuracy of the programs.
The Berne University of Applied Sciences in the town of Burgdorf near Berne in Switzerland is measuring PV-installations in a
long term test campaign since more than 20 years with high precision. Actually more than 70 installations are measured. For
the study we used two installations in Burgdorf and the football stadium in Bern with more than 1,3 MWp as a typical sites for
the Swiss Basin. Another installation was the 500 kWp site on the mountain range of the Jura. For the alpine climatic situation
we used the PV installation on the Jungfraujoch on 3’454 m asli.
In this first BSc-studyii done by Marc Hauser he used the PV program PVSyst from the University of Geneva to calculate the
accuracy of the simulations against the result from the existing plants.
In the second BSc-study done by Thomas Heinigeriii four freeware and 3 professional PV-simulation programs were compared
with the results of the first study.
Wormholes and Teleporters
Creators: name: Nikitin, Igor
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In general relativity, there is a class of solutions that currently do not have observed analogues, but on which the theory is shaped, giving an understanding what is fundamentally possible within its framework. Such solutions include wormholes, tunnels that connect distant regions in spacetime. Although not a single wormhole has yet been discovered, there is a large number of works devoted to their study, thanks to which wormholes as a class of solutions become firmly established in modern science. In this paper, we consider two topologically nontrivial types of solutions related to wormholes. First: wormholes that can open and close. In this relation, we will discuss topological censorship theorems, which under certain conditions prohibit changing topology. We will also discuss known ways to circumvent these theorems. Using analytical and numerical methods, as well as visualization, we will construct an example of an opening and closing wormhole with the dimensions of the central black hole in the Milky Way galaxy. Our construction continues the work by Kardashev, Novikov and Shatskiy, in which a static wormhole with the same parameters was considered. The second type is a modification of Visser's dihedral wormhole solution for a dynamic case, which can be considered as a model of a teleportation event.
Criticality in diluted ferromagnet
Creators: name: Agliari, Elena
name: Barra, Adriano
name: Camboni, Federico
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We perform a detailed study of the critical behavior of the mean field diluted Ising ferromagnet by analytical and numerical tools. We obtain self-averaging for the magnetization and write down an expansion for the free energy close to the critical line. The scaling of the magnetization is also rigorously obtained and compared with extensive Monte Carlo simulations. We explain the transition from an ergodic region to a non trivial phase by commutativity breaking of the infinite volume limit and a suitable vanishing field. We find full agreement among theory, simulations and previous results.
description: 23 pages, 3 figures
Data Activism in higher education, a scholarly commitment
Creators: name: Raffaghelli, Juliana Elisa
name: Kuhn, Caroline
name: Berga, Quelic
Publisher: name: Zenodo
Year: 2021
Subjects: Learning Analytics, Students' Data, Pedagogy, Equity, Ethics

description: This deliverable is part of the Open Educational Resource generated under the project "Understanding Data: Politics & Praxis" https://datapraxis.net/ In this module we will explore the concepts of readability, agency and negotiability applied to learning analytics. We will learn how datafication in the field of educational platforms affects university teachers and their work. We will finish this journey by suggesting that the technological advances that lead to the use of data-driven techniques cannot be passively experienced by teachers. Rather, they must be continuously active in pushing for the readability of data infrastructures and participating in the negotiation processes related to the oversight and privacy of students and of the teachers themselves. University teachers' ultimate goal is to be involved and committed, to play an active role, i.e., to have "agency" with respect to data technologies and infrastructures, in a journey that is made at the same time as the technology is developed, rather than passively accepting it after the event. This is why we will speak of "data activism". As learning analytics become more popular and some experimental and commercial applications are rolled out, university teachers need to pay attention to how technologies become part of their educational experiences and what values and imaginaries are assigned to data in teaching and learning. Specifically, it is necessary to consider the economic interests and the desire to control behaviour underlying many of the technological solutions put forward as a panacea producing information that makes teaching better, easier or more accurately targeted. Thus, our journey will start from the exploration of the concept and applications of learning analytics and its objective of supporting more effective behavioural patterns in teachers and students. Going beyond the techno-solutionism that has frequently permeated discourses and research on learning analytics, we will focus on critical literature concerning the use of educational data and, in particular, the associated ethical concerns. In order to find a balance between techno-enthusiasm and techno-disillusionment, we will look at cases that examine data in education from complex, interdisciplinary and participatory perspectives. Finally, we will consider the value of data activism in education, as a mindset and attitude that implies a critical and transformative perspective towards the evolving techno-structure, requiring agency, negotiability and readability as the means to build fair data cultures in higher education and in society.
NIR Sensitizers for Dye Sensitized Solar Cells - Heptamethine Dyes with a Great Spectral Diversity above 700 nm
Creators: name: Geiger, T.
name: Schoger, I.
name: Hochleitner, S.
name: Nüesch, F.
name: Oswald, F.
name: Meyer, T.
Publisher: name: WIP
Year: 2012
Subjects: Thin Film Solar Cells
Organic-based PV

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 2948-2949
description: The company Solaronix and Empa focus on the development of new unsymmetrical heptamethine dyes for application in dye sensitized solar cells. Because of their out-standing physical properties (e.g. high extinction coefficient and absorption maximum above 700 nm), these dyes are very promising NIR sensitizers. By skillful combination of different heterocycles and dianil derivatives, it is possible to synthesize and characterize various functionalized unsymmetrical heptamethine dyes. Furthermore, the efficiency of industrial dye sensitized solar cells prepared with such sensitizers is up to 1.3%. Remarkably, dye sensitized solar cells with heptamethine dyes, which solely absorb light in the NIR, appear in light yellow, the color of the electrolyte.
Determination of spectroscopic parameters for 313 M dwarf stars from their APOGEE Data Release 16 H-band spectra
Creators: name: Sarmento, Pedro
name: Rojas-Ayala, Bárbara
name: Mena, Elisa Delgado
name: Blanco-Cuaresma, Sergi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The scientific community's interest on the stellar parameters of M dwarfs has been increasing over the last few years, with potential applications ranging from galactic characterization to exoplanet detection. The main motivation for this work is to develop an alternative and objective method to derive stellar parameters for M dwarfs using the H-band spectra provided by the Apache Point Observatory Galactic Evolution Experiment (APOGEE). Synthetic spectra generated with \textit{iSpec}, \textit{Turbospectrum}, \textit{MARCS} models atmospheres and a custom made line list including over 1 000 000 water lines, are compared to APOGEE observations, and parameters are determined through $χ^2$ minimization. Spectroscopic parameters ($T_\mathrm{eff}$, $[M/H]$, $\log g$, $v_{mic}$) are presented for a sample of 313 M dwarfs, obtained from their APOGEE H-band spectra. The generated synthetic spectra reproduce observed spectra to a high accuracy level. The impact of the spectra normalization on the results are analyzed as well. Our output parameters are compared with the ones obtained with APOGEE Stellar Parameter and Chemical Abundances Pipeline (ASPCAP) for the same stellar spectrum, and we find that the values agree within the expected uncertainties. Comparisons with other previous near-infrared and optical literature are also available, with median differences within our estimated uncertainties found in most cases. Possible reasons for these differences are explored. The full H-band line list, the line selection for the synthesis, and the synthesized spectra are available for download, as are the calculated stellar parameters.
description: 16 pages of text + 13 figures, then 20 pages of appendices and tables, including 6 additional figures. Total 36 pages, 19 figures. Accepted by Astronomy and Astrophysics on 8/03/2021
Grain Boundary Motion Exhibits the Dynamics of Glass-Forming Liquids
Creators: name: Zhang, Hao
name: Srolovitz, David J.
name: Douglas*, Jack F.
name: Warren, James A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Polycrystalline materials can be viewed as composites of crystalline particles or grains separated from one another by thin amorphous grain boundary (GB) regions. While GB have been exhaustively investigated at low temperatures, where these regions resolve into complex ordered structures accessible to measurement, much less is known about them at higher temperatures where the GB can exhibit significant mobility, structural disorder, and where experimental characterization methods are limited. The time and spatial scales accessible to molecular dynamics (MD) simulation make this method appropriate for investigating both the dynamical and structural properties of grain boundaries at elevated temperatures. In the present study, we use MD simulations to determine how the GB dynamics changes with temperature and applied stress. It has long been hypothesized that GB have features in common with glass-forming liquids based on the processing characteristics of polycrystalline materials. We find remarkable support for this suggestion, as evidenced by string-like collective motion, transient caging of atom motion, and non-Arrhenius (Vogel-Fulcher) temperature dependence of GB mobility. Evidently, the frustration caused by the inability of atoms in GB region to simultaneously order with respect to competing grains is responsible for this striking similarity. The paradigm that grains in a polycrystalline material are encapsulated by a frustrated fluid provides a powerful conceptual model of polycrystalline materials, pointing the way to improved control over their material properties.
description: Plan to submit paper to Proceedings of the National Academy of Science (USA)
Dust Distribution during Reionization
Creators: name: Elfgren, Erik
name: Désert, Francois-Xavier
name: Guiderdoni, Bruno
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The dust produced by the first generation of stars will be a foreground to cosmic microwave background. In order to evaluate the effect of this early dust, we calculate the power spectrum of the dust emission anisotropies and compare it with the sensitivity limit of the Planck satellite. The spatial distribution of the dust is estimated through the distribution of dark matter. At small angular scales ($\ell \gtrsim 1000$) the dust signal is found to be noticeable with the Planck detector for certain values of dust lifetime and production rates. The dust signal is also compared to sensitivities of other instruments. The early dust emission anisotropies are finally compared to those of local dust and they are found to be similar in magnitude at mm wavelengths.
description: 6 pages, 6 figures; Typos fixed. Clarifications in the abstract, sections 2 and 4.1 and fig 6
Transversity quark distributions in a covariant quark-diquark model
Creators: name: Cloët, I. C.
name: Bentz, W.
name: Thomas, A. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Transversity quark light-cone momentum distributions are calculated for the nucleon. We utilize a modified Nambu--Jona-Lasinio model in which confinement is simulated by eliminating unphysical thresholds for nucleon decay into quarks. The nucleon bound state is obtained by solving the relativistic Faddeev equation in the quark-diquark approximation, where both scalar and axial-vector diquark channels are included. Particular attention is paid to comparing our results with the recent experimental extraction of the transversity distributions by Anselmino et al. We also compare our transversity results with earlier spin-independent and helicity quark distributions calculated in the same approach.
description: 7 pages and 6 figures
$Υ$ production in p+p and Au+Au collisions in STAR
Creators: name: Das, Debasish
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The study of quarkonium production in relativistic heavy ion collisions provides insight into the properties of the produced medium. The lattice studies show a sequential suppression of quarkonia states when compared to normal nuclear matter; which further affirms that a full spectroscopy including bottomonium can provide us a better thermometer for the matter produced under extreme conditions in relativistic heavy ion collisions. With the completion of the STAR Electromagnetic Calorimeter and with the increased luminosity provided by RHIC in Run 6 and 7, the study of $Υ$ production via the di-electron channel becomes possible. We present the results on $Υ$ measurements in p+p collisions (from Run 6) along with the first results from Au+Au collisions (in Run 7) at $\sqrt{s_{\rm{NN}}} = 200$ GeV from the STAR experiment.
description: 4 pages and 2 figures, Oral Presentation at QM2008 February 4-10, 2008: Jaipur India. submitted to Journal Of Physics-G:Nuclear and Particle Physics
Signature of the microcavity exciton-polariton relaxation mechanism in the polarization of emitted light
Creators: name: Roumpos, Georgios
name: Lai, Chih-Wei
name: Liew, T. C. H.
name: Rubo, Yuri G.
name: Kavokin, A. V.
name: Yamamoto, Yoshihisa
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have performed real and momentum space spin-dependent spectroscopy of spontaneously formed exciton polariton condensates for a non-resonant pumping scheme. Under linearly polarized pump, our results can be understood in terms of spin-dependent Boltzmann equations in a two-state model. This suggests that relaxation into the ground state occurs after multiple phonon scattering events and only one polariton-polariton scattering. For the circular pumping case, in which only excitons of one spin are injected, a bottleneck effect is observed, implying inefficient relaxation.
description: 7 pages, 7 figures
Plasmarings as dual black rings
Creators: name: Lahiri, Subhaneil
name: Minwalla, Shiraz
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct solutions to the relativistic Navier-Stokes equations that describe the long wavelength collective dynamics of the deconfined plasma phase of N=4 Yang Mills theory compactified down to d=3 on a Scherk-Schwarz circle and higher dimensional generalisations. Our solutions are stationary, axially symmetric spinning balls and rings of plasma. These solutions, which are dual to (yet to be constructed) rotating black holes and black rings in Scherk-Schwarz compactified AdS(5) and AdS(6), and have properties that are qualitatively similar to those of black holes and black rings in flat five dimensional supergravity.
description: 40 pages, 40 figures. (v2) Correction to black brane equation of state, additional references
First Results of the Thin Film PV Facade on Four Sides in Zürich
Creators: name: Muntwyler, U.
Publisher: name: WIP
Year: 2012
Subjects: PV Systems
PV and Architecture

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 4215-4219
description: Actually, two 60 m buildings will be retrofitted in Zürich. As part of the retrofit-plan, the owner, the building cooperative Zurlinden
BG use thin film PV-modules instead of conventional façade elements. The Berne University of Applied Sciences (BUAS) planned
the facades and the installation of the PV modules, the selection of the inverters etc. On all four sides 882 microcrystalline tandem
PV-modules were used. The finally connected power is 108’288 Wp. It is one of the biggest installations in this kind. The expected
energy production over the year should be 40.75 MWh. The first building was completed and injects energy in the local grid since
December 2011.
The installation was done under the circumstances that all four sides are economically viable under normal conditions without using
a feed in tariff. This example shows that thin film facades are an interesting market niche for PV. We will present some of the first
results of the installation. In future we will measure the production of the different sides and we will examine the effects of
temperature, partial shading etc.
The Micro-Inverter as an Important Tool for Optimized PV System Design
Creators: name: Zanger, S.
Publisher: name: WIP
Year: 2012
Subjects: Components for PV Systems
Balance of System Components

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 3720-3722
description: The determination of the optimal inverter concept for a PV system is even a complex issue for experienced
plant designers and installers. Parameters such as system size and exposure to sunlight (affects of shade, panel
orientation, etc.) are only the most important criteria during the selection of the right inverter concept. With the new and
in Europe not previously used micro inverter concept, hence, the decision for the right concept is even more difficult.
Thereby, the selection of a wrong concept causes unnecessary energy yield losses and increases the total cost of
ownership (TCO) of the PV system.
The result of this work is a toolbox for all PV systems planners and installers, which can be used to chose the optimal
inverter concept (string, multi-string, micro) for each PV system individually.
Sophisticated Energy Management for Optimizing the PV Grid Integration
Creators: name: Beister, D.
Publisher: name: WIP
Year: 2012
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 4101-4104
description: To be able to replace conventional power plants with PV plants maintaining the security of energy
supply, distributed renewable energy resources need to be integrated into the electricity grid as seamless as possible.
Up to a certain extend this can even avoid future grid extensions. This paper describes how photovoltaic (PV) plants
support the grid using a local energy management system (EMS) optimizing the correlation between PV generation
and load demand. You will read about PV plants providing valuable data for precise PV power extrapolations and
forecasts, about EMS performing automatic appliance control depending on surplus PV energy and variable energy
tariffs, about an intelligent usage of intermediate energy storage to harness solar electricity for later usage and further
smooth the fluctuating PV profile, and about PV inverters being part of the local grid management. All of this result
in a win-win-situation: The grid is relieved and customers enjoy financial benefits through optimized PV selfconsumption,
ideal usage of variable energy tariffs, and a mitigated impact of potential power curtailments.
Deformation-induced phase transformation and twinning in Fe and Fe–C alloys
Creators: name: Yang, Yang
name: Zhang, Hao
name: Ou, Xiaoqin
name: Gu, Ji
name: Song, Min
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Physical Sciences not elsewhere classified
subject: Cell Biology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Marine Biology
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: The phase transformations and twinning in a nano-sized face-centred cubic (FCC) crystal of iron with different carbon contents are studied by molecular dynamic (MD) simulations. The simulation cells are stretched uniaxially along the [100]FCC direction. It is found that the FCC matrix transforms into the body-centred cubic (BCC) phase following the Nishiyama–Wassermann orientation relationship (OR). Then, the ‘BCC↔hexagonal close-packed (HCP)’ and ‘BCC↔FCC’ transformations occur following different variants of the Burgers OR and the Pitsch OR, respectively. The {112}BCC twins form between two neighbouring BCC grains. Additionally, the carbon atoms can destabilise the BCC phase, inhibit the phase transformation and pin phase interfaces, leading to tiny BCC twins.
Optimizing System Size for Inverters with More than One Maximum Power Point Tracking DC Input
Creators: name: McKeen, J.C.
name: Pisklak, S.
name: Quinn, C.
Publisher: name: WIP
Year: 2012
Subjects: Components for PV Systems
Balance of System Components

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 3669-3672
description: While a limited number of commercially available inverters have more than one DC, maximum power
point tracking input, freely available system modeling software does not allow a system designer to accurately
simulate hourly production for more than one MPPT input. The traditional approach of treating strings independently,
summing the maximum derated DC watts fed to the inverter, and following the manufacturers recommendation
(typically 0.95 – 1.25 Wp/Wac) for array sizing can easily lead the designer to undersize an array for a given inverter
capacity. This is particularly true if strings have non equivalent azimuth angles or non equivalent pitches as
frequently occur in residential construction. To allow designers to accurately size POWERHOUSETM solar shingle
arrays and estimate yearly production values, a simulator has been developed that treats each MPPT input
individually and on an hourly basis. The energy capture from each MPPT input is then summed at the bulk inversion
stage. Efficiency of the buck/boost MPPT stage is decoupled from the efficiency of the AC/DC inversion state to treat
situations of drastically different string lengths or irradiance, without having to make inaccurate assumptions about
overall inverter efficiency.
A new integrable generalization of the Korteweg - de Vries equation
Creators: name: Karasu-Kalkanli, Ayse
name: Karasu, Atalay
name: Sakovich, Anton
name: Sakovich, Sergei
name: Turhan, Refik
Publisher: name: arXiv
Year: 2007
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: A new integrable sixth-order nonlinear wave equation is discovered by means of the Painleve analysis, which is equivalent to the Korteweg - de Vries equation with a source. A Lax representation and a Backlund self-transformation are found of the new equation, and its travelling wave solutions and generalized symmetries are studied.
description: 13 pages, 2 figures
Arc Fault Detection in PV Systems – A Minimum Requirement Also for Europe?
Creators: name: Häring, A.
name: Bieniek, S.
name: Bettenwort, G.
Publisher: name: WIP
Year: 2012
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 4002-4005
description: The introduction of Arc-Fault-Circuit-Interrupter (AFCI) in the US market leads to the question if the
introduction in Europe is necessary as well. A comparison shows the differences between US and European PV
systems in the arc fault potential as well as in the consequences of damage. Together with an additional consideration
about reliability and costs a base for discussions can be created about the need for AFCIs, based on the local or
national conditions.
On the one hand the work has shown that the risks between US and European PV systems are completely different.
There are significant differences in the arc fault potential as well as in the consequences of damage. On the other
hand the use of AFCIs also depends on their costs, reliability and immunity against disturbances.
The necessity for an AFCI is affected by several aspects. Depending on the risks, reliability, immunity of AFCIs
against disturbances and costs a clear picture can be created about the need for AFCIs, based on the local or national
conditions.
Extended Slow-Roll Conditions and Rapid-Roll Conditions
Creators: name: Chiba, Takeshi
name: Yamaguchi, Masahide
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive slow-roll conditions for a scalar field which is non-minimally coupled with gravity in a consistent manner and express spectral indices of scalar/tensor perturbations in terms of the slow-roll parameters. The conformal invariance of the curvature perturbation is proved without linear approximations. Rapid-roll conditions are also derived, and the relation with the slow-roll conditions is discussed.
description: 15 pages, published version
Point-contact spectroscopy of the antiferromagnetic superconductor HoNi2B2C in the normal and superconducting state
Creators: name: Naidyuk, Yu. G.
name: Kvitnitskaya, O. E.
name: Yanson, I. K.
name: Fuchs, G.
name: Nenkov, K.
name: Waelte, A.
name: Behr, G.
name: Souptel, D.
name: Drechsler, S. -L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Point-contact (PC) spectroscopy measurements on antiferromagnetic (AF) (T_N=5.2K) HoNi2B2C single crystals in the normal and two different superconducting (SC) states (T_c=8.5K and $T_c^*=5.6K) are reported. The PC study of the electron-boson(phonon) interaction (EB(P)I) spectral function reveals pronounced phonon maxima at 16, 22 and 34meV. For the first time the high energy maxima at about 50meV and 100meV are resolved. Additionally, an admixture of a crystalline-electric-field (CEF) excitations with a maximum near 10meV and a `magnetic` peak near 3meV are observed. The contribution of the 10-meV peak in PC EPI constant λ_PC is evaluated as 20-30%, while contribution of the high energy modes at 50 and 100meV amounts about 10% for each maxima, so the superconductivity might be affected by CEF excitations. The SC gap in HoNi2B2C exhibits a standard single-band BCS-like dependence, but vanishes at $T_c^*=5.6K
description: 11 pages, 8 figs, to be published in PRB, Vol.75, Iss.21
Recombination Process of Photogenerated Charge Carriers in Polycrystalline CIGS as Studied by Microwave Photoconductivity Technique
Creators: name: Novikov, G.
name: Bocharov, K.
name: Hsieh, T.-Y.
name: Jeng, M.-J.
Publisher: name: WIP
Year: 2012
Subjects: Thin Film Solar Cells
CdTe, CIS and Related Ternary and Quaternary Thin Film Solar Cells

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 2851-2855
description: The loss kinetics of photo generated charge carriers was studied by time resolved microwave (36GHz) photoconductivity technique (TRMC) in polycrystalline chalcopyrite films. Measurements were carried out at temperature range 148-293 K. Amplitude of TRMC response linearly depended on crystallite size calculated from xray
diffraction data (i.e. on the size of the area of coherent scattering, ACS). The decay law of TRMC was hyperbolic function. The half decay time of TRMC increased with decrease of both light intensity and temperature. It was shown that recombination process of the free holes with trapped electrons is very effective near ACS’s boundaries.
Electroweak Symmetry Breaking in the E6SSM
Creators: name: Athron, Peter
name: King, S. F.
name: Miller, D. J.
name: Moretti, S.
name: Nevzorov, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Exceptional Supersymmetric Standard Model (E6SSM) is an E6 inspired model with an extra gauged U(1) symmetry, which solves the mu-problem in a similar way to the NMSSM but without the accompanying problems of singlet tadpoles or domain walls. It predicts new exotic particles at the TeV scale. We investigate the Renormalisation Group Evolution of the model and test electroweak symmetry breaking for a selection of interesting scenarios with non-universal Higgs masses at the GUT scale. We present a detailed particle spectrum that could be observed at the LHC.
description: Talk given at the 2007 Europhysics Conference on High Energy Physics, Manchester, England, 19-25 July 2007