cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Round Robin: Quantitative Lateral Resolution of PHI XPS microprobes Quantum 2000 / Quantera SXM
Creators: name: Scheithauer, U.
name: Kolb, M.
name: Kip, G. A. M.
name: Naburgh, E.
name: Snijders, J. H. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The quantitative lateral resolution is a reliable measure for the quality of an XPS microprobe equipped with a focused X-ray beam. It describes the long tail contributions of the X-ray beam intensity distribution. The knowledge of these long tail contributions is essential when judging on the origin of signals of XPS spectra recorded on small-sized features. In this round robin test the quantitative lateral resolution of 7 PHI XPS microprobes has been estimated. As expected, the quantitative lateral resolution has significantly larger values than the nominal X-ray beam diameter. The estimated values of the quantitative lateral resolution follow a trend in time: The newer the monochromator of an XPS microprobe so much the better the quantitative lateral resolution.
description: 7 pages, 3 figures, 1 table
On an isoperimetric problem on the Lobachevsky hyperbolic plane with left-invariant Finsler structure
Creators: name: Myrikova, Viktoria
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49J15, 53B40

description: We deal with an isoperimetric problem on the Finsler hyperbolic plane. The space is defined as the Lie group of proper affine transformations of the line with a left-invariant Finsler structure. To state the problem, we use the left-invariant volume form. The optimal isoperimetric loops are found in terms of convex trigonometry functions. We also propose a generalization of the isoperimetric inequality in parametric form.
description: 17 pages, 2 figures, in Russian
Calculation of the Quasi Fermi-Level Splitting in an Ideal Superlattice of Silicon Nanocrystals
Creators: name: Müller, R.
name: Löper, P.
name: Hiller, D.
name: Gutsch, S.
name: Keding, R.
name: Reichel, C.
name: Bivour, M.
name: Hermle, M.
name: Janz, S.
name: Goldschmidt, J.C.
name: Zacharias, M.
name: Glunz, S.W.
Publisher: name: WIP
Year: 2011
Subjects: Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
New Materials, Cells and Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 465-469
description: The splitting of the quasi Fermi-levels under illumination constitutes an upper limit for the open circuit
voltage of a silicon nanocrystal solar cell. To determine this splitting, the band structure and the density of states of a
superlattice of cubic silicon quantum dots is calculated. Furthermore, the absorption and the minority charge carrier
lifetime of a sample with silicon nanocrytsals in a silicon dioxide matrix are measured. From these data the excess
carrier density under illumination with the AM1.5G solar spectrum is estimated to be about 1014
cm-3. Based on the
density of states and the carrier concentration, the quasi Fermi-levels are calculated. Superlattices of silicon
nanocrystals in SiO2, Si3N4 and SiC are compared. It is found that under AM1.5G illumination the splitting of the
quasi Fermi-levels follows the calculated band gap with an offset of about 0.6 eV because the integrated density of
states in the first miniband is always much higher than the excess carrier density. This is quite independent from the
quantum dot size, interdot distance and matrix material. A 100 fold increase of charge carrier generation by e.g. light
trapping or concentration enhances the quasi Fermi-level splitting by 0.24 eV.
First-principles calculation of anomalous Hall and Nernst conductivity by local Berry phase
Creators: name: Sawahata, Hikaru
name: Yamaguchi, Naoya
name: Minami, Susumu
name: Ishii, Fumiyuki
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this study, we implemented a finite-difference algorithm for computing anomalous Hall and Nernst conductivity. Based on the expression to evaluate the Berry curvature in an insulating system [J. Phys. Soc. Jpn. 74 1674(2005)], we extended the methods to a metallic system. We calculated anomalous Hall conductivity and Nernst conductivity in a two-dimensional ferromagnetic material FeCl$_2$ and three-dimensional ferromagnetic transition metals bcc-Fe, hcp-Co, and fcc-Ni. Our results are comparable to previously reported results computed by Kubo-formula or Wannier representation. To evaluate anomalous Nernst coefficients, the detailed Fermi-energy dependence of the anomalous Hall conductivity is required. Nonetheless, previous methods based on Wannier representation or Kubo-formula have numerical instability due to the ${\boldsymbol k}$-space Dirac monopole. The present method will open an efficient thermoelectric material design based on the high-throughput first-principles screening.
description: 7 pages, 4 figures
Issues When Comparing Indoors and Outdoors I-V Curve Measurements of New Technology Photovoltaic (PV) Modules
Creators: name: Vela, N.
name: Alonso-García, M.C.
name: Fabero, F.
name: Martín Chivelet, N.
name: Chenlo, F.
Publisher: name: WIP
Year: 2011
Subjects: Components for PV Systems
PV Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3434-3437
description: This work presents the differences found when measuring indoors and outdoors different technology
I-V curves, including high efficiency modules and thin film ones. Samples of m-Si back contact, a-Si/m-Si
heterojunction and CIS photovoltaic modules have been analyzed. m-Si back contact and a-Si/m-Si heterojunction
samples present higher powers in outdoor measurements. These differences can be reduced by increasing the indoor
sweeping time. For the case of CIS module increasing the sweeping time don’t affect the I-V curve measurements,
and other factors such us activation or preconditioning could influence the different response.
Inelastic vibrational signals in electron transport across graphene nanoconstrictions
Creators: name: Gunst, Tue
name: Markussen, Troels
name: Stokbro, Kurt
name: Brandbyge, Mads
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present calculations of the inelastic vibrational signals in the electrical current through a graphene nanoconstriction. We find that the inelastic signals are only present when the Fermi-level position is tuned to electron transmission resonances, thus, providing a fingerprint which can link an electron transmission resonance to originate from the nanoconstriction. The calculations are based on a novel first-principles method which includes the phonon broadening due to coupling with phonons in the electrodes. We find that the signals are modified due to the strong coupling to the electrodes, however, still remain as robust fingerprints of the vibrations in the nanoconstriction. We investigate the effect of including the full self-consistent potential drop due to finite bias and gate doping on the calculations and find this to be of minor importance.
Second-harmonic generation from singular metasurfaces
Creators: name: Yang, Fan
name: Ciracì, Cristian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a theoretical study of second-harmonic generation from a singular metasurface. The singular metasurfaces strongly interact with the incident light, where the large field enhancement forms an intense surface polarization that generates the second-harmonic field. By using transformation optics, the calculation of nonlinear optical response is converted from the metasurface frame to that of a simple slab geometry, largely reducing the complexity of the problem. In addition, the singular metasurface exhibits a weak dependence on the incident angle of light, which can be potentially used as an all-angle device for harmonic generations. Finally, we study the symmetry dependence of second-harmonic generation in the far field for the singular metasurface and show how to enhance the conversion efficiency under normal incidence by breaking the surface inversion symmetry.
description: 23 pages, 7 figures
Conditional reversibility in nonequilibrium stochastic systems
Creators: name: Bonança, Marcus V. S.
name: Jarzynski, Christopher
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: For discrete-state stochastic systems obeying Markovian dynamics, we establish the counterpart of the conditional reversibility theorem obtained by Gallavotti for deterministic systems [Ann. de l'Institut Henri Poincaré (A) 70, 429 (1999)]. Our result states that stochastic trajectories conditioned on opposite values of entropy production are related by time reversal, in the long-time limit. In other words, the probability of observing a particular sequence of events, given a long trajectory with a specified entropy production rate $σ$, is the same as the probability of observing the time-reversed sequence of events, given a trajectory conditioned on the opposite entropy production, $-σ$, where both trajectories are sampled from the same underlying Markov process. To obtain our result, we use an equivalence between conditioned ("microcanonical") and biased ("canonical") ensembles of nonequilibrium trajectories. We provide an example to illustrate our findings.
description: 13 pages, 1 figure
Comparison of Electrical Modeling for CI(G)S Thin-Film Solar Modules Operating under Various Outdoor Conditions
Creators: name: Werner, B.A.
name: Huld, T.
name: Kenny, R.P.
name: Zdanowicz, T.
Publisher: name: WIP
Year: 2011
Subjects: Components for PV Systems
PV Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3442-3445
description: In this paper we present results of electrical modeling of CI(G)S thin-film photovoltaic (PV) modules located in two
different geographical locations – Wrocław in Poland and Ispra in Italy. Electrical parameters were obtained from
fitting the large amount of data (i.e. I-V curves) acquired during long-term outdoor monitoring of commercially
available modules with use of a double diode equivalent electrical model. Based on an approximation process, two
model parameters were chosen for further analysis: diffusion IS1 and recombination IS2 related components of dark
diode saturation current. Energy band gap Eg values were calculated for both of PV modules. Determined parameters,
together with equations describing the processes of diffusion/recombination in p-n junction and coming from
previous investigation of material parameters, were used to model new values of IS1 and IS2. These replace values that
were previously approximated with the double diode equivalent model. It allows us to predict measured I-V curves
and – what is more – to determine electrical parameters for further analysis and simulations.
Scotina Menge 1873
Creators: name: Seo, Bo
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Liocranidae
Scotina

description: Genus Scotina Menge, 1873 (Korean name: Jom-bat-go-rang-geo-mi) Scotina Menge, 1873: 337. Type species: A. gracilipes (Blackwall, 1859). This genus resembles Agroeca closely. The different points are as follows: Tibiae I with six to ten pairs of ventral spines and Metatarsi I with three to seven pairs of ventral spines (Locket & Millidge 1951).
description: Published as part of Seo, Bo, 2011, Description of three liocranid spider species from Korea (Araneae: Liocranidae), pp. 98-102 in Entomological Research 41 (1) on page 101, DOI: 10.1111/j.1748-5967.2011.00326.x, http://zenodo.org/record/584023
description: {"references": ["Menge A (1873) Preussische Spinnen. VI. Abtheilung. Schriften der Naturforschenden Geselschaft in Danzig (Neue Folge) 3: 327 - 374.", "Blackwall J (1859) Descriptions of six recently discovered species, and characters of a new genus of Araneida. Annals and Magazine of Natural History 3 (3): 91 - 98.", "Locket GH, Millidge AF (1951) British Spiders, Vol. 1. Ray Society, London."]}
Quantum Capacity and Vacuum Compressibility of Spacetime: Thermal Fields
Creators: name: Cho, Hing-Tong
name: Hsiang, Jen-Tsung
name: Hu, Bei-Lok
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An important yet perplexing result from work in the 90s and 00s is the near-unity value of the ratio of fluctuations in the vacuum energy density of quantum fields to the mean in a collection of generic spacetimes. This was done by way of calculating the noise kernels which are the correlators of the stress-energy tensor of quantum fields. In this paper we revisit this issue via a quantum thermodynamics approach, by calculating two quintessential thermodynamic quantities: the heat capacity and the quantum compressibility of some model geometries filled with a quantum field at high and low temperatures. This is because heat capacity at constant volume gives a measure of the fluctuations of the energy density to the mean. When this ratio approaches or exceeds unity, the validity of the canonical distribution is called into question. Likewise, a system's compressibility at constant pressure is a criterion for the validity of grand canonical ensemble. We derive the free energy density and, from it, obtain the expressions for these two thermodynamic quantities for thermal and quantum fields in 2d Casimir space, 2d Einstein cylinder and 4d ($S^1 \times S^3$ ) Einstein universe. To examine the dependence on the dimensionality of space, for completeness, we have also derived these thermodynamic quantities for the Einstein universes with even-spatial dimensions: $S^1 \times S^2$ and $S^1 \times S^4$. With this array of spacetimes we can investigate the thermodynamic stability of quantum matter fields in them and make some qualitative observations on the compatibility condition for the co-existence between quantum fields and spacetimes, a fundamental issue in the quantum and gravitation conundrum.
description: 47 pages
Multi-Crystalline Silicon Based Heterojunction Solar Cells
Creators: name: Tucci, M.
name: De Iuliis, S.
name: Serenelli, L.
name: Izzi, M.
name: Summonte, C.
name: Canino, M.
name: Allegrezza, M.
name: Rosa, M.
name: De Cesare, G.
name: Caputo, D.
name: Boncompagni, G.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 2121-2125
description: Heterojunction solar cells are fabricated on 1 Ωcm boron or phosphorus doped multicrystalline silicon
wafers. As-cut material is treated by industrial isotexturing and home-made acidic texturing in order to obtain
textured surfaces, as well as CP4 and modified CP6 chemical polishing, in order to obtain reference samples. A
double a-Si:H/c-Si is deposited by Plasma Enhanced Chemical Vapour Deposition to sandwich the substrate, at the
sunward surface to form the emitter and at the rear side to act as back surface field. High open-circuit current (625
mV) is obtained on flat p-type mc-Si, whereas commercial acidic surface treatment, commonly used in diffused
junction mc-Si solar cell fabrication, requires a level of passivation which is not easily achievable using the very thin
a-Si:H film needed in heterojunction technology. On n-type substrates, conversion efficiency around 12% is found,
despite low VOC values. The effectiveness of a-Si:H/mc-Si technology in achieving high photovoltaic efficiency
using low thermal budget manufacturing process is demonstrated.
Electron doping evolution of the magnetic excitations in NaFe$_{1-x}$Co$_x$As
Creators: name: Carr, Scott V.
name: Zhang, Chenglin
name: Song, Yu
name: Tan, Guotai
name: Li, Yu
name: Abernathy, D. L.
name: Stone, M. B.
name: Granroth, G. E.
name: Perring, T. G.
name: Dai, Pengcheng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We use time-of-flight (ToF) inelastic neutron scattering (INS) spectroscopy to investigate the doping dependence of magnetic excitations across the phase diagram of NaFe$_{1-x}$Co$_x$As with $x=0, 0.0175, 0.0215, 0.05,$ and $0.11$. The effect of electron-doping by partially substituting Fe by Co is to form resonances that couple with superconductivity, broaden and suppress low energy ($E\le 80$ meV) spin excitations compared with spin waves in undoped NaFeAs. However, high energy ($E> 80$ meV) spin excitations are weakly Co-doping dependent. Integration of the local spin dynamic susceptibility $χ^{\prime\prime}(ω)$ of NaFe$_{1-x}$Co$_x$As reveals a total fluctuating moment of 3.6 $μ_B^2$/Fe and a small but systematic reduction with electron doping. The presence of a large spin gap in the Co-overdoped nonsuperconducting NaFe$_{0.89}$Co$_{0.11}$As suggests that Fermi surface nesting is responsible for low-energy spin excitations. These results parallel Ni-doping evolution of spin excitations in BaFe$_{2-x}$Ni$_x$As$_2$, confirming the notion that low-energy spin excitations coupling with itinerant electrons are important for superconductivity, while weakly doping dependent high-energy spin excitations result from localized moments.
description: 14 pages, 16 figures
Asymptotic of the Discrete Volume-Preserving Fractional Mean Curvature Flow via a Nonlocal Quantitative Alexandrov Theorem
Creators: name: Daniele, De Gennaro
name: Kubin, Andrea
name: Kubin, Anna
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We characterize the long time behaviour of a discrete-in-time approximation of the volume preserving fractional mean curvature flow. In particular, we prove that the discrete flow starting from any bounded set of finite fractional perimeter converges exponentially fast to a single ball. As an intermediate result we establish a quantitative Alexandrov type estimate in the fractional setting for normal deformations of a ball. Finally, we provide existence for flat flows as limit points of the discrete flow when the time discretization parameter tends to zero.
description: Added acknowledgements, corrected some typos
Influence of Surface Conditioning and Passivation Schemes on the Internal Rear Reflectance of Bulk Silicon Solar Cells
Creators: name: Lorenz, A.
name: John, J.
name: Vermang, B.
name: Poortmans, J.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 2059-2061
description: The substrate thickness of bulk silicon solar cells is decreasing and will be decreasing even further in
the future due to cost reasons. The reduction of substrate thickness using a full aluminum metallization on the rear
causes problems because of increasing bowing of the cells due to mechanical stress during firing. In addition, the
moderate quality of the Al back surface field (BSF) results in lower cell performance as one uses thinner substrates.
Rear emitter passivated bulk silicon solar cells (PERC) can be a solution to these issues. Besides the elimination of
the bowing, they offer two important features. The surface recombination velocity is decreased and the internal rear
reflectance is enhanced. Both lead to improved cell performance. To distinguish their influence, in this contribution
the rear reflectance of various test structures is compared. Since for PERC cells decoupled surfaces are necessary to
be able to reach good passivation properties, the influence of the surface treatment is studied. In addition the
influence of various dielectric and dielectric/metal stacks is characterized. An increased rear reflectance increase of
about 2 – 3 % is observed if the rear surface is polished compared to a textured surface. An additional increase of
reflectance of about 3% is observed when using aluminum on top of the dielectric stacks reaching values of up to
99 %.
Transparent Conductive Polymers for Solar Cell Current Collecting System
Creators: name: Chebotareva, A.
name: Untila, G.
name: Kost, T.
name: Lachinov, A.N.
name: Kornilov, V.M.
name: Salazkin, S.N.
name: Shaposhnikova, V.V.
Publisher: name: WIP
Year: 2011
Subjects: Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
New Materials, Cells and Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 450-453
description: Transparent conducting polymer films are used to attach current collecting grid of wire to silicon solar
cell surface covered by antireflection TCO layer in Laminated Grid Solar Cell (LGCell) construction during low
temperature lamination step. The polymer layer provides good cross conductivity, but having dielectric properties in
the longitudinal direction. In our previous works among the possible candidates to form stable LGCell current
collecting system, conductive polymers based on polyarylenes (thermoreactive polymers and thermoplastics) were
considered. In the present work the synthesis of new conducting transparent polymeric materials, based on vinyflex
with curing temperature (160÷1800С) was performed. A new synthesized polymeric films (VF1, VF7, VF8) provided
contact resistivities < 2 mΩ·cm2 in the system Metal /Polymer film/TCO, and polymer VF1 showed the lowest
contact resistivity (0.2÷0.4 mΩ·cm2). The new thermoplastics showed the highest transmittance in the visible region
among the all tested polymers. LGCells with transparent conducting polymer VF1 were made on IFO/(n+pp+)Cz-
Si/Al structures. Applying the best among the tested conductive thermoplastics (composition VF1) in LGCell contact
system leaded to the increase of the conversion parameters of LGCell based on Cz-Si in comparison with original
LGCell metallization (lamination film/rolled soldered wires/TCO): the rise of Voc in 4 mV and the increase of Jsc in
0.4 mA/cm2 resulted in efficiency 18.7% instead of 18.5%
Charge transfer and electron-phonon coupling in monolayer FeSe on Nb doped SrTiO$_3$
Creators: name: Zhou, Yuanjun
name: Millis, Andrew J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Monolayer films of FeSe grown on SrTiO$_3$ substrates are electron doped relative to bulk and exhibit a significantly higher superconducting transition temperatures. We present density functional calculations and a modified Schottky model incorporating the strong paraelectricity of SrTiO$_3$ which demonstrate that the doping may be due to charge transfer from SrTiO$_3$ impurity bands driven by work function mismatch. Physically relevant levels of Nb doping are shown to lead to doping of the FeSe compatible with observation. The coupling of electrons in FeSe to polar phonons in the depletion regime of the SrTiO$_3$ is calculated. A $λ\sim 0.4$ is found; the coupling to long-wavelength phonons is found to be dominant.
description: 8 pages, 4 figures
D7.6: Report on synergetic activities inside the portfolio of SC05-11-2018 projects
Creators: name: Amorsi, Natacha
Publisher: name: Zenodo
Year: 2022

description: The EU H2020 call SC5-11-2018 was entitled: « Digital solutions for water: linking the physical and digital world for water solutions ». Four projects were funded out of this: digital-water.city, ScoreWater, Fiware4Water and Naiades. Given the theme of the call, it was expected that the four projects had a lot in common in their scope, goals and innovation content. All the above four projects started at the same time, in June 2019. During the preparation of the Grant Agreement (GA), EASME suggested that these four projects should team up and develop synergies and common activities, so as to facilitate cooperation and enhance the impact of each project. This suggestion was included as contractual obligation for the four projects, i.e. that there would be two common deliverables, describing the synergies and cooperation of this group. At the same time, another EU call, namely H2020-SU-SEC-2018-DRS-03 “Pre-normative research and demonstration for disaster-resilient societies” supported the funding of the project aqua3S. Given the thematic proximity between the two calls, it was suggested to “adopt” aqua3S as standalone project into the group of the four sister projects. Thus the group increased in size, comprising now five projects (4+1), with interests and activities in common around “digital water” themes and organized itself as the DigitalWater2020 (DW2020) group. DW2020 is organized along five thematic areas / Task Forces (TF): Ontologies, Sensors demonstration, Business models, Communication and Policy, each with its own Task Force leader. Additionally a sixth task force (Task Force 0: Management) has been created, to coordinate the efforts and activities overall. Participation in the task forces is voluntary for the partners and researchers involved in the five projects, based on their interests and the specific tasks they are involved in their respective projects. The goal of the task forces is to do “real” work, with several regular teleconferences, investigating common problems and approaches, helping each other, exchanging knowledge to avoid “re-inventing the wheel” for specific challenges. Consequently several early career researchers are actively involved, together with more experienced older researchers, benefiting all from the knowledge exchange that takes place on a regular basis. A first deliverable submitted in May 2020 (Synergies inside the portfolio of SC05-11-2018 projects) presented the scope and ambition of the group. The report 1) identified potential synergies between the above mentioned projects, 2) highlighted common scope of work and complementarities and 3) presented the structure of the Synergy group DW2020. Building on the previous deliverable, this second report aims at presenting the concrete activities of the task forces as well as summarizing the main outcomes obtained in the frame of the collaboration. Finally, it outlines the next steps for each task force and how the synergetic activities might be continued at the end of the projects.
Bound on optimal local discrimination of multipartite quantum states
Creators: name: Ha, Donghoon
name: Kim, Jeong San
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the unambiguous discrimination of multipartite quantum states and provide an upper bound for the maximum success probability of optimal local discrimination. We also provide a necessary and sufficient condition to realize the upper bound. We further establish a necessary and sufficient condition for this upper bound to be saturated. Finally, we illustrate our results using examples in multidimensional multipartite quantum systems.
description: 12 pages, no figure
Rapport d'activité 2022 des bibliothèques de l'université de Bourgogne
Creators: name: Husson Éric
Publisher: name: Zenodo
Year: 2023
Subjects: Rapport d'activité
Evaluation
Bibliothèques

description: Rapport d'activité 2022 du Pôle documentation (SCD) de l'université de Bourgogne
Absolute neutrino mass scale and dark matter stability from flavour symmetry
Creators: name: Chuliá, Salvador Centelles
name: Cepedello, Ricardo
name: Medina, Omar
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore a simple but extremely predictive extension of the scotogenic model. We promote the scotogenic symmetry $\mathbb{Z}_2$ to the flavour non-Abelian symmetry $Σ(81)$, which can also automatically protect dark matter stability. In addition, $Σ(81)$ leads to striking predictions in the lepton sector: only Inverted Ordering is realised, the absolute neutrino mass scale is predicted to be $m_\text{lightest} \approx 7.5 \times 10^{-4}$ eV and the Majorana phases are correlated in such a way that $|m_{ee}| \approx 0.018$ eV. The model also leads to a strong correlation between the solar mixing angle $θ_{12}$ and $δ_{CP}$, which may be falsified by the next generation of neutrino oscillation experiments. The setup is minimal in the sense that no additional symmetries or flavons are required.
description: 19 pages, 6 figures, 1 Table. v2: Additional comments about flavour symmetry breaking, FCNCs, and dark matter were added, also an Appendix concerning the scalar sector was included. This document matches the published version
Fluorescence Emission Study of CdSe/ZnS Quantum Dot and Au Nanoparticles Composite for Application in Quantum Dot Solar Concentrators
Creators: name: Chandra, S.
name: Kennedy, M.
name: Doran, J.
name: McCormack, S.J.
name: Chatten, A.J.
Publisher: name: WIP
Year: 2011
Subjects: Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
New Materials, Cells and Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 411-414
description: Fluorescence of core shell (CdSe/ZnS) quantum dots (QDs) and Au nanoparticles (NPs) composite has
been studied for application in quantum dot solar concentrators (QDSC). We conclude two points from the particular
QD/Au NP composite studied. One; for the particular Au NPs concentration, the relative fluorescence emission
enhancement increases with decreasing QD concentration. Second; the enhancement is more pronounced for the Au
nanoparticles whose surface plasmon resonance wavelength overlaps with the absorption peak of QDs. The fundamental
concept that could describe the change in fluorescence emission of QDs in the presence of Au NPs is the locally
enhanced electromagnetic field induced by the surface plasmon resonance in the Au NPs. This leads to change in
absorption, excitation and emission rate of the QDs. The optimal concentration depends on the coupling and spacing
between neighbouring QDs and Au NPs.
Data-driven reduced-order modeling for nonautonomous dynamical systems in multiscale media
Creators: name: Li, Mengnan
name: Jiang, Lijian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 65N99, 65N30, 68T09, 35K55

description: In this article, we present data-driven reduced-order modeling for nonautonomous dynamical systems in multiscale media using Koopman operators. Different from the case of autonomous dynamical systems, the Koopman operator family of nonautonomous dynamical systems significantly depend on a time pair. In order to effectively estimate the time-dependent Koopman operators, a moving time window is used to decompose the snapshot data, and the extended dynamic mode decomposition method is applied to computing the Koopman operators in each local temporal domain. Many physical properties in multiscale media often vary in very different scales. In order to capture multiscale information well, the dimension of collected data may be high. To accurately construct the models of dynamical systems in multiscale media, we use high spatial dimension of observation data. It is challenging to compute the Koopman operators using the very high dimensional data. Thus, the strategy of reduced-order modeling is proposed to treat the difficulty. The proposed reduced-order modeling includes two stages: offline stage and online stage. In offline stage, a block-wise low rank decomposition is used to reduce the spatial dimension of initial snapshot data. For the nonautonomous dynamical systems, real-time observation data may be required to update the Koopman operators. The online reduced-order modeling is proposed to correct the offline reduced-order modeling. Three methods are developed for the online reduced-order modeling: fully online, semi-online and adaptive online. The adaptive online method automatically selects the fully online or semi-online and can achieve a good trade-off between modeling accuracy and efficiency.
description: 34 pages
Properties of heavy rare-gases adlayers on graphene substrates
Creators: name: Madeira, Lucas
name: Vitiello, Silvio A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigated properties of heavy rare-gases, Ne, Ar, Kr, Xe and Rn, adsorbed on graphene substrates using molecular dynamics. We gathered evidences of commensurate solids for Ne and Kr adlayers, one of them is given by a typical behavior of the nearest neighbor distance of the adatoms. The specific heat and the melting temperature were calculated and both indicate continuous melting for all heavy noble-gases studied. We also determined the distance between the adlayer and the substrate.
description: 9 pages, 13 figures
An Improved Authentication Scheme for BLE Devices with no I/O Capabilities
Creators: name: Gupta, Chandranshu
name: Varshney, Gaurav
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Bluetooth Low Energy (BLE) devices have become very popular because of their Low energy consumption and hence a prolonged battery life. They are being used in smart wearable devices, smart home automation system, beacons and many more areas. BLE uses pairing mechanisms to achieve a level of peer entity authentication as well as encryption. Although, there are a set of pairing mechanisms available but BLE devices having no keyboard or display mechanism (and hence using the Just Works pairing) are still vulnerable. In this paper, we propose and implement, a light-weight digital certificate based authentication mechanism for the BLE devices making use of Just Works model. The proposed model is an add-on to the already existing pairing mechanism and therefore can be easily incorporated in the existing BLE stack. To counter the existing Man-in-The-Middle attack scenario in Just Works pairing (device spoofing), our proposed model allows the client and peripheral to make use of the popular Public Key Infrastructure (PKI) to establish peer entity authentication and a secure cryptographic tunnel for communication. We have also developed a lightweight BLE profiled digital certificate containing the bare minimum fields required for resource constrained devices, which significantly reduces the memory (about 90\% reduction) and energy consumption. We have experimentally evaluated the energy consumption of the device using the proposed pairing mechanism to demonstrate that the model can be easily deployed with less changes to the power requirements of the chips. The model has been formally verified using automatic verification tool for protocol testing.
Impact of Physician Performed Point of Care Ultrasound (POCUS) During first Outpatient Cardiology Consultation on Patient Management and Downstream Testing
Creators: name: Naqvi, Tasneem Z.
Publisher: name: Health Research Alliance
Year: 2024
Subjects: classificationCode: 320802
subject: Human biophysics
classificationCode: 320899
subject: Medical physiology not elsewhere classified

description:   
Background
Goal directed point of care ultrasound (POCUS) is a bedside tool to assist with clinical diagnosis. We examined the impact of POCUS performed by consulting cardiologist (CC) during initial cardiology consult on clinical management and downstream testing. 
Methods
69 study patients (pts) seen in a general cardiology outpatient clinic of a tertiary center by an expert imaging CC were compared to a control group of 65 pts seen by 3 different CCs without POCUS during the same time-period, in whom the first standard echo (SE) was performed after the initial visit.
Results
Baseline characteristics were similar between the two groups for age, cardiac risk factors, and referral diagnoses. Echo findings on POCUS and by SE (mean delay of 17.2 days after visit) in the control group were comparable for RV size and function and for valvular heart disease. More patients with lower LVEF, higher LV filling pressures, new regional wall motion abnormalities and increased aortic root size were present among POCUS group resulting in greater yield of echo abnormalities. There were more cardiovascular medication changes at the first visit (15.3% vs. 5.7%, p<0.01), less referral for noninvasive stress testing (10% vs. 29%, p<0.01), more advanced cardiac testing and subspecialty referrals (29% vs. 18% pts, p=0.06), in the study compared to the control group after cardiology visit. 
Conclusion
POCUS at time of consultation detects more abnormal echo findings, results in more medication adjustments, less referral for noninvasive stress testing, earlier referral for advanced cardiac diagnostic imaging and subspecialty cardiac referrals.
On the ground state energy of the inhomogeneous Bose gas
Creators: name: Bobrov, V. B.
name: Trigger, S. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Within the self-consistent Hartree-Fock approximation, an explicit expression for the ground state energy of inhomogeneous Bose gas is derived as a functional of the inhomogeneous density of the Bose-Einstein condensate. The results obtained are based on existence of the off-diagonal long-range order in the single-particle density matrix for systems with a Bose-Einstein condensate. This makes it possible to avoid the use of anomalous averages. The explicit form of the kinetic energy, which differs from one in the Gross-Pitaevski approach, is found. This form is valid beyond the Hartree-Fock approximation and can be applied for arbitrary strong interparticle interaction.
description: 4 pages, 0 figures
A Validation Study on Series Resistance Calculation According to IEC60891, ED 2.0
Creators: name: Polverini, D.
name: Tzamalis, G.
name: Müllejans, H.
Publisher: name: WIP
Year: 2011
Subjects: Components for PV Systems
PV Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3417-3420
description: The series resistance, Rs, of a PV module is a factor that can adversely affect its performance. Several
physical factors contribute to its value such as the bulk resistance of the semiconductor cell material, the metallic
interconnections and the junction box terminations. An accurate determination of Rs enables a quantitative
assessment of the impact of these factors on the module performance for an eventual performance optimization and
an estimate of its degradation. There are several experimental methods for determining Rs; the second edition (2009)
of the IEC60891 normative standard provides an iterative calculation procedure based on I-V curves measured at
different irradiances. We present a quantitative investigation of the impact of the standard’s calculation parameters on
the overall precision of the Rs calculation. We also analyze the Rs calculation approach of the IEC60891 first edition
(1987), highlighting how this formulation has a strong operator dependence.
Efficient Fine-Tuning of BERT Models on the Edge
Creators: name: Vucetic, Danilo
name: Tayaranian, Mohammadreza
name: Ziaeefard, Maryam
name: Clark, James J.
name: Meyer, Brett H.
name: Gross, Warren J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Resource-constrained devices are increasingly the deployment targets of machine learning applications. Static models, however, do not always suffice for dynamic environments. On-device training of models allows for quick adaptability to new scenarios. With the increasing size of deep neural networks, as noted with the likes of BERT and other natural language processing models, comes increased resource requirements, namely memory, computation, energy, and time. Furthermore, training is far more resource intensive than inference. Resource-constrained on-device learning is thus doubly difficult, especially with large BERT-like models. By reducing the memory usage of fine-tuning, pre-trained BERT models can become efficient enough to fine-tune on resource-constrained devices. We propose Freeze And Reconfigure (FAR), a memory-efficient training regime for BERT-like models that reduces the memory usage of activation maps during fine-tuning by avoiding unnecessary parameter updates. FAR reduces fine-tuning time on the DistilBERT model and CoLA dataset by 30%, and time spent on memory operations by 47%. More broadly, reductions in metric performance on the GLUE and SQuAD datasets are around 1% on average.
description: 4 pages, 2 figures, 3 tables. To be published in ISCAS 2022 and made available on IEEE Xplore
Energy Down Conversion Properties of Er3+- Yb3+ Co-Doped with Phosphorous on Oxidized Porous Silicon
Creators: name: Díaz-Herrera, B.
name: Jiménez-Rodríguez, E.
name: González-Diaz, B.
name: Montesdeoca-Santana, A.
name: Guerrero-Lemus, R.
name: Montes, C.
name: Linares, A.
name: Llarena, E.
name: González, O.
name: Molina, D.
name: Pío, A.
name: Friend, M.
name: Cendagorta, M.
Publisher: name: WIP
Year: 2011
Subjects: Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
New Materials, Cells and Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 394-397
description: In this work a study of the physical and down-conversion properties of Er3+- Yb3+ co-doped with
phosphorous on oxidized multi-crystalline (mc) porous silicon is presented. The chemically etched porous mc silicon
has been submitted to different chemical oxidation processes (in HNO3, H2O2 or H2SO4 solutions) at different
immersion times and to thermal processes also at different heating times and temperatures. The surface composition
of the treated samples and the lifetimes of minority charge carriers were measured. Co-doping processes of Er3+- Yb3+
with different ion ratios have been carried out at different temperatures and times. The photoluminescent results
indicate that the immersion in HNO3 and, also, the thermal oxidation at 800º C during 30 minutes are the most
suitable oxidations processes to enhance the luminescence of the ions and, consequently, the efficiency of solar cells
incorporating an Er-Yb down-conversion layer.
A dynamics-based density profile for dark haloes -- II. Fitting function
Creators: name: Diemer, Benedikt
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The density profiles of dark matter haloes are commonly described by fitting functions such as the NFW or Einasto models, but these approximations break down in the transition region where halos become dominated by newly accreting matter. Here we present a simple, accurate new fitting function that is inspired by the asymptotic shapes of the separate orbiting and infalling halo components. The orbiting term is described as a truncated Einasto profile, $ρ_{\rm orb} \propto \exp \left[-2/α (r / r_{\rm s})^α- 1/β (r / r_{\rm t})^β\right]$, with a five-parameter space of normalization, physically distinct scale and truncation radii, and $α$ and $β$, which control how rapidly the profiles steepen. The infalling profile is modelled as a power law in overdensity that smoothly transitions to a constant at the halo centre. We show that these formulae fit the averaged, total profiles in simulations to about 5% accuracy across almost all of an expansive parameter space in halo mass, redshift, cosmology, and accretion rate. When fixing $α= 0.18$ and $β= 3$, the formula becomes a three-parameter model that fits individual halos better than the Einasto profile on average. By analogy with King profiles, we show that the sharp truncation resembles a cut-off in binding energy.
description: 20 pages, 10 figures. Additional figures at http://www.benediktdiemer.com/data
A Very Cheap, Flexible and Retrofittable Method for the Low Irradiance Test
Creators: name: Pellegrino, M.
name: Adinolfi, G.
name: Flaminio, G.
name: Celano, K.
Publisher: name: WIP
Year: 2011
Subjects: Components for PV Systems
PV Modules

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3404-3407
description: Standards IEC 61215 and 61646 set that the purpose of “Performance at low irradiance” test is to
determine how the electrical performance of the module varies with load at 25 °C and at irradiance of 200 Wm-2
using natural sunlight or a simulator class BBB or better conforming to the requirements of IEC 60904-9, instead of
1000 Wm-2 standard conditions. The use the solar simulator is not possible since only by changing the power and
consequently modifying the intensity of the lamps the spectrum varies with the current passing through the lamps. So
a special device to change the irradiance to 200 Wm-2 is required and it shouldn’t affect the relative spectral
irradiance distribution and the spatial uniformity in accordance with IEC 60904-10. To this purpose the IEC 60904-
10 recommends the use of mesh filters or neutral density filters. Mesh filters are believed to be the best method for
large surfaces. But if the metallic mesh is put near the lamp house even the reference cell would be irradiated at the
low irradiance intensity and it is not easy to have a reference cell calibrated at 200 W/m2 and in anyway the light
would be almost completely scattered, making the measurement not completely realistic. The aim of this work is to
propose the use of a plastic film for an acceptable neutral reduction of the irradiation. It is cheap and can be
retrofitted to many existing simulators.
Proximity-induced zero-energy states indistinguishable from topological edge states
Creators: name: Califrer, Igor J.
name: Penteado, Poliana H.
name: Egues, J. Carlos
name: Chen, Wei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: When normal metals (NMs) are attached to topological insulators or topological superconductors, it is conceivable that the quantum states in these finite adjacent materials can intermix. In this case -- and because the NM usually does not possess the same symmetry as the topological material -- it is pertinent to ask whether zero-energy edge states in the topological layer are affected by the presence of the NM. To address this issue, we consider three prototype systems simulated by tight-binding models, namely a Su-Schrieffer-Heeger/NM, a Kitaev/NM, and a Chern insulator/NM. For all junctions investigated, we find that there exist trivial ``fine-tuned'' zero-energy states in the NM layer that can percolate into the topological region, thus mimicking a topological state. These zero-energy states are created by fine-tuning the NM chemical potential such that some of the NM states cross zero energy; they can occur even when the topological material is in the topologically trivial phase, and exist over a large region of the topological phase diagram. Interestingly, the true Majorana end modes of the Kitaev/NM model cannot be crossed by any NM state, as the NM metal layer in this case does not break particle-hole symmetry. On the other hand, when the chiral symmetry of the Su-Schrieffer-Heeger chain is broken by the attached NM, crossings are allowed. In addition, even in Chern insulators that do not preserve nonspatial symmetries, but the topological edge state self-generates a symmetry eigenvalue, such a fine-tuned zero-energy state can still occur. Our results indicate that when a topological material is attached to a metallic layer, one has to be cautious as to identify true topological edge states merely from their energy spectra and wave function profiles near the interface.
description: 9 pages, 6 figures