cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The spectrum of Schrödinger operators and Hodge Laplacians on conformally cusp manifolds
Creators: name: Golénia, Sylvain
name: Moroianu, Sergiu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35P20, 47A40, 58J40, 81Q10

description: We describe the spectrum of the $k$-form Laplacian on conformally cusp Riemannian manifolds. The essential spectrum is shown to vanish precisely when the $k$ and $k-1$ de Rham cohomology groups of the boundary vanish. We give Weyl-type asymptotics for the eigenvalue-counting function in the purely discrete case. In the other case we analyze the essential spectrum via positive commutator methods and establish a limiting absorption principle. This implies the absence of the singular spectrum for a wide class of metrics. We also exhibit a class of potentials $V$ such that the Schrödinger operator has compact resolvent, although $V$ tends to $-\infty$ in most of the infinity. We correct a statement from the literature regarding the essential spectrum of the Laplacian on forms on hyperbolic manifolds of finite volume, and we propose a conjecture about the existence of such manifolds in dimension four whose cusps are rational homology spheres.
description: Updated, 30 pages
Hydrosilane-Free Low-Cost APCVD of SiO2 Films for Crystalline Si Solar Cell Applications
Creators: name: Nagel, H.
name: Issa, E.
name: Nagel, T.
name: Glatthaar, M.
name: Glunz, S.W.
Publisher: name: WIP
Year: 2019
Subjects: Silicon Materials and Cells
Manufacturing & Production of Si Cells

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 419-422
description: A SiH4-free atmospheric pressure chemical vapor deposition (APCVD) technique was developed that provides a simple, flexible and cost-effective approach for the preparation of SiO2 coatings at room temperature. Microscopic investigations revealed that the deposited films are smooth and dense. No pinholes in the SiO2 coatings or gaps between the SiO2 and the substrate were found. On 245.7 cm² large Si wafers, the obtained SiO2 thickness variation was ± 10 %. After densification at 400 °C for a few minutes the layers are well suited for protective coatings in various applications. We successfully demonstrated i) single-side texturing of monocrystalline Si wafers and ii) elimination of parasitic metal deposition during electroplating of crystalline Si solar cells’ front side metallization.
Evaluation of Account Recovery Strategies with FIDO2-based Passwordless Authentication
Creators: name: Kunke, Johannes
name: Wiefling, Stephan
name: Ullmann, Markus
name: Iacono, Luigi Lo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Threats to passwords are still very relevant due to attacks like phishing or credential stuffing. One way to solve this problem is to remove passwords completely. User studies on passwordless FIDO2 authentication using security tokens demonstrated the potential to replace passwords. However, widespread acceptance of FIDO2 depends, among other things, on how user accounts can be recovered when the security token becomes permanently unavailable. For this reason, we provide a heuristic evaluation of 12 account recovery mechanisms regarding their properties for FIDO2 passwordless authentication. Our results show that the currently used methods have many drawbacks. Some even rely on passwords, taking passwordless authentication ad absurdum. Still, our evaluation identifies promising account recovery solutions and provides recommendations for further studies.
description: 12 pages, 1 figure, 1 table
Bifacial PV System Mismatch Loss Estimation and Parameterization
Creators: name: Deline, C.
name: Ayala Pelaez, S.
name: MacAlpine, S.
name: Olalla, C.
Publisher: name: WIP
Year: 2019
Subjects: PV Systems and Storage – Modelling, Design, Operation and Performance
Design and Installation of PV Systems

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 1449-1453
description: Non-uniform irradiance on the rear-side of bifacial PV systems can cause additional mismatch loss which may not be appropriately captured in PV energy production estimates and software. We have evaluated several rooftop mounted systems over high albedo reflective roofs. Mismatch losses of up to 2% annual loss for very closemounted (0.15 m) rooftop systems were found, but losses for high ground-clearance rooftop systems were lower (<0.5%). A simplified empirical relationship was found that links the spatial variation of irradiance (specifically the mean absolute difference of irradiance) to the resulting mismatch loss factor, with a R2 fit better than 0.985. This approximate relationship has been validated by experiments on mismatched PV modules, and provides a basis for fast estimation of bifacial mismatch loss factors for use in hourly PV performance simulations such as PVSyst or SAM.
Universal Limits on Massless High-Spin Particles
Creators: name: Porrati, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a model-independent argument showing that massless particles interacting with gravity in a Minkowski background space can have at most spin two. This result is proven by extending a famous theorem due to Weinberg and Witten to theories that do not possess a gauge-invariant stress-energy tensor.
description: 21 pages. To appear in PRD; two additional references
Electrical Characterization of Nano-Colloids in Si Solar Cell Screen-Printed Contacts by Conductive Atomic Force Microscopy (C-AFM)
Creators: name: Ren, K.
name: Han, D.
name: Ebong, A.
Publisher: name: WIP
Year: 2019
Subjects: Silicon Materials and Cells
Characterisation & Simulation of Si Cells

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 286-289
description: The glass layer thickness and conductivity at the Si/Ag gridline interface of a screen-printed solar cell can limit the application of fire through dielectric contacts to the lowly doped emitter which is critical to enhance the efficiency. In order to reduce cost and advance the penetration of PV electricity by decreasing the associated resistance and increasing the fill factor and efficiency, the glass layer needs to be conductive, irrespective of the thickness. This paper reports the microstructural and electrical characterization of the glass layer at the Si/Ag gridline interface to elucidate its conductivity and thickness. Microscopy analysis was used to confirm that after the Ag gridline removal, the glass layer found underneath the Ag gridlines was thick (>300 nm) and encapsulated nano-colloids. STEM revealed the nano-colloids contained high concentration of Ag, Pb and Te with small amount of Si glass. The C-AFM showed that the thick glass layer had micro-size conductive areas which correspond to the nano-colloids and from the I-V curve, the specific contact resistance of the nano-colloids was estimated as 4.93~26.94×10-4 Ω·cm2. The I-V curve modeled according to the modified Fowler-Nordheim tunneling (FNT) showed low barrier height of 0.1 eV, which corresponds to a layer thickness of ~17 nm.
An Interpolation Scheme for VDVP Lagrangian Basis Flows
Creators: name: Sane, Sudhanshu
name: Childs, Hank
name: Bujack, Roxana
Publisher: name: The Eurographics Association
Year: 2019
Subjects: Computing methodologies
Scientific visualization

description: Using the Eulerian paradigm, accurate flow visualization of 3D time-varying data requires a high temporal resolution resulting in large storage requirements. The Lagrangian paradigm has proven to be a viable in situ-based approach to tackle this large data visualization problem. However, previous methods constrained the generation of Lagrangian basis flows to the special case of fixed duration and fixed placement (FDFP), in part because reconstructing the flow field using these basis flows is trivial. Our research relaxes this constraint, by considering the general case of variable duration and variable placement (VDVP) with the goal of increasing the amount of information per byte stored. That said, reconstructing the flow field using VDVP basis flows is non-trivial; the primary contribution of our work is a method we call VDVP-Interpolation which solves this problem. VDVP-Interpolation reduces error propagation and limits interpolation error while using VDVP Lagrangian basis flows. As a secondary contribution of the work, we generate VDVP basis flows for multiple data sets and demonstrate improved accuracy-storage propositions compared to previous work. In some cases, we demonstrate up to 40-60% more accurate pathline calculation while using 50% less data storage.
description: Eurographics Symposium on Parallel Graphics and Visualization
description: Session 4
description: 109
description: 119
description: Sudhanshu Sane, Hank Childs, and Roxana Bujack
description: CCS Concepts: Computing methodologies --> Scientific visualization
Universal scaling laws rule explosive growth inhuman cancers
Creators: name: Pérez-García, Víctor M.
name: Calvo, Gabriel F.
name: Bosque, Jesús J.
name: León-Triana, Odelaisy
name: Jiménez, Juan
name: Pérez-Beteta, Julián
name: Belmonte-Beitia, Juan
name: Valiente, Manuel
name: Zhu, Lucía
name: García-Gómez, Pedro
name: Sánchez-Gómez, Pilar
name: Miguel, Esther Hernández-San
name: Hortigüela, Rafael
name: Azimzade, Youness
name: Molina-García, David
name: Martínez, Álvaro
name: Rojas, Ángel Acosta
name: de Mendivil, Ana Ortiz
name: Vallette, Francois
name: Schucht, Philippe
name: Murek, Michael
name: Pérez-Cano, María
name: Albillo, David
name: Martínez, Antonio F. Honguero
name: Londoño, Germán A. Jiménez
name: Arana, Estanislao
name: Vicente, Ana M. García
Publisher: name: arXiv
Year: 2021
Subjects: subject: Tissues and Organs (q-bio.TO)
subject: FOS: Biological sciences

description: Most physical and other natural systems are complex entities composed of a large number of interacting individual elements. It is a surprising fact that they often obey the so-called scaling laws relating an observable quantity with a measure of the size of the system. Here we describe the discovery of universal superlinear metabolic scaling laws in human cancers. This dependence underpins increasing tumour aggressiveness, due to evolutionary dynamics, which leads to an explosive growth as the disease progresses. We validated this dynamic using longitudinal volumetric data of different histologies from large cohorts of cancer patients. To explain our observations we put forward increasingly complex biologically-inspired mathematical models that captured the key processes governing tumor growth. Our models predicted that the emergence of superlinear allometric scaling laws is an inherently three-dimensional phenomenon. Moreover, the scaling laws thereby identified allowed us to define a set of metabolic metrics with prognostic value, thus providing added clinical utility to the base findings.
The role of Lambda in the cosmological lens equation
Creators: name: Sereno, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The cosmological constant Lambda affects cosmological gravitational lensing. Effects due to Lambda can be studied in the framework of the Schwarzschild-de Sitter spacetime. Two novel contributions, which can not be accounted for by a proper use of angular diameter distances, are derived. First, a term 2m b Lambda/3 has to be added to the bending angle, where "m" is the lens mass and "b" the impact parameter. Second, Lambda brings about a difference in the redshifts of multiple images. Both effects are quite small for real astrophysical systems (contribution to the bending < 0.1 microarcsec and difference in redshift < 10^{-7}).
description: 4 pages. (Univ. Zuerich); v2: presentation improved, discussion extended, references to papers posted after the v1-version added. In press on Phys. Rev. Lett
Molecular and morphological analyses reveal pseudocryptic diversity in Micromelo undatus (Bruguière, 1792) (Gastropoda: Heterobranchia: Aplustridae)
Creators: name: Feliciano, Kendall
name: Malaquias, Manuel António E.
name: Stout, Carla
name: Brenzinger, Bastian
name: Gosliner, Terrence M.
name: Valdés, Ángel
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Molecular Biology
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Plant Biology

description: The genus Micromelo (family Aplustridae) occurs in almost all tropical and subtropical waters across the globe, with the exception of the Eastern Pacific. Most authors consider Micromelo undatus (Bruguière, 1792) as the only valid species in this genus. This study examines populations of specimens identified as M. undatus across its geographic range, using morphological and genetic data from two mitochondrial genes (16S and CO1) and one nuclear gene (Histone H3). The results reveal that M. undatus is a complex of four species with consistent genetic and anatomical differences. A literature review and evaluation of type material indicates that available names exist for three of the four species. Micromelo guamensis, M. undatus and M. scriptus are resurrected for species found in the Western Pacific, the Atlantic Ocean, and widespread in the Indo-Pacific, respectively. A new name is introduced for another species found in the Western Pacific, namely Micromelo barbarae sp. nov. and a neotype is designated for the type species of the genus M. undatus. http://zoobank.org/urn:lsid:zoobank.org:act:02091D97-0AE1-4AE4-9910-726C4F0ABE2F
Concerns and uncertainties associated with the calculations of fluxes of water masses, heat and salt in the North Icelandic Irminger Current
Creators: name: Jonsson, Steingrimur
Publisher: name: Zenodo
Year: 2019

description: Blue-Action and ASOF Workshop 2019 on "Representativeness of ocean observations and Flux calculations" held at the Danish Meteorological Institute in Copenhagen (DK) on 24 -26 April 2019
description: The Blue-Action project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 727852
ESTIMATING CHLOROPHYLL A CONCENTRATIONS OF SEVERAL INLAND WATERS WITH HYPERSPECTRAL DATA AND MACHINE LEARNING MODELS
Creators: name: Maier, Philipp
name: Keller, Sina
Publisher: name: Karlsruhe
Year: 2019
Subjects: Spectral Resolution
Inland Waters
Supervised Learning
Support Vector Machine
Random Forest
Neural Network
Remote Sensing
Phytoplankton

description: Water is a key component of life, the natural environment and human health. For monitoring the conditions of a water body, the chlorophyll a concentration can serve as a proxy for nutrients and oxygen supply. In situ measurements of water quality parameters are often time-consuming, expensive and limited in areal validity. Therefore, we apply remote sensing techniques. During field campaigns, we collected hyperspectral data with a spectrometer and in situ measured chlorophyll a concentrations of 13 inland water bodies with different spectral characteristics. One objective of this study is to estimate chlorophyll a concentrations of these inland waters by applying three machine learning regression models: Random Forest, Support Vector Machine and an Artificial Neural Network. Additionally, we simulate four different hyperspectral resolutions of the spectrometer data to investigate the effects on the estimation performance. Furthermore, the application of first order derivatives of the spectra is evaluated in turn to the regression performance. This study reveals the potential of combining machine learning approaches and remote sensing data for inland waters. Each machine learning model achieves an R2-score between 80% to 90% for the regression on chlorophyll a concentrations. The random forest model benefits clearly from the applied derivatives of the spectra. In further studies, we will focus on the application of machine learning models on spectral satellite data to enhance the area-wide estimation of chlorophyll a concentration for inland waters.
The Peculiar Volatile Composition of Comet 8P/Tuttle: A Contact Binary of Chemically Distinct Cometesimals?
Creators: name: Bonev, B. P.
name: Mumma, M. J.
name: Radeva, Y. L.
name: DiSanti, M. A.
name: Gibb, E. L.
name: Villanueva, G. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report measurements of eight native (i.e., released directly from the comet nucleus) volatiles (H2O, HCN, CH4, C2H2, C2H6, CO, H2CO, and CH3OH) in comet 8P/Tuttle using NIRSPEC at Keck 2. Comet Tuttle reveals a truly unusual composition, distinct from that of any comet observed to date at infrared wavelengths. The prominent enrichment of methanol relative to water contrasts the depletions of other molecules, especially C2H2 and HCN. We suggest that the nucleus of 8P/Tuttle may contain two cometesimals characterized by distinct volatile composition. The relative abundances C2/CN, C2/OH, and CN/OH in 8P/Tuttle (measured at optical/near-UV wavelengths) differ substantially from the mixing ratios of their potential parents (C2H2/HCN, C2H2/H2O, and HCN/H2O) found in this work. Based on this comparison, our results do not support C2H2 and HCN being the principal precursors for respectively C2 and CN in Tuttle. The peculiar native composition observed in 8P/Tuttle (compared to other comets) provides new strong evidence for chemical diversity in the volatile materials stored in comet nuclei. We discuss the implications of this diversity for expected variations in the deuterium enrichment of water among comets.
description: Accepted for Astrophysical Journal Letters
Conformally flat, quasi-circular numerical simulations of the gravitational wave chirp from binary neutron star merger GW170817
Creators: name: Mathews, Grant J.
name: Suh, In-Saeng
name: Lan, N. Q.
name: Kedia, Atul
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The first detection of gravitational waves from the binary neutron star merger GW170817 by the LIGO-Virgo Collaboration has provided fundamental new insights into the astrophysical site for r-process nucleosynthesis and on the nature of dense neutron-star matter. The detected gravitational wave signal depends upon the tidal distortion of the neutron stars as they approach merger. We report on relativistic numerical simulations of the approach to binary merger in the conformally flat, quasi-circular orbit approximation. We show that this event serves as a calibration to the quasi-circular approximation and a confirmation of the validity of the conformally flat approximation to the three-metric. We then examine how the detected chirp depends upon the adopted equation of state. This establishes a new efficient means to constrain the nuclear equation of state in binary neutron star mergers.
description: 5 pages, 1 figure
The Impact of Plane-of-Array Based TMY Data Sets on Solar Resource for PV Applications
Creators: name: Sengupta, M.
name: Habte, A.
Publisher: name: WIP
Year: 2019
Subjects: PV Systems and Storage – Modelling, Design, Operation and Performance
Solar Resource and Forecasting

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 1399-1402
description: This study attempts to apprise stakeholders of the accurate use of a typical meteorological year (TMY) data set for decision-making that could potentially speed up the acceptance and deployment of projects and reduce risks to financiers and developers. A TMY data set represents hourly concatenation of 12 typical meteorological months constructed using multiyear data sets. Typically, TMY data sets are constructed under horizonal irradiance conditions that are then used in photovoltaic (PV) performance models for available energy calculations in a location after transposing the data to represent a desired plane-of-array (POA) orientation. In this study, we attempt to show that a POA TMY generated with corresponding POA irradiance time-series information produces significantly different results than a POA TMY generated by transposing a TMY data set. In some months, the differences can be more than 3% for irradiance and energy yield. These results point to the need for generating TMY data sets using POA irradiance time series representing the orientation at which PV panels will be deployed.
Engineering Superposition States and Tailored Probes for Nano-resonators Via Open-Loop Control
Creators: name: Jacobs, Kurt
name: Tian, Lin
name: Finn, Justin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that a nano-resonator can be prepared in mesoscopic-superposition states merely by monitoring a qubit coupled to the square of the resonators position. This works for thermal initial states, and does not require a third-order nonlinearity. The required coupling can be generated using a simple open-loop control protocol, obtained with optimal control theory. We simulate the complete preparation process, including environmental noise. Our results indicate the power of open-loop control for state-engineering and measurement in quantum nano-systems.
description: 4 pages, Revtex 4
A study of the 1/2 retrograde resonance: Periodic orbits and resonant capture
Creators: name: Morais, M. H. M.
name: Namouni, F.
name: Voyatzis, G.
name: Kotoulas, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We describe the families of periodic orbits in the 2-dimensional 1/2 retrograde resonance at mass ratio 0.001, analyzing their stability and bifurcations into 3-dimensional periodic orbits. We explain the role played by periodic orbits in adiabatic resonance capture, in particular how the proximity between a stable family and an unstable family with a nearly critical segment, associated with Kozai separatrices, determines the transition between distinct resonant modes observed in numerical simulations. Combining the identification of stable, critical and unstable periodic orbits with analytical modeling, resonance capture simulations and computation of stability maps helps to unveil the complex 3-dimensional structure of resonances.
description: Preprint version of article. The final version with small corrections will be published in Celestial Mechanics and Dynamical Astronomy
The effect of stratification of microplankton communities in the northern Strait of Georgia
Creators: name: Haigh, Rowan
Publisher: name: University of British Columbia
Year: 2010

description: The northern Strait of Georgia (NSG) and adjacent Malaspina Complex of inlets (MC) were studied to determine the effect of stratification on microplankton communities. The NSG was dominated by nanoflagellates in spring. There was no evidence of a vernal diatom bloom in the Strait, perhaps due to wind turbulence or microzooplankton grazing. In early summer regimes were conducive to diatom growth but the northern Strait was experiencing a "mild" red tide. By late summer, diatoms bloomed and prevailed, presumably, till the fall decline. Stratification was greatest in late summer, due chiefly to temperature, with reduced surface salinities on the east side from Fraser River runoff. At this time biological partitioning was pronounced, resulting in a mosaic of organismal groups. Although stratification had declined by early autumn, the mosaicism was maintained and strengthened. Diatoms were most abundant in the north and on the west side where stratification was least, in areas of tidal turbulence. Photosynthetic nanoflagellates and photosynthetic dinoflagellates favoured the more stratified east side. Ciliate distributions mirrored those of the nanoflagellates. The MC was thought to be a more stratified version of the NSG but it was found to be a fairly mixed water body due to tidal action. It was sheltered from winds which allowed the early blooming of diatoms. These were maintained for several months by a tidal jet through Malaspina Inlet that probably injected nutrients into the junction of Malaspina, Okeover, and Lancelot Inlets. Principal components analysis was used to reduce the dimensionality of the biological dataset, and canonical correlation analysis allowed the coupling of environmental data to the biological principal components. It was found that PCI reflected general biomass while PC's II and III were most often related to depth and location. These latter two were utilised to resolve the species information in three-dimensions. In general, nanoflagellates populated surface waters whereas diatoms tended to occupy deeper depths. Multiple regression analysis was performed on organismal groups to explore how biomass was affected by stratification, pycnocline depth, surface temperature (seasonality), nitrate, and grazing.
Connecting steady emission and Very High Energy flaring states in blazars: the case of Mrk 421
Creators: name: Dmytriiev, A.
name: Sol, H.
name: Zech, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Various attempts have been made in the literature at describing the origin and the physical mechanisms behind flaring events in blazars with radiative emission models, but detailed properties of multi-wavelength (MWL) light curves still remain difficult to reproduce. We have developed a versatile radiative code, based on a time-dependent treatment of particle acceleration, escape and radiative cooling, allowing us to test different scenarios to connect the continuous low-state emission self-consistently with that during flaring states. We consider flares as weak perturbations of the quiescent state and apply this description to the February 2010 MWL flare of Mrk 421, the brightest Very High Energy (VHE) flare ever detected from this archetypal blazar, focusing on interpretations with a minimum number of free parameters. A general criterion is obtained, which disfavours a one-zone model connecting low and high state under our assumptions. A two-zone model combining physically connected acceleration and emission regions yields a satisfactory interpretation of the available time-dependent MWL light curves and spectra of Mrk 421, although certain details remain difficult to reproduce. The two-zone scenario finally proposed for the complex quiescent and flaring VHE emitting region involves both Fermi-I and Fermi-II acceleration mechanisms, respectively at the origin of the quiescent and flaring emission.
Excitation and Detection of THz Coherent Spin Waves in Antiferromagnetic $\mathrm{α-Fe_2O_3}$
Creators: name: Grishunin, K.
name: Mashkovich, E. A.
name: Balbashov, A. M.
name: Zvezdin, A. K.
name: Kimel, A. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The efficiency of ultrafast excitation of spins in antiferromagnetic $\mathrm{α-Fe_{2}O_{3}}$ using nearly single-cycle THz pulse is studied as a function of the polarization of the THz pulse and the sample temperature. Above the Morin point the most efficient excitation is achieved when the magnetic field of the THz pulse is perpendicular to the antiferromagnetically coupled spins. Using the experimental results and equations of motion for spins, we show that the mechanism of the spin excitation above and below the Morin point relies on magnetic-dipole interaction of the THz magnetic field with spins and the efficiency of the coupling is proportional to the time derivative of the magnetic field.
Exceeding 23 % and Mass Production of p-Cz Q.ANTUM Bifacial Solar Cells
Creators: name: Stenzel, F.
name: Lee, B.G.
name: Cieslak, J.
name: Schwabedissen, A.
name: Wissen, D.
name: Geißler, S.
name: Rudolph, T.
name: Faulwetter-Quandt, B.
name: Hönig, R.
name: Wasmer, S.
name: Bakowskie, R.
name: Buß, D.
name: Fertig, F.
name: Schaper, M.
name: Mette, A.
name: Müller, J.W.
Publisher: name: WIP
Year: 2019
Subjects: Silicon Materials and Cells
Manufacturing & Production of Si Cells

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 96-99
description: Hanwha Q CELLS has developed bifacial p-Cz Q.ANTUM cells with average efficiency in mass production above 22.2%, measured with 1000 W/m² front illumination. The bifaciality factor of the cells is exceeding 78%. A comparison of bifacial versus equivalent monofacial cells shows that the bifacial cells have slightly lower front efficiency by 0.1%abs. Bifacial modules with 144 half-cells having average power class of 390 WP on the front and a bifaciality of around 70% are demonstrated. Q.ANTUM bifacial cells in pilot line exceeded 23% front cell efficiency which was independently confirmed.
Center-of-mass motion and cross-channel coupling in time-dependent Hartree-Fock theory
Creators: name: Umar, A. S.
name: Oberacker, V. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We provide a discussion of issues related to the center-of-mass motion and cross-channel coupling in applications of the time-dependent Hartree-Fock (TDHF) theory to heavy-ion collisions. We find that the entrance channel dynamics of a heavy-ion collision as described by TDHF does not seem to be significantly influenced by these effects, whereas the long-time evolution may be less reliable.
description: 4 pages, 4 figures
The Local Environment of the FUor-like Objects AR 6A and 6B
Creators: name: Moriarty-Schieven, Gerald H.
name: Aspin, Colin
name: Davis, Gary R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new 12CO J=3-2 and HCN J=3-2 molecular line maps of the region surrounding the young star AR 6 using the 15 metre James Clerk Maxwell Telescope. AR 6 was previously found to be a double source with both components exhibiting several characteristics of FU Orionis (FUor) eruptive variable stars. Our data indicates that AR 6, like FU Orionis itself, does not possess a CO outflow and likewise, does not show evidence for large amounts of molecular g as in its circumstellar environment. We conclude that from the near-IR to the sub-mm, AR 6 is similar to FU Orionis in several respects. We interpret the lack of significant dust and molecular gas in the circumstellar environment of AR 6, together with the large near-IR thermal excess, as evidence that the sources have exhausted their natal envelopes, that they have at least small hot circumstellar disks, and that they are more evolved than Class I protostars. This, in itself, suggests that, since FUor eruptions have also been observed in stars with large dust mass envelopes (e.g. V346 Nor) and with CO outflows (e.g. L1551 IRS5), FUor events probably occur at many different stages in the early, formative phase of a star's life, and lends support to the idea that FUor outbursts are repetitive like their shorter-lived relatives occurring in EXor eruptive variables. Finally, we show that, being part of the 'Spokes' young stellar cluster, AR 6 is unlike many FUors which typically are located in more sparsely populated regions.
description: Accepted for publication in The Astronomical Journal (October 2008)
Radial velocities of five globular clusters obtained with AAOmega
Creators: name: Székely, P.
name: Kiss, L. L.
name: Szatmáry, K.
name: Csák, B.
name: Bakos, G. Á.
name: Bedding, T. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using the recently commissioned multi-object spectrograph AAOmega on the 3.9m AAT we have obtained medium-resolution near-infrared spectra for 10,500 stars in and around five southern globular clusters. The targets were 47 Tuc, M12, M30, M55 and NGC 288. We have measured radial velocities to +/- 1 km/s with the cross correlation method and estimated metallicity, effective temperature, surface gra vity and rotational velocity for each star by fitting synthetic model spectra. An analysis of the velocity maps and velocity dispersion of member stars revealed systemic rotation in four of the target clusters.
description: 4 pages, 6 figures, accepted for publication by Astronomische Nachrichten
Giovanella Bonatto
Creators: name: Wolff, Marta
name: Kosmann, Cecilia
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Calliphoridae
Giovanella

description: Genus Giovanella Bonatto
 Giovanella Bonatto, 2005: 884. Type species, bolivar Bonatto (orig. des.). Refs.: Bonnatto & Marinoni, 2005: 884; Wolff et al., 2013a: 129.
description: Published as part of Wolff, Marta & Kosmann, Cecilia, 2016, FAMILIES CALLIPHORIDAE AND MESEMBRINELLIDAE, pp. 856-875 in Zootaxa 4122 (1) on page 866, DOI: 10.11646/zootaxa.4122.1.72, http://zenodo.org/record/263487
Isospin symmetry breaking in double-pion production in the region of ${d^*(2380)}$ and the scalar $σ$ meson
Creators: name: Platonova, M. N.
name: Kukulin, V. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The first attempt is made to provide a quantitative theoretical interpretation of the WASA-at-COSY experimental data on the basic double-pion production reactions $pn \to d π^0π^0$ and $pn \to d π^+π^-$ in the energy region $T_p =1$ - $1.3$ GeV [P. Adlarson et al., Phys. Lett. B 721, 229 (2013)]. The data are analyzed within a model based on production and decay of an intermediate $I(J^P)=0(3^+)$ dibaryon resonance $\mathcal{D}_{03}$ (denoted also as $d^*(2380)$). The observed decrease of the near-threshold enhancement (the so-called ABC effect) in the reaction $pn \to d π^+π^-$ in comparison to that in the reaction $pn \to d π^0π^0$ is explained (at least partially) to be due to isospin symmetry violation in the two-pion decay of an intermediate near-threshold scalar $σ$ meson emitted from the $\mathcal{D}_{03}$ dibaryon resonance under conditions of the partial chiral symmetry restoration.
description: 16 pages, 9 figures; version accepted for publication in Phys. Rev. D
Photovoltaic Climate Zones: The Global Distribution of Climate Stressors Affecting Photovoltaic Degradation
Creators: name: Karin, T.
name: Birk Jones, C.
name: Jain, A.
Publisher: name: WIP
Year: 2019
Subjects: Photovoltaic Modules and BoS Components
PV Module Design, Manufacture, Performance and Reliability

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 825-834
description: A large body of previous research indicates that climate affects photovoltaic (PV) degradation both in terms of steady power loss and hazardous failures. However, the geographic distribution of climate stressors has not yet been characterized in a systematic way. Most typically the Köppen-Geiger classification scheme is used to compare PV degradation across different climates. However, Köppen-Geiger uses temperature and rainfall to develop zones relevant for botany and lacks the ability to distinguish locations based on climate stressors more relevant to PV degradation. Prior work has shown that specific stressors, e.g. high temperature, temperature cycling, damp heat, wind stress and UV exposure, induce multiple PV degradation modes such as solder bond degradation, corrosion by moisture intrusion, wind-induced cell cracking, encapsulant discoloration and others. We introduce a climate zone classification system specific to PV, PhotoVoltaic Climate Zones (PVCZ-2019 or PVCZ) that defines zones based on the geographic distribution in PV stressor intensity. By comparison, we show that Köppen-Geiger classifies areas with very different module temperature stress into the same zone and is not ideal for understanding PV degradation. In contrast, the PVCZ scheme provides quantitative thresholds on the climate stress experienced in each zone, providing a basis for future work studying the impact of climate on PV degradation and failure.
Chiral symmetry breaking beyond BCS and theorem on the width of scalars
Creators: name: Bicudo, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review chiral symmetry breaking at the BCS level, in the framework of chiral invariant quark models and in the Schwinger-Dyson formalism. We revisit the pi mass problem beyond the BCS level. We show a theorem on the masses, on the widths and on the q qbar content of the scalar mesons sigma and f0.
description: 6 pages, talk presented at SCADRON 70, Workshop on Scalar Mesons and Related Topics, February 2008, Lisbon
Optimización de la producción recombinante en Escherichia coli de la enzima N-acetil glucosamina oxidasa en un sistema libre de antibióticos
Creators: name: Guerra-Mas, Gerard
name: Fredes, Yerko
name: Dimitri, Ivan
name: Romero, Oscar
name: Guillén, Marina
name: González, Gloria
name: Casablancas, Antoni
Publisher: name: Zenodo
Year: 2024

description: INTRODUCCIÓNEl proyecto OXIPRO tiene como objetivo el diseño de un proceso, desde la mejora computacional de la enzima, la optimización de la expresión de la enzima, hasta laimplementación de un sistema enzimático con oxidorreductasas como alternativa sostenible al proceso de tratamiento industrial de fibras de algodón. La enzima deestudio, la N-acetil glucosamina oxidasa L251R es capaz de oxidar los carbohidratos liberados durante el tratamiento del algodón produciendo peróxido de hidrógenopara el tratamiento in situ del algodón [1].Se desarrolla un proceso de producción de la enzima en cultivo de alta densidad celular con la cepa de Escherichia coli M15∆glyA en un sistema libre de antibióticos[2]. Además, se detalla el mecanismo de purificación e inmovilización en un solo paso mediante la fusión de la enzima a celulose binding module 3 (CBM3) para lainmovilización en celulosa [3]. En este caso de estudio, además, la inmovilización y purificación sobre celulosa presenta mayor especificidad que la purificación porcola de histidinas permitiendo eliminar las catalasas producidas por E. coli que son capaces de metabolizar el peróxido de hidrógeno producido.
แนวทางการเสริมสร้างศักยภาพของผู้ประกอบการด้านอาหารขนาดกลางและขนาดย่อมของประเทศไทย
Creators: name: วรนันท์ สุวรรณปิฎกกุล
name: ชุติมา ไวศรายุทธ์
Publisher: name: สมาคมนักวิจัย
Year: 2554
Subjects: การเสริมสร้างศักยภาพ,การแบ่งกลุ่ม,ความตระหนักในคุณภาพและความปลอดภัยอาหาร,ผู้ประกอบการด้านอาหารขนาดกลางและขนาดย่อม

description: 3, 16, วารสารสมาคมนักวิจัย
Observability and nonlinear filtering
Creators: name: van Handel, Ramon
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 93E11, 60J25, 62M20, 93B05, 93B07, 93E15

description: This paper develops a connection between the asymptotic stability of nonlinear filters and a notion of observability. We consider a general class of hidden Markov models in continuous time with compact signal state space, and call such a model observable if no two initial measures of the signal process give rise to the same law of the observation process. We demonstrate that observability implies stability of the filter, i.e., the filtered estimates become insensitive to the initial measure at large times. For the special case where the signal is a finite-state Markov process and the observations are of the white noise type, a complete (necessary and sufficient) characterization of filter stability is obtained in terms of a slightly weaker detectability condition. In addition to observability, the role of controllability in filter stability is explored. Finally, the results are partially extended to non-compact signal state spaces.
MOCVD Grown InGaAsP-Based Single Junction Solar Cells with Bandgap-Voltage Offsets Ap-proaching Radiative-Recombination-Only Limit
Creators: name: Li, X.
name: Lu, H.
name: Le, G.
name: Zhang, W.
name: Yang, G.
Publisher: name: WIP
Year: 2019
Subjects: Perovskites, other Non-Silicon-Based Photovoltaics and Multi-Junction Devices
III-V and Related Compound Semiconductor Based Devices

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 693-695
description: We report on the study of InGaAsP-based single junction solar cells on InP substrates grown by MOVPE. Using the high temperature of 650 °C and growth improvements, the epitaxial InGaAsP layers presents quite good quality and therefore, remarkable photovoltaic performances for further fabricated solar cells. The experimental bandgap-voltage offsets (Woc) of the devices are approaching the theoretical values predicted using diffusion-limited model.
Superconformal M2-branes and generalized Jordan triple systems
Creators: name: Nilsson, Bengt E. W.
name: Palmkvist, Jakob
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Three-dimensional conformal theories with six supersymmetries and SU(4) R-symmetry describing stacks of M2-branes are here proposed to be related to generalized Jordan triple systems. Writing the four-index structure constants in an appropriate form, the Chern-Simons part of the action immediately suggests a connection to such triple systems. In contrast to the previously considered three-algebras, the additional structure of a generalized Jordan triple system is associated to a graded Lie algebra, which corresponds to an extension of the gauge group. In this note we show that the whole theory with six manifest supersymmetries can be naturally expressed in terms of such a graded Lie algebra. Also the BLG theory with eight supersymmetries is included as a special case.
description: 15 pages, v2 and v3: minor corrections and clarifications, references added, v2: section 4 extended, v3: published version
โมเดลการตลาดเชิงประสบการณ์ของนักท่องเที่ยวชาวต่างชาติ
Creators: name: ภัทรพร ทิมแดง
name: วินัย ปัญจขจรศักดิ์
Publisher: name: สมาคมนักวิจัย
Year: 2554
Subjects: แรงจูงใจในการท่องเที่ยว,การตลาดเชิงประสบการณ์,ผลสัมฤทธิ์การตลาดเชิงประสบการณ์

description: 3, 16, วารสารสมาคมนักวิจัย
ความพึงพอใจของชุมชนต่อการให้บริการสาธารณะของเทศบาลตำบลบึงยี่โถ อำเภอธัญบุรี จังหวัดปทุมธานี
Creators: name: เยาวภา ปฐมศิริกุล
Publisher: name: สมาคมนักวิจัย
Year: 2555
Subjects: ความพึงพอใจ,ชุมชน,บริการสาธารณะ,เทศบาลตำบล

description: 3, 17, วารสารสมาคมนักวิจัย
Investigation on Shunt Severity in PV Modules by Electroluminescence Imaging and Lock-in Thermography
Creators: name: Roy, S.
name: Kumar, S.
name: Meena, R.
name: Gupta, R.
Publisher: name: WIP
Year: 2019
Subjects: Photovoltaic Modules and BoS Components
PV Module Design, Manufacture, Performance and Reliability

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 1180-1182
description: Investigation on the severity of localized shunts in photovoltaic (PV) modules is a key requirement considering the strong influence of shunts. Lock-in thermography (LIT) has been used as effective characterization technique for detection of shunts in solar cells, however, it has limited applicability in PV modules. In other nondestructive techniques, electroluminescence (EL) imaging has emerged as an effective characterization tool for investigation of PV modules that has also been used for characterization of shunts. In this paper, several applications of EL imaging technique in PV modules such as the floating potential determination, spatial intensity analysis and current dependent imaging have been exploited in combination with dark lock-in thermography (DLIT) for investigation of relative severity of localized shunts in PV modules. Shunts at different locations in the cells of the PV modules have been characterized and a good correspondence on the severity of different shunts has been observed. The proposed non-destructive approach can be advantageous in locating shunts in PV modules on the basis of severity, which can be related with performance and reliability of PV modules.
Active deployable primary mirrors on CubeSat
Creators: name: Schwartz, Noah
name: Milanova, Maria
name: Brzozowski, William
name: Todd, Stephen
name: Ali, Zeshan
name: Buron, Lucie
name: Jean-François-Sauvage
name: Bond, Charlotte
name: Bruce, Heather
name: Rees, Phil
name: Ferrari, Marc
name: MacLeod, Donald
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The volume available on small satellites restricts the size of optical apertures to a few centimetres, limiting the Ground-Sampling Distance (GSD) in the visible to typically 3 m at 500 km. We present in this paper the latest development of a laboratory demonstrator of a segmented deployable telescope that will triple the achievable ground resolution and improve photometric capability of CubeSat imagers. Each mirror segment is folded for launch and unfolds in space. We demonstrate through laboratory validation very high deployment repeatability of the mirrors
description: Proceedings of 13th IAA Symposium on Small Satellites for Earth Observation (SSSEO 2021)
Identification of the Source of Degradation of Silicon Heterojunction Solar Cells from the Shape of the I-V Characteristics: Theory and Experimental Case Study
Creators: name: Abdulraheem, Y.
name: Ghannam, M.Y.
name: Sivaramakrishnan Radhakrishna, H.
name: Singh Yadav, T.
name: Cho, J.
name: Gordon, I.
Publisher: name: WIP
Year: 2019
Subjects: Silicon Materials and Cells
Heterojunction Solar Cells

description: 36th European Photovoltaic Solar Energy Conference and Exhibition; 516-521
description: Degradation of the Fill factor (FF) of p+/n silicon heterojunction solar cells (SHJ) is mainly caused by the presence of two thermionic barriers in the cell. The first barrier occurs at the hetero-interface between intrinsic a-Si:H(i) spacer and the n-type crystalline silicon substrate (c-Si(n)). The second is the Schottky barrier that occurs at the front contact interface between the p-type doped amorphous silicon (a-Si:H(p+)) and the transparent conducting oxide (TCO). It is shown that it is possible to distinguish which of either barrier is responsible for the cell performance degradation by carefully inspecting the I-V characteristics under illumination. A clear electro-physical interpretation is given for each situation for cells with different doping levels in a-Si:H supported by the results of numerical simulations carried out by means of AFORS-HET device simulator. An experimental case study of real SHJ cells with different a-Si:H doping levels is used to confirm the proposed interpretations.