cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Surviving to thriving: post-secondary education for refugee youth in smaller centres in Canada
Creators: name: Que, Hua
Publisher: name: Memorial University of Newfoundland
Year: 2020

description: The research investigates refugee youth’s aspirations for and access to post-secondary education in St. John’s, Newfoundland and Labrador, Canada. The theoretical framework that underpins this study consists of segmented assimilation theory and the bioecological model of human development. A basic qualitative research approach was employed. Twenty refugee youths and three staff members from educational service providers participated in this study. Data were collected through one-on-one semi-structured interviews.
 Findings revealed that new life in Canada instilled hope into refugee youth as they aspired to get into university after high school. Refugee youth referred to their parents, support teachers and staff in high school, their friends, and university academic advisors as important people who helped them realize their educational goals. In addition, three educational programs were identified by refugee youth as helpful in preparing them for post-secondary education. Nonetheless, refugee youth’s access to post-secondary education was impeded by a number of barriers, including financial difficulties resulting from the repayment of transportation loans and a lack of target scholarships for refugee students pursuing post-secondary education, lack of information about post-secondary admission requirements, scholarships, and on-campus employment opportunities, negative peer influence from refugee students who were less motivated, limited communication with local peers, and fear of the unknown and the academic challenges they would face in post-secondary education. In addition, refugee youth aged 19 or over found it difficult to further their education due to the policy of high school age limits and a lack of appropriate adult educational programs geared to their needs. Recommendations were also offered to reduce these barriers such as eliminating transportation loans and offering targeted scholarships and bursaries to refugee youth; providing refugee youth with information and assistance they need to make informed decisions about their education and career; increasing the number of ESL teachers at the secondary level and continuing to offer ESL support for college and university refugee students; and optimizing language and academic support for refugee young adults with goals of pursuing post-secondary education.
A twisted emission geometry in non-central Pb+Pb collisions measurable via azimuthally sensitive HBT
Creators: name: Graef, Gunnar
name: Lisa, Mike
name: Bleicher, Marcus
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We use the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) model to simulate Pb+Pb collisions. In the freeze out geometry of non-central Pb+Pb collisions we observe a tilt of the particle emission zone in the collision plane away from the beam axis. We find that the magnitude of this tilt depends on the scale at which the distribution is measured. We quantify this "twisting" behavior with a parameterization and propose to measure it experimentally via azimuthally sensitive Hanbury-Brown Twiss correlations. Additionally we show that the twist is related to the emission of particles from different times during the evolution of the source. A systematic comparison between the theoretically observed twist in the freeze out position distribution and a mock experimental analysis of the model calculations via HBT correlations is shown.
description: 10 pages, 7 figures
Critical scattering at the order-disorder phase transition of Si(111)-√3×√3R30°-Au surface: A phase transition with particle exchange
Creators: name: Nakajima, Y.
name: Voges, C.
name: Nagao, T.
name: Hasegawa, S.
name: Klos, G.
name: Pfnür, Herbert
Publisher: name: College Park, MD : American Physical Society
Year: 1997
Subjects: subject: phase transition
subject: Au atoms
subject: Potts model
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The Si(111)-√3×√3-Au phase, which coexists with three-dimensional islands of excess Au at coverages above 1 monolayer and at temperatures above 700 K, is shown to undergo a temperature driven order-disorder phase transition at 1057 K. The islands act as a reservoir of Au atoms and adjust the chemical potential for the two-dimensional layer during the transition. Due to this particle exchange, the phase transition within the √3×√3R30°-Au has been observed for a chemisorbed layer which is not under the usual constraint of constant coverage, but controlled by the chemical potential. We quantitatively analyzed the critical scattering and experimentally determined its critical exponents Β, γ, and ν by high-resolution low-energy electron diffraction. Their values are in good agreement with the expected values of the three-state Potts model, which shows that the transition is continuous without any finite-size effects detectable.
Flying robots for a smarter life
Creators: name: Baba, Abdullatif
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Innovative ideas are continuously emerging to produce better life conditions where essential human needs are supposed to be fulfilled with perfect scenarios leading us to propose modern strategies drawing the future of smart cities. In this context, flying robots are increasingly exploited in many fields to improve the quality of our life. This paper illustrates new designs of flying robots that could be used to perform a variety of advanced missions like investigating the state of high-power lines and manipulating cabling maintenance procedures when failures are detected, evaluating the state of the outer edge of sidewalks to color their partially or wholly erased parts, and spraying pesticides to trees or crops that are affected by different diseases. Creating such smart devices demands developing many other partial designs relying on AI-based algorithms, computer vision techniques, and embedded systems. A variety of techniques that we have recently developed in this field are presented here.
Untersuchungen zur kardialen Differenzierung adulter Stammzellen und Entwicklung lentiviraler Vektoren zur spezifischen Detektion und Aufreinigung von Kardiomyozyten
Creators: name: Gruh, Ina
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Adulte Stammzellen
subject: kardiale Differenzierung
subject: lentivirale Vektoren
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Cosmological Constraints from Galaxy Clustering and the Mass-to-Number Ratio of Galaxy Clusters: Marginalizing over the Physics of Galaxy Formation
Creators: name: Reddick, Rachel
name: Tinker, Jeremy
name: Wechsler, Risa
name: Lu, Yu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Many approaches to obtaining cosmological constraints rely on the connection between galaxies and dark matter. However, the distribution of galaxies is dependent on their formation and evolution as well as the cosmological model, and galaxy formation is still not a well-constrained process. Thus, methods that probe cosmology using galaxies as a tracer for dark matter must be able to accurately estimate the cosmological parameters without knowing the details of galaxy formation a priori. We apply this reasoning to the method of obtaining $Ω_m$ and $σ_8$ from galaxy clustering combined with the mass-to-number ratio of galaxy clusters. To test the sensitivity of this method to variations due to galaxy formation, we consider several different models applied to the same cosmological dark matter simulation. The cosmological parameters are then estimated using the observables in each model, marginalizing over the parameters of the Halo Occupation Distribution (HOD). We find that for models where the galaxies can be well represented by a parameterized HOD, this method can successfully extract the desired cosmological parameters for a wide range of galaxy formation prescriptions.
description: 10 pages, 7 figures, Submitted to ApJ
Epitaxial Graphene Nanoribbons on Bunched Steps of a 6H-SiC(0001) Substrate: Aromatic Ring Pattern and Van Hove Singularities
Creators: name: Ridene, M.
name: Wassmann, T.
name: Pallecchi, E.
name: Rodary, G.
name: Girard, J. C.
name: Ouerghi1, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report scanning tunneling microscopy and spectroscopy investigation of graphene nanoribbons grown on an array of bunched steps of a 6H-SiC(0001) substrate. Our scanning tunneling microscopy images of a graphene nanoribbons on a step terrace feature a (sqrt(3)x sqrt(3))R30° pattern of aromatic rings which define our armchair nanoribbons. This is in agreement to a simulation based on density functional theory. As another signature of the one-dimensional electronic structure, in the corresponding scanning tunneling spectroscopy spectra we find well developed, sharp Van Hove singularities.
Guía: Datos abiertos para Contrataciones Públicas
Creators: name: Loria, Eugenia
Publisher: name: Zenodo
Year: 2019
Subjects: Open Data;
Public Procurement
Open Contracting
Transparency
Open Data Standards

description: Este documento es una introducción general a qué son los datos abiertos y está enfocado a los datos relacionados con Contrataciones. Se espera que este documento sirva como guía para la Dirección de Compras Públicas en la implementación de los datos abiertos en el Sistema Integrado de Compras Públicas (SICOP) y, además sea un incentivo para que la adopción de datos abiertos se difunda entre otras entidades del gobierno.
Umwelthandeln von deutschen Schülern in den USA und in Deutschland : eine vergleichende empirische Studie
Creators: name: Guse, Daniela
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Environmental behaviour
subject: teenagers
subject: cross-cultural study
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie

description: [no abstract]
Improving the Ni I atomic model for solar and stellar atmospheric models
Creators: name: Vieytes, Mariela C.
name: Fontenla, Juan M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Neutral nickel (Ni I) is abundant in the solar atmosphere and is one of the important elements that contribute to the emission and absorption of radiation in the spectral range between 1900 and 3900 A. Previously, the Solar Radiation Physical Modeling (SRPM) models of the solar atmosphere considered only few levels of this species. Here we improve the Ni I atomic model by taking into account 61 levels and 490 spectral lines. We compute the populations of these levels in full NLTE using the SRPM code and compare the resulting emerging spectrum with observations. The present atomic model improves significantly the calculation of the solar spectral irradiance at near-UV wavelengths that are important for Earth atmo spheric studies, and particularly for ozone chemistry.
description: Accepted for publication in The Astrophysical Journal
Calculating Concentratable Entanglement in Graph States
Creators: name: Cullen, Alice R.
name: Kok, Pieter
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a method to calculate the purity of reduced states of graph states entirely within the stabilizer formalism, using only the stabilizer generators for a given state. We apply this method to find the Concentratable Entanglement of graph states, with examples including a single qubit within any graph state, states proposed for use in quantum repeaters and states that maximise and minimise the overall Concentratable Entanglement.
description: 9 pages, 4 figures
Adsorption-site mixing at a continuous order-disorder phase transition
Creators: name: Schwennicke, C.
name: Sandhoff, M.
name: Sklarek, W.
name: Jürgens, D.
name: Pfnür, Herbert
Publisher: name: College Park, MD : American Physical Society
Year: 1995
Subjects: subject: phase transition
subject: DLEED
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The temperature-dependent probability of occupation of the two threefold-coordinated adsorption sites was determined for the system S/Ru(0001) at a coverage of 0.33, analyzing energy-dependent intensity curves [I(E) curves] in low-energy electron diffraction of the ordered 3 × 3 R30° phase and of the disordered system. We show that this probability agrees fully with a lattice gas model containing a finite difference in adsorption energy between these sites. © 1995 The American Physical Society.
The Micro-Arcsecond Scintillation-Induced Variability (MASIV) Survey III. Optical Identifications and New Redshifts
Creators: name: Pursimo, Tapio
name: Ojha, Roopesh
name: Jauncey, David L.
name: Rickett, Barney J.
name: Dutka, Michael S.
name: Koay, Jun Yi
name: Lovell, James E. J.
name: Bignall, Hayley E.
name: Kedziora-Chudczer, Lucyna
name: Macquart, Jean-Pierre
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Intraday variability (IDV) of the radio emission from active galactic nuclei is now known to be predominantly due to interstellar scintillation (ISS). The MASIV (The Micro-Arcsecond Scintillation-Induced Variability) survey of 443 flat spectrum sources revealed that the IDV is related to the radio flux density and redshift. A study of the physical properties of these sources has been severely handicapped by the absence of reliable redshift measurements for many of these objects. This paper presents 79 new redshifts and a critical evaluation of 233 redshifts obtained from the literature. We classify spectroscopic identifications based on emission line properties, finding that 78% of the sources have broad emission lines and are mainly FSRQs. About 16% are weak lined objects, chiefly BL Lacs, and the remaining 6% are narrow line objects. The gross properties (redshift, spectroscopic class) of the MASIV sample are similar to those of other blazar surveys. However, the extreme compactness implied by ISS favors FSRQs and BL Lacs in the MASIV sample as these are the most compact object classes. We confirm that the level of IDV depends on the 5\,GHz flux density for all optical spectral types. We find that BL Lac objects tend to be more variable than broad line quasars. The level of ISS decreases substantially above a redshift of about two. The decrease is found to be generally consistent with ISS expected for beamed emission from a jet that is limited to a fixed maximum brightness temperature in the source rest frame.
description: Accepted for publication by the Astrophysical Journal
Towards a fully consistent Milky Way disk model V. The disk model for 4 $-$ 14 kpc
Creators: name: Sysoliatina, K.
name: Just, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a generalised version of the semi-analytic Just-Jahreiss (JJ) model of the Galactic disk that incorporates our findings for the solar neighbourhood and is applicable to a wide range of galactocentric distances, 4 kpc $\lesssim R \lesssim $ 14 kpc. The JJ model is a flexible tool for stellar population synthesis with a fine age resolution of 25 Myr. It includes six Milky-Way (MW) components: the four flattened (exponential thin and thick disk, atomic and molecular gas) and two spheroidal (spherical stellar halo and a cored isothermal dark matter sphere). The overall thin-disk thickness is assumed to be constant at all radii, though flaring can also be tested. The adopted radial variation in the thin-disk star-formation rate (SFR) reflects the inside-out disk growth scenario. We allow a smooth power-law SFR continuum to be modified by an arbitrary number of Gaussian peaks. We present a public code of the JJ model complemented by the three sets of isochrones (PARSEC, MIST, and BaSTI). Using metallicity distributions of the red clump giants from APOGEE, we constrain the radial variation of the JJ-model age-metallicity relation (AMR) and propose a new analytic form for the AMR function. The generalised JJ model is a publicly available tool for studying different stellar populations across the MW disk. With its fine age resolution and flexibility, it can be particularly useful for reconstructing the thin-disk SFR, as a variety of different SFR shapes can be constructed within its framework.
description: 21 pages, 12 figures, 3 tables. Accepted for publication by A&A
Spin-noise spectroscopy under resonant optical probing conditions: Coherent and nonlinear effects
Creators: name: Horn, H.
name: Müller, G.M.
name: Rasel, Ernst Maria
name: Santos, Luis
name: Hübner, Jens
name: Oestreich, Michael
Publisher: name: College Park, MD : American Physical Society
Year: 2011
Subjects: subject: Bloch equation
subject: Coherent coupling
subject: Collective effects
subject: Detunings
subject: Electronic levels
subject: Faraday rotation spectroscopy
subject: Frequency spectra
subject: High intensity
subject: Highly sensitive
subject: Inhomogeneous broadening
subject: Magnetization noise
subject: Nonlinear effect
subject: Nonresonant
subject: Optical probing
subject: Probe light
subject: Rubidium atoms
subject: Spin noise
subject: Magnetization
subject: Rubidium
subject: Atomic spectroscopy
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Highly sensitive Faraday rotation spectroscopy is used to measure the fluctuating magnetization noise of noninteracting rubidium atoms under resonant and nonresonant optical probing conditions. The spin-noise frequency spectra, in conjunction with the probe light detuning with respect to the D2 transition, reveal clear signatures of coherent coupling of the participating electronic levels. The results are explained by extended Bloch equations, including homogeneous and inhomogeneous broadening mechanisms. Our measurements further indicate that spin noise originating from excited states is governed at high intensities by collective effects. © 2011 American Physical Society.
The dark (BPS) side of thermodynamics in Minkowski$_4$
Creators: name: Hristov, Kiril
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We explore the BPS limit of asymptotically flat black hole thermodynamics, drawing analogies with recent studies of black holes in anti-de Sitter space. Although ultimately motivated by supersymmetry and quantum gravity, the BPS limit is classically well-defined for the dyonic Kerr-Newman black holes in pure Einstein-Maxwell theory and various generalizations with additional scalars and gauge fields that admit embedding in $\mathcal{N}=2$ supergravity (for concreteness we consider the STU model). This limit is manifestly different from extremality as it includes a family of rotating Euclidean saddles that represent a (fictitious) thermal branch, smoothly connected with the extremal static Reissner-Nordström black hole and its generalizations with extra matter. We are able to evaluate unambiguously all BPS chemical potentials, finding constant imaginary angular velocity as a consequence of Wick rotation. In the mixed ensemble of fixed magnetic and varying electric charges, we derive the OSV formula that is crucial for the microscopic understanding of the system, and provide evidence that it should be interpreted as a fixed-point formula.
description: 20 pages, 1 figure, 1 Mathematica file included; v2 minor corrections
Discriminating antiferromagnetic signatures in ultracold fermions by tunable geometric frustration
Creators: name: Chang, Chia-Chen
name: Scalettar, Richard T.
name: Gorelik, Elena V.
name: Blümer, Nils
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recently, it has become possible to tune optical lattices continuously between square and triangular geometries. We compute thermodynamics and spin correlations in the corresponding Hubbard model using determinant quantum Monte Carlo and show that the frustration effects induced by the variable hopping terms can be clearly separated from concomitant bandwidth changes by a proper rescaling of the interaction. An enhancement of the double occupancy by geometric frustration signals the destruction of nontrivial antiferromagnetic correlations at weak coupling and entropy $s\lesssim \ln(2)$ (and restores Pomeranchuk cooling at strong frustration), paving the way to the long-sought experimental detection of antiferromagnetism in ultracold fermions on optical lattices.
description: 5 pages
Transport in selbstorganisierten Silizium/Germanium-Nanostrukturen
Creators: name: Haendel, Kai-Martin
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Self-assembled nanostructures
subject: silicon/germanium
subject: shallow acceptors
subject: current instability
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Individual project on theme "Capreolus Gray, 1821" (MOOC: CompTech in biology)
Creators: name: Bayeva Anastasiya
Publisher: name: Zenodo
Year: 2020

description: Данный кейс является результатом реализации индивидуального проекта Баёвой Анастасии по теме "Capreolus Gray, 1821" в рамках онлайн курса "Компьютерные технологии в биологии" (автор – А.В. Ваганов) (https://stepik.org/course/60859/promo)
Key frames assisted hybrid encoding for photorealistic compressive video sensing
Creators: name: Huang, Honghao
name: Teng, Jiajie
name: Liang, Yu
name: Hu, Chengyang
name: Chen, Minghua
name: Yang, Sigang
name: Chen, Hongwei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Snapshot compressive imaging (SCI) encodes high-speed scene video into a snapshot measurement and then computationally makes reconstructions, allowing for efficient high-dimensional data acquisition. Numerous algorithms, ranging from regularization-based optimization and deep learning, are being investigated to improve reconstruction quality, but they are still limited by the ill-posed and information-deficient nature of the standard SCI paradigm. To overcome these drawbacks, we propose a new key frames assisted hybrid encoding paradigm for compressive video sensing, termed KH-CVS, that alternatively captures short-exposure key frames without coding and long-exposure encoded compressive frames to jointly reconstruct photorealistic video. With the use of optical flow and spatial warping, a deep convolutional neural network framework is constructed to integrate the benefits of these two types of frames. Extensive experiments on both simulations and real data from the prototype we developed verify the superiority of the proposed method.
Spin noise spectroscopy in GaAs (110) quantum wells: Access to intrinsic spin lifetimes and equilibrium electron dynamics
Creators: name: Müller, Georg M.
name: Römer, Michael
name: Schuh, Dieter
name: Wegscheider, Werner
name: Hübner, Jens
name: Oestreich, Michael
Publisher: name: College Park, MD : American Physical Society
Year: 2008
Subjects: subject: Brownian movement
subject: Dynamics
subject: Electrons
subject: Gallium alloys
subject: Quantum well lasers
subject: Semiconducting gallium
subject: Semiconducting indium
subject: Semiconductor quantum wells
subject: Semiconductor quantum wires
subject: Wells
subject: Brownian motions
subject: Electron dynamics
subject: Electron spins
subject: Electron systems
subject: Equilibrium conditions
subject: Intrinsic spins
subject: Line widths
subject: Low temperatures
subject: N-doped
subject: Nondemolition measurements
subject: Probe lasers
subject: Quantum wells
subject: Semiconductor systems
subject: Spatially resolved
subject: Spin noise spectroscopies
subject: Spin relaxations
subject: Total momentums
subject: Spin dynamics
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: In this Letter, the first spin noise spectroscopy measurements in semiconductor systems of reduced effective dimensionality are reported. The nondemolition measurement technique gives access to the otherwise concealed intrinsic, low temperature electron spin relaxation time of n-doped GaAs (110) quantum wells and to the corresponding low temperature anisotropic spin relaxation. The Brownian motion of the electrons within the spin noise probe laser spot becomes manifest in a modification of the spin noise line width. Thereby, the spatially resolved observation of the stochastic spin polarization uniquely allows to study electron dynamics at equilibrium conditions with a vanishing total momentum of the electron system. © 2008 The American Physical Society.
title: Evolution of the droplet shape in the vapor-liquid-solid growth of III-V nanowires under varying material fluxes
Creators: name: Dubrovskii, V.G.
name: Sokolovskii, A.S.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: We present a model for the time evolution of the shape of a droplet catalyzing the vapor-liquid-solid growth of III-V semiconductor nanowires under varying group III or group V fluxes. Under the assumption of a constant radius of the nanowire top, the model gives the time dependence of the droplet contact angle. These results can be used for the fine tuning of the droplet shape, which affects the preferred crystal phase (zincblende or wurtzite) of III-V nanowires.
title: Study of heat dissipating material using boron nitride fabricated by laser ablation
Creators: name: Yamaguchi, Atsushi
name: Koinkar, Pankaj
name: Furube, Akihiro
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: More research interest is developing rapidly on two dimensional (2D) materials owing to their excellent electro-optic properties to develop next generation of electronics and highly functional devices. Among well-known and widely used 2D materials, boron nitride (BN) is an electrical insulator with a band gap of 5.5 eV, and attests high chemical stability, outstanding mechanical properties, and high thermal conductivity. Accordingly, BN is considered as a promising candidate to improve the heat dissipation material performance. In this study, the cooling rate of composite materials of poly methyl methacrylate (PMMA), hexagonal boron nitride (h-BN) and gold nanoparticles was investigated using femtosecond transient absorption spectroscopy. The main objective of this study is to prepare the flexible BN-PMMA films could have a significant impact on heat dissipation to enhance the performance of electronics devices. BN nanostructures were prepared by nanosecond laser ablation in acetone. The laser ablation was carried out at room temperature with laser ablation time of 120 min. The SEM images of bulk BN and laser ablated BN were obtained for structural and surface morphological characterization. Gold colloidal solution was prepared using gold nano-particles with chloroauric acid and distilled water. For the preparation of composite film, PMMA was dissolved in acetone solvent and then mixed with BN and gold colloid solution. The prepared composite films were examined for cooling rate of photoexcited gold nanoparticles using femtosecond transient absorption spectroscopy. It is found that the lifetime is shorter for composite films with Au and high BN content.
Self Sustained Traversable Wormholes Induced by Gravity's Rainbow and Noncommutative Geometry
Creators: name: Garattini, Remo
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compare the effects of Noncommutative Geometry and Gravity's Rainbow on traversable wormholes which are sustained by their own gravitational quantum fluctuations. Fixing the geometry on a well tested model, we find that the final result shows that the wormhole is of the Planckian size. This means that the traversability of the wormhole is in principle, but not in practice.
description: 5 pages, contribution to the proceedings of The Time Machine Factory, Turin, Italy, 14-20 October, 2012
Entwicklung und Optimierung eines Fluoreszenzsensors zum Monitoring von Sauerteigfermentationen
Creators: name: Grote, Bianca
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2011
Subjects: subject: Sourdough fermentation
subject: fluorescence spectroscopy
subject: online process monitoring
subject: multivariate data analysis
subject: Sauerteigfermentation
subject: Fluoreszenzspektroskopie
subject: Onlineprozessbeobachtung
subject: multivariate Datenauswertung
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
Differential top pair cross section and top anti-top plus jets Physics
Creators: name: Worek, Malgorzata
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A brief summary of the current status of the next-to-leading order QCD corrections to top quark pair production and the associated production of top anti-top with jet(s) in different configurations, i.e. with one jet, two jets and another top anti-top pair, is presented.
description: 6 pages, 1 figure, 3 tables, presented at the 5th International Workshop on Top Quark Physics, TOP2012
Productivity meets Performance: Julia on A64FX
Creators: name: Giordano, Mosè
name: Klöwer, Milan
name: Churavy, Valentin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The Fujitsu A64FX ARM-based processor is used in supercomputers such as Fugaku in Japan and Isambard 2 in the UK and provides an interesting combination of hardware features such as Scalable Vector Extension (SVE), and native support for reduced-precision floating-point arithmetic. The goal of this paper is to explore performance of the Julia programming language on the A64FX processor, with a particular focus on reduced precision. Here, we present a performance study on axpy to verify the compilation pipeline, demonstrating that Julia can match the performance of tuned libraries. Additionally, we investigate Message Passing Interface (MPI) scalability and throughput analysis on Fugaku showing next to no significant overheads of Julia of its MPI interface. To explore the usability of Julia to target various floating-point precisions, we present results of ShallowWaters.jl, a shallow water model that can be executed a various levels of precision. Even for such complex applications, Julia's type-flexible programming paradigm offers both, productivity and performance.
description: 7 pages, 8 figures, accepted by EAHPC-2022 - Embracing Arm for High Performance Computing Workshop
Lernziel: Kompetenz : innovatives Lernen in formalen Systemen
Creators: name: Ferdinand, Peter
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Competence of action
subject: learning in formal systems
subject: knots of competence
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::370 | Erziehung, Schul- und Bildungswesen

description: [no abstract]
Micro-machined deep silicon atomic vapor cells
Creators: name: Dyer, S.
name: Griffin, P. F.
name: Arnold, A. S.
name: Mirando, F.
name: Burt, D. P.
name: Riis, E.
name: McGilligan, J. P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Using a simple and cost-effective water jet process, silicon etch depth limitations are overcome to realize a $6\,$mm deep atomic vapor cell. While the minimum silicon feature size was limited to a $1.5\,$mm width in these first generation vapor cells, we successfully demonstrate a two-chamber geometry by including a $\sim$25~mm meandering channel between the alkali pill chamber and main interrogation chamber. We evaluate the impact of the channel conductance on the introduction of alkali vapor density during the pill activation process, and mitigate glass damage and pill contamination near the main chamber. Finally, we highlight the improved signal achievable in the $6\,$mm silicon cell compared to standard $2\,$mm path length silicon vapor cells.
description: 4 pages, 3 figures
Equisetum arvense L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: T. arvense L. Cat. 68. Bis etwa 1750 m. 3: Hohe Stellen: Randa-Rumelen, 1700 m (Huber); Zermatt gegen Zmutt, etwa 1750 m (Thellung 1919). - 3a: Gondoschlucht zwischendem Fort und Gondo (Becherer); Umgebung der Simplonstrasse zwischen Gondo und der italienischen Grenze (idem). - 4: Twingen im Binntal (Schmid); Fiesch-Fürgangen(Wilczek).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Structural modifications of quasi-one-dimensional submonolayers by impurity doping
Creators: name: Godzik, G.
name: Block, T.
name: Pfnür, Herbert
Publisher: name: College Park, MD : American Physical Society
Year: 2004
Subjects: subject: molybdenum
subject: oxide
subject: oxygen
subject: strontium
subject: anisotropy
subject: article
subject: electron diffraction
subject: melting point
subject: oscillation
subject: oxygen concentration
subject: phase transition
subject: quantum mechanics
subject: structure analysis
subject: temperature dependence
subject: thermostability
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: In this study, carried out by analysis of intensities and spot profiles in low energy electron diffraction, we investigated the influence of electronegative oxygen atoms as dopants on the long range order, the thermal stability, and the type of phase transitions in the strongly anisotropic chain system Sr on Mo(112) in the low coverage regime at constant Sr concentrations up to 0.2 monolayers (ML), where the pure Sr layers show p(8 × 1) and p(5 × 1) structures, respectively. A single oxygen atom always influences many unit cells of Sr, as expected from a model of coupling the Sr chains by Friedel oscillations. Whereas concentrations of only 0.02 ML of oxygen transform the p(8 × 1) into a p(9 × 1) structure, small concentrations of oxygen atoms stabilize, but do not alter the p(9 × 1) structure over a wide range of oxygen concentrations. Oxygen induced disappearance of depinning transitions was found already for concentrations above 0.01 ML. For these concentrations only melting transitions are still observed. In a concentration range of oxygen and Sr atoms between 1:2 and 1:1 incommensurate structures are formed yielding finally islands of a (3.3 × 1) structure in all cases, interpreted as a sign of beginning formation of mixed oxides. Implications for adsorbate induced structuring of templates are discussed.
Periodic variable A-F spectral type stars in the northern TESS continuous viewing zone
Creators: name: Skarka, M.
name: Žák, J.
name: Fedurco, M.
name: Paunzen, E.
name: Henzl, Z.
name: Mašek, M.
name: Karjalainen, R.
name: Arias, J. P. Sanchez
name: Sódor, Á.
name: Auer, R. F.
name: Kabáth, P.
name: Karjalainen, M.
name: Liška, J.
name: Štegner, D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The goal of our study is to provide a reliable classification of variability of A-F stars brighter than 11 mag located in the northern TESS continuous viewing zone. We also aim at thorough discussion about issues in the classification related to the data characteristics and the issues arising from the similar light curve shape generated by different physical mechanisms. We used TESS long- and short-cadence photometric data and corresponding Fourier transform to classify the variability type of the stars. We present a clear and concise classification system that is demonstrated on many examples. We found clear signs of variability in 3025 of 5923 studied stars (51 %). For 1813 of these 3025 stars, we provide a classification. From the classified stars, 64.5 % are pulsating stars of GDOR and DSCT types and their hybrids. We realised that the long- and short-cadence PDCSAP data can differ significantly not only in amplitudes but also in the content of instrumental/data reduction artifacts making the long-cadence data less reliable. We identified a new group of stars showing stable light curves and characteristic frequency spectra pattern (8.5 % of the classified stars). According to the position in the Hertzsprung-Russell diagram, these stars are likely GDOR stars but are about 200 K cooler than GDORs on average and have smaller amplitudes and longer periods in average. We show that without spectroscopic observations, it can be impossible to unambiguously distinguish between ellipsoidal variability and rotational variability. We also apply our methodology to three previous studies and found significant discrepancies in the classification. We demonstrate how difficult the classification of variable A-F stars can be when using only photometric data.
description: Accepted for publication in A&A, 23 pages, 17 figures, 5 tables
Two-timescale evolution on a singular landscape
Creators: name: Xu, Song
name: Jiao, Shuyun
name: Jiang, Pengyao
name: Ao, Ping
Publisher: name: arXiv
Year: 2013
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Under the effect of strong genetic drift, it is highly probable to observe gene fixation or gene loss in a population, shown by infinite peaks on a coherently constructed potential energy landscape. It is then important to ask what such singular peaks imply, with or without the effects of other biological factors. We studied the stochastic escape time from the infinite potential peaks in the Wright-Fisher model, where the typical two-scale diffusion dynamics was observed via computer simulations. We numerically found the average escape time for all the bi-stable cases and analytically approximated the results under weak mutations and selections by calculating the mean first passage time (MFPT) in singular potential peak. Our results showed that Kramers' classical escape formula can be extended to the models with non-Gaussian probability distributions, overcoming constraints in previous methods. The constructed landscape provides a global and coherent description for system's evolutionary dynamics, allowing new biological results to be generated.
description: arXiv admin note: text overlap with arXiv:1108.1484
title: Comparative study of adsorption of ozone molecule on pristine and Si doped Single Wall Carbon Nanotube by density functional theory
Creators: name: Atram, R.G.
name: Sonawane, M.R.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: We report comparative study of ozone adsorption on pristine Single Walled Carbon Nanotube (SWCNT) (8, 0) and Silicon doped Single walled Carbon Nanotube (Si – SWCNT) by density functional theory calculations based on DeMol3 code. Importance is given to the effects of silicon doping in carbon nanotube for comparative study of adsorption of ozone. The results show that silicon doping keeps the semiconducting character of pure carbon nanotubes with reduction in band gap from 0.71 eV to 0.54 eV. The ozone gas molecule is physisorbed with binding energy 0.431eV and minute charge transfer of 0.013 e from pure carbon nanotube, consistent with the strong oxidizing nature of ozone. The binding energy and charge transfer indicate that the ozone adsorption on pure carbon nanotube is gentle and reversible. However, when ozone adsorbs on silicon doped carbon nanotube, a strong chemisorption occurs, leading to relevant structural relaxations and to the formation of a Si-O σ bond with binding energy 3.902 eV and charge transfer of 0.252 e. The band structure and density of states shows that the occupancy state in valence band near Fermi
energy is completely altered due to ozone adsorption. The charge density analysis also shows formation of sigma bond between silicon and oxygen atoms. The charge density iso-surface shows the oxidation of silicon atom and dissociation of ozone molecule into silicon - oxide and releasing of oxygen molecule.
Magnetotransport in graphene/Pb0.24Sn0.76Te heterostructures: finding a way to avoid catastrophe
Creators: name: Stephen, Gregory M.
name: Naumov, Ivan
name: Blumenschein, Nicholas A.
name: Sun, Yi-Jan Leo
name: DeMell, Jennifer E.
name: Shirodkar, Sharmila
name: Dev, Pratibha
name: Taylor, Patrick J.
name: Robinson, Jeremy T.
name: Campbell, Paul M.
name: Hanbicki, Aubrey T.
name: Friedman, Adam L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: While heterostructures are ubiquitous tools enabling new physics and device functionalities, the palette of available materials has never been richer. Combinations of two emerging material classes, two-dimensional materials and topological materials, are particularly promising because of the wide range of possible permutations that are easily accessible. Individually, both graphene and Pb0.24Sn0.76Te (PST) are widely investigated for spintronic applications because graphene's high carrier mobility and PST's topologically protected surface states are attractive platforms for spin transport. Here, we combine monolayer graphene with PST and demonstrate a hybrid system with properties enhanced relative to the constituent parts. Using magnetotransport measurements, we find carrier mobilities up to 20,000 cm2/Vs and a magnetoresistance approaching 100 percent, greater than either material prior to stacking. We also establish that there are two distinct transport channels and determine a lower bound on the spin relaxation time of 4.5 ps. The results can be explained using the polar catastrophe model, whereby a high mobility interface state results from a reconfiguration of charge due to a polar/non-polar interface interaction. Our results suggest that proximity induced interface states with hybrid properties can be added to the still growing list of remarkable behaviors in these novel materials.
Experimental simulation of Titan's stratospheric photochemistry: benzene (C6H6) ices
Creators: name: J. Mouzay, T. Chiavassa
name: I. Couturier-Tamburelli,
name: N. Piétri,
name: T. Chiavassa
Publisher: name: Zenodo
Year: 2020
Subjects: Titan,
benzene ice,
photochemistry

description: Titan, often compared to the early Earth, is the only moon in the solar system to have a dense atmosphere, mainly composed of nitrogen and methane. In the upper part of the atmosphere (>1000 km), UV photons, photoelectrons, energetic ions and magnetospheric electrons induce the dissociation and the ionization of N2 and methane. These reactions lead to the formation of complex organic molecules - including hydrocarbons such as benzene - and aerosols in the high atmosphere (an organic haze responsible for Titan’s brownish color), which are subject to different UV radiation classes depending on the altitude. Therefore, during their sedimentation toward the surface, these organic photoproducts are known to be modified. Once the tropopause is reached, molecules like benzene (C6H6) condense and evolve under long UV radiations to contribute to aerosol formation.
Temperaturbedingte Beanspruchung von Betonfahrbahnen
Creators: name: Förster, Marc-Oliver
Publisher: name: Hannover : Universität
Year: 2005
Subjects: subject: Concrete
subject: blow-up
subject: failure
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Searching for intrinsic charm in the proton at the LHC
Creators: name: Bednyakov, V. A.
name: Demichev, M. A.
name: Lykasov, G. I.
name: Stavreva, T.
name: Stockton, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Despite rather long-term theoretical and experimental studies, the hypothesis of the non-zero intrinsic (or valence-like) heavy quark component of the proton distribution functions has not yet been confirmed or rejected. The LHC with $pp$-collisions at $\sqrt{s}=$ 7--14 TeV will obviously supply extra unique information concerning the above-mentioned component of the proton. To use the LHC potential, first of all, one should select the parton-level (sub)processes (and final-state signatures) that are most sensitive to the intrinsic heavy quark contributions. To this end inclusive production of $c(b)$-jets accompanied by photons is considered. On the basis of the performed theoretical study it is demonstrated that the investigation of the intrinsic heavy quark contributions looks very promising at the LHC in processes such as $pp\rightarrow γ+ c(b)+X$.
description: 13 pages, 6 figures
Towards an "AdS$_1/$CFT$_0$" correspondence from the D$(-1)/$D$7$ system?
Creators: name: Aguilar-Gutierrez, Sergio E.
name: Parmentier, Klaas
name: Van Riet, Thomas
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We argue that a type IIB Euclidean supergravity solution of the form $\mathbb{R}\times S^1\times \mathbb{T}^8$ with imaginary self-dual $F_1$ flux through $\mathbb{R}\times S^1$ belongs to the chain of $AdS_d\times S^d\times \mathbb{T}^{10-2d}$ vacua with (imaginary) self-dual $F_d$ flux, where $d\leq 5$. Such vacua come from the near-horizon of D$(d-2)$/D$(8-d)$ branes and are supersymmetric for odd values of $d$. For $d=1$ we speculate that the hallmark of conformal symmetry for the matrix model dual is a vanishing free energy. The matrix dual was recently constructed by arXiv:2101.01732 by adding matrix interactions coming from strings stretching between the D$(-1)$ and D$7$ branes to the IKKT matrix model. We find that the corresponding supergravity solution indeed has vanishing on-shell action. Specific $F_5$ fluxes need to be switched on as a consequence of (a T-dual version of) the Hanany-Witten effect.
description: Minor corrections added. Accepted version in JHEP
title: Effect of warm rolling on microstructure, porosity, and hardness of a spray-formed LM25 aluminum alloy
Creators: name: Ramana Reddy, Bandi Venkata
name: Maity, S.R.
name: Pandey, K.M.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019

description: The LM25 aluminum alloy was obtained using the spray deposition method at an optimum pressure of approximately 10 bar, a deposition distance of approximately 41 cm. and an inclination angle of 0º. The central portion of the spray deposit was warm rolled to obtain various thickness reductions, i.e., 0%, 20%, 40%, 60%, and 80% at 100ºC; it was found that the number of pores decreased as the thickness reduction increased. It was observed that the fine microstructure and secondary phase in the samples with a larger percentage of thickness reduction was due to the expediting cooling and freezing rate of the molten metal. The porosity and mechanical properties were better in the spray deposited and warmed rolled LM 25 substrate than the cast LM25 alloy.