cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Higgs condensation as an unwanted curvaton
Creators: name: Kunimitsu, Taro
name: Yokoyama, Jun'ichi
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: During inflation in the early universe, the Higgs field continuously acquires long-wave quantum fluctuations. They accumulate to yield a non-vanishing value with an exponentially large correlation length. We study consequences of such Higgs condensations to show that, in inflation models where the universe is reheated through gravitational particle production at the transition to the kination regime, they not only contribute to reheat the universe but also act as a curvaton. Unfortunately, however, for parameters of the Standard Model Higgs field, this curvaton produces density fluctuations too large, so the inflation models followed by a long kination regime are ruled out.
description: 13 pages; v2, layout adjusted, references added
Are hydrodynamic interactions important in the kinetics of hydrophobic collapse?
Creators: name: Li, Jingyuan
name: Morrone, Joseph A.
name: Berne, B. J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We study the kinetics of assembly of two plates of varying hydrophobicity, including cases where drying occurs and water strongly solvates the plate surfaces. The potential of mean force and molecular-scale hydrodynamics are computed from molecular dynamics simulations in explicit solvent as a function of particle separation. In agreement with our recent work on nanospheres [J. Phys. Chem. B 116, 378 (2012)] regions of high friction are found to be engendered by large and slow solvent fluctuations. These slow fluctuations can be due to either drying or confinement. The mean first passage times for assembly are computed by means of molecular dynamics simulations in explicit solvent and by Brownian dynamics simulations along the reaction path. Brownian dynamics makes use of the potential of mean force and hydrodynamic profile that we determined. Surprisingly, we find reasonable agreement between full scale molecular dynamics and Brownian dynamics, despite the role of slow solvent relaxation in the assembly process. We found that molecular scale hydrodynamic interactions are essential in describing the kinetics of assembly.
description: 6 figures, 13 pages
Chandra Observations of 3C Radio Sources with z<0.3 II: completing the snapshot survey
Creators: name: Massaro, F.
name: Tremblay, G. R.
name: Harris, D. E.
name: Kharb, P.
name: Axon, D.
name: Balmaverde, B.
name: Baum, S. A.
name: Capetti, A.
name: Chiaberge, M.
name: Gilli, R.
name: Giovannini, G.
name: Grandi, P.
name: Macchetto, F. D.
name: O'Dea, C. P.
name: Risaliti, G.
name: Sparks, W.
name: Torresi, E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the second round of Chandra observations of the 3C snapshot survey developed to observe the complete sample of 3C radio sources with z<0.3 for 8 ksec each. In the first paper, we illustrated the basic data reduction and analysis procedures performed for the 30 sources of the 3C sample observed during the Chandra Cycle 9, while here, we present the data for the remaining 27 sources observed during Cycle 12. We measured the X-ray intensity of the nuclei and of any radio hotspots and jet features with associated X-ray emission. X-ray fluxes in three energy bands: soft, medium and hard for all the sources analyzed are also reported. For the stronger nuclei, we also applied the standard spectral analysis which provides the best fit values of X-ray spectral index and absorbing column density. In addition, a detailed analysis of bright X-ray nuclei that could be affected by pileup has been performed. X-ray emission was detected for all the nuclei of the radio sources in our sample except for 3C 319. Amongst the current sample, there are two compact steep spectrum radio sources; two broad line radio galaxies; and one wide angle tail radio galaxy, 3C 89, hosted in a cluster of galaxies clearly visible in our Chandra snapshot observation. In addition, we also detected soft X-ray emission arising from the galaxy cluster surrounding 3C 196.1. Finally, X-ray emission from hotspots have been found in three FR II radio sources and, in the case of 3C 459, we also report the detection of X-ray emission associated with the eastern radio lobe and as well as that cospatial with radio jets in 3C 29 and 3C 402.
description: 53 pages, 33 figures, 5 tables, accepted for publication on the ApJ Supplement Series
Entwicklung von schichtweise ausgerichteten Faserverbundstrukturen
Creators: name: Rittinghaus, Tim
name: Zernetsch, Holger
name: Glasmacher, Birgit
Publisher: name: Berlin : Walter de Gruyter
Year: 2013
Subjects: subject: Tissue Engineering
subject: Herzklappenscaffold
subject: ausgerichtete Fasern
subject: Schichtstruktur
subject: Gapspinning
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: Jedes Jahr müssen tausende defekte Herzklappen ersetzt werden. Die Verwendung von biologischen oder mechanischen Prothesen macht aufgrund der Tatsache, dass diese nicht mitwachsen, gerade bei Heranwachsenden regelmäßige Reimplantationen erforderlich. Eine mögliche Alternative sind Klappenprothesen bestehend aus einer Gerüststruktur, welche mit körpereigenen Zellen besiedelt wird. Das Gerüst wird im Laufe der Zeit vollständig durch lebendes Gewebe ersetzt. Ziel dieser Diplomarbeit ist die Herstellung von schichtweise ausgerichteten Faserverbundstrukturen, um zukünftig den aus mehreren Gewebeschichten bestehenden Aufbau der menschlichen Herzklappen nachahmen zu können und den Zellen so eine optimale Trägerstruktur bereit zu stellen.
Gas surface density, star formation rate surface density, and the maximum mass of young star clusters in a disk galaxy. I. The flocculent galaxy M33
Creators: name: Gonzalez-Lopezlira, Rosa A.
name: Pflamm-Altenburg, Jan
name: Kroupa, Pavel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyze the relationship between maximum cluster mass, M_max, and surface densities of total gas (Sigma_gas), molecular gas (Sigma_H2) and star formation rate (Sigma_SFR) in the flocculent galaxy M33, using published gas data and a catalog of more than 600 young star clusters in its disk. By comparing the radial distributions of gas and most massive cluster masses, we find that M_max is proportional to Sigma_gas^4.7, M_max is proportional Sigma_H2^1.3, and M_max is proportional to Sigma_SFR^1.0. We rule out that these correlations result from the size of sample; hence, the change of the maximum cluster mass must be due to physical causes.
description: accepted for publication in ApJ
AKARI/IRC 18 Micron Survey of Warm Debris Disks
Creators: name: Fujiwara, Hideaki
name: Ishihara, Daisuke
name: Onaka, Takashi
name: Takita, Satoshi
name: Kataza, Hirokazu
name: Yamashita, Takuya
name: Fukagawa, Misato
name: Ootsubo, Takafumi
name: Hirao, Takanori
name: Enya, Keigo
name: Marshall, Jonathan P.
name: White, Glenn J.
name: Nakagawa, Takao
name: Murakami, Hiroshi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Little is known about the properties of the warm (Tdust >~ 150 K) debris disk material located close to the central star, which has a more direct link to the formation of terrestrial planets than the low temperature debris dust that has been detected to date. Aims. To discover new warm debris disk candidates that show large 18 micron excess and estimate the fraction of stars with excess based on the AKARI/IRC Mid-Infrared All-Sky Survey data. Methods. We have searched for point sources detected in the AKARI/IRC All-Sky Survey, which show a positional match with A-M dwarf stars in the Tycho-2 Spectral Type Catalogue and exhibit excess emission at 18 micron compared to that expected from the Ks magnitude in the 2MASS catalogue. Results. We find 24 warm debris candidates including 8 new candidates among A-K stars. The apparent debris disk frequency is estimated to be 2.8 +/- 0.6%. We also find that A stars and solar-type FGK stars have different characteristics of the inner component of the identified debris disk candidates --- while debris disks around A stars are cooler and consistent with steady-state evolutionary model of debris disks, those around FGK stars tend to be warmer and cannot be explained by the steady-state model.
description: 15 pages, 4 figures, accepted for publication in Astronomy & Astrophysics
Generalized Hurst exponent and multifractal function of original and translated texts mapped into frequency and length time series
Creators: name: Ausloos, Marcel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: A nonlinear dynamics approach can be used in order to quantify complexity in written texts. As a first step, a one-dimensional system is examined : two written texts by one author (Lewis Carroll) are considered, together with one translation, into an artificial language, i.e. Esperanto are mapped into time series. Their corresponding shuffled versions are used for obtaining a "base line". Two different one-dimensional time series are used here: (i) one based on word lengths (LTS), (ii) the other on word frequencies (FTS). It is shown that the generalized Hurst exponent $h(q)$ and the derived $f(α)$ curves of the original and translated texts show marked differences. The original "texts" are far from giving a parabolic $f(α)$ function, - in contrast to the shuffled texts. Moreover, the Esperanto text has more extreme values. This suggests cascade model-like, with multiscale time asymmetric features as finally written texts. A discussion of the difference and complementarity of mapping into a LTS or FTS is presented. The FTS $f(α)$ curves are more opened than the LTS ones
description: preprint for PRE; 2 columns; 10 pages; 6 (multifigures); 3 Tables; 70 references
Broadband probing magnetization dynamics of the coupled vortex state permalloy layers in nanopillars
Creators: name: Awad, Ahmad A.
name: Lara, Antonio
name: Metlushko, Vitali
name: Guslienko, Konstantin Y.
name: Aliev, Farkhad G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Broadband magnetization response of coupled vortex state magnetic dots in layered nanopillars was explored as a function of in-plane magnetic field and interlayer separation. For dipolarly coupled circular Py(25 nm)/Cu(20 nm)/Py(25 nm) nanopillars of 600 nm diameter, a small in-plane field splits the eigenfrequencies of azimuthal spin wave modes inducing an abrupt transition between in-phase and out-of-phase kinds of the low-lying coupled spin wave modes. The critical field for this splitting is determined by antiparallel chiralities of the vortices in the layers. Qualitatively similar (although more gradual) changes occur also in the exchange coupled Py(25 nm)/Cu(1 nm)/Py(25 nm) tri-layer nanopillars. These findings are in qualitative agreement with micromagnetic dynamic simulations.
The Radio Light Curve of the Gamma-Ray Nova in V407 Cyg: Thermal Emission from the Ionized Symbiotic Envelope, Devoured from Within by the Nova Blast
Creators: name: Chomiuk, Laura
name: Krauss, Miriam I.
name: Rupen, Michael P.
name: Nelson, Thomas
name: Roy, Nirupam
name: Sokoloski, Jennifer L.
name: Mukai, Koji
name: Munari, Ulisse
name: Mioduszewski, Amy
name: Weston, Jennifer
name: O'Brien, Tim J.
name: Eyres, Stewart P. S.
name: Bode, Michael F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present multi-frequency radio observations of the 2010 nova event in the symbiotic binary V407 Cygni, obtained with the Karl G. Jansky Very Large Array and spanning 1-45 GHz and 17-770 days following discovery. This nova---the first ever detected in gamma rays---shows a radio light curve dominated by the wind of the Mira giant companion, rather than the nova ejecta themselves. The radio luminosity grew as the wind became increasingly ionized by the nova outburst, and faded as the wind was violently heated from within by the nova shock. This study marks the first time that this physical mechanism has been shown to dominate the radio light curve of an astrophysical transient. We do not observe a thermal signature from the nova ejecta or synchrotron emission from the shock, due to the fact that these components were hidden behind the absorbing screen of the Mira wind. We estimate a mass loss rate for the Mira wind of Mdot_w ~ 10^-6 M_sun/yr. We also present the only radio detection of V407 Cyg before the 2010 nova, gleaned from unpublished 1993 archival VLA data, which shows that the radio luminosity of the Mira wind varies by a factor of >~20 even in quiescence. Although V407 Cyg likely hosts a massive accreting white dwarf, making it a candidate progenitor system for a Type Ia supernova, the dense and radially continuous circumbinary material surrounding V407 Cyg is inconsistent with observational constraints on the environments of most Type Ia supernovae.
description: Resubmitted to ApJ after incorporating referee's comments
Research software services: FG-SOL : access & preservation for research software
Creators: name: Gomez-Diaz, Teresa
name: Legoll, Vincent
name: Sorina Camarasu-Pop, Sorina
name: Romier, Genevieve
name: Pansanel, Jérôme
Publisher: name: Zenodo
Year: 2017
Subjects: infrastructures for research, open science, research software, rerpoducibility, access to research outputs, free/oepn access, shared knowledge

description: In this poster we present our vision of access and preservation services to be proposed to research software, that is to software and codes developed in the laboratories and research institutions and that have an active role in the production process of published results. The goal is to build the necessary environment where research software can be discovered, studied and re-used by other researchers in order to validate and reproduce published results, or to be used for new research purposes, which will produce new knowledge. This is a collaborative work developed by members of CNRS, EGI.eu, IASA and the University of Edinburgh presented as a H2020 proposal in march 2016. Under the name of FG-SOL, France Grilles is currently setting up these services for the French research communities in all disciplines. On the one hand, FG-SOL services allow researchers of the French communities to propose the software they have conceived in a portal where it can be discovered, tested, used and studied. On the other hand, FG-SOL provides an environment that enables the discovery and the exploration of research software in all domains while making possible its testing and execution on the France Grilles infrastructure. The technical architecture is based on the France Grilles existing services and resources. FG-SOL relies on a portal based on its own VIP instance that uses the France Grilles DIRAC instance to execute jobs on the IPHC cloud resources. VIP software (Virtual Imaging Platform) is developed by CREATIS and is already used in the production environment dedicated to the medical imaging community (https://vip.creatis.insa-lyon.fr) currently running on the EGI infrastructure. FG-SOL services are to be extended to European level with the collaboration with our partners and aims to be linked with existing e-infrastructures.
Three essays on social network using field experiments
Creators: name: ZHANG, XIN
Publisher: name: Monash University
Year: 2021
Subjects: subject: 140206 Experimental Economics
subject: FOS: Economics and business
subject: 140202 Economic Development and Growth

description: This thesis studies the role of social networks in influencing economic activities using three self-contained chapters. Chapter 1 examines the importance of social networks in promoting technology adoption. Chapter 2 explores the role of network structure in education spillovers. Chapter 3 studies the role of peer effects in promoting educational outcomes. Regarding all three studies, we provide both theoretical models and empirical evidence to support our arguments. And we show that social networks matter in influencing people’s decisions in economic activities.
Gaseous Galaxy Halos
Creators: name: Putman, M. E.
name: Peek, J. E. G.
name: Joung, M. R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Galactic halo gas traces inflowing star formation fuel and feedback from a galaxy's disk and is therefore crucial to our understanding of galaxy evolution. In this review, we summarize the multi-wavelength observational properties and origin models of Galactic and low redshift spiral galaxy halo gas. Galactic halos contain multiphase gas flows that are dominated in mass by the ionized component and extend to large radii. The densest, coldest halo gas observed in neutral hydrogen (HI) is generally closest to the disk (< 20 kpc), and absorption line results indicate warm and warm-hot diffuse halo gas is present throughout a galaxy's halo. The hot halo gas detected is not a significant fraction of a galaxy's baryons. The disk-halo interface is where the multiphase flows are integrated into the star forming disk, and there is evidence for both feedback and fueling at this interface from the temperature and kinematic gradient of the gas and HI structures. The origin and fate of halo gas is considered in the context of cosmological and idealized local simulations. Accretion along cosmic filaments occurs in both a hot (> 10^5.5 K) and cold mode in simulations, with the compressed material close to the disk the coldest and densest, in agreement with observations. There is evidence in halo gas observations for radiative and mechanical feedback mechanisms, including escaping photons from the disk, supernova-driven winds, and a galactic fountain. Satellite accretion also leaves behind abundant halo gas. This satellite gas interacts with the existing halo medium, and much of this gas will become part of the diffuse halo before it can reach the disk. The accretion rate from cold and warm halo gas is generally below a galaxy disk's star formation rate, but gas at the disk-halo interface and stellar feedback may be important additional fuel sources.
description: 50 pages, 9 figures (1 in 3D, view with a current version of Adobe), to appear in ARA&A, 50, 491
Random field sampling for a simplified model of melt-blowing considering turbulent velocity fluctuations
Creators: name: Hübsch, Florian
name: Marheineke, Nicole
name: Ritter, Klaus
name: Wegener, Raimund
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 34Fxx, 60G60, 65Cxx, 74Kxx, 76Fxx

description: In melt-blowing very thin liquid fiber jets are spun due to high-velocity air streams. In literature there is a clear, unsolved discrepancy between the measured and computed jet attenuation. In this paper we will verify numerically that the turbulent velocity fluctuations causing a random aerodynamic drag on the fiber jets -- that has been neglected so far -- are the crucial effect to close this gap. For this purpose, we model the velocity fluctuations as vector Gaussian random fields on top of a k-epsilon turbulence description and develop an efficient sampling procedure. Taking advantage of the special covariance structure the effort of the sampling is linear in the discretization and makes the realization possible.
Pulsation models for the 0.26M_sun star mimicking RR Lyrae pulsator. Model survey for the new class of variable stars
Creators: name: Smolec, R.
name: Pietrzynski, G.
name: Graczyk, D.
name: Pilecki, B.
name: Gieren, W.
name: Thompson, I.
name: Stepien, K.
name: Karczmarek, P.
name: Konorski, P.
name: Gorski, M.
name: Suchomska, K.
name: Bono, G.
name: Moroni, P. G. Prada
name: Nardetto, N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present non-linear hydrodynamic pulsation models for OGLE-BLG-RRLYR-02792 - a 0.26M_sun pulsator, component of the eclipsing binary system, analysed recently by Pietrzynski et al. The star's light and radial velocity curves mimic that of classical RR Lyrae stars, except for the bump in the middle of the ascending branch of the radial velocity curve. We show that the bump is caused by the 2:1 resonance between the fundamental mode and the second overtone - the same mechanism that causes the Hertzsprung bump progression in classical Cepheids. The models allow to constrain the parameters of the star, in particular to estimate its absolute luminosity (approx 33L_sun) and effective temperature (approx 6970K, close to the blue edge of the instability strip). We conduct a model survey for the new class of low mass pulsators similar to OGLE-BLG-RRLYR-02792 - products of evolution in the binary systems. We compute a grid of models with masses corresponding to half (and less) of the typical mass of RR Lyrae variable, 0.20M_sun<=M<=0.30M_sun, and discuss the properties of the resulting light and radial velocity curves. Resonant bump progression is clear and may be used to distinguish such stars from classical RR Lyrae stars. We present the Fourier decomposition parameters for the modelled light and radial velocity curves. The expected values of the phi_31 Fourier phase for the light curves differ significantly from that observed in RR Lyrae stars, which is another discriminant of the new class.
description: 15 pages, 14 figures, accepted for publication in MNRAS
Soliton generation by counteracting gain-guiding and self-bending
Creators: name: Lobanov, Valery E.
name: Kartashov, Yaroslav V.
name: Vysloukh, Victor A.
name: Torner, Lluis
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We introduce a new concept for stable spatial soliton formation, mediated by the competition between self-bending induced by a strongly asymmetric nonlocal nonlinearity and spatially localized gain superimposed on a wide pedestal with linear losses. When acting separately both effects seriously prevent stable localization of light, but under suitable conditions they counteract each other, forming robust soliton states that are attractors for a wide range of material and input light conditions.
description: 4 pages, 4 figures
The greatest Ricci lower bound, conical Einstein metrics and the Chern number inequality
Creators: name: Song, Jian
name: Wang, Xiaowei
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: We partially confirm a conjecture of Donaldson relating the greatest Ricci lower bound $R(X)$ to the existence of conical Kahler-Einstein metrics on a Fano manifold $X$. In particular, if $D\in |-K_X|$ is a smooth simple divisor and the Mabuchi $K$-energy is bounded below, then there exists a unique conical Kahler-Einstein metric satisfying $Ric(g) = βg + (1-β) [D]$ for any $β\in (0,1)$. We also construct unique smooth conical toric Kahler-Einstein metrics with $β=R(X)$ and a unique effective Q-divisor $D\in [-K_X]$ for all toric Fano manifolds. Finally we prove a Miyaoka-Yau type inequality for Fano manifolds with $R(X)=1$.
Third quantization: modeling the universe as a 'particle' in a quantum field theory of the minisuperspace
Creators: name: Robles-Pérez, S. J.
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: The third quantization formalism of quantum cosmology adds simplicity and conceptual insight into the quantum description of the multiverse. Within such a formalism, the existence of squeezed and entangled states raises the question of whether the complementary principle of quantum mechanics has to be extended to the quantum description of the whole space-time manifold. If so, the 'particle' description entails the consideration of a multiverse scenario and the 'wave' description induces us to consider as well correlations and interactions among the universes of the multiverse.
description: 4 pages. Proceedings of the International Conference on Mathematical Modeling in Physical Sciences, September 3-7, 2012, Budapest, Hungary
Lessons from the Synthetic Chemist Nature
Creators: name: Juerjens, Gerrit
name: Kirschning, Andreas
name: Candito, David A.
Publisher: name: Cambridge : Royal Society of Chemistry
Year: 2015
Subjects: subject: asymmetric total-synthesis
subject: one-pot preparation
subject: organic-synthesis
subject: isotactic polymethoxy-1-alkenes
subject: enantioselective hydrogenation
subject: polyketide synthases
subject: product synthesis
subject: ideal synthesis
subject: step economy
subject: biosynthesis
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: This conceptual review examines the ideal multistep synthesis from the perspective of nature. We suggest that besides step- and redox economies, one other key to efficiency is steady state processing with intermediates that are immediately transformed to the next intermediate when formed. We discuss four of nature's strategies (multicatalysis, domino reactions, iteration and compartmentation) that commonly proceed via short-lived intermediates and show that these strategies are also part of the chemist's portfolio. We particularly focus on compartmentation which in nature is found microscopically within cells (organelles) and between cells and on a molecular level on multiprotein scaffolds (e.g. in polyketide synthases) and demonstrate how compartmentation is manifested in modern multistep flow synthesis.
VU Data Conversations: Enhancing transparency in research using preregistration
Creators: name: Miedzobrodzka, Ewa
Publisher: name: Zenodo
Year: 2021
Subjects: preregistration
Open Science
Open Science Community Amsterdam
Data Conversations

description: Presentation given at the Data Conversations held at the Vrije Universiteit Amsterdam and organised by the VU University Library on 16 June 2021. The theme of this edition was "Enhancing transparency in research using preregistration". A recording of the presentation can be viewed on the VU University Library channel. Versions of the slides are also available on the Open Science Framework. Agenda: Ewa Miedzobrodzka, "How to increase transparency in research with pre-registration: an ERP study example" About Data Conversations Data Conversations started at the University of Lancaster in the UK. The Lancaster Data Conversations aim to bring data practitioners together to talk about how researchers create, collect, use and share data. The Data Conversations at the VU Amsterdam share the same aim and are intended to provide a forum for researchers from different subjects and disciplines to exchange practices and ideas around open data, FAIR data, research data management and related open science topics.
A measurement of the intrahalo light fraction with near-infrared background anisotropies
Creators: name: Cooray, Asantha
name: Smidt, Joseph
name: De Bernardis, Francesco
name: Gong, Yan
name: Stern, Daniel
name: Ashby, Matthew L. N.
name: Eisenhardt, Peter R.
name: Frazer, Christopher C.
name: Gonzalez, Anthony H.
name: Kochanek, Christopher S.
name: Kozlowski, Szymon
name: Wright, Edward L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Unresolved near-infrared background anisotropies are expected to have contributions from the earliest galaxies during reionization and faint, dwarf galaxies at intermediate redshifts. Previous measurements were unable to conclusively pinpoint the dominant origin because they did not sample spatial scales that were sufficiently large to distinguish between these two possibilities. Here we report a measurement of the anisotropy power spectrum from sub-arcminute to one degree angular scales and find the clustering amplitude to be larger than the model predictions involving the two existing explanations. As the shot-noise level of the power spectrum is consistent with that expected from faint galaxies, a new source population on the sky is not necessary to explain the observations. A physical mechanism that increases the clustering amplitude, however, is needed. Motivated by recent results related to the extended stellar light profile in dark matter halos, we consider the possibility that the fluctuations originate from diffuse intrahalo stars of all galaxies. We find that the measured power spectrum can be explained by an intrahalo light fraction of 0.07 to 0.2 % relative to the total luminosity in dark matter halos of masses log(M/M_Sun) ~ 9 to 12 at redshifts of ~ 1 to 4.
description: To appear in this week's issue of Nature (25 October) ; Under press embargo till 24 Oct 2012 1 PM EST. This preprint is the submitted version to Nature. Please see Nature for the final version, which includes editorial corrections and the revised title. This preprint will be updated with the final version in six months after publication. Data and details available from http://herschel.uci.edu
VU Data Conversations: Anonymising Research Data
Creators: name: Terrovitis, Manolis
Publisher: name: Zenodo
Year: 2021
Subjects: data anonymisation
Amnesia
Open Science

description: Presentations given at the Data Conversations held at the Vrije Universiteit Amsterdam and organised by the VU University Library on 12 May 2021. The theme of this edition was "Anonymising Research Data". This session of the Data Conversations was a collaboration between VU Data Conversations and the ReproducibiliTea Journal Club. A recording of the presentation can be viewed on the VU University Library channel. Agenda: Elisa Rodenburg, "Data anonymisation at the VU" Manolis Terrovitis, "Amnesia - Data Anonymisation Made Easy" About Data Conversations Data Conversations started at the University of Lancaster in the UK. The Lancaster Data Conversations aim to bring data practitioners together to talk about how researchers create, collect, use and share data. The Data Conversations at the VU Amsterdam share the same aim and are intended to provide a forum for researchers from different subjects and disciplines to exchange practices and ideas around open data, FAIR data, research data management and related open science topics.
Estimation of Measurement Uncertainty of kinematic TLS Observation Process by means of Monte-Carlo Methods
Creators: name: Alkhatib, Hamza
name: Kutterer, Hansjörg
Publisher: name: Berlin : Walter de Gruyter
Year: 2013
Subjects: subject: Monte Carlo simulation
subject: kinematic terrestrial laserscanning
subject: uncertainty modeling
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: In many cases, the uncertainty of output quantities may be computed by assuming that the distribution represented by the result of measurement and its associated standard uncertainty is a Gaussian. This assumption may be unjustified and the uncertainty of the output quantities determined in this way may be incorrect. One tool to deal with different distribution functions of the input parameters and the resulting mixed-distribution of the output quantities is given through the Monte Carlo techniques. The resulting empirical distribution can be used to approximate the theoretical distribution of the output quantities. All required moments of different orders can then be numerically determined. To evaluate the procedure of derivation and evaluation of output parameter uncertainties outlined in this paper, a case study of kinematic terrestrial laserscanning (k-TLS) will be discussed. This study deals with two main topics: the refined simulation of different configurations by taking different input parameters with diverse probability functions for the uncertainty model into account, and the statistical analysis of the real data in order to improve the physical observation models in case of k-TLS. The solution of both problems is essential for the highly sensitive and physically meaningful application of k-TLS techniques for monitoring of, e. g., large structures such as bridges.
Another analytic view about quantifying social forces
Creators: name: Ausloos, Marcel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Montroll had considered a Verhulst evolution approach for introducing a notion he called "social force", to describe a jump in some economic output when a new technology or product outcompetes a previous one. In fact, Montroll's adaptation of Verhulst equation is more like an economic field description than a "social force". The empirical Verhulst logistic function and the Gompertz double exponential law are used here in order to present an alternative view, within a similar mechanistic physics framework. As an example, a "social force" modifying the rate in the number of temples constructed by a religious movement, the Antoinist community, between 1910 and 1940 in Belgium is found and quantified. Practically, two temple inauguration regimes are seen to exist over different time spans, separated by a gap attributed to a specific "constraint", a taxation system, but allowing for a different, smooth, evolution rather than a jump. The impulse force duration is also emphasized as being better taken into account within the Gompertz framework. Moreover, a "social force" can be as here, attributed to a change in the limited need/capacity of some population, coupled to some external field, in either Verhulst or Gompertz equation, rather than resulting from already existing but competing goods as imagined by Montroll.
description: 4 figures, 29 refs., 15 pages; prepared for Advances in Complex Systems
VU Data Conversations: Hackathons, Collaboration and Data in (Open) Science
Creators: name: Reuver, Myrthe
name: Heunis, Stephan
name: Rodenburg, Elisa
Publisher: name: Zenodo
Year: 2021
Subjects: Data Conversations
Open Science
Collaboration
Hackathons

description: Presentations given at the Data Conversations held at the Vrije Universiteit Amsterdam and organised by the VU University Library on 7 April 2021. The theme of this edition was "Hackathons, Collaboration and Data in (Open) Science". Agenda: Myrthe Reuver, "Hackathons, Shared Tasks, and Papers: Collaboration and Interdisciplinarity with Data on Complex Problems" Stephan Heunis, "Collaborative and community-driven research projects and articles" About Data Conversations Data Conversations started at the University of Lancaster in the UK. The Lancaster Data Conversations aim to bring data practitioners together to talk about how researchers create, collect, use and share data. The Data Conversations at the VU Amsterdam share the same aim and are intended to provide a forum for researchers from different subjects and disciplines to exchange practices and ideas around open data, FAIR data, research data management and related open science topics.
title: Antropologia dell’immaginario nazionale e ‘processi di dis-identità’ nel cinema di Luchino Visconti
Creators: name: Biondi  , Teresa
Publisher: name: RomaTrE-Press
Year: 2019

description: Nel cinema di Visconti l’italianità è rappresentata nella sua ‘disfatta antropomorfica’ o nella perdita dei tratti umani dei personaggi, ed è mostrata come condizione ontologica del multi-sfaccettato immaginario nazionale che si presenta nel suo ‘tessuto’ culturale ibrido e in gran parte utopico poiché mai integralmente affermato come insieme di caratteristiche originarie riconoscibili in modo univoco nel paradigma della tradizione e dell’identità italiana. A partire dal 1960 le radicali trasformazioni storico-antropologiche che riguardano le nuove politiche europee si inseriscono come nuovi elementi dis-identitari nel quadro culturale già in sfacelo, una condizione che non sfugge a Visconti.
description: Cinema e identità italiana
On the detection of systematic errors in terrestrial laser scanning data
Creators: name: Wang, Jin
name: Kutterer, Hansjörg
name: Fang, Xing
Publisher: name: Berlin : Walter de Gruyter
Year: 2012
Subjects: subject: Terrestrial laser scanning
subject: systematic errors
subject: iterative closest point
subject: structural monitoring
subject: quadratic form estimation
subject: Gauss–Helmert model
subject: Dewey Decimal Classification::500 | Naturwissenschaften::520 | Astronomie, Kartographie

description: Quality descriptions are parts of the key tasks of geodetic data processing. Systematic errors should be detected and avoided in order to insure the high quality standards required by structural monitoring. In this study, the iterative closest point (ICP) method was invested to detect systematic errors in two overlapping data sets. There are three steps to process the systematic errors: firstly, one of the data sets was transformed to a reference system by the introduction of the Gauss–Helmert (GH) model. Secondly, quadratic form estimation and segmentation methods are proposed to guarantee the overlapping data sets. Thirdly, the ICP method was employed for a finer registration and detecting the systematic errors. A case study was casted in which a dam surface in Germany was scanned by terrestrial laser scanning (TLS) technology. The results indicated that with the conjugation of ICP algorithm the accuracy of the data sets was improved approximately by 1.6 mm.
Accelerating dark energy models with anisotropic fluid in Bianchi type-$VI_{0}$ space-time
Creators: name: Pradhan, Anirudh
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Motivated by the increasing evidence for the need of a geometry that resembles Bianchi morphology to explain the observed anisotropy in the WMAP data, we have discussed some features of the Bianchi type-$VI_{0}$ universes in the presence of a fluid that wields an anisotropic equation of state (EoS) parameter in general relativity. We present two accelerating dark energy (DE) models with an anisotropic fluid in Bianchi type-$VI_{0}$ space-time. To prevail the deterministic solution we choose the scale factor $a(t) = \sqrt{t^{n}e^{t}}$, which yields a time-dependent deceleration parameter (DP), representing a class of models which generate a transition of the universe from the early decelerating phase to the recent accelerating phase. Under the suitable condition, the anisotropic models approach to isotropic scenario. The EoS for dark energy $ω$ is found to be time-dependent and its existing range for derived models is in good agreement with the recent observations of SNe Ia data (Knop et al. 2003), SNe Ia data with CMBR anisotropy and galaxy clustering statistics (Tegmark et al. 2004) and latest combination of cosmological datasets coming from CMB anisotropies, luminosity distances of high redshift type Ia supernovae and galaxy clustering (Hinshaw et al. 2009; Komatsu et al. 2009). For different values of $n$, we can generate a class of physically viable DE models.The cosmological constant $Λ$ is found to be a positive decreasing function of time and it approaches to a small positive value at late time (i.e. the present epoch) which is corroborated by results from recent type Ia supernovae observations. We also observe that our solutions are stable. The physical and geometric aspects of both the models are also discussed in detail.
description: 22 pages, 8 figures. arXiv admin note: substantial text overlap with arXiv:1010.1121, arXiv:1108.2133, arXiv:1010.2362
Cell broadening revisited: Results from high-resolution large-eddy simulations of cold air outbreaks
Creators: name: Schröter, M.
name: Raasch, S.
name: Jansen, H.
Publisher: name: Boston, Massachusetts : American Meteorological Society
Year: 2005
Subjects: subject: Large-eddy simulations (LES)
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::551 | Geologie, Hydrologie, Meteorologie

description: Large-eddy simulations (LES) have been carried out in order to investigate the structure and development of organized mesoscale cellular convection (MCC) during cold air outbreaks (CAOB) and to reevaluate results by Müller and Chlond. Some limitations of this and other earlier LES studies of CAOBs have been removed by using a parallelized model with both a large horizontal domain and a fine grid resolution. These model simulations reveal a hitherto undiscovered insight into the development of MCC. It is shown that MCC with aspect ratios larger than 10 only develop in the presence of diabatic heat sources, that is, latent heat release within the clouds and cloud-top radiative cooling, which confirms results from previous studies. Simulated cells are of closed type. The wind field is seen to be correlated with the liquid water field, and thus, dynamic variables are organized on the mesoscale as well. Updrafts predominantly occur in regions with high liquid water content. Two-dimensional spectral analysis confirms clear peaks at the wavelength of the MCC. The dynamic variables are characterized by an organized conglomeration of randomly distributed up- and downdrafts, where each convective cell can hardly be detected by eye. Whereas scalar variables like temperature and the liquid water path field are characterized by large scales with aspect ratios of 9 to 11, in the vertical velocity field multiple scales are present simultaneously, with small scales having aspect ratios between 1 and 3 contributing most to the total energy, but also large scales correlated with scales seen in the thermodynamic variables. Copyright 2005 American Meteorological Society
From Ideal Reactor Concepts to Reality: The Novel Drum Reactor for Photocatalytic Wastewater Treatment
Creators: name: Adams, Morgan
name: Campbell, Ian
name: McCullagh, Cathy
name: Russell, Donnacha
name: Bahnemann, Detlef W.
name: Robertson, Peter K.J.
Publisher: name: Berlin : Walter de Gruyter
Year: 2013
Subjects: subject: drum photoreactor photocatalysis
subject: mass transport
subject: titanium dioxide (tio2)
subject: produced water
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: This article reports the development of a novel drum photocatalytic reactor for treating dye effluent streams. The parameters for operation including drum rotation speed, light source distance, catalyst loading and H2O2 doping have been investigated using methylene blue as a model pollutant. Effluent can be generated by a number of domestic and industrial sources, including pharmaceutical, oil and gas, agricultural, food and chemical sectors. The work reported here proposes the application of semiconductor photocatalysis as a final polishing step for the removal of hydrocarbons from effluents sources, initial studies have proved effective in removing residual hydrocarbons from the effluent.
Maximum synchrotron frequency for shock-accelerated particles
Creators: name: Kumar, P.
name: Hernández, R. A.
name: Bosnjak, Z.
name: Duran, R. Barniol
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: It is widely believed that the maximum energy of synchrotron photons when electrons are accelerated in shocks via the Fermi process is about 50 MeV (in plasma comoving frame). We show that under certain conditions, which are expected to be realized in relativistic shocks of gamma-ray bursts, synchrotron photons of energy much larger than 50 MeV (comoving frame) can be produced. The requirement is that magnetic field should decay downstream of the shock front on a length scale that is small compared with the distance traveled by the highest energy electrons before they lose half their energy; photons of energy much larger than 50 MeV are produced close to the shock front whereas the highest Lorentz factor that electrons can attain is controlled by the much weaker field that occupies most of the volume of the shocked plasma.
description: 5 pages, 1 figure; MNRAS in press
Dieter Kremer (Hrsg.), Dictionnaire historique des noms de famille romans. Actes du 1er colloque (Trèves 10–13 décembre 1987), 1990 / Antoni M. Badia I Margarit (Hrsg.), Dictionnaire historique des noms de famille romans. Actes del III Colloqui (Barcelona 19–21 juny 1989), 1991 / Gérard Taverdet (Hrsg.), Dictionnaire historique des noms de famille romans. Actes du colloque IV (Dijon, 24–26 septembre 1990), 1992
Creators: name: Bourin, Monique
Publisher: name: Francia
Year: 2019

description: -
description: Francia, Bd. 20, Nr. 1 (1993)
Preparation and Analysis of PCL Spun Chitosan Scaffolds as Guidance Channels for Peripheral Nerve Regeneration
Creators: name: Behrens, Peter
name: Glasmacher, Birgit
name: Duda, Sven
name: Haastert-Talini, Kirsten
Publisher: name: Berlin : Walter de Gruyter
Year: 2013
Subjects: subject: nerve guidance channel
subject: oriented solidification
subject: lyophilisation
subject: chitosan
subject: electrospinning of PCL
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: The results of this work show that the process of oriented solidification and lyophilisation is able to produce porous chitosan scaffolds with appropriate porosity and pore size for nerve regeneration. Interesting in this context are the results of statistical analysis of image analysis from SEM micrographs of uncrosslinked and UV cross-linked samples. The average pore size and mean minimum pore diameter show only small differences if the cooling rate is varied from B = 1…5 K / min and the temperature gradient from G = 1, 1.5, 2.0 K / mm. The average pore size (cross sectional area) of these samples can be estimated with reasonable accuracy, with 2100 μm². The average minimum pore diameter is within the range of 36-38 μm. These values are in a favourable range for the cell growth of nerve regeneration.