cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ultrarelativistic black hole formation
Creators: name: East, William E.
name: Pretorius, Frans
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the ultrarelativistic head-on collision of equal mass particles, modeled as self-gravitating fluid spheres, by numerically solving the coupled Einstein-hydrodynamic equations. We focus on cases well within the kinetic energy dominated regime, where between 88-92% ($γ=8$ to 12) of the initial net energy of the spacetime resides in the translation kinetic energy of the particles. We find that for sufficiently large boosts, black hole formation occurs. Moreover, near yet above the threshold of black hole formation, the collision initially leads to the formation of two distinct apparent horizons that subsequently merge. We argue that this can be understood in terms of a focusing effect, where one boosted particle acts as a gravitational lens on the other and vice versa, and that this is further responsible for the threshold being lower (by a factor of a few) compared to simple hoop conjecture estimates. Cases slightly below threshold result in complete disruption of the model particles. The gravitational radiation emitted when black holes form reaches luminosities of 0.014 $c^5/G$, carrying $16\pm2%$ of the total energy.
description: 5 pages, 4 figures; revised to match PRL version
S. Doering-Manteuffel, J. Mančal, W. Wüst (Hg.), Pressewesen der Aufklärung: periodische Schriften im Alten Reich, 2001
Creators: name: Losfeld, Christophe
Publisher: name: Francia
Year: 2019

description: S. Doering-Manteuffel, J. Mančal, W. Wüst (Hg.), Pressewesen der Aufklärung: periodische Schriften im Alten Reich, 2001 (C. Losfeld)
description: Francia, Bd. 30 Nr. 2 (2003)
Die Landauer Jakobinerprotokolle 1791-1794, bearb. von A. Imhoff und M. Martin, 2001
Creators: name: Gilli, Marita
Publisher: name: Francia
Year: 2019

description: Die Landauer Jakobinerprotokolle 1791-1794, bearb. von A. Imhoff und M. Martin, 2001 (M. Gilli)
description: Francia, Bd. 30 Nr. 2 (2003)
R. Blänkner, G. Göhler, N. Waszek (Hg.), Eduard Gans (1797–1839). Politischer Professor zwischen Restauration und Vormärz, 2002
Creators: name: Trautmann-Waller, Céline
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 31 Nr. 3 (2004)
Height correlation of rippled graphene and Lundeberg-Folk formula for magnetoresistance
Creators: name: Genma, Kazuyuki
name: Katori, Makoto
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Application of an in-plane magnetic field to rippled graphene will make the system be a plane with randomly distributed vector potentials. Massless Dirac fermions carrying charges on graphene are scattered by the vector potentials and magnetoresistance is induced proportional to the square of amplitude of in-plane magnetic field $B_{\parallel}^2$. Recently, Lundeberg and Folk proposed a formula showing dependence of the magnetoresistance on carrier density, in which the coefficient of $B_{\parallel}^2$ is given by a functional of the height-correlation function $c(r)$ of ripples. In the present paper, we give exact and explicit expressions of the coefficient for the two cases such that $c(r)$ is (i) exponential and (ii) Gaussian. The results are given using well-known special functions. Numerical fitting of our solutions to experimental data were performed. It is shown that the experimental data are well-described by the formula for the Gaussian height-correlation of ripples in the whole region of carrier density. The standard deviation $Z$ of ripple height and the correlation length $R$ of ripples are evaluated, which can be compared with direct experimental measurements.
description: v2: LaTeX2e, 21 pages, 3 figures, minor corrections made for publication in J. Inst. Sci. Eng. Chuo Univ
Messenger RNA Delivery with Lipid Nanoparticles to Non-Liver Targets
Creators: name: Strelkova, Daria
Publisher: name: Carnegie Mellon University
Year: 2023
Subjects: Biological Engineering

description: Lipid nanoparticle vehicles are effective tools for delivering messenger RNA therapeutics. They have been successfully used in Moderna and Pfizer vaccines against COVID-19 and are in end stage clinical trials for several metabolic liver diseases. Despite their success, we do not have a complete understanding of how different lipid components affect particle tropism and efficacy in vivo. Currently, lipid nanoparticles are only efficient at targeting the liver, when administered systemically. This confines mRNA therapies to liver related diseases while the potential for messenger RNA application is much greater. Out of the four lipid components of the particle, chemistry of the ionizable lipid has the most influence on the lipid nanoparticle by impacting the particle’s protein corona and its endosomal escape facilitation. Understanding the exact structure function relationships between ionizable lipid chemistry and a nanoparticle’s behavior in vivo is crucial for rational and systematic design of lipids that are safe, efficient and endogenously target cells of interest.
 Here, I focus on finding new materials capable of endogenous lung and hematopoetic stem cell delivery. I screened our 580 novel ionizable lipid library in mice to find materials and formulations capable of reaching non-liver targets. During my screen in mice, I found several new components capable of endogenous targeting of spleen and lungs, along with one lipid nanoparticle capable of transfecting natural killer, dendritic, epithelial, and endothelial cells in lungs in vivo. These cells are clinically relevant in treatment of various lung diseases, like cystic fibrosis or lung cancers. I also screened this library in ex vivo human hematopoetic stem cells in search of hematopetic stem cell transfecting materials. While I did see several potent materials, I found a significant variability in their efficacy between cell donors. During this work I also found that making lipid nanoparticles with microfluidic mixing can skew their organ tropism, and that our lipid nanoparticles can successfully deliver long messenger RNAs such as the CRISPRi system. I showed that this gene modulation tool has different protein silencing kinetics than what we see with siRNA. Together these findings advance the lipid nanoparticle capabilities to deliver mRNA therapeutics beyond the liver.
Background subtraction and jet quenching on jet reconstruction
Creators: name: Apolinário, Liliana
name: Armesto, Néstor
name: Cunqueiro, Letícia
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In order to assess the ability of jet observables to constrain the characteristics of the medium produced in heavy-ion collisions at the LHC, we investigate the influence of background subtraction and jet quenching on jet reconstruction, with focus on the dijet asymmetry as currently studied by ATLAS and CMS. Using a toy model, we examine the influence of different background subtraction methods on dijet momentum imbalance and azimuthal distributions. We compare the usual jet-area based background subtraction technique and a variant of the noise-pedestal subtraction method used by CMS. The purpose of this work is to understand what are the differences between the two techniques, given the same event configuration. We analyze the influence of the quenching effect using the Q-PYTHIA Monte Carlo on the previous observables and to what extent Q-PYTHIA is able to reproduce the CMS data for the average missing transverse momentum that seems to indicate the presence of large angle emission of soft particles.
description: 4 pages, 3 figures, Proceedings for Hard Probes 2012
M. Herren, S. Zala, Netzwerk Außenpolitik. Internationale Kongresse und Organisationen als Instrumente der schweizerischen Außenpolitik 1914–1950, 2002
Creators: name: Schiffers, Reinhard
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 31 Nr. 3 (2004)
E. Oberländer (Hg.) in Zusammenarbeit mit R. Ahmann, H. Lemberg, H. Sundhaussen, Autoritäre Regime in Ostmittel- und Südosteuropa 1919–1944, 2001
Creators: name: Hogenhuis-Seliverstoff, Anne
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 31 Nr. 3 (2004)
J. Altwegg, Geisterzug in den Tod. Ein unbekanntes Kapitel der deutsch-französischen Geschichte 1944, 2001 – Idem, L'Odyssée du train fantôme, 3 juillet 1944. Une page de notre histoire, 2003
Creators: name: Polino, Marie-Noëlle
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 31 Nr. 3 (2004)
The Weyl-Wigner-Moyal Formalism for Spin
Creators: name: Li, Feifei
name: Braun, Carol
name: Garg, Anupam
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Weyl-Wigner-Moyal formalism is developed for spin by means of a correspondence between spherical harmonics and spherical harmonic tensor operators. The analogue of the Moyal expansion is developed for the Weyl symbol of the product of two operators in terms of the symbols for the individual operators, and it is shown that in the classical limit, the Weyl symbol for a commutator equals $i$ times the Poisson bracket of the corresponding Weyl symbols. It is also found that, to the same order, there is no correction in the symbol for the anticommutator.
J. Zarusky (Hg.), Die Stalin-Note vom 10. März 1952. Neue Quellen und Analysen, mit Beiträgen von W. Loth, H. Graml und G. Wettig, 2002
Creators: name: Dülffer, Jost
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 31 Nr. 3 (2004)
A new tuning fork-based instrument for oscillatory shear rheology of nano-confined liquids
Creators: name: Kapoor, Karan
name: Kanawade, Vinod
name: Shukla, Vibham
name: Patil, Shivprasad
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present a new method to measure rheological response of liquids confined to nano-scale which exhibit a considerable slow-down in dynamics compared to bulk liquids. The method relies on using a robust force sensor that has a sensitivity to measure shear forces in the range of 1 to 10 nN and a stiffness of 55000 N/m to avoid thermal noise. Off-resonance operation ensures application of a range of shear frequencies . This range is higher than the inverse of the system's mechanical relaxation time and allows the measurement of non-linear effects emerging due to significant "slow down" in dynamics upon confinement. The instrument is a step forward towards resolving the controversies about the nature of nano-confined liquids.
description: This paper is withdrawn due to incompelete interpretation related issues
Bilingual_Eng_BP_LexicalCorpus
Creators: name: Jan-Willem Van Leussen
name: Da Silveira, Amanda Post
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: type
subject: non-native
subject: cognates
subject: lexical frequency
subject: perception
subject: Brazilian Portuguese
subject: English
subject: normalized Levenstein distances
subject: phonetics
subject: corpus
subject: psycholinguistics
subject: token

description: Corpus composed by translation pairs of cognate and non cognate words from English and Brazilian Portuguese. The cognate status of the words wasdefined by a measure called Interlanguage normalized Levenshtein distances.
Eternal Black Holes and Superselection in AdS/CFT
Creators: name: Marolf, Donald
name: Wall, Aron C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It has been argued i) that Lorentz-signature solutions with wormholes connecting n asymptotically AdS regions describe bulk quantum states dual to n entangled but non-interacting CFTs and ii) that such bulk wormhole states should be identified with similar entangled but non-interacting bulk systems, each describing quantum geometries with only a single asymptotic region. But if the wormhole is to behave semiclassically, we show that conjecture (ii) cannot hold. Instead, the theory of asymptotically AdS bulk quantum gravity must admit superselection sectors with respect to the CFT observables that are labeled by the type of wormhole connections allowed between black holes. Moreover, these superselection sectors are indistinguishable in the dual CFT. Finally, we describe restrictions on the possible superselection sectors associated with the spin-statistics relation and the expectation that black holes lying in distinct asymptotically AdS regions may be approximated by well-separated black holes in a single asymptotically AdS region.
description: 16 pages, 1 figure, v2 references and minor comments added, v3 includes "Note added in Proof"
An approach to generating customized load-store architectures
Creators: name: Xu, Guanglin
Publisher: name: Carnegie Mellon University
Year: 2023
Subjects: Computer Engineering

description: Automated design generation is increasingly used in hardware accelerators to effectively handle the large trade-off space between performance and resource utilization. Typically, a generator focuses on a specialized parallel architecture that fits a particular set of algorithms. As a result, it is difficult to extend the algorithmic support of generators. In contrast, a processor-like architecture, where the datapath is connected to memory ports with all computations sequenced by a controller, can provide much better flexibility. In this dissertation, I call such an architecture the ``load-store architecture'' and present an approach to hardware design generation from high-level specifications. The approach generates customized load-store architecture designs across multiple abstraction levels for algorithm generation, loop optimization, and hardware interpretation, respectively.
 The proposed approach is inspired by the Spiral code generation framework and is realized by extending Spiral. In generating algorithms for customized load-store architectures at the data flow level, I present the importance of providing sufficient independent iterations to accommodate the long latency of customized pipelines. The generated algorithms are then translated to loop programs captured in an extensible domain-specific language (DSL) for hardware-oriented loop optimizations. I identified a computational pattern of imperfect loop nests and provide optimizations for reducing execution cycle counts and decreasing memory buffer utilization as well as arithmetic counts in address calculation. Finally, the optimized loops are interpreted to register-transfer level designs in another hardware-extended DSL where local optimizations are employed.
 I implemented the approach by extending the open-source Spiral system. I demonstrated the flexibility of the system by generating designs for signal transforms including Walsh-Hadamard transforms and discrete Fourier transforms, and data sorting. Experimental results support the benefit of hardware-oriented optimizations. In particular, the FFT IP cores generated with my approach are comparable to state-of-the-art designs. Despite further parallelization and hardware compilation efforts to be pursued, this dissertation has paved the way for generating competitive hardware designs with Spiral in a flexible manner.
Rotating quantum turbulence in superfluid 4He in the T=0 limit
Creators: name: Walmsley, P. M.
name: Golov, A. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Observations of quantum turbulence in pure superfluid 4He in a rotating container are reported. New techniques of large-scale forcing (rotational oscillations of the cubic container) and detecting (monitoring ion transport along the axis of rotation) turbulence were implemented. Near the axial walls, with increasing forcing the vortex tangle grows without an observable threshold. This tangle gradually develops into bulk turbulence at a characteristic amplitude of forcing that depends on forcing frequency and rotation rate. At higher amplitudes, the total vortex line length increases rapidly. Resonances of inertial waves are observed in both laminar and turbulent bulk states. On such resonances, the turbulence appears at smaller amplitudes of forcing.
description: 5 pages, 5 figures
Our Vulnerable Dark Side—Two Laboratory Approaches
Creators: name: Laemmle, Lena
name: Ziegler, Matthias
Publisher: name: Humboldt-Universität zu Berlin
Year: 2021
Subjects: subject: Dark Triad
subject: deliberate self-harm
subject: vulnerability
subject: white noise
subject: electric shocks
subject: 150 Psychologie

description: The Dark Triad of personality has been associated with aggression against others as a reaction to perceived provocations. However, previous work has also shown that such responsive aggression even occurs if it means harming oneself. The first of two laboratory studies aimed to investigate whether this relation between the Dark Triad and self-harming behavior also occurs in situations where no others are affected but self-harm is likely. The second laboratory study considered two different settings in a within-participants design in order to analyze the stability of self-harming behavior and to what extent the Dark Triad constructs influence this behavior. The sample for study 1 consisted of 151 students (45.7% female) with a mean age of 21.40 years (SD = 2.19); the sample for study 2 consisted of 251 students (76.0% female) with a mean age of 22.21 years (SD = 3.90). Aside from the Dark Triad’s common core, depending on how self-harm was triggered (ego-threat (mainly narcissism), being alone with one’s own thoughts (mainly psychopathy), or reward condition (mainly Machiavellianism)), the Dark Triad traits differed in their responsiveness but were stable over the last two conditions, thereby suggesting a vulnerable side of the Dark Triad.
Can Standard Model Higgs Seed the Formation of Structures in Our Universe?
Creators: name: Choi, Ki-Young
name: Huang, Qing-Guo
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the Standard Model Higgs field as a source for the primordial curvature perturbation, particularly in the curvaton and modulated reheating scenario. We conclude that the Higgs cannot play as a curvaton due to the small energy density when it decays, however the modulated reheating by Higgs can be a viable scenario. In the latter case, the non-Gaussianity is inevitably generated and strongly constrains the type of potential of inflaton field and Higgs-dependent interaction term. For the quadratic potential of the inflaton field with decay rate which non-linearly depends on the Higgs vacuum expectation value, the contribution of Higgs field to the primordial curvature perturbation must be less than 8%.
description: 12 pages; version accepted for publication in Phys.Rev.D
New velocity-space discretization for continuum kinetic calculations and Fokker-Planck collisions
Creators: name: Landreman, Matt
name: Ernst, Darin R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences
subject: 65Z05

description: Numerical techniques for discretization of velocity space in continuum kinetic calculations are described. An efficient spectral collocation method is developed for the speed coordinate - the radius in velocity space - employing a novel set of non-classical orthogonal polynomials. For problems in which Fokker-Planck collisions are included, a common situation in plasma physics, a procedure is detailed to accurately and efficiently treat the field term in the collision operator (in the absence of gyrokinetic corrections). When species with disparate masses are included simultaneously, a careful extrapolation of the Rosenbluth potentials is performed. The techniques are demonstrated in neoclassical calculations of the bootstrap current and plasma flows in a tokamak.
Characterising galaxy groups: spectroscopic observations of the Shakhbazyan sample
Creators: name: Capozzi, Diego
name: Spavone, Marilena
name: Barbati, Silvio
name: Paolillo, Maurizio
name: De Filippis, Elisabetta
name: Longo, Giuseppe
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Groups of galaxies are the most common cosmic structures. However, due to the poor statistics, projection effects and the lack of accurate distances, our understanding of their dynamical and evolutionary status is still limited. This is particularly true for the so called Shakhbazyan groups (SHK) which are still largely unexplored due to the lack of systematic spectroscopic studies of both their member galaxies and the surrounding environment. In our previous paper, we investigated the statistical properties of a large sample of SHK groups using Sloan Digital Sky Survey data and photometric redshifts. Here we present the follow-up of 5 SHK groups (SHK 10, 71, 75, 80, 259) observed within our spectroscopic campaign with the Telescopio Nazionale Galileo, aimed at confirming their physical reality and strengthening our photometric results. For each of the selected groups we were able to identify between 6 and 13 spectroscopic members, thus confirming the robustness of the photometric redshift approach in identifying real galaxy over-densities. Consistently with the finding of our previous paper, the structures studied here have properties spanning from those of compact and isolated groups to those of loose groups. For what the global physical properties are concerned (total mass, mass-to-light ratios, etc.), we find systematic differences with those reported in the literature by previous studies. Our analysis suggests that previous results should be revisited; we show in fact that, if the literature data are re-analysed in a consistent and homogeneous way, the properties obtained are in agreement with those estimated for our sample.
description: 31 pages, 25 figures, 10 tables. Accepted for publication on MNRAS. Table references updated. Few minor corrections to the text applied
Neuerwerbungen des Bayerischen Nationalmuseums in München
Creators: name: Müller, Theodor
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Vol 3 No 1 (1950): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Production of K$^{*}$(892)$^{0}$ and $ϕ$(1020) in pp collisions at $\sqrt{s}=7$ TeV
Creators: name: ALICE Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The production of K$^{*}$(892)$^{0}$ and $ϕ$(1020) in pp collisions at $\sqrt{s}=7$ TeV was measured by the ALICE experiment at the LHC. The yields and the transverse momentum spectra d$^{2}$N/d$y$d$p_{\rm T}$ at midrapidity $|y|<0.5$ in the range $0
description: 28 pages, 12 captioned figures, 3 tables, authors from page 23, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3101
Quantum thermalization and equilibrium state with multiple temperatures
Creators: name: Zhuang, Quntao
name: Wu, Biao
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A large class of isolated quantum system in a pure state can equilibrate and serve as a heat bath. We show that once the equilibrium is reached, any of its subsystems that is much smaller than the isolated system is thermalized such that the subsystem is governed by the Gibbs distribution. Within this theoretical framework, the celebrated superposition principle of quantum mechanics leads to a prediction of a thermalized subsystem with multiple temperatures when the isolated system is in a superposition state of energy eigenstates of multiple distinct energy scales. This multiple-temperature state is at equilibrium, completely different from a non-equilibrium state that has multiple temperatures at different parts. Feasible experimental schemes to verify this prediction are discussed.
description: 6 pages, 2 figures
On the homomorphisms between the generalized Verma modules arising from conformally invariant systems
Creators: name: Kubo, Toshihisa
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 22E47 (Primary) 17B10 (Secondary)

description: It is shown by Barchini, Kable, and Zierau that conformally invariant systems of differential operators yield explicit homomorphisms between certain generalized Verma modules. In this paper we determine whether or not the homomorphisms arising from such systems of first and second order differential operators associated to maximal parabolic subalgebras of quasi-Heisenberg type are standard.
Quantum statistical imaging of particles without restriction of the diffraction limit
Creators: name: Cui, Jin-Ming
name: Sun, Fang-Wen
name: Chen, Xiang-Dong
name: Gong, Zhao-Jun
name: Guo, Guang-Can
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A practical quantum measurement method based on the quantum nature of anti-bunching photon emission has been developed to detect single particles without the restriction of the diffraction limit. By simultane- ously counting the single-photon and two-photon signals with fluorescence microscopy, the images of nearby Nitrogen-Vacancy centers in diamond at a distance of 8.5+/-2.4 nm have been successfully reconstructed. Also their axes information was optically obtained. This quantum statistical imaging technique, with a simple exper- imental setup, can also be easily generalized in the measuring and distinguishing of other physical properties with any overlapping, which shows high potential in future image and study of coupled quantum systems for quantum information techniques.
description: 5 figures
Feustel, Rudolf: Bronzezeitliche Hügelgräberkultur im Gebiet von Schwarza (Südthüringen)
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Feustel, Rudolf: Bronzezeitliche Hügelgräberkultur im Gebiet von Schwarza (Südthüringen). Bd. 1 der Veröffentlichungen des Museums für Ur- und Frühgeschichte Thüringens, herausgegeben von G. Behm-Blancke. Weimar (Hermann Böhlhaus Nachf.) 1958. 104 Seiten mit 5 Abb. im Text und 57 Taf. Halbl.
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 28 (1959): Nachrichten aus Niedersachsens Urgeschichte
title: Η εταιρική κοινωνική ευθύνη ως μέσο προώθησης στα ιδιωτικά εκπαιδευτήρια
title: Corporate social responsibility as a means of promotion in private education schools
titleType: AlternativeTitle
Creators: name: Γαβότση, Θεοδώρα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Εταιρική κοινωνική ευθύνη
subject: Ιδιωτικά εκπαιδευτήρια
subject: Προώθηση

description: Η Εταιρική Κοινωνική Ευθύνη αποτελεί πλέον ένα απαραίτητο εργαλείο για επιχειρήσεις και εταιρείες έτσι ώστε να καταδείξουν ότι δεν τους ενδιαφέρει μόνο το κέρδος και οι θετικές οικονομικές καταστάσεις αλλά και ο κοινωνικός και περιβαλλοντικός αντίκτυπος που έχουν οι δράσεις τους προς την κοινωνία. Ο βασικός σκοπός της εργασίας είναι να προσδιορίσει αρχικά την έννοια της ΕΚΕ και πως αυτή εφαρμόζεται τόσο διεθνώς όσο και στην Ελλάδα καθώς επίσης την έννοια της ιδιωτικής εκπαίδευσης αλλά και πως συνεργάζονται οι εταιρείες με ιδιωτικά σχολεία έτσι ώστε να προωθήσουν την Εταιρική Κοινωνική Ευθύνη. Αναλύεται η κατάσταση τόσο σε παγκόσμιο, ευρωπαϊκό αλλά και στην Ελλάδα καθώς και η επιρροή των οικονομικών, περιβαλλοντικών κρίσεων και της πανδημίας COVID-19 ως παράγοντες προώθησης της ΕΚΕ για τα θέματα αυτά. Για να μελετηθεί αυτό λαμβάνουμε ως βάση τη βιβλιογραφία και απαντήσεις από 6 διαφορετικούς εργαζομένους σε ιδιωτικά σχολεία της Αθήνας μέσω συνεντεύξεων. Τα αποτελέσματα δείχνουν ότι υπάρχει πραγματική διασύνδεση μεταξύ των δύο εννοιών καθώς και πολλά παραδείγματα καλών πρακτικών που δείχνει ότι μελλοντικά οι δεσμοί μεταξύ ΕΚΕ και ιδιωτικής Εκπαίδευσης θα γίνουν ακόμα πιο στενοί καθώς και ότι η ευαισθητοποίηση των επιχειρήσεων και εταιρειών σε κοινωνικά, περιβαλλοντικά θέματα και περιόδους κρίσεων επιβάλλεται.
Brandt, Johanna: Das Urnengräberfeld von Preetz in Holstein
Creators: name: Genrich, Albert
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Brandt, Johanna: Das Urnengräberfeld von Preetz in Holstein, mit einem Anhang von Ulrich Schäfer: Anthropologische Untersungen einiger Leichenbrände des Gräberfeldes. Neumünster 1960. Verlag Karl Wachholtz. 8 Textabbildungen, 37 Tafeln, 29 Pläne und Karten
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 30 (1961): Nachrichten aus Niedersachsens Urgeschichte
title: Τα οφέλη της δια βίου μάθησης στην τεχνολογία των οπτικών ινών με διεθνή πιστοποίηση
title: The benefits of lifelong learning in fiber optic technology with international certification
titleType: AlternativeTitle
Creators: name: Γκούμας, Παναγιώτης
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: CFOT
subject: FOA
subject: Οπτικές ίνες
subject: Δια βίου μάθηση
subject: Fiber optics
subject: Lifelong learning
subject: Certified Fiber Optic Technician

description: Σκοπός: Σκοπός είναι να μελετηθεί ο βαθμός στον οποίο οι εκπαιδευόμενοι ωφελούνται από το πρόγραμμα κατάρτισης των οπτικών ινών CFOT. Πιο συγκεκριμένα εξετάζεται ο βαθμός στον οποίο ωφελούνται και ο τρόπος με τον οποίο γίνεται αυτό. Δείγμα: Στην έρευνα συμμετείχαν 101 άτομα που είχαν παρακολουθήσει με επιτυχία το συγκεκριμένο πρόγραμμα. Η πλειοψηφία του δείγματος ήταν απόφοιτοι της τριτοβάθμιας εκπαίδευσης, 31-40 ετών, έγγαμοι, που δραστηριοποιούνταν επαγγελματικά στην Αθήνα και ήταν ιδιωτικοί υπάλληλοι. Ερευνητικό εργαλείο: Το ερωτηματολόγιο ήταν το ερευνητικό εργαλείο, που σχεδιάστηκε για τους σκοπούς της παρούσας εργασίας. Αποτελείται από 22 ερωτήσεις κλειστού τύπου, εκ των οποίων οι 11 μελετούν τα κοινωνικοδημογραφικά χαρακτηριστικά του δείγματος και οι υπόλοιπες ερευνούν στοιχεία των συμμετεχόντων, μετά από το πρόγραμμα οπτικών ινών, που παρακολούθησαν. Αποτελέσματα: Το 76,86% των συμμετεχόντων δήλωσαν ότι συνέχισαν να απασχολούνται στην επαγγελματική δραστηριότητα που είχαν ως εκείνη τη στιγμή. Το 58,68% των συμμετεχόντων μετά την εκπαίδευση τους ανέλαβαν εργασίες πάνω στις οπτικές ίνες. Το 65,29% δεν άλλαξε εργοδότη μετά το σεμινάριο. Το 33,88% κράτησε ουδέτερη στάση όσον αφορά το αν ήθελαν να αλλάξουν εργοδότη στο μέλλον. Το 34,71% των συμμετεχόντων δήλωσε πως δεν τους προσέγγισαν άλλοι εργοδότες. Το 65,29% των συμμετεχόντων υποστήριξε ότι μετά το σεμινάριο δεν πέτυχαν να εργαστούν στο εξωτερικό. Το 59,50% δήλωσε πως είναι ικανοποιημένοι από τον τρόπο εργασίας τους. Το 54,55% υποστήριξε ότι είναι ικανοποιημένοι από τις συνθήκες εργασίας τους και το 66,94% είναι ικανοποιημένοι συνολικά από την εργασία τους. Το 37,19% των συμμετεχόντων δήλωσε πως είναι ικανοποιημένοι από τις χρηματικές τους αμοιβές (μισθό, μπόνους, υπερωρίες) και το 39,67% είναι ικανοποιημένοι από τις μη χρηματικές τους αμοιβές (ασφάλιση, ευρύχωρο γραφείο, εταιρικό αυτοκίνητο). Συμπεράσματα: Συμπερασματικά είναι πολύ σημαντικό οι επαγγελματίες που θέλουν να ασχοληθούν με τον κλάδο των οπτικών ινών να λάβουν εξειδικευμένη εκπαίδευση μέσω σχετικών προγραμμάτων CFOT, που σχεδιάζονται με βάση τις αρχές του FOA.
title: Η δύναμη των διαστάσεων της οργανωσιακής κουλτούρας και η ανταμοιβή - Αναγνώριση των εργαζομένων στην εκπαίδευση
title: The power of dimensions of organizational culture and employee reward – Recognition in education
titleType: AlternativeTitle
Creators: name: Παντζαρτζίδου, Ειρήνη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Οργανωσιακή κουλτούρα
subject: Σύστημα ανταμοιβών
subject: Παρακίνηση
subject: Εκπαίδευση

description: Στη σύγχρονη εποχή οι ραγδαίες εξελίξεις σε κοινωνικό και οικονομικό επίπεδο, επιβάλλουν την ανάγκη αλλαγών και αυξάνουν τις απαιτήσεις. Σε αυτό το περιβάλλον οι θεωρίες των διαστάσεων της οργανωσιακής κουλτούρας, που ισοδυναμεί με τις βασικές αξίες που διατηρούν ενωμένα και προσηλωμένα στον στόχο τα μέλη ενός οργανισμού, του συστήματος ανταμοιβών, που αποτελεί τις πρακτικές αναγνώρισης και επιβράβευσης των εργαζομένων, αλλά και της παρακίνησης, που συνιστά το σύνολο των εσωτερικών και εξωτερικών κινήτρων των υπαλλήλων, βρίσκουν πεδίο εφαρμογής από όλους τους οργανισμούς, στην προσπάθεια ενίσχυσης της αποδοτικότητάς τους και της επίτευξης των οργανωσιακών στόχων. Δεδομένου ότι κάθε σχολείο λογίζεται ως ένας οργανισμός αποτελώντας μέρος της κοινωνίας, οι προσεγγίσεις αυτές βρίσκουν εφαρμογή και στον χώρο της εκπαίδευσης, ο οποίος οφείλει να ακολουθεί τις εξελίξεις. Στην παρούσα μελέτη ακολουθήθηκε η ποσοτική έρευνα με τη χρήση ερωτηματολογίων, τα οποία απαντήθηκαν από 268 εκπαιδευτικούς όλων των ειδικοτήτων Προσχολικής, Πρωτοβάθμιας και Δευτεροβάθμιας εκπαίδευσης, με σκοπό την παρουσίαση των απόψεων τους αναφορικά με την οργανωσιακή κουλτούρα των σχολικών μονάδων, το σύστημα ανταμοιβών και την παρακίνηση που λαμβάνουν και την εξέταση της ύπαρξης συσχετίσεων μεταξύ των παραγόντων αυτών. Από τα αποτελέσματα της έρευνας, τα οποία εξήχθησαν μέσω στατιστικής ανάλυσης του SPSS, διαπιστώνεται ότι οι εκπαιδευτικοί βαθμολογούν χαμηλά τα επίπεδα της οργανωσιακής κουλτούρας, το σύστημα ανταμοιβών και την παρακίνηση, γεγονός που συμφωνεί με τη βιβλιογραφία. Επίσης, διαφαίνεται θετική συσχέτιση μεταξύ της οργανωσιακής κουλτούρας και του συστήματος ανταμοιβών, της οργανωσιακής κουλτούρας και της συνολικής παρακίνησης, αλλά και του συστήματος ανταμοιβών με το σύνολο της παρακίνησης, αποτελέσματα που έρχονται σε συμφωνία με ανάλογες έρευνες. Τέλος, παρατηρείται ότι η οργανωσιακή κουλτούρα και το σύστημα ανταμοιβών προβλέπει σε μικρό βαθμό την παρακίνηση, εύρημα που ευθυγραμμίζεται με αντίστοιχες έρευνες.
Dissipation in planar resonant planetary systems
Creators: name: Delisle, J. -B.
name: Laskar, J.
name: Correia, A. C. M.
name: Boué, G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Close-in planetary systems detected by the Kepler mission present an excess of periods ratio that are just slightly larger than some low order resonant values. This feature occurs naturally when resonant couples undergo dissipation that damps the eccentricities. However, the resonant angles appear to librate at the end of the migration process, which is often believed to be an evidence that the systems remain in resonance. Here we provide an analytical model for the dissipation in resonant planetary systems valid for low eccentricities. We confirm that dissipation accounts for an excess of pairs that lie just aside from the nominal periods ratios, as observed by the Kepler mission. In addition, by a global analysis of the phase space of the problem, we demonstrate that these final pairs are non-resonant. Indeed, the separatrices that exist in the resonant systems disappear with the dissipation, and remains only a circulation of the orbits around a single elliptical fixed point. Furthermore, the apparent libration of the resonant angles can be explained using the classical secular averaging method. We show that this artifact is only due to the severe damping of the amplitudes of the eigenmodes in the secular motion.
description: 18 pages, 20 figures, accepted to A&A
Kepler And L Dwarfs
Creators: name: Gizis, John
Publisher: name: Zenodo
Year: 2014
Subjects: BDEXOCON

description: I presented results from the original Kepler and new K2 missions on L dwarfs. The L1 dwarf star WISE 1906 was monitored with both Spitzer and Kepler, revealing variability and evidence of both clouds and flares. The L8 brown dwarf WISE 0607 was recently monitored with both Kepler K2 and Spitzer, but did not vary. I discussed challenges for the K2 analysis, which is ongoing, but many L dwarfs should be monitored in the future.
description: These are the slides shown. Work funded by NASA under award No. NNX13AC18G
Topological antiferromagnetic spin-density-wave phase in an extended Kondo lattice model
Creators: name: Zhong, Yin
name: Wang, Yu-Feng
name: Wang, Yong-Qiang
name: Luo, Hong-Gang
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: By using an extended mean-field theory, we study the phase diagram of the topological Kondo lattice model on the honeycomb lattice at half-filling in which the conduction electrons are described by the Haldane model. Besides the well-defined Kondo insulator and normal antiferromagnetic spin-density-wave (N-SDW) state, it is found that a nontrivial topological antiferromagnetic SDW state (T-SDW) with a quantized Hall conductance is possible if the quasiparticle gap is dominated by the next-nearest-neighbor hopping rather than the antiferromagnetic order. By analyzing the low-energy effective Chern-Simon action and the corresponding chiral edge state, the T-SDW could be considered as a quantum anomalous Hall insulator with antiferromagnetic long-range order. This state is apparently beyond Landau-Ginzburg paradigm, which can be attributed to the interplay of quantum anomalous Hall effect and the subtle antiferromagnetic order in the Kondo-lattice-like model. While the transition between the SDW states and the Kondo insulator is found to be conventional (a first order transition), the transition between the N- and T-SDWs is, however, a topological quantum phase transition. Interestingly, such topological quantum phase transition can be described by Dirac fermions coupled to a U (1)Chern-Simon gauge field, which resembles the critical theory between bosonic integer quantum Hall phases and superfluid phase and also indicates that such a topological quantum phase transition may fall into the 3D-XY universal class. It is expected that the present work may shed light on the interplay between conduction electrons and the densely localized spins on the honeycomb lattice.
description: 11pages,3figures. Fluctuation effect is included and critical theory for the topological quantum phase transition is also derived
Extreme waves under significant wind stress
Creators: name: Gray, Alexander
Publisher: name: Imperial College London
Year: 2020

description: This study concerns the design and undertaking of a novel series of experiments, to ascertain the effect of both a co-flowing and an adverse wind over large or 'extreme’ ocean waves. Such waves may arise under severe storm conditions with significant wind forcing and have the potential to severely damage or overload offshore platforms. As such, the accurate calculation of extreme crest height statistics is of critical importance to engineers. The present work successfully replicates a range of wind and wave conditions associated with such extreme events in a laboratory setting, and measurements of extreme waves are made with a high degree of accuracy. Both deterministic (focused) and random wave conditions have been considered, and the measured data compared to the existing body of experimental research, which usually takes place in the absence of wind. Comparisons are also drawn with the statistical distributions which are commonly used in engineering design. The results of this study demonstrate a clear wind effect on the statistics of the largest crests, consideration of which is lacking from the existing body of research and best design practice. Both co-flowing and adverse wind were shown to reduce the probability of extreme crest heights for all target sea-states. Clear mechanisms are identified for these effects, using rigorous spectral and geometric analysis of the largest waves. In particular, the dominant role of wind-induced wave breaking is clearly identified as an issue of engineering significance. Experiments concerning wind over deterministic `focused’ waves also demonstrate a clear departure from the behaviour observed in previous research; this earlier work carried out under zero-wind conditions. Most notably, the introduction of overlying wind leads to significant frequency amplitude and phase changes within the focused wave group. For co-flowing wind and waves, the most analogous to real sea conditions, the magnitude of these changes is far greater than those observed the equivalent random wave cases. This finding highlights the need for an improved approach to the use of focused waves as design wave cases, which are commonly used to typify extreme random waves, when considering waves under significant wind stress.
Quantum field theory on affine bundles
Creators: name: Benini, Marco
name: Dappiaggi, Claudio
name: Schenkel, Alexander
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 81T20, 53C80, 58J45, 35Lxx

description: We develop a general framework for the quantization of bosonic and fermionic field theories on affine bundles over arbitrary globally hyperbolic spacetimes. All concepts and results are formulated using the language of category theory, which allows us to prove that these models satisfy the principle of general local covariance. Our analysis is a preparatory step towards a full-fledged quantization scheme for the Maxwell field, which emphasises the affine bundle structure of the bundle of principal U(1)-connections. As a by-product, our construction provides a new class of exactly tractable locally covariant quantum field theories, which are a mild generalization of the linear ones. We also show the existence of a functorial assignment of linear quantum field theories to affine ones. The identification of suitable algebra homomorphisms enables us to induce whole families of physical states (satisfying the microlocal spectrum condition) for affine quantum field theories by pulling back quasi-free Hadamard states of the underlying linear theories.
description: 34 pages, no figures; v2: 35 pages, compatible with version to be published in Annales Henri Poincare
Low-temperature surface conduction in the Kondo insulator SmB$_6$
Creators: name: Wolgast, Steven
name: Kurdak, Cagliyan
name: Sun, Kai
name: Allen, J. W.
name: Kim, Dae-Jeong
name: Fisk, Zachary
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the transport properties of the Kondo insulator SmB$_6$ with a specialized configuration designed to distinguish bulk-dominated conduction from surface-dominated conduction. We find that as the material is cooled below 4 K, it exhibits a crossover from bulk to surface conduction with a fully insulating bulk. We take the robustness and magnitude of the surface conductivity, as is manifest in the literature of SmB$_6$, to be strong evidence for the topological insulator metallic surface states recently predicted for this material.
description: 23 pages, 8 figures. We updated minor editorial changes and references to match the published version
Search for Extra Dimensions in diphoton events using proton-proton collisions recorded at sqrt(s) = 7 TeV with the ATLAS detector at the LHC
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The large difference between the Planck scale and the electroweak scale, known as the hierarchy problem, is addressed in certain models through the postulate of extra spatial dimensions. A search for evidence of extra spatial dimensions in the diphoton channel has been performed using the full set of proton-proton collisions at sqrt(s) = 7 TeV recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. This dataset corresponds to an integrated luminosity of 4.9 fb. The diphoton invariant mass spectrum is observed to be in good agreement with the Standard Model expectation. In the context of the model proposed by Arkani-Hamed, Dimopoulos and Dvali, 95% confidence level lower limits of between 2.52 TeV and 3.92 TeV are set on the ultraviolet cutoff scale Ms depending on the number of extra dimensions and the theoretical formalism used. In the context of the Randall--Sundrum model, a lower limit of 2.06 (1.00) TeV at 95% confidence level is set on the mass of the lightest graviton for couplings of k/Mpl = 0.1 (0.01). Combining with the ATLAS dilepton searches based on the 2011 data, the 95% confidence level lower limit on the Randall--Sundrum graviton mass is further tightened to 2.23 (1.03) TeV for k/Mpl = 0.1 (0.01).
description: 19 pages plus author list (42 pages total), 4 figures, 4 tables, submitted to New Journal of Physics. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2012-06/
Probabilistic tsunami hazard assessment: quantifying uncertainty in landslide generated waves
Creators: name: Snelling, Branwen
Publisher: name: Imperial College London
Year: 2020

description: Landslide generated waves (LGWs) have many associated uncertainties that need to be ac- counted for during a hazard analysis. The work presented in this thesis developed and applied numerical modelling techniques to investigate and quantify these sources of uncertainty. Firstly, to model the LGW source as a deformable slide, a smoothed particle hydrodynamics (SPH) simulator was improved and adapted. The simulator was tested using lab scale bench- marks and an idealised full scale LGW scenario. The effects of landslide source parameters on the wave at increasing scales were then investigated. In order to make use of the findings regarding complex LGW source models, a probabilistic sensitivity analysis on the full range of source parameters and their effect on the generated wave was performed using the SPH simulator. This showed that the geometric landslide parameters (such as volume and submergence depth) contributed more to uncertainty in the resulting wave characteristics near the source than the rheological parameters. By coupling different wave propagation models to the results from the near-field SPH simulator, it was revealed that the choice of mathematical formulation for propagation made a significant difference to which parameters affected the inundation level the most. These findings have important implications for the design of future LGW modelling studies and which parts of the model workflow should have more computational cost dedicated to them. Near the source the landslide geometry outweighs the complexity of the rheological model in terms of influence on the wave characteristics. During propagation the mathematical formulation chosen can have a large influence on results, so dedicating extra computational cost to this phase would be worthwhile.