cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Anomalous dimensions and scalar glueball spectroscopy in AdS/QCD
Creators: name: Boschi-Filho, H.
name: Braga, N. R. F.
name: Jugeau, F.
name: Torres, M. A. C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: An extended version of the AdS/QCD Soft-Wall model that incorporates QCD-like anomalous contributions to the dimensions of gauge theory operators is proposed. This exploratory approach leads to a relation between scalar glueball masses and beta functions. Using this relation, properties of the glueball mass spectroscopy that emerge from phenomenological beta functions proposed in the literature are investigated. The reverse problem is also considered: starting from a linear Regge trajectory which fits the lattice glueball masses, beta functions with different asymptotic infrared behaviours are found. Remarkably, some of them present a fixed point at finite coupling.
description: 27 pages. V4: Expanded text with more discussions. Results unchanged. To appear in EPJC
Tensor ranks on tangent developable of Segre varieties
Creators: name: Ballico, Edoardo
name: Bernardi, Alessandra
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We describe the stratification by tensor rank of the points belonging to the tangent developable of any Segre variety. We give algorithms to compute the rank and a decomposition of a tensor belonging to the secant variety of lines of any Segre variety. We prove Comon's conjecture on the rank of symmetric tensors for those tensors belonging to tangential varieties to Veronese varieties.
description: Remarks 1 and 2 modified with respect to the published version. No modifications in the main Theorem and its proof
On the flat transverse momentum dependence of the single-spin asymmetry in inclusive neutral pion production
Creators: name: Troshin, S. M.
name: Tyurin, N. E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss recent experimental results from RHIC where the flat transverse momentum dependence of a single-spin asymmetry has been found in inclusive production of neutral pions. This dependence takes place in a wide region of the transverse momenta up to $p_T=10$ GeV/c. We emphasize that similar dependence has been predicted in the nonperturbative spin filtering mechanism for the single-spin asymmetries in hadron interactions and present some implications for this mechanism from the new experimental data.
description: 11 pages, 5 figures, revised and extended version: one figure and several equations have been added, textual modifications. arXiv admin note: text overlap with arXiv:0811.3862
First studies of electron transport along small gas gaps of novel foil radiation converters for fast-neutron detectors
Creators: name: Cortesi, M.
name: Zboray, R.
name: Adams, R.
name: Dangendorf, V.
name: Breskin, A.
name: Mayer, S.
name: Hoedlmoser, H.
name: Prasser, H. -M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Novel high efficiency fast-neutron detectors were suggested for fan-beam tomography applications. They combine multi-layer polymer converters in gas medium, coupled to thick gaseous electron multipliers (THGEM). In this work we discuss the results of a systematic study of the electron transport inside a narrow gap between successive converter foils, which affects the performance of the detector, both in terms of detection efficiency and localization properties. The efficiency of transporting ionization electrons was measured along a 0.6 mm wide gas gap in 6 and 10 mm wide polymer converters Computer simulations provided conceptual understanding of the observations. For a drift lengths of 6 mm electrons were efficiently transported along the narrow gas gap, with minimal diffusion-induced losses; an average collection efficiency of 95% was achieved for the ionization electrons induced by a primary electron of a few keV initial energy. The 10 mm height converter yielded considerably lower efficiency due to electrical and mechanical flaws of the converter foils. The results indicate that detection efficiencies of around 7% can be expected for 2.5 MeV neutrons with 300 foils converters, of 6 mm height, 0.4 mm thick foils and 0.6 mm gas gap.
description: 19 pages, 18 figures, Journal of Instrumentation (JINST)
Distance to native climatic niche margins explains establishment success of alien mammals
Creators: name: Broennimann, Olivier
name: Petitpierre, Blaise
name: Chevalier, Mathieu
name: González-Suárez, Manuela
name: Jeschke, Jonathan M.
name: Rolland, Jonathan
name: Gray, Sarah M.
name: Bacher, Sven
name: Guisan, Antoine
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Community ecology
subject: Ecological modelling
subject: Evolutionary ecology
subject: Invasive species
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: One key hypothesis explaining the fate of exotic species introductions posits that the establishment of a self-sustaining population in the invaded range can only succeed within conditions matching the native climatic niche. Yet, this hypothesis remains untested for individual release events. Using a dataset of 979 introductions of 173 mammal species worldwide, we show that climate-matching to the realized native climatic niche, measured by a new Niche Margin Index (NMI), is a stronger predictor of establishment success than most previously tested life-history attributes and historical factors. Contrary to traditional climatic suitability metrics derived from species distribution models, NMI is based on niche margins and provides a measure of how distant a site is inside or, importantly, outside the niche. Besides many applications in research in ecology and evolution, NMI as a measure of native climatic niche-matching in risk assessments could improve efforts to prevent invasions and avoid costly eradications.
Spin-orbital coupling in a triplet superconductor-ferromagnet junction
Creators: name: Gentile, Paola
name: Cuoco, Mario
name: Romano, Alfonso
name: Noce, Canio
name: Manske, Dirk
name: Brydon, P. M. R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study a novel type of coupling between spin and orbital degrees of freedom which appears at triplet superconductor-ferromagnet interfaces. Using a self-consistent spatially-dependent mean-field theory, we show that increasing the angle between the ferromagnetic moment and the triplet vector order parameter enhances or suppresses the p-wave gap close to the interface, according as the gap antinodes are parallel or perpendicular to the boundary, respectively. The associated change in condensation energy establishes an orbitally-dependent preferred orientation for the magnetization. When both gap components are present, as in a chiral superconductor, we observe a first-order transition between different moment orientations as a function of the exchange field strength.
description: 5 pages, 4 figures and Supplemental Material (3 pages)
Optimal Heisenberg-style bounds for the average performance of arbitrary phase estimates
Creators: name: Berry, Dominic W.
name: Hall, Michael J. W.
name: Zwierz, Marcin
name: Wiseman, Howard M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The ultimate bound to the accuracy of phase estimates is often assumed to be given by the Heisenberg limit. Recent work seemed to indicate that this bound can be violated, yielding measurements with much higher accuracy than was previously expected. The Heisenberg limit can be restored as a rigorous bound to the accuracy provided one considers the accuracy averaged over the possible values of the unknown phase, as we have recently shown [Phys. Rev. A 85, 041802(R) (2012)]. Here we present an expanded proof of this result together with a number of additional results, including the proof of a previously conjectured stronger bound in the asymptotic limit. Other measures of the accuracy are examined, as well as other restrictions on the generator of the phase shifts. We provide expanded numerical results for the minimum error and asymptotic expansions. The significance of the results claiming violation of the Heisenberg limit is assessed, followed by a detailed discussion of the limitations of the Cramer-Rao bound.
description: 22 pages, 4 figures
U. Gerrens, Medizinisches Ethos und theologische Ethik. Karl und Dietrich Bonhoeffer in der Auseinandersetzung um Zwangssterilisation und »Euthanasie« im Nationalsozialismus, 1996
Creators: name: Thalmann, R.
Publisher: name: Francia
Year: 2019

description: -
description: Francia, Bd. 26 Nr. 3 (1999)
The Biodiversity and Geochemistry of Cryoconite Holes in Queen Maud Land, East Antarctica
Creators: name: Lutz, Stefanie
name: Ziolkowski, Lori A.
name: Benning, Liane G.
Publisher: name: Freie Universität Berlin
Year: 2019
Subjects: subject: cryoconite holes
subject: Antarctica
subject: high-throughput sequencing
subject: bacteria
subject: eukaryotes
subject: carbon
subject: 14C
subject: 13C
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften

description: Cryoconite holes are oases of microbial diversity on ice surfaces. In contrast to the Arctic, where during the summer most cryoconite holes are ‘open’, in Continental Antarctica they are most often ‘lidded’ or completely frozen year-round. Thus, they represent ideal systems for the study of microbial community assemblies as well as carbon accumulation, since individual cryoconite holes can be isolated from external inputs for years. Here, we use high-throughput sequencing of the 16S and 18S rRNA genes to describe the bacterial and eukaryotic community compositions in cryoconite holes and surrounding lake, snow, soil and rock samples in Queen Maud Land. We cross correlate our findings with a broad range of geochemical data including for the first time 13C and 14C analyses of Antarctic cryoconites. We show that the geographic location has a larger effect on the distribution of the bacterial community compared to the eukaryotic community. Cryoconite holes are distinct from the local soils in both 13C and 14C and their isotopic composition is different from similar samples from the Arctic. Carbon contents were generally low (≤0.2%) and older (6–10 ky) than the surrounding soils, suggesting that the cryoconite holes are much more isolated from the atmosphere than the soils.
Consistent reduction of charged D3-D7 systems
Creators: name: Cotrone, Aldo L.
name: Tarrio, Javier
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We provide a consistent reduction to five dimensions of the system of D3-branes at Calabi-Yau singularities coupled to D7-branes with world-volume gauge flux. The D3-branes source the dual to would-be conformal quiver theories. The D7-branes, which are homogeneously distributed in their transverse directions, are dual to massless matter in the fundamental representation at finite (baryon) density. We provide the five-dimensional action and equations of motion, and discuss a few sub-truncations. The reduction can be used in the study of transport properties and stability of D3-D7 charged systems.
description: 23 pages. v2: references added and minor changes
Gomphonella olivacea (Bacillariophyceae) – a new phylogenetic position for a well-known taxon, its typification, new species and combinations
Creators: name: Jahn, Regine
name: Kusber, Wolf-Henning
name: Skibbe, Oliver
name: Zimmermann, Jonas
name: Van, Anh Tu
name: Buczkó, Krisztina
name: Abarca, Nélida
Publisher: name: Freie Universität Berlin
Year: 2019
Subjects: subject: Bacillariophyceae
subject: diatoms
subject: genus emendation
subject: Gomphoneis
subject: Gomphonema
subject: nomenclatural types
subject: phylogeny
subject: polyphasic approach
subject: 500 Naturwissenschaften und Mathematik::580 Pflanzen (Botanik)::580 Pflanzen (Botanik)

description: Background and aims – Within the project “German Barcode of Life – Diatoms” common diatoms of German waters were routinely isolated and cultivated. In order to understand the taxonomy and phylogeny of the genus Gomphonema, one of the most common taxa of Central Europe, known currently either under the name Gomphonema olivaceum in Europe or Gomphoneis olivacea in America, was studied. Methods – Twenty unialgal strains were established from five different water bodies in Germany and one from Lake Balaton, Hungary, which supplied molecular data (18S V4 and rbcL) besides morphometric and ultrastructural data. In addition, on eight populations from different water bodies including the type from Denmark, morphometric and micromorphological studies by light and scanning electron microscopy were performed. Key results – Molecular and micromorphological data show that the target taxon neither belongs to Gomphonema Ehrenb. nor to Gomphoneis Cleve. By reinstating the genus name Gomphonella Rabenh., the nomenclatural and taxonomic enigma of this taxon is solved, and with the presentation of the type by Hornemann the authorship of the epithet is clarified. Molecular data for the unialgal strains and several environmental clones show that there is more diversity in the Gomphonella olivacea clade than can be identified morphologically. In addition, the establishment of the new species Gomphonella coxiae and Gomphonella acsiae is supported. The molecular data classified Gomphonella species as belonging to the Cymbellales but not to the Gomphonemataceae. In addition, molecular data put Gomphoneis tegelensis R.Jahn & N.Abarca also into Gomphonella. In order to make the genera Gomphoneis and Gomphonema monophyletic, their astigmate members are transferred to Gomphonella. Conclusions – The results clarify that the gomphonemoid outline is not restricted to the family Gomphonemataceae but seem to be distributed across the entire order Cymbellales. This is shown in this paper for the revived genus Gomphonella, which contains the astigmate group of Gomphoneis and Gomphonema besides the longly disputed G. olivacea. Only a polyphasic approach, combining molecular and micromorphological data for taxonomy, nomenclatural evaluation, and observations from clonal cultures can reveal the full intricacies of evolutionary relations.
The O K−2V spectrum of CO: the influence of the second core-hole
Creators: name: Koulentianos, D.
name: Carniato, S.
name: Püttner, Ralph
name: Martins, J. B.
name: Travnikova, O.
name: Marchenko, T.
name: Journel, L.
name: Guillemin, R.
name: Ismail, I.
name: Céolin, D.
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: CO
subject: O atom
subject: spectrum
subject: 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik

description: Using synchrotron radiation in the tender X-ray regime, a photoelectron spectrum showing the formation of single site double-core-hole pre-edge states, involving the K shell of the O atom in CO, has been recorded by means of high-resolution electron spectroscopy. The experimentally observed structures have been simulated, interpreted and assigned, employing state-of-the-art ab initio quantum chemical calculations, on the basis of a theoretical model, accounting for their so-called direct or conjugate character. Features appearing above the double ionization threshold have been reproduced by taking into account the strong mixing between multi-excited and continuum states. The shift of the σ* resonance below the double ionization threshold, in combination with the non-negligible contributions of multi-excited configurations in the final states reached, gives rise to a series of avoided crossings between the different potential energy curves
With a little help from my friends: The effect of social proximity on emotion regulation-related brain activity
Creators: name: Morawetz, Carmen
name: Berboth, Stella
name: Bode, Stefan
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Reappraisal
subject: Social support
subject: Social proximity
subject: Interpersonal emotion regulation
subject: Functional magnetic resonance imaging
subject: Amygdala
subject: 100 Philosophie und Psychologie::150 Psychologie::150 Psychologie

description: When experiencing negative emotions, individuals often reach out for social support to help regulate their emotions. In times of an acute crisis, however, close friends might not be available, and physical closeness might be impossible. This functional magnetic resonance imaging (fMRI) study investigated the effect of social proximity on the effectiveness of social support for regulating emotions and the underlying neural mechanisms. Participants regulated their emotions in response to negative images either alone (intrapersonal regulation), or with help of a picture and supporting sentence provided by the best friend, or by a stranger (interpersonal regulation). Regulation success was enhanced for the support of friends compared to regulating alone or with the support of strangers. This effect was accompanied by the interplay of large-scale brain networks involved in processing emotions, social cognition, and cognitive control. Interpersonal regulation appeared to be implemented by lateral prefrontal regions. The amygdala showed increased activation for strangers. The activation profile of the social cognition network suggests a role in supporting empathic and mentalizing processes. The results highlight the power of social connectedness for boosting emotion regulation ability and the different neural networks that contribute to this effect.
Investigating Everyday Musical Interaction During COVID-19: An Experimental Procedure for Exploring Collaborative Playlist Engagement
Creators: name: Harris, Ilana
name: Cross, Ian
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: musical interaction
subject: virtual
subject: social
subject: technologically-mediated
subject: empathy
subject: 100 Philosophie und Psychologie::150 Psychologie::150 Psychologie

description: Musical Group Interaction (MGI) has been found to promote prosocial tendencies, including empathy, across various populations. However, experimental study is lacking in respect of effects of everyday forms of musical engagement on prosocial tendencies, as well as whether key aspects—such as physical co-presence of MGI participants—are necessary to enhance prosocial tendencies. We developed an experimental procedure in order to study online engagement with collaborative playlists and to investigate socio-cognitive components of prosocial tendencies expected to increase as a consequence of engagement. We aimed to determine whether mere perceived presence of a partner during playlist-making could elicit observable correlates of social processing implicated in both MGI and prosocial behaviors more generally and identify the potential roles of demographic, musical, and inter-individual differences. Preliminary results suggest that for younger individuals, some of the social processes involved in joint music-making and implicated in empathic processes are likely to be elicited even by an assumption of virtual co-presence. In addition, individual differences in styles of listening behavior may mediate the effects of mere perceived partner presence on recognition memory.
K. S. B. Keats-Rohan, D. E. Thornton (Bearb.), Domesday Names. An index of latin personal and place names in Domesday Book, 1997. - K. S. B. Keats-Rohan (Bearb.), Domesday People. A prosopography of persons occuring in English documents 1066-1166. Bd. 1: Domesday Book, 1999
Creators: name: Jäschke, K.-U.
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 28 Nr. 1 (2001)
G. Brossollet, Les Français de Shanghai, 1849–1949, 1999. – A. Freyeisen, Shanghai und die Politik des Deutschen Reiches, 2000 – C. Henriot, Z. Zu'an, Atlas de Shanghai, 1999
Creators: name: Nies, Volker
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 29 Nr. 3 (2002)
In situ novel environment assay reveals acoustic exploration as a repeatable behavioral response in migratory bats
Creators: name: Schabacker, Theresa
name: Lindecke, Oliver
name: Rizzi, Sofia
name: Marggraf, Lara
name: Petersons, Gunars
name: Voigt, Christian C.
name: Snijders, Lysanne
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Animal behaviour
subject: Behavioural ecology
subject: bats
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: Integrating information on species-specific sensory perception with spatial activity provides a high-resolution understanding of how animals explore environments, yet frequently used exploration assays commonly ignore sensory acquisition as a measure for exploration. Echolocation is an active sensing system used by hundreds of mammal species, primarily bats. As echolocation call activity can be reliably quantified, bats present an excellent model system to investigate intraspecific variation in environmental cue sampling. Here, we developed an in situ roost-like novel environment assay for tree-roosting bats. We repeatedly tested 52 individuals of the migratory bat species, Pipistrellus nathusii, across 24 h, to examine the role of echolocation when crawling through a maze-type arena and test for consistent intraspecific variation in sensory-based exploration. We reveal a strong correlation between echolocation call activity and spatial activity. Moreover, we show that during the exploration of the maze, individuals consistently differed in spatial activity as well as echolocation call activity, given their spatial activity, a behavioral response we term ’acoustic exploration’. Acoustic exploration was correlated with other exploratory behaviors, but not with emergence latency. We here present a relevant new measure for exploration behavior and provide evidence for consistent (short-term) intra-specific variation in the level at which wild bats collect information from a novel environment.
Noise Analysis of Qubits Implemented in Triple Quantum Dot Systems in a Davies Master Equation Approach
Creators: name: Mehl, Sebastian
name: DiVincenzo, David P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the influence of noise for qubits implemented using a triple quantum dot spin system. We give a detailed description of the physical realization and develop error models for the dominant external noise sources. We use a Davies master equation approach to describe their influence on the qubit. The triple dot system contains two meaningful realizations of a qubit: We consider a subspace and a subsystem of the full Hilbert space to implement the qubit. We test the robustness of these two implementations with respect to the qubit stability. When performing the noise analysis, we extract the initial time evolution of the qubit using a Nakajima-Zwanzig approach. We find that the initial time evolution, which is essential for qubit applications, decouples from the long time dynamics of the system. We extract probabilities for the qubit errors of dephasing, relaxation and leakage. Using the Davies model to describe the environment simplifies the noise analysis. It allows us to construct simple toy models, which closely describe the error probabilities.
description: 30 pages, 18 figures
Angular correlations in the double Drell-Yan process
Creators: name: Kasemets, Tomas
name: Diehl, Markus
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the impact of parton correlations on the double Drell-Yan process, i.e. on the production of two electroweak gauge bosons by double parton scattering in a single proton-proton collision. Spin correlations between two partons in a proton are shown to change the overall rate of the process and to induce characteristic angular correlations between the decay leptons of the two gauge bosons.
description: 23 pages, 2 figures; v2: minor corrections and clarifications, corrected discussion of flavor interference
Review: Object vision in a structured world
Creators: name: Kaiser, Daniel
name: Quek, Genevieve L.
name: Cichy, Radoslaw M.
name: Peelen, Marius V.
Publisher: name: Freie Universität Berlin
Year: 2019
Subjects: subject: object perception
subject: real-world structure
subject: positional regularities
subject: high-level vision
subject: 100 Philosophie und Psychologie::150 Psychologie::153 Kognitive Prozesse, Intelligenz

description: In natural vision, objects appear at typical locations, both with respect to visual space (e.g., an airplane in the upper part of a scene) and other objects (e.g., a lamp above a table). Recent studies have shown that object vision is strongly adapted to such positional regularities. In this review we synthesize these developments, highlighting that adaptations to positional regularities facilitate object detection and recognition, and sharpen the representations of objects in visual cortex. These effects are pervasive across various types of high-level content. We posit that adaptations to real-world structure collectively support optimal usage of limited cortical processing resources. Taking positional regularities into account will thus be essential for understanding efficient object vision in the real world.
J. Bähr, unter Mitarbeit von M. C. Schneider, Der Goldhandel der Dresdner Bank im Zweiten Weltkrieg. Ein Bericht des Hannah-Arendt-Instituts, 1999
Creators: name: Banken, Ralf
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 29 Nr. 3 (2002)
On the representation of major stratospheric warmings in reanalyses
Creators: name: Ayarzagüena, Blanca
name: Palmeiro, Froila M.
name: Barriopedro, David
name: Calvo, Natalia
name: Langematz, Ulrike
name: Shibata, Kiyotaka
Publisher: name: Freie Universität Berlin
Year: 2019
Subjects: subject: stratospheric warmings
subject: reanalyses
subject: troposphere
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::551 Geologie, Hydrologie, Meteorologie

description: Major sudden stratospheric warmings (SSWs) represent one of the most abrupt phenomena of the boreal wintertime stratospheric variability, and constitute the clearest example of coupling between the stratosphere and the troposphere. A good representation of SSWs in climate models is required to reduce their biases and uncertainties in future projections of stratospheric variability. The ability of models to reproduce these phenomena is usually assessed with just one reanalysis. However, the number of reanalyses has increased in the last decade and their own biases may affect the model evaluation. Here we compare the representation of the main aspects of SSWs across reanalyses. The examination of their main characteristics in the pre- and post-satellite periods reveals that reanalyses behave very similarly in both periods. However, discrepancies are larger in the pre-satellite period compared to afterwards, particularly for the NCEP-NCAR reanalysis. All datasets reproduce similarly the specific features of wavenumber-1 and wavenumber-2 SSWs. A good agreement among reanalyses is also found for triggering mechanisms, tropospheric precursors, and surface response. In particular, differences in blocking precursor activity of SSWs across reanalyses are much smaller than between blocking definitions.
Particle conserving approach to ac-dc driven interacting quantum dots with superconducting leads
Creators: name: Siegl, Julian
name: Picó-Cortés, Jordi
name: Grifoni, Milena
Publisher: name: Universität Regensburg
Year: 2023
Subjects: subject: Quantum transport, Josephson junction, Quantum dot, AC drive
subject: 530 Physik

description: The combined action of a dc bias and a microwave drive on the transport characteristic of a superconductor-quantum dot-superconductor junction is investigated. To cope with time dependent nonequilibrium effects and interactions in the quantum dot, we develop a general formalism for the dynamics of the density operator based on a particle conserving approach to superconductivity. Without invoking a broken U(1) symmetry, we identify a dynamical phase connected to the coherent transfer of Cooper pairs across the junction. In the weak-coupling limit, we show that besides quasiparticle transport, proximity induced superconducting correlations manifest in anomalous pair tunneling involving the transfer of a Cooper pair. The resulting generalized master equation in presence of the microwave drive showcases the characteristic bichromatic response due to the combination of the ac Josephson effect and an ac voltage. Analytical expressions for all harmonics in the driving frequency of both the current and the reduced dot operator are given for arbitrary driving strength. For the net dc current, the resulting photon assisted processes give rise to rich current-voltage characteristics. In addition to photon assisted subgap transport, we find regions of total current inversion in the stability diagram. There, the junction acts as a pump with the net dc current flowing against the applied dc bias. The first harmonic of the current, being closely related to the nonlinear dynamic susceptibility of the junction, is discussed at finite applied dc bias.
Validation of an automated assay for measurement of bovine plasma ceruloplasmin
Creators: name: Hussein, Hussein Awad
name: Bäumer, Jacqueline
name: Staufenbiel, Rudolf
Publisher: name: Freie Universität Berlin
Year: 2019
Subjects: subject: analytical
subject: automatic
subject: ceruloplasmin
subject: cows
subject: measurement
subject: validation
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::614 Inzidenz und Prävention von Krankheiten
subject: 500 Naturwissenschaften und Mathematik::590 Tiere (Zoologie)::599 Mammalia (Säugetiere)

description: Ceruloplasmin (Cp) plays an important role in copper transport and iron metabolism, as well as Cp is also an indicator for the health status of dairy cows. The present study reports the validation of an automated assay to assess the plasma Cp in dairy cows. Plasma Cp levels were determined in 40 Holstein cows and intra- and inter-assay precision, accuracy, detection limit, and clinical validation of the assay were determined. Intra- and inter-assay coefficients of variation were
Explicit Representations of Green's Function for Linear Fractional Differential Operator with Variable Coefficients
Creators: name: Kim, Myong-Ha
name: O, Hyong-Chol
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 34A08, 26A33

description: We provide explicit representations of Green's functions for general linear fractional differential operators with {\it variable coefficients} and Riemann-Liouvilles derivatives. We assume that all their coefficients are continuous in $[0, \infty)$. Using the explicit representations for Green's function, we obtain explicit representations for solution of inhomogeneous fractional differential equation with variable coefficients of general type. Therefore the method of Green's function, which was developed in previous research for solution of fractional differential equation with constant coefficients, is extended to the case of fractional differential equations with {\it variable coefficients}.
description: 14 pages, version 4 is tex version and accepted to Journal of Fractional Calculus and Applications
Pyrometamorphic process of ceramic composite materials in pottery production in the Bronze/Iron Age of the Northern Caucasus (Russia)
Creators: name: Park, Ki Suk
name: Milke, Ralf
name: Efthimiopoulos, Ilias
name: Pausewein, Regine-Ricarda
name: Reinhold, Sabine
Publisher: name: Freie Universität Berlin
Year: 2019
Subjects: subject: prehistoric pottery
subject: pyrotechnology
subject: ceramics
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::549 Mineralogie

description: Pyrotechnology for the prehistoric pottery has been an important subject for the study of ancient production technology and technological styles. However, heterogeneous characteristics in chemical and mineralogical compositions and massive amounts of ceramic sherds at most archaeological sites make it difficult to identify production technologies. In this study, SEM-EDS/WDS, XRD and transmittance and reflectance FT-IR techniques were employed step by step, in order to overcome these limitations. The serial combination of each method covers a macro-, meso- and micro-scale and it enabled us to identify the relationship between firing temperature, reducing or oxidizing atmosphere and thermally induced mobility of Ca and Fe. Numerous ceramic pottery sherds from two archaeological sites in the North Caucasus, Ransyrt 1 (Middle-Late Bronze Age) and Kabardinka 2 (Late Bronze/Early Iron Age) were investigated and compared to the ceramics found at Levinsadovka and Saf’janovo around the Sea of Azov, Russia (Late/Final Bronze Age) for this purpose. Morphological changes by sintering and transformation of indicator minerals such as calcite, hematite, spinel, gehlenite, quartz and cis/trans-vacant 1M illite provide temperature thresholds at 675, 700, 750, 950, 1050, 1100, 1300 °C. With the laboratory based FT-IR, vibrational changes in shape, wavenumber and intensity corresponding to Si-O stretching bands yield an order and classification of the ceramics with regard to firing conditions between the samples as well as the unraveling of temperature profiles within a single sample in a 100 µm scale. With this approach, the number of archaeological ceramics could be classified according to the pyrometamorphic transformation of heterogeneous ceramic composite materials. Combined with the archaeological contexts of each site, these results will contribute to the reconstruction of local technological styles.
Blast Resistant Design of Two-Way Steel-Plate Composite (SC) Panels
Creators: name: Harmon, Joshua R
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: classificationCode: 400510
subject: Structural engineering

description: SC walls have emerged as an advantageous alternative to reinforced concrete (RC) construction for blast resistant structures. SC walls typically consist of shop fabricated steel modules which can be erected on site and filled with concrete, without additional formwork setup or removal. The steel modules typically consist of steel faceplates, tie bars between faceplates, and optional shear studs. SC members offer advantages in strength, ductility, constructability, and construction schedule when compared with RC. The behavior of SC structures have been previously demonstrated and adopted into many building design codes, but there is a knowledge gap on the post-elastic behavior of SC members in two-way bending. The desire to use SC walls for blast resistant design motivates the need to study this behavior for SC walls and slabs. In this study, the behavior of SC panels in two-way bending was evaluated by using analytical, experimental, and numerical methods.Structural mechanics was used to develop simple predictions for the static behavior of rectangular, two-way SC panels under a uniform pressure loading. These predictions include the inelastic cross-section flexural capacity, the member static resistance function, the load-mass transformation factor for SDOF analysis, out-of-plane shear demands, and rotation demands. A quick-running SDOF computer algorithm was created to conduct blast load analysis incorporating the nonlinear member behavior predicted by mechanics.The two-way bending behavior of a SC panel was experimentally investigated. A SC panel was fabricated and experimentally loaded in two-way bending until flexural failure of the panel was reached. A series of concentrated loads applied to the panel was designed to simulate the yield line pattern of a panel under a uniform applied pressure. The experimental test demonstrated the deformed shape, inelastic capacity, and progression of yield lines throughout a SC panel in two-way bending. A 2D, layered composite shell finite element analysis was benchmarked to the experimental results. The finite element modeled the inelastic flexural behavior of the SC panel, closely matching the capacity, deformed shape, and development of yield lines throughout the panel.The finite element modeling approach was used to validate the SDOF predictions of two-way SC panel behavior under static and blast pressure loadings through a parametric study. Detailed comparisons of the two modeling results were made. Iso-damage pressure-impulse diagrams for multiple SC panel geometries were developed.
Effects on the Non-Relativistic Dynamics of a Charged Particle Interacting with a Chern-Simons Potential
Creators: name: Caruso, F.
name: Helayël-Neto, J. A.
name: Martins, J.
name: Oguri, V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The hydrogen atom in two dimensions, described by a Schrödinger equation with a Chern-Simons potential, is numerically solved. Both its wave functions and eigenvalues were determined for small values of the principal quantum number $n$. The only possible states correspond to $l=0$. How the result depends on the topological mass of the photon is also discussed. In the case $n=1$, the energy of the fundamental state corresponding to different choice for the photon mass scale are found to be comprehended in the interval $-3,5 \times 10^{-3} eV \leq E \leq -9,0 \times 10^{-2} eV$, corresponding to a mean radius of the electron in the range $ (5.637 \pm 0.005) \times 10^{-8}$~cm $\leq \leq (48.87 \pm 0.03) \times 10^{-8}$~cm. In any case, the planar atom is found to be very weekly bounded showing some features similar to the Rydberg atoms in three dimensions with a Coulombian interaction.
description: 6 pages, 5 figures
Origin of the heat-induced improvement of catalytic activity and stability of MnOx electrocatalysts for water oxidation
Creators: name: Abrashev, Miroslav V.
name: Chernev, Petko
name: Kubella, Paul
name: Mohammadi, Mohammad Reza
name: Pasquini, Chiara
name: Dau, Holger
name: Zaharieva, Ivelina
Publisher: name: Freie Universität Berlin
Year: 2019
Subjects: subject: oxygen evolution reaction
subject: MnOx
subject: catalysis
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::547 Organische Chemie

description: Catalysis of the oxygen evolution reaction (OER) by earth-abundant materials in the near-neutral pH regime is of great interest as it is the key reaction for non-fossil fuel production. To address the pertinent stability problems and insufficiently understood structure–activity relations, we investigate the influence of moderate annealing (100–300 °C for 20 min) for two types of electrodeposited Mn oxide films with contrasting properties. Upon annealing, the originally inactive and structurally well-ordered Oxide 1 of birnessite type became as OER active as the non-heated Oxide 2, which has a highly disordered atomic structure. Oxide 2 also improved its activity upon heating, but more important is the stability improvement: the operation time increased by about two orders of magnitude (in 0.1 M KPi at pH 7). Aiming at atomistic understanding, electrochemical methods including quantitative analysis of impedance spectra, X-ray spectroscopy (XANES and EXAFS), and adapted optical spectroscopies (infrared, UV-vis and Raman) identified structure–reactivity relations. Oxide structures featuring both di-μ-oxo bridged Mn ions and (close to) linear mono-μ-oxo Mn3+–O–Mn4+ connectivity seem to be a prerequisite for OER activity. The latter motif likely stabilizes Mn3+ ions at higher potentials and promotes electron/hole hopping, a feature related to electrical conductivity and reflected in the strongly accelerated rates of Mn oxidation and O2 formation. Poor charge mobility, which may result from a low level of Mn3+ ions at high potentials, likely promotes inactivation after prolonged operation. Oxide structures related to the perovskite-like ζ-Mn2O3 were formed after the heating of Oxide 2 and could favour stabilization of Mn ions in oxidation states lower than +4. This rare phase was previously found only at high pressure (20 GPa) and temperature (1200 °C) and this is the first report where it was stable under ambient conditions.
Measurement of the top-quark mass in t t-bar events with dilepton final states in pp collisions at sqrt(s)=7 TeV
Creators: name: The CMS Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The top-quark mass is measured in proton-proton collisions at sqrt(s) = 7 TeV using a data sample corresponding to an integrated luminosity of 5.0 inverse femtobarns collected by the CMS experiment at the LHC. The measurement is performed in the dilepton decay channel t t-bar to ell+ nu[ell] b, ell- anti-nu[ell] b-bar, where ell=e,mu. Candidate top-quark decays are selected by requiring two leptons, at least two jets, and imbalance in transverse momentum. The mass is reconstructed with an analytical matrix weighting technique using distributions derived from simulated samples. Using a maximum-likelihood fit, the top-quark mass is determined to be 172.5 +/- 0.4 (stat) +/- 1.5 (syst) GeV.
description: Submitted to the European Physical Journal C
Does Voice Benefit or Harm Occupational Well-Being? The Role of Job Insecurity
Creators: name: Röllmann, Laura Frederike
name: Weiss, Mona
name: Zacher, Hannes
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: health
subject: voice
subject: occupational well-being
subject: 300 Sozialwissenschaften::330 Wirtschaft::330 Wirtschaft

description: Although employee voice is integral for organizational functioning, it is not well understood how voice affects occupational well-being, particularly when jobs are perceived as insecure. Drawing from the dual-pathway model of proactivity, which is based on self-determination and conservation of resources theories, we integrate theorizing on the well-being consequences of voice with the job insecurity literature. First, we hypothesize that voice leads to increases in both vigour and fatigue. Second, we propose that job insecurity moderates these effects, such that the effect of voice on increases in vigour is stronger (weaker) when job insecurity is low (high), whereas the effect of voice on increases in fatigue is stronger (weaker) when job insecurity is high (low). Seven hundred and thirty three full-time employees in Germany participated in two surveys, three months apart. Results largely supported our predictions and showed that voice led to increases in vigour. Moreover, voice predicted increases (decreases) in fatigue when job insecurity was high (low). However, voice and job insecurity did not interact in predicting changes in vigour. Reverse causal analyses showed no effects of vigour and fatigue on changes in voice. Our discussion focuses on why and how perceptions of employment relations should be considered to determine well-being consequences of voice.
A general theory for gauge-free lifting
Creators: name: Morrison, P. J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Classical Physics (physics.class-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A theory for lifting equations of motion for charged particle dynamics, subject to given electromagnetic like forces, up to a gauge-free system of coupled Hamiltonian Vlasov-Maxwell like equations is given. The theory provides very general expressions for the polarization and magnetization vector fields in terms of the particle dynamics description of matter. Thus, as is common in plasma physics, the particle dynamics replaces conventional constitutive relations for matter. Several examples are considered including the usual Vlasov-Maxwell theory, a guiding center kinetic theory, Vlasov-Maxwell theory with the inclusion of spin, and a Vlasov-Maxwell theory with the inclusion of Dirac's magnetic monopoles. All are shown to be Hamiltonian field theories and the Jacobi identity is proven directly.
Borneo coral reefs subject to high sediment loads show evidence of resilience to various environmental stressors
Creators: name: Browne, Nicola
name: Braoun, Christina
name: McIlwain, Jennifer
name: Nagarajan, Ramasamy
name: Zinke, Jens
Publisher: name: Freie Universität Berlin
Year: 2019
Subjects: subject: sedimentation
subject: coral biodiversity
subject: coral physiology
subject: bleaching
subject: benthic cover
subject: turbid reefs
subject: Borneo
subject: 500 Naturwissenschaften und Mathematik::580 Pflanzen (Botanik)::580 Pflanzen (Botanik)
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::577 Ökologie

description: For reefs in South East Asia the synergistic effects of rapid land development, insufficient environmental policies and a lack of enforcement has led to poor water quality and compromised coral health from increased sediment and pollution. Those inshore turbid coral reefs, subject to significant sediment inputs, may also inherit some resilience to the effects of thermal stress and coral bleaching. We studied the inshore turbid reefs near Miri, in northwest Borneo through a comprehensive assessment of coral cover and health in addition to quantifying sediment-related parameters. Although Miri’s Reefs had comparatively low coral species diversity, dominated by massive and encrusting forms of Diploastrea, Porites, Montipora, Favites, Dipsastrea and Pachyseris, they were characterized by a healthy cover ranging from 22 to 39%. We found a strong inshore to offshore gradient in hard coral cover, diversity and community composition as a direct result of spatial differences in sediment at distances <10 km. As well as distance to shore, we included other environmental variables like reef depth and sediment trap accumulation and particle size that explained 62.5% of variation in benthic composition among sites. Miri’s reefs showed little evidence of coral disease and relatively low prevalence of compromised health signs including bleaching (6.7%), bioerosion (6.6%), pigmentation response (2.2%), scars (1.1%) and excessive mucus production (0.5%). Tagged colonies of Diploastrea and Pachyseris suffering partial bleaching in 2016 had fully (90–100%) recovered the following year. There were, however, seasonal differences in bioerosion rates, which increased five-fold after the 2017 wet season. Differences in measures of coral physiology, like that of symbiont density and chlorophyll a for Montipora, Pachyseris and Acropora, were not detected among sites. We conclude that Miri’s reefs may be in a temporally stable state given minimal recently dead coral and a limited decline in coral cover over the last two decades. This study provides further evidence that turbid coral reefs exposed to seasonally elevated sediment loads can exhibit relatively high coral cover and be resilient to disease and elevated sea surface temperatures.
Pour une anthropologie du prélèvement seigneurial dans les campagnes médiévales (XIe-XIVe siècles). Realités et représentations paysannes. Colloque tenu à Medina del Campo du 31 mai au 3 juin 2000. Travaux réunis par M. Bourin et P. Martinez Sopena, 2004
Creators: name: Rösener, W.
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 32 Nr. 1 (2005)