cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Routes to develop a [S]/([S]+[Se]) gradient in wide band-gap Cu2ZnGe(S,Se)4 thin-film solar cells
Creators: name: Ruiz-Perona, Andrea
name: Gurieva, Galina
name: Sun, Michael
name: Kodalle, Tim
name: Sánchez, Yudania
name: Grossberg, Maarja
name: Manuel Merino, José
name: Schorr, Susan
name: León, Máximo
name: Caballero, Raquel
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Kesterite
subject: Solar cells
subject: Sodium
subject: Selenium capping layer
subject: Sulphur-gradient
subject: Wide band gap energy
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften

description: Wide band-gap kesterite-based solar cells are very attractive to be used for tandem devices as well as for semi-transparent photovoltaic cells. Here, Cu2ZnGe(S,Se)4 (CZGSSe) thin films have been grown by sulfurization of co-evaporated Cu2ZnGeSe4. The influence of a NaF precursor layer and of a Se capping film on CZGSSe absorbers and solar cells has been investigated. It has been found that the distribution of [S]/([S]+[Se]) through the CZGSSe absorber layer is strongly dependent on the Na content. Na promotes the diffusion of S towards the bulk of the absorber layer. Thicker NaF layers>6 nm lead to a higher S content in the bulk of the absorber layer, but to a decreased accumulation of sulphur at the surface, as detected by GIXRD, GD-OES, and Raman spectroscopy measurements. A relationship between Jsc, FF and Na-content supplied was found; higher Na content resulted in improved solar cell efficiencies. It has also been possible to modify the [S]/([S]+[Se])-gradient throughout the CZGSSe film by the absence of the Se capping layer, achieving devices with 2.7% performance and Eg = 2.0 eV. This work reveals two ways to control the [S]/([S]+[Se]) depth-profile to produce wide band gap CZGSSe absorber layers for efficient solar cells.
NLO corrections to hard process in QCD shower -- proof of concept
Creators: name: Jadach, S.
name: Jezabek, M.
name: Kusina, A.
name: Placzek, W.
name: Skrzypek, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The concept of new methodology of adding QCD NLO corrections in the initial state Monte Carlo parton shower (hard process part) is tested numerically using, as an example, the process of the heavy boson production at hadron--hadron colliders such as LHC. In spite of the use of a simplified model of the process, all presented numerical results prove convincingly that the basic concept of the new methodology works correctly in practice, that is in the numerical environment of the Monte Carlo parton shower event generator. The differences with the other well established methods, like MC@NLO and POWHEG, are briefly discussed and future refinements of the implementation of the new method are also outlined.
description: Acta Physica Polonica in press
Multiple Orbitoides d’Orbigny lineages in the Maastrichtian? Data from the Central Sakarya Basin (Turkey) and Arabian Platform successions (Southeastern Turkey and Oman)
Creators: name: Özcan, Ercan
name: Yücel, Ali Osman
name: Catanzariti, Rita
name: Kayğılı, Sibel
name: Okay, Aral I.
name: Simmons, Michael D.
name: Pignatti, Johannes
name: Abbasi, İftikhar Ahmed
name: Erbil, Ümitcan
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Orbitoides
subject: Maastrichtian
subject: Morphometry
subject: Central Sakarya Basin
subject: Arabian Platform margin
subject: Turkey
subject: 500 Naturwissenschaften und Mathematik::560 Fossilien, Paläontologie::560 Paläontologie, Paläozoologie

description: The standard reconstruction of species of Orbitoides d'Orbigny into a single lineage during the late Santonian to the end of the Maastrichtian is based upon morphometric data from Western Europe. An irreversible increase in the size of the embryonic apparatus, and the formation of a greater number of epi-embryonic chamberlets (EPC) with time, is regarded as the main evolutionary trends used in species discrimination. However, data from Maastrichtian Orbitoides assemblages from Central Turkey and the Arabian Platform margin (Southeastern Turkey and Oman) are not consistent with this record. The Maastrichtian Besni Formation of the Arabian Platform margin in Southeastern Turkey yields invariably biconvex specimens, with small, tri- to quadrilocular embryons and a small number of EPC, comparable to late Campanian Orbitoides medius (d'Archiac). The upper Maastrichtian Tarakli Formation from the Sakarya Basin of Central Turkey contains two distinct, yet closely associated forms of Orbitoides, easily differentiated by both external and internal features. Flat to biconcave specimens possess a small, tri- to quadrilocular embryonic apparatus of Orbitoides medius-type and a small number of EPC, whereas biconvex specimens possess a large, predominantly bilocular embryonic apparatus, and were assigned to Orbitoides ex. interc. gruenbachensis Papp-apiculatus Schlumberger based on morphometry. The flat to biconcave specimens belong to a long overlooked species Orbitoides pamiri Meric, originally described from the late Maastrichtian of the Tauride Mountains in SW Turkey. This species is herein interpreted to be an offshoot from the main Orbitoides lineage during the Maastrichtian, as are forms that we term Orbitoides 'medius', since they recall this species, yet are younger than normal occurrence with the accepted morphometrically defined lineage. The consistent correlation between the external and internal test features in O. pamiri implies that the shape of the test is not an ecophenotypic variation, but appears to be biologically controlled. We, therefore, postulate that more than one lineage of Orbitoides exists during the Maastrichtian, with a lineage that includes O. 'medius' and O. pamiri displaying retrograde evolutionary features.
A new integral formula for supersymmetric scattering amplitudes in three dimensions
Creators: name: Huang, Yu-tin
name: Lee, Sangmin
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a new integral formula for all tree-level scattering amplitudes of N=6 supersymmetric Chern-Simons theory. It resembles the Roiban-Spradlin-Volovich-Witten formula for N=4 supersymmetric Yang-Mills theory based on a twistor string theory formulation. Our formula implies that the (2k)-point tree-level amplitude is closely related to degree (k-1) curves in CP^{k-1}.
description: 4 pages; v2. references added
Involuntary unemployment and the business cycle
Creators: name: Christiano, Lawrence J.
name: Trabandt, Mathias
name: Walentin, Karl
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: DSGE
subject: Unemployment
subject: Labor force participation
subject: Business cycles
subject: Monetary policy
subject: Bayesian estimation
subject: 300 Sozialwissenschaften::330 Wirtschaft::330 Wirtschaft

description: Can a model with limited labor market insurance explain standard macro and labor market data jointly? We construct a monetary model in which: i) the unemployed are worse off than the employed, i.e. unemployment is involuntary and ii) the labor force participation rate varies with the business cycle. To illustrate key features of our model, we start with the simplest possible framework. We then integrate the model into a medium-sized DSGE model and show that the resulting model does as well as existing models at accounting for the response of standard macroeconomic variables to monetary policy shocks and two technology shocks. In addition, the model does well at accounting for the response of the labor force and unemployment rate to these three shocks.
United for Humanity: Developing a Collaborative Model for Crowd Engagement in Crisis Recovery Campaigns
Creators: name: Pestana, Maria Clara
Publisher: name: Zenodo
Year: 2023

description: Humanitarian crisis response often involves a high degree of unpredictability demand which an aid agency frequently creates. The present research aims to investigate the potential of collaboration among the entities involved in the recovery of communities affected by crises and emergencies. This investigation will focus on analyzing a crowdfunding platform to determine whether it can enhance collaboration between response entities and citizens, thus improving communication in crisis situations and, the effectiveness of crisis efforts. During times of crisis, crowdfunding has proven to be an effective tool for rapidly raising funds, increasing public awareness of the situation and can show where assistance is most needed during emergency situations. Therefore, this work proposes an in-depth analysis of a crowdfunding platform to enhance collaboration between citizens and response entities in crisis communication during disaster relief actions.
Dimensionality Reduction of Complex Metastable Systems via Kernel Embeddings of Transition Manifolds
Creators: name: Bittracher, Andreas
name: Klus, Stefan
name: Hamzi, Boumediene
name: Koltai, Péter
name: Schütte, Christof
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: alanine dipeptide
subject: diffusion maps
subject: dynamics
subject: kinetics
subject: models
subject: rates
subject: 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik

description: We present a novel kernel-based machine learning algorithm for identifying the low-dimensional geometry of the effective dynamics of high-dimensional multiscale stochastic systems. Recently, the authors developed a mathematical framework for the computation of optimal reaction coordinates of such systems that is based on learning a parameterization of a low-dimensional transition manifold in a certain function space. In this article, we enhance this approach by embedding and learning this transition manifold in a reproducing kernel Hilbert space, exploiting the favorable properties of kernel embeddings. Under mild assumptions on the kernel, the manifold structure is shown to be preserved under the embedding, and distortion bounds can be derived. This leads to a more robust and more efficient algorithm compared to the previous parameterization approaches.
String Theory Origin of Bipartite SCFTs
Creators: name: Heckman, Jonathan J.
name: Vafa, Cumrun
name: Xie, Dan
name: Yamazaki, Masahito
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We provide a string theory embedding for N = 1 superconformal field theories defined by bipartite graphs inscribed on a disk. We realize these theories by exploiting the close connection with related N = 2 generalized (A_(k-1), A_(n-1)) Argyres-Douglas theories. The N = 1 theory is obtained from spacetime filling D5-branes wrapped on an algebraic curve and NS5-branes wrapped on special Lagrangians of C^2 which intersect along the BPS flow lines of the corresponding N = 2 Argyres-Douglas theory. Dualities of the N = 1 field theory follow from geometric deformations of the brane configuration which leave the UV boundary conditions fixed. In particular we show how to recover the classification of IR fixed points from cells of the totally non-negative Grassmannian Gr^(tnn)_(k,n+k). Additionally, we present evidence that in the 3D theory obtained from dimensional reduction on a circle, VEVs of line operators given by D3-branes wrapped over faces of the bipartite graph specify a coordinate system for Gr^(tnn)_(k,n+k).
description: 45 pages, 18 figures, v2: published version in JHEP
A thermodynamic counterpart of the Axelrod model of social influence: The one-dimensional case
Creators: name: Gandica, Y.
name: Medina, E.
name: Bonalde, I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We propose a thermodynamic version of the Axelrod model of social influence. In one-dimensional (1D) lattices, the thermodynamic model becomes a coupled Potts model with a bonding interaction that increases with the site matching traits. We analytically calculate thermodynamic and critical properties for a 1D system and show that an order-disorder phase transition only occurs at T = 0 independent of the number of cultural traits q and features F. The 1D thermodynamic Axelrod model belongs to the same universality class of the Ising and Potts models, notwithstanding the increase of the internal dimension of the local degree of freedom and the state-dependent bonding interaction. We suggest a unifying proposal to compare exponents across different discrete 1D models. The comparison with our Hamiltonian description reveals that in the thermodynamic limit the original out-of-equilibrium 1D Axelrod model with noise behaves like an ordinary thermodynamic 1D interacting particle system.
description: 19 pages, 5 figures
3D Temperature Mapping of Solar Photospheric Fine Structure Using Ca II H Filtergrams
Creators: name: Henriques, V. M. J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. The wings of the Ca II H and K lines provide excellent photospheric temperature diagnostics. At the Swedish 1-meter Solar Telescope the blue wing of Ca II H is scanned with a narrowband interference filter mounted on a rotation stage. This provides up to 0"10 spatial resolution filtergrams at high cadence that are concurrent with other diagnostics at longer wavelengths. Aims. The aim is to develop observational techniques that provide the photospheric temperature stratification at the highest spatial resolution possible and use those to compare simulations and observations at different heights. Methods. We use filtergrams in the Ca II H blue wing obtained with a tiltable interference filter at the SST. Synthetic observations are produced from 3D HD and 3D MHD numerical simulations and degraded to match the observations. The temperature structure obtained from applying the method to the synthetic data is compared with the known structure in the simulated atmospheres and with observations of an active region. Cross-correlation techniques using restored non-simultaneous continuum images are used to reduce high-altitude, small-scale seeing signal introduced from the non-simultaneity of the frames when differentiating data. Results. Temperature extraction using high resolution filtergrams in the Ca II H blue wing works reasonably well when tested with simulated 3D atmospheres. The cross-correlation technique successfully compensates the problem of small-scale seeing differences and provides a measure of the spurious signal from this source in differentiated data. Synthesized data from the simulated atmospheres (including pores) match well the observations morphologically at different observed heights and in vertical temperature gradients.
description: Accepted the 10/10/2012 for publication in Astronomy & Astrophysics in Section 9, The Sun. Published the 03/12/2012 v1 to v2: changed submission metadata v2 to v3: small changes to match published version
Anticlericalismo, diplomacia y justicia revolucionaria: el fusilamiento de religiosos colombianos durante la Guerra Civil española
Creators: name: Galindo Pérez, Miguel Adolfo
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: anarquistas
subject: anticlericalismo
subject: diplomáticos
subject: fusilamientos
subject: guerra civil
subject: justicia popular
subject: 900 Geschichte und Geografie::980 Geschichte Südamerikas::986 Geschichte Kolumbiens und Ecuadors
subject: 900 Geschichte und Geografie::940 Geschichte Europas::946 Geschichte der iberischen Halbinseln und benachbarter Inseln

description: Este artículo tiene como objetivo indagar sobre la historia del asesinato de un grupo de ciudadanos colombianos pertenecientes a la Orden Hospitalaria de San Juan de Dios y a los Hijos del Corazón de María durante la Guerra Civil española. Se pretende contrastar detalladamente la información presentada sobre estos hechos en la historiografía colombiana, en fuentes inéditas conservadas en el Centro Documental de la Memoria Histórica de España, con trabajos actualizados enfocados en preocupaciones teológicas y martiriológicas, así como prensa anarquista, republicana y colombiana, para describir los últimos días de los religiosos colombianos en la península ibérica. A través de este caso, se pretende ilustrar el funcionamiento de la violencia política de corte anticlerical protagonizada por los sectores revolucionarios en la Barcelona posterior al golpe de estado fallido de julio de 1936, y la respuesta humanitaria del cuerpo diplomático colombiano frente a estos acontecimientos.
Correlating features in the primordial spectra
Creators: name: Achúcarro, Ana
name: Gong, Jinn-Ouk
name: Palma, Gonzalo A.
name: Patil, Subodh P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Heavy fields coupled to the inflaton reduce the speed of sound in the effective theory of the adiabatic mode each time the background inflationary trajectory deviates from a geodesic. This can result in features in the primordial spectra. We compute the corresponding bispectrum and show that if a varying speed of sound induces features in the power spectrum, the change in the bispectrum is given by a simple formula involving the change in the power spectrum and its derivatives. In this manner, we provide a uniquely discriminable signature of a varying sound speed for the adiabatic mode during inflation that indicates the influence of heavy fields. We find that features in the bispectrum peak in the equilateral limit and, in particular, in the squeezed limit we find considerable enhancement entirely consistent with the single field consistency relation. From the perspective of the underlying effective theory, our results generalize to a wide variety of inflationary models where features are sourced by the time variation of background quantities. A positive detection of such correlated features would be unambiguous proof of the inflaton's nature as a single light scalar degree of freedom embedded in a theory that is UV completable.
description: 5 pages, 1 figure; matches published version
Effect of electron heating on self-induced transparency in relativistic intensity laser-plasma interaction
Creators: name: Siminos, E.
name: Grech, M.
name: Skupin, S.
name: Schlegel, T.
name: Tikhonchuk, V. T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The effective increase of the critical density associated with the interaction of relativistically intense laser pulses with overcritical plasmas, known as self-induced transparency, is revisited for the case of circular polarization. A comparison of particle-in-cell simulations to the predictions of a relativistic cold-fluid model for the transparency threshold demonstrates that kinetic effects, such as electron heating, can lead to a substantial increase of the effective critical density compared to cold-fluid theory. These results are interpreted by a study of separatrices in the single-electron phase space corresponding to dynamics in the stationary fields predicted by the cold-fluid model. It is shown that perturbations due to electron heating exceeding a certain finite threshold can force electrons to escape into the vacuum, leading to laser pulse propagation. The modification of the transparency threshold is linked to the temporal pulse profile, through its effect on electron heating.
description: 13 pages, 12 figures; fixed some typos and improved discussion of review material
Inter-individual and age-dependent variability in simulated electric fields induced by conventional transcranial electrical stimulation
Creators: name: Antonenko, Daria
name: Grittner, Ulrike
name: Saturnino, Guilherme
name: Nierhaus, Till
name: Thielscher, Axel
name: Flöel, Agnes
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Aging
subject: Biophysical modelling
subject: Non-invasive brain stimulation
subject: Older Adults
subject: Simulation
subject: Transcranial direct current
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: Variations in head and brain anatomy determine the strength and distribution of electrical fields in humans and may account for inconsistent behavioral and neurophysiological results in transcranial electrical stimulation (tES) studies. However, it is insufficiently understood which anatomical features contribute to the variability of the modelled electric fields, and if their impact varies across age groups. In the present study, we tested the associations of global head anatomy, indexed by extra- and intra-cranial volumes, with electric field measures, comparing young and older adults. We modelled six "conventional" electrode montages typically used in tES studies using SimNIBS software in 40 individuals (20 young, 20 older adults; 20-35, 64-79 years). We extracted individual electric field strengths and focality values for each montage to identify tissue volumes that account for variability of the induced electric fields in both groups. Linear mixed models explained most of the inter-individual variability of the overall induced field strength in the brain, but not of field focality. Higher absolute head volume and relative volume of skin, skull and cerebrospinal fluid (CSF) were associated with lower overall electric field strengths. Additionally, we found interactions of age group with head volume and CSF, indicating that this relationship was mitigated in the older group. Our results demonstrate the importance to adjust brain stimulation not only according to brain atrophy, but also to additional parameters of head anatomy. Future studies need to elucidate the mechanisms underlying individual variability of tES effects in young and older adults, and verify the usefulness of the proposed models in terms of neurophysiology and behavior in empirical studies.
Giant Faraday effect due to Pauli exclusion principle in 3D topological insulators
Creators: name: Paudel, Hari P.
name: Leuenberger, Michael N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Experiments using ARPES, which is based on the photoelectric effect, show that the surface states in 3D topological insulators (TI) are helical. Here we consider Weyl interface fermions due to band inversion in narrow-bandgap semiconductors, such as Pb$_{1-x}$Sn$_{x}$Te. The positive and negative energy solutions can be identified by means of opposite helicity in terms of the spin helicity operator in 3D TI as $\hat{h}_{\textrm{TI}}=\left(1/\left|p_{\bot}\right|\right)β\left(\boldsymbolσ_{\perp}\times\boldsymbol{p}_{\perp}\right)\cdot\boldsymbol{\hat{z}}$, where $β$ is a Dirac matrix and $\boldsymbol{\hat{z}}$ points perpendicular to the interface. Using the 3D Dirac equation and bandstructure calculations we show that the transitions between positive and negative energy solutions, giving rise to electron-hole pairs, obey strict optical selection rules. In order to demonstrate the consequences of these selection rules, we consider the Faraday effect due to Pauli exclusion principle in a pump-probe setup using a 3D TI double interface of a PbTe/Pb$_{0.31}$Sn$_{0.69}$Te/PbTe heterostructure. For that we calculate the optical conductivity tensor of this heterostructure, which we use to solve Maxwell's equations. The Faraday rotation angle exhibits oscillations as a function of probe wavelength and thickness of the heterostructure. The maxima in the Faraday rotation angle are of the order of millirads.
description: 14 pages, 10 figures, RevTex 4
Distinct fronto-temporal substrates of distributional and taxonomic similarity among words: evidence from RSA of BOLD signals
Creators: name: Carota, Francesca
name: Nili, Hamed
name: Pulvermüller, Friedemann
name: Kriegeskorte, Nikolaus
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Conceptual taxonomies
subject: Co-occurrence statistics
subject: fMRI
subject: Representational similarity searchlights
subject: Language comprehension
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: A class of semantic theories defines concepts in terms of statistical distributions of lexical items, basing meaning on vectors of word co-occurrence frequencies. A different approach emphasizes abstract hierarchical taxonomic relationships among concepts. However, the functional relevance of these different accounts and how they capture information-encoding of lexical meaning in the brain still remains elusive. We investigated to what extent distributional and taxonomic models explained word-elicited neural responses using cross-validated representational similarity analysis (RSA) of functional magnetic resonance imaging (fMRI) and model comparisons. Our findings show that the brain encodes both types of semantic information, but in distinct cortical regions. Posterior middle temporal regions reflected lexical-semantic similarity based on hierarchical taxonomies, in coherence with the action-relatedness of specific semantic word categories. In contrast, distributional semantics best predicted the representational patterns in left inferior frontal gyrus (LIFG, BA 47). Both representations coexisted in the angular gyrus supporting semantic binding and integration. These results reveal that neuronal networks with distinct cortical distributions across higher-order association cortex encode different representational properties of word meanings. Taxonomy may shape long-term lexical-semantic representations in memory consistently with the sensorimotor details of semantic categories, whilst distributional knowledge in the LIFG (BA 47) may enable semantic combinatorics in the context of language use. Our approach helps to elucidate the nature of semantic representations essential for understanding human language.
Georg Jostkleigrewe, Monarchischer Staat und »Société politique«. Politische Interaktion und staatliche Verdichtung im spätmittelalterlichen Frankreich, Ostfildern (Jan Thorbecke Verlag) 2018
Creators: name: Müller, Heribert
Publisher: name: Francia-Recensio
Year: 2019

description: Georg Jostkleigrewe, Monarchischer Staat und »Société politique«. Politische Interaktion und staatliche Verdichtung im spätmittelalterlichen Frankreich, Ostfildern (Jan Thorbecke Verlag) 2018, 493 S., 1 Abb. (Mittelalter-Forschungen, 56), ISBN 978-3-7995-4378-1, EUR 58,00.
description: Francia-Recensio, 2019/2
Bootstrapping de Segurança como Serviço: Uma Solução Escalável para Autenticação Mútua Entre Dispositivos de IoT Baseada em Identidade das Coisas
Creators: name: Sousa, Mateus
name: Sampaio, Leobino
Publisher: name: Zenodo
Year: 2023

description: As redes IoT estão cada vez mais difundidas em nossas vidas. A diversidade de aplicações varia desde sistemas de monitoramento de temperatura até serviços de acompanhamento de saúde (e-Health). Juntamente com o vasto potencial de inovação, as redes IoT atraem cada vez mais usuários maliciosos que visam roubar dados ou prejudicar o funcionamento da rede. Com base nisso, neste trabalho trazemos uma proposta de sistema de autenticação mútua de dispositivos, que utilizam identidade descentralizada como meio de garantir autenticidade e integridade sob demanda. Validamos nossa proposta através de uma prova de conceito.
David T. Gies, Cynthia Wall (ed.), The Eighteenth Centuries. Global Networks of Enlightenment, Charlottesville, VA, London (University of Virginia Press) 2018
Creators: name: Beaurepaire, Pierre-Yves
Publisher: name: Francia-Recensio
Year: 2019

description: David T. Gies, Cynthia Wall (ed.), The Eighteenth Centuries. Global Networks of Enlightenment, Charlottesville, VA, London (University of Virginia Press) 2018, X–306 p., num. ill., ISBN 978-0-8139-4075-5, USD 39,50.
description: Francia-Recensio, 2019/2
The DUNE framework: Basic concepts and recent developments
Creators: name: Bastian, Peter
name: Blatt, Markus
name: Dedner, Andreas
name: Dreier, Nils-Arne
name: Engwer, Christian
name: Fritze, Rene
name: Gräser, Carsten
name: Grüninger, Christoph
name: Kempf, Dominic
name: Klöfkorn, Robert
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: finite-element-method
subject: discontinuous Galerkin methods
subject: generic grid interface
subject: multigrid methods
subject: elliptic problems
subject: multiscale method
subject: atmospheric flow
subject: error control
subject: 000 Informatik, Informationswissenschaft, allgemeine Werke::000 Informatik, Wissen, Systeme::004 Datenverarbeitung; Informatik

description: This paper presents the basic concepts and the module structure of the Distributed and Unified Numerics Environment and reflects on recent developments and general changes that happened since the release of the first DUNE version in 2007 and the main papers describing that state Bastian etal. (2008a, 2008b). This discussion is accompanied with a description of various advanced features, such as coupling of domains and cut cells, grid modifications such as adaptation and moving domains, high order discretizations and node level performance, non-smooth multigrid methods, and multiscale methods. A brief discussion on current and future development directions of the framework concludes the paper.
Nicola Mackie, Local Administration in Roman Spain A.D. 14 — 212
Creators: name: Galsterer, Hartmut
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: Rezension zu: Nicola Mackie, Local Administration in Roman Spain A.D. 14 — 212. British Archaeological
Reports, International Series 172, Oxford 1983. ISBN 0-86054-220-3. IX, 273 Seiten und 1 Karte.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 66 Nr. 1 (1988)
Sophie A. de Beaune, Les galets utilisés au Paléolithique supérieur
Creators: name: Mania, Dietrich
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: Rezension zu: Sophie A. de Beaune, Les galets utilisés au Paléolithique supérieur. Approche archéologique
et expérimentale. XXXIIe supplément à Gallia Préhistoire. CNRS Éditions, Paris 1997.
ISBN 2-271-05452-4; ISSN 0072-0100. 298 Seiten mit 71 Tafeln, 21 Tabellen und
107 Abbildungen.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 81 Nr. 2 (2003)
Homogenization of Coupled Fast-Slow Systems via Intermediate Stochastic Regularization
Creators: name: Engel, Maximilian
name: Gkogkas, Marios Antonios
name: Kuehn, Christian
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Deterministic homogenization
subject: Coupled systems
subject: Diffusion limit
subject: Zero-noise limit
subject: 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik

description: In this paper we study coupled fast-slow ordinary differential equations (ODEs) with small time scale separation parameter ε such that, for every fixed value of the slow variable, the fast dynamics are sufficiently chaotic with ergodic invariant measure. Convergence of the slow process to the solution of a homogenized stochastic differential equation (SDE) in the limit ε to zero, with explicit formulas for drift and diffusion coefficients, has so far only been obtained for the case that the fast dynamics evolve independently. In this paper we give sufficient conditions for the convergence of the first moments of the slow variable in the coupled case. Our proof is based upon a new method of stochastic regularization and functional-analytical techniques combined via a double limit procedure involving a zero-noise limit as well as considering ε to zero. We also give exact formulas for the drift and diffusion coefficients for the limiting SDE. As a main application of our theory, we study weakly-coupled systems, where the coupling only occurs in lower time scales.
Qubit-qudit states with positive partial transpose
Creators: name: Chen, Lin
name: Djokovic, Dragomir Z.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We show that the length of a qubit-qutrit separable state is equal to the max(r,s), where r is the rank of the state and s is the rank of its partial transpose. We refer to the ordered pair (r,s) as the birank of this state. We also construct examples of qubit-qutrit separable states of any feasible birank (r,s). We determine the closure of the set of normalized two-qutrit entangled states of rank four having positive partial transpose (PPT). The boundary of this set consists of all separable states of length at most four. We prove that the length of any qubit-qudit separable state of birank (d+1,d+1) is d+1. We also show that all qubit-qudit PPT entangled states of birank (d+1,d+1) can be built in a simple way from edge states. If V is a subspace of dimension k
description: 13 pages, 2 tables
Boris Valentin/Pierre Bodu/Marianne Christensen (Dir.), L’Europe Centrale et Septentrionale au Tardiglaciaire
Creators: name: Terberger, Thomas
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: Rezension zu: Boris Valentin/Pierre Bodu/Marianne Christensen (Dir.), L’Europe Centrale et
Septentrionale au Tardiglaciaire. Confrontation des modèles régionaux de peuplement.
Actes de la Table-ronde internationale de Nemours 14 - 15 - 16 mai 1997. Mémoires du
Musée de Préhistoire d’Ile-de-France n° 7. Nemours 2000. ISBN 2-913853-01-3; ISSN
0991-5761. 361 Seiten mit zahlreichen Abbildungen.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 81 Nr. 2 (2003)
Revisiting global trends in freshwater insect biodiversity
Creators: name: Jähnig, Sonja C.
name: Baranov, Viktor
name: Altermatt, Florian
name: Cranston, Peter
name: Friedrichs-Manthey, Martin
name: Geist, Juergen
name: He, Fengzhi
name: Heino, Jani
name: Monaghan, Michael T.
name: Tockner, Klement
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: freshwater ecosystems
subject: insect abundance
subject: long-term research
subject: threats
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: A recent global meta-analysis reported a decrease in terrestrial but increase in freshwater insect abundance and biomass (van Klink et al., Science 368, p. 417). The authors suggested that water quality has been improving, thereby challenging recent reports documenting drastic global declines in freshwater biodiversity. We raise two major concerns with the meta-analysis and suggest that these account for the discrepancy with the declines reported elsewhere. First, total abundance and biomass alone are poor indicators of the status of freshwater insect assemblages, and the observed differences may well have been driven by the replacement of sensitive species with tolerant ones. Second, many of the datasets poorly represent global trends and reflect responses to local conditions or nonrandom site selection. We conclude that the results of the meta-analysis should not be considered indicative of an overall improvement in the condition of freshwater ecosystems. This article is categorized under: Water and Life > Conservation, Management, and Awareness
Generalised connections and higher-spin equations
Creators: name: Francia, Dario
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider high-derivative equations obtained setting to zero the divergence of the higher-spin curvatures in metric-like form, showing their equivalence to the second-order equations emerging from the tensionless limit of open string field theory, which propagate reducible spectra of particles with different spins. This result can be viewed as complementary to the possibility of setting to zero a single trace of the higher-spin field strengths, which yields an equation known to imply Fronsdal's equation in the compensator form. Higher traces and divergences of the curvatures produce a whole pattern of high-derivative equations whose systematics is also presented.
description: 12 pages, minor changes
Transit Timing Variation of Near-Resonance Planetary Pairs: Confirmation of Twelve Multiple Planet Systems
Creators: name: Xie, Ji-Wei
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We extract Transit Timing Variation (TTV) signals for 12 pairs of transiting planet candidates that are near first-order Mean Motion Resonances (MMR), using publicly available Kepler light curves (Q0-Q14). These pairs show significant sinusoidal TTVs with theoretically predicted periods, which demonstrate these planet candidates are orbiting and interacting in the same system. Although individual masses cannot be accurately extracted based only on TTVs because of the well known degeneracy between mass and eccentricity, TTV phases and amplitudes can still place upper limits on the masses of the candidates, confirming their planetary nature. Furthermore, the mass ratios of these planet pairs can be relatively tight constrained using these TTVs. The planetary pair in Kepler-82 (KOI-880) seems to have a particularly high mass ratio and density ratio, which might indicate very different internal compositions of these two planets. Some of these newly confirmed planets are also near MMR with other candidates in the system, forming unique resonance chains, e.g., Kepler-80 (KOI-500).
description: Accepted to ApJS. 17 pages, 11 figures, 3 tables. KOI 869 is replaced with KOI 2038. Kepler numbers are assigned
Civic and Political Engagement during the Multifaceted COVID-19 Crisis
Creators: name: Borbáth, Endre
name: Hunger, Sophia
name: Hutter, Swen
name: Oana, Ioana-Elena
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: COVID-19
subject: Civic Engagement
subject: Political Engagement
subject: Collective Action
subject: Protest
subject: 300 Sozialwissenschaften::300 Sozialwissenschaften, Soziologie::301 Soziologie, Anthropologie

description: Measures to cope with the COVID-19 pandemic have put a sudden halt to street protests and other forms of citizen involvement in Europe. At the same time, the pandemic has increased the need for solidarity, motivating citizens to become involved on behalf of people at risk and the vulnerable more generally. This research note empirically examines the tension between the demobilisation and activation potential of the COVID-19 crisis. Drawing on original survey data from seven Western European countries, we examine the extent, forms, and drivers of citizens' engagement. Our findings show the remarkable persistence of pre-existing political and civic engagement patterns. Concurrently, we show that threat perceptions triggered by the multifaceted COVID-19 crisis have mobilized Europeans in the early phase of the pandemic. Similarly, the role of extreme ideological orientations in explaining (regular) political engagement indicates that the current situation may create its specific mobilisation potentials.
NNLL threshold resummation for top-pair and single-top production
Creators: name: Kidonakis, Nikolaos
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I discuss threshold resummation at NNLL accuracy in the standard moment-space approach in perturbative QCD for top-pair and single-top production. For top quark pair production I present new approximate NNLO results for the total cross section and for the top quark transverse momentum and rapidity distributions at 8 TeV LHC energy. I discuss the accuracy of the soft-gluon approximation and show that the NLO and NNLO approximate results from resummation are practically indistinguishable from exact NLO and partial NNLO results. For single top production I present new approximate NNLO results for the total cross sections in all three channels at the LHC and also for the top quark transverse momentum distributions in t-channel production and in top-quark associated production with a W boson. For both ttbar and single-top production the agreement of theoretical results with LHC and Tevatron data is excellent.
description: 13 pages, 6 figures; invited paper for a special issue on "Path Dependence" in Particles and Nuclei; v2 has two new plots and added text
Smart prediction for test smells refactorings
Creators: name: Martins, Luana
name: Machado, Ivan
Publisher: name: Zenodo
Year: 2023

description: Test smells are considered bad practices for developing the test code. Their presence can reduce the test code quality, thus harming software testing and maintenance activities. Software refactoring has been a key practice to handle smells and improve software quality without changing its behavior. However, existing refactoring tools target production code with very different characteristics than test code. Despite the research invested in test smell refactoring, little is known about whether current refactorings improve the test code quality. This thesis proposal presents our research to help developers decide when and how to refactor test smells through a machine learning-based approach. First, we aim to mine refactorings performed by developers to derive a catalog of test-specific refactorings and their impact on the test code. Our findings show that developers prefer specific features of the testing frameworks, which may lead to test smells such as Inappropriate Assertion and Handling Exception. While the refactorings proposed in the literature aligned with the evolution of testing frameworks helps refactoring test smells, the Inappropriate Assertion remains unexplored in the literature. Second, we aim to collect and learn from test-specific refactorings to suggest which refactorings have the potential to fix test smells. As a result, the approach could support the test smells detection and refactoring guided to the practices closer to the developers' perspective.
Geometrothermodynamics of higher dimensional black holes
Creators: name: Bravetti, Alessandro
name: Momeni, Davood
name: Myrzakulov, Ratbay
name: Quevedo, Hernando
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the thermodynamics and geometrothermodynamics of different black hole configurations in more than four spacetime dimensions. We find the conditions under which second order phase transitions occur in higher-dimensional static Reissner-Nordström and stationary Kerr black holes. Our results indicate that the equilibrium manifold of all these black hole configurations is in general curved and that curvature singularities appear exactly at those places where second order phase transitions occur.
description: Final version to be published in Gen. Rel. Grav
Mass Hierarchy Determination Using Neutrinos from Multiple Reactors
Creators: name: Ciuffoli, Emilio
name: Evslin, Jarah
name: Zhang, Xinmin
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report the results of Monte Carlo simulations of a medium baseline reactor neutrino experiment. The difference in baselines resulting from the 1 km separations of Daya Bay and Ling Ao reactors reduces the amplitudes of 1-3 oscillations at low energies, decreasing the sensitivity to the neutrino mass hierarchy. A perpendicular detector location eliminates this effect. We simulate experiments under several mountains perpendicular to the Daya Bay/Ling Ao reactors, considering in particular the background from the TaiShan and YangJiang reactor complexes. In general the hierarchy can be determined most reliably underneath the 1000 meter mountain BaiYunZhang, which is 44.5 km from Daya Bay. If some planned reactors are not built then nearby 700 meter mountains at 47-51 km baselines gain a small advantage. Neglecting their low overhead burdens, hills near DongKeng would be the optimal locations. We use a weighted Fourier transform to avoid a spurious dependence on the high energy neutrino spectrum and find that a neural network can extract quantities which determine the hierarchy marginally better than the traditional RL + PV.
description: 22 pages, added details on the neural network (journal version)
Chemical Evolution of Antivirals Against Enterovirus D68 through Protein-Templated Knoevenagel Reactions
Creators: name: Tauber, Carolin
name: Wamser, Rebekka
name: Arkona, Christoph
name: Tügend, Marisa
name: Abdul Aziz, Umer Bin
name: Pach, Szymon
name: Schulz, Robert
name: Jochmans, Dirk
name: Wolber, Gerhard
name: Rademann, Jörg
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: aldol condensations
subject: antivirals
subject: chemical evolution
subject: protease inhibition
subject: protein-templated reactions
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften

description: The generation of bioactive molecules from inactive precursors is a crucial step in the chemical evolution of life, however, mechanistic insights into this aspect of abiogenesis are scarce. Here, we investigate the protein-catalyzed formation of antivirals by the 3C-protease of enterovirus D68. The enzyme induces aldol condensations yielding inhibitors with antiviral activity in cells. Kinetic and thermodynamic analyses reveal that the bioactivity emerges from a dynamic reaction system including inhibitor formation, alkylation of the protein target by the inhibitors, and competitive addition of non-protein nucleophiles to the inhibitors. The most active antivirals are slowly reversible inhibitors with elongated target residence times. The study reveals first examples for the chemical evolution of bio-actives through protein-catalyzed, non-enzymatic C−C couplings. The discovered mechanism works under physiological conditions and might constitute a native process of drug development.