cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Klimaschutz und der aktive Einsatz der Generationen
Creators: name: Koglmüller, Nadine
Year: 2023

description: Die vorliegende Masterarbeit beschäftigte sich mit dem aktiven Einsatz unterschiedlicher Generationen für den Klimaschutz. Dies erfolgte anhand der Protestbewegung „Fridays for Future“ und den Allianzen „Parents for Future“ und „Grandparents for Future“. Die Frage nach der Rolle der Generation im Klimaschutz stand im Vordergrund der Untersuchung. Dabei lag das Hauptaugenmerk auf Gemeinsamkeiten und Unterschieden der Mitglieder in den Klimaschutzbewegungen. Im Rahmen dieser Arbeit wurden die Konzepte der Generationensolidarität, Generationengerechtigkeit und außerfamilialen Generationenbeziehungen herangezogen. Um diese festzustellen wurde ein Mixed-Methods-Design mit einem quantitativen Fragebogen und nachfolgend zehn leitfadengestützte Interviews durchgeführt. Die quantitativen Daten wurden deskriptiv ausgewertet und die qualitativen Daten mit der qualitativen Inhaltsanalyse nach Mayring. Es zeigte sich, dass es sowohl Unterschiede als auch Gemeinsamkeiten zwischen den Mitgliedern gibt. Unterschiede konnten in den Ansichten bezüglich notwendiger Maßnahmen im Klimaschutz und den durchgeführten Aktionen festgestellt werden. Junge Aktivist/innen schränken sich auf individueller Ebene stärker ein und führen größere Aktionen durch, als die älteren Befragten. Gemeinsamkeiten gibt es bei den Beweggründen für die Teilnahme an einer Klimaschutzbewegung. Die Sorge um die Zukunft nachfolgender Generationen steht im Zentrum des eigenen Engagements. Das aktuelle Wohlbefinden der Teilnehmenden ist nicht ausschlaggebend für das Engagement, wohingegen die Generationszugehörigkeit ausschlaggebend für das Maß des Engagements im Klimaschutz ist, sowohl auf individueller Ebene als auch auf gesellschaftlicher. Jüngere Personen engagieren sich stärker als die älteren Personen. Es kann jedoch gesagt werden, dass zwischen den Generationen Solidarität besteht, welche vor allem von älteren Generationen ausgeht.
In search for the pairing glue in cuprates by non-equilibrium optical spectroscopy
Creators: name: Cilento, Federico
name: Conte, Stefano Dal
name: Coslovich, Giacomo
name: Banfi, Francesco
name: Ferrini, Gabriele
name: Eisaki, Hiroshi
name: Greven, Martin
name: Damascelli, Andrea
name: van der Marel, Dirk
name: Parmigiani, Fulvio
name: Giannetti, Claudio
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In strongly correlated materials the electronic and optical properties are significantly affected by the coupling of fermionic quasiparticles to different degrees of freedom, such as lattice vibrations and bosonic excitations of electronic origin. Broadband ultrafast spectroscopy is emerging as the premier technique to unravel the subtle interplay between quasiparticles and electronic or phononic collective excitations, by their different characteristic timescales and spectral responses. By investigating the femtosecond dynamics of the optical properties of Y-Bi2212 crystals over the 0.5-2 eV energy range, we disentangle the electronic and phononic contributions to the generalized electron-boson Eliashberg function, showing that the spectral distribution of the electronic excitations, such as spin fluctuations and current loops, and the strength of their interaction with quasiparticles can account for the high critical temperature of the superconducting phase transition. Finally, we discuss how the use of this technique can be extended to the underdoped region of the phase diagram of cuprates, in which a pseudogap in the quasiparticle density of states opens. The microscopic modeling of the interaction of ultrashort light pulses with unconventional superconductors will be one of the key challenges of the next-years materials science, eventually leading to the full understanding of the role of the electronic correlations in controlling the dynamics on the femtosecond timescale.
description: 15 pages, 5 figures, Invited manuscript for the proceedings of "Materials & Mechanisms of Superconductivity" (M2S), Washington, 2012
⚘ Logic as a Liberal Art ☀ Christopher S. Morrissey
Creators: name: Morrissey, Christopher S.
name: Nikitenko, Yulia
Publisher: name: Instituto de Estudos Filosóficos
Year: 2022
Subjects: Active intellect
Aristotelian syllogistic
Charles S. Peirce
Cognition
Dictum de omni et nullo
Existential graphs
Inference rules
John Deely
Language
Liberal arts
Logic
Modeling Systems
Reasoning
Semiotic animal

description: Hone your spirit... and come a step closer to the truth by breathing a sound intellectual order into all your knowing and doing.

This event, chaired by Yulia Nikitenko (Institute for Philosophical Studies), is part of the activities of the 2022 International Open Seminar on Semiotics: a Tribute to John Deely on the Fifth Anniversary of His Passing, cooperatively organized by the Institute for Philosophical Studies of the Faculty of Arts and Humanities of the University of Coimbra, the Lyceum Institute, the Deely Project, Saint Vincent College, the Iranian Society for Phenomenology at the Iranian Political Science Association, the International Association for Semiotics of Space and Time, the Institute for Scientific Information on Social Sciences of the Russian Academy of Sciences, the Semiotic Society of America, the American Maritain Association, the International Association for Semiotic Studies, the International Society for Biosemiotic Studies, the International Center for Semiotics and Intercultural Dialogue, Moscow State Academic University for the Humanities and the Mansarda Acesa with the support of the FCT - Foundation for Science and Technology, I.P., of the Ministry of Science, Technology and Higher Education of the Government of Portugal under the UID/FIL/00010/2020 project.

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C. S. Morrissey studied Ancient Greek and Latin at the University of British Columbia and has also taught classical mythology, ancient history, and ancient languages at Simon Fraser University, where he wrote his Ph.D. dissertation on hominization and the mimetic theory of René Girard: “Mirror of Princes: René Girard, Aristotle, and the Rebirth of Tragedy”. At the University of British Columbia, the M.A. thesis “Studies in Aristotle’s Physics” inaugurated a series of subsequent philosophical inquiries into the philosophy of nature. Other teaching has included Greek and Latin language courses for the Faculty of Philosophy at the Seminary of Christ the King located at the Benedictine monastery of Westminster Abbey in Mission, British Columbia. Major publications include the books Hesiod: Theogony / Works and Days (Talonbooks, 2012) and The Way of Logic (Nanjing Normal University Press, 2018).

***

Homepage: https://www.uc.pt/fluc/uidief/act/io2s
Auditorium: https://www.uc.pt/fluc/uidief/act/io2s/auditorium

***

Technical support assured by Robert Junqueira.
The cover image for the video was designed by Zahra Soltani.
Piezoelectric exciton acoustic-phonon coupling in single quantum dots
Creators: name: Sarkar, D.
name: Van Der Meulen, H.P.
name: Calleja, J.M.
name: Meyer, J.M.
name: Haug, Rolf J.
name: Pierz, Klaus
Publisher: name: College Park, MD : American Physical Society
Year: 2008
Subjects: subject: ZPL
subject: quantum dots
subject: microphotoluminescence spectroscopy
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Microphotoluminescence spectroscopy at variable temperature, excitation intensity, and energy was performed on a single InAs/AlAs self-assembled quantum dot. The exciton emission line [zero-phonon line (ZPL)] exhibits a broad sideband due to exciton acoustic-phonon coupling by the deformation-potential mechanism. Additionally, narrow low-energy sidebands at about 0.25 meV of the ZPL are attributed to exciton acoustic-phonon piezoelectric coupling. In lowering the excitation energy or intensity these bands gradually dominate the emission spectrum of the quantum dot while the ZPL disappears. At high excitation intensity the sidebands due to piezoelectric coupling decrease strongly and the ZPL dominates the spectrum as a consequence of screening of the piezoelectric coupling by the photocreated free carriers. © 2008 The American Physical Society.
Noninvasive detection of molecular bonds in quantum dots
Creators: name: Rogge, M.C.
name: Haug, Rolf J.
Publisher: name: College Park, MD : American Physical Society
Year: 2008
Subjects: subject: quantum dots
subject: molecular bonds
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We performed charge detection on a lateral triple quantum dot with starlike geometry. The setup allows us to interpret the results in terms of two double dots with one common dot. One double dot features weak tunnel coupling and can be understood with atomlike electronic states, the other one is strongly coupled forming moleculelike states. In nonlinear measurements we identified patterns that can be analyzed in terms of the symmetry of tunneling rates. Those patterns strongly depend on the strength of interdot tunnel coupling and are completely different for atomiclike or moleculelike coupled quantum dots allowing the noninvasive detection of molecular bonds. © 2008 The American Physical Society.
Influencing the conductance in biphenyl-like molecular junctions with THz radiation
Creators: name: Hinreiner, Matthias
name: Ryndyk, Dmitry A.
name: Usvyat, Denis
name: Merz, Thomas
name: Schütz, Martin
name: Richter, Klaus
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the torsional vibrations in biphenyl-like molecular junctions and transport properties in the presence of an external THz field. Ab-initio calculations including external electric fields show that the torsional angle ϕ of a thiolated biphenyl junction exhibits virtually no response. However, if functional groups are added to the molecule, creating a dipole moment in each of the rings, an external field becomes more effective for changing ϕ. A model based on the cos2ϕ dependence of the current is proposed for the biphenyl-like molecular junctions in presence of an external THz field including 2,2'-bipyridine, 3,3'-bipyridine and 2,2',4,4'- tetramethyl-3,3'-bipyridine. The current through these molecules is shown to change if the THz frequency gets in resonance to the torsional vibration mode.
description: 9 pages, 10 figures, submitted to PSSb
Magnetoresistance in a high-mobility two-dimensional electron gas
Creators: name: Bockhorn, L.
name: Barthold, P.
name: Schuh, D.
name: Wegscheider, W.
name: Haug, Rolf J.
Publisher: name: College Park, MD : American Physical Society
Year: 2011
Subjects: subject: 2DEG
subject: Magnetoresistance
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: In a high-mobility two-dimensional electron gas (2DEG) in a GaAs/Al 0.3Ga0.7As quantum well we observe a strong magnetoresistance. In lowering the electron density, the magnetoresistance gets more pronounced and reaches values of more than 300%. We observe that the huge magnetoresistance vanishes when increasing the temperature. An additional density-dependent factor is introduced to be able to fit the parabolic magnetoresistance to the electron-electron interaction correction. © 2011 American Physical Society.
title: François Poplin: Les Grands Vertfebrfes de Gönnersdorf. Fouille 1968. Franz Steiner, Wiesbaden 1976
Creators: name: Müller-Beck, Hansjürgen
Publisher: name: University Library Heidelberg
Year: 2016

description: Rezension zu: François Poplin: Les Grands Vertfebrfes de Gönnersdorf. Fouille 1968. Franz Steiner, Wiesbaden 1976, 212 S., 55 Fig., 4 Tab., 10 Taf. u. 3 Beilagen (Der Magdal6nien-Fundplatz Gönnersdorf, Band 2, herausg. v. G. Bosinski).
Bem Comum e Cuidado: duas matrizes no pensamento de Maria de Lourdes Pintasilgo
Creators: name: Magalhães, Isabel Allegro de
name: Braga, Joaquim
Publisher: name: Instituto de Estudos Filosóficos
Year: 2022
Subjects: Bem comum
Cuidado
Maria de Lourdes Pintasilgo

description: Conferência ministrada por Isabel Allegro de Magalhães e presidida por Joaquim Braga no âmbito do evento organizado pelo Instituto de Estudos Filosóficos da Faculdade de Letras da Universidade de Coimbra intitulado "Para uma ética e uma política do cuidado: Em torno dos paradigmas de Maria de Lourdes Pintasilgo", coordenado por João Maria André. Este evento contou também com apresentações de Irene Borges-Duarte, Maria Fernanda Henriques e Marília Rosado Carrilho.
Fermionic Casimir densities in anti-de Sitter spacetime
Creators: name: Elizalde, E.
name: Odintsov, S. D.
name: Saharian, A. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The fermionic condensate and vacuum expectation value of the energy-momentum tensor, for a massive fermionic field on the background of anti-de Sitter spacetime, in the geometry of two parallel boundaries with bag boundary conditions, are investigated. Vacuum expectation values, expressed as series involving the eigenvalues of the radial quantum number, are neatly decomposed into boundary-free, single-boundary-induced, and second-boundary-induced parts, with the help of the generalized Abel-Plana summation formula. In this way, the renormalization procedure is very conveniently reduced to the one corresponding to boundary-free AdS spacetime. The boundary-induced contributions to the fermionic condensate and to the vacuum expectation value of the energy density are proven to be everywhere negative. The vacuum expectation values are exponentially suppressed at distances from the boundaries much larger than the curvature radius of the AdS space. Near the boundaries, effects related with the curvature of the background spacetime are shown to be subdominant and, to leading order, all known results for boundaries in the Minkowski bulk are recovered. Zeta function techniques are successfully used for the evaluation of the total vacuum energy in the region between the boundaries. It is proven that the resulting interaction forces between them are attractive and that, for large separations, they also decay exponentially. Finally, our results are extended and explicitly translated to fermionic Casimir densities in braneworld scenarios of Randall-Sundrum type.
description: 22 pages, 2 figures
Hopping conductivity in the quantum Hall effect: Revival of universal scaling
Creators: name: Hohls, Frank
name: Zeitler, U.
name: Haug, Rolf J.
Publisher: name: College Park, MD : American Physical Society
Year: 2002
Subjects: subject: Electric conductivity
subject: Electrons
subject: Hall effect
subject: Phase transitions
subject: Thermal effects
subject: Two dimensional
subject: Hopping conductivity
subject: Quantum Hall effect
subject: Quantum Hall plateau transition
subject: Temperature dependence
subject: Universal scaling
subject: Quantum electronics
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The temperature and electric field dependence of the conductivity in the quantum Hall effect (QHE) plateau transition for samples where no universal behavior is found in the conventional temperature dependent peak-width scaling experiments was examined. A revival of universality in the variable-range hopping (VRH) regime was found. Furthermore, it was possible to rescale all the data on the Landau gap side of the transition on a single parameter function over more than 5 orders of magnitude in the conductivity.
FFT-based Kronecker product approximation to micromagnetic long-range interactions
Creators: name: Exl, Lukas
name: Abert, Claas
name: Mauser, Norbert J.
name: Schrefl, Thomas
name: Stimming, Hans Peter
name: Suess, Dieter
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 65N99, 82D40

description: We derive a Kronecker product approximation for the micromagnetic long range interactions in a collocation framework by means of separable sinc quadrature. Evaluation of this operator for structured tensors (Canonical format, Tucker format, Tensor Trains) scales below linear in the volume size. Based on efficient usage of FFT for structured tensors, we are able to accelerate computations to quasi linear complexity in the number of collocation points used in one dimension. Quadratic convergence of the underlying collocation scheme as well as exponential convergence in the separation rank of the approximations is proved. Numerical experiments on accuracy and complexity confirm the theoretical results.
description: 4 figures
Photoelectron circular dichroism of chiral molecules studied with a continuum-state-corrected strong-field approximation
Creators: name: Dreissigacker, Ingo
name: Lein, Manfred
Publisher: name: College Park, MD : American Physical Society
Year: 2014
Subjects: subject: Dichroism
subject: Molecules
subject: Photoelectrons
subject: Photoionization
subject: Photons
subject: Chiral molecule
subject: Electron distributions
subject: Fenchone
subject: Momentum distributions
subject: Plane wave
subject: Scattering state
subject: Strong field ionization
subject: Strong-field approximations
subject: Stereochemistry
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Motivated by recent experiments on circular dichroism in the photoelectron momentum distributions from strong-field ionization of chiral molecules [C. Lux, Angew. Chem. Int. Ed. 51, 5001 (2012)1433-785110.1002/anie.201109035; C. S. Lehmann, J. Chem. Phys. 139, 234307 (2013)JCPSA60021-960610.1063/1.4844295], we investigate the origin of this effect theoretically. We show that it is not possible to describe photoelectron circular dichroism with the commonly used strong-field approximation due to its plane-wave nature. We therefore apply the Born approximation to the scattering state and use this as a continuum-state correction in the strong-field approximation. We obtain electron distributions for the molecules camphor and fenchone. In order to gain physical insight into the process, we study the contributions of individual molecular orientations. © 2014 American Physical Society.
Generating functions from the viewpoint of Rota-Baxter algebras
Creators: name: Gu, Nancy Shanshan
name: Guo, Li
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Commutative Algebra (math.AC)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 05A15, 05A18, 05E40, 11B73, 13J10, 13N99

description: We study generating functions in the context of Rota-Baxter algebras. We show that exponential generating functions can be naturally viewed in a very special case of complete free commutative Rota-Baxter algebras. This allows us to use free Rota-Baxter algebras to give a broad class of algebraic structures in which generalizations of generating functions can be studied. We generalize the product formula and composition formula for exponential power series. We also give generating functions both for known number families such as Stirling numbers of the second kind and partition numbers, and for new number families such as those from not necessarily disjoint partitions and partitions of multisets.
description: 27 pages
High-order-harmonic generation from dense water microdroplets
Creators: name: Kurz, Heiko G.
name: Steingrube, Daniel S.
name: Ristau, Detlev
name: Lein, Manfred
name: Morgner, Uwe
name: Kovacev, Milutin
Publisher: name: College Park, MD : American Physical Society
Year: 2013
Subjects: subject: Expansion dynamics
subject: Focal positions
subject: Harmonic radiation
subject: Harmonic yields
subject: Intense laser pulse
subject: Phase-matching condition
subject: Pump-probe experiments
subject: Spatio-temporal dynamics
subject: Drops
subject: Harmonic generation
subject: Phase matching
subject: Probes
subject: Optical pumping
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We report on high-order-harmonic generation from micrometer-sized liquid water droplets. In pump-probe experiments, the influence of the time delay onto the emission of harmonic radiation is systematically studied. Phase-matching aspects are observed by controlling the focal position and the intensity of the probe pulse. The spatiotemporal dynamics of the droplet during interaction with intense laser pulses are studied by controlling the intensity of the pump pulse. We find transient phase-matching conditions and the expansion dynamics of the droplet to be of major influence on the harmonic yield. © 2013 American Physical Society.
Emission times in high-order harmonic generation
Creators: name: Chirilä, C.C.
name: Dreissigacker, Ingo
name: Van Der Zwan, Elmar V.
name: Lein, Manfred
Publisher: name: College Park, MD : American Physical Society
Year: 2010
Subjects: subject: Binding potential
subject: Complex trajectories
subject: Dinger equation
subject: Experimental observation
subject: Gabor transform
subject: High order harmonic generation
subject: Lewenstein model
subject: Molecular systems
subject: Nuclear motions
subject: Numerical data
subject: Quantum orbits
subject: Three dimensions
subject: Time-dependent
subject: Two-center interference
subject: Equations of motion
subject: Harmonic generation
subject: Harmonic analysis
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We calculate the emission times of the radiation in high-order harmonic generation using the Gabor transform of numerical data obtained from solving the time-dependent Schrödinger equation in one, two, and three dimensions. Both atomic and molecular systems, including nuclear motion, are investigated. Lewenstein model calculations are used to gauge the performance of the Gabor method. The resulting emission times are compared against the classical simple man's model as well as against the more accurate quantum orbit model based on complex trajectories. The influence of the range of the binding potential (long or short) on the level of agreement is assessed. Our analysis reveals that the short-trajectory harmonics are emitted slightly earlier than predicted by the quantum orbit model. This partially explains recent experimental observations for atoms and molecules. Furthermore, we observe a distinct signature of two-center interference in the emission times for H2 and D2. © 2010 The American Physical Society.
Roughening Methods to Prevent Sample Impoverishment in the Particle PHD Filter
Creators: name: Li, Tiancheng
name: Sattar, Tariq P.
name: Han, Qing
name: Sun, Shudong
Publisher: name: arXiv
Year: 2013
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: Mahler's PHD (Probability Hypothesis Density) filter and its particle implementation (as called the particle PHD filter) have gained popularity to solve general MTT (Multi-target Tracking) problems. However, the resampling procedure used in the particle PHD filter can cause sample impoverishment. To rejuvenate the diversity of particles, two easy-to-implement roughening approaches are presented to enhance the particle PHD filter. One termed as "separate-roughening" is inspired by Gordon's roughening procedure that is applied on the resampled particles. Another termed as "direct-roughening" is implemented by increasing the simulation noise of the state propagation of particles. Four proposals are presented to customize the roughening approach. Simulations are presented showing that the roughening approach can benefit the particle PHD filter, especially when the sample size is small.
description: 16th International Conference on Information Fusion(FUSION2013), 9-12 July 2013
On the origin of the warm-hot absorbers in the Milky Way's halo
Creators: name: Marasco, A.
name: Marinacci, F.
name: Fraternali, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Disc galaxies like the Milky Way are expected to be surrounded by massive coronae of hot plasma that may contain a significant fraction of the so-called missing baryons. We investigate whether the local (|vLSR|<400 km/s) warm-hot absorption features observed towards extra-Galactic sources or halo stars are consistent with being produced by the cooling of the Milky Way's corona. In our scheme, cooling occurs at the interface between the disc and the corona and it is triggered by positive supernova feedback. We combine hydrodynamical simulations with a dynamical 3D model of the galactic fountain to predict the all-sky distribution of this cooling material, and we compare it with the observed distribution of detections for different `warm' (SiIII, SiIV, CII, CIV) and `hot' (OVI) ionised species. The model reproduces the position-velocity distribution and the column densities of the vast majority of warm absorbers and about half of OVI absorbers. We conclude that the warm-hot gas responsible for most of the detections lies within a few kiloparsecs from the Galactic plane, where high-metallicity material from the disc mixes efficiently with the hot corona. This process provides an accretion of a few Mo/yr of fresh gas that can easily feed the star formation in the disc of the Galaxy. The remaining OVI detections are likely to be a different population of absorbers, located in the outskirts of the Galactic corona and/or in the circumgalactic medium of nearby galaxies.
description: 15 pages, 10 figures, accepted for publication in MNRAS
Ultrarelativistic Transport Coefficients in Two Dimensions
Creators: name: Mendoza, M.
name: Karlin, I.
name: Succi, S.
name: Herrmann, H. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the shear and bulk viscosities, as well as the thermal conductivity of an ultrarelativistic fluid obeying the relativistic Boltzmann equation in 2+1 space-time dimensions. The relativistic Boltzmann equation is taken in the single relaxation time approximation, based on two approaches, the first, due to Marle and using the Eckart decomposition, and the second, proposed by Anderson and Witting and using the Landau-Lifshitz decomposition. In both cases, the local equilibrium is given by a Maxwell-Juettner distribution. It is shown that, apart from slightly different numerical prefactors, the two models lead to a different dependence of the transport coefficients on the fluid temperature, quadratic and linear, for the case of Marle and Anderson-Witting, respectively. However, by modifying the Marle model according to the prescriptions given in Ref.[1], it is found that the temperature dependence becomes the same as for the Anderson-Witting model.
description: 14 pages, 2 figures
Robust optical clock transitions in trapped ions using dynamical decoupling
Creators: name: Aharon, Nati
name: Spethmann, Nicolas
name: Leroux, Ian D.
name: Schmidt, Piet O.
name: Retzker, Alex
Publisher: name: Bristol : Institute of Physics Publishing
Year: 2019
Subjects: subject: Dynamical decoupling
subject: Multi-ion optical clocks
subject: Optical clocks
subject: Atomic clocks
subject: Optical variables measurement
subject: Trapped ions
subject: Uncertainty analysis
subject: Amplitude fluctuations
subject: Fractional instability
subject: Frequency reference
subject: Magnitude reduction
subject: Optical clock transition
subject: Statistical uncertainty
subject: Ions
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We present a novel method for engineering an optical clock transition that is robust agaiast external field fluctuations and is able to overcome limits resulting from field inhomogeneities. The technique is based on the application of continuous driving fields to form a pair of dressed states essentially free of all relevant shifts. Specifically, the clock transition is robust to magnetic field shifts, quadrupole and other tensor shifts, and amplitude fluctuations of the driving fields. The scheme is applicable to either a single ion or an ensemble ofions, and is relevant for several types of ions, such as 40Ca, Sr1", l38BiT and 176Lo". Taking a spherically symmetric Coulomb crystal formed by 400 40Ca+ ions as an example, we show through numerical simulations that the in homogeneous linewidth of teas of Hertz in such a crystal together with linear Zeeman shifts of order 10 MHz are reduced to form a linewidth of around 1 Hz. We estimate a two-order-of-magnitude reduction in averaging time compared tostate-of-the art single ion frequency references, assuming a probe laser fractional instability of 10~1 Furthermore, a statistical uncertainty reaching2.9 x 10"16 in 1 s is estimated for a cascaded clock scheme in which the dynamically decoupled Coulomb crystal clock stabilizes the interrogation laser for an 2/Al clock.
Rational Maxwell knots via de Sitter space
Creators: name: Lechtenfeld, Olaf
name: Zhilin, G.
Publisher: name: Bristol : Institute of Physics Publishing
Year: 2019
Subjects: subject: Group theory
subject: Exact solution
subject: Explicit solutions
subject: Infinite numbers
subject: Minkowski
subject: Minkowski space-time
subject: Yang-Mills equation
subject: Rational functions
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We set up a correspondence between solutions of the Yang-Mills equations on × S 3 and in Minkowski spacetime via de Sitter space. Some known Abelian and non-Abelian exact solutions are rederived. For the Maxwell case we present a straightforward algorithm to generate an infinite number of explicit solutions, with fields and potentials in Minkowski coordinates given by rational functions of increasing complexity. We illustrate our method with some nontrivial examples.
title: Die Methode des Zeitzeug:innengesprächs zur Aufarbeitung, Analyse und Erhaltung von persönlichen Erfahrungen des Zweiten Weltkriegs (1939-1945)
Creators: name: Schuhmann, Catherina
Year: 2023

description: Zeitzeug:innengespräche als Methode zur Aufarbeitung und Analyse der Geschehnisse des Zweiten Weltkriegs sind weit verbreitet. Unklar ist jedoch, wie nachhaltig sich diese Methode entwickeln wird. Zeitzeug:innen, die Erzählungen des Kriegs aus erster Hand weitergeben können, sind zunehmend zu alt oder gar verstorben, um ihre Geschichten zu teilen. Damit die stark subjektiven Geschichten des Zweiten Weltkriegs dennoch erhalten werden können, müssen so viele Zeitzeug:innengespräche wie möglich durchgeführt werden, da die Erfahrungen ansonsten mit den Zeitzeug:innen verschwinden und die nachfolgenden Generationen die (negativen) Erlebnisse der Zeitzeug:innen im Zweiten Weltkrieg nicht mehr einordnen können. Eine relevante Frage in diesem Zusammenhang ist, wie die Informationen von Zeitzeug:innen konserviert und für zukünftige Generationen aufbereitet werden können. Unterschiedliche Institutionen, Vereine und Stiftungen haben ebenso unterschiedliche Herangehensweisen, die in der Arbeit diskutiert werden sollen. Es gibt andere Möglichkeiten, die Inhalte insbesondere für Schülerinnen und Schüler aufzuarbeiten. Wie die Zeitzeug:innengespräche durchgeführt und nachbearbeitet werden, liegt vor allem in der Hand jener Personen, die das Interview planen. Es herrscht eine gewisse Netiquette, die eingehalten werden sollte, wenn Interviews durchgeführt werden, um die Inhalte – und in weiterer Folge auch die Ergebnisse – nicht zu stark zu beeinflussen.
Photonic assisted light trapping integrated in ultrathin crystalline silicon solar cells by nanoimprint lithography
Creators: name: Trompoukis, Christos
name: Daif, Ounsi El
name: Depauw, Valérie
name: Gordon, Ivan
name: Poortmans, Jef
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report on the fabrication of two-dimensional periodic photonic nanostructures by nanoimprint lithography and dry etching, and their integration into a 1-μm-thin mono-crystalline silicon solar cell. Thanks to the periodic nanopatterning, a better in-coupling and trapping of light is achieved, resulting in an absorption enhancement. The proposed light trapping mechanism can be explained as the superposition of a graded index effect and of the diffraction of light inside the photoactive layer. The absorption enhancement is translated into a 23% increase in short-circuit current, as compared to the benchmark cell, resulting in an increase in energy-conversion efficiency.
title: Stock assessments of the bottomfish management unit species of Guam, the Commonwealth of the Northern Mariana Islands, and American Samoa, 2019
titleType: Other
Creators: name: Langseth, Brian J.
name: Syslo, John
name: Yau, Annie
name: Carvalho, Felipe
Publisher: name: United States. National Marine Fisheries Service, Pacific Fishery Management Council (U.S.)
Year: 2019

description: NOAA technical memorandum NMFS-PIFSC; 86
title: Romanisierung als theoretisches Forschungsproblem. Vorüberlegungen zu einer rumänischen Romanisierungsdebatte
Creators: name: Rubel, Alexander
Publisher: name: University Library Heidelberg
Year: 2016

description: Keywords: Romanisation, Debate on Romanisation, Romania, Romanisierung, Forschungsproblem, Romanisierungsdebatte

Includes a summary in Romanian.
The space atom laser: An isotropic source for ultra-cold atoms in microgravity
Creators: name: Meister, Matthias
name: Roura, Albert
name: Rasel, Ernst M.
name: Schleich, Wolfgang P.
Publisher: name: Bristol : Institute of Physics Publishing
Year: 2019
Subjects: subject: atom laser
subject: Bose-Einstein condensate
subject: microgravity
subject: rf outcoupling
subject: Atoms
subject: Bose-Einstein condensation
subject: Microgravity
subject: Microgravity processing
subject: NASA
subject: Space stations
subject: Statistical mechanics
subject: Adiabatic expansion
subject: Bose-Einstein condensates
subject: Experimental realizations
subject: Gravitational forces
subject: International Space stations
subject: Isotropic distributions
subject: Repulsive interactions
subject: Atom lasers
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Atom laser experiments with Bose-Einstein condensates (BECs) performed in ground-based laboratories feature a coherent and directed beam of atoms which is accelerated by gravity. In microgravity the situation is fundamentally different because the dynamics is entirely determined by the repulsive interaction between the atoms and not by the gravitational force. As a result, the output of a space atom laser is a spherical wave slowly expanding away from the initial BEC. We present a thorough theoretical study of this new source of matter waves based on rf outcoupling which exhibits an isotropic distribution both in position and momentum even for an initially anisotropic trap. The unique geometry of such a freely expanding, shell-shaped BEC offers new possibilities for matter waves in microgravity and is complementary to other matter-wave sources prepared by delta-kick collimation or adiabatic expansion. Our work paves the way for the upcoming experimental realization of a space atom laser making use of NASA's Cold Atom Laboratory on the International Space Station.
The TRAPSENSOR facility: An open-ring 7 tesla Penning trap for laser-based precision experiments
Creators: name: Gutiérrez, Manuel J.
name: Berrocal, Joaquín
name: Cornejo, Juan M.
name: Domínguez, Francisco
name: Del Pozo, Jesús J.
name: Arrazola, Iñigo
name: Bañuelos, Javier
name: Escobedo, Pablo
name: Kaleja, Oliver
name: Lamata, Lucas
name: Rica, Raúl A.
name: Schmidt, Stefan
name: Block, Michael
name: Solano, Enrique
name: Rodríguez, Daniel
Publisher: name: Bristol : Institute of Physics Publishing
Year: 2019
Subjects: subject: beam preparation
subject: fluorescence detection
subject: laser cooling
subject: mass spectrometry
subject: Penning trap
subject: Fluorescence
subject: Ion beams
subject: Ions
subject: Laser beams
subject: Laser cooling
subject: Mass spectrometry
subject: Optical systems
subject: Photons
subject: Fluorescence detection
subject: Frequency measurements
subject: Radio-frequency fields
subject: Radioactive ion beam facility
subject: Spectrometry technique
subject: Strong magnetic fields
subject: Trapped ions
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: A Penning-trap facility for high-precision mass spectrometry based on a novel detection method has been built. This method consists in measuring motional frequencies of singly-charged ions trapped in strong magnetic fields through the fluorescence photons from laser-cooled 40Ca+ ions, to overcome limitations faced in electronic single-ion detection techniques. The key element of this facility is an open-ring Penning trap coupled upstream to a preparation Penning trap similar to those used at Radioactive Ion Beam facilities. Here we present a full characterization of the trap and demonstrate motional frequency measurements of trapped ions stored by applying external radiofrequency fields in resonance with the ions' eigenmotions, in combination with time-of-flight identification. The infrastructure developed to observe the fluorescence photons from 40Ca+, comprising the 12 laser beams and the optical system to register the image in a high-sensitive CCD sensor, has been proved by taking images of the trapped and cooled 40Ca+ ions. This demonstrates the functionality of the proposed laser-based mass-spectrometry technique, providing a unique platform for precision experiments with implications in different fields of physics.
The need for open infrastructure
Creators: name: Tsang, Emmy
Publisher: name: Zenodo
Year: 2022
Subjects: open infrastructure
scholarly communication
financial sustainability
open science

description: Slides from 2022-03-22 presentation to Couperin by Emmy Tsang of Invest in Open Infrastructure.
description: This work was funded by Arcadia, a charitable fund of Lisbet Rausing and Peter Baldwin. Additional information about how our work is funded can be found here: https://investinopen.org/about/how-were-funded/
Merleau-Ponty e a obra de arte
Creators: name: Chaui, Marilena
name: Umbelino, Luís António
name: Beato, José Manuel
Publisher: name: Instituto de Estudos Filosóficos
Year: 2022
Subjects: Corpo
Fenomenologia
Merleau-Ponty
Obra de arte
Sentidos

description: Acolhida por Luís António Umbelino (FLUC - Faculdade de Letras da Universidade de Coimbra), Marilena Chaui (FFLCHUSP - Faculdade de Filosofia, Letras e Ciências Humanas da Universidade de São Paulo), ministrou uma conferência intitulada "Merleau-Ponty e a obra de arte" no âmbito dos trabalhos do 1º Colóquio "Ciclos de Filosofia", um evento cuja organização foi liderada por Artur Silva, José Sutil e Pedro Lopes, três investigadores membros do IEF - Instituto de Estudos Filosóficos da FLUC.

Nas perguntas e respostas, houve além de Luís António Umbelino um participante que formulou uma questão, designadamente José Beato, que é membro do IEF.

Para além de Marinela Chaui, foram conferencistas-chave nesta iniciativa Fernanda Bernardo (FLUC), Gyula Klima (Universidade de Fordham) e Sofia Miguens (Faculdade de Letras da Universidade do Porto).

Foi esta uma iniciativa do IEF financiado por fundos nacionais através da FCT – Fundação para a Ciência e a Tecnologia, I.P., no âmbito do projeto UIDB/00010/2020.
Atomic ionization by twisted photons: Angular distribution of emitted electrons
Creators: name: Matula, Oliver
name: Hayrapetyan, Armen G
name: Serbo, Valeriy G
name: Surzhykov, Andrey
name: Fritzsche, Stephan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the angular distribution of electrons that are emitted in the ionization of hydrogen-like ions by twisted photons. Analysis is performed based on the first-order perturbation theory and the non-relativistic Schrödinger equation. Special attention is paid to the dependence of the electron emission pattern on the impact parameter b of the ion with respect to the centre of the twisted wave front. In order to explore such a dependence, detailed calculations were carried out for the photoionization of the 1s ground and 2 py excited states of neutral hydrogen atoms. Based on these calculations, we argue that for relatively small impact parameters the electron angular distributions may be strongly affected by altering the position of the atom within the wave front. In contrast, if the atom is placed far from the front centre, the emission pattern of the electrons is independent on the impact parameter b and resembles that observed in the photoionization by plane wave photons.
description: 23 pages, 6 figures
A posterior quantum dynamics for a continuous diffusion observation of a coherent channel
Creators: name: Dabrowska, Anita
name: Staszewski, Przemysław
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present the Belavkin filtering equation for the intense balanced heterodyne detection in a unitary model of an indirect observation. The measuring apparatus modelled by a Bose field is initially prepared in a coherent state and the observed process is a diffusion one. We prove that this filtering equation is relaxing: any initial square-integrable function tends asymptotically to a coherent state with an amplitude depending on the coupling constant and the initial state of the apparatus. The time-development of a squeezed coherent state is studied and compared with the previous results obtained for the measuring apparatus prepared initially in the vacuum state.
description: 16 pages, 2 figures, the final version is available on the OSA website
3d Naturalists - Bioblitzes, Citizen Science, and Undergraduate Learning (RCN-UBE Introduction)
Creators: name: Bowser, Gillian
name: Moore, John
name: Husic, Diane
name: Mourad, Teresa
name: Monfils, Anna
Publisher: name: QUBES Educational Resources
Year: 2023

description: Citizen science and the associated new technological ability to crowdsource data may be the gateway for engaging the public in the science needed for the management, protection, and stewardship of parks. We posit that citizen science could be an effective gateway to engage new groups of students in ecological science, such as students from traditionally underrepresented groups in the sciences, because the relevance and application of citizen data involves a wider dialogue on science with an increasing diverse public. This RCN brings together scholars and practitioners to explore big data initiatives at the intersections between citizen science, minority participation, student learning, and protected areas management with three main activities: 1) interdisciplinary workshops; 2) student internships that provide introductory research experience for students using citizen science data and spatial and temporal datasets, and 3) collaborative assessments of student learning experiences through the network and the creation of student learning modules based on citizen science data.
title: Exploring empowerment: A new conceptual framework for the study of emprowerment in practice
Creators: name: Murray, Justina E.
Publisher: name: University of Glasgow
Year: 1999
Subjects: subject: Social research,

description: This thesis explores empowerment through a qualitative research study of eight Scottish voluntary and community sector projects, all of which shared a stated objective of empowerment. The research involved analysis of existing empowerment literature, in-depth interviews with key 'commentators' in the selected projects, documentary analysis and the observation of critical processes. The thesis does not seek to evaluate the effectiveness of empowerment practice, but rather proposes a new framework for critically exploring empowerment. It integrates theoretical, conceptual and empirical findings from the literature and from practice to identify and unpack empowerment's dimensions, tensions and contradictions. The proposed framework for examining empowerment is represented as a 'filebox' of four sections, reflecting four themes of empowerment - its foundations, methods, critical factors and conceptualisations. Each of these sections contains a number of 'filecards' which represent different dimensions of empowerment. Each dimension is explored via a summary, a list of key distinctions and a collection of critical questions. This new approach to examining empowerment suggests that, rather than being denied or over-simplified, the complexity and diversity of empowerment should be celebrated and indeed championed.
Relativistic Lattice Boltzmann Model with Improved Dissipation
Creators: name: Mendoza, M.
name: Karlin, I.
name: Succi, S.
name: Herrmann, H. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We develop a relativistic lattice Boltzmann (LB) model, providing a more accurate description of dissipative phenomena in relativistic hydrodynamics than previously available with existing LB schemes. The procedure applies to the ultra-relativistic regime, in which the kinetic energy (temperature) far exceeds the rest mass energy, although the extension to massive particles and/or low temperatures is conceptually straightforward. In order to improve the description of dissipative effects, the Maxwell-Juettner distribution is expanded in a basis of orthonormal polynomials, so as to correctly recover the third order moment of the distribution function. In addition, a time dilatation is also applied, in order to preserve the compatibility of the scheme with a cartesian cubic lattice. To the purpose of comparing the present LB model with previous ones, the time transformation is also applied to a lattice model which recovers terms up to second order, namely up to energy-momentum tensor. The approach is validated through quantitative comparison between the second and third order schemes with BAMPS (the solution of the full relativistic Boltzmann equation), for moderately high viscosity and velocities, and also with previous LB models in the literature. Excellent agreement with BAMPS and more accurate results than previous relativistic lattice Boltzmann models are reported.
description: 12 pages, 5 figures
Towards requirements related to future CCAM services for road usage optimization
Creators: name: Hofbauer, Florian
name: Walch, Manuel
name: Schildorfer, Wolfgang
name: Neubauer, Matthias
Publisher: name: Zenodo
Year: 2021
Subjects: CCAM
road damage prediction
Use case
Routing Recommendations

description: ESRIUM is a Horizon 2020 project, increasing the safety and resource efficiency of transport on European roads. Its key innovation is a digital map of road surface damage and road wear. The digital road wear map will contain unique information for the road operators to enhance the road maintenance planning and to provide routing recommendations (in-lane and cross-lane) to automated vehicles and conventional vehicles to avoid road damages. Through ESRIUM, transportation becomes... Smarter: Exploiting detailed driving recommendations received from the road operator in every automated and connected car. Safer: Allowing the vehicle to drive on undamaged road surface. Greener: A longer paving lifetime makes road operations greener and more resource-efficient.