cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
WHOLE LIFE BUILT ASSET MANAGEMENT MODELLING FRAMEWORK: Integrating mitigation to earthquake induced liquefaction disaster events into strategic built asset management planning
Creators: name: Morga, Mariantonietta
name: Pascale, Federica
name: Wanigarathna, Nadeeshani
name: Zeba Majeed
name: Meslem, Abdelghani
name: Jones, Keith
Publisher: name: Zenodo
Year: 2020

description: Recent events have demonstrated that Earthquake Induced Liquefaction Disasters (EILDs) are responsible for significant structural damage with, in some cases, EILDs accounting for up to half of the economic loss caused by earthquakes. With the causes of liquefaction being largely acknowledged, it is important to recognise the factors that contribute to its occurrence; to estimate the impacts of EILD hazards; and to identify and implement the most appropriate mitigation strategies that improve both building/critical infrastructure and community resilience to an EILD event. The LIQUEFACT project adopts a holistic approach to address the mitigation of risks to EILD events. The LIQUEFACT project sets out to:
 • Achieve a more comprehensive understanding of the impacts that EILD events have on the resilience of communities and buildings/critical infrastructure on which they rely;
 • Achieve a more comprehensive understanding of the range of mitigation techniques (technical, operational, managerial and organizational) that can be implemented to improve the resilience of communities and building/critical infrastructure to EILD events;
 • Develop more appropriate mitigation techniques (technical, operational, organizational and managerial), for both European and worldwide situations; and
 • Develop a Resilience Assessment and Improvement Framework (RAIF) to allow community and building/critical infrastructure stakeholders to make the business case for mitigation interventions.
 This report summarises the work of WP5.
 • Section 1 provides an introduction to the deliverable
 • Section 2 presents the background theory to built asset management and reviews its application to mitigation and adaptation studies
 • Section 3 presents the final beta test version of the community resilience to EILD events toolkit
 • Section 4 presents the final beta test version of the critical infrastructure toolkit
 • Section 5 presents the final beta test version of the cost benefit analysis toolkit
 • Section 6 presents the final beta test version of the Resilience Assessment and Improvement Framework
 • Section 7 presents the final beta test version of the built asset management planning Toolkit
 • Section 8 outlines the next steps in the validation of the toolkits
Large-amplitude chirped coherent phonons in tellurium mediated by ultrafast photoexcited carrier diffusion
Creators: name: Kamaraju, N.
name: Kumar, Sunil
name: Anija, M.
name: Sood, A. K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report femtosecond time-resolved reflectivity measurements of coherent phonons in tellurium performed over a wide range of temperatures (3K to 296K) and pump laser intensities. A totally symmetric A$_{1}$ coherent phonon at 3.6 THz responsible for the oscillations in the reflectivity data is observed to be strongly positively chirped (i.e, phonon time period decreases at longer pump-probe delay times) with increasing photoexcited carrier density, more so at lower temperatures. We show for the first time that the temperature dependence of the coherent phonon frequency is anomalous (i.e, increasing with increasing temperature) at high photoexcited carrier density due to electron-phonon interaction. At the highest photoexcited carrier density of $\sim$ 1.4 $\times$ 10$^{21}$cm$^{-3}$ and the sample temperature of 3K, the lattice displacement of the coherent phonon mode is estimated to be as high as $\sim$ 0.24 Å. Numerical simulations based on coupled effects of optical absorption and carrier diffusion reveal that the diffusion of carriers dominates the non-oscillatory electronic part of the time-resolved reflectivity. Finally, using the pump-probe experiments at low carrier density of 6 $\times$ 10$^{18}$ cm$^{-3}$, we separate the phonon anharmonicity to obtain the electron-phonon coupling contribution to the phonon frequency and linewidth.
description: 22 pages, 6 figures, submitted to PRB
Efficient semiclassical approach for time delays
Creators: name: Kuipers, Jack
name: Savin, Dmitry V.
name: Sieber, Martin
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: The Wigner time delay, defined by the energy derivative of the total scattering phase shift, is an important spectral measure of an open quantum system characterising the duration of the scattering event. It is related to the trace of the Wigner-Smith matrix Q that also encodes other time-delay characteristics. For chaotic cavities, these exhibit universal fluctuations that are commonly described within random matrix theory. Here, we develop a new semiclassical approach to the time-delay matrix which is formulated in terms of the classical trajectories that connect the exterior and interior regions of the system. This approach is superior to previous treatments because it avoids the energy derivative. We demonstrate the method's efficiency by going beyond previous work in studying the time-delay statistics for chaotic cavities with perfectly connected leads. In particular, the universality for moment generating functions of the proper time-delays (eigenvalues of Q) is established up to third order in the inverse number of scattering channels for systems with and without time-reversal symmetry. Semiclassical results are then obtained for a further two orders. We also show the equivalence of random matrix and semiclassical results for the second moments and for the variance of the Wigner time delay at any channel number.
title: "Eros in ceppi", arte romana, inv. CXIII (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Ciccarello, Giulia
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
LENGUA DE SEÑAS APLICADO A LA SEGURIDAD INDUSTRIAL PARA LA EJECUCIÓN DE ACTIVIDADES ELÉCTRICAS DESENERGIZADAS
Creators: name: Johana, Chiliquinga
name: Angel, Quinatoa
name: Vicente, Quispe
name: Gloria, Tutillo
Publisher: name: Zenodo
Year: 2025

description: Las actividades eléctricas son las que generan mayor riesgo eléctrico en la seguridad industrial dentro del personal técnico en las etapas funcionales de la administración de la electricidad, las centrales de generación de energía en plena operación provocan contaminación auditiva debido al funcionamiento de grandes máquinas eléctricas, mecánicas, hidráulicos, etc., que dificulta la comunicación oral entre el personal, igual ocurre en la transmisión y distribución de la energía debido a que el personal técnico desarrolla sus actividades de trabajo a distancia o en altura. Post pandemia del COVID-19 las personas optaron por utilizar la mascarilla como protección de su salud, esto dificulta la comunicación oral entre las personas y las actividades eléctricas no están exentas de esta realidad. La comunicación adecuada entre el personal técnico en la operación y/o construcción de sistemas eléctricos en diferentes niveles de voltaje constituye en la parte fundamental para evitar accidentes o incidentes de trabajo, por ello, se realiza la adaptación a la lengua de señas instrucciones eléctricas, terminología en general, herramientas y equipos básicos de un electricista, esto permitirá una mejor comunicación entre los técnicos donde la contaminación auditiva dificulte la comunicación oral. Finalmente constituye una iniciativa inclusiva para personas con discapacidad auditiva.
A Simple Attack on Some Clock-Controlled Generators
Creators: name: Caballero-Gil, P.
name: Fúster-Sabater, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: We present a new approach to edit distance attacks on certain clock-controlled generators, which applies basic concepts of Graph Theory to simplify the search trees of the original attacks in such a way that only the most promising branches are analyzed. In particular, the proposed improvement is based on cut sets defined on some graphs so that certain shortest paths provide the edit distances. The strongest aspects of the proposal are that the obtained results from the attack are absolutely deterministic, and that many inconsistent initial states of the target registers are recognized beforehand and avoided during search.
title: La motivation des filles et des garçons en cours d'éducation physique et sportive au secondaire I :
title: étude comparée entre des cours en situation mixte et unisexe
titleType: Subtitle
title: La motivation des filles et des garçons en cours d'éducation physique et sportive au secondaire I :
titleType: AlternativeTitle
Creators: name: Marguet, Nicolas
name: Crausaz, Drayan
Publisher: name: Unknown
Year: 0
Subjects: subject: mixité / non-mixité
subject: EPS
subject: motivation
subject: adolescence
subject: élèves

description: Ce mémoire s'inscrit dans le cadre pédagogique des questions sur la mixité. Il tente d'appréhender les représentations des élèves sur l’éducation physique et sportive (EPS) et montre que la mixité est encore un progrès inachevé. Au travers d’une approche multi-référentielle, à la fois quantitative sous forme de questionnaire et qualitative avec des observations de focus groupe et des entretiens d’autoconfrontation, cette étude analyse les avantages et inconvénients de la mixité et la non-mixité scolaire. L’identification de profils d’élèves ainsi que les préférences contextuelles ont été comparé dans ce mémoire aussi bien pour les filles que les garçons. Les résultats montrent, qu'au secondaire 1, la situation de mixité pose problème en général lorsque les filles et les garçons sont confrontés les uns aux autres. Ainsi, quand des arguments de niveau pour une EPS séparée sont avancés par les garçons, les filles y voient plus un souci comportemental de la part des garçons sous forme d’insulte, de violence ou encore de gêne. Tous avancent par contre l’attrait de la mixité sous l’angle de l’ambiance de classe et des possibilités de séduction. Les questions sur les stéréotypes de genre sont aussi abordées au regard des APS et aux rôles de sexe qu'elles génèrent. Enfin les relations enseignants-élève en mixité et non-mixité sont analysés en rapport avec les préférences des élèves. La qualité des relations ne semble pas dans notre étude influencée par le sexe ou l’âge de l’enseignant et donc met en exergue la corrélation entre qualité relationnel de l’enseignant-e et le bon déroulement des cours d’EPS. C’est pourquoi il est impératif pour le futur que les enseignants continuent à différencier leur enseignement. Ils doivent continuer à se poser des questions et à mettre en pratique les valeurs que véhicule la mixité et la non-mixité.
Reststrahl band-assisted photocurrents in epitaxial grahene layers
Creators: name: Olbrich, Peter
name: Drexler, Christoph
name: Golub, L. E.
name: Danilov, S. N.
name: Shalygin, V. A.
name: Yakimova, R.
name: Lara-Avila, S.
name: Kubatkin, S.
name: Redlich, B.
name: Huber, Rupert
name: Ganichev, Sergey
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 530 Physik

description: We report on the observation of the reststrahl band-assisted photocurrents in epitaxial graphene on SiC excited by infrared radiation. The peculiar spectral dependence for frequencies lying within the reststrahl band of the SiC substrate provides a direct and noninvasive way to probe the electric field magnitude at atomic distances from the material's surface. Furthermore our results reveal that nonlinear optical and optoelectronic phenomena in two-dimensional crystals and other atomic scale structures can be giantly enhanced by their deposition on a substrate with negative dielectric constant.
title: La motivation des élèves en EPS au secondaire I :
title: dans quelles conditions les élèves sont-ils motivés par leurs cours d’EPS ?
titleType: Subtitle
title: La motivation des élèves en EPS au secondaire I :
titleType: AlternativeTitle
Creators: name: Cirak, Midhat
name: El Zahar, Mehdi
Publisher: name: Unknown
Year: 0

description: Bien que de nombreuses études en éducation physique et sportive aient révélé que l’intérêt en situation constitue une variable motivationnelle importante lorsqu’il s’agit d’engager les élèves dans une tâche d’apprentissage, et que les enseignants d’EPS peuvent agir sur ce dernier en manipulant les caractéristiques de ladite tâche, aucune étude n’a examiné les liens entre l’intérêt individuel et l’intérêt en situation en EPS. Ainsi, le but de cette étude est d’explorer comment évolue l’intérêt en situation des élèves lorsqu’ils sont conditionnés dans un contexte d’enseignement de maîtrise par rapport à un contexte d’enseignement de performance à travers une situation d’apprentissage de football, tout en tenant compte de l’intérêt individuel des élèves pour cette activité. Les participants, au nombre de 47 élèves du secondaire I, ont pratiqué une activité commune, le football, en étant engagé dans deux contextes différents (maîtrise et performance). Les récoltes de données permettant de mesurer l’intérêt individuel mais également la compétence perçue, ainsi que les buts poursuivis des élèves en EPS ont été réalisées avant le début de l’activité, tandis que la passation du questionnaire permettant de mesurer, selon le contexte donné l’intérêt en situation des élèves, s’est faite à la fin de chaque contexte. Après avoir réalisé une analyse multivariée (MANOVA) à mesures répétées, ainsi que des analyses de corrélations, les résultats ont révélé que les élèves sont plus motivés dans un contexte de maîtrise par rapport à un contexte de performance.
The search for slow moving planets in the distant solar system
Creators: name: Ashton, Edward James
Publisher: name: University of British Columbia
Year: 2017

description: Out beyond the giant planets is a collection of bodies left over from planet formation. The objects that are just beyond Neptune are well studied compared to those that journey hundreds of au away; all such objects have been observed inside 100 au. We use a deep narrow survey and an uncommon technique to search for objects currently at large heliocentric distances. Using data from the Outer Solar System Origins Survey (OSSOS), which covered ∼160 square degrees down to r ∼ 25, we searched for objects beyond 300 au. To find such objects we created a catalogue of all of the objects that were stationary of the astronomical seeing in three images taken over 2 hours. We then examined the stationary objects that were no longer there days/weeks/months before and after the three images. Although other astronomical phenomena like supernovae where discovered, no slow moving solar system object was found. From the null detection and using a survey simulator we obtain a 95% upper limit to the number of dwarf planets (-3 > H > 2) in the distant solar system, 1100 (+1700/−800). To our knowledge this is the first published limit for dwarf planets beyond several hundred au.
The Uncertainty Relation for Smooth Entropies
Creators: name: Tomamichel, Marco
name: Renner, Renato
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Uncertainty relations give upper bounds on the accuracy by which the outcomes of two incompatible measurements can be predicted. While established uncertainty relations apply to cases where the predictions are based on purely classical data (e.g., a description of the system's state before measurement), an extended relation which remains valid in the presence of quantum information has been proposed recently [Berta et al., Nat. Phys. 6, 659 (2010)]. Here, we generalize this uncertainty relation to one formulated in terms of smooth entropies. Since these entropies measure operational quantities such as extractable secret key length, our uncertainty relation is of immediate practical use. To illustrate this, we show that it directly implies security of a family of quantum key distribution protocols including BB84. Our proof remains valid even if the measurement devices used in the experiment deviate arbitrarily from the theoretical model.
description: Weakened claim concerning semi device-independence in the application to QKD. A full security proof for this setup without any restrictions on the measurement devices can be found in arXiv:1210.4359
Ultrafast insulator-metal phase transition in VO2 studied by multiterahertz spectroscopy
Creators: name: Pashkin, A.
name: Kübler, C.
name: Ehrke, H.
name: Lopez, R.
name: Halabica, A.
name: Haglund Jr., R. F.
name: Huber, Rupert
name: Leitenstorfer, A.
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: 530 Physik

description: The ultrafast photoinduced insulator-metal transition in VO2 is studied at different temperatures and excitation fluences using multi-THz probe pulses. The spectrally resolved midinfrared response allows us to trace separately the dynamics of lattice and electronic degrees of freedom with a time resolution of 40 fs. The critical fluence of the optical pump pulse, which drives the system into a long-lived metallic state, is found to increase with decreasing temperature. Under all measurement conditions, we observe a modulation of the eigenfrequencies of the optical phonon modes induced by their anharmonic coupling to the coherent wave-packet motion of V-V dimers at 6.1 THz. Furthermore, we find a weak quadratic coupling of the electronic response to the coherent dimer oscillation resulting in a modulation of the electronic conductivity at twice the frequency of the wave-packet motion. The findings are discussed in the framework of a qualitative model based on an approximation of local photoexcitation of the vanadium dimers from the insulating state.
Switching ultrastrong light–matter coupling on a subcycle scale
Creators: name: Huber, Rupert
name: Anappara, A. A.
name: Günter, G.
name: Sell, A.
name: De Liberato, S.
name: Ciuti, C.
name: Biasiol, G.
name: Sorba, L.
name: Tredicucci, A.
name: Leitenstorfer, A.
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: 530 Physik

description: Intersubband cavitypolaritons in a quantum wellwaveguide structure are optically generated within less than one cycle of light by a 12-femtosecond near-infrared pulse. Mid-infrared probe transients trace the nonadiabatic switch-on of ultrastrong light-matter coupling and the conversion of bare photons into cavitypolaritons directly in the time domain. Future perspectives of room-temperature subcycle control of ultrastrong electron–photon interaction are discussed.
Search for gamma-ray emission from magnetars with the Fermi Large Area Telescope
Creators: name: LAT Collaboration
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report on the search for 0.1-10 GeV emission from magnetars in 17 months of Fermi Large Area Telescope (LAT) observations. No significant evidence for gamma-ray emission from any of the currently-known magnetars is found. The most stringent upper limits to date on their persistent emission in the Fermi-LAT energy range are estimated between ~10^{-12}-10^{-10} erg/s/cm2, depending on the source. We also searched for gamma-ray pulsations and possible outbursts, also with no significant detection. The upper limits derived support the presence of a cut-off at an energy below a few MeV in the persistent emission of magnetars. They also show the likely need for a revision of current models of outer gap emission from strongly magnetized pulsars, which, in some realizations, predict detectable GeV emission from magnetars at flux levels exceeding the upper limits identified here using the Fermi-LAT observations.
description: ApJ Letters in press; Corresponding authors: Caliandro G. A., Hadasch D., Rea N., Burnett T
Absence of decoherence in the complex potential approach to nuclear scattering
Creators: name: Diaz-Torres, Alexis
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Time-dependent density-matrix propagation is used to demonstrate, in a schematic model of an open quantum system, that the complex potential approach and the Lindblad dissipative dynamics are \emph{not} equivalent. While the former preserves coherence, it is destroyed in the Lindblad dissipative dynamics. Quantum decoherence is the key aspect that makes the difference between the two approaches, indicating that the complex potential model is inadequate for a consistent description of open quantum-system dynamics. It is suggested that quantum decoherence should always be explicitly included when modelling low-energy nuclear collision dynamics within a truncated model space of reaction channels.
description: Accepted as a Rapid Communication in PRC
Nonperturbative Interband Response of a Bulk InSb Semiconductor Driven Off Resonantly by Terahertz Electromagnetic Few-Cycle Pulses
Creators: name: Junginger, F.
name: Mayer, B.
name: Schmidt, C.
name: Schubert, Olaf
name: Mährlein, S.
name: Leitenstorfer, A.
name: Huber, Rupert
name: Pashkin, Alexej
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik

description: Intense multiterahertz pulses are used to study the coherent nonlinear response of bulk InSb by means of field-resolved four-wave mixing spectroscopy. At amplitudes above 5 MV/cm the signals show a clear temporal substructure which is unexpected in perturbative nonlinear optics. Simulations based on a model of a two-level quantum system demonstrate that in spite of the strongly off-resonant character of the excitation the high-field few-cycle pulses drive the interband resonances into a nonperturbative regime of Rabi flopping. The rotating wave approximation breaks down in this case and the system reaches a complete population inversion.
Gibbsianness and non-Gibbsianness for Bernoulli lattice fields under removal of isolated sites
Creators: name: Jahnel, Benedikt
name: Külske, Christof
Publisher: name: Weierstrass Institute
Year: 2021
Subjects: subject: Gibbsianness
subject: Gibbs-uniqueness
subject: Bernoulli field
subject: local thinning
subject: two-layer representation
subject: Dobrushin uniqueness
subject: Peierls' argument
subject: 60D05
subject: 60K35
subject: 82B20

description: We consider the i.i.d. Bernoulli field μ p on Z d with occupation density p ∈ [0,1]. To each realization of the set of occupied sites we apply a thinning map that removes all occupied sites that are isolated in graph distance. We show that, while this map seems non-invasive for large p, as it changes only a small fraction p(1-p)2d of sites, there is p(d) <1 such that for all p ∈ (p(d), 1) the resulting measure is a non-Gibbsian measure, i.e., it does not possess a continuous version of its finite-volume conditional probabilities. On the other hand, for small p, the Gibbs property is preserved.
A Local-to-Global Result for Topological Spherical Buildings
Creators: name: McCallum, Rupert
Publisher: name: arXiv
Year: 2010
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 51H10

description: Suppose that Δ, Δ' are two buildings each arising from a semisimpe algebraic group over a field, a topological field in the former case, and that for both the buildings the Coxeter diagram has no isolated nodes. We give conditions under which a partially defined injective chamber map, whose domain is the subcomplex of Δ, generated by a nonempty open set of chambers, and whose codomain is Δ', is guaranteed to extend to a unique injective chamber map. Related to this result is a local version of the Borel-Tits theorem on abstract homomorphisms of simple algebraic groups.
Photo-Dember terahertz emitter excited with an Er:fiber laser
Creators: name: Klatt, G.
name: Surrer, B.
name: Stephan, D.
name: Schubert, Olaf
name: Fischer, M.
name: Faist, J.
name: Leitenstorfer, A.
name: Huber, Rupert
name: Dekorsy, T.
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: 530 Physik

description: A terahertz emitter based on the lateral photo-Dember effect is shown to efficiently generateterahertz radiation with a peak frequency of 0.7 THz and an electric field amplitude up to 5 V/cm when excited by 90 fs pulses centered at 1.55 μm. A thin layer of In0.53Ga0.47As grown on InP provides the substrate material in which unidirectional lateral photo-Dember currents are excited. Since photo-Dember terahertz emitters do not require an external bias, they do not suffer from high dark currents limiting the application of biased InGaAs photoconductive terahertz emitters.
EOSCpilot & LIBER Webinar: Ethical Issues & Skills in the European Open Science Cloud
Creators: name: Battaglia, Serena
name: Bishop, Elizabeth Lea
name: Sveinsdottir, Thordis
Publisher: name: Zenodo
Year: 2019
Subjects: EOSC, LIBER Europe, ethics, skills, data

description: The implications of ethics and private/sensitive data are often underappreciated and misunderstood. At the same time, the European Open Science Cloud requires both researchers and service providers to have a high degree of awareness and competence on these topics.

Policies covering ethical issues should not be an add-on but a key element of research practice from day one. Equally, appropriate support for dealing with ethical issues and research integrity in the EOSC should not be a box-ticking exercise, but an ongoing activity for researchers and infrastructure/service providers.

These slides are from a webinar (held Monday, 18 March at 1500 CET), during which these topics were discussed.

Webinar Aims

	To help Research Producing Organisations and Infrastructure staff who manage ethics processes (e.g., members of RECs, data protection officers, research leads) to better understand the implications for their work of EOSCpilot ethics recommendations;
	To identify the skills that researchers and data stewards need, in order to understand ethical risks in data stewardship and identify how these affect the application of FAIR principles;
	To help service providers to better understand ethical implications – particularly relating to GDPR – of providing services in EOSC.
Revealing the dark side of a bright exciton polariton condensate
Creators: name: Menard, Jean-Michel
name: Pöllmann, Christoph
name: Porer, Michael
name: Leierseder, Ursula
name: Galopin, E.
name: Lemaître, A.
name: Amo, A.
name: Bloch, J.
name: Huber, Rupert
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: Condensation of bosons causes spectacular phenomena such as superfluidity or superconductivity. Understanding the nature of the condensed particles is crucial for active control of such quantum phases. Fascinating possibilities emerge from condensates of light–matter-coupled excitations, such as exciton–polaritons, photons hybridized with hydrogen-like bound electron–hole pairs. So far, only the photon component has been resolved, while even the mere existence of excitons in the condensed regime has been challenged. Here we trace the matter component of polariton condensates by monitoring intra-excitonic terahertz transitions. We study how a reservoir of optically dark excitons forms and feeds the degenerate state. Unlike atomic gases, the atom-like transition in excitons is dramatically renormalized on macroscopic ground state population. Our results establish fundamental differences between polariton condensation and photon lasing and open possibilities for coherent control of condensates.
Orbifold Morse-Smale-Witten complex
Creators: name: Cho, Cheol-Hyun
name: Hong, Hansol
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Topology (math.AT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 57R18, 37D15

description: We construct Morse-Smale-Witten complex for an effective orientable orbifold. For a global quotient orbifold, we also construct a Morse-Bott complex. We show that certain type of critical points of a Morse function has to be discarded to construct such a complex, and gradient flows should be counted with suitable weights. The homology of these complexes are shown to be isomorphic to the singular homology of the quotient spaces under the self-indexing assumptions.
description: 35 pages, 6 figures; The content of the last section is replaced by the explanation on weak group actions. Some other minor changes
Nonadiabatic switching of a photonic band structure: Ultrastrong light-matter coupling and slow-down of light
Creators: name: Porer, Michael
name: Menard, Jean-Michel
name: Leitenstorfer, A.
name: Huber, Rupert
name: Del'Innocenti, R.
name: Zanotto, S.
name: Biasiol, B.
name: Sorba, L.
name: Tredicucci, A.
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik

description: We map out the band structure of a one-dimensional photonic crystal while a 12-fs control pulse activates ultrastrong interaction with quantized electronic transitions in semiconductor quantum wells. Phase-locked multi-terahertz transients trace the buildup of a large vacuum Rabi splitting and an unexpected asymmetric formation of the upper and lower polariton bands. The pronounced flattening of the photonic bands causes a slow-down of the group velocity by one order of magnitude on the time scale of the oscillation period of light.
Constructing Runge-Kutta Methods with the Use of Artificial Neural Networks
Creators: name: Anastassi, Angelos A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 68T05, 65L06

description: A methodology that can generate the optimal coefficients of a numerical method with the use of an artificial neural network is presented in this work. The network can be designed to produce a finite difference algorithm that solves a specific system of ordinary differential equations numerically. The case we are examining here concerns an explicit two-stage Runge-Kutta method for the numerical solution of the two-body problem. Following the implementation of the network, the latter is trained to obtain the optimal values for the coefficients of the Runge-Kutta method. The comparison of the new method to others that are well known in the literature proves its efficiency and demonstrates the capability of the network to provide efficient algorithms for specific problems.
description: The final publication is available at link.springer.com
Gravitational potential of a homogeneous circular torus: new approach
Creators: name: Bannikova, Elena Yu.
name: Vakulik, Victor G.
name: Shulga, Valery M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The integral expression for gravitational potential of a homogeneous circular torus composed of infinitely thin rings is obtained. Approximate expressions for torus potential in the outer and inner regions are found. In the outer region a torus potential is shown to be approximately equal to that of an infinitely thin ring of the same mass; it is valid up to the surface of the torus. It is shown in a first approximation, that the inner potential of the torus (inside a torus body) is a quadratic function of coordinates. The method of sewing together the inner and outer potentials is proposed. This method provided a continuous approximate solution for the potential and its derivatives, working throughout the region.
description: 10 pages, 9 figures, 1 table; some misprints in formulae were corrected
Sexual selection by female choice prevents speciation reversal in a hybridizing trio of mormyrid fish in southern Africa: evidence from playback experiments of electric organ discharges
Creators: name: Schmid, Daniela
name: Kramer, Bernd
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: male advertisement signals; choosy females; assortative mating; electrical communication
subject: 570 Biowissenschaften, Biologie
subject: 590 Tiere (Zoologie)

description: We studied the question of whether or not female choice among variant forms of species-specific male advertising signals, electric organ discharges (EODs), is a factor in preventing panmixy in a parapatric sibling complex of three species of mormyrid fish, inhabiting three parallel rivers in southern Africa. The three species’ EODs are characteristically differentiated in waveform. The Upper Zambezi River is inhabited by Pollimyrus marianne Kramer, van der Bank, Flint, Sauer-Gürth & Wink, 2003, the Okavango River by P. castelnaui (Boulenger, 1911), and the smaller Kwando River in their middle by P. cuandoensis Kramer, van der Bank & Wink, 2013, which is their hybrid species of unidirectional origin. P. castelnaui females (N=4 out of 5) and P. marianne females (N=5 of 5) responded stronger to playback of the EODs of male conspecifics compared to those of male P. cuandoensis. Pollimyrus castelnaui and P. marianne females neither preferred nor discriminated against the male EODs of each other’s species, respectively (one exception). The single P. cuandoensis female available preferred a P. marianne male EOD over one of its own species, and was neutral in all other tests. This suggests that female resistance in the two main system species to P. cuandoensis male EODs is an evolved one, effectively limiting hybridization to the Kwando. The females of the two main system species, P. castelnaui and P. marianne, thus prevent panmixy in the Okavango and the Zambezi, respectively, thereby keeping up the three-sibling species complex by discriminating female choice against P. cuandoensis males in the Okavango-Kwando-Zambezi system.
Uncertainty, regret, and psychological pain : why it hurts to be unsure
Creators: name: Benjamin, Rachele
Publisher: name: University of British Columbia
Year: 2017

description: Theorists have noted that social rejection, uncertainty, error evaluation, regret, and cognitive dissonance all activate the same neural substrate as physical pain; specifically, the anterior cingulate cortex (ACC). Furthermore, studies have shown that acetaminophen, a painkiller that is used to treat aches and pains, attenuates sensitivity to social pain, as well as uncertainty and dissonance. Together, these findings suggest that there is a relationship between physically and psychologically painful experiences. However, there is little evidence that various distinct sources of psychological distress increase sensitivity to physical pain, as we would expect given that they have a common neural basis. In study 1, I explored the hypothesis that psychological pain is physically painful by investigating purchases of over-the-counter painkillers. I found that Americans are more likely to purchase painkillers during uncertain times. In study 2, I investigated whether uncertainty leads to increased sensitivity to physical pain in a cold pressor task. Using this procedure, I was unable to find evidence that uncertainty increases sensitivity to physical pain. I suggest various alternative approaches to the study of pain and uncertainty. In study 3, I explored the relationship between physical pain and a new candidate for psychological pain: regret. I determined whether acetaminophen attenuates people’s experience of regret, a psychological experience that is conceptually similar to dissonance and error evaluation. I did not find evidence that acetaminophen attenuates people’s responses to regret. Therefore, I propose a number of future directions for the study of regret, uncertainty, and physical pain.
MPEC 2025-F247 : 2022 UJ5
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Connecting Students to Citizen Science and Curated Collections
Creators: name: Monfils, Anna
name: Krimmel, Erica
name: Linton, Debra
name: Marsico, Travis
name: Morris, Ashley
name: Ruhfel, Brad
Publisher: name: QUBES Educational Resources
Year: 2019

description: This educational module utilizes the traditional plant collection experience to engage students with biodiversity data protocols and resources available in our information-rich digital age.
Fast Color Quantization Using Weighted Sort-Means Clustering
Creators: name: Celebi, M. Emre
Publisher: name: arXiv
Year: 2010
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences
subject: I.4.1

description: Color quantization is an important operation with numerous applications in graphics and image processing. Most quantization methods are essentially based on data clustering algorithms. However, despite its popularity as a general purpose clustering algorithm, k-means has not received much respect in the color quantization literature because of its high computational requirements and sensitivity to initialization. In this paper, a fast color quantization method based on k-means is presented. The method involves several modifications to the conventional (batch) k-means algorithm including data reduction, sample weighting, and the use of triangle inequality to speed up the nearest neighbor search. Experiments on a diverse set of images demonstrate that, with the proposed modifications, k-means becomes very competitive with state-of-the-art color quantization methods in terms of both effectiveness and efficiency.
description: 30 pages, 2 figures, 4 tables
Drinfeld $A$-quasi-modular forms
Creators: name: Bosser, Vincent
name: Pellarin, Federico
Publisher: name: arXiv
Year: 2010
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: The aim of this article is twofold: first, improve the multiplicity estimate obtained by the second author for Drinfeld quasi-modular forms; and then, study the structure of certain algebras of "almost-$A$-quasi-modular forms"
Origin and effect of In–Sn ordering in InSnCo3S2: a neutron diffraction and DFT study
Creators: name: Rothballer, Jan
name: Bachhuber, Frederik
name: Rommel, S.
name: Soehnel, Tilo
name: Weihrich, Richard
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: The solid solution In2−xSnxCo3S2 is attractive due to a variety of interesting properties depending on the In/Sn content, i.e. half metal ferromagnetic Sn2Co3S2, low dimensional metal In2Co3S2, and semiconducting thermoelectric InSnCo3S2. For the latter, crystal structure effects and a metal to insulator transition are not only related to electron counting but also to ordering of In and Sn within and between Co Kagomé nets. These observations have not been adequately understood to date. The degree of ordering is now evaluated from neutron diffraction data to distinguish In and Sn. The origin and effects on crystal and electronic structures are studied by DFT calculations on a superstructure model. Relations of local bonding (electron localization function ELF and Bader's AIM theory), In/Sn site preference, crystal structure distortions, and the opening of the gap are explored. Results are generalised from predictions on isoelectronic compounds.
description: Open-Access-Komponente aus der Allianzlizenz
Four Equivalent Versions of Non-Abelian Gerbes
Creators: name: Nikolaus, Thomas
name: Waldorf, Konrad
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: Primary 55R65, Secondary 53C08, 55N05, 22A22

description: We recall and partially improve four versions of smooth, non-abelian gerbes: Cech cocycles, classifying maps, bundle gerbes, and principal 2-bundles. We prove that all these four versions are equivalent, and so establish new relations between interesting recent developments. Prominent partial results we prove are a bijection between continuous and smooth non-abelian cohomology, and an explicit equivalence between bundle gerbes and principal 2-bundles as 2-stacks.
description: 65 pages, v2: minor corrections, new Corollary 7.2 about equivariant gerbes; v3: again minor corrections; v3 is the final and published version
Unraveling the chromophoric disorder of poly(3-hexylthiophene)
Creators: name: Thiessen, Alexander
name: Vogelsang, Jan
name: Adachi, Takuji
name: Steiner, Florian
name: Vanden Bout, David
name: Lupton, John M.
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: structure-property relations; conformational disorder; photophysics; organic solar cells; SINGLE-MOLECULE SPECTROSCOPY; CONJUGATED POLYMER-MOLECULES; ENERGY-TRANSFER; SOLAR-CELLS; CHAIN CONFORMATION; CHARGE-TRANSPORT; POLYTHIOPHENE; MORPHOLOGY; FILMS; EMISSION
subject: 530 Physik

description: The spectral breadth of conjugated polymers gives these materials a clear advantage over other molecular compounds for organic photovoltaic applications and is a key factor in recent efficiencies topping 10%. However, why do excitonic transitions, which are inherently narrow, lead to absorption over such a broad range of wavelengths in the first place? Using single-molecule spectroscopy, we address this fundamental question in a model material, poly(3-hexylthiophene). Narrow zero-phonon lines from single chromophores are found to scatter over 200 nm, an unprecedented inhomogeneous broadening that maps the ensemble. The giant red shift between solution and bulk films arises from energy transfer to the lowest-energy chromophores in collapsed polymer chains that adopt a highly ordered morphology. We propose that the extreme energetic disorder of chromophores is structural in origin. This structural disorder on the single-chromophore level may actually enable the high degree of polymer chain ordering found in bulk films: both structural order and disorder are crucial to materials physics in devices.
Signatures of spin-preserving symmetries in two-dimensional hole gases
Creators: name: Dollinger, Tobias
name: Kammermeier, Michael
name: Scholz, Andreas
name: Wenk, Paul
name: Schliemann, John
name: Winkler, R.
name: Richter, Klaus
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: We investigate ramifications of the persistent spin helix symmetry in two-dimensional hole gases in the conductance of disordered mesoscopic systems. To this end we extend previous models by going beyond the axial approximation for III-V semiconductors. For heavy-hole subbands we identify an exact spin-preserving symmetry analogous to the electronic case by analyzing the crossover from weak antilocalization to weak localization and spin transmission as a function of extrinsic spin-orbit interaction strength.
A change in perspective – Teacher education as an open system
Creators: name: König, Christoph
name: Mulder, Regina H.
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: teacher selection; teacher allocation; teacher education effectiveness; open system; positive matching
subject: 150 Psychologie

description: Teacher education is the environment for the learning and instruction of prospective teachers. Its structure, components, and contents shape the development of relevant competences which enable prospective teachers to be effective in the classroom. But its relevance is questioned because respective research, characterised by inconclusive results, does not offer explanations about the reasons why certain teacher education programmes are more effective than others in the development of relevant competences. One reason for the lack of explanations can be found in the way research assesses the effectiveness of teacher education. This might be due to problems regarding the conceptualisations of teacher education, as well as to the inherent selection and non-random allocation problems in research on the relation between teacher education and student achievement. In this paper we respond to claims for an organisational perspective on teacher education and develop such a new perspective. Accordingly, we provide these claims with an adequate theoretical foundation and develop an organisational model of teacher education based on Open Systems Theory. Besides being one of the first integrative organisational models of teacher education, it is among the first models which illustrate the relations and interdependencies of systems, its different parts, and its different levels, and enables researchers to investigate these interdependencies. The development of this model is further based on an alteration of the input variables of the concept of teacher quality. Moreover, the model has consequences for the notion of teacher education effectiveness. We illustrate these changes, and discuss them and the model with respect to possible areas of further research.