cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Aharonov-Bohm effect and geometric phases -- Exact and approximate topology
Creators: name: Fujikawa, Kazuo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: By analyzing an exactly solvable model in the second quantized formulation which allows a unified treatment of adiabatic and non-adiabatic geometric phases, it is shown that the topology of the adiabatic Berry's phase, which is characterized by the singularity associated with possible level crossing, is trivial in a precise sense. This topology of the geometric phase is quite different from the topology of the Aharonov-Bohm effect, where the topology is specified by the external local gauge field and it is exact for the slow as well as for the fast motion of the electron.
description: 6 pages. Invited talk given at Tonomura FIRST International Symposium on Electron Microscopy and Gauge Fields, May 9-10, 2012, Tokyo, Japan
Stellar Populations in the Central 0.5 pc of the Galaxy I: A New Method for Constructing Luminosity Functions and Surface-Density Profiles
Creators: name: Do, Tuan
name: Lu, Jessica R.
name: Ghez, Andrea M.
name: Morris, Mark R.
name: Yelda, Sylvana
name: Martinez, Gregory D.
name: Wright, Shelley A.
name: Matthews, Keith
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new high angular resolution near-infrared spectroscopic observations of the nuclear star cluster surrounding the Milky Way's central supermassive black hole. Using the integral-field spectrograph OSIRIS on Keck II behind the laser-guide-star adaptive optics system, this spectroscopic survey enables us to separate early-type (young, 4-6 Myr) and late-type (old, >1 Gyr) stars with a completeness of 50% down to K' = 15.5 mag, which corresponds to ~10 \msun for the early-type stars. This work increases the radial extent of reported OSIRIS/Keck measurements by more than a factor of 3 from 4" to 14" (0.16 pc to 0.56 pc), along the projected disk of young stars. For our analysis, we implement a new method of completeness correction using a combination of star-planting simulations and Bayesian inference. We assign probabilities for the spectral type of every source detected in deep imaging down to K' = 15.5 mag using information from spectra, simulations, number counts, and the distribution of stars. The inferred radial surface-density profiles, $Σ(R) \propto R^{-Γ}$, for the young stars and late-type giants are consistent with earlier results ($Γ_{early} = 0.93 \pm 0.09$, $Γ_{late} = 0.16 \pm 0.07$). The late-type surface-density profile is approximately flat out to the edge of the survey. While the late-type stellar luminosity function is consistent with the Galactic bulge, the completeness-corrected luminosity function of the early-type stars has significantly more young stars at faint magnitudes compared to previous surveys with similar depth. This luminosity function indicates that the corresponding mass function of the young stars is likely less top-heavy than that inferred from previous surveys.
description: accepted to ApJ
Event management for large scale event-driven digital hardware spiking neural networks
Creators: name: Caron, Louis-Charles
name: D'Haene, \and Michiel
name: Mailhot, \and Frédéric
name: Schrauwen, \and Benjamin
name: Rouat, \and Jean
Publisher: name: arXiv
Year: 2013
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The interest in brain-like computation has led to the design of a plethora of innovative neuromorphic systems. Individually, spiking neural networks (SNNs), event-driven simulation and digital hardware neuromorphic systems get a lot of attention. Despite the popularity of event-driven SNNs in software, very few digital hardware architectures are found. This is because existing hardware solutions for event management scale badly with the number of events. This paper introduces the structured heap queue, a pipelined digital hardware data structure, and demonstrates its suitability for event management. The structured heap queue scales gracefully with the number of events, allowing the efficient implementation of large scale digital hardware event-driven SNNs. The scaling is linear for memory, logarithmic for logic resources and constant for processing time. The use of the structured heap queue is demonstrated on field-programmable gate array (FPGA) with an image segmentation experiment and a SNN of 65~536 neurons and 513~184 synapses. Events can be processed at the rate of 1 every 7 clock cycles and a 406$\times$158 pixel image is segmented in 200 ms.
FORMATION OF READING AND LISTENING COMPREHENSION COMPETENCE OF ELEMENTARY SCHOOL STUDENTS
Creators: name: Abdullaeva, Mavluda
Publisher: name: Zenodo
Year: 2023

description: This article analyzes the criteria for assessing students' reading literacy. In particular, there are international programs PIRLS (International Reading and Comprehension Survey), which determines the quality, level and level of education in the world, and they are widely used as a criterion for further improving the quality of education in developed countries. referred to.
Starlikeness problems for certain analytic functions concerned with subordinations
Creators: name: Shiraishi, Hitoshi
name: Owa, Shigeyoshi
name: Hayami, Toshio
name: Kuroki, Kazuo
name: Srivastava, H. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30C45

description: Let A_n be the class of functions f(z) which are analytic in the open unit disk U} with f(0)=0, f'(0)=1, f"(0)=f"'(0)=...=f^{(n)}=0 and f^{(n+1)}\neq0. Applying the results due to S. S. Miller (J. Math. Anal. Appl. 65(1978), 289-305), some interesting starlikeness problems concerned with subordinations are discussed. The results in the paper are extensions of results by M. Obradović (Hokkaido Math. J. 27(1998), 329-335).
Design of Experiments for Calibration of Planar Anthropomorphic Manipulators
Creators: name: Klimchik, Alexandr
name: Wu, Yier
name: Caro, Stéphane
name: Pashkevich, Anatol
Publisher: name: arXiv
Year: 2012
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The paper presents a novel technique for the design of optimal calibration experiments for a planar anthropomorphic manipulator with n degrees of freedom. Proposed approach for selection of manipulator configurations allows essentially improving calibration accuracy and reducing parameter identification errors. The results are illustrated by application examples that deal with typical anthropomorphic manipulators.
description: Advanced Intelligent Mechatronics (AIM), 2011 IEEE/ASME International Conference on, Budapest : Hungary (2011)
Stellar Populations in the Central 0.5 pc of the Galaxy II: The Initial Mass Function
Creators: name: Lu, Jessica R.
name: Do, Tuan
name: Ghez, Andrea M.
name: Morris, Mark R.
name: Yelda, Sylvana
name: Matthews, Keith
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The supermassive black hole at the center of the Milky Way plays host to a massive, young cluster that may have formed in one of the most inhospitable environments in the Galaxy. We present new measurements of the global properties of this cluster, including the initial mass function (IMF), age, and cluster mass. These results are based on Keck laser-guide-star adaptive optics observations used to identify the young stars and measure their Kp-band luminosity function as presented in Do et al. 2013. A Bayesian inference methodology is developed to simultaneously fit the global properties of the cluster utilizing the observations and extensive simulations of synthetic star clusters. We find that the slope of the mass function for this cluster is α= 1.7 +/- 0.2, which is steeper than previously reported, but still flatter than the traditional Salpeter slope of 2.35. The age of the cluster is between 2.5-5.8 Myr with 95% confidence, which is a younger age than typically adopted but consistent within the uncertainties of past measurements. The exact age of the cluster is difficult to determine since our results show two distinct age solutions (3.9 Myr and 2.8 Myr) due to model degeneracies in the relative number of Wolf-Rayet and OB stars. The total cluster mass is between 14,000 - 37,000 \msun above 1 \msun and it is necessary to include multiple star systems in order to fit the observed luminosity function and the number of observed Wolf-Rayet stars. The new IMF slope measurement is now consistent with X-ray observations indicating a factor of 10 fewer X-ray emitting pre-main-sequence stars than expected when compared with a Salpeter IMF. The young cluster at the Galactic center is one of the few definitive examples of an IMF that deviates significantly from the near-universal IMFs found in the solar neighborhood.
description: accepted to ApJ
On the rotational energy distributions of reactive, non-polar species in the interstellar medium
Creators: name: Glinski, Robert J.
name: Hoy, Erik P.
name: Downum, Clark R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A basic model for the formation of non-equilibrium rotational energy distributions is described for reactive, homo-polar diatomic molecules and ions in the interstellar medium. Kinetic models were constructed to calculate the rotational populations of C2+ under the conditions it would experience in the diffuse interstellar medium. As the non-polar ion reacts with molecular hydrogen, but not atomic hydrogen, the thermalization of a hot nascent rotational population will be arrested by chemical reaction when the H2 density begins to be significant. Populations that deviate strongly from the local thermodynamic equilibrium are predicted for C2+ in environments where it may be detectable. Consequences of this are discussed and a new optical spectrum is calculated.
Azimuthal Density Variations Around the Rim of Tycho's Supernova Remnant
Creators: name: Williams, Brian J.
name: Borkowski, Kazimierz J.
name: Ghavamian, Parviz
name: Hewitt, John W.
name: Mao, S. Alwin
name: Petre, Robert
name: Reynolds, Stephen P.
name: Blondin, John M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: {\it Spitzer} images of Tycho's supernova remnant in the mid-infrared reveal limb-brightened emission from the entire periphery of the shell and faint filamentary structures in the interior. As with other young remnants, this emission is produced by dust grains, warmed to $\sim 100$ K in the post-shock environment by collisions with energetic electrons and ions. The ratio of the 70 to 24 $μ$m fluxes is a diagnostic of the dust temperature, which in turn is a sensitive function of the plasma density. We find significant variations in the 70/24 flux ratio around the periphery of Tycho's forward shock, implying order-of-magnitude variations in density. While some of these are likely localized interactions with dense clumps of the interstellar medium, we find an overall gradient in the ambient density surrounding Tycho, with densities 3-10 times higher in the NE than in the SW. This large density gradient is qualitatively consistent with the variations in the proper motion of the shock observed in radio and X-ray studies. Overall, the mean ISM density around Tycho is quite low ($\sim 0.1-0.2$ cm$^{-3}$), consistent with the lack of thermal X-ray emission observed at the forward shock. We perform two-dimensional hydrodynamic simulations of a Type Ia SN expanding into a density gradient in the ISM, and find that the overall round shape of the remnant is still easily acheivable, even for explosions into significant gradients. However, this leads to an offset of the center of the explosion from the geometric center of the remnant of up to 20%, although lower values of 10% are preferred. The best match with hydrodynamical simulations is achieved if Tycho is located at a large (3-4 kpc) distance in a medium with a mean preshock density of $\sim 0.2$ cm$^{-3}$. Such preshock densities are obtained for highly ($\ga 50$%) porous ISM grains.
description: Accepted for publication in ApJ. Manuscript format, 40 pages, 5 figures
The 21-cm signature of the first stars during the Lyman-Werner feedback era
Creators: name: Fialkov, Anastasia
name: Barkana, Rennan
name: Visbal, Eli
name: Tseliakhovich, Dmitriy
name: Hirata, Christopher M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The formation of the first stars is an exciting frontier area in astronomy. Early redshifts z ~ 20 have become observationally promising as a result of a recently recognized effect of a supersonic relative velocity between the dark matter and gas. This effect produces prominent structure on 100 comoving Mpc scales, which makes it much more feasible to detect 21-cm fluctuations from the epoch of first heating. We use semi-numerical hybrid methods to follow for the first time the joint evolution of the X-ray and Lyman-Werner radiative backgrounds, including the effect of the supersonic streaming velocity on the cosmic distribution of stars. We incorporate self-consistently the negative feedback on star formation induced by the Lyman-Werner radiation, which dissociates molecular hydrogen and thus suppresses gas cooling. We find that the feedback delays the X-ray heating transition by a Delta z ~ 2, but leaves a promisingly large fluctuation signal over a broad redshift range. The large-scale power spectrum is predicted to reach a maximal signal-to-noise ratio of S/N ~ 3-4 at z ~ 18 (for a projected first-generation instrument), with S/N > 1 out to z ~ 22-23. We hope to stimulate additional numerical simulations as well as observational efforts focused on the epoch prior to cosmic reionization.
description: MNRAS submitted
Sufficient conditions for strongly Carathéodory functions
Creators: name: Shiraishi, Hitoshi
name: Owa, Shigeyoshi
name: Srivastava, H. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30C45

description: Applying the subordination principle for analytic functions in the open unit disk U, I. H. Kim and N. E. Cho (Comput. Math. Appl. 59(2010), 2067-2073) considered some sufficient conditions for Carathéodory functions. The purpose of this paper is to discuss some sufficient conditions for the class of strongly Carathéodory functions in U.
Estimating coupling directions in the cardio-respiratory system using recurrence properties
Creators: name: Marwan, Norbert
name: Zou, Yong
name: Wessel, Niels
name: Riedl, Maik
name: Kurths, Jürgen
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The asymmetry of coupling between complex systems can be studied by conditional probabilities of recurrence, which can be estimated by joint recurrence plots. This approach is applied for the first time on experimental data: time series of the human cardio-respiratory system in order to investigate the couplings between heart rate, mean arterial blood pressure, and respiration. We find that the respiratory system couples towards the heart rate and the heart rate towards the mean arterial blood pressure. However, our analysis could not detect a clear coupling direction between the mean arterial blood pressure and respiration.
A Search for Photometric Variability in L and T type Brown Dwarf Atmospheres
Creators: name: Khandrika, Harish
name: Burgasser, Adam
name: Melis, Carl
name: Luk, Christopher
name: Bowsher, Emily
name: Swift, Brandon
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using the Gemini infrared camera on the 3-meter Shane telescope at Lick Observatory, we have searched for broad-band J and K' photometric variability for a sample of 15 L and T-type brown dwarfs, including 7 suspected spectral binaries. Four of the dwarfs - 2MASS J0939-2448, 2MASS J1416+1348A, 2MASS J1711+2232, and 2MASS J2139+0220 - exhibit statistically significant variations over timescales ranging from ~0.5 hr to 6 days. Our detection of variability in 2MASS J2139+0220 confirms that reported by Radigan et al., and periodogram and phase dispersion minimization analysis also confirms a variability period of approximately 7.6 +/- 0.2 hours. Remarkably, two of the four variables are known or candidate binary systems, including 2MASS J2139+0220, for which we find only marginal evidence of radial velocity variation over the course of a year. This result suggests that some spectral binary candidates may appear as such due to the blending of cloudy and non-cloudy regions in a single "patchy" atmosphere. Our results are consistent with an overall variability fraction of 35 +/- 5 %, with no clear evidence of greater variability among brown dwarfs at the L dwarf/T dwarf transition.
Liquid meniscus friction on a wet plate: Bubbles, lamellae and foams
Creators: name: Cantat, Isabelle
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Many microfluidics devices, coating processes or diphasic flows involve the motion of a liquid meniscus on a wet wall. This motion induces a specific viscous force, that exhibits a non-linear dependency in the meniscus velocity. We propose a review of the theoretical and experimental work made on this viscous force, for simple interfacial properties. The interface is indeed assumed either perfectly compressible (mobile interface) or perfectly incompressible (rigid interface). We show that, in the second case, the viscous force exerted by the wall on the meniscus is a combination of two power laws, scaling like $Ca^{1/3}$ and $Ca^{2/3}$, with $Ca$ the capillary number. We provide a prediction for the stress exerted on a foam sliding on a wet solid and compare it with experimental data, for the incompressible case.
Digitale Jugendarbeit in städtischen Kontexten der Deutschschweiz: Analyse aktueller «Best Practices» und Generierung einer Handreichung zur Implementierung
Creators: name: Portmann, Andrea
Publisher: name: Zenodo
Year: 2023

description: Will die Offene Jugendarbeit (OJA) ihrem Auftrag gerecht werden und Jugendliche in ihrem Aufwachsen in einer mediatisierten Welt begleiten, muss sie sich aktualisieren und beginnen, das gesamte Potenzial freizusetzen, das digitale Medien für den Einsatz in der OJA bergen. Deshalb hat sich Andrea Portmann im Rahmen ihrer Bachelorarbeit mit digitaler Jugendarbeit (dJA) in städtischen Kontexten der Deutschschweiz befasst. Auf theoretischer Ebene wurde untersucht, wie die digitale Transformation das Praxisfeld der OJA verändert, was unter dJA verstanden wird und welche Erkenntnisse im Hinblick auf die Implementierung von dJA in der Schweiz bereits vorliegen. Nach einem Perspektivenabgleich mit der europäischen Union hat sich gezeigt, dass dJA mit Blick auf Forschung und Praxis hierzulande hinterherhinkt. In der Folge wurden sechs Expert*innen-Interviews mit Jugendarbeiter*innen geführt, welche in Deutschschweizer Städten bereits dJA umsetzen und mittels Gatekeeper-Verfahren als «Best Practices» in die Stichprobe gelangt sind. Die qualitative Forschungsanlage sollte Aufschluss darüber geben, wie sich gelingende dJA in städtischen Kontexten der Deutschschweiz äussert und welche (übergeordneten) Faktoren Fachpersonen hinsichtlich der Implementierung von dJA als förderlich erachten. Mit den Erkenntnissen aus Theorie und Praxis konnten zwei Handreichungen für die Praxis entwickelt werden, welche mögliche Umsetzungsstrategien zur nachhaltigen Professionalisierung von dJA zeigen. Während das 8-Check-Modell zur Implementierung von dJA Fachpersonen im Feld einen möglichen Einstieg zeigt, richten sich die Handlungsempfehlungen an alle relevanten Akteur*innen am Prozess.
description: + Code Diss LU: hslusa bask be + Fussnote: Bachelor-Arbeit, Hochschule Luzern – Soziale Arbeit, Studienrichtung Soziokultur, 2023 + NL-Code: NLLUHSA202303
Enhancement of level-crossing resonances in rubidium atoms by frequency control of the exciting radiation field
Creators: name: Auzinsh, Marcis
name: Berzins, Andris
name: Ferber, Ruvin
name: Gahbauer, Florian
name: Kalvans, Linards
name: Mozers, Arturs
name: Spiss, Agris
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We studied magneto-optical resonances caused by excited-state level crossings in a nonzero magnetic field. Experimental measurements were performed on the transitions of the $D_2$ line of rubidium. These measured signals were described by a theoretical model that takes into account all neighboring hyperfine transitions, the mixing of magnetic sublevels in an external magnetic field, the coherence properties of the exciting laser radiation, and the Doppler effect. Good agreement between the experimental measurements and the theoretical model could be achieved over a wide range of laser power densities. We further showed that the contrasts of the level-crossing peaks can be sensitive to changes in the frequency of the exciting laser radiation as small as several tens of megahertz when the hyperfine splitting of the exciting state is larger than the Doppler broadening.
description: 10 pages, 10 figures
title: Facebook as a Tool Aiding University Education - Whether it is Possible and Useful
Creators: name: Valova, Irena
name: Marinov, Milko
Publisher: name: TEM Journal
Year: 2019

description: The paper describes our experience with using social networks and especially Facebook as a learning environment. During the last five years we have collected statistical data from surveys with all students of our courses. The survey results show that the use of Facebook group improves learning process by extending the communication outside classes and helps students increase their interest and motivation. Most of the students are satisfied. They have better results and achieve more than they expected. There are more inconveniences for the lecturers, because they have to re-publish their materials (for each group) and follow the discussions in all groups.
title: How do Prospective Teachers Manage Students’ Learning of Mathematics?
Creators: name: Eko Siswono, Tatag Yuli
name: Hartono, Sugi
name: Wachidul Kohar, Ahmad
name: Karim, Karim
name: Lastiningsih, Netti
Publisher: name: TEM Journal
Year: 2019

description: This article describes the preferences of a prospective teacher on the management of learning mathematics in the classroom. This descriptive research involves nine prospective elementary teachers at a state university in Indonesia. Data were collected through the task of designing learning scenarios that included a variety of student ability options. Results show that they prefer to apply problem-based learning and cooperative learning and selecting choices of learning approaches mainly based on the level of student mathematical ability, instead of gender and motivation. As a suggestion, prospective teachers need to be given skills to make argumentative decisions in deciding the appropriate learning approaches.
Non-Hermitian shortcut to adiabaticity
Creators: name: Torosov, Boyan T.
name: Della Valle, Giuseppe
name: Longhi, Stefano
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A non-Hermitian shortcut to adiabaticity is introduced. By adding an imaginary term in the diagonal elements of the Hamiltonian of a two state quantum system, we show how one can cancel the nonadiabatic losses and perform an arbitrarily fast population transfer, without the need to increase the coupling. We apply this technique to two popular level-crossing models: the Landau-Zener model and the Allen-Eberly model.
description: 5 pages, 3 figures
title: Accounting Experiential Learning Firm (AELF): Learning Accounting in an Office Setting
Creators: name: Roziani , Ali
name: W M Nori, W M Nazif
name: Baharudin, Ithnahaini
Publisher: name: TEM Journal
Year: 2019

description: Accounting subject is a dull and difficult subject to learn. Combining real source documents, practitioner’s advices, lecturer supervisions, office setting and accounting software, Accounting Experiential Learning Firm (AELF) is set up to answer the call for more experiential learning which could help the accounting students to understand accounting subject better. Moving from classroom boredom to a more practical office setting, AELF aim to increase student understanding and also interest in accounting subject and the profession. This article describes details of the AELF project and reports the feedbacks from students.
$^2$H$(e,e'p)$ observables using a Regge model parameterization of final state interactions
Creators: name: Ford, William P.
name: Jeschonnek, Sabine
name: Van Orden, J. W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: In previous papers we have presented a calculation describing electrodisintegration of the deuteron at GeV energies. The model is fully relativistic and incorporates full spin dependence of the final state interactions (FSI), which were obtained from the SAID analysis. It was, however, limited kinematically due to lack of availability of the SAID amplitudes. This work rectifies this problem by implementing a Regge model to describe the FSI. We present an outline of the model and show comparisons between the two approaches in a region of overlap. We see good agreement between the models, and note observables which can provide additional insight due to model sensitivity.
STILT: System Design & Performance
Creators: name: Mawson, N. R.
name: Steele, I. A.
name: Smith, R. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Small Telescopes Installed at the Liverpool Telescope (STILT) have been in operation since March 2009, collecting wide field data from their position, mounted to the Liverpool Telescope. The two instruments; SkycamT and SkycamZ have been used to create a variability search of the skies visible at La Palma with the limits of 12th and 18th R band magnitude with fields of view of 21x21 and 1x1 degrees. We provide here a description of the hardware and software setup and the performance of the system to date.
description: 10 Pages, 13 figures. Accepted for publication in AN
title: Plankton lifeform traits master list (v3)
Creators: name: UK Pelagic Habitats Expert Group, UK Pelagic Habitats Expert Group
Publisher: name: The Archive for Marine Species and Habitats Data (DASSH)
Year: 2019

description: Indicators based on plankton functional groups, or lifeforms, can be used to reveal plankton community responses to factors such as nutrient loading from humans and climate-driven change. Changes in the relative abundance between ecologically-relevant lifeform pairs can indicate changes to key aspects of ecosystem functioning, for example, links between the water column and sea floor, ecosystem energy flows and pathways, and food web interactions. This database was created for the UK and OSPAR MSFD assessments and consists of plankton species, trait, and lifeform data for multiple Northeast Atlantic datasets. It is a living database and will evolve as more datasets, and species, are added.
Composite stimulated Raman adiabatic passage
Creators: name: Torosov, Boyan T.
name: Vitanov, Nikolay V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a high-fidelity technique for coherent control of three-state quantum systems, which combines two popular control tools --- stimulated Raman adiabatic passage (STIRAP) and composite pulses. By using composite sequences of pairs of partly delayed pulses with appropriate phases the nonadiabatic transitions, which prevent STIRAP from reaching unit fidelity, can be canceled to an arbitrary order by destructive interference, and therefore the technique can be made arbitrarily accurate. The composite phases are given by simple analytic formulas, and they are universal for they do not depend on the specific pulse shapes, the pulse delay and the pulse areas.
description: 5 pages, 5 figures
Quantum correlations of two-mode Gaussian systems in a thermal environment
Creators: name: Isar, Aurelian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, we give a description of continuous variable quantum entanglement and quantum discord for a system consisting of two non-interacting non-resonant bosonic modes embedded in a thermal environment. We study the time evolution of logarithmic negativity, which characterizes the degree of entanglement, and show that in the case of an entangled initial squeezed thermal state, entanglement suppression takes place for all temperatures of the environment, including zero temperature. We analyze the time evolution of the Gaussian quantum discord, which is a measure of all quantum correlations in the bipartite state, including entanglement, and show that discord decays asymptotically in time under the effect of the thermal bath. We describe also the time evolution of classical correlations and quantum mutual information, which measures the total correlations of the quantum system.
description: 10 pages, 4 figures, Physica Scripta, Topical Issue (2013). Contribution at the 19th Central European Workshop on Quantum Optics (CEWQO-2012), Sinaia, Romania (2012). Extended version of arXiv:1301.0146 from quantum correlations of symmetric Gaussian states to mutual information, quantum and classical correlations of non-symmetric Gaussian states
title: Η Βιομιμητική και οι εφαρμογές της στους ευρύτερους τομείς της μηχανικής

title: Biomimicry and its applications on the field of engineering
Creators: name: Καρανικολας Κωνσταντινος
Publisher: name: Technical University of Crete
Year: 2022

description: Η παρούσα εργασία θα μελετήσει τους βασικούς τρόπους βιομιμητικού σχεδιασμού και καθορισμένες εφαρμογές της βιομιμητικής. Οι προς μελέτη εφαρμογές αφορούν τη βιομιμητική σχεδίαση αυτόνομων μη- επανδρωμένων υποβρύχιων σκαφών, τη δημιουργία αλγορίθμων βελτιστοποίησης δικτύων βάσει της συμπεριφοράς του Physarum Polycephalum και τη δημιουργία  εμφυτευμάτων βασισμένων στη σύσταση των ίδιων των οστών.  Θα αναλύσει τα πλεονεκτήματα και μειονεκτήματα των εφαρμογών αυτών, καθώς και τη σημασία της για την επιστήμη της Μηχανικής και των επιστημών στο άμεσο μέλλον.
Zero-point fluctuations in rotation: Perpetuum mobile of the fourth kind without energy transfer
Creators: name: Chernodub, M. N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss a simple Casimir-type device for which the rotational energy reaches its global minimum when the device rotates about a certain axis rather than remains static. This unusual property is a direct consequence of the fact that the moment of inertia of zero-point vacuum fluctuations is a negative quantity (the rotational vacuum effect). Moreover, the device does not produce any work despite the fact that its equilibrium ground state corresponds to a permanent rotation. Counterintuitively, the device has no internally moving mechanical parts while its very existence is consistent with the laws of thermodynamics. We point out that such devices may possibly be constructed using carbon nanotubes. We call this "zero-point-driven" device as the perpetuum mobile of the fourth kind.
description: 11 pages, 3 figures; talk given at the workshop "Mathematical Structures in Quantum Systems and applications", 08 - 14 July, 2012, Benasque, Spain
The Contestation Café - Prototyping An Agonistic Space
Creators: name: Collins, Robert
Publisher: name: Zenodo
Year: 2022
Subjects: contestability
design
algorithms
repair
agonism
Agonistic Design

description: Presentation of the Contestation Café speculative artefact and paper at NordiCHI 2022 in Aarhus Universitet. The Contestation Manifesto and its associated paraphernalia are artefacts from a speculative, near-future community action known as the Contestation Café. Being one in a series of research through design projects on contestation, the Contestation Café is a critical, yet also practical, design intervention rooted in how the act of repair has moved through the physical into the digital, and the shared values therein. Tracing the history of electronic repair - from the early valve radios, the invention of the transistor, microchips, programmable devices and through to IoT, connected devices and the “fluid assemblages” that emerge - we can see the shared values of the physical act of repair with the more intangible act of contestation in the digital world of algorithmic systems. Overlaying the values and tactics of the Right to Repair movement with the emerging concerns around data-driven systems we find ourselves examining the Repair Café as a potential model for community contestation and the construction of publics. The Repair Café started in Amsterdam in 2009 and has since spread to 35 countries with over 1700 instances of these cafés. The Repair Café is not intended to be a place where you bring your broken appliances for someone else to repair - rather, it is a place where you learn how to repair and recycle your own products and devices, and - more importantly - a place where you simply learn that things can be fixed rather than thrown out. In a similar spirit, the Contestation Café would be a place for those who feel mistreated by automated decision systems, AIs and algorithms, to bring their broken interactions and their unfair decisions to learn how to contest, push back and reclaim their agency and autonomy. Rather than Repairers, the Contestation Café has a panel of Fixers - people who inhabit the space between designers and users, with a particular knowledge of these systems and how to map and navigate them - who are there to share their experience and knowledge, and to guide the user in the ways of contestation and to become Fixers of their own futures. Although the Contestation Café is a speculative concept based on research into the shared values of contestation and repair, it has developed a life of its own through the process of imagining how it would work and what it would look like. Through the act of writing a manifesto for contestation, the space has manifested itself in the present and is waiting only for the fixers and public to arrive. Plans are already in progress for its first real instance and all of the imagined artefacts presented here will inform this process. https://contestationcafe.org/
On multi-dimensional sampling and interpolation
Creators: name: Olevskii, Alexander
name: Ulanovskii, Alexander
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 42C15, 41A05

description: The paper discusses sharp sufficient conditions for interpolation and sampling for functions of n variables with convex spectrum. When n=1, the classical theorems of Ingham and Beurling state that the critical values in the estimates from above (from below) for the distances between interpolation (sampling) nodes are the same. This is no longer true for n>1. While the critical value for sampling sets remains constant, the one for interpolation grows linearly with the dimension.
3He-rich SEP Events Observed by STEREO-A
Creators: name: Bucik, R.
name: Mall, U.
name: Korth, A.
name: Mason, G. M.
name: Gomez-Herrero, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using the SIT (Suprathermal Ion Telescope) instrument on STEREO-A we have examined the abundance of the rare isotope 3He during the rising activity phase of solar cycle 24 between January 2010 and December 2011. We have identified six solar energetic particle (SEP) events with enormous abundance enhancements of 3He (3He/4He >1). The events were short lasting, typically ~0.5-1 day and most of them occurred in association with high-speed solar wind streams and corotating interaction regions. With one exception the events were not associated with ~100 keV solar electron intensity increases. The events showed also enhanced NeS/O and Fe/O ratios. The solar images indicate that the events were generally associated with the active regions located near a coronal hole.
description: accepted for publication in AIP Conference Proceedings for 'Thirteenth International Solar Wind Conference'
Symmetry breaking in binary chain with nonlinear sites
Creators: name: Maksimov, Dmitrii N.
name: Sadreev, Almas F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We consider a system of two or four nonlinear sites coupled with binary chain waveguides. When a monochromatic wave is injected into the first (symmetric) propagation channel the presence of cubic nonlinearity can lead to symmetry breaking giving rise to emission of antisymmetric wave into the second (antisymmetric) propagation channel of the waveguides. We found that in the case of nonlinear plaquette there is a domain in the parameter space where neither symmetry preserving nor symmetry breaking stable stationary solutions exit. As a result injection of a monochromatic symmetric wave gives rise to emission of nonsymmetric satellite waves with energies different from the energy of the incident wave. Thus, the response exhibits nonmonochromatic behavior.
Persistent current noise in normal and superconducting nanorings
Creators: name: Semenov, Andrew G.
name: Zaikin, Andrei D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate fluctuations of persistent current (PC) in nanorings both with and without dissipation and decoherence. We demonstrate that such PC fluctuations may persist down to zero temperature provided there exists either interaction with an external environment or an external (periodic) potential produced, e.g., by quantum phase slips in superconducting nanorings. Provided quantum coherence is maintained in the system PC noise remains coherent and can be tuned by an external magnetic flux $Φ_x$ piercing the ring. If quantum coherence gets suppressed by interactions with a dissipative bath PC noise becomes incoherent and $Φ_x$-independent.
description: 8 pages, 3 figures. Invited talk at FQMT'11
Approximation of discrete functions and size of spectrum
Creators: name: Olevskii, Alexander
name: Ulanovskii, Alexander
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 41A30

description: Let $Λ$ be a uniformly discrete set and $S$ be a compact set in $R$. We prove that if there exists a bounded sequence of functions in Paley--Wiener space $PW_S$, which approximates $δ-$functions on $Λ$ with $l^2-$error $d$, then measure($S$)$\geq 2π(1 - d^2)D^+(Λ)$. This estimate is sharp for every $d$. Analogous estimate holds when the norms of approximating functions have a moderate growth, and we find a sharp growth restriction.
Spectroscopy of Faint Kepler Mission Exoplanet Candidate Host Stars
Creators: name: Everett, Mark E.
name: Howell, Steve B.
name: Silva, David R.
name: Szkody, Paula
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Stellar properties are measured for a large set of Kepler Mission exoplanet candidate host stars. Most of these stars are fainter than 14th magnitude, in contrast to other spectroscopic follow-up studies. This sample includes many high-priority Earth-sized candidate planets. A set of model spectra are fitted to R~3000 optical spectra of 268 stars to improve estimates of Teff, log(g), and [Fe/H] for the dwarfs in the range 4750K5200K, includes a greater number of relatively evolved stars with larger radii than assumed by the mission on the basis of multi-color broadband photometry. About 26% of the modelled stars require radii to be revised upwards by a factor of 1.35 or greater, and modelling of 87% of the stars suggest some increase in radius. The sample presented here also exhibits a change in the incidence of planets larger than 3-4 Earth radii as a function of metallicity. Once [Fe/H] increases to >=-0.05, large planets suddenly appear in the sample while smaller planets are found orbiting stars with a wider range of metallicity. The modelled stellar spectra, as well as an additional 84 stars of mostly lower effective temperatures, are made available to the community.
description: 39 pages, 10 figures
Critical correlations in an ultracold Bose gas revealed by means of a temporal Talbot-Lau interferometer
Creators: name: Xiong, Wei
name: Zhou, Xiaoji
name: Yue, Xuguang
name: Chen, Xuzong
name: Wu, Biao
name: Xiong, Hongwei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We study experimentally the critical correlation in an ultra-cold Bose gas with a temporal Talbot-Lau (TL) interferometer. Near the critical temperature, we observe a bi-modal density distribution in an ultra-cold Bose gas after the application of the TL interferometer. The measured fraction of the narrower peak in the density distribution displays a clear peak within the critical regime. The peak position agrees with the critical temperature calculated with the finite-size and interaction corrections. The critical exponents are extracted from the peak and they agree with the critical exponents for the correlation length.
description: 5 pages, 3 figures and supplemental material
Elementary excitations of a Higgs-Yukawa system
Creators: name: Natti, E. R. Takano
name: Piza, A. F. R. de Toledo
name: Natti, P. L.
name: Lin, Chi-Yong
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: This work investigates the physics of elementary excitations for the so-called relativistic quantum scalar plasma system, also known as the Higgs-Yukawa system. Following the Nemes-Piza-Kerman-Lin many-body procedure, the Random-Phase Approximation (RPA) equations were obtained for this model by linearizing the Time-Dependent Hartree-Fock-Bogoliubov equations of motion around equilibrium. The resulting equations have a closed solution, from which the spectrum of excitation modes are studied. We show that the RPA oscillatory modes give the one-boson and two-fermion states of the theory. The results indicate the existence of bound states in certain regions in the phase diagram. Applying these results to recent LHC observations concerning the mass of the Higgs boson, we determine limits for the intensity of the coupling constant g of the Higgs-Yukawa model, in the RPA mean-field approximation, for three decay channels of the Higgs boson. Finally, we verify that, within our approximations, only Higgs bosons with masses larger than 190 GeV/c^2 can decay into top quarks.
description: The paper will appear in Volume 43 of the Brazilian Journal of Physics
Computational relativistic quantum dynamics and its application to relativistic tunneling and Kapitza-Dirac scattering
Creators: name: Bauke, Heiko
name: Klaiber, Michael
name: Yakaboylu, Enderalp
name: Hatsagortsyan, Karen Z.
name: Ahrens, Sven
name: Müller, Carsten
name: Keitel, Christoph H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Computational methods are indispensable to study the quantum dynamics of relativistic light-matter interactions in parameter regimes where analytical methods become inapplicable. We present numerical methods for solving the time-dependent Dirac equation and the time-dependent Klein-Gordon equation and their implementation on high performance graphics cards. These methods allow us to study tunneling from hydrogen-like highly charged ions in strong laser fields and Kapitza-Dirac scattering in the relativistic regime.
Prestigious early Roman gardens across the Empire: the significance of gardens and horticultural trends evidenced by pollen
Creators: name: Langgut, Dafna
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Space Science
subject: Medicine
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology

description: The present study has two main goals. The first is to reconstruct the botanical components that grew in the impressive garden of Villa Arianna (Stabiae). The garden, which was extensively destroyed and covered by tephra ash in 79 CE, is considered the largest peristyle garden in the Vesuvian region. Its plants were revealed based on a unique palynological-archaeological method involving the extraction of pollen from plaster attached to structures that faced the garden. The second aim is to compare this prestigious garden with other early elite Roman gardens, located in the eastern part of the Empire, to trace the importation of plants, horticultural trends, etc. For this purpose, gardens of Herod the Great, the client king of Judaea, which the author recently studied palynologically (in Caesarea, Herodium and Jericho), were compared with the new pollen results of Villa Arianna. The comparison between the gardens’ botanical components and their different landscapes led to the following conclusions: (1) Plants were imported from both ends of the Empire as elite products (rather than cash crops). Hazelnut (Corylus) and cedar (Cedrus) were introduced from west to east, while the date palm (Phoenix dactylifera) was introduced along an east-west axis. (2) The gardening trend of tree dwarfism was observed both at Villa Arianna and Jericho. (3) The gardens flourished in challenging habitats. At Villa Arianna and Caesarea, efforts were devoted to sustaining splendid gardens in the relatively harsh, saline Mediterranean Sea environment; at Herodium and Jericho, special efforts were required for the success of Mediterranean plants in semi-arid climate. (4) Herod’s mausoleum garden in Herodium, whose dark evergreen trees on the whitish slopes of the artificial tumulus could be seen from the Temple in Jerusalem, may have been inspired by the architectural arrangement of the Pantheon and the Mausoleum of Augustus, the patron of Herod.