cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Developments in physics of massive stars
Creators: name: Meynet, Georges
name: Ekstrom, Sylvia
name: Maeder, Andre
name: Hirschi, Raphael
name: Georgy, Cyril
name: Beffa, Coralie
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: New constraints on stellar models are provided by large surveys of massive stars, interferometric observations and asteroseismology. After a review of the main results so far obtained, we present new results from rotating models and discuss comparisons with observed features. We conclude that rotation is a key feature of massive star physics.
description: 13 pages, 10 figures, IAU Symp. 250, Massive stars as Cosmic Engines, F. Bresolin, P.A. Crowther, J. Puls Eds
Single molecule photon counting statistics for quantum mechanical chromophore dynamics
Creators: name: Bel, Golan
name: Zheng, Yujun
name: Brown, Frank L. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We extend the generating function technique for calculation of single molecule photon emission statistics [Y. Zheng and F. L. H. Brown, Phys. Rev. Lett., 90,238305 (2003)] to systems governed by multi-level quantum dynamics. This opens up the possibility to study phenomena that are outside the realm of purely stochastic and mixed quantum-stochastic models. In particular, the present methodology allows for calculation of photon statistics that are spectrally resolved and subject to quantum coherence. Several model calculations illustrate the generality of the technique and highlight quantitative and qualitative differences between quantum mechanical models and related stochastic approximations. Calculations suggest that studying photon statistics as a function of photon frequency has the potential to reveal more about system dynamics than the usual broadband detection schemes.
description: Submitted to the Journal of Physical Chemistry
Paradoxes of Probabilistic Programming
Creators: name: Jacobs, Jules
Publisher: name: arXiv
Year: 2021
Subjects: subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Probabilistic programming languages allow programmers to write down conditional probability distributions that represent statistical and machine learning models as programs that use observe statements. These programs are run by accumulating likelihood at each observe statement, and using the likelihood to steer random choices and weigh results with inference algorithms such as importance sampling or MCMC. We argue that naive likelihood accumulation does not give desirable semantics and leads to paradoxes when an observe statement is used to condition on a measure-zero event, particularly when the observe statement is executed conditionally on random data. We show that the paradoxes disappear if we explicitly model measure-zero events as a limit of positive measure events, and that we can execute these type of probabilistic programs by accumulating infinitesimal probabilities rather than probability densities. Our extension improves probabilistic programming languages as an executable notation for probability distributions by making it more well-behaved and more expressive, by allowing the programmer to be explicit about which limit is intended when conditioning on an event of measure zero.
Pantomime and community spirit: a "Cinderella story"
Creators: name: McConney, Annemarie
Publisher: name: University of British Columbia
Year: 2009

description: For the past 26 years, in one way or another, I have been connected to a unique private school located on the small island of Barbados. My connection to the school may be dated much earlier i f one considers that my grandmother was one of the first students to attend the school and later became an active member of the committee of management. Every so often life at this school becomes a little more exciting, as attention is focused on the next St. Winifred's School Pantomime. Pantomimes were introduced to the school in 1969 and were produced bi-annually until 1977. After a break of 12 years, they were reintroduced in 1989 and have continued to flourish ever since. As successful as each St. Winifred's pantomime proves to be, its future is hardly secure and every year the question arises, "Should we do another pantomime?" This study is an effort to answer that question and in answering it, provide justification for us and other schools to embark on similar theatre projects. Throughout the process of producing the 1996 pantomime "Cinderella", I recorded the journey of myself, cast and crew members in an attempt to understand, why we do this. Research was necessary to narrate the history of the past pantomimes at the school. Newspaper articles and letters from members of the audience and cast help to document the impact of these shows. Interviews were also held with the cast and crew of "Cinderella" about four weeks after the show had closed. It was an unforgettable journey through the year. One made more special by the heightened awareness of the significance of the St. Winifred's pantomimes. Apart from the obvious financial rewards, the major community benefits included positive public relations for the school, confidence and poise among cast members and the development of pride and responsibility among parents and friends of the school. There is little doubt left in my mind that the pantomimes "give and keep giving," and theatre in the school has a remarkable effect on the school and its wider community. COMMUNITY WORK IS LIKE THERAPY. WE MUST STRIVE TO EMPOWER PEOPLE. PROMOTING INVOLVEMENT IN ANY ACTIVITY IS NOT ABOUT GIVING PEOPLE THINGS TO DO, IT IS ABOUT MAKING PEOPLE BELIEVE THEY HAVE A CONTRIBUTION TO MAKE. Sharon Carmichael, Barbadian Psychotherapist.
Optical characterization of nanocrystallized AlN:Er films prepared by magnetron sputtering
Creators: name: Brien, Valerie
name: Dossot, Manuel
name: Rinnert, Hervé
name: Sajjad, Sajjad Hussain
name: Humbert, Bernard
name: Pigeat, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In the prospect of understanding the photoluminescence mechanisms of AlN films doped with erbium and targeting photonic applications we have synthesized non doped and Er-doped AlN films with different crystallized nanostructures by using PVD magnetron sputtering. Their crystalline morphology and their visible photoluminescence properties were precisely measured.Due to the weak cross-section absorption of rare earths like erbium, it is necessary to obtain an efficient energy transfer mechanism between the host matrix and the rare earth to obtain high luminescence efficiency. Our strategy is then to elaborate some nanostructures that could introduce additional intermediate electronic levels within the gap thanks to the presence of structural defects (point defects, grain boundaries{\ldots}) and could lead to energy transfer from the AlN matrix to the rare earth.Doped and non-doped AlN films were prepared by radio frequency magnetron sputtering by using different experimental conditions that will be detailed. It will notably be shown how a negative polarization of samples during deposition allows obtaining crystalline morphologies ranging from the classical columnar structure to a highly disordered polycrystalline structure with grains of several nanometers (nearly amorphous). The nanostructures of the films could be categorized in three types: 1) type 1 was nanocolumnar (width of column ~ 15 nm), 2) type 2 was made of short columns (width of column ~ 10 nm) and 3) the last type was made of equiaxed nanocrystallites (size of grains ~3-4 nm).High-resolution photoluminescence spectroscopy was performed to characterize their optical behaviour. The samples were excited by the laser wavelengths at 458, 488 or 514 nm. A broad photoluminescence band was observed centred around 520 nm in columnar samples. In the same energy range, the highly resolved spectra also showed several sharp emission peaks. This fine structure could be attributed to erbium transitions. This fine structure tended to disappear going from type 1 to type 3 samples. Indeed, the relative intensity of the peaks decreased and their full width at half maximum increased. This change could be related to the density of defects that increased when the size of the grains decreased. The photoluminescence properties of the films in the visible range will be discussed in relation with their structure.
Controllable Coupling in Phase-Coupled Flux Qubits
Creators: name: Kim, Mun Dae
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose a scheme for tunable coupling of phase-coupled flux qubits. The phase-coupling scheme can provide a strong coupling strength of the order of Josephson coupling energy of Josephson junctions in the connecting loop, while the previously studied inductive coupling scheme cannot provide due to small mutual inductance and induced currents. We show that, in order to control the coupling, we need {\it two} dc-SQUID's in the connecting loop and the control fluxes threading the dc-SQUID's must be in {\it opposite} directions. The coupling strength is analytically calculated as a function of the control flux at the co-resonance point.
description: version to appear in Phys. Rev. B
Thermal corrections to the Casimir effect
Creators: name: Brevik, Iver
name: Ellingsen, Simen A.
name: Milton, Kimball A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Casimir effect, reflecting quantum vacuum fluctuations in the electromagnetic field in a region with material boundaries, has been studied both theoretically and experimentally since 1948. The forces between dielectric and metallic surfaces both plane and curved have been measured at the 10 to 1 percent level in a variety of room-temperature experiments, and remarkable agreement with the zero-temperature theory has been achieved. In fitting the data various corrections due to surface roughness, patch potentials, curvature, and temperature have been incorporated. It is the latter that is the subject of the present article. We point out that, in fact, no temperature dependence has yet been detected, and that the experimental situation is still too fluid to permit conclusions about thermal corrections to the Casimir effect. Theoretically, there are subtle issues concerning thermodynamics and electrodynamics which have resulted in disparate predictions concerning the nature of these corrections. However, a general consensus has seemed to emerge that suggests that the temperature correction to the Casimir effect is relatively large, and should be observable in future experiments involving surfaces separated at the few micrometer scale.
description: 21 pages, 9 eps figures, uses iopart.cls. Final version to be published in New Journal of Physics, contains Conclusion and clarified remarks
Ikonen neu:gefasst oder über das Menschsein in unserer heutigen Medienkultur
Creators: name: Džalto, Davor
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 63 Nr. 4 (2014): Ökumenische Rundschau, Band 63, Heft 4
แนวคิดเศรษฐกิจพอเพียงจากหนังตะลุงสู่การปฏิบัติใช้ในชีวิตประจำวันของนายหนังและผู้ชม
Creators: name: สุกิตติ์ สวนอินทร์
name: สากล สถิตวิทยานันท์
name: ปราโมชย์ ประจนปัจจนึก
Publisher: name: สถาบันการจัดการปัญญาภิวัฒน์
Year: 2558
Subjects: แนวคิดเศรษฐกิจพอเพียง, หนังตะลุง

description: พิเศษ, 7, วารสารปัญญาภิวัฒน์
DURABILITY AND PRESTRESS LOSS IN HIGHWAY BRIDGE BEAMS
Creators: name: Grace, Nabil
name: Enomoto, Tsuyoshi
name: Mohamed, Mohamed
name: Kerolos Abdo
name: Bebawy, Mena
Publisher: name: figshare
Year: 2021
Subjects: subject: 90506 Structural Engineering
subject: FOS: Civil engineering

description: The use of carbon fiber-reinforced polymer (CFRP) strands in precast prestressed bridge beam construction requires careful consideration for the long-term performance of CFRP materials. In regions with harsh winters, repeated freeze and thaw cycles can lead to deterioration of the structural elements. On the other hand, warm weather can impact the mechanical properties and effective prestressing force in CFRP strands. Through this experimental study, unbonded CFRP specimens prestressed to various levels of prestressing force were subjected to harsh winter and summer conditions for 19 months. The monitoring curves were compared with those of identical specimens preserved in controlled laboratory conditions. In a parallel investigation, five decked bulb T beams prestressed with CFRP strands were designed, constructed, and tested under a four-point-load setup to evaluate the effect of temperature and environmental conditions on the prestress loss in bonded CFRP strands. One beam was tested to failure 28 days after construction. Two beams were retained outdoors and were tested after one and two years, while the last two beams were preserved in controlled laboratory conditions and were also tested after one and two years. Test results showed that parameters such as relaxation rate and prestress loss in CFRP strands can be accurately estimated and implemented in the design of bridge beams. In addition, although seasonal temperature changes do seem to temporarily affect the level of the effective prestressing force, they do not seem to induce any permanent damage or alteration in the mechanical properties of CFRP strands.
Herder: (Biblical) Poetry & Philosophy
Creators: name: Murray, Marc-Andre William
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2024
Subjects: Herder
Poetry
German Enlightenment
Religion
Bible
Old Testament

description: The goal of this thesis is to elaborate the place of J.G. Herder’s concept of poetry within his philosophy. Through a discussion of his study of the Old Testament, On the Spirit of Hebrew Poetry, I examine the relationship between J.G. Herder’s poetics and his naturalism. Herder’s hermeneutic, developed in the context of his literary criticism, is at the heart of his philosophy. I interpret Herder’s views on poetry as an integral part of his criticism of 17th century rationalism, and one that he develops in union with the conclusions he draws from philosophy and the natural sciences.
DURABILITY AND PRESTRESS LOSS IN HIGHWAY BRIDGE BEAMS.pdf
Creators: name: Grace, Nabil
name: Enomoto, Tsuyoshi
name: Mohamed, Mohamed
name: Kerolos Abdo
name: Bebawy, Mena
Publisher: name: figshare
Year: 2021
Subjects: subject: 90506 Structural Engineering
subject: FOS: Civil engineering

description: The use of carbon fiber-reinforced polymer (CFRP) strands in precast prestressed bridge beam construction requires careful consideration for the long-term performance of CFRP materials. In regions with harsh winters, repeated freeze and thaw cycles can lead to deterioration of the structural elements. On the other hand, warm weather can impact the mechanical properties and effective prestressing force in CFRP strands. Through this experimental study, unbonded CFRP specimens prestressed to various levels of prestressing force were subjected to harsh winter and summer conditions for 19 months. The monitoring curves were compared with those of identical specimens preserved in controlled laboratory conditions. In a parallel investigation, five decked bulb T beams prestressed with CFRP strands were designed, constructed, and tested under a four-point-load setup to evaluate the effect of temperature and environmental conditions on the prestress loss in bonded CFRP strands. One beam was tested to failure 28 days after construction. Two beams were retained outdoors and were tested after one and two years, while the last two beams were preserved in controlled laboratory conditions and were also tested after one and two years. Test results showed that parameters such as relaxation rate and prestress loss in CFRP strands can be accurately estimated and implemented in the design of bridge beams. In addition, although seasonal temperature changes do seem to temporarily affect the level of the effective prestressing force, they do not seem to induce any permanent damage or alteration in the mechanical properties of CFRP strands.
Flexure updates to MOSFIRE on the Keck I telescope
Creators: name: Hutchison, Taylor A.
name: Walawender, Josh
name: Kwok, Shui Hung
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a recent evaluation and updates applied to the Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) on the Keck I telescope. Over the course of significantly long integrations, when MOSFIRE sits on one mask for $>$4 hours, a slight drift in mask stars has been measured. While this does not affect all science-cases done with MOSFIRE, the drift can smear out signal for observers whose science objective depends upon lengthy integrations. This effect was determined to be the possible result of three factors: the internal flexure compensation system (FCS), the guider camera flexure system, and/or the differential atmospheric refraction (DAR) corrections. In this work, we will summarize the three systems and walk through the current testing done to narrow down the possible culprit of this drift and highlight future testing to be done.
description: 14 pages, 14 figures; to appear in Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII
Diversity of reproduction rate supports cooperation in the prisoner's dilemma game on complex networks
Creators: name: Szolnoki, A.
name: Perc, M.
name: Szabo, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: In human societies the probability of strategy adoption from a given person may be affected by the personal features. Now we investigate how an artificially imposed restricted ability to reproduce, overruling ones fitness, affects an evolutionary process. For this purpose we employ the evolutionary prisoner's dilemma game on different complex graphs. Reproduction restrictions can have a facilitative effect on the evolution of cooperation that sets in irrespective of particularities of the interaction network. Indeed, an appropriate fraction of less fertile individuals may lead to full supremacy of cooperators where otherwise defection would be widespread. By studying cooperation levels within the group of individuals having full reproduction capabilities, we reveal that the recent mechanism for the promotion of cooperation is conceptually similar to the one reported previously for scale-free networks. Our results suggest that the diversity in the reproduction capability, related to inherently different attitudes of individuals, can enforce the emergence of cooperative behavior among selfish competitors.
description: 10 pages, 4 figures, to be published in EPJB
Koopman analysis in oscillator synchronization
Creators: name: Hu, Jing
name: Lan, Yueheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Synchronization is an important dynamical phenomenon in coupled nonlinear systems, which has been studied extensively in recent years. However, analysis focused on individual orbits seems hard to extend to complex systems while a global statistical approach is overly cursory. Koopman operator technique seems to well balance the two approaches. In this paper, we extend Koopman analysis to the study of synchronization of coupled oscillators by extracting important eigenvalues and eigenfunctions from the observed time series. A renormalization group analysis is designed to derive an analytic approximation of the eigenfunction in case of weak coupling that dominates the oscillation. For moderate or strong couplings, numerical computation further confirms the importance of the average frequencies and the associated eigenfunctions. The synchronization transition points could be located with quite high accuracy by checking the correlation of neighbouring eigenfunctions at different coupling strengths, which is readily applied to other nonlinear systems.
The nonlinear matter power spectrum
Creators: name: Ma, Zhaoming
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We modify the public PM code developed by Anatoly Klypin and Jon Holtzman to simulate cosmology with arbitrary initial power spectrum and equation of state of dark energy. With this tool in hand, we perform the following studies on the matter power spectrum. With an artificial sharp peak at k~0.2 h/Mpc in the initial power spectrum, we find that the position of the peak is not shifted by nonlinear evolution. We also find that the existence of a peak in the linear power spectrum would boost the nonlinear power at all scales evenly. This is contrary to what HKLM scaling relation predicts, but roughly consistent with that of halo model. We construct two dark energy models with the same linear power spectra today but different linear growth histories. We demonstrate that their nonlinear power spectra differ at the level of the maximum deviation of the corresponding linear power spectra in the past. Similarly, two constructed dark energy models with the same growth histories result in consistent nonlinear power spectra. This is hinting, not a proof, that linear power spectrum together with linear growth history uniquely determine the nonlinear power spectrum. Based on these results, we propose that linear growth history be included in the next generation fitting formulas of nonlinear power spectrum. (abridged)
description: Reference added, minor changes, accepted by ApJ
Thin-film aspects of superconducting nickelates
Creators: name: Bernardini, F.
name: Iglesias, L.
name: Bibes, M.
name: Cano, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The discovery of superconductivity in infinite-layer nickelates has attracted much attention due to their association to the high-$T_c$ cuprates. Cuprate superconductivity was first demonstrated in bulk samples and subsequently in thin films. In the nickelates, however, the situation has been reversed: although surging as a bulk phenomenon, nickelate superconductivity has only been reported in thin films so far. At the same time, the specifics of infinite-layer nickelates yield distinct interface and surface effects that determine their bulk vs thin-film behavior. In this paper, we provide an overview on these important aspects.
description: 6 pages, 2 figures. Front. Phys.
Charge-memory polaron effect in molecular junctions
Creators: name: Ryndyk, Dmitry A.
name: D'Amico, Pino
name: Cuniberti, Gianaurelio
name: Richter, Klaus
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The charge-memory effect, bistability and switching between charged and neutral states of a molecular junction, as observed in recent STM experiments, is considered within a minimal polaron model. We show that in the case of strong electron-vibron interaction the rate of spontaneous quantum switching between charged and neutral states is exponentially suppressed at zero bias voltage but can be tuned through a wide range of finite switching timescales upon changing the bias. We further find that, while junctions with symmetric voltage drop give rise to random switching at finite bias, asymmetric junctions exhibit hysteretic behavior enabling controlled switching. Lifetimes and charge-voltage curves are calculated by the master equation method for weak coupling to the leads and at stronger coupling by the equation-of-motion method for nonequilibrium Green functions.
description: 4 pages, 5 figures, submitted
Student perceptions of their experience in sexuality education
Creators: name: Noon, Saleema
Publisher: name: University of British Columbia
Year: 2009

description: To date, most research in sexuality education has been conducted in the form of outcome or evaluation studies, primarily concerned with determining the quality, effectiveness or worth of a program. Although very little research has investigated students' subjective perceptions of their experience in sexuality education, several authors (e.g., Aoki, 1988; Borich & Jemelka, 1982; Patton, 1990; Voss, 1980) argue that such studies would provide valuable insights into sexuality education. The purpose of this study was to explore, through semi-structured interviews, students' perceptions of their experience in sexuality education. More specifically, this study examined, from the student's perspective, components of sexuality education such as the content, the teacher, the teaching methods used, the message conveyed to students about sexuality and the relevance to students' lives and concerns. Students' perceptions of the influence of the unit on their sexuality-related knowledge, sexuality-related attitudes and sexual behaviour or behavioural intentions were also sought. Fourteen 10th grade students (8 female, 6 male) who recently completed a unit on human sexuality in a Lower Mainland junior secondary school were interviewed for this study, and these interviews were taperecorded and transcribed for analysis. Students' comments revealed that, although the curriculum document indicated a comprehensive approach, the unit was problem-focused. Students differed in their feelings about the teaching methods used, but almost all students viewed their sexuality education teacher in a positive manner. The message conveyed to students about sexuality was neither positive nor negative. Although abstinence was presented by the teachers as the preferable alternative to being sexually active, the teachers also recognised that not all teens choose to be abstinent, and need to be taught responsible sexual behaviour. Gender and relevance emerged as themes in interviews. It appears that the unit on human sexuality was of limited relevance to the lives and concerns of students who were not yet sexually active, and that male and female students had a different kind of experience in sexuality education.
INFRA-ICE: an ultra-high vacuum experimental station for laboratory astrochemistry
Creators: name: Santoro, Gonzalo
name: Sobrado, Jesús. M.
name: Tajuelo-Castilla, Guillermo
name: Accolla, Mario
name: Martínez, Lidia
name: Azpeitia, Jon
name: Lauwaet, Koen
name: Cernicharo, José
name: Ellis, Gary J.
name: Martín-Gago, José Ángel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Laboratory astrochemistry aims at simulating in the laboratory some of the chemical and physical processes that operate in different regions of the Universe. Amongst the diverse astrochemical problems that can be addressed in the laboratory, the evolution of cosmic dust grains in the different regions of the interstellar medium (ISM) and its role in the formation of new chemical species through catalytic processes present significant interest. In particular, in the dark clouds of the ISM dust grains are coated by icy mantles and it is thought that the ice-dust interaction plays a crucial role in the development of the chemical complexity observed in space. Here, we present a new ultra-high vacuum experimental station devoted to simulate the complex conditions of the coldest regions of the ISM. The INFRA-ICE machine can be operated as a standing alone setup or incorporated in a larger experimental station called Stardust, which is dedicated to simulate the formation of cosmic dust in evolved stars. As such, INFRA-ICE expands the capabilities of Stardust allowing the simulation of the complete journey of cosmic dust in space, from its formation in asymptotic giant branch stars (AGBs) to its processing and interaction with icy mantles in molecular clouds. To demonstrate some of the capabilities of INFRA-ICE, we present selected results on the UV photochemistry of undecane (C$_{11}$H$_{24}$) at 14 K. Aliphatics are part of the carbonaceous cosmic dust and, recently, aliphatics and short n-alkanes have been detected in-situ in the comet 67P/Churyumov-Gerasimenko.
Bosonization of the lowest Landau level in arbitrary dimensions: edge and bulk dynamics
Creators: name: Karabali, Dimitra
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We discuss the bosonization of nonrelativistic fermions interacting with non-Abelian gauge fields in the lowest Landau level in the framework of higher dimensional quantum Hall effect. The bosonic action is a one-dimensional matrix action, which can also be written as a noncommutative field theory, invariant under $W_N$ transformations. The requirement that the usual gauge transformation should be realized as a $W_N$ transformation provides an analog of a Seiberg-Witten map, which allows us to express the action purely in terms of bosonic fields. The semiclassical limit of this, describing the gauge interactions of a higher dimensional, non-Abelian quantum Hall droplet, produces a bulk Chern-Simons type term whose anomaly is exactly cancelled by a boundary term given in terms of a gauged Wess-Zumino-Witten action.
description: 29 pages ; typos corrected, two references added
WINDCORE PROJECT
Creators: name: HARALD VAN DER MIJLE MEIJER
name: MARCO CABONI
Publisher: name: Zenodo
Year: 2021
Subjects: wind
wind power
wind turbines
floating wind

description: This presentation was part of the EERA JP Wind SP4 WORKSHOP on Blade Erosion from the prospective of loads, controls and aerodynamics (14th of December, 2021 - Webinar).
Strategies and obstacles in constructing realistic higher-dimensional models
Creators: name: Grzadkowski, Bohdan
name: Wudka, Jose
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss several aspects of higher dimensional models that contain bulk gauge and fermion fields only. In particular we argue that non-standard boundary conditions involving charge-conjugate fermion fields offer attractive model building possibilities. We also discuss a no-go theorem for 5-dimensional models which severely limits their phenomenological relevance.
description: 4 pages, 1 fugure; contribution to the SUSY06 proceedings
Mental health and stress level of Ukrainians seeking psychological help online
Creators: name: Asanov, Anastasiya-Mariya
name: Asanov, Igor
name: Bünstorf, Guido
Publisher: name: Universität Kassel
Year: 2023
Subjects: subject: Ukrainische Bevölkerung
subject: Stresslevel
subject: Mentale Gesundheit
subject: online Hilfe suchen
subject: 150
subject: 300
subject: 610
subject: Ukraine
subject: Psychische Gesundheit
subject: Suche
subject: Hilfe
subject: Online-Dienst

description: Gefördert durch den Publikationsfonds der Universität Kassel
Continuous-Time Quantum Walks on Trees in Quantum Probability Theory
Creators: name: Konno, Norio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A quantum central limit theorem for a continuous-time quantum walk on a homogeneous tree is derived from quantum probability theory. As a consequence, a new type of limit theorems for another continuous-time walk introduced by the walk is presented. The limit density is similar to that given by a continuous-time quantum walk on the one-dimensional lattice.
description: 13 pages, Journal-ref added
The Matrix Chern-Simons One-form as a Universal Chern-Simons Theory
Creators: name: Nair, V. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider different large ${\cal N}$ limits of the one-dimensional Chern-Simons action $i\int dt~ \Tr (\del_0 +A_0)$ where $A_0$ is an ${\cal N}\times{\cal N}$ antihermitian matrix. The Hilbert space on which $A_0$ acts as a linear transformation is taken as the quantization of a $2k$-dimensional phase space ${\cal M}$ with different gauge field backgrounds. For slowly varying fields, the large ${\cal N}$ limit of the one-dimensional CS action is equal to the $(2k+1)$-dimensional CS theory on ${\cal M}\times {\bf R}$. Different large ${\cal N}$ limits are parametrized by the gauge fields and the dimension $2k$. The result is related to the bulk action for quantum Hall droplets in higher dimensions. Since the isometries of ${\cal M}$ are gauged, this has implications for gravity on fuzzy spaces. This is also briefly discussed.
description: 37 pages, references and a comment added
Compact heterotic orbifolds in blow-up
Creators: name: Nibbelink, Stefan Groot
name: Klevers, Denis
name: Ploger, Felix
name: Trapletti, Michele
name: Vaudrevange, Patrick K. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compare heterotic string models on orbifolds with supergravity models on smooth compact spaces, obtained by resolving the orbifold singularities. Our main focus is on heterotic E8xE8 models on the resolution of the compact T^6/Z_3 orbifold with Wilson lines. We explain how different gauge fluxes at various resolved fixed points can be interpreted in blow down as Wilson lines. Even when such Wilson lines are trivial from the orbifold perspective, they can still lead to additional symmetry breaking in blow-up. Full agreement is achieved between orbifold and resolved models, at the level of gauge interactions, massless spectrum and anomaly cancellation. In this matching the blow-up modes are of crucial importance: they play the role of model-dependent axions involved in the cancellation of multiple anomalous U(1)'s on the resolution. We illustrate various aspects by investigating blow-ups of a Z_3 MSSM model with two Wilson lines: if all its fixed points are resolved simultaneously, the SM gauge group is necessarily broken. Finally, we explore in detail the anomaly cancellation on the complex two dimensional resolution of C^2/Z_2.
description: 42 pages
Numerical detection of synchronization phenomena in quasi-periodic solutions
Creators: name: Seifert, Alexander
name: Bäuerle, Simon Andreas
name: Hetzler, Hartmut
Publisher: name: Universität Kassel
Year: 2023
Subjects: subject: 620
subject: Synchronisierung
subject: Dynamisches System
subject: Grundfrequenz
subject: Parametrisierung

description: Gefördert im Rahmen des Projekts DEAL
CP Violating $hW^+W^-$ Coupling in the Standard Model and Beyond
Creators: name: Huang, Da
name: Morais, António P.
name: Santos, Rui
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Inspired by the recent development in determining the property of the observed Higgs boson, we explore the $CP$-violating (CPV) $- c_{\rm CPV} h W^{+\, μν}\tilde{W}^{-}_{μν}/v$ coupling in the Standard Model (SM) and beyond, where $W^{\pm \, μν}$ and $\tilde{W}^{\pm\,μν}$ denote the $W$-boson field strength and its dual. To begin with, we show that the leading-order SM contribution to this CPV vertex appears at two-loop level. By summing over the quark flavor indices in the two loop integrals analytically, we can estimate the order of the corresponding Wilson coefficient to be $c^{\rm SM}_{\rm CPV} \sim {\cal O}(10^{-23})$, which is obviously too small to be probed at the LHC and planned future colliders. Then we investigate this CPV $hW^+ W^-$ interaction in two Beyond the Standard Model benchmark models: the left-right model and the complex 2-Higgs doublet model (C2HDM). Unlike what happens for the SM, the dominant contributions in both models arise at the one-loop level, and the corresponding Wilson coefficient can be as large as of ${\cal O}(10^{-9})$ in the former model and of ${\cal O}(10^{-3})$ for the latter. In light of such a large CPV effect in the $hW^+W^-$ coupling, we also give the formulae for the leading one-loop contribution to the related CPV $hZZ$ effective operator in the C2HDM. The order of magnitude of the Wilson coefficients in the C2HDM may be within reach of the high-luminosity LHC or planned future colliders.
description: 19 pages, 4 figures
Solar Wind Electric Fields in the Ion Cyclotron Frequency Range
Creators: name: Kellogg, P. J.
name: Bale, S. D.
name: Mozer, F. S.
name: Horbury, T. S.
name: Reme, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Measurements of fluctuations of electric fields in the frequency range from a fraction of one Hz to 12.5 Hz are presented, and corrected for the Lorentz transformation of magnetic fluctuations to give the electric fields in the plasma frame. The electric fields are large enough to provide the dominant force on the ions of the solar wind in the region near the ion cyclotron frequency of protons, larger than the force due to magnetic fluctuations. They provide sufficient velocity space diffusion or heating to counteract conservation of magnetic moment in the expanding solar wind to maintain nearly isotropic velocity distributions.
Showcasing the multifaceted aspects of agricultural transformation: The example of mountain oases in Oman
Creators: name: Schlecht, Eva
name: Dickhöfer, Uta
name: Aloufi, Shadha
name: Alqaisi, Othman
name: Bürkert, Andreas
Publisher: name: Universität Kassel
Year: 2022
Subjects: subject: agriculture
subject: livestock
subject: crops
subject: agricultural irrigation
subject: agricultural workers
subject: fruits
subject: goats
subject: ruminants
subject: 630
subject: Oman
subject: Achdar (Oman)
subject: Oase
subject: Landwirtschaft
subject: Tierhaltung
subject: Ernte
subject: Bewässerung
subject: Transformation
subject: Datenauswertung

description: Gefördert durch den Publikationsfonds der Universität Kassel
3.6-7.9 um Photometry of L and T Dwarfs and the Prevalence of Vertical Mixing in their Atmospheres
Creators: name: Leggett, S. K.
name: Saumon, D.
name: Marley, M. S.
name: Geballe, T. R.
name: Golimowski, D. A.
name: Stephens, D.
name: Fan, X.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new L' (3.75 um) photometry of six L and T dwarfs, and M' (4.70 um) photometry of ten L and T dwarfs, observed at Gemini Observatory, and new 3.55, 4.49, 5.73 and 7.87 um photometry of nine L and T dwarfs, obtained with the Spitzer Space Telescope. The sample includes unusually blue and red dwarfs from our near-infrared studies. The data are combined with published L', M' and Spitzer photometry of L and T dwarfs, and trends of colors with spectral type and other colors are examined. Model atmospheres by Marley and Saumon are used to generate synthetic colors for ranges of effective temperature, gravity, grain sedimentation efficiency, metallicity and vertical mixing efficiency. We explore how these parameters affect the mid-infrared colors of L and T dwarfs and find that the data are modelled satisfactorily only if substantial vertical mixing occurs in both L- and T-dwarf atmospheres. The location and range of the L and T dwarf sequences in IRAC color-color and color - magnitude diagrams is also only reproduced if this mixing occurs, with a range of efficiency described by K_zz ~ 10^2-10^6 cm^2/s. The colors of the unusually red dwarfs are best reproduced by non-equilibrium models with low sedimentation efficiency, i.e. thick cloud decks, and those of the unusually blue dwarfs by non-equilibrium models with high sedimentation efficiency, i.e. thin cloud decks. The K-L' and Spitzer [3.55]-[4.49] colors can be used as indicators of effective temperature for L and T dwarfs, but care must be taken to include gravity and metallicity effects for late-T dwarfs and vertical mixing for both late-L and T dwarfs.
description: Accepted for publication in the Astrophysical Journal; 21 pages, 8 Figures, 3 Tables
Patch Size Evolution During Pulsating Aurora
Creators: name: Partamies, N.
name: Bolmgren, K.
name: Heino, E.
name: Ivchenko, N.
name: Borovsky, J. E.
name: Sundberg, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We report both decreasing and increasing trends in the patch sizes during pulsating aurora events. About 150 pulsating auroral events over the Fennoscandian Lapland have been successfully analyzed for their average patch size, total patch area, and number of patches as a function of event time, typically 1-2 hr. An automatic routine has been developed to detect patches in the all-sky camera images. In addition to events with decreasing and increasing average patch size evolution over the course of the pulsating aurora, events with no size trends and events with intermittently increasing and decreasing patch size trends were also found. In this study, we have analyzed a subset of events for which the average and total patch size systematically increase or decrease. The events with increasing patch size trend do not experience a decrease in the peak emission height, which was previously associated with the behavior of pulsating aurora precipitation. Furthermore, the events with increasing patch sizes have shorter lifetimes and twice as many substorm-injected energetic electrons at geosynchronous orbit as the events with decreasing patch sizes. Half of the events with increasing patch sizes occur during substorm expansion phases, while a majority (64%) of the ones with decreasing patch sizes take place during the recovery phase. These findings suggest that the visual appearance of pulsating aurora may be used as an indication of the pulsating aurora energy deposition to the atmosphere.
Erosion safe mode control demonstration
Creators: name: Hasager, Charlotte
Publisher: name: Zenodo
Year: 2021
Subjects: wind
wind power
wind turbines
floating wind
offshore wind

description: This presentation was part of the EERA JP Wind SP4 WORKSHOP on Blade Erosion from the prospective of loads, controls and aerodynamics (14th of December, 2021 - Webinar).
ปัจจัยที่มีผลต่อภาพลักษณ์ขององค์กร ในความคิดเห็นของผู้บริโภคเขตภาคตะวันออกเฉียงเหนือตอนล่าง: กรณีศึกษา สถานีโทรทัศน์ไทยทีวีสีช่อง 3
Creators: name: สลิลทิพย์ เข็มทอง
Publisher: name: สถาบันการจัดการปัญญาภิวัฒน์
Year: 2558
Subjects: การสื่อสารการตลาดแบบบูรณาการด้วยความรับผิดชอบต่อสังคมขององค์กร, ภาพลักษณ์ขององค์กร, ความคิดเห็นของผู้บริโภค

description: พิเศษ, 7, วารสารปัญญาภิวัฒน์
Neural network interatomic potential for laser-excited materials
Creators: name: Plettenberg, Pascal
name: Bauerhenne, Bernd
name: Garcia, Martin Ezequiel
Publisher: name: Universität Kassel
Year: 2023
Subjects: subject: Neuronale Netze
subject: Datengesteuerte interatomare Potentiale
subject: Laser-erregte Materialien
subject: 620
subject: Neuronales Netz
subject: Maschinelles Lernen
subject: Laser
subject: Erregung
subject: Material

description: Gefördert im Rahmen des Projekts DEAL
Towards Expectation-Maximization by SQL in RDBMS
Creators: name: Zhao, Kangfei
name: Yu, Jeffrey Xu
name: Rong, Yu
name: Liao, Ming
name: Huang, Junzhou
Publisher: name: arXiv
Year: 2021
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Integrating machine learning techniques into RDBMSs is an important task since there are many real applications that require modeling (e.g., business intelligence, strategic analysis) as well as querying data in RDBMSs. In this paper, we provide an SQL solution that has the potential to support different machine learning modelings. As an example, we study how to support unsupervised probabilistic modeling, that has a wide range of applications in clustering, density estimation and data summarization, and focus on Expectation-Maximization (EM) algorithms, which is a general technique for finding maximum likelihood estimators. To train a model by EM, it needs to update the model parameters by an E-step and an M-step in a while-loop iteratively until it converges to a level controled by some threshold or repeats a certain number of iterations. To support EM in RDBMSs, we show our answers to the matrix/vectors representations in RDBMSs, the relational algebra operations to support the linear algebra operations required by EM, parameters update by relational algebra, and the support of a while-loop. It is important to note that the SQL'99 recursion cannot be used to handle such a while-loop since the M-step is non-monotonic. In addition, assume that a model has been trained by an EM algorithm, we further design an automatic in-database model maintenance mechanism to maintain the model when the underlying training data changes.We have conducted experimental studies and will report our findings in this paper.
description: 12 pages
Why Does Zipf's Law Break Down in Rank-Size Distribution of Cities?
Creators: name: Kuninaka, Hiroto
name: Matsushita, Mitsugu
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We study rank-size distribution of cities in Japan on the basis of data analysis. From the census data after World War II, we find that the rank-size distribution of cities is composed of two parts, each of which has independent power exponent. In addition, the power exponent of the head part of the distribution changes in time and Zipf's law holds only in a restricted period. We show that Zipf's law broke down due to both of Showa and Heisei great mergers and recovered due to population growth in middle-sized cities after the great Showa merger.
description: 6 pages, 9 figures, resubmitted to J. Phys. Soc. Jpn
A model of non-minimally coupled gravitation and electromagnetism in (1+2) dimensions
Creators: name: Ünlütürk, Kıvanç İ.
name: Yetişmişoğlu, Cem
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Following earlier works of Dereli and collaborators, we study a three dimensional toy model where we extend the topologically massive gravity with electrodynamics by the most general $RF^2$-type non-minimal coupling terms. Here $R$ denotes the possible curvature terms and $F$ denotes the electromagnetic 2-form. We derive the variational field equations and look for exact solutions on constant negative curvature space-times with a constant, self-dual electromagnetic field. The notion of self-dual electromagnetic fields in three dimensions is introduced by Dereli and collaborators in the study of exact solutions of models with gravity-electromagnetism couplings. We note the conditions that the parameters of the model have to satisfy for these self-dual solutions to exist.
description: This work is dedicated to Tekin Dereli for his 72nd birthday and will soon appear in his Festschrift in J. Phys. Conf. Ser