cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Perceptions, Strategies, and Challenges of Nursing Students in Virtual Simulation: Concurrent Mixed-Method Study
Creators: name: Calma, John Paulo
Publisher: name: Zenodo
Year: 2023

description: E-learning methods have emerged as a promising solution for universities. This research explores the utilization of virtual simulation in nursing education, particularly in the context of the COVID-19 pandemic, where synchronous online learning has become crucial. Wesleyan University- the Philippines, College of Nursing has adopted virtual simulation as a pedagogical strategy to enhance nursing students' competency in clinical settings. However, little is known about students' perceptions of this innovative approach. To address this gap, a concurrent mixed-method approach was employed, combining quantitative and qualitative data collection methods. The study found that nursing students generally had a moderately positive perception of virtual simulation as a learning modality. Notably, age, sex, and year/level of the respondents did not significantly correlate with their perceptions, suggesting that virtual simulation is accessible and acceptable across various demographics. The qualitative analysis revealed four major themes: innovative technology, challenges, flexible strategies, and perceptions, highlighting the multifaceted nature of virtual simulation implementation. Virtual simulation emerged as a valuable tool in nursing education, especially in skill-based online courses. It offers flexibility, accessibility, and the potential for enhancing information acquisition and clinical thinking. The findings indicate that nursing students can benefit from virtual simulation, particularly during the COVID-19 pandemic when in-person clinical experiences may be limited. The research findings suggest that the implementation of virtual simulation can be tailored to the specific needs of students. As the pandemic continues to reshape education, virtual simulation stands as a promising approach to bridge the gap between theoretical knowledge and practical clinical skills in nursing education.
Gapped Goldstones at the cut-off scale: a non-relativistic EFT
Creators: name: Cuomo, Gabriel
name: Esposito, Angelo
name: Gendy, Emanuele
name: Khmelnitsky, Andrei
name: Monin, Alexander
name: Rattazzi, Riccardo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Other Condensed Matter (cond-mat.other)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: At finite density, the spontaneous breakdown of an internal non-Abelian symmetry dictates, along with gapless modes, modes whose gap is fixed by the algebra and proportional to the chemical potential: the gapped Goldstones. Generically the gap of these states is comparable to that of other non-universal excitations or to the energy scale where the dynamics is strongly coupled. This makes it non-straightforward to derive a universal ef effective field theory (EFT) description realizing all the symmetries. Focusing on the illustrative example of a fully broken SU (2) group, we demonstrate that such an EFT can be constructed by carving out around the Goldstones, gapless and gapped, at small 3-momentum. The rules governing the EFT, where the gapless Goldstones are soft while the gapped ones are slow, are those of standard nonrelativistic EFTs, like for instance nonrelativistic QED. In particular, the EFT Lagrangian formally preserves gapped Goldstone number, and processes where such number is not conserved are described inclusively by allowing for imaginary parts in the Wilson coefficients. Thus, while the symmetry is manifestly realized in the EFT, unitarity is not. We comment on the application of our construction to the study of the large charge sector of conformal field theories with non-Abelian symmetries.
description: 32 pages+appendices, 3 figures, v2 matches journal version
Helioseismic Probing of Solar Variability: The Formalism and Simple Asses sments
Creators: name: Dziembowski, W. A.
name: Goode, P. R.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We derive formulae connecting the frequency variations in the spectrum of solar oscillations to the dynamical quantities that are expected to change over the solar activity cycle. This is done for both centroids and the asymmetric part of the fine structure (so-called even-a coefficients). We consider the near-surface, small-scale magnetic and turbulent velocity fields, as well as horizontal magnetic fields buried near the base of the convective zone. For the centroids we also discuss the effect of temperature variation. We demonstrate that there is a full, one-to-one correspondence between the expansion coefficients of the fine structure and those of both the averaged small-scale velocity and magnetic fields. Measured changes in the centroid frequencies and the even-a's over the rising phase solar cycle may be accounted for by a decrease in the turbulent velocity of order 1%. We show that the mean temperature decrease associated with the net decrease in the efficiency of convective transport may also significantly contribute to the increase of the centroid frequencies. Alternatively, the increase may be accounted for by an increase of the small-scale magnetic field of order 100 G, if the growing field is predominantly radial. We also show that global seismology can be used to detect a field at the level of a few times 10^5 G, if such a field were present and confined to a thin layer near the base of the convective envelope.
description: ApJ, accepted
Spätglazial und Holozän auf der Stolzenauer Terrasse im Mittelwesertal
Creators: name: Lipps, Susanne
name: Caspers, Gerfried
Publisher: name: Geozon Science Media
Year: 1990

description: 1. Der Umschwung vom "braided river" zum mäandrierenden Fluß hat an der Mittelweser bei Stolzenau spätestens während des Alleröds, vielleicht schon während des Böllings stattgefunden. Im Alleröd kam es bereits zur Ablagerung eines Hochflut-/Auelehms durch einen mäandrierenden Fluß. Die großen, mäanderförmigen Paläorinnen auf der Stolzenauer Terrasse sind durchweg im Spätglazial entstanden. Das höhere Niveau der Stolzenauer Terrasse stellt ein Übergangsstadium zwischen der eigentlichen Niederterrasse (durch einen "braided river" aufgeschüttet) und der spätglazialen Stolzenauer Terrasse dar. Das höhere Niveau ist ebenfalls mindestens im Spätglazial entstanden. 2. Bis ins Präboreal hinein kam es in den Rinnen der Stolzenauer Terrasse zur Bildung von Mudden und Torfen. Der Anteil organischer Substanz in den Mudden ist verhältnismäßig hoch. Unterhalb einer Entkalkungstiefe von 2 m enthalten die Mudden um 5% Kalk. Auf den Flächen kam es zu Hochflut-/Auelehmablagerung. Diese ist auf die nähere Umgebung der Paläorinnen begrenzt. 3. Boreal und älteres Atlantikum sind Zeiten relativer Ruhe. Aus diesen Zeiten sind nur wenige Sedimente überliefert, auch die Torfbildung war gering. Im ausgehenden Atlantikum kam es dann zu einer Erosionsphase, in deren Verlauf sich die Weser um etwa 3 m in die Stolzenauer Terrasse eintiefte; die heutige Weseraue entstand. 4. Auf der Stolzenauer Terrasse wurden in den Paläorinnen vom jüngeren Atlantikum bis in die vorrömische Eisenzeit hinein Torfe und Mudden mit hohem Anteil organischer Substanz abgesetzt. Mit der Bronzezeit setzte dann in der Weseraue die Auelehm-Sedimentation ein. Um die Zeitwende herum trat wieder eine Ruhephase ein, und es kam zu einer weiteren, geringfügigen Erosion. 5. Mit dem Beginn des Mittelalters setzte eine starke Sedimentation sowohl in der Aue als auch auf der Stolzenauer Terrasse ein. Während des Mittelalters und teilweise noch in der Neuzeit wurden wesentlich mehr feinklastische Sedimente abgesetzt als in den vorangegangenen Abschnitten des Spätglazials und Holozäns. Der organische Anteil in den Mudden ist gering. Torfbildung ist selten. In den Paläorinnen der Stolzenauer Terrasse kam es, wie auch schon im Subboreal, zu Erosionserscheinungen mit nachfolgender Muddesedimentation. Eine kontinuierliche Auelehmsedimentation fand nur in der Talaue statt. Auf der Stolzenauer Terrasse kam es nur im ausgehenden Mittelalter, bedingt durch außerordentliche Hochwässer, zu einer Auelehmsedimentation in der näheren Umgebung der Rinnen.
description: research
Graphic Method for Arbitrary $n$-body Phase Space
Creators: name: Jing, Hao-Jie
name: Shen, Chao-Wei
name: Guo, Feng-Kun
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In quantum field theory, the phase space integration is an essential part in all theoretical calculations of cross sections and decay widths. It is also needed for computing the imaginary part of a physical amplitude. A key problem is to get the phase space formula expressed in terms of any chosen invariant masses in an $n$-body system. We propose a graphic method to quickly get the phase space formula of any given invariant masses intuitively for an arbitrary $n$-body system in general $D$-dimensional spacetime, with the involved momenta in any reference frame. The method also greatly simplifies the phase space calculation just as what Feynman diagrams do in calculating scattering amplitudes.
description: More explanations, generalization to the general spacetime dimensions included
Statistical Probes of Reionization With 21 cm Tomography
Creators: name: Furlanetto, Steven
name: Zaldarriaga, Matias
name: Hernquist, Lars
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the degree to which "21 cm tomography" of the high-redshift Universe can distinguish different ionization histories. Using a new analytic model for the size distribution of HII regions that associates these ionized bubbles with large-scale galaxy overdensities, we compute the angular power spectrum and other statistical properties of the 21 cm brightness temperature during reionization. We show that the HII regions imprint features on the power spectrum that allow us to separate histories with discrete bubbles from those with partial uniform ionization (by, for example, X-rays). We also show that "double reionization" scenarios will modify the morphology of the bubbles in ways that depend on the mechanism through which the first generation of sources shuts off. If, for example, the transition occurs globally at a fixed redshift, the first generation imprints a persistent feature on the 21 cm power spectrum. Finally, we compare our model to one in which voids are ionized first. While the power spectra of these two models are qualitatively similar, we show that the underlying distributions of neutral hydrogen differ dramatically and suggest that other statistical tests can distinguish them. The next generation of low-frequency radio telescopes will have the sensitivity to distinguish all of these models and strongly constrain the history and morphology of reionization.
description: 6 pages, 4 figures, submitted to ApJ
Two-neutron halo structure of $^{31}$F and a novel pairing anti-halo effect
Creators: name: Masui, H.
name: Horiuchi, W.
name: Kimura, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Background: A newly identified dripline nucleus $^{31}$F offers a unique opportunity to study the two-neutron ($2n$) correlation at the east shore of the island of inversion where the $N = 28$ shell closure is lost. Purpose: We aim to present the first three-body theoretical results for the radius and total reaction cross sections of $^{31}$F. This will further help to investigate how the pairing and breakdown of the $N = 28$ shell closure influence the formation of the $2n$-halo structure and the anti-halo effect in this mass region. Methods: A $^{29}$F$+n+n$ three-body system is described by the cluster orbital shell model, and its total reaction cross section is calculated by the Glauber theory. Results: Our three-body calculations predict 3.48-3.70 fm for the root-mean-square radius of $^{31}$F, which corresponds to the total reaction cross section of 1530 (1410)-1640 (1500) mb for a carbon target at 240 (900) MeV/nucleon. The binding mechanism and halo formation in $^{31}$F are discussed. Conclusions: The present study suggests a novel anti-halo effect in this mass region: When the pairing overcome the energy gap between the $p_{3/2}$ and $f_{7/2}$ orbits, the inversion of the occupation number of these orbits takes place, and it diminishes the $2n$-halo structure.
description: 6 pages, 3 figures
Excited nucleons with chirally improved fermions
Creators: name: Broemmel, Dirk
name: Crompton, Peter
name: Gattringer, Christof
name: Glozman, Leonid Ya.
name: Lang, C. B.
name: Schaefer, Stefan
name: Schaefer, Andreas
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study positive and negative parity nucleons on the lattice using the chirally improved lattice Dirac operator. Our analysis is based on a set of three operators chi_i with the nucleon quantum numbers but in different representations of the chiral group and with different diquark content. We use a variational method to separate ground state and excited states and determine the mixing coefficients for the optimal nucleon operators in terms of the chi_i. We clearly identify the negative parity resonances N(1535) and N(1650) and their masses agree well with experimental data. The mass of the observed excited positive parity state is too high to be interpreted as the Roper state. Our results for the mixing coefficients indicate that chiral symmetry is important for N(1535) and N(1650) states. We confront our data for the mixing coefficients with quark models and provide insights into the physics of the nucleon system and the nature of strong decays.
description: Tables added, small modifications in the text
Review of low-cost sensors for indoor air quality: Features and applications
Creators: name: García, Milagros Ródenas
name: Spinazzé, Andrea
name: Branco, Pedro T.B.S.
name: Borghi, Francesca
name: Villena, Guillermo
name: Cattaneo, Andrea
name: Di Gilio, Alessia
name: Mihucz, Victor G.
name: Álvarez, Elena Gómez
name: Lopes, Sérgio Ivan
name: Bergmans, Benjamin
name: Orłowski, Cezary
name: Karatzas, Kostas
name: Marques, Gonçalo
name: Saffell, John
name: Sousa, Sofia I.V.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Space Science
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: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy

description: Humans spend the majority of their time indoors, where they are potentially exposed to hazardous pollutants. Within this context, over the past few years, there has been an upsurge of low-cost sensors (LCS) for the measurement of indoor air pollutants, motivated both by recent technological advances and by increased awareness of indoor air quality (IAQ) and its potential negative health impacts. Although not meeting the performance requirements for reference regulatory-equivalent monitoring indoors, LCS can provide informative measurements, offering an opportunity for high-resolution monitoring, emission source identification, exposure mitigation and managing IAQ and energy efficiency, among others. This article discusses the strengths and limitations that LCS offer for applications in the field of IAQ monitoring; it provides an overview of existing sensor technologies and gives recommendations for different indoor applications, considering their performance in the complex indoor environment and discussing future trends.
title: The mechanisms and timing of mineralization of fossil phosphatized soft tissues
Creators: name: Wilby, Philip Richard
Publisher: name: The Open University
Year: 1993

description: Fossil phosphatized soft tissues offer palaeontologists a unique opportunity to examine the biology and physiology of extinct organisms at the cellular and even macromolecular level. All phosphatized soft tissues are preserved by one or more of three preservational styles. These are: 1) phosphatized microbial infestations, 2) non-microbial (i. e. inorganic) phosphatic coatings, and 3) inorganic replacements. This suggests that three different (but related) processes are involved in the phosphatization of soft tissues. Each of these processes preserves the tissues at a predictable resolution; the most detailed preservation being afforded by inorganic replacements. In general, the soft tissues of closely related organisms have similar preservational styles. This reflects similarities in the biochemistry and taphonomy of closely related taxa. In the majority of cases of soft tissue phosphatization, the most important source of phosphorus appears to have been external to the organism undergoing mineralization. An accessible source of phosphorus is, however, not the only variable dictating mineralization; phosphatization is extremely taxon-, tissue-, and biomolecule-specific. Of particular importance is: a) the concentration of phosphorus in the organism's soft tissues; b) the tissue's proximity to the source of phosphorus; c) the rate of tissue decay relative to the onset of mineralization; and, d) the pH and chemical composition of the decay-induced microenvironment surrounding the carcass. Certain groups of organisms (e. g. crustaceans, squid, and fish) appear to be somewhat 'preconditioned' for phosphatization. All fossil phosphatized soft tissues exhibit evidence of decay. Taphonomic experiments suggest the period between death and phosphatization to have been as little as 55 hours. In the case of microbial infestation, decay would have permitted the microbes to gain access to the carcass, and to release organically-bound phosphorus from its tissues. In inorganic phosphatization, decay stimulates mineralization by: a) degrading membranes and thus accelerating the rate at which dissolved phosphorus and calcium may invade the tissues; b) creating new "reactive" organic substrates on which apatite may precipitate; c) destroying intracellular nucleation inhibitors; and, d) creating a favourable chemical microenvironment for the precipitation of apatite. Inorganic postmortem phosphatization may therefore be considered to be an "end-member" of pathological biomineralization.
title: 01_2330
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Interrelation of geomorphology and fauna of Lavrado region in Roraima, Brazil – suggestions for future studies
Creators: name: Carvalho, De
name: Carvalho, De
Publisher: name: Geozon Science Media
Year: 2012

description: In der vorgelegten Arbeit wird die Abhängigkeit von Geomorphologie und biologischen Interaktion unter Verwendung des Konzeptes morphoklimatischer Regionen Brasiliens vorgestellt. Die Diskussion fokussiert hierbei auf biogeographische und ökologische Aspekte. Die vorgelegte Studie wurde in den offenen Bereichen von Roraima – Lavrado – zwischen Brasilien, Venezuela und Guyana durchgeführt. Dieses Gebiet liegt im nördlichen Teil der morphoklimatischen Region Amazoniens. Zur Anwendung kamen Techniken der Fernerkundung, um das Relief der Region zu ermitteln und biologische Charakterisierungen durchzuführen. Die hierdurch erzielten Ergebnisse wurden genutzt, um Lebensräume der Region und die Verteilung der Lavrado Fauna zu beschreiben.
description: research
Der prähistorische Bergsturz von Pfannes/Südtirol (Italien)
Creators: name: Hering, Gerd
name: Langheinrich, Gunter
name: Wilczewski, Norbert
Publisher: name: Geozon Science Media
Year: 1992

description: Im Rahmen einer geologischen Diplomarbeit der Universität Göttingen wurde 1986 eine Kartierung des Bergsturzes von Pfannes im Pfitschtal / Südtirol (Provinz Bozen, Italien) durchgeführt. Die Bergsturzmassen wurden dabei petrographisch untersucht. Die Ursache des prähistorischen Bergsturzes wird in Übereinstimmung mit Klebelsberg (1953) darin gesehen, daß nach dem Abschmelzen des jüngsten quartären Talgletschers das Widerlager für die unterschnittene Talseite („Prallhang") verlorenging. Die Ablösung der Bergsturzmassen erfolgte an zahlreichen tektonisch bestimmten Grenzflächen und nicht einheitlich an einer großen Bruchfläche.
description: research
Investigations of the Core Structure of Magnetic Vortices in Type-II Superconductors by muSR
Creators: name: Sonier, J. E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Muon spin rotation (muSR) has emerged as the leading experimental probe of the effective size of magnetic vortices in type-II superconductors. muSR data on several different classes of type-II superconductors shows that the inner structure of a vortex can depend quite strongly on temperature and the strength of the external magnetic field. In this paper it is shown that these behaviours are related to the quasiparticle excitation spectrum both inside and outside of the vortex cores. Here we establish that the vortex-core size determined by muSR is particularly sensitive to the nature of the superconducting energy gap(s) and the symmetry of the Fermi surface. A survey of results for different superconductors arrives at the conclusion that the large vortex-core size observed by muSR in YBa2Cu3O6.95 is due to CuO chain superconductivity.
description: 17 pages, To be published in a special issue of J. Phys. Cond. Mat
Regulation of human BACE1 gene expression by NF-kappa B signaling
Creators: name: Chen, Chia-Hsiung Alan
Publisher: name: University of British Columbia
Year: 2011

description: Nuclear Factor-Kappa B (NF-κB) signaling plays an important role in gene regulation and is implicated in cell apoptosis, inflammation and oxidative stress. Binding of Inhibitor of Kappa B (IκB) to NF-κB dimers, mostly RelA (p65)/p50, causes the dimers to be sequestered in cytoplasm and remain inactive. When NF-κB-activating stimuli activate the Inhibitor of Kappa B Kinase (IKK) complex, IKK phosphorylates IκB , and NF-κB is released and translocates to the nucleus, where it interacts with NF-κB binding elements in the promoter of NF-κB target genes to modulate gene expression. One of the hallmark neuropathological features of Alzheimer's disease (AD) is the senile plaques formed by the deposition of amyloid-β peptide (Aβ) in the brain. Aβgeneration is achieved by sequential proteolytic cleavage of β-amyloid precursor protein (APP) by β-site APP cleaving enzyme (BACE1) and y-secretase. Regulation of BACE1 activity is efficient to modify Aβ production and BACE1 inhibition has become a potential target in AD treatment. BACE1 is reported to be tightly regulated at both the transcriptional and translational level. Several putative NF-κB binding elements in the human BACE1 promoter region have been identified, but the precise role of NF-κB in BACE1 gene expression remains to be defined. To investigate whether NF-KB modulates BACE1 gene expression, we first identified functional NF-κB binding elements in the BACE1 promoter region. Co-expression of NF-κB p65 and BACE1 reporter plasmid in HEK293 cells resulted in increased BACE1 promoter activity and dual-luciferase reporter assays and RT-PCR analysis revealed that N F-κB p65 regulates BACE1 gene at the transcriptional level. Neurons are speculated to be the major source of AP generation, contributing to the elevated Ap burden in AD pathogenesis, and NF- KB p65 was also demonstrated to elevate BACE1 promoter activity in neuronal-like cells. In addition, NF-κB p65 overexpression leads to elevation of C99 protein levels and increased production of Aβ40. Therefore, our results show that by modulating NF-κB signalling, BACE1 gene transcription is regulated and amyloidogenic APP processing is altered
Semi-supervised source localization with deep generative modeling
Creators: name: Bianco, Michael J.
name: Gannot, Sharon
name: Gerstoft, Peter
Publisher: name: arXiv
Year: 2020
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Machine Learning (cs.LG)
subject: Sound (cs.SD)
subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We propose a semi-supervised localization approach based on deep generative modeling with variational autoencoders (VAEs). Localization in reverberant environments remains a challenge, which machine learning (ML) has shown promise in addressing. Even with large data volumes, the number of labels available for supervised learning in reverberant environments is usually small. We address this issue by performing semi-supervised learning (SSL) with convolutional VAEs. The VAE is trained to generate the phase of relative transfer functions (RTFs), in parallel with a DOA classifier, on both labeled and unlabeled RTF samples. The VAE-SSL approach is compared with SRP-PHAT and fully-supervised CNNs. We find that VAE-SSL can outperform both SRP-PHAT and CNN in label-limited scenarios.
description: Published in proceedings of IEEE International Workshop on Machine Learning for Signal Processing. arXiv admin note: substantial text overlap with arXiv:2101.10636
Heavy quark masses from finite volume effects
Creators: name: Tantalo, Nazario
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: I discuss the results of a new calculation of the charm and bottom quark masses in the quenched approximation and in the continuum limit of lattice QCD. The work has been done by the APE group at the ``Tor Vergata'' University making use of the step scaling method, previously introduced to deal with two scale problems, that allows to take the continuum limit of the lattice data. We have computed the RGI quark masses and then we have connected the results to the MSbar scheme. The continuum numbers are m_b^{RGI} = 6.73(16) GeV for the b-quark and m_c^{RGI} = 1.681(36) GeV for the c-quark, corresponding respectively to m_b^{MSbar}(m_b^{MSbar}) = 4.33(10) GeV and m_c^{MSbar}(m_c^{MSbar}) = 1.319(28) GeV. The latter result, in agreement with current estimates, is for us a check of the method.
description: 3 pages, 2 figures, Lattice2003(heavy)
Achieving 50 femtosecond resolution in MeV ultrafast electron diffraction with a double bend achromat compressor
Creators: name: Qi, Fengfeng
name: Ma, Zhuoran
name: Zhao, Lingrong
name: Cheng, Yun
name: Jiang, Wenxiang
name: Lu, Chao
name: Jiang, Tao
name: Qian, Dong
name: Wang, Zhe
name: Zhang, Wentao
name: Zhu, Pengfei
name: Zou, Xiao
name: Wan, Weishi
name: Xiang, Dao
name: Zhang, Jie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: We propose and demonstrate a novel scheme to produce ultrashort and ultrastable MeV electron beam. In this scheme, the electron beam produced in a photocathode radio-frequency (rf) gun first expands under its own Coulomb force with which a positive energy chirp is imprinted in the beam longitudinal phase space. The beam is then sent through a double bend achromat with positive longitudinal dispersion where electrons at the bunch tail with lower energies follow shorter paths and thus catch up with the bunch head, leading to longitudinal bunch compression. We show that with optimized parameter sets, the whole beam path from the electron source to the compression point can be made isochronous such that the time of flight for the electron beam is immune to the fluctuations of rf amplitude. With a laser-driven THz deflector, the bunch length and arrival time jitter for a 20 fC beam after bunch compression are measured to be about 29 fs (FWHM) and 22 fs (FWHM), respectively. Such an ultrashort and ultrastable electron beam allows us to achieve 50 femtosecond (FWHM) resolution in MeV ultrafast electron diffraction where lattice oscillation at 2.6 THz corresponding to Bismuth A1g mode is clearly observed without correcting both the short-term timing jitter and long-term timing drift. Furthermore, oscillating weak diffuse scattering signal related to phonon coupling and decay is also clearly resolved thanks to the improved temporal resolution and increased electron flux. We expect that this technique will have a strong impact in emerging ultrashort electron beam based facilities and applications.
description: Accepted for publication in Physical Review Leters
Hard Loops, Soft Loops, and High Density Effective Field Theory
Creators: name: Schaefer, Thomas
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study several issues related to the use of effective field theories in QCD at large baryon density. We show that the power counting is complicated by the appearance of two scales inside loop integrals. Hard dense loops involve the large scale $μ^2$ and lead to phenomena such as screening and damping at the scale $gμ$. Soft loops only involve small scales and lead to superfluidity and non-Fermi liquid behavior at exponentially small scales. Four-fermion operators in the effective theory are suppressed by powers of $1/μ$, but they get enhanced by hard loops. As a consequence their contribution to the pairing gap is only suppressed by powers of the coupling constant, and not powers of $1/μ$. We determine the coefficients of four-fermion operators in the effective theory by matching quark-quark scattering amplitudes. Finally, we introduce a perturbative scheme for computing corrections to the gap parameter in the superfluid phase
description: 26 pages
title: The cultural context of the theories of Heinrich Schenker
Creators: name: Whittle, Barbara
Publisher: name: The Open University
Year: 1994

description: The thesis presents Schenker's theory of musical structure as grounded in the (mainly pedagogic) music theory and practice of the eighteenth century, like the music of the period of German classicism to which it relates. It argues that Scheriker was right to see his theory as having a wider significance than the strictly music-theoretical, and that the music-structural concept which he elaborated and codified is inseparable from the work as a whole. Set apart from the aesthetic and cultural outlook from which it emerged, the historical and critical studies of the repertory and of the theoretical literature, it may still be usable, but it is profoundly impoverished and loses the very particular meaning it had for Schenker. The thesis proposes that while Schenker' s formulation of his structural concept is unique,. the concept itself is not, but was a cultural property which Schenker re-discovered and that it is in this re-discovery as much as in the thing itself that the significance of his work resides. The view of Schenker as an eccentric is counterbalanced by a picture of a thinker moulded by experiences anything but unique to him, but, nevertheless unique to a particular historical phase. It is suggested that in the absence of a minimal degree of understanding of this phase and these experiences no judgement of Schenker as thinker,' writer, even musician, can properly be made. Chapter One gives a brief account of Schenker' s career. Chapter Two attempts to define a context for his exploration of eighteenth- and nineteenth-century pedagogic theory. Chapter Three attempts to dispose of sane mid-century shibboleths inhibiting understanding of Schenker. Chapter Four explores the radical changes in the character of musical scholarship taking place in Schenker' s lifetime, relating these to developments in other fields, especially in philology, and considers their effect on him. Chapter Five considers Schenker' s attitude towards aesthetic and scientific theories in circulation in his day and their contribution to the formulation of his music-structural concept and its development. The main focus of this chapter is the metaphysics of music of Schopenhauer. Chapter Six examines sane of the problems arising from Schenker' S historical-cultural situation and considers the enabling role played for him by the work of Nietzsche.
Engineering superpositions of displaced number states of a trapped ion
Creators: name: Marchiolli, Marcelo A.
name: Jose, Wagner D.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a protocol that permits the generation of a subtle with superposition with 2^(l+1) displaced number states on a circle in phase space as target state for the center-of-mass motion of a trapped ion. Through a sequence of 'l' cycles involving the application of laser pulses and no-fluorescence measurements, explicit expressions for the total duration of laser pulses employed in the sequence and probability of getting the ion in the upper electronic state during the 'l' cycles are obtained and analyzed in detail. Furthermore, assuming that the effective relaxation process of a trapped ion can be described in the framework of the standard master equation for the damped harmonic oscillator, we investigate the degradation of the quantum interference effects inherent to superpositions via Wigner function.
description: 14 pages, 10 figures
La Tephra de Bag: une retombée volcanique à large dispersion dans le loess pléistocène d'Europe centrale
Creators: name: Juvigné, Etienne
name: Horváth, Elisabeth
name: Gábris, Gyula
Publisher: name: Geozon Science Media
Year: 1991

description: Mehrere Eigenschaften (Korngröße, Mineralspektrum, chemische Zusammensetzung von Gesamtproben und von Klinopyroxenen) einer Tephralage, die in sieben Lößprofilen von Ungarn und der Tschechoslovakei vorkommt, wurden untersucht. Die Tephra ist identisch in allen Lokalitäten, und der Name „Tephra von Bag" wurde gewählt. Diese Tephra erlaubt eine neue Korrelation der untersuchten Lößprofile. Die Ablagerung der Tephra hat während oder vor der fünftletzten Eiszeit stattgefunden. Da sich die nächsten vulkanischen pleistozänen Felder in einer Entfernung von mehr als 500 km befanden, kann die Tephra von Bag als weitverbreiteter Leithorizont in Zentraleuropa angesehen werden. Die zur Zeit verfügbaren Angaben erlauben die Schlußfolgerungen, daß der fördernde Vulkan sich eher in der Osteifel (Deutschland) als in dem Apennin (Italien) oder in den Karpaten (Rumänien) befindet. Die Korrelation mit einem Vulkan vom Zentral-Massiv (Frankreich) oder vom Agäischen Meer (Griechenland) wird ausgeschlossen.
description: research
Aspects of BFKL physics at HERA
Creators: name: Jung, Hannes
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: parton: density
small-x
BFKL equation
DESY HERA Stor
phase space
transverse momentum dependence
flavor

description: Aspects of small x physics at HERA are discussed in honor of the work of Lev Lipatov, who influenced and motivated a whole generation of physicists to investigate this new region of phase space. The introduction of transverse momentum dependent parton densities is one of the essential aspects of small x and BFKL physics, and its extension to all flavors with application to various processes marks a new milestone.
Geometric optimisation of quantum thermodynamic processes
Creators: name: Abiuso, Paolo
name: Miller, Harry J. D.
name: Perarnau-Llobet, Martí
name: Scandi, Matteo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Differential geometry offers a powerful framework for optimising and characterising finite-time thermodynamic processes, both classical and quantum. Here, we start by a pedagogical introduction to the notion of thermodynamic length. We review and connect different frameworks where it emerges in the quantum regime: adiabatically driven closed systems, time-dependent Lindblad master equations, and discrete processes. A geometric lower bound on entropy production in finitetime is then presented, which represents a quantum generalisation of the original classical bound. Following this, we review and develop some general principles for the optimisation of thermodynamic processes in the linear-response regime. These include constant speed of control variation according to the thermodynamic metric, absence of quantum coherence, and optimality of small cycles around the point of maximal ratio between heat capacity and relaxation time for Carnot engines.
description: Published in the special issue "Finite-Time Thermodynamics" of Entropy edited by S. Berry, P. Salamon, and B. Andresen v3: Typo corrected in Eq. (49)
Mid-chain branched alkanoic acids from "living fossil" demosponges: a link to ancient sedimentary lipids?
Creators: name: Thiel, Volker
name: Jenisch, Angela
name: Wörheide, Gert
name: Löwenberg, Antje
name: Reitner, Joachim
name: Michaelis, Walter
Publisher: name: FID GEO
Year: 1999

description: The lipid assemblages of the "living fossil" stromatoporoid Astrosclera willeyana (Great Barrier Reet) and the demosponge Agelas aroides (Mediterranean Sea) were investigated. Large amounts of branched carboxylic acids are present in the sponges studied. These compounds include terminally branched carboxylic acids (isa -/anteisa-) and abundant mid-chain branched carboxylic acids (MBCA) wh ich are characterized by an intriguing variety of structural isomers present in the C 15- C25 range. The most prominent MBCA are comprised of isomeric methylhexadecanoic acids and methyloctadecanoic acids. A second cluster of MBCA includes methyldocosanoic acids and methyltetracosanoic acids, but other homologues are also present. Methyl branching points were generally observed between the w5- and w9-positions. These complex isomeric mixtures apparently derive from symbiotic bacteria living exclusively in demosponges. Comparison with hydrocarbon compositions of ancient carbonates reveals evidence that the MBCA found are potential lipid precursors of mid-chain branched monomethylalkanes often observed in fossil sediments and oils. As a working hypo thesis, we suggest that their bacterial source organisms have been widespread in the geological past, and are found " inherited" in the protective environment of distinctive sponge hosts in recent marine ecosystems. Furthermore, both sponges contain abundant linear, longchain C24- C26 dienoic "demospongic" acids. The demospongic acid distribution and the presence of phytanic acid in A. willeyana match the patterns found in A. aroides and other members of the Agelasida. These findings confirm the systematic position of A. willeyana within this demosponge taxon.
Trion induced photoluminescence of a doped MoS2 monolayer
Creators: name: Zhumagulov, Yaroslav V.
name: Vagov, Alexei
name: Junior, Paulo E. Faria
name: Gulevich, Dmitry R.
name: Perebeinos, Vasili
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We demonstrate that the temperature and doping dependencies of the photoluminescence (PL) spectra of a doped MoS2 monolayer have several peculiar characteristics defined by trion radiative decay. While only zero-momentum exciton states are coupled to light, radiative recombination of non-zero momentum trions is also allowed. This leads to an asymmetric broadening of the trion spectral peak and redshift of the emitted light with increasing temperature. The lowest energy trion state is dark, which is manifested by the sharply non-monotonic temperature dependence of the PL intensity. Our calculations combine the Dirac model for the single-particle states, the parameters for which are obtained from the first principle calculations, and the direct solution of the three-particle problem within the Tamm-Dancoff approximation. The numerical results are well captured by a simple model that yields analytical expressions for the temperature dependencies of the PL spectra.
description: 10 pages, 6 figures
Vortex description of the fractionalized phase in exciton bose condensate
Creators: name: Lee, Sung-Sik
name: Senthil, T.
name: Lee, Patrick A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: As a sequel to the previous work [Phys. Rev. B 72, 235104 (2005)] we present a vortex description of the fractionalized phase in exciton bose condensate. Magnetic flux line and monopole of the 3+1D emergent U(1) gauge theory are identified in the exciton picture. A bundle of vortex/anti-vortex pairs of all flavors of excitons corresponds to the magnetic flux line and a point at which the vortices and anti-vortices recombine is identified as magnetic monopole. This completes the magnetic sector of the low energy excitation in the fractionalized phase.
description: 8 pages, 6 figures; clarification made in introduction
Produkty sojowe w opinii konsumentów Trójmiasta
SOY PRODUCTS IN THE TRI-CITY CONSUMERS’ OPINION
Creators: name: Rybowska, Agnieszka
name: Rybowska, Agnieszka
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agribusiness
subject: biogospodarka
subject: postawy konsumentów
subject: produkty sojowe
subject: soja

description: The aim of the study was to investigate consumers’ opinion about the food soy products, which may be an argument for the cultivation of soybeans in Poland. The subject of research were soy products and their perception by consumers. There has been used the method of direct research. The study was conducted among 188 consumers of soy products from Tricity. It has been demonstrated consumer interest in these products. According to the respondents the main advantages of these products are health benefits and ease of preparation. Barrier to their purchase is a low availability of the product on the market.
Analysis of interworking architectures for IP multimedia subsystem
Creators: name: Munir, Arslan
Publisher: name: University of British Columbia
Year: 2011

description: The future fourth generation wireless heterogeneous networks aim to integrate various wireless access technologies and to support the IMS (IP multimedia subsystem) sessions. In the first part of this thesis, we propose the Loosely Coupled Satellite-Cellular- WiMax-WLAN (LCSCW2) and the Tightly Coupled Satellite-Cellular-WiMax-WLAN (TCSCW2) interworking architectures. The LCSCW2 and TCSCW2 architectures use the loosely coupling and tightly coupling approach respectively and both of them integrate the satellite networks, 3rd generation (3G) wireless networks, worldwide interoperability for microwave access (WiMax), and wireless local area networks (WLANs). They can support IMS sessions and provide global coverage. The LCSCW2 architecture facilitates independent deployment and traffic engineering of various access networks. The TC-SCW2 aims to guarantee quality of service (QoS). We also propose an analytical model to determine the associate cost for the signaling and data traffic for inter-system communication in the LCSCW2 and TCSCW2 architectures. The cost analysis includes the transmission, processing, and queueing costs at various entities. Numerical results are presented for different arrival rates and session lengths. In the second part of this thesis, the signaling flows for IMS registration, IMS session establishment and IMS session re-establishment procedure after undergoing a vertical handoff in a 4 G environment are analyzed. Signaling delays are calculated for IMS signaling taking into account transmission, processing and queueing delays at network entities. The proposed analysis of the IMS signaling flows is independent of a particular access network technology and interworking architecture and can be applied to any of the access network technology and 4G interworking architecture.
Kapitał ludzki w rozwoju gospodarstw agroturystycznych wschodniego Mazowsza
HUMAN CAPITAL IN DEVELOPMENT OF EASTERN MAZOVIA’S AGROTOURISM FARMS
Creators: name: Sieczko, Anna
name: Sieczko, Anna
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agribusiness
subject: agroturystyka
subject: kapitał ludzki
subject: rozwój gospodarstw agroturystycznych

description: The purpose of this study was to determine potential of agrotourism farm development. Due to the complexity of human capital it was assumed, based on available literature, that the impact on agrotourism farm development have: owner’s education, knowledge of foreign languages, variety of services, marketing skills, investments planning and membership in associations. The source material were results of the survey conducted among 24 agrotourism farms locate in the east of Mazowieckie region. The research shows that human capital have impact on agrotourism farm development.