cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Bayesian Multiscale Deep Learning Framework for Flows in Random Media
Creators: name: Padmanabha, Govinda Anantha
name: Zabaras, Nicholas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: 68T07

description: Fine-scale simulation of complex systems governed by multiscale partial differential equations (PDEs) is computationally expensive and various multiscale methods have been developed for addressing such problems. In addition, it is challenging to develop accurate surrogate and uncertainty quantification models for high-dimensional problems governed by stochastic multiscale PDEs using limited training data. In this work to address these challenges, we introduce a novel hybrid deep-learning and multiscale approach for stochastic multiscale PDEs with limited training data. For demonstration purposes, we focus on a porous media flow problem. We use an image-to-image supervised deep learning model to learn the mapping between the input permeability field and the multiscale basis functions. We introduce a Bayesian approach to this hybrid framework to allow us to perform uncertainty quantification and propagation tasks. The performance of this hybrid approach is evaluated with varying intrinsic dimensionality of the permeability field. Numerical results indicate that the hybrid network can efficiently predict well for high-dimensional inputs.
description: 54 pages, 50 figures
Η προστασία των μεταναστών στην έννομη τάξη του Ο.Η.Ε.
Creators: name: Λιόλιου, Αθηνά Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: προστασία μεταναστών
Διεθνών Σπουδών
ΟΗΕ
protection of immigrants
International Studies
United Nations

description: Η παρούσα μελέτη εξέτασε το άκρως επίκαιρο και εξαιρετικά ενδιαφέρον, για τη διεθνή, περιφερειακή και εσωτερική έννομη τάξη, θέμα της προστασίας των μεταναστών. Εκκινώντας από την απόπειρα να δοθεί ένας σαφής ορισμός στον όρο μετανάστη, κατανοούμε τη δυσκολία της ερμηνείας και αποτίμησης της προστασίας των μεταναστών εν συνόλω στην έννομη τάξη του Ο.Η.Ε., υπό το πρίσμα μάλιστα των διεθνών εξελίξεων και των ολοένα κλιμακούμενων αλλαγών και μεταναστευτικών εισροών στα πλαίσια του διεθνοποιημένου και παγκοσμιοποιημένου σύγχρονου κόσμου, με τις συνεχείς αλλαγές στο πολιτικοκοινωνικό σκηνικό αλλά και τις διαρκείς ανθρώπινες μετακινήσεις από και προς την επικράτεια των κρατών των Ηνωμένων Εθνών. Επεδίωξε να επικεντρωθεί στην προστασία των μεταναστών σε θεσμικό και νομικό επίπεδο στην έννομη τάξη του Ο.Η.Ε., μέσα από μια ανάλυση των βασικών θεσμικών πρωτοβουλιών, των συμβάσεων και νομικών κειμένων που έχουν συναφθεί στην κατεύθυνση αυτή, αλλά και να ψηλαφίσει τα αιχμηρά ζητήματα αυτού του φαινομένου που αναζητούν επίλυση, στα πλαίσια ανάλυσης νομικών φαινομένων και ερωτημάτων του διεθνοποιημένου περιβάλλοντος, όπου οι μεταναστευτικές ροές πιέζουν σε εθνικό, ευρωπαϊκό και υπερεθνικό επίπεδο για την κατοχύρωση και εξασφάλιση των ανθρώπινων δικαιωμάτων των μεταναστών/ριών
description: The present thesis tried to analyze the extremely topical and interesting, regarding the international, European and national legal system, topic of the protection of immigrants. Starting from the try to give a specific definition to who is migrant, we can immediately understand the difficulty of the interpretation of the protection of the migrants at the legal system of the United Nations in general, especially taking into consideration the international changes and the constantly increasing migratory flows at the frame of the globalization, with the constant changes at the social and political scenery and the movements of people-from and to-the territory of the members of the United Nations. The thesis tried to focus on the protection of the immigrants at an institutional and legal framework of the United Nations, through an analysis of the basic institutional initiatives , Conventions and international legal instruments at that direction and study the sharp edges of that phenomenon, based at the analysis of legal questions of the globalized legal environment, where the migratory flows press at an international, European and national basis , for the enforcement and protection of the immigrants
Quantum Andreev Oscillations in normal-superconducting-normal nanostructures
Creators: name: Rödiger, P.
name: Esquinazi, P.
name: García, N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We show that the voltage drop of specially prepared normal-superconducting-normal nanostructures show quantum Andreev oscillations as a function of magnetic field or input current. These oscillations are due to the interference of the electron wave function between the normal parts of the structure that act as reflective interfaces, i.e. our devices behave as a Fabry-Perot interferometer for conduction electrons. The observed oscillations and field periods are well explained by theory.
description: 5 pages and 4 figures
Quantum Dynamics of Electron-Nuclei Coupled System in a Double Quantum Dot
Creators: name: Cakir, Ozgur
name: Takagahara, Toshihide
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Hyperfine interaction of electron spins with nuclear spins, in coupled double quantum dots is studied. Results of successive electron spin measurements exhibit bunching due to correlations induced via the nuclear spins. Further nuclear spins can be purified via conditional electron spin measurements which lead to electron spin revivals in the conditional probabilities. The electron spin coherence time can be extended via conditional measurements. The results are extended to a single electron on a single QD.
description: presented at ICNT+T 2006 Basel
Environmental impacts of onshore hydrocarbon exploitation
Creators: name: Σπυροπούλου, Κυριακή Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Περιβάλλον
Ατύχημα
Ρίσκο
Environment
Accident
Risk

description: This thesis focuses mainly on the onshore oil activities and discusses the potential impacts on the environment, as well as the measures needed, in order to handle and restrain those impacts. More specifically, the thesis, based on a thorough literature review, examines the environmental performance of the oil industry and analyzes the environmental impacts of onshore oil activities in different stages, e.g. from the preparation of the site up to the abandonment stage, with respect to different impacts and risks. For this purpose, the findings of previous research efforts on the risk assessment and management of environmental impacts of oil activities are used in a meta-analysis. The results show that the onshore activities are of less risky than the offshore activities. Yet, a carefully designed environmental management plan is necessary so as to reduce the overall impacts at acceptable levels and create a cleaner and safer process towards sustainability.
description: Η παρούσα Μεταπτυχιακή Διπλωματική Εργασία εστιάζει στις χερσαίες δραστηριότητες της πετρελαϊκής βιομηχανίας, δίνοντας έμφαση στις περιβαλλοντικές επιπτώσεις, αλλά και στα μέτρα που πρέπει να λαμβάνονται ώστε αυτές να περιορίζονται στον ελάχιστο δυνατό βαθμό. Πιο συγκεκριμένα, εξετάζει την επίδοση της πετρελαϊκής βιομηχανίας και αναλύει τις περιβαλλοντικές επιπτώσεις στα διάφορα στάδια των χερσαίων δραστηριοτήτων, από το στάδιο προετοιμασίας του πεδίου μέχρι το στάδιο του οριστικού τερματισμού των δραστηριοτήτων. Για το λόγο αυτό, χρησιμοποιήθηκαν δεδομένα από προηγούμενες, σχετικές με την εκτίμηση του ρίσκου και τη διαχείριση των περιβαλλοντικών επιπτώσεων, έρευνες. Τα αποτελέσματα έδειξαν ότι οι δραστηριότητες στο χερσαίο περιβάλλον φέρουν μικρότερο ρίσκο από αυτές του θαλάσσιου περιβάλλοντος, αλλά και ότι το ρίσκο διακυμαίνεται από στάδιο σε στάδιο. Τέλος, κρίνεται απαραίτητη η εφαρμογή μέτρων, καθώς έτσι μειώνεται η πιθανότητα αλλά και οι συνέπειες των περιβαλλοντικών επιπτώσεων.
description: Σε συνεργασία με: Μηχανικών Μεταλλείων Μεταλλουργών (Εθνικό Μετσόβιο Πολυτεχνείο, Γεωλογίας και Γεωπεριβάλλοντος (Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών), Οικονομικών Επιστημών (Δημοκρίτειο Πανεπιστήμιο Θράκης)
Radio emission of highly inclined cosmic ray air showers measured with LOPES
Creators: name: Petrovic, J.
name: collaboration, LOPES
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: LOPES (LOFAR Prototype Station) is an array of dipole antennas used for detection of radio emission from air showers. It is co-located and triggered by the KASCADE (Karlsruhe Shower Core and Array Detector) experiment, which also provides informations about air shower properties. Even though neither LOPES nor KASCADE are completely optimized for the detection of highly inclined events, a significant number of showers with zenith angle larger than 50$^o$ have been detected in the radio domain, and many with very high field strengths. Investigation of inclined showers can give deeper insight into the nature of primary particles that initiate showers and also into the possibility that some of detected showers are triggered by neutrinos. In this paper, we show the example of such an event and present some of the characteristics of highly inclined showers detected by LOPES.
Additional file 1: of Arabidopsis thaliana alternative dehydrogenases: a potential therapy for mitochondrial complex I deficiency? Perspectives and pitfalls
Creators: name: Catania, Alessia
name: Iuso, Arcangela
name: Bouchereau, Juliette
name: Kremer, Laura
name: Paviolo, Marina
name: Terrile, Caterina
name: BĂŠnit, Paule
name: Rasmusson, Allan
name: Schwarzmayr, Thomas
name: Tiranti, Valeria
name: Rustin, Pierre
name: Rak, Malgorzata
name: Prokisch, Holger
name: Schiff, Manuel
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: Evolutionary Biology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: Supplementary methods. Supplementary results. Table S1. Expression level of AtNDA2, AtNDB4, and NADH:quinone oxidoreductase (CI) subunits in various compartment of A.thaliana. (DOCX 105 kb)
Phonological elicitation: Length and creak
Creators: name: Sales, Henry
name: Bertet, Denis
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: mam

description: Elicitation of monosyllabic words that have short vs. long vowels, and modal vs. glottalized (or "creaky") vowels, in cognate words in San Ildefonso Ixtahuacán Mam. Possessive forms of those words are elicited to detect in San Juan Atitán Mam a potential equivalent of San Ildefonso Ixtahuacán Mam's frequent vowel lengthening in possessed forms of short vowels found in unpossessed forms of words.
Low communication high performance ab initio density matrix renormalization group algorithms
Creators: name: Zhai, Huanchen
name: Chan, Garnet Kin-Lic
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: There has been recent interest in the deployment of ab initio density matrix renormalization group computations on high performance computing platforms. Here, we introduce a reformulation of the conventional distributed memory ab initio DMRG algorithm that connects it to the conceptually simpler and advantageous sum of sub-Hamiltonians approach. Starting from this framework, we further explore a hierarchy of parallelism strategies, that includes (i) parallelism over the sum of sub-Hamiltonians, (ii) parallelism over sites, (iii) parallelism over normal and complementary operators, (iv) parallelism over symmetry sectors, and (v) parallelism over dense matrix multiplications. We describe how to reduce processor load imbalance and the communication cost of the algorithm to achieve higher efficiencies. We illustrate the performance of our new open-source implementation on a recent benchmark ground-state calculation of benzene in an orbital space of 108 orbitals and 30 electrons, with a bond dimension of up to 6000, and a model of the FeMo cofactor with 76 orbitals and 113 electrons. The observed parallel scaling from 448 to 2800 CPU cores is nearly ideal.
description: 14 pages, 6 figures; typos corrected
O'ZBEK-INGLIZ  TILI FRAZEMALARINING  PARALLEL KORPUSI MATNLARINI EKSTRALINGVISTIK TEGLASH
Creators: name: Nurullayeva, Oydin
Publisher: name: Zenodo
Year: 2024

description: Mazkur maqolada ekstralingvistik teg yoki metaaxborot (ruscha: metadannыe) – tashqi-intellektual maʼlumotlarni qamrab oluvchi, bibliografik, tipologik, tematik, sotsiologik tavsifni; formal-struktur teg (matn, bo‘lim, bob, qism, xatboshi, gap)ni, shuningdek, texnik-texnologik teg (kodirovka, manbaning elektron versiyasini qayta ishlash sanasi)ni birlashtiruvchi teg turi haqida, uning ahamiyati haqida so‘z boradi. Shuningdek, metaaxborot majmuining  foydalanuvchiga beradigan imkoniyatlari keltirib o‘tiladi.
Suppressors of position-effect variegation and the cdc2Dm gene in Drosophila Melanogaster
Creators: name: Clegg, Nigel
Publisher: name: University of British Columbia
Year: 2008

description: Suppressor of Position-Effect-Variegation {Su(var)} mutations in Drosophila melanogaster are believed to identify genes that participate i n the establishment or maintenance of heterochromatic domains. A cytogenetic analysis of region 31 of the Drosophila melanogaster polytene chromosome map was undertaken to clarify the number and position of several previously identified Su(var) mutations. Ten deficiencies were used to divide the 31 region into 15 separate subintervals. Results of this analysis suggest that there is a single Su(var) locus (Suvar(2)1) in the 31A-B region. Two recessive suppressors of position-effect variegation reside in the 31E- 32A region. A fourth locus, Su(var)216, was positioned in region 3IE. Additional mutations were sought throughout the 31 region. In total , one hundred and twenty-one new EMS, gamma-irradiation , and P element induced mutations were tested for complementation and mapped using deficiencies. None of the mutations had a Su(var) phenotype, but 8 alleles failed to complement the lethal phenotype associated with the Su(var)216 chromosome. A P element induced allele of Su(var)216 was cloned and sequenced. The P is adjacent to cdc2Dm, the Drosophila homologue of the fission yeast cdc2 gene. The kinase encoded by cdc2 is required for proper progression through the cell cycle. The lethal phenotype of Su(var)216 can be rescued by an ectopically placed cdc2Dm gene construct; however, the Su(var) phenotypes are not rescued. Deficiency mapping of Su(var)216 with a cdc2Dm gene construct in the genetic background suggests that the Su(var)216 and cdc2Dm mutations may be tightly linked (<0.5 cM) but separable. [more abstract]
Towards quantum frequency combs: boosting the generation of highly nonclassical light states by cavity-enhanced parametric down-conversion at high repetition rates
Creators: name: Zavatta, Alessandro
name: Parigi, Valentina
name: Bellini, Marco
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate the generation of multi-photon quantum states of light by cavity-enhanced parametric down-conversion in the high-repetition-rate pulsed regime. An external enhancement cavity resonant with the spectral comb of modes of a mode-locked pump laser provides a coherent build-up of the pump intensity and greatly enhances the parametric gain without sacrificing its high repetition rate and comb structure. We probe the parametric gain enhancement by the conditional generation and tomographic analysis of two-photon Fock states. Besides its potential impact to efficiently generate highly-nonclassical or entangled multi-photon states in many existing experimental setups, this scheme opens new and exciting perspectives towards the combination of quantum and comb technologies for enhanced measurements and advanced quantum computation protocols.
description: 5 pages 3 figures; updated with major additions, added references, and changed title. Accepted for publication in Physical Review A
Rethinking Indigenous pathways to health in Eastern Taiwan: negotiating the complex terrains of local sociality, cultural sovereignty, and biomedical governmentality
Creators: name: Chang, Ying-tzu Ena
Publisher: name: Macquarie University
Year: 2024
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: This thesis explores pathways to Indigenous health as complex negotiations between local sociality, cultural sovereignty, and biomedical governmentality. It examines how Indigenous-centered health initiatives in two Eastern Taiwan communities are challenging the hegemony of the biomedical models favored by the Taiwanese state. These two Taiwan-based ethnographies are paired with textual research and interviews with policy makers and health professionals in both Taiwan and New Zealand. The thesis considers how the Taiwanese state governs Indigenous health through a dominant biomedical approach and problematizes 1) the state’s imaginary of a singular framing of the Indigenous population and, 2) the multiple ways in which the state (mis)understands Indigenous cultures. Identifying significant disjunctures between state policy and community realities, it suggests that conceptualizing health as assemblage with emphasis on heterogeneity, connectivity, and indeterminacy as a way to move beyond the linear, individualistic, and risk avoidance notions of health presupposed by biomedical and social-determinant models. Based on the ethnographic evidence, it also suggests conceptualizing Indigeneity as articulating across spatial, temporal, and ethnic categories as a way to address the intricacy of contemporary Indigenous cultures. Using an innovative field-informed literature review, the thesis also draws insights from Whānau Ora, a Māori health initiative in Aotearoa / New Zealand. Whānau Ora highlights the values of self-determination, strength-based thinking, and relationality. The thesis argues that approaches to Indigenous health that are biomedicalized through a deficit-based mode founded on a statistical comparison between Indigenous and general populations with the former needing ‘improvement’, require careful reconsideration. It offers a reframing of pathways to wellbeing through claiming cultural sovereignty – which, as an alternative to the externally defined political sovereignty, is founded from within Indigenous knowledges and future-oriented - to validate contemporary hybrid cultures of everyday Indigenous experiences as legitimately Indigenous and to value sociality in the context of current Indigenous cultural identity.
Finsler geometry modeling and Monte Carlo study of skyrmion shape deformation by uniaxial stress
Creators: name: Hog, Sahbi El
name: Kato, Fumitake
name: Koibuchi, Hiroshi
name: Diep, Hung T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Skyrmions in chiral magnetic materials are topologically stable and energetically balanced spin configurations appearing under the presence of ferromagnetic interaction (FMI) and Dzyaloshinskii-Moriya interaction (DMI). Much of the current interest has focused on the effects of magneto-elastic coupling on these interactions under mechanical stimuli, such as uniaxial stresses for future applications in spintronics devices. Recent studies suggest that skyrmion shape deformations in thin films are attributed to an anisotropy in the coefficient of DMI, such that $D_{x}\!\not=\!D_{y}$, which makes the ratio $λ/D$ anistropic, where the coefficient of FMI $λ$ is isotropic. It is also possible that $λ_{x}\!\not=\!λ_{y}$ while $D$ is isotropic for $λ/D$ to be anisotropic. In this paper, we study this problem using a new modeling technique constructed based on Finsler geometry (FG). Two possible FG models are examined: In the first (second) model, the FG modeling prescription is applied to the FMI (DMI) Hamiltonian. We find that these two different FG models' results are consistent with the reported experimental data for skyrmion deformation. We also study responses of helical spin orders under lattice deformations corresponding to uniaxial extension/compression and find a clear difference between these two models in the stripe phase, elucidating which interaction of FMI and DMI is deformed to be anisotropic by uniaxial stresses.
description: 42 pages, 23 figures
Structural stochastic responses determination via a sample-based stochastic finite element method
Creators: name: Zheng, Zhibao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper presents a new stochastic finite element method for computing structural stochastic responses. The method provides a new expansion of stochastic response and decouples the stochastic response into a combination of a series of deterministic responses with random variable coefficients. A dedicated iterative algorithm is proposed to determine the deterministic responses and corresponding random variable coefficients one by one. The algorithm computes the deterministic responses and corresponding random variable coefficients in their individual space and is insensitive to stochastic dimensions, thus it can be applied to high dimensional stochastic problems readily without extra difficulties. More importantly, the deterministic responses can be computed efficiently by use of existing Finite Element Method (FEM) solvers, thus the proposed method can be easy to embed into existing FEM structural analysis softwares. Three practical examples, including low-dimensional and high-dimensional stochastic problems, are given to demonstrate the accuracy and effectiveness of the proposed method.
Observations of OI and CaII Emission Lines in Quasars: Implications for the Site of FeII Line Emission
Creators: name: Matsuoka, Y.
name: Oyabu, S.
name: Tsuzuki, Y.
name: Kawara, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results of the near-infrared (IR) spectroscopy of six quasars whose redshifts range from 0.158 to 1.084. Combined with the satellite ultraviolet data, the relative line strengths of OI 1304, OI 8446, OI 11287, and the near-IR CaII triplet are given. In addition, the corresponding OI line strengths measured in normal Seyfert 1s and narrow-line Seyfert 1s are collected from the literature. These lines are thought to emerge from the same gas as do the FeII lines, so they are good tracers of the FeII emission region within a broad emission line region (BELR) in active galactic nuclei (AGNs). In order to reveal the physical condition within the relevant emission region, we performed photoionized model calculations and compared them to the observations. It suggests that a rather dense gas with density nH ~ 10^(11.5) cm-3 is present at an outer portion of the BELR, illuminated by the ionizing radiation corresponding to an ionization parameter U ~ 10^(-2.5) and is primarily responsible for the observed OI, CaII, and FeII lines, based on the resemblance of their profiles. The three OI lines are proven to be formed through Ly beta fluorescence and collisional excitation. We also show that the lambda1304 bump typically observed in AGN spectra consists of the comparable contributions of OI and SiII multiplets, and we discuss the origin of such a strong SiII emission. The results are interpreted in the context of the locally optimally emitting cloud (LOC) scenario to find the plausible gas distribution within the BELR as a function of distance from the central source and density.
description: Accepted for publication in ApJ; some rewordings made
The Fast Exact Closure for Jeffery's Equation with Diffusion
Creators: name: Montgomery-Smith, Stephen
name: Jack, David
name: Smith, Douglas E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Jeffery's equation with diffusion is widely used to predict the motion of concentrated fiber suspensions in flows with low Reynold's numbers. Unfortunately, the evaluation of the fiber orientation distribution can require excessive computation, which is often avoided by solving the related second order moment tensor equation. This approach requires a `closure' that approximates the distribution function's fourth order moment tensor from its second order moment tensor. This paper presents the Fast Exact Closure (FEC) which uses conversion tensors to obtain a pair of related ordinary differential equations; avoiding approximations of the higher order moment tensors altogether. The FEC is exact in that when there are no fiber interactions, it exactly solves Jeffery's equation. Numerical examples for dense fiber suspensions are provided with both a Folgar-Tucker (1984) diffusion term and the recent anisotropic rotary diffusion term proposed by Phelps and Tucker (2009). Computations demonstrate that the FEC exhibits improved accuracy with computational speeds equivalent to or better than existing closure approximations.
Grammatical elicitation: Transitive verbs, subject relative clauses, reflexives
Creators: name: Sales, Henry
name: Scott, Tessa
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: mam

description: Transitive sentences using qes 'cut' and other transitive verbs are elicited in neutral contexts. Relative clauses in the imperfective and potential aspects. For notes, see PDF pages 48-51 of related field notes.
Quantum tunneling of magnetization in dipolar spin-1 condensates under external fields
Creators: name: Yang, Limin
name: Zhang, Yunbo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the macroscopic quantum tunneling of magnetization of the F=1 spinor condensate interacting through dipole-dipole interaction with an external magnetic field applied along the longitudinal or transverse direction. We show that the ground state energy and the effective magnetic moment of the system exhibit an interesting macroscopic quantum oscillation phenomenon originating from the oscillating dependence of thermodynamic properties of the system on the vacuum angle. Tunneling between two degenerate minima are analyzed by means of an effective potential method and the periodic instanton method.
description: 2 figures, accepted PRA
Dislocation and Indium Droplet Related Emission Inhomogeneities in InGaN LEDs
Creators: name: van Deurzen, Len
name: Ruiz, Mikel Gómez
name: Lee, Kevin
name: Turski, Henryk
name: Bharadwaj, Shyam
name: Page, Ryan
name: Protasenko, Vladimir
name: Huili
name: Xing
name: Lähnemann, Jonas
name: Jena, Debdeep
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: This report classifies emission inhomogeneities that manifest in InGaN quantum well blue light-emitting diodes grown by plasma-assisted molecular beam epitaxy on free-standing GaN substrates. By a combination of spatially resolved electroluminescence and cathodoluminescence measurements, atomic force microscopy, scanning electron microscopy and hot wet KOH etching, the identified inhomogeneities are found to fall in four categories. Labeled here as type I through IV, they are distinguishable by their size, density, energy, intensity, radiative and electronic characteristics and chemical etch pits which correlates them with dislocations. Type I exhibits a blueshift of about 120 meV for the InGaN quantum well emission attributed to a perturbation of the active region, which is related to indium droplets that form on the surface in the metal-rich InGaN growth condition. Specifically, we attribute the blueshift to a decreased growth rate of and indium incorporation in the InGaN quantum wells underneath the droplet which is postulated to be the result of reduced incorporated N species due to increased N$_{2}$ formation. The location of droplets are correlated with mixed type dislocations for type I defects. Types II through IV are due to screw dislocations, edge dislocations, and dislocation bunching, respectively, and form dark spots due to leakage current and nonradiative recombination.
description: 11 pages, 8 figures
Spectroscopy of a canonically quantized horizon
Creators: name: Ansari, Mohammad H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Deviations from Hawking's thermal black hole spectrum, observable for macroscopic black holes, are derived from a model of a quantum horizon in loop quantum gravity. These arise from additional area eigenstates present in quantum surfaces excluded by the classical isolated horizon boundary conditions. The complete spectrum of area unexpectedly exhibits evenly spaced symmetry. This leads to an enhancement of some spectral lines on top of the thermal spectrum. This can imprint characteristic features into the spectra of black hole systems. It most notably gives the signature of quantum gravity observability in radiation from primordial black holes, and makes it possible to test loop quantum gravity with black holes well above Planck scale.
description: 49 pages, 8 figures. Published in section: Field Theory And Statistical Systems
Stability of Charged Thin-Shell Gravastars with Quintessence
Creators: name: Sharif, M.
name: Javed, Faisal
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper develops a new solution of gravitational vacuum star in the background of charged Kiselev black holes as an exterior manifold. We explore physical features and stability of thin-shell gravastars with radial perturbation. The matter thin layer located at thin-shell greatly affects stable configuration of the developed structure. We assume three different choices of matter distribution such as barotropic, generalized Chaplygin gas and generalized phantomlike equation of state. The last two models depend on the shell radius, also known as variable equation of state. For barotropic model, the structure of thin-shell gravastar is mostly unstable while it shows stable configuration for such type of matter distribution with extraordinary quintessence parameter. The resulting gravastar structure indicates stable behavior for generalized Chaplygin gas but unstable for generalized phantomlike model. It is also found that proper length, entropy and energy within the shell show linear relation with thickness of the shell.
description: 23 pages, 9 figures
Representing masculinities in Japanese film and television
Creators: name: Barber, Christie Lee
Publisher: name: Macquarie University
Year: 2024
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: This thesis by publication examines film and television representations of masculinity that present some form of challenge to established gender roles and relations. The works selected for analysis reject the notion of a single, natural or inevitable model of masculinity through the depiction of diverse forms of masculinity, and often privilege versions of non-normative masculinity. However the process of forging masculine subjectivity is often portrayed as filled with tension and contradiction, which in some cases limits the challenge the representations can make to conventional gender configurations. Moreover, even the alternative versions of masculinity offered by the works may still uphold relations of inequality and opposition, or constitute new, unachievable models of masculinity.
Japanese film and television representations of boys and young men have been little analysed. This study seeks to expand and refine academic understandings of the ways in which fiction contributes to the construction of viewers’ gendered subjectivities by offering viewers models of behaviour and privileging some forms of masculinity over others. Such analysis can thus help to illuminate how ideologies of gender are preserved or challenged in fiction.
Further, through the examination of film and television representations of masculinity with relation to specific socio-historical circumstances, this research also builds upon current knowledge on the changing nature of masculinities in Japan. Informed by Raewyn (R.W.) Connell’s definition of masculinity as a socially constructed process of configuring gender practice (2000, 28-29), my analysis focuses on representations of male protagonists as gendered not only through social structures but also individual practice. My research also analyses representations of the relationships between masculine subjectivities and their social worlds, and the concept of hegemonic masculinity is employed – with specific reference to the Japanese context – to explore how fictional representations articulate the configuration of gender within structures of social relations (Connell 2000, 23-29; 2005, 71-75). The integration of Japanese conceptions of subjectivity into my analysis ensures a dialogic methodological approach that explores how gendered subjectivities are constructed and expressed through relationships with others and the social context.
A composite model for DNA torsion dynamics
Creators: name: Cadoni, M.
name: De Leo, R.
name: Gaeta, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biomolecules (q-bio.BM)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: DNA torsion dynamics is essential in the transcription process; a simple model for it, in reasonable agreement with experimental observations, has been proposed by Yakushevich (Y) and developed by several authors; in this, the DNA subunits made of a nucleoside and the attached nitrogen bases are described by a single degree of freedom. In this paper we propose and investigate, both analytically and numerically, a ``composite'' version of the Y model, in which the nucleoside and the base are described by separate degrees of freedom. The model proposed here contains as a particular case the Y model and shares with it many features and results, but represents an improvement from both the conceptual and the phenomenological point of view. It provides a more realistic description of DNA and possibly a justification for the use of models which consider the DNA chain as uniform. It shows that the existence of solitons is a generic feature of the underlying nonlinear dynamics and is to a large extent independent of the detailed modelling of DNA. The model we consider supports solitonic solutions, qualitatively and quantitatively very similar to the Y solitons, in a fully realistic range of all the physical parameters characterizing the DNA.
description: 29 pages
Level of uncertainity preceived by women hospitalized with high-risk pregnancy
Creators: name: Clauson, Marion Isobelle
Publisher: name: University of British Columbia
Year: 2008

description: This descriptive correlational study was designed to determine the perceived level of uncertainty of women hospitalized with high-risk pregnancy. The study investigated the difference between levels of uncertainty at 48 hours after admission and at the time of discharge. The relationships between uncertainty and factors that might influence this uncertainty such as parity, length of stay, maternal age and gestational age were also investigated. The Mishel (1988) theory of uncertainty in illness and Snyder's (1979) framework of an altered trajectory of high-risk pregnancy guided this study. A convenience study of 58 women who were admitted to the antepartum units of atertiary obstetrical hospital completed the Uncertainty Stress Scale-High-Risk Pregnancy Version (USS-HRPV) and a patient information sheet. The subjects were approached by the researcher and voluntarily completed a questionnaire shortly after admission and again upon discharge. Overall, the high-risk women perceived moderately low levels of uncertainty at 48hours after admission and these levels dropped significantly by the time of discharge. The nature of the uncertainty experienced upon admission was related to not knowing the cause of the high-risk condition or symptoms, and to concerns about the stability of the condition and about the baby's chances to be healthy. At the time of discharge, the uncertainty was generated by the unpredictability of symptoms, by not knowing how long the symptoms will last and by concern about the baby. No significant difference was found between uncertainty levels of primigravidas and multigravidas either at admission or at discharge. Although a tendency was found for 111 uncertainty to decrease as maternal age increased, there was no significant relationship. A significant negative relationship was demonstrated between uncertainty and gestational age. A significant positive relationship was found between uncertainty and length of stay, as well as overall perception of stress. The findings of this study were discussed in relation to other research studies, the theoretical framework, and methodological problems inherent to the study. Implications for nursing practice, theory and education and recommendations for future research were identified.
Ανάπτυξη εφαρμογής για βελτιστοποίηση των πωλήσεων σε επιχειρήσεις λιανικής σύμφωνα τις προτιμήσεις των καταναλωτών
Creators: name: Καλαούζης, Σταύρος Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Εξόρυξη Γνώσης
Συστήματα Επιχειρηματικής Ευφυΐας
Μηχανική Μάθηση
Data Mining
Business Intelligence Systems
Machine Learning

description: Ο ανταγωνισμός ανάμεσα στις επιχειρήσεις και οι οικονομικές συνθήκες σήμερα έχουν δημιουργήσει την ανάγκη για συστήματα που θα δίνουν προβλέψεις για την συμπεριφορά των καταναλωτών, ώστε να παρέχουν στις επιχειρήσεις λιανικής προβλέψεις μέσα από τα δεδομένα των καταναλωτών. Η έλλειψη αντιπροσωπευτικού δείγματος δεδομένων και η πολυπλοκότητα δημιουργίας μαθηματικού μοντέλου πρόβλεψης τέτοιων πληροφοριών έρχεται να καλύψει η επιστήμη της πληροφορικής και το πεδίο της μηχανικής μάθησης. Η τεχνική ανάλυσης του καλαθιού του καταναλωτή κάνοντας χρήση κανόνων συσχέτισης είναι μια μέθοδος κατά την οποία δίνετε η δυνατότητα να προβλεφθεί η πιθανότητα να αγορασθεί ένα προϊόν μαζί με ένα άλλο προϊόν ή ένα σύνολο προϊόντων από έναν καταναλωτή. Στόχος της παρούσας διπλωματικής εργασίας είναι να αναπτυχθεί μια εφαρμογή που θα δίνει αυτού του είδους τις προβλέψεις σε επιχειρήσεις λιανικής με την παραπάνω τεχνική μέσα από τα δεδομένα του πληροφοριακού συστήματος που χρησιμοποιούν αυτές οι επιχειρήσεις. Για αυτόν τον σκοπό γίνεται χρήση της πλατφόρμας RapidMiner για την δημιουργία της εφαρμογής και της υπηρεσίας ιστού (web-service) που ενσωματώνει την εφαρμογή που θα καλεί το Business Evolution ERP
description: The fierce competition between businesses as well as the present financial conditions has emerged the need for systems that provide prediction analytics of the consumer’s behavior, in order to provide retail business with insights based on the consumers' data. The lack of a representative data sample along with the complexity of designing mathematical models for the prediction of such information is compensated by computer science and the field of machine learning. The approach of the market basket analysis utilizing association rules is a method that allows the probability of the probability of purchasing a product along with a second product or with a set of products for a consumer. The aim of this thesis is to develop an application that will provide this kind of predictions to retail business employing the above approach utilizing the data of the information system of these companies. For this purpose, the RapidMiner platform is used for the development of the process and the web-service that would integrate the Business Evolution ERP as add-on application
METHODS OF TEACHING LANGUAGE THROUGH READING IN THE ORIGINAL (ILYA FRANK)
Creators: name: Abdullaev, Maksud
Publisher: name: Zenodo
Year: 2024

description: Reading is an important part of learning any foreign language. As the student is acquainted with books, he expands his vocabulary and studies the main structures of the language. This paper examines the methodology of teaching language through reading in the original, developed by philologist Ilya Frank. Frank's method is based on the study of authentic texts in the target language. Gradually increasing the complexity of texts allows students to master vocabulary, grammar and develop reading skills. Analyzing and discussing what you read helps improve your oral and written communication skills. The Frank Method is an effective tool for language learning. When used correctly, it can improve the quality of learning and make it more interesting for students. This article also explains the advantages of method and its disadvantages. The result of the study is presented in the form of a diagram.
Exact Friedmann Solutions in Higher-Order Gravity Theories
Creators: name: Clifton, Timothy
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We find the general behaviour of homogeneous and isotropic cosmological models in some fourth-order theories of gravity. Explicit, exact, general solutions are given for both empty universes and those filled with a perfect fluid. For the vacuum case, solutions are found with closed, open and flat geometries, whilst the perfect fluid solutions are all spatially flat. Both early and late-time limits are studied, and attractor behaviour towards simple power-law expansion is identified. Multiple solutions to the same theories, with the same matter content and topology are found. It is shown that these solutions exhibit great variety in their evolution.
description: 24 pages, 6 figures
Performance and Complexity Analysis of bi-directional Recurrent Neural Network Models vs. Volterra Nonlinear Equalizers in Digital Coherent Systems
Creators: name: Deligiannidis, Stavros
name: Mesaritakis, Charis
name: Bogris, Adonis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We investigate the complexity and performance of recurrent neural network (RNN) models as post-processing units for the compensation of fibre nonlinearities in digital coherent systems carrying polarization multiplexed 16-QAM and 32-QAM signals. We evaluate three bi-directional RNN models, namely the bi-LSTM, bi-GRU and bi-Vanilla-RNN and show that all of them are promising nonlinearity compensators especially in dispersion unmanaged systems. Our simulations show that during inference the three models provide similar compensation performance, therefore in real-life systems the simplest scheme based on Vanilla-RNN units should be preferred. We compare bi-Vanilla-RNN with Volterra nonlinear equalizers and exhibit its superiority both in terms of performance and complexity, thus highlighting that RNN processing is a very promising pathway for the upgrade of long-haul optical communication systems utilizing coherent detection.
description: 8 pages, 8 figures
Επαυξημένη πραγματικότητα στο Νηπιαγωγείο: Μία διερεύνηση κινήτρων μάθησης
Creators: name: Λιάπτση, Βασιλική Ευαγγέλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Επαυξημένη πραγματικότητα
Κίνητρα
Νηπιαγωγείο
Augmented reality
ARCS
Preschool

description: Τα τελευταία χρόνια το ερευνητικό ενδιαφέρον αναφορικά με τη χρήση και επίδραση της επαυξημένης πραγματικότητας στην εκπαίδευση έχει αυξηθεί σημαντικά. Η πλειοψηφία των ερευνών, που έχουν διεξαχθεί μέχρι σήμερα για την αξιοποίηση της επαυξημένης πραγματικότητας στην εκπαίδευση, έχει εστιάσει σε γνωστικά αποτελέσματα. Η παρούσα εργασία, αναγνωρίζοντας τη σημαντικότητα της συναισθηματικής πλευράς της μάθησης, διερευνά την παιδαγωγική αξία εφαρμογών επαυξημένης πραγματικότητας στα μαθησιακά κίνητρα παιδιών Νηπιαγωγείου, όπως παρουσιάζονται στην ταξινομία που προτείνει ο Keller (1987c). Δείγμα της έρευνας αποτέλεσαν 32 μαθητές και μαθήτριες 5-6 ετών, χωρισμένοι σε δύο τάξεις. Τα δύο τμήματα συμμετείχαν σε διδασκαλίες ίδια σχεδιασμένες, με τη μόνη διαφορά να έγκειται στο ότι το ένα τμήμα διδάχθηκε με την αξιοποίηση της επαυξημένης πραγματικότητας. Η συλλογή των δεδομένων πραγματοποιήθηκε μέσω παρατήρησης και με τη χρήση ενός αυτό-αναφορικού ερωτηματολογίου, βασισμένου στο ερευνητικό εργαλείο Instructional Materials Motivation Survey (Keller, 1987b). Τα αποτελέσματα έδειξαν ό,τι η αξιοποίηση της επαυξημένης πραγματικότητας στη διδασκαλία επηρέασε θετικά τα κίνητρα μάθησης των παιδιών.
description: In the last few decades the researchers’ interest on the use and the results of augmented reality in education is increased. Most of the research is focused on the cognitive effects of augmented reality. This paper, recognizing the importance of the effective aspect of learning, researches the pedagogical value that augmented reality has on preschool children’s motives. We follow the motivational taxonomy that Keller (1987c) introduces. The sample is consisted of 32 students aged 5-6, split in to two groups. Each group takes marks the experimental and control group respectively and is taught the same way with the only exception being that the experimental will use an augmented reality book. Data will be collected through observation and a questionnaire based on the Instructional Materials Motivation Survey (Keller, 1987b). Results showed that using augmented reality in the educational process has positive outcomes on children’s motivation.
description: Σε συνεργασία με: Παιδαγωγικό Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Ιωαννίνων)
All-Optical Experimental Control of High-Harmonic Photon Energy
Creators: name: Oldal, Lénárd Gulyás
name: Ye, Peng
name: Filus, Zoltán
name: Csizmadia, Tamás
name: Grósz, Tímea
name: de Marco, Massimo
name: Bengery, Zsolt
name: Seres, Imre
name: Gilicze, Barnabás
name: Jójárt, Péter
name: Varjú, Katalin
name: Kahaly, Subhendu
name: Major, Balázs
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We generate high-order harmonics in gaseous medium with tunable photon energy using time domain interferometry of double pulses in a non-collinear generation geometry. The method is based on the fact that the generated harmonics inherit certain spectral properties of the driving laser. The two temporally delayed ultrashort laser pulses, identical in all parameters, are produced by a custom-made split-and-delay unit utilizing wave front splitting without a significant energy loss. The arrangement is easy to implement in any attosecond pulse generation beamline, and is suitable for the production of an extreme ultraviolet source with simply and quickly variable central photon energy, useful for a broad range of applications.
description: 6 pages, 5 figures, after peer-review
Supplementary document for Rapid slide-free and non-destructive histological imaging using wide-field optical-sectioning microscopy - 5779849.pdf
Creators: name: Zhang, Yan
name: Kang, Lei
name: Lo, Claudia
name: Tsang, Victor
name: Wong, Terence T. W.
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: Cancer Diagnosis
Biomedical Instrumentation

description: Supplementary figures that contains Fig. S1 to Fig. S5