cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Periodic patterns for resolution limit characterization of correlation plenoptic imaging
Creators: name: Scattarella, Francesco
name: Massaro, Gianlorenzo
name: Stoklasa, Bohumil
name: D'Angelo, Milena
name: Pepe, Francesco V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The measurement of the spatio-temporal correlations of light provides an interesting tool to overcome the traditional limitations of standard imaging, such as the strong trade-off between spatial resolution and depth of field. In particular, using correlation plenoptic imaging, one can detect both the spatial distribution and the direction of light in a scene, pushing both resolution and depth of field to the fundamental limit imposed by wave-optics. This allows one to perform refocusing of different axial planes and three-dimensional reconstruction without any spatial scanning. In the present work, we investigate the resolution limit in a particular correlation plenoptic imaging scheme, by considering periodic test patterns, which provide, through analytical results, a deeper insight in the resolution properties of this second-order imaging technique, also in comparison with standard imaging.
description: 16 pages, 4 figures
Gravitational Lensing - Einstein's Unfinished Symphony
Creators: name: Treu, Tommaso
name: Ellis, Richard S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gravitational lensing - the deflection of light rays by gravitating matter - has become a major tool in the armoury of the modern cosmologist. Proposed nearly a hundred years ago as a key feature of Einstein's theory of General Relativity, we trace the historical development since its verification at a solar eclipse in 1919. Einstein was apparently cautious about its practical utility and the subject lay dormant observationally for nearly 60 years. Nonetheless there has been rapid progress over the past twenty years. The technique allows astronomers to chart the distribution of dark matter on large and small scales thereby testing predictions of the standard cosmological model which assumes dark matter comprises a massive weakly-interacting particle. By measuring distances and tracing the growth of dark matter structure over cosmic time, gravitational lensing also holds great promise in determining whether the dark energy, postulated to explain the accelerated cosmic expansion, is a vacuum energy density or a failure of General Relativity on large scales. We illustrate the wide range of applications which harness the power of gravitational lensing, from searches for the earliest galaxies magnified by massive clusters to those for extrasolar planets which temporarily brighten a background star. We summarise the future prospects with dedicated ground and space-based facilities designed to exploit this remarkable physical phenomenon.
description: Contemporary Physics: Invited review to celebrate the United Nations "International Year of Light". 21 pages, 11 figures. Refereed and Accepted. To appear spring 2015
Lagrangian space consistency relation for large scale structure
Creators: name: Horn, Bart
name: Hui, Lam
name: Xiao, Xiao
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Consistency relations, which relate the squeezed limit of an (N+1)-point correlation function to an N-point function, are non-perturbative symmetry statements that hold even if the associated high momentum modes are deep in the nonlinear regime and astrophysically complex. Recently, Kehagias & Riotto and Peloso & Pietroni discovered a consistency relation applicable to large scale structure. We show that this can be recast into a simple physical statement in Lagrangian space: that the squeezed correlation function (suitably normalized) vanishes. This holds regardless of whether the correlation observables are at the same time or not, and regardless of whether multiple-streaming is present. The simplicity of this statement suggests that an analytic understanding of large scale structure in the nonlinear regime may be particularly promising in Lagrangian space.
description: 19 pages, no figures
Additional file 1 of Exploration of the pearl millet phospholipase gene family to identify potential candidates for grain quality traits
Creators: name: Moin, Mazahar
name: Bommineni, Pradeep Reddy
name: Tyagi, Wricha
Publisher: name: figshare
Year: 2024
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Supplementary Material 1
Lifetime measurement of candidate chiral doublet bands in the Rh103,104 isotopes with the recoil-distance Doppler-shift method in inverse kinematics
Creators: name: Timár, J.
name: Suzuki, T.
name: Zhu, S.
name: Ahn, T.
name: Rainovski, G.
name: Joshi, P.
name: Lister, C.J.
name: Costin, A.
name: Koike, T.
name: Dewald, A.
name: Möller, O.
name: Wadsworth, R.
name: Shinozuka, T.
name: Janssens, R.V.F.
name: Vaman, C.
name: Carpenter, M.P.
name: Danchev, M.
name: Pietralla, N.
Publisher: name: American Physical Society
Year: 2008

description: Lifetimes of chiral candidate structures in Rh103,104 were measured using the recoil distance Doppler-shift method. The Gammasphere detector array was used in conjunction with the Cologne plunger device. Excited states of Rh103,104 were populated by the 11B(96Zr,4n)103Rh and 11B(96Zr,3n)104Rh fusion-evaporation reactions in inverse kinematics. Three and five lifetimes of levels belonging to the proposed chiral doublet bands are measured in Rh103 and Rh104, respectively. The previously observed even-odd spin dependence of the B(M1)/B(E2) values is caused by the variation in the B(E2) values, whereas the B(M1) values decrease as a function of spin.
title: Εξασθενές χρώμιο στο πόσιμο νερό - Τρόποι διεργασιών απομάκρυνσής του
title: Hexavalent chromium in drinking water - Study of its removal procedures
titleType: AlternativeTitle
Creators: name: Αρβανίτη, Μαρία
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Εξασθενές χρώμιο
Πόσιμο νερό
Μέθοδοι απομάκρυνσης
Υγεία
Περιβάλλον
Ρύπανση
Δημόσια υγεία
Hexavalent chromium

description: Το εξασθενές χρώμιο και οι ενώσεις του μπορούν να βρεθούν φυσικά στο περιβάλλον ή να παραχθούν από τις ανθρωπογενείς δραστηριότητες. Μέσω αυτών έχει την ικανότητα να διαπεράσει στα υπόγεια ύδατα και να επηρεάσει την ποιότητα του νερού και να θέσει σε κίνδυνο τις ζωές των ανθρώπων. Επομένως έχει τεράστια επίπτωση στο περιβάλλον συμπεριλαμβανομένου του νερού, του εδάφους και των φυτών αλλά και στην υγεία του ανθρώπου. Οι επιπτώσεις αυτές μπορούν να ελαχιστοποιηθούν με τους κατάλληλους τρόπους απομάκρυνσης και ανάκτησης του χρωμίου όπου ολοένα και περισσότερο ανακαλύπτονται νέες βιώσιμες, οικολογικές και αποδοτικές τεχνολογίες. Οι τρόποι απομάκρυνσης του χρωμίου συμπεριλαμβάνουν τόσο φυσικοχημικές μεθόδους όσο και βιολογικές μεθόδους με τις τελευταίες να αναπτύσσονται ολοένα και περισσότερο λόγω της εξέλιξης της τεχνολογίας. Τα όρια ανίχνευσης ολικού χρωμίου και του εξασθενούς χρωμίου, καθώς και η ορθή διάθεση αποβλήτων από τις βιομηχανικές διεργασίες ορίζονται από την εκάστοτε νομοθεσία σε εθνικό, ευρωπαϊκό και παγκόσμιο επίπεδο. Η νομοθεσία μπορεί να αναθεωρηθεί αναλόγως και των περιστατικών ανίχνευσης του χρωμίου εκτός των ορίων που συνήθως εμφανίζεται σε ύδατα γειτονικών βιομηχανικών περιοχών. Η έκθεση στο χρώμιο είναι δυνατό να συμβεί από διάφορες πηγές και να προκύψουν δυσμενείς επιπτώσεις στην υγεία του ανθρώπου λόγω της τοξικότητας του. Καθώς το χρώμιο αποτελεί μέρος της παραγωγικής διαδικασίας σε πολλές βιομηχανίες κρίνεται απαραίτητη η λήψη μέτρων για τους εργαζομένους που εκτίθενται σε αυτό.
Motional narrowing and ergodic bands in excited superdeformed states of Hg194
Creators: name: Herskind, B.
name: Lee, I.-Y.
name: Carpenter, M.P.
name: Hackman, G.
name: Vigezzi, E.
name: Khoo, T.L.
name: Døssing, T.
name: MacChiavelli, A.O.
name: Matsuo, M.
name: Lopez-Martens, A.
name: Yoshida, K.
name: Janssens, R.V.F.
name: Lauritsen, T.
Publisher: name: American Physical Society
Year: 2008

description: The Eγ-Eγ coincidence spectra from the electromagnetic decay of excited superdeformed states in Hg194 reveal surprisingly narrow ridges, parallel to the diagonal. A total of 100-150 excited bands are found to contribute to these ridges, which account for nearly all the unresolved E2 decay strength. Comparison with theory suggests that these excited bands have many components in their wave functions, yet they display remarkable rotational coherence. This phenomenon can be explained in terms of the combination of shell effects and motional narrowing.
Meromorphic Bergman spaces
Creators: name: Ghiloufi, Noureddine
name: Zaway, Mohamed
Publisher: name: arXiv
Year: 2023
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30H20, 30A10

description: In this paper we introduce new spaces of holomorphic functions on the pointed unit disc of $\mathbb C$ that generalize classical Bergman spaces. We prove some fundamental properties of these spaces and their dual spaces. We finish the paper by extending Hardy-Littlewood and Fejér-Riesz inequalities to these spaces with an application on Toeplitz operators.
description: 15 pages, no figure
Microdosimetric Studies of Non-Ionising* Radiation Using Cylindrical Walled and Wall-less Proportional Counters
Creators: name: Saq'An, Subhi A H
Publisher: name: London South Bank University
Year: 1978

description: A wall-less proportional counter of unit elongation, based on Wilson (1970) design, has been constructed. The boundary of the sensitive volume has been delineated using a field plotting technique and a beam of collimated alpha particles from Am-241 source. The effect on the sensitive volume due to the potentials applied to the beam collimator and the container has been studied. The characteristics of the wall-less counter have then been studied and compared with those of the walled proportional counter of the same dimensions; these characteristics have also been compared with those expected from 4 theory of the conventional proportional counter. The transit time measurement of single electrons produced from the cathode by ultraviolet light has been carried out for the special counter design and gas mixture used in this project as a function of E/p. Indirectly ionising particles have been used for the microdosimetric studies - Am - 241, Cs - 137 and Ra - 226 as gamma radiation sources and Cf-252 as a source of mixed field of radiation (neutron + gamma). The energy deposition spectra have been studied for each source in both the walled and the wall-less counter. The average site diameter of about 0.5 um to 2 um tissue equivalent have been simulated. From the pulse height distribution of low LET radiation, the frequency probability density, yf(y), energy probability density, y-£(y) distributions and their averages yF and yD, respectively, have been calculated. The wall-effect, obtained from a comparison of YF for the walled and wall-less counters, has been estimated. This walleffect has been found to lie between about 84% to about 102% except in one case when it was about 108%. A method of extrapolation for the event frequency distribution, N(y) Vs.y, to 30 eV has been suggested and used. Some of the results have been compared with those obtained by using the method proposed by Booz (1976). In the case of Cf-252 source, the gamma-ray contribution has been separated from that of neutrons by making use of the method proposed by Maier et al (1975). Comparison of YF for the walled and wall-less counters is inconclusive because of the large effect of the gamma-ray contribution on yF, but a comparison of yf(y) Vs y spectra shows no significant difference between the walled and wall-less counters in the lineal energy range of about 10 keV/μ to about 180 keV/μ.
FaST-GShare: Enabling Efficient Spatio-Temporal GPU Sharing in Serverless Computing for Deep Learning Inference
Creators: name: Gu, Jianfeng
name: Zhu, Yichao
name: Wang, Puxuan
name: Chadha, Mohak
name: Gerndt, Michael
Publisher: name: arXiv
Year: 2023
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Serverless computing (FaaS) has been extensively utilized for deep learning (DL) inference due to the ease of deployment and pay-per-use benefits. However, existing FaaS platforms utilize GPUs in a coarse manner for DL inferences, without taking into account spatio-temporal resource multiplexing and isolation, which results in severe GPU under-utilization, high usage expenses, and SLO (Service Level Objectives) violation. There is an imperative need to enable an efficient and SLO-aware GPU-sharing mechanism in serverless computing to facilitate cost-effective DL inferences. In this paper, we propose \textbf{FaST-GShare}, an efficient \textit{\textbf{Fa}aS-oriented \textbf{S}patio-\textbf{T}emporal \textbf{G}PU \textbf{Sharing}} architecture for deep learning inferences. In the architecture, we introduce the FaST-Manager to limit and isolate spatio-temporal resources for GPU multiplexing. In order to realize function performance, the automatic and flexible FaST-Profiler is proposed to profile function throughput under various resource allocations. Based on the profiling data and the isolation mechanism, we introduce the FaST-Scheduler with heuristic auto-scaling and efficient resource allocation to guarantee function SLOs. Meanwhile, FaST-Scheduler schedules function with efficient GPU node selection to maximize GPU usage. Furthermore, model sharing is exploited to mitigate memory contention. Our prototype implementation on the OpenFaaS platform and experiments on MLPerf-based benchmark prove that FaST-GShare can ensure resource isolation and function SLOs. Compared to the time sharing mechanism, FaST-GShare can improve throughput by 3.15x, GPU utilization by 1.34x, and SM (Streaming Multiprocessor) occupancy by 3.13x on average.
description: The paper has been accepted by ACM ICPP 2023
title: Использование радиодатчиков для обеспечения охраны объектов культуры
title: выпускная квалификационная работа бакалавра
titleType: Subtitle
title: Use of radio sensors to ensure the protection of cultural objects
Creators: name: Коновалов, Дмитрий
Publisher: name: Санкт-Петербургский политехнический университет Петра Великого
Year: 2019
Subjects: радиоканальная передача данных
радиодатчик
служба музейной безопасности
radio signal
sensors

description: Работа посвящена исследованию устройств радиочастотной идентификации. Рассмотрены способы применения датчиков с различными чувствительными элементами для обеспечения охраны экспонатов с использованием принципа радиоканальной передачи данных. Цель работы – исследование применения радиочастотных устройств для охраны объектов культуры и адаптация элементов радиоканального комплекса «Стрелец» в Государственном Эрмитаже с учетом требований внутренних служб. В работе рассмотрено использование устройств радиочастотной идентификации для обеспечения охраны объектов культуры, в качестве которых подразумеваются радиодатчики и браслеты комплекса «Стрелец» с дисплеем и без него. Разработан внешний вид и адаптированы опции браслета с дисплеем соответственно требованиям внутренних служб музея. В исследовании предполагается, что данными устройствами будут оснащаться службы музейной безопасности и музейных смотрителей. Предложены способы охраны экспонатов Государственного Эрмитажа с использованием радиодатчиков.
description: In the course of this work, the security radio channel system "Strelets" was considered. The requirements for the installation of radio channel sensors were analyzed. Adapted the appearance of the bracelet and simplified its options.
title: Improving the Performance of Opportunistic Networks in Real-World Applications Using Machine Learning Techniques
Creators: name: Rashidibajgan, Samaneh
name: Hupperich, Thomas
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2023
Subjects: subject: 330 Economics

description: In Opportunistic Networks, portable devices such as smartphones, tablets, and wearables carried by individuals, can communicate and save-carry-forward their messages. The message transmission is often in the short range supported by communication protocols, such as Bluetooth, Bluetooth Low Energy, and Zigbee. These devices carried by individuals along with a city’s taxis and buses represent network nodes. The mobility, buffer size, message interval, number of nodes, and number of messages copied in such a network influence the network’s performance. Extending these factors can improve the delivery of the messages and, consequently, network performance; however, due to the limited network resources, it increases the cost and appends the network overhead. The network delivers the maximized performance when supported by the optimal factors. In this paper, we measured, predicted, and analyzed the impact of these factors on network performance using the Opportunistic Network Environment simulator and machine learning techniques. We calculated the optimal factors depending on the network features. We have used three datasets, each with features and characteristics reflecting different network structures. We collected the real-time GPS coordinates of 500 taxis in San Francisco, 320 taxis in Rome, and 196 public transportation buses in Münster, Germany, within 48 h. We also compared the network performance without selfish nodes and with 5%, 10%, 20%, and 50% selfish nodes. We suggested the optimized configuration under real-world conditions when resources are limited. In addition, we compared the performance of Epidemic, Prophet, and PPHB++ routing algorithms fed with the optimized factors. The results show how to consider the best settings for the network according to the needs and how self-sustaining nodes will affect network performance.
description: Finanziert durch den Open-Access-Publikationsfonds der Westfälischen Wilhelms-Universität Münster (WWU Münster).
Possible shears bands in At204 and Fr206, and identification of excited states in Fr205,207
Creators: name: Sarantites, D.G.
name: Chiara, C.J.
name: Janssens, R.V.F.
name: Seweryniak, D.
name: Zhu, S.
name: Hartley, D.J.
name: Pechenaya, O.L.
name: Reviol, W.
name: Seyfried, E.P.
name: Lopez-Martens, A.
name: Hauschild, K.
name: Carpenter, M.P.
Publisher: name: American Physical Society
Year: 2008

description: Neutron-deficient astatine and francium nuclei were produced in the reaction 30Si+181Ta→211Fr* at 152 MeV. The evaporation residues from this very fissile system were selected with the HERCULES-II detector system and residue-gated γ rays were measured with Gammasphere. Excited states were observed for the first time in Fr205,207, as well as sequences of low-energy transitions between high-spin states in At204 and Fr206. These latter structures have properties similar to those associated with magnetic rotation (shears bands) in lead nuclei. Comparisons with established shears bands are presented and prospects for the magnetic-rotation phenomenon near the predicted N=120 "magic" number are explored.
IMPACT OF MIGRATION ON THE SUGARCANE CUTTER LABOURERS IN MAHARASHTRA
Creators: name: Supriya Chandrakant Gaikwad
Publisher: name: Zenodo
Year: 2022
Subjects: Migration, indebtedness, sowing, hysterectomy, uterus, Menstruation.

description: Abstract:  Maharashtra is the second largest sugar producing state of India after Utter Pradesh and is known for its high efficiency. The sector relies on informal workers, migrating from drought-prone Marathwada region, working as cane-cutters. Living and working conditions of these workers are exploitative, which keep them in a circle of poverty and indebtedness. Women and children face the hardest brunt of these exploitative conditions with basic rights and dignity denied. This paper is an attempt to highlight the impact of migration on the sugarcane cutter labourers in Maharashtra.
Percolation by cumulative merging and phase transition for the contact process on random graphs
Creators: name: Ménard, Laurent
name: Singh, Arvind
Publisher: name: arXiv
Year: 2015
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 82C22, 60K35, 05C80

description: Given a weighted graph, we introduce a partition of its vertex set such that the distance between any two clusters is bounded from below by a power of the minimum weight of both clusters. This partition is obtained by recursively merging smaller clusters and cumulating their weights. For several classical random weighted graphs, we show that there exists a phase transition regarding the existence of an infinite cluster. The motivation for introducing this partition arises from a connection with the contact process as it roughly describes the geometry of the sets where the process survives for a long time. We give a sufficient condition on a graph to ensure that the contact process has a non trivial phase transition in terms of the existence of an infinite cluster. As an application, we prove that the contact process admits a sub-critical phase on d-dimensional random geometric graphs and on random Delaunay triangulations. To the best of our knowledge, these are the first examples of graphs with unbounded degrees where the critical parameter is shown to be strictly positive.
description: 50 pages, many figures
Time Series Analysis of Urban Liveability
Creators: name: Levering, Alex
name: Marcos, Diego
name: Tuia, Devis
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In this paper we explore deep learning models to monitor longitudinal liveability changes in Dutch cities at the neighbourhood level. Our liveability reference data is defined by a country-wise yearly survey based on a set of indicators combined into a liveability score, the Leefbaarometer. We pair this reference data with yearly-available high-resolution aerial images, which creates yearly timesteps at which liveability can be monitored. We deploy a convolutional neural network trained on an aerial image from 2016 and the Leefbaarometer score to predict liveability at new timesteps 2012 and 2020. The results in a city used for training (Amsterdam) and one never seen during training (Eindhoven) show some trends which are difficult to interpret, especially in light of the differences in image acquisitions at the different time steps. This demonstrates the complexity of liveability monitoring across time periods and the necessity for more sophisticated methods compensating for changes unrelated to liveability dynamics.
description: Accepted at JURSE 2023
Photoionising feedback and the star formation rates in galaxies
Creators: name: MacLachlan, J. M.
name: Bonnell, I. A.
name: Wood, K.
name: Dale, J. E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Aims. We investigate the effects of ionising photons on accretion and stellar mass growth in a young star forming region, using a Monte Carlo radiation transfer code coupled to a smoothed particle hydrodynamics (SPH) simulation. Methods. We introduce the framework with which we correct stellar cluster masses for the effects of photoionising (PI) feedback and compare to the results of a full ionisation hydrodynamics code. Results. We present results of our simulations of star formation in the spiral arm of a disk galaxy, including the effects of photoionising radiation from high mass stars. We find that PI feedback reduces the total mass accreted onto stellar clusters by approximately 23 per cent over the course of the simulation and reduces the number of high mass clusters, as well as the maximum mass attained by a stellar cluster. Mean star formation rates (SFRs) drop from 0.042 solar masses per year in our control run to 0.032 solar masses per year after the inclusion of PI feedback with a final instantaneous SFR reduction of 62 per cent. The overall cluster mass distribution appears to be affected little by PI feedback. Conclusions. We compare our results to the observed extra-galactic Schmidt-Kennicutt relation and the observed properties of local star forming regions in the Milky Way and find that internal photoionising (PI) feedback is unlikely to reduce star formation rates by more than a factor of approximately 2 and thus may play only a minor role in regulating star formation.
description: 10 pages, 11 figures, A&A, in press
Reply to "comment on 'Level structure of Rh92: Implications for the two-proton decay of 94Agm'"
Creators: name: Chiara, C.J.
name: Lister, C.J.
name: Seweryniak, D.
name: Reviol, W.
name: Sarantites, D.G.
name: Pechenaya, O.L.
name: Janssens, R.V.F.
Publisher: name: American Physical Society
Year: 2008

description: We reply to the preceding Comment.
Rotation-aligned coupling in Fe61
Creators: name: Stone, J.R.
name: Janssens, R.V.F.
name: Broda, R.
name: Królas, W.
name: Lauritsen, T.
name: Wang, X.
name: Wöhr, A.
name: Hjorth-Jensen, M.
name: Hoteling, N.
name: Hecht, A.A.
name: Zhu, S.
name: Walters, W.B.
name: Pawłat, T.
name: Wrzesiński, J.
name: Seweryniak, D.
name: Carpenter, M.P.
name: Fornal, B.
Publisher: name: American Physical Society
Year: 2008

description: New levels have been established above the 861-keV, 9/2+ isomeric state in Fe61. The observations can be reproduced satisfactorily by shell model calculations, but only after a significant lowering of the νg9/2 single-particle energy with respect to the value determined empirically from levels outside a Ca48 core. The results are also described well within the scope of the particle-triaxial-rotor model assuming a deformation β2~0.24. The present findings, together with the recently measured magnetic and quadrupole moments of this state, point toward a structure possibly associated with a prolate shape.
Dirac hydrodynamics in 19 forms
Creators: name: Fabbri, Luca
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the relativistic spinor field theory re-formulated in polar variables so to allow for the interpretation given in terms of fluid variables. After that the dynamics of spinor fields is converted as dynamics of a special type of spin fluid, we demonstrate that such conversion into dynamical spin fluid is not unique but it can be obtained through $19$ different rearrangements, by explicitly showing the $19$ minimal systems of hydrodynamic equations that are equivalent to the Dirac equations.
description: 9 pages --- at https://www.mdpi.com/2073-8994/15/9/1685 in the Special Issue "Dirac Equations and Quantum Mechanics -- in Memory of Paul Adrien Maurice Dirac's 120-th Birthday"
Search for strongly deformed structures and observation of multiple nucleon alignments in W174
Creators: name: Knox, A.J.
name: Parnell-Lampen, C.
name: Janssens, R.V.F.
name: Seweryniak, D.
name: Khoo, T.L.
name: Carpenter, M.P.
name: Tandel, U.S.
name: Wang, X.
name: Lister, C.J.
name: Chowdhury, P.
name: Zhu, S.
name: Lauritsen, T.
name: Hartley, D.J.
name: Tandel, S.K.
name: Zhang, J.-Y.
Publisher: name: American Physical Society
Year: 2008

description: Highly excited states, up to spin 39, have been established in W174, using the Gammasphere array. Ultimate cranker calculations predict the appearance of triaxial, strongly deformed structures above spin 30 in W174. A new approach was developed for a comprehensive search of the data for such structures, similar to those observed in the Lu and Hf isotopes. No evidence was found for strongly deformed bands in the W isotopes populated in this experiment. Existing rotational structures have been considerably extended, allowing for the observation of both neutron and proton alignments in a number of bands. There is evidence for the i13/2 neutron and possibly both the h9/2 and h11/2 proton crossings. The observed neutron and proton crossing frequencies are in good agreement with predictions of Woods-Saxon cranking calculations using an empirical pair-gap energy, and they lead to an improved understanding of the underlying structure of the bands.
title: Ανάπτυξη εφαρμογής κοινωνικής δικτύωσης για κινητές συσκευές σε React Native με παροχή υπηρεσιών μέσω API βασισμένο σε GraphQL
title: Mobile social app development in React Native with GraphQL-based API service provisioning
titleType: AlternativeTitle
Creators: name: Σταυγιανουδάκης, Ιωάννης
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Android
Ios
React native
Social app
GraphQL

description: Η παρούσα διπλωματική εργασία ασχολείται με την ανάπτυξη μιας εφαρμογής κοινωνικής δικύωσης για κινητές συσκευές με χρήση με χρήση της React Native, ενος cross-platform framework οπου θα αναλυθεί η διαφορά ενός cross-platform framework και ενος native platform framework. Ακόμα για την παροχή υπηρεσιών θα γίνεται μέσω API και θα είναι βασισμένο σε GraphQL όπου και εδώ θα αναλυθούν οι διάφορες υπηρεσίες API και τι μπορεί να προσφέρει η κάθε μια.
The hyperbolic field theory on the plane of double variable
Creators: name: Pavlov, Dmitry
name: Kokarev, Sergey
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: By analogy to the theory of harmonic fields on the complex plane, we build the theory of wave-like fields on the plane of double variable. We construct the hyperbolic analogues of point vortices, sources, vortice-sources and their higher-order multipole generalizations. We examine the physical aspects and the possibility of extension to the space of polynumbers of higher dimensions.
description: 51 pages, 27 figures
Natural orbit approximations in single power-law potentials
Creators: name: Struck, Curtis
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: In a previous paper, I demonstrated the accuracy of simple, precessing, power ellipse (p-ellipse) approximations to orbits of low-to-moderate eccentricity in power-law potentials. Here I explore several extensions of these approximations to improve accuracy, especially for nearly radial orbits. 1) It is found that moderately improved orbital fits can be achieved with higher order perturbation expansions (in eccentricity), with the addition of `harmonic' terms to the solution. 2) Alternately, a matching of the extreme radial excursions of an orbit can be imposed, and a more accurate estimate of the eccentricity parameter is obtained. However, the error in the precession frequency is usually increased. 3) A correction function of small magnitude corrects the frequency problem. With this correction, even first order approximations yield excellent fits at quite high eccentricity over a range of potential indices that includes flat and falling rotation curve cases. 4) Adding a first harmonic term to fit the breadth of the orbital loops, and determining the fundamental and harmonic coefficients by matching to three orbital positions further improves the fit. With a couple of additional small corrections one obtains excellent fits to orbits with radial ranges of more than a thousand for some potentials. These simple corrections to the basic p-ellipse are basically in the form of several successive approximations, and can provide high accuracy. They suggest new results including that the apsidal precession rate scales approximately as $log(1-e)$ at very high eccentricities $e$. New insights are also provided on the occurrence of periodic orbits in various potentials, especially at high eccentricity.
description: 12 pages, 8 figures, MNRAS accepted, typos and minor grammatical errors corrected in resubmission
Large anisotropic thermal conductivity of intrinsically two-dimensional metallic oxide PdCoO$_2$
Creators: name: Daou, Ramzy
name: Frésard, Raymond
name: Hébert, Sylvie
name: Maignan, Antoine
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The highly conductive layered metallic oxide \pdcoo{} is a near-perfect analogue to an alkali metal in two dimensions. It is distinguished from other two-dimensional electron systems where the Fermi surface does not reach the Brillouin zone boundary by a high planar electron density exceeding $10^{15}$ cm$^{-2}$. The simple single-band quasi-2D electronic structure results in strongly anisotropic transport properties and limits the effectiveness of electron-phonon scattering. Measurements on single crystals in the temperature range from 10-300K show that the thermal conductivity is much more weakly anisotropic than the electrical resistivity, as a result of significant phonon heat transport. The in-plane thermoelectric power is linear in temperature at 300\,K and displays a purity-dependent peak around 50K. Given the extreme simplicity of the band-structure, it is possible to identify this peak with phonon drag driven by normal electron-phonon scattering processes.
description: 3 figures
Resonating Valence Bond Quantum Monte Carlo: Application to the ozone molecule
Creators: name: Azadi, Sam
name: Singh, Ranber
name: Kühne, Thomas D.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the potential energy surface of the ozone molecule by means of Quantum Monte Carlo simulations based on the resonating valence bond concept. The trial wave function consists of an antisymmetrized geminal power arranged in a single-determinant that is multiplied by a Jastrow correlation factor. Whereas the determinantal part incorporates static correlation effects, the augmented real-space correlation factor accounts for the dynamics electron correlation. The accuracy of this approach is demonstrated by computing the potential energy surface for the ozone molecule in three vibrational states: symmetric, asymmetric and scissoring. We find that the employed wave function provides a detailed description of rather strongly-correlated multi-reference systems, which is in quantitative agreement with experiment.
description: 5 page, 3 figures
Fair Division and Redistricting
Creators: name: Landau, Zeph
name: Su, Francis Edward
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: Primary 91F10, Secondary 91B32, 91B12

description: Recently, Landau, Reid and Yershov provided a novel solution to the problem of redistricting. Instead of trying to ensure fairness by restricting the shape of the possible maps or by assigning the power to draw the map to nonbiased entities, the solution ensures fairness by balancing competing interests against each other. This kind of solution is an example of what are known as "fair division" solutions--- such solutions involve the preferences of all parties and are accompanied by rigorous guarantees of a specified well-defined notion of fairness. In this expository article, we give an introduction to the ideas of fair division in the context of this redistricting solution. Through examples and discussion we clarify how fair division methods can play an important role in a realistic redistricting solution by introducing an interactive step that incorporates a certain kind of fairness that can be used in concert with, and not a substitute for, other necessary or desired criteria for a good redistricting solution.
description: 20 pages; to appear, Contemporary Mathematics
Fifty Years of Quasars: Physical Insights and Potential for Cosmology
Creators: name: Sulentic, J. W.
name: Marziani, P.
name: Dultzin, D.
name: D'Onofrio, M.
name: del Olmo, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Last year (2013) was more or less the 50th anniversary of the discovery of quasars. It is an interesting time to review what we know (and don't know) about them both empirically and theoretically. These compact sources involving line emitting plasma show extraordinary luminosities extending to one thousand times that of our Milky Way in emitting volumes of a few solar system diameters (bolometric luminosity log L$_{bol} \sim $ 44-48 [erg s$^{-1}$]: D=1-3 light months $\sim$ $10^3$ - $10^4$ gravitational radii). The advent of 8-10 meter class telescopes enables us to study them spectroscopically in ever greater detail. In 2000 we introduced a 4D Eigenvector 1 parameters space involving optical, UV and X-Ray measures designed to serve as a 4D equivalent of the 2D Hertzsprung-Russell diagram so important for depicting the diversity of stellar types and evolutionary states. This diagram has revealed a principal sequence of quasars distinguished by Eddington ratio (proportional to the accretion rate per unit mass). Thus while stellar differences are primarily driven by the mass of a star, quasar differences are apparently driven by the ratio of luminosity-to-mass. Out of this work has emerged the concept of two quasars populations A and B separated at Eddington ratio around 0.2 which maximizes quasar multispectral differences. The mysterious 8% of quasars that are radio-loud belong to population B which are the lowest accretors with the largest black hole masses. Finally we consider the most extreme population A quasars which are the highest accretors and in some cases are among the youngest quasars. We describe how these sources might be exploited as standard candles for cosmology.
description: Accepted for publication in Journal of Physics Conference Series (10 pages, 4 figures). Invited Lecture at International Symposium on the Physics of Ionized Gas (SPIG 2014), Belgrade 26-29 August 2014
A new approach to the $2$-regularity of the $\ell$-abelian complexity of $2$-automatic sequences
Creators: name: Parreau, Aline
name: Rigo, Michel
name: Rowland, Eric
name: Vandomme, Elise
Publisher: name: arXiv
Year: 2014
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 11B85, 68R15, 68Q70

description: We prove that a sequence satisfying a certain symmetry property is $2$-regular in the sense of Allouche and Shallit, i.e., the $\mathbb{Z}$-module generated by its $2$-kernel is finitely generated. We apply this theorem to develop a general approach for studying the $\ell$-abelian complexity of $2$-automatic sequences. In particular, we prove that the period-doubling word and the Thue--Morse word have $2$-abelian complexity sequences that are $2$-regular. Along the way, we also prove that the $2$-block codings of these two words have $1$-abelian complexity sequences that are $2$-regular.
description: 44 pages, 2 figures; publication version
Structure of He7 by proton removal from Li8 with the (d,3He) reaction
Creators: name: Pardo, R.C.
name: Savard, G.
name: Janssens, R.V.F.
name: Greene, J.P.
name: Paul, M.
name: Schiffer, J.P.
name: Siemssen, R.H.
name: Lighthall, J.C.
name: Peterson, D.
name: Segel, R.E.
name: Patel, N.
name: Tang, X.D.
name: Jiang, C.L.
name: Rehm, K.E.
name: Henderson, D.J.
name: Marley, S.T.
name: Jisonna, L.
name: Moore, E.F.
name: Pieper, S.C.
name: Wiringa, R.B.
name: Wuosmaa, A.H.
Publisher: name: American Physical Society
Year: 2008

description: We report on a study of the structure of the unbound nucleus He7 utilizing the proton-removal reaction 2H(8Li,3He)7He. Combining the present results with those of our prior measurements of the neutron-adding reaction 2H(6He,p)7He, a consistent picture emerges for the low-lying excitations in He7. Specifically, the negative-parity sequence of resonances, in order of excitation energies, is consistent with 3/2-,1/2-, and 5/2-. The stable-beam reactions 2H(7Li,t)6Li and 2H(7Li,3He)6He were also measured. The results are compared with the predictions of nuclear structure models, including those of ab initio quantum Monte Carlo calculations.
H$_2$ Lyman and Werner band lines and their sensitivity for a variation of the proton-electron mass ratio in the gravitational potential of white dwarfs
Creators: name: Salumbides, E. J.
name: Bagdonaite, J.
name: Abgrall, H.
name: Roueff, E.
name: Ubachs, W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Recently an accurate analysis of absorption spectra of molecular hydrogen, observed with the Cosmic Origins Spectrograph aboard the Hubble Space Telescope, in the photosphere of white dwarf stars GD133 and GD29-38 was published in a Letter [Phys. Rev. Lett. 113, 123002 (2014)], yielding a constraint on a possible dependence of the proton-electron mass ratio on a gravitational field of strength 10,000 times that at the Earth's surface. In the present paper further details of that study are presented, in particular a re-evaluation of the spectrum of the $B^1Σ_u^+ - X^1Σ_g^+ (v',v'')$ Lyman bands relevant for the prevailing temperatures (12,000 - 14,000 K) of the photospheres. An emphasis is on the calculation of so-called $K_i$-coefficients, that represent the sensitivity of each individual line to a possible change in the proton-electron mass ratio. Such calculations were performed by semi-empirical methods and by ab initio methods providing accurate and consistent values. A full listing is provided for the molecular physics data on the Lyman bands (wavelengths $λ_i$, line oscillator strengths $f_i$, radiative damping rates $Γ_i$, and sensitivity coefficients $K_i$) as required for the analyses of H$_2$-spectra in hot dwarf stars. A similar listing of the molecular physics parameters for the $C^1Π_u - X^1Σ_g^+ (v',v'')$ Werner bands is provided for future use in the analysis of white dwarf spectra.
What are little worlds made of? Stellar abundances and the building blocks of planets
Creators: name: Gaidos, Eric
Publisher: name: arXiv
Year: 2015
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: If the photospheres of solar-type stars represent the composition of circumstellar disks from which any planets formed, spectroscopic determinations of stellar elemental abundances offer information on the composition of those planets, including smaller, rocky planets. In particular, the C/O ratio is proposed to be a key determinant of the composition of solids that condense from disk gas and are incorporated into planets. Also, planets may leave chemical signatures on the photospheres of their host stars by sequestering heavy elements, or by being accreted by the stars. The presence, absence, and composition of planets could be revealed by small differences in the relative abundances between stars. I critically examine these scenarios and show that (i) a model of Galactic chemical evolution predicts that the C/O ratio is expected to be close to the solar value and vary little between dwarf stars in the solar neighborhood; (ii) spectroscopic surveys of M dwarf stars limit the occurrence of stars with C/O $\gtrsim 1$ to $<10^{-3}$; and (iii) planetesimal chemistry will be controlled by the composition of oxygen-rich dust inherited from the molecular cloud and processed in a dust-rich environment, not a gas with the stellar composition. A second generation of more reduced planetesimals could be produced by re-equilibration of some material with dust-depleted gas. Finally, I discuss how minor differences in relative abundances between stars that correlate with condensation temperature can be explained by dust-gas segregation, perhaps in circumstellar disks, rather than planet formation.
description: ApJ, in press
Waterfilling Theorems for Linear Time-Varying Channels and Related Nonstationary Sources
Creators: name: Hammerich, Edwin
Publisher: name: arXiv
Year: 2015
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The capacity of the linear time-varying (LTV) channel, a continuous-time LTV filter with additive white Gaussian noise, is characterized by waterfilling in the time-frequency plane. Similarly, the rate distortion function for a related nonstationary source is characterized by reverse waterfilling in the time-frequency plane. Constraints on the average energy or on the squared-error distortion, respectively, are used. The source is formed by the white Gaussian noise response of the same LTV filter as before. The proofs of both waterfilling theorems rely on a Szego theorem for a class of operators associated with the filter. A self-contained proof of the Szego theorem is given. The waterfilling theorems compare well with the classical results of Gallager and Berger. In the case of a nonstationary source, it is observed that the part of the classical power spectral density is taken by the Wigner-Ville spectrum. The present approach is based on the spread Weyl symbol of the LTV filter, and is asymptotic in nature. For the spreading factor, a lower bound is suggested by means of an uncertainty inequality.
description: 13 pages, 5 figures; channel model in Section III now restricted to LTV filters with real-valued kernel
Avoiding fractional powers over the natural numbers
Creators: name: Pudwell, Lara
name: Rowland, Eric
Publisher: name: arXiv
Year: 2015
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We study the lexicographically least infinite $a/b$-power-free word on the alphabet of non-negative integers. Frequently this word is a fixed point of a uniform morphism, or closely related to one. For example, the lexicographically least $7/4$-power-free word is a fixed point of a $50847$-uniform morphism. We identify the structure of the lexicographically least $a/b$-power-free word for three infinite families of rationals $a/b$ as well many "sporadic" rationals that do not seem to belong to general families. To accomplish this, we develop an automated procedure for proving $a/b$-power-freeness for morphisms of a certain form, both for explicit and symbolic rational numbers $a/b$. Finally, we establish a connection to words on a finite alphabet. Namely, the lexicographically least $27/23$-power-free word is in fact a word on the finite alphabet $\{0, 1, 2\}$, and its sequence of letters is $353$-automatic.
description: 42 pages, 5 figures; publication version
The effect of using concept maps on advancing students conceptual understanding of Euler circuit
Creators: name: Serhan, Derar
name: Syam, Muhammed
name: AlMdallal, Qasem
Publisher: name: arXiv
Year: 2014
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics

description: This study investigated the use of concept maps on advancing students conceptual understanding of the Euler Circuit concept. The participants were students at the college of Humanities and Social Sciences with a background in Art. A pre-treatment test was given to students during the eleventh week of the semester, while a post-treatment test was given during the fourteenth week. The study reports the findings from the responses of eighty three participants who took both the pre- and post-treatment test. The results of this study indicated that students, after using concept maps, had a richer conceptual understanding of the Euler circuit concept and were capable of constructing more representations of this concept.
description: 7 pages, 1 figure, 2 tables, Published with International Journal of Mathematics Trends and Technology (IJMTT)