cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of: Norden (Brigantine)
Creators: name: Davies, Gareth J.S.
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Norden was a cargo brigantine which from available records sailed between ports in Norway, Baltic Ports of Denmark, Sweden, Finland, Russia, Estonia, France, S and W Wales, Scotland, N.E. England, Newfoundland. Cargoes carried included raw materials and timber. On Sep 18 th 1887, the Norden ran aground in bad weather at Pen-y-Ergyd, Cardigan Wales.
PSR J1709-4429's Proper Motion and its Relationship to SNR G343.1-2.3
Creators: name: de Vries, Martijn
name: Romani, Roger W.
name: Kargaltsev, Oleg
name: Pavlov, George
name: Posselt, Bettina
name: Slane, Patrick
name: Bucciantini, Niccolo'
name: Ng, Stephen
name: Klingler, Noel
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We have obtained a deep 670 ks CXO ACIS image of the remarkable pulsar wind nebula (PWN) of PSR J1709-4429, in 4 epochs during 2018-2019. Comparison with an archival 2004 data set provides a pulsar proper motion mu = 13 \pm 3 mas/yr at a PA of 86 \pm 9 degree (1 sigma combined statistical and systematic uncertainties), precluding birth near the center of SNR G343.1-2.3. At the pulsar's characteristic age of 17 kyr, the association can be preserved through a combination of progenitor wind, birth kick and PWN outflow. Associated TeV emission may, however, indicate explosion in an earlier supernova. Inter-epoch comparison of the X-ray images shows that the PWN is dynamic, but we are unable to conclusively measure flow speeds from blob motion. The pulsar has generated a radio/X-ray wind bubble, and we argue that the PWN's long narrow jets are swept back by shocked pulsar wind venting from this cavity. These jets may trace the polar magnetic field lines of the PWN flow, an interesting challenge for numerical modeling.
description: 11 pages, 8 figures. Accepted for publication in the Astrophysical Journal
The Mean Curvature of Transverse K\"ahler Foliations
Creators: name: Jung, Seoung Dal
name: Richardson, Ken
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2019

description: We study properties of the mean curvature one-form and its holomorphic and antiholomorphic cousins on a transverse K\"ahler foliation. If the mean curvature of the foliation is automorphic, then there are some restrictions on basic cohomology similar to that on K\"ahler manifolds, such as the requirement that the odd basic Betti numbers must be even. However, the full Hodge diamond structure does not apply to basic Dolbeault cohomology unless the foliation is taut.
description: DOCUMENTA MATHEMATICA, Vol 24 (2019), p. 995-1031
Non-periodic pseudo-random numbers used in Monte Carlo calculations
Creators: name: Barberis, Gaston E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The generation of pseudo-random numbers is one of the interesting problems in Monte Carlo simulations, mostly because the common computer generators produce periodic numbers. We used simple pseudo-random numbers generated with the simplest chaotic system, the logistic map, with excellent results. The numbers generated in this way are non-periodic, which we demonstrated for 10$^{13}$ numbers, and they are obtained in a deterministic way, which allows to repeat systematically any calculation. The Monte Carlo calculations are the ideal field to apply these numbers, and we did it for simple and more elaborated cases. Chemistry and Information Technology use this kind of simulations, and the application of this numbers to Quantum Monte Carlo and Cryptography is immediate. I present here the techniques to calculate, analyze and use these pseudo-random numbers, show that they lack periodicity up to 10$^{13}$ numbers and that they are not correlated.
Spectral Phase Transitions in Optical Parametric Oscillators
Creators: name: Roy, Arkadev
name: Jahani, Saman
name: Langrock, Carsten
name: Fejer, Martin
name: Marandi, Alireza
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Spectral behaviors of photonic resonators have been the basis for a range of fundamental studies, with applications in classical and quantum technologies. Driven nonlinear resonators provide a fertile ground for phenomena related to phase transitions far from equilibrium, which can open opportunities unattainable in their linear counterparts. Here, we show that optical parametric oscillators (OPOs) can undergo second-order phase transitions in the spectral domain between degenerate and non-degenerate regimes. This abrupt change in the spectral response follows a square-root dependence around the critical point, exhibiting high sensitivity to parameter variation akin to systems around an exceptional point. We experimentally demonstrate such a phase transition in a quadratic OPO, map its dynamics to the universal Swift-Hohenberg equation, and extend it to Kerr OPOs. To emphasize the fundamental importance and consequences of this phase transition, we show that the divergent susceptibility of the critical point is accompanied by spontaneous symmetry breaking and distinct phase noise properties in the two regimes, indicating the importance of a beyond nonlinear bifurcation interpretation. We also predict the occurrence of first-order spectral phase transitions in coupled OPOs. Our results on non-equilibrium spectral behaviors can be utilized for enhanced sensing, advanced computing, and quantum information processing.
Αξιολόγηση των προβλημάτων συμπεριφοράς των παιδιών προσχολικής ηλικίας: η σχέση με την ποιότητα του προσχολικού περιβάλλοντος, το φύλο και την καταγωγή των παιδιών.
Creators: name: Γούλα, Κατερίνα Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: προβλήματα συμπεριφοράς
ποιότητα προσχολικού περιβάλλοντος
φύλο και καταγωγή
behavior problems
early childhood education quality
gender and origin

description: Η παρούσα εργασία επιχειρεί να περιγράψει τον τρόπο με τον οποίο η ποιότητα του προσχολικού περιβάλλοντος, το φύλο και η καταγωγή των παιδιών επηρεάζουν την εκδήλωση προβλημάτων συμπεριφοράς στην προσχολική ηλικία. Για το σκοπό αυτό πραγματοποιήθηκε αξιολόγηση σε 50 τάξεις νηπιαγωγείων και παιδικών σταθμών του νομού Θεσσαλονίκης σε ένα δείγμα 341 παιδιών (Ν=341) που φοιτούσαν σε αυτές. Η παρατήρηση και η αξιολόγηση των τάξεων έγινε από ειδικά καταρτισμένες ερευνήτριες, με βάση την κλίμακα ECERS-R, και η αξιολόγηση της συμπεριφοράς των παιδιών από τις εκπαιδευτικούς της τάξης, με χρήση του καταλόγου συμπεριφοράς ΚΕΣΠΗ-Α. Τα αποτελέσματα έδειξαν αυξημένο βαθμό εκδήλωσης προβλημάτων εξωτερίκευσης για τα αγόρια σε σχέση με τα κορίτσια, ενώ σε γενικές γραμμές δεν εντοπίστηκαν στατιστικά σημαντικές διαφορές στο βαθμό εκδήλωσης προβλημάτων συμπεριφοράς από παιδιά ελληνικής και ξένης καταγωγής. Τέλος, η υψηλή ποιότητα του προσχολικού περιβάλλοντος (και συγκεκριμένα των ρουτίνων προσωπικής φροντίδας και των αλληλεπιδράσεων) φάνηκε να περιορίζει την εκδήλωση προβλημάτων άγχους και διασπαστικής συμπεριφοράς
description: The current study examines the relation between gender, national origin, early childhood environment quality and behavior problems of preschool children. Using a sample of 50 preschool classrooms and 341 students (N=341), trained researchers evaluated the early childhood education quality and preschool teachers the level of problem behavior of their students. For the purpose of the aforementioned evaluations, translated and adapted versions of ECERS-R and PCBL were implemented. The findings from the research supported the prediction of gender differences in externalizing behavior problems by demonstrating higher level of disruptive behavior among male preschoolers. In terms of national origin and behavior problems, very limited differences were noted between Greek and non native-born children. Regarding early childhood education and problem behavior, the findings suggested that personal care routines and interactions of high quality might limit the levels of disruptive behavior and anxiety among preschool students. The results and future research proposals are further discussed.
Imaginary Time Mean-Field Method for Collective Tunneling
Creators: name: McGlynn, Patrick
name: Simenel, Cedric
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Background: Quantum tunneling in many-body systems is the subject of many experimental and theoretical studies in fields ranging from cold atoms to nuclear physics. However, theoretical description of quantum tunneling with strongly interacting particles, such as nucleons in atomic nuclei, remains a major challenge in quantum physics. Purpose: An initial-value approach to tunneling accounting for the degrees of freedom of each interacting particle is highly desirable. Methods: Inspired by existing methods to describe instantons with periodic solutions in imaginary time, we investigate the possibility to use an initial value approach to describe tunneling at the mean-field level. Real-time and imaginary-time Hartree dynamics are compared to the exact solution in the case of two particles in a two-well potential. Results: Whereas real-time evolutions exhibit a spurious self-trapping effect preventing tunneling in strongly interacting systems, the imaginary-time-dependent mean-field method predicts tunneling rates in excellent agreement with the exact solution. Conclusions: Being an initial-value method, it could be more suitable than approaches requiring periodic solutions to describe realistic systems such as heavy-ion fusion.
description: Accepted for publication in PRC
The structure of the hydrated electron. Part 2. A mixed quantum classical molecular dynamics - embedded cluster density functional theory: single-excitation configuration interaction study
Creators: name: Shkrob, Ilya A.
name: Glover, William J.
name: Larsen, Ross E.
name: Schwartz, Benjamin J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Adiabatic mixed quantum/classical molecular dynamics simulations were used to generate snapshots of the hydrated electron (e-) in liquid water at 300 K. Water cluster anions that include two complete solvation shells centered on the e- were extracted from these simulations and embedded in a matrix of fractional point charges designed to represent the rest of the solvent. Density functional theory and single-excitation configuration interaction methods were then applied to these embedded clusters. The salient feature of these hybrid calculations is significant transfer (ca. 0.18) of the excess electron's charge density into the O 2p orbitals in OH groups forming the solvation cavity. We used the results of these calculations to examine the structure of the molecular orbitals, the density of states, the absorption spectra in the visible and ultraviolet, the hyperfine coupling (hfc) tensors, and the IR and Raman spectra of the e-. The calculated hfc tensors were used to compute the EPR and ESEEM spectra for the e- that compared favorably to the experimental spectra of trapped e- in alkaline ice. The calculated vibrational spectra of the e- are consistent with the red-shifted bending and stretching frequencies observed in resonance Raman experiments. The model also accounts for the VIS and 190-nm absorption bands of the e-. Thus, our study suggests that to explain several important experimentally observed properties of the e-, many-electron effects must be accounted for.
description: 68 pages, 12 figures + 16 more figures in the supplement (included) submitted to J Phys Chem A
Η δραματουργία της Στέλλας Μιχαηλίδου
Creators: name: Παπαδοπούλου, Ειρήνη Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Δραματολογική προσέγγιση
Θέατρο για παιδιά και νέους
Κοινό ανήλικων θεατών
Dramaturgical approach
Theater for children and young people
Young audience

description: Θέμα της παρούσας εργασίας είναι η δραματολογική προσέγγιση των θεατρικών έργων της Στέλλας Μιχαηλίδου. Τα τρία αμιγώς θεατρικά έργα της, το Περπατώ εις το δάσος, το Όνειρο του Ρο, και η Τζιτζιμιτζιχοτζιριά, αποτελούν το αντικείμενο της μελέτης μας. Επιχειρούμε να τα εξετάσουμε ως δραματικά κείμενα που απευθύνονται σε παιδιά και νέους και που από τη φύση τους πατούν από τη μια στο χώρο της λογοτεχνίας και από την άλλη στην παραστατική τέχνη του θεάτρου. Διερευνούμε λοιπόν τα μορφολογικά, δομικά, δραματουργικά και ιδεολογικά χαρακτηριστικά τους που θεωρούμε ότι ανταποκρίνονται στις προσδοκίες και τις προσλαμβάνουσες του σύγχρονου κοινού ανηλίκων θεατών. Η μελέτη και η διερεύνηση των έργων προσπαθεί να τεκμηριώσει -με αυστηρά καθορισμένα και οριοθετημένα από τη θεατρολογική επιστήμη κριτήρια- την ένταξη και τη θέση της συγγραφέα στους νεότερους και αξιολογότερους εκπροσώπους του θεάτρου για παιδιά και νέους στη χώρα μας.
description: The dramaturgical approach of Stella Michailidou's three plays (Walking in the forest, The dream of Ro and Tzitzimitzichotziria) is the subject of this essay. We will try to examine the above plays as dramatic texts for children and young people which in their essence they bare both literary and theatrical qualities. Therefore we will research the morphological, structural, dramaturgical and ideological characteristics that according to our consideration they meet the expectations and perceptions of contemporary young audience. Researching Michailidou's works we will try to point out -based on strictly defined theatrological criteria- that the author is among the youngest and most notable representatives of the theater for children and youth in our country.
Organized Current Patterns in Disordered Conductors
Creators: name: Japha, Y.
name: Entin-Wohlman, O.
name: David, T.
name: Salem, R.
name: Aigner, S.
name: Schmiedmayer, J.
name: Folman, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a general theory of current deviations in straight current carrying wires with random imperfections, which quantitatively explains the recent observations of organized patterns of magnetic field corrugations above micron-scale evaporated wires. These patterns originate from the most efficient electron scattering by Fourier components of the wire imperfections with wavefronts along the $\pm 45^{\circ}$ direction. We show that long range effects of surface or bulk corrugations are suppressed for narrow wires or wires having an electrically anisotropic resistivity.
Big Bang Nucleosynthesis constraints on Barrow entropy
Creators: name: Barrow, John D.
name: Basilakos, Spyros
name: Saridakis, Emmanuel N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We use Big Bang Nucleosynthesis (BBN) data in order to impose constraints on the exponent of Barrow entropy. The latter is an extended entropy relation arising from the incorporation of quantum-gravitational effects on the black-hole structure, parameterized effectively by the new parameter $Δ$. When considered in a cosmological framework and under the light of the gravity-thermodynamics conjecture, Barrow entropy leads to modified cosmological scenarios whose Friedmann equations contain extra terms. We perform a detailed analysis of the BBN era and we calculate the deviation of the freeze-out temperature comparing to the result of standard cosmology. We use the observationally determined bound on $ |\frac{δ{T}_f}{{T}_f}|$ in order to extract the upper bound on $Δ$. As we find, the Barrow exponent should be inside the bound $Δ\lesssim 1.4\times 10^{-4}$ in order not to spoil the BBN epoch, which shows that the deformation from standard Bekenstein-Hawking expression should be small as expected.
description: 6 pages, 1 figure
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: North Carolina
Creators: name: Perks, Graeme
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The steamship North Carolina was built in Philadelphia in 1854 by Vaughan and Fisher with the machinery supplied by Merrick and Sons for Alexander Heron Jr of Philadelphia, intended to carry cargo and passenger between Philadelphia and Wilmington N C. The North Carolina was soon found to be uneconomic for this route and sailed for Liverpool to be sold in February. The North Carolina was damaged in five days of gales and returned for repair. The North Carolina set off again for Liverpool in March but on April 8 1855 collided with the barque Robert 30 miles off the Tuskar lighthouse and sank. The crew of the North Carolina were rescued by the Robert ,which returned to Liverpool for repair, and another vessel.
On the metallicity dependence of HMXBs
Creators: name: Dray, L. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is commonly assumed that high mass X-ray binary (HMXB) populations are little-affected by metallicity. However, the massive stars making up their progenitor systems depend on metallicity in a number of ways, not least through their winds. We present simulations, well-matched to the observed sample of Galactic HMXBs, which demonstrate that both the number and the mean period of HMXB progenitors can vary with metallicity, with the number increasing by about a factor of three between solar and SMC metallicity. However, the SMC population itself cannot be explained simply by metallicity effects; it requires both that the HMXBs observed therein primarily sample the older end of the HMXB population, and that the star formation rate at the time of their formation was very large.
description: 13 pages, 6 figures, MNRAS accepted
Bose-Einstein condensates in accelerated double-periodic optical lattices: Coupling and Crossing of resonances
Creators: name: Witthaut, D.
name: Graefe, E. M.
name: Wimberger, S.
name: Korsch, H. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the properties of coupled linear and nonlinear resonances. The fundamental phenomena and the level crossing scenarios are introduced for a nonlinear two-level system with one decaying state, describing the dynamics of a Bose-Einstein condensate in a mean-field approximation (Gross-Pitaevskii or nonlinear Schroedinger equation). An important application of the discussed concepts is the dynamics of a condensate in tilted optical lattices. In particular the properties of resonance eigenstates in double-periodic lattices are discussed, in the linear case as well as within mean-field theory. The decay is strongly altered, if an additional period-doubled lattice is introduced. Our analytic study is supported by numerical computations of nonlinear resonance states, and future applications of our findings for experiments with ultracold atoms are discussed.
description: 12 pages, 17 figures
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Barque Oberon
Creators: name: Whitewright, Malcolm
Publisher: name: Archaeology Data Service
Year: 2023

description: Welsh Wreck Web Research Project unpublished report series, 1
description: This project is to discover information relating to the reported wreck of the Barque Oberon (MADU Ref. 149) for which there are several newspaper archived reports of it having gone aground on 1 st April 1860 on St Patrick's Causeway (Sarn Badrig), Cardigan Bay, Wales.
Stand der Erfassung der erweiterten tatsächlichen Nutzung und die Ableitung der Landnutzung in Sachsen-Anhalt
Creators: name: Koban, Matthias
Publisher: name: Zenodo
Year: 2022
Subjects: Liegenschaftskataster
Flächennutzung
Tatsächliche Nutzung
ALKIS

description: Präsentation des Landesamt für Vermessung und Geoinformation Sachsen-Anhalt anlässlich des dritten Begleitkreises des UBA-Projektes "Konsistenz und Aussagefähigkeit von Flächendaten".
Neutrinoless double beta decay
Creators: name: Vogel, Petr
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The status of the search for neutrinoless double beta decay is reviewed. The effort to reach the sensitivity needed to cover the effective Majorana neutrino mass corresponding to the degenerate and inverted mass hierarchy is described. Various issues concerning the theory (and phenomenology) of the relation between the $0νββ$ decay rate and the absolute neutrino mass scale are discussed, in particular the issue of mechanism of the $0νββ$ decay. Finally, the relation between the neutrino magnetic moments and the charge conjugation property (Dirac vs. Majorana) is described.
description: Lecture notes at TASI2006, Boulder, CO, June 2006; to be published in proceedings
Nonclassicality of quantum excitation of classical coherent field in photon loss channel
Creators: name: Li, Shang-Bin
name: Zou, Xu-Bo
name: Guo, Guang-Can
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the nonclassicality of photon-added coherent states in the photon loss channel by exploring the entanglement potential and negative Wigner distribution. The total negative probability defined by the absolute value of the integral of the Wigner function over the negative distribution region reduces with the increase of decay time. The total negative probability and the entanglement potential of pure photon-added coherent states exhibit the similar dependence on the beam intensity. The reduce of the total negative probability is consistent with the behavior of entanglement potential for the dissipative single-photon-added coherent state at short decay times.
description: 5 pages, 5 figures, RevTex4, submitted
Time-Space Noncommutativity in Gravitational Quantum Well scenario
Creators: name: Saha, Anirban
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A novel approach to the analysis of the gravitational well problem from a second quantised description has been discussed. The second quantised formalism enables us to study the effect of time space noncommutativity in the gravitational well scenario which is hitherto unavailable in the literature. The corresponding first quantized theory reveals a leading order perturbation term of noncommutative origin. Latest experimental findings are used to estimate an upper bound on the time--space noncommutative parameter. Our results are found to be consistent with the order of magnitude estimations of other NC parameters reported earlier.
description: 7 pages, revTex
Quantitative assessment of linear noise-reduction filters for spectroscopy
Creators: name: Le, L. V.
name: Kim, Y. D.
name: Aspnes, D. E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Applied Physics (physics.app-ph)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Physical sciences

description: Linear noise-reduction filters used in spectroscopy must strike a balance between reducing noise and preserving lineshapes, the two conflicting requirements of interest.
Bridging the quartet and pair pictures of isovector proton-neutron pairing
Creators: name: Baran, V. V.
name: Nichita, D. R.
name: Negrea, D.
name: Delion, D. S.
name: Sandulescu, N.
name: Schuck, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The formal implications of a quartet coherent state ansatz for proton-neutron pairing are analyzed. Its nonlinear annihilation operators, which generalize the BCS linear quasiparticle operators, are computed in the quartetting case. Their structure is found to generate nontrivial relationships between the many body correlation functions. The intrinsic structure of the quartet coherent state is detailed, as it hints to the precise correspondence between the quartetting picture and the symmetry restored pair condensate picture for the proton-neutron pairing correlations.
description: 6 pages, 1 figure
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Olivial
Creators: name: Ortel, Michael G.
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: This report serves to provide a historical look into the "life" and "death" of the British Steamship Olivial which served as a cargo ship during the late 19th Century and early 20th Century.
Uncertainty driven probabilistic voxel selection for image registration
Creators: name: Oreshkin, Boris N.
name: Arbel, Tal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: This paper presents a novel probabilistic voxel selection strategy for medical image registration in time-sensitive contexts, where the goal is aggressive voxel sampling (e.g. using less than 1% of the total number) while maintaining registration accuracy and low failure rate. We develop a Bayesian framework whereby, first, a voxel sampling probability field (VSPF) is built based on the uncertainty on the transformation parameters. We then describe a practical, multi-scale registration algorithm, where, at each optimization iteration, different voxel subsets are sampled based on the VSPF. The approach maximizes accuracy without committing to a particular fixed subset of voxels. The probabilistic sampling scheme developed is shown to manage the tradeoff between the robustness of traditional random voxel selection (by permitting more exploration) and the accuracy of fixed voxel selection (by permitting a greater proportion of informative voxels).
Initial Reports of the Deep Sea Drilling Project - Volume 72
Creators: name: Barker, P.F.
name: Carlson, R.L.
name: Johnson, D.A.
name: The Leg 72 Science Party
Publisher: name: U.S. Government Printing Office
Year: 1983
Subjects: Deep Sea Drilling Project
Glomar Challenger
DSDP
Leg 72
Site 515
Site 516
Site 517
Site 518
Southwestern Atlantic Ocean
Brazil Basin
Rio Grande Rise

description: This volume covers Leg 72 of the cruises of the Drilling Vessel Glomar Challenger. DSDP Legs 71 to 75 in the South Atlantic were designed to study the circulation and climatic consequences of the growth of a long meridional ocean. With only limited drilling time available, the drilling program had to concentrate on a few, crucial parts of this development. One factor in the choice of objectives was the availability of the hydraulic piston corer (HPC), which permitted the study of less-consolidated sediments on a fine scale. Among the more important topics were: 1) early restricted circulation in small isolated basins; 2) development of an asymmetric circulation between eastern and western basins as the ocean widened; 3) interaction with steepening zonal climatic gradients through the Late Cretaceous and Cenozoic; evolution of the present intermediate and deep water mass structure. The importance of the anomalously elevated parts of the South Atlantic was recognized at an early stage; and the Falkland Plateau, Rio Grande Rise, and Walvis Ridge attracted a high proportion of the sites. Critical objectives for paleoceanographic drilling in the Rio Grande Rise and Vema Channel region on Leg 72 include the identification of the following: 1) Time of initiation of AABW flow into the Brazil Basin and northwestern Atlantic. 2) Time of initial formation of northern sources of bottom water, perhaps due to deepening of Greenland-Scotland Ridge in the Paleogene. 3) Major pulses of AABW and NADW during the Neogene and Quaternary. 4) Effects of southern hemisphere and northern hemisphere glaciation upon the production of AAIW, NADW, and AABW. 5) Effects of critical tectonic "threshold events" upon deep thermohaline flow. Leg 72 departed from and returned to Santos, Brazil, and took place between February and April of 1980.
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Schooner Omnibus of Aberystwyth
Creators: name: Perks, Graeme
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Omnibus was a schooner, built by Frederick Preston at Great Yarmouth in 1835 and he sold it the following year to Vigurs and Company who used it to carry metal ores to their workshops in Port Talbot from Cornwall and mainly coal as a outwards cargo. Omnibus was re-registered at the Port of Swansea when it was sold in 1847,but still mainly sailed from Port Talbot, and later registered after being sold again, at Aberystwyth. Omnibus was used carrying any available cargos which still included metal ores. Omnibus suffered the mishaps of sailing vessels being blown aground by gales and being re-floated until 1869 when she hit the Half Tide rocks at St Tudwall's, Caernarfonshire during a gale and sank without loss of life.
Post-Newtonian parameters in the tensor-vector-scalar theory
Creators: name: Tamaki, Takashi
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate post-Newtonian parameters in the tensor-vector-scalar (TeVeS) theory in a general setting while previous researches have been restricted to spherically symmetric cases. Based on the assumption that both the physical and Einstein metrics have Minkowski metric at the zeroth order, we show $γ=1$ as in the previous researches. We find two remarkable things for other parameters. The first is the value $β=1$ while it has been reported that $β\neq 1$ for the case when the vector field is not purely timelike. This discrepancy occurs from the above assumption which is natural as a starting point. The second is the result that the Newtonian potential must be static to be consistent with the vector equation. As a result, we cannot determine $α_{1}$ and $α_{2}$. We consider that it is related to the instability against linear perturbation and occurrence of caustic singularities for various initial perturbations which have been reported recently.
description: 8 pages, no figures, to be published in PRD
Age and Metallicities of Cluster Galaxies: A1185 and Coma
Creators: name: Rakos, K.
name: Schombert, J.
name: Odell, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present age and metallicities determinations based on narrow band continuum colors for the galaxies in the rich clusters A1185 and Coma. Using a new technique to extract luminosity-weighted age and [Fe/H] values for non-star-forming galaxies, we find that both clusters have two separate populations based on these parameters. One population is old ($τ>$ 11 Gyrs) with a distinct mass-metallicity relation. The second population is slightly younger ($τ\approx$ 9 Gyrs) with lower metallicities and lower stellar masses. We find detectable correlations between age and galaxy mass in both populations such that older galaxies are more massive and have higher mean metallicities, confirming previous work with line indices for the same type of galaxies in other clusters (Kelson et al 2006, Thomas et al 2005). Our results imply shorter durations for higher mass galaxies, in contradiction to the predictions of classic galactic wind models. Since we also find a clear mass-metallicity relation for these galaxies, then we conclude that star formation was more efficient for higher mass galaxies, a scenario described under the inverse wind models (Matteucci 1994). With respect to cluster environmental effects, we find there is a significant correlation between galaxy mean age and distance from the cluster center, such that older galaxies inhabit the core. This relationship would nominally support hierarchical scenarios of galaxy formation (younger age in lower density regions); however, environmental effects probably have larger signature in the sample and present-day galaxies are remnants from an epoch of quenching of initial star formation, which would result in the same age gradients.
description: 27 pages, 8 figures, accepted to ApJ, AAS LaTeX
Modelling and Simulation of Scheduling Policies Implemented in Ethernet Switch by Using Coloured Petri Nets
Creators: name: Brahimi, Belynda
name: Aubrun, Christophe
name: Rondeau, Eric
Publisher: name: arXiv
Year: 2006
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: The objective of this paper is to propose models enabling to study the behaviour of Ethernet switch for Networked Control Systems. Two scheduler policies are analyzed: the static priority and the WRR (Weighted Round Robin). The modelling work is based on Coloured Petri Nets. A temporal validation step based on the simulation of these modelling, shows that the obtained results are near to the expected behaviour of these scheduler policies.
description: 8 pages
Phase Field Modeling of Fracture and Stress Induced Phase Transitions
Creators: name: Spatschek, R.
name: Mueller-Gugenberger, C.
name: Brener, E.
name: Nestler, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a continuum theory to describe elastically induced phase transitions between coherent solid phases. In the limit of vanishing elastic constants in one of the phases, the model can be used to describe fracture on the basis of the late stage of the Asaro-Tiller-Grinfeld instability. Starting from a sharp interface formulation we derive the elastic equations and the dissipative interface kinetics. We develop a phase field model to simulate these processes numerically; in the sharp interface limit, it reproduces the desired equations of motion and boundary conditions. We perform large scale simulations of fracture processes to eliminate finite-size effects and compare the results to a recently developed sharp interface method. Details of the numerical simulations are explained, and the generalization to multiphase simulations is presented.
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Schooner Owen Morris
Creators: name: Taylor, Melanie
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: This report focuses on the wreck Owen Morris (1907) a schooner that went ashore on Black Rock, Criccieth, North Wales.
Accretion bursts in magnetized gas-dust protoplanetary disks
Creators: name: Vorobyov, Eduard
name: Khaibrakhmanov, Sergey
name: Basu, Shantanu
name: Audard, Marc
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Aims and Methods. Accretion bursts triggered by the magnetorotational instability (MRI) in the innermost disk regions were studied for protoplanetary gas-dust disks formed from prestellar cores of various mass $M_{\rm core}$ and mass-to-magnetic flux ratio $λ$. Numerical magnetohydrodynamics simulations in the thin-disk limit were employed to study the long-term ($\sim 1.0$~Myr) evolution of protoplanetary disks with an adaptive turbulent $α$-parameter, which depends explicitly on the strength of the magnetic field and ionization fraction in the disk. The numerical models also feature the co-evolution of gas and dust, including the back-reaction of dust on gas and dust growth. Results. Dead zone with a low ionization fraction $x <= 10^{-13}$ and temperature on the order of several hundred Kelvin forms in the inner disk soon after its formation, extending from several to several tens of astronomical units depending on the model. The dead zone features pronounced dust rings that are formed due to the concentration of grown dust particles in the local pressure maxima. Thermal ionization of alkaline metals in the dead zone trigger the MRI and associated accretion burst, which is characterized by a sharp rise, small-scale variability in the active phase, and fast decline once the inner MRI-active region is depleted of matter. The burst occurrence frequency is highest in the initial stages of disk formation, and is driven by gravitational instability (GI), but declines with diminishing disk mass-loading from the infalling envelope. There is a causal link between the initial burst activity and the strength of GI in the disk fueled by mass infall from the envelope. Abridged.
description: Accepted for publication in Astronomy & Astrophysics
Formal Game Grammar and Equivalence
Creators: name: Riggins, Paul
name: McPherson, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: We develop methods to formally describe and compare games, in order to probe questions of game structure and design, and as a stepping stone to predicting player behavior from design patterns. We define a grammar-like formalism to describe finite discrete games without hidden information, allowing for randomness, and mixed sequential and simultaneous play. We make minimal assumptions about the form or content of game rules or user interface. The associated game trees resemble hybrid extensive- and strategic-form games, in the game theory sense. By transforming and comparing game trees, we develop equivalence relations on the space of game systems, which equate games that give players the same meaningful agency. We bring these together to suggest a method to measure distance between games, insensitive to cosmetic variations in the game logic descriptions.
description: 8 pages, 7 figures. Presented at the 2020 IEEE Conference on Games (Full Paper. August 24-27, 2020). arXiv admin note: text overlap with arXiv:1912.03295
The nature of dark matter and the density profile and central behavior of relaxed halos
Creators: name: Salvador-Solé, Eduard
name: Manrique, Alberto
name: González-Casado, Guillermo
name: Hansen, Steen H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show that the two basic assumptions of the model recently proposed by Manrique and coworkers for the universal density profile of cold dark matter (CDM) halos, namely that these objects grow inside out in periods of smooth accretion and that their mass profile and its radial derivatives are all continuous functions, are both well understood in terms of the very nature of CDM. Those two assumptions allow one to derive the typical density profile of halos of a given mass from the accretion rate characteristic of the particular cosmology. This profile was shown by Manrique and coworkers to recover the results of numerical simulations. In the present paper, we investigate its behavior beyond the ranges covered by present-day N-body simulations. We find that the central asymptotic logarithmic slope depends crucially on the shape of the power spectrum of density perturbations: it is equal to a constant negative value for power-law spectra and has central cores for the standard CDM power spectrum. The predicted density profile in the CDM case is well fitted by the 3D Sérsic profile over at least 10 decades in halo mass. The values of the Sérsic parameters depend on the mass of the structure considered. A practical procedure is provided that allows one to infer the typical values of the best NFW or Sérsic fitting law parameters for halos of any mass and redshift in any given standard CDM cosmology.
description: 9 pages, 6 figures, to appear in the ApJ vol. 647, september 20, 2007. Minor changes to match the published version
Control compensation based on upper bound delay in networked control systems
Creators: name: Vatanski, Nikolai
name: Georges, Jean-Philippe
name: Aubrun, Christophe
name: Rondeau, Eric
name: Jounela, Sirkka-Liisa Jämsä
Publisher: name: arXiv
Year: 2006
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Recent interest in networked control systems (NCS) has instigated research in both communication networks and control. Analysis of NCSs has usually been performed from either the network or the control point of view, but not many papers exist where the analysis of both is done in the same context. In this paper an overall analysis of the networked control system is presented. First, the procedure of obtaining the upper bound delay value for packet transmission in the switched Ethernet network is presented. Next, the obtained delay estimate is utilised in delay compensation for improving the Quality of Performance (QoP) of the control systems. The presented upper bound delay algorithm applies ideas from network calculus theory. For the improvement of QoP, two delay compensation strategies, the Smith predictor based and the robust control based delay compensation strategies, are presented and compared.
description: 6 pages
In-orbit Operation and Performance of the CubeSat Soft X-ray Polarimeter PolarLight
Creators: name: Li, Hong
name: Long, Xiangyun
name: Feng, Hua
name: Wu, Qiong
name: Huang, Jiahui
name: Jiang, Weichun
name: Minuti, Massimo
name: Yang, Dongxin
name: Citraro, Saverio
name: Nasimi, Hikmat
name: Yu, Jiandong
name: Jin, Ge
name: Zeng, Ming
name: An, Peng
name: Baldini, Luca
name: Bellazzini, Ronaldo
name: Brez, Alessandro
name: Latronico, Luca
name: Sgro, Carmelo
name: Spandre, Gloria
name: Pinchera, Michele
name: Muleri, Fabio
name: Soffitta, Paolo
name: Costa, Enrico
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: PolarLight is a compact soft X-ray polarimeter onboard a CubeSat, which was launched into a low-Earth orbit on October 29, 2018. In March 2019, PolarLight started full operation, and since then, regular observations with the Crab nebula, Sco X-1, and background regions have been conducted. Here we report the operation, calibration, and performance of PolarLight in the orbit. Based on these, we discuss how one can run a low-cost, shared CubeSat for space astronomy, and how CubeSats can play a role in modern space astronomy for technical demonstration, science observations, and student training.
description: accepted for publication in Advances in Space Research
Anomalous Rashba spin-orbit interaction in InAs/GaSb quantum wells
Creators: name: Li, J.
name: Chang, Kai
name: Hai, G. Q.
name: Chan, K. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate theoretically the Rashba spin-orbit interaction in InAs/GaSb quantum wells(QWs). We find that the Rashba spin-splitting (RSS) depends sensitively on the thickness of the InAs layer. The RSS exhibits nonlinear behavior for narrow InAs/GaSb QWs and the oscillating feature for wide InAs/GaSb QWs. The nonlinear and oscillating behaviors arise from the weakened and enhanced interband coupling. The RSS also show asymmetric features respect to the direction of the external electric field.
description: 3 pages, 4 figures. Appl. Phys. Lett. (in press)
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the flat Palendar lost on the Lleyn coast in March, 1861.
Creators: name: Holden, Chris
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: Research report on the sloop, smack or flat Palendar, wrecked in 1861.
The physiological and perceived effects of drafting on a group of highly trained distance runners
Creators: name: Corvalán-Grössling, Veronica
Publisher: name: University of British Columbia
Year: 2009

description: This investigation examined and compared submaximal oxygen consumption, carbon dioxide production, minute ventilation, and heart rate responses during indoor track running in three running configurations in a group of highly trained distance runners. Maximal oxygen consumption performance testing was conducted to determine at what percentage of their maximal aerobic capacity the subjects were performing at during the test trials. Oxygen consumption, carbon dioxide production, minute ventilation, and heart rate values were measured every 20 seconds during all test trials using a portable calorimeter. Following each trial, runners were asked to rate their perceived exertion using the Borg scale. Subjects were randomly assigned configurations and order of testing. A recovery period of 15 minutes was required between all trials. Nine subjects were tested at 4.47 m/s in three positions, L, DI and D2. During the 4.47 m/s trials, drafting (DI + D2) significantly reduced oxygen consumption (4.02 ± 0.18 1/min leading versus 3.81 ± 0.13 1/min drafting), and carbon dioxide production (3.74 ± 0.23 1/min leading versus 3.32 ± 0.13 1/min drafting) (p < 0.05). There was no significant difference in the reduction of oxygen consumption or carbon dioxide production between running directly behind a single runner, position DI, and running behind on the inside of a triangle, position D2. Minute ventilation and heart rate were not significantly reduced during the drafting (DI + D2) trials. There was a significant reduction in the rating of perceived exertion for running behind on the inside of a triangle, position D2. A sub-group of five subjects was also tested at 5.36 m/s in two positions, L and DI. During the 5.36 m/s trials, drafting in position DI had the same effect as it did at the 4.47 m/s with the exception that the reductions were slightly larger than those observed for the slower pace. Drafting in position DI substantially reduced oxygen consumption (4.76 ± 0.20 1/min leading versus 4.35 ± 0.20 1/min DI), and carbon dioxide production (4.44 ± 0.28 1/min leading versus 4.16 ± 0.26 L/min DI). Minute ventilation, heart rate, and rating of perceived exertion were not reduced during the drafting (DI) trials. These results demonstrate that running within the aerodynamic shadow of another runner is very advantageous for distance runners. Both drafting positions tested were found to be equally effective in conserving energy. Drafting on the inside of a triangle was the position of choice. Coaches should expose athletes to drafting situations in training so that athletes can successfully employ this energy-saving strategy. One must also be aware that athletes who consistently run within a pack or drafting are not obtaining the full benefits of their training regimen.
Measurement and Shaping of Circular Airy Vortex via Cross Phase
Creators: name: Wang, Chen
name: Ren, Yuan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We apply the CP to CAVs for the first time experimentally. Firstly, we introduce the propagation properties of a CAV with the LOCP in the process of measuring TCs, and measure the TCs of CAVs in the self-focusing areas experimentally. Secondly, we shape the CAVs via the HOCP and discuss the manipulaiton of singularities.
description: 4 pages,5 figures