cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Investigating the magnetospheric accretion process in the young pre-transitional disk system DoAr 44 (V2062~Oph). A multiwavelength interferometric, spectropolarimetric, and photometric observing campaign
Creators: name: Bouvier, J.
name: Alecian, E.
name: Alencar, S. H. P.
name: Sousa, A.
name: Donati, J. -F.
name: Perraut, K.
name: Bayo, A.
name: Rebull, L. M.
name: Dougados, C.
name: Duvert, G.
name: Berger, J. -P.
name: Benisty, M.
name: Pouilly, K.
name: Folsom, C.
name: Moutou, C.
name: consortium, the SPIRou
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Young stars interact with their accretion disk through their strong magnetosphere. We investigate the magnetospheric accretion process in the young stellar system DoAr 44. We monitored the system over several rotational cycles, combining high-resolution optical and near-IR spectropolarimetry with long-baseline near-IR interferometry and multicolor photometry. DoAr 44 is a young 1.2 solar mass star, moderately accreting from its disk, and seen at a low inclination. We derive a rotational period of 2.96 d from the system's light curve. Several optical and near-IR line profiles probing the accretion funnel flows and the accretion shock are modulated at the stellar rotation period. The most variable line profile, HeI 1083 nm, exhibits modulated redshifted wings a signature of accretion funnel flows, as well as deep blueshifted absorptions indicative of transient outflows. The Zeeman-Doppler analysis suggests the star hosts a mainly dipolar magnetic field, inclined by about 20 deg. onto the spin axis, with an intensity reaching about 800 G at the photosphere, and up to 2 +/- 0.8 kG close to the accretion shock. The magnetic field appears strong enough to disrupt the inner disk close to the corotation radius, at a distance of about 4.6 stellar radii (0.043 au). This supports the upper limit of 5 stellar radii (0.047 au) we derived for the size of the magnetosphere from long baseline interferometry. DoAr 44 is a pre-transitional disk system, exhibiting a 25-30 au gap in its circumstellar disk, with the inner and outer disks being misaligned. On a scale of 0.1 au or less, our results indicate that the system steadily accretes from its inner disk through its tilted dipolar magnetosphere. We conclude that in spite of a highly structured outer disk, perhaps the signature of ongoing planetary formation, the magnetospheric accretion process proceeds unimpeded at the star-disk interaction level.
description: 18 pages, 22 figures, Astronomy & Astrophysics, in press
Using Chaotic Stream Cipher to Enhance Data Hiding in Digital Images
Creators: name: Haimour, Sana
name: AL-Mousa, Mohammad Rasmi
name: Marie, Rashiq R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: The growing potential of modern communications needs the use of secure means to protect information from unauthorized access and use during transmission. In general, encryption a message using cryptography techniques and then hidden a message with a steganography methods provides an additional layer of protection. Furthermore, using these combination reduces the chance of finding the hidden message. This paper proposed a system which combines schemes of cryptography with steganography for hiding secret messages and to add more complexity for steganography. The proposed system secret message encoded with chaotic stream cipher and afterwards the encoded data is hidden behind an RGB or Gray cover image by modifying the kth least significant bits (k-LSB) of cover image pixels. The resultant stego-image less distorters. After which can be used by the recipient to extract that bit-plane of the image. In fact, the schemes of encryption/decryption and embedding/ extracting in the proposed system depends upon two shred secret keys between the sender and the receiver. An experiment shows that using an unauthorized secret keys between the sender and the receiver have totally different messages from the original ones which improve the confidentiality of the images.
description: 7 pages
Black hole thermodynamics from simulations of lattice Yang-Mills theory
Creators: name: Catterall, Simon
name: Wiseman, Toby
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We report on lattice simulations of 16 supercharge SU(N) Yang-Mills quantum mechanics in the 't Hooft limit. Maldacena duality conjectures that in this limit the theory is dual to IIA string theory, and in particular that the behavior of the thermal theory at low temperature is equivalent to that of certain black holes in IIA supergravity. Our simulations probe the low temperature regime for N <= 5 and the intermediate and high temperature regimes for N <= 12. We observe 't Hooft scaling and at low temperatures our results are consistent with the dual black hole prediction. The intermediate temperature range is dual to the Horowitz-Polchinski correspondence region, and our results are consistent with smooth behavior there. We include the Pfaffian phase arising from the fermions in our calculations where appropriate.
description: 4 pages, 4 figures
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the Sinking of: Jane & Eliza (Schooner)
Creators: name: Davies, Gareth J.S.
Publisher: name: Archaeology Data Service
Year: 2023

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Jane and Eliza was a cargo schooner which sailed predominately between ports in the U.K, Ireland, occasionally The Baltic and European North Sea ports. Cargoes carried included raw materials, refined material and grains. On Oct 19th 1885, the Jane and Eliza was reported to have struck a rock in Bardsey Sound while sailing from Port Dinorwic Wales for Milford Wales and sank. The crew were saved.
Online system identification in a Duffing oscillator by free energy minimisation
Creators: name: Kouw, Wouter M
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Systems and Control (eess.SY)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Online system identification is the estimation of parameters of a dynamical system, such as mass or friction coefficients, for each measurement of the input and output signals. Here, the nonlinear stochastic differential equation of a Duffing oscillator is cast to a generative model and dynamical parameters are inferred using variational message passing on a factor graph of the model. The approach is validated with an experiment on data from an electronic implementation of a Duffing oscillator. The proposed inference procedure performs as well as offline prediction error minimisation in a state-of-the-art nonlinear model.
description: 10 pages, 5 figures. Accepted to the International Workshop on Active Inference (final author version)
Dynamical generalization of Yetter's model based on a crossed module of discrete groups
Creators: name: Bochniak, Arkadiusz
name: Hadasz, Leszek
name: Ruba, Błażej
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a dynamical lattice model based on a crossed module of possibly non-abelian finite groups. Its degrees of freedom are defined on links and plaquettes, while gauge transformations are based on vertices and links of the underlying lattice. We specify the Hilbert space, define basic observables (including the Hamiltonian) and initiate a~discussion on the model's phase diagram. The constructed model generalizes, and in appropriate limits reduces to, topological theories with symmetries described by groups and crossed modules, lattice Yang-Mills theory and $2$-form electrodynamics. We conclude by reviewing classifying spaces of crossed modules, with an emphasis on the direct relation between their geometry and properties of gauge theories under consideration.
description: 55 pages, 27 figures
Relationships between shrews (sorex spp.) and downed wood in the Vancouver watersheds, B.C.
Creators: name: Craig, Vanessa Joy
Publisher: name: University of British Columbia
Year: 2009

description: I studied relationships between shrew populations, downed wood, and vegetation in 1991 and 1992 on study areas in the Vancouver watersheds, B.C. I conducted a mark-recapture study on grids with varying amounts of downed wood ('low', 'medium', and 'high'). Three species of shrews, Sorex monticolus, S. vagrans, and S. cinereus were captured during the study. Shrew populations were small, and appeared to increase between 1991 and 1992, but trends were influenced by a change in trapping regime between years. Size of shrew populations did not vary directly with amount of downed wood but showed a more complex relationship with habitat. In general, larger shrew populations were associated with abundant, moderate-sized pieces of wood, and increased vegetative and litter cover. Larger populations also had a disproportionately greater number of reproductively active females, suggesting that the areas they lived in were better shrew habitat. Relation of shrew captures to the microhabitat surrounding trap sites indicated that shrews associated with larger pieces of downed wood and potential foraging sites. Shrews inhabiting areas with diversity in characteristics of downed wood, both in size and in abundance (on 'high' grids), were caught more frequently on sites with larger pieces of wood and on sites where downed wood was closer together. The three species of shrew captured were similar in terms of life history and microhabitat use, and appeared to be dispersed in the environment through territoriality/dominance relationships. Tracking individual shrews confirmed that downed wood was an important habitat component. Shrew travel routes had greater continuity of cover than did areas farther away from their trails. Shrew trails were negatively associated with downed wood <6 cm in diameter. On areas with low diversity in characteristics and abundance of downed wood, shrews were associated strongly with abundance, but not diameter of downed wood. On areas with high diversity in characteristics and abundance of downed wood, shrew trails were associated with greater abundance and cover by logs >12 cm in diameter. To encourage larger, reproductively active shrew populations in managed forest stands, I recommend that a range of tree species and lengths of wood pieces be left on a cutblock. Emphasis should be placed on providing pieces >6 cm in diameter. Pieces should be dispersed to provide a continuous log network. Patches of trees should be left standing to provide a future source of downed wood on the site. Areas should not be burned, because it destroys litter, moss, associated insect communities, and hardens logs.
Point Defect Dynamics in Two-Dimensional Colloidal Crystals
Creators: name: Libal, A.
name: Reichhardt, C.
name: Reichhardt, C. J. Olson
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the topological configurations and dynamics of individual point defect vacancies and interstitials in a two-dimensional colloidal crystal. Our Brownian dynamics simulations show that the diffusion mechanism for vacancy defects occurs in two phases. The defect can glide along the crystal lattice directions, and it can rotate during an excited topological transition configuration to assume a different direction for the next period of gliding. The results for the vacancy defects are in good agreement with recent experiments. For the interstitial point defects, which were not studied in the experiments, we find several of the same modes of motion as in the vacancy defect case along with two additional diffusion pathways. The interstitial defects are more mobile than the vacancy defects due to the more two-dimensional nature of the diffusion of the interstitial defects.
description: 8 pages, 9 postscript figures. Version to appear in Phys. Rev. E
Electronic structure of half-metallic magnets
Creators: name: Nanda, B. R. K.
name: Dasgupta, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We have analyzed the electronic structure of half-metallic magnets based on first principles electronic structure calculations of a series of semi-Heusler alloys. The characteristic feature of the electronic structure of semi-Heusler systems is a d-d gap in the density of states lying at/close to the Fermi level depending on the number of valence electrons. We have employed various indicators of chemical bonding to understand the origin of the gap in these systems, which is crucial for their half-metallic property. The density of states of other half-metallic magnets also supports a gap and it is a generic feature of these systems. We have discussed in some details the origin of magnetism, in particular, how the presence of the gap is crucial to stabilize half-metallic ferro and ferri magnetism in these systems. Finally, we have studied the role of magnetic impurities in semiconducting semi-Heusler systems. We show with the aid of model supercell calculations that these systems are not only ferromagnetic but also half-metallic with possibly high Curie temperature.
description: 7 pages, 6 figures
Opportunistic Routing Metrics: A Timely One-Stop Tutorial Survey
Creators: name: Abdollahi, Mostafa
name: Eshghi, Farshad
name: Kelarestaghi, Manoochehr
name: Bag-Mohammadi, Mozafar
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: High-speed, low latency, and heterogeneity features of 5G, as the common denominator of many emerging and classic wireless applications, have put wireless technology back in the spotlight. Continuous connectivity requirement in low-power and wide-reach networks underlines the need for more efficient routing over scarce wireless resources, in multi-hp scenarios. In this regard, Opportunistic Routing (OR), which utilizes the broadcast nature of wireless media to provide transmission cooperation amongst a selected number of overhearing nodes, has become more promising than ever. Crucial to the overall network performance, which nodes to participate and where they stand on the transmission-priority hierarchy, are decided by user-defined OR metrics embedded in OR protocols. Therefore, the task of choosing or designing an appropriate OR metric is a critical one. The numerousness, proprietary notations, and the objective variousness of OR metrics can cause the interested researcher to lose insight and become overwhelmed, making the metric selection or design effort-intensive. While there are not any comprehensive OR metrics surveys in the literature, those who partially address the subject are non-exhaustive and lacking in detail. Furthermore, they offer limited insight regarding related taxonomy and future research recommendations. In this paper, starting with a custom tutorial with a new look to OR and OR metrics, we devise a new framework for OR metric design. Introducing a new taxonomy enables us to take a structured, investigative, and comparative approach to OR metrics, supported by extensive simulations. Exhaustive coverage of OR metrics, formulated in a unified notation, is presented with sufficient details. Self-explanatory, easy-to-grasp, and visual-friendly quick references are provided, which can be used independently from the rest of the paper.
description: 41 Pages, 28 figures
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Jane & Ellen of Nevin
Creators: name: Perks, Graeme
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Jane and Ellen was a wooden schooner of 81 tons built by Richard Davies of Nevin in 1839 for William Parry and others, registered at Beaumaris. Jane and Ellen operated as a coaster travelling to Ireland, London and other English, Scottish and French ports. Jane and Ellen was taken over by David Parry after his fathers death and operated by his wife after his death. In November 1877 the crew were rescued by the Abersoch lifeboat after Jane and Ellen's anchor had parted, before she was driven ashore. Jane and Ellen was recovered and continued trading, but she was sold in about 1882 to John Jones a diver of Bangor. The Jane and Ellen was then used as a vessel supporting commercial diving and after John Jones death in 1885 sold as a hulk with fittings.
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: SV Jane Ellen
Creators: name: Whitewright, Malcolm
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: Report on the wreck of the schooner SV Jane Ellen for which there is a record of having gone aground on 14 October 1881 at Abererch, Caernarfonshire, Wales.
Pseudospin and spin symmetry in the relativistic generalized Woods-Saxon potential including Coulomb-like tensor potential
Creators: name: Akbar, J.
name: Suparmi, A.
name: Cari, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The Dirac Equation is solved approximately for relativistic generalized Woods-Saxon potential including Coulomb-like tensor potential in exact pseudospin and spin symmetry limits. The bound states energy eigenvalues are found by using wavefunction boundary conditions, and corresponding radial wavefunctions are obtained in terms of hypergeometric function. Some numerical examples are given for the dependence of bound states energy eigenvalues on quantum numbers and potential parameters.
description: 22 pages, 6 gifures, 2 tables, accepted manuscript
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the Sinking of: Janet & Alice (Schooner)
Creators: name: Davies, Gareth J.S.
Publisher: name: Archaeology Data Service
Year: 2023

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Janet and Alice was a cargo schooner which sailed between ports in the U.K, Baltic, European North Sea and Mediterranean. Cargoes carried included raw materials, refined material and grains. On Nov 26th 1884, the Janet and Alice sprang a leak during a storm approximately 8 nautical miles east of the Cardigan Bay Lightship and sank. The crew who had abandoned the Janet and Alice attempted to reach the coast in a lifeboat. However due to the weather conditions 2 of the crew including the captain were drowned near the shore at Aberaeron Wales.
Narrow Trans-TeV Higgs Bosons and $H\to hh$ Decays: Two LHC Search Paths for a Hidden Sector Higgs Boson
Creators: name: Bowen, Matthew
name: Cui, Yanou
name: Wells, James
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the addition of a condensing singlet scalar field to the Standard Model. Such a scenario may be motivated by any number of theoretical ideas, including the common result in string-inspired model building of singlet scalar fields charged under some hidden sector gauge symmetry. For concreteness, we specify an example model of this type, and consider the relevant constraints on Higgs physics, such as triviality, perturbative unitarity and precision electroweak analysis. We then show that there are two unique features of the phenomenology that present opportunities for discovery at the Large Hadron Collider (LHC). First, it is possible to identify and discover a narrow trans-TeV Higgs boson in this scenario -- a mass scale that is well above the scale at which it is meaningful to discuss a SM Higgs boson. Second, the decays of the heavier scalar state into the lighter Higgs bosons can proceed at a high rate and may be the first discovery mode in the Higgs sector.
description: 21 pages, 5 figures
The GALEX Arecibo SDSS Survey (GASS)
Creators: name: Catinella, B.
name: Schiminovich, D.
name: Kauffmann, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The GALEX Arecibo SDSS Survey (GASS) is a large targeted survey that started at Arecibo in March 2008. GASS is designed to measure the neutral hydrogen content of ~1000 massive galaxies (with stellar mass Mstar > 10^10 Msun) at redshift 0.025
description: 3 pages, 2 figures. To appear in proceedings of "The Evolution of Galaxies through the Neutral Hydrogen Window", R. Minchin & E. Momjian eds. Higher resolution version at http://www.mpa-garching.mpg.de/GASS/pubs.php
Continuously decoupling single-qubit operations from a perturbing thermal bath of scalar bosons
Creators: name: Fanchini, F. F.
name: Hornos, J. E. M.
name: Napolitano, R. d. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the use of continuously-applied external fields to maximize the fidelity of quantum logic operations performed on a decohering qubit. Assuming a known error operator and an environment represented by a scalar boson field at a finite temperature, we show how decoherence during logical operations can be efficiently reduced by applying a superposition of two external vector fields: one rotating orthogonally to the direction of the other, which remains static. The required field directions, frequency of rotation and amplitudes to decouple noise dynamically are determined by the coupling constants and the desired logical operation. We illustrate these findings numerically for a Hadamard quantum gate and an environment with ohmic spectral density.
description: 4 pages, 1 figure
Next step in gravity and cosmology: fundamental theory or data-driven models?
Creators: name: Calcagni, Gianluca
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 comment on the difference between bottom-up (i.e., data-driven, ad hoc) and top-down (i.e., derived from a fundamental theory of gravitational interactions) cosmological models, their respective status, predictive power and viability. We fuel the debate on whether present and future research on theoretical models of inflation, dark energy and gravitational waves should concentrate on bottom-up models such as $f(R)$, Horndeski or DHOST theories or on cosmological models of quantum gravity.
description: 6 pages. Specialty Grand Challenge article prepared for section Cosmology of Frontiers in Astronomy and Space Sciences
AC και DC ηλεκτρικές μετρήσεις σε νήματα
Creators: name: Καραγιάννης, Ιωάννης Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Λαμπτήρες πυρακτώσεως
Φαινόμενα υστέρησης σε λαμπτήρες πυρακτώσεως
AC και DC ηλεκτρικές μετρήσεις σε νήματα βολφραμίου
Ιncandescent lamps
Hysteresis in Ιncandescent lamps
AC and DC measurements in Tungsten wires

description: Τα νήματα βολφραμίου στους λαμπτήρες πυρακτώσεως είναι ένα από τα παλαιότερα νανουλικά στην νανοτεχνολογία.. Χρησιμοποιώντας θερμο-πλαστικές τεχνικές (SPD techniques) πριν το 1960, οδήγησαν σε μια μορφολογία των νημάτων, η οποία έλυνε πολλά προβλήματα των τότε λαμπτήρων πυρακτώσεως .Η καλύτερη λύση βρέθηκε με την επιμήκυνση των κόκκων βολφραμίου και τον εντοπισμό των μικρο-πόρων στα όριά τους. Οι μικρο-πόροι που είναι της τάξεως των 100nm σε μέγεθος γεμίζουν με αέριο κάλιο κατά τη θέρμανσή τους, προκαλώντας φαινόμενα υστέρησης στις χαρακτηριστικές καμπύλες i-v. Με τη βοήθεια των DC και AC ηλεκτρικών μετρήσεων διερευνούμε τα φαινόμενα της υστέρησης. Μετά από διενέργεια προσομοιώσεων θεωρούμε ότι τα νήματα βολφραμίου συμπεριφέρονται ως μίγμα υλικών δύο φάσεων, ενός καθαρού μετάλλου και ενός το οποίο συμπεριφέρεται σαν ημιαγωγός-μονωτής.. Αυτό το σύστημα περιγράφεται από ένα ισοδύναμο ηλεκτρικό κύκλωμα του τύπου R1//R2C. Θεωρώντας ότι η συνολική αντίσταση του υλικού δίνεται από την παράλληλη αντίσταση R1//R2, σημαίνει πολλά για τις ηλεκτρικές μετρήσεις των μετάλλων σε πολλά επιστημονικά πεδία και εφαρμογές.
description: Tungsten wires in incandescent lamps are one of the oldest bulk nanometals in nanotechnology. Using severe plastic deformation (SPD) techniques before the 1960's, an application driven thermo-mechanical technology of tungsten wires morphology solved many problems of the devices (incandescent lamps). The optimum solution found with highly elongated clusters of W-grains and nano-vacancies. The nano-vacancies in the order of 100nm are filling with potassium impurities upon heating causing hysteresis effects in the i-v curves. DC (electrical heating) and the AC electrical measurements (complex impedance Z) allows the investigation of hysteresis effect. After appropriate simulations the tungsten filament is considered to be a two-phase composite material, a pure metal and one that behaves like a semiconductor. This system is described by a circuit type R1//R2C. Assuming that the metal’s resistance is given by this type (R1//R2), this means a lot to electrical measurements in many areas.
description: Σε συνεργασία με το Ινστιτούτο Τεχνολογίας Γκρενόμπλ (Γαλλία), το ΕΚΕΦΕ Δημόκριτος, και το CNRS (Centre National de la Researche Scientifique, Γαλλία)
Hillslope hydrology in the Rennell Sound area of the Queen Charlotte Islands
Creators: name: Tyler, John Dawes
Publisher: name: University of British Columbia
Year: 2009

description: This experiment was designed to study the hydrologic response of three first order watersheds to the inputs of precipitation, especially those inputs received during storm events. The study was conducted in the Gregory Creek watershed in the Rennell Sound area of the Queen Charlotte Islands. There were six data collection sites, two in each of three sub-basins. Groundwater levels and surface flow were monitored over an 82 day period from November 26th, 1991 to February 15th, 1992. Precipitation data were collected over a 40 day period from November 26th, 1991 to January 4th 1992. The data were analyzed by comparing precipitation data to groundwater levels and surface flow using time-series and regression analysis. Storm precipitation was compared to groundwater levels and surface flow (for the same time as the storm event). Including antecedent precipitation in this analysis did not increase the number of significant regressions relationships. Time-series analysis revealed strong correlations between groundwater levels at wells within the same site. The two sites in watershed number one produced more significant relations between storm precipitation and groundwater response than watersheds two and three when analyzed using time-series analysis. The watershed that produced significant results using time-series analysis did not produce significant regression results. Alternatively, one watershed which did not produce significant time-series results did produce significant regression results. Mean groundwater level changes during storm events were significantly greater at the upper site in one watershed, the lower site in another and inconsistent in the third. There was a wide range in the mean time to peak for all sites during storm events (5.6 hr - 12.1 hr), but the differences were not statistically significant. An analysis of covariance indicated that there was not a common regression equation that defined the relation of changes in groundwater levels or time to peak during storm events for all three watersheds in the study. It is hypothesized that the differences between sites and watersheds may be a result of individual differences in geologic characteristics at each site and instrument location.
On the Impact of Partial Sums on Interconnect Bandwidth and Memory Accesses in a DNN Accelerator
Creators: name: Chandra, Mahesh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Hardware Architecture (cs.AR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Dedicated accelerators are being designed to address the huge resource requirement of the deep neural network (DNN) applications. The power, performance and area (PPA) constraints limit the number of MACs available in these accelerators. The convolution layers which require huge number of MACs are often partitioned into multiple iterative sub-tasks. This puts huge pressure on the available system resources such as interconnect and memory bandwidth. The optimal partitioning of the feature maps for these sub-tasks can reduce the bandwidth requirement substantially. Some accelerators avoid off-chip or interconnect transfers by implementing local memories; however, the memory accesses are still performed and a reduced bandwidth can help in saving power in such architectures. In this paper, we propose a first order analytical method to partition the feature maps for optimal bandwidth and evaluate the impact of such partitioning on the bandwidth. This bandwidth can be saved by designing an active memory controller which can perform basic arithmetic operations. It is shown that the optimal partitioning and active memory controller can achieve up to 40% bandwidth reduction.
On the pp-wave limit and the BMN structure of new Sasaki-Einstein spaces
Creators: name: Kuperstein, Stanislav
name: Mintkevich, Oded
name: Sonnenschein, Jacob
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct the pp-wave string associated with the Penrose limit of $Y^{p,q}$ and $L^{p,q,r}$ families of Sasaki-Einstein geometries. We identify in the dual quiver gauge theories the chiral and the non-chiral operators that correspond to the ground state and the first excited states. We present an explicit identification in a prototype model of $L^{1,7,3}$.
description: 21 pages, JHEP format, 5 figures, acknowledgement corrected
Post-Newtonian equation for the energy levels of a Dirac particle in a static metric
Creators: name: Arminjon, Mayeul
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study first the Hamiltonian operator H corresponding to the Fock-Weyl extension of the Dirac equation to gravitation. When searching for stationary solutions to this equation, in a static metric, we show that just one invariant Hermitian product appears natural. In the case of a space-isotropic metric, H is Hermitian for that product. Then we investigate the asymptotic post-Newtonian approximation of the stationary Schroedinger equation associated with H, for a slow particle in a weak-field static metric. We rewrite the expanded equations as one equation for a two-component spinor field. This equation contains just the non-relativistic Schroedinger equation in the gravity potential, plus correction terms. Those "correction" terms are of the same order in the small parameter as the "main" terms, but are numerically negligible in the case of ultra-cold neutrons in the Earth's gravity.
description: 12pt LaTeX, 17 pages. v2: version accepted for publication in Phys.Rev.D: comments on scalar product changed, using a recent paper; discussion of PN expansions simplified (no change of units any more); numerical estimates for ultra-cold neutrons in the Earth's gravity
Αξιολόγηση της αποτελεσματικότητας της ανάστροφης έμφραξης σε ακρορριζεκτομές δοντιών με και χωρίς προηγηθείσα ενδοδοντική θεραπεία. Βιβλιογραφική ανασκόπηση και μετα-ανάλυση.
Creators: name: Κουμλελής, Χρήστος Θεόδωρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ακρορριζεκτομή
Ανάστροφη έμφραξη
Ενδοδοντική θεραπεία
Apicoectomy
Reverse filling
Root canal treatment

description: Η ακρορριζεκτομή αποτελεί μια χειρουργική μέθοδο θεραπείας δοντιών με χρόνιες περιακρορριζικές αλλοιώσεις και ενδείκνυται σε περιπτώσεις όπου η αρχική ενδοδοντική θεραπεία ή η επανάληψή της έχουν αποτύχει ή η εφαρμογή τους θεωρείται από πολύ δύσκολη ως αδύνατη. Στόχος της παρούσης εργασίας ήταν η διερεύνηση των βιβλιογραφικών δεδομένων σχετικά με την αποτελεσματικότητα της ανάστροφης έμφραξης που εφαρμόζεται κατά τη διαδικασία της ακρορριζεκτομής, είτε έχει προηγηθεί ενδοδοντική θεραπεία είτε όχι. Μετά από ενδελεχή αναζήτηση στις βάσεις δεδομένων Pubmed και Cochrane για τα τελευταία 25 έτη, ανευρέθηκαν λίγα σχετικά άρθρα που περιείχαν ανάλογα δεδομένα. Η μεγάλη ανομοιογένεια των δεδομένων αυτών, όμως, κατέστησε αδύνατη την αξιόπιστη στατιστική ανάλυση. Από τη μελέτη και ανάλυση του πλήρους κειμένου των άρθρων προέκυψαν ενδείξεις ότι η ανάστροφη έμφραξη, αν παραμείνει αδιατάρακτη, δύναται να οδηγήσει σε ίαση την πλειονότητα των περιστατικών, κυρίως με τις τεχνικές της «μικροχειρουργικής» και χρήση MTA ή με την απλούστερη τεχνική της σύνθετης ρητίνης τύπου Retroplast. Δεδομένου, ωστόσο, του μικρού αριθμού σχετικών μελετών, απαιτείται σημαντική περαιτέρω ερευνητική προσπάθεια, ώστε να προκύψουν ασφαλή συμπεράσματα.
description: Apicoectomy is a surgical method of treating teeth with chronic periapical lesions and it is indicated in cases where the initial and/ or the second attempt for root canal treatment has failed or it is considered very difficult or impossible to be applied. The aim of the present study was the review of the literature about the effectiveness of the reverse filling in apicoectomies, whether a prior root canal treatment has been attempted or not. After an extensive search in the electronic databases “Pubmed” and “Cochrane” for the last 25 years, only a small amount of articles with relative data were recovered. However, due to the high degree of diversity of the data, a reliable statistical analysis was considered impossible. The full-text study of the recovered articles revealed evidence that the reverse filling, should it remain intact, can lead to the healing of the majority of cases, especially when the technique of “microsurgery” with MTA or the simper technique with resin composite (e.g. Retroplast) are applied. Considering, though, the small number of studies with relevant data, considerable further research is needed in order to deduct safe conclusions.
Το άστυ σε μυθιστορήματα της Σώτης Τριανταφύλλου
Creators: name: Παπάκη, Ιωάννα Σταύρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Λογοτεχνική πόλη
Σώτη Τριανταφύλλου
Μυθιστόρημα
Literary city
Soti Triantafyllou
Novel

description: Η μεταπτυχιακή διπλωματική εργασία «Το άστυ σε μυθιστορήματα της Σώτης Τριανταφύλλου» διερευνά διάφορες όψεις της λογοτεχνικής πόλης και τον τρόπο με τον οποίο αυτές αποτυπώνονται στα επτά πεζογραφήματα που έχουν επιλεχθεί. Στην εισαγωγή που προηγείται της εξέτασης των κειμένων, επιχειρείται μια περιδιάβαση στις συγγένειες του άστεως με τη λογοτεχνική γραφή, καθώς και μια σκιαγράφηση του λογοτεχνικού τοπίου κατά τις δεκαετίες 1980 και 1990, όπου και εντάσσεται χρονολογικά η συγγραφέας. Στη συνέχεια, με αφετηρία θεωρίες που ασχολούνται με τη λογοτεχνική απεικόνιση του αστικού χώρου και εργαλεία όπως το μοτίβο του περιπατητή–flâneur, αλλά και μέσω αναγνωστικών προσεγγίσεων, η μελέτη έχει σκοπό να αναδείξει τις σχέσεις που αναπτύσσονται μεταξύ του άστεως και των λογοτεχνικών χαρακτήρων, όπως και την αλληλεπίδραση της μυθιστορηματικής πόλης με την αφήγηση. Ερμηνεύοντας την καθοριστική επίδραση της αστικής εμπειρίας σε ζητήματα ταυτότητας και την εγγραφή του αστικού χώρου ως προνομιακού, η εργασία αποπειράται τέλος να συνοψίσει και να περιγράψει το μόρφωμα της λογοτεχνικής πόλης και την πρωταγωνιστική του δράση στα επτά αυτά έργα της Σώτης Τριανταφύλλου.
description: The postgraduate dissertation “The city through Soti’s Triantafyllou novels” examines various aspects of the literary city and the ways through which those are depicted in the seven selected pieces of work of the writer. In the introduction preceding the specific pieces’ analyses, a first attempt is made to examine the relationship between the city and the literary writing, while illustrating the portrait of the literary landscape during the 1980’s and the 1990’s, decades which the writer belongs to. With the starting point being several theories on literary representation of the urban environment and making use of different tools, as for example the wanderer’s (“flâneur”) motif or the reading approach, the present study aims to highlight the links between the city and the literary characters, as well as the interaction of the city and the narration itself. While the urban space is ‘designated’ as a privileged one, the extent of the urban experience’s impact on identity issues is subsequently discussed and interpreted. Ultimately, it is the city and its different facets, as those emerge through the seven selected literary works of Soti Triantafyllou, that tends to become the protagonist leading the action.
Timelike Form Factor of the Kaon for |Q^2|=M^2(J/psi)
Creators: name: Seth, Kamal K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The timelike form factor of the charged kaon is evaluated at |Q^2|=M^2(J/psi)=9.59 GeV^2 by relating it to B(J/psi->K+K-), B(J/psi->K_SK_L) and B(J/psi->e+e-). The resulting value, |Q^2|F_K(9.59 GeV^2)=0.81+-0.18 GeV^2 is found to be in good agreement with |Q^2|F_K(13.5 GeV^2)=0.85+-0.05 GeV^2 obtained recently by the direct measurement of the reaction e+e--> K+K-.
description: 2 pages, 1 figure, published in PRD
Alignment and scattering of colliding active droplets
Creators: name: Lippera, Kevin
name: Benzaquen, Michael
name: Michelin, Sebastien
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Active droplets emit a chemical solute at their surface that modifies their local interfacial tension. They exploit the nonlinear coupling of the convective transport of solute to the resulting Marangoni flows to self-propel. Such swimming droplets are by nature anti-chemotactic and are repelled by their own chemical wake or their neighbours. The rebound dynamics resulting from pairwise droplet interactions was recently analysed in detail for purely head-on collisions using a specific bispherical approach. Here, we extend this analysis and propose a reduced model of a generic collision to characterise the alignment and scattering properties of oblique droplet collisions and their potential impact on collective droplet dynamics. A systematic alignment of the droplets' trajectories is observed for symmetric collisions, when the droplets interact directly, and arises from the finite-time rearrangement of the droplets' chemical wake during the collision. For more generic collisions, complex and diverse dynamical regimes are observed, whether the droplets interact directly or through their chemical wake, resulting in a significant scattering.
description: 12 pages, 7 figures, to appear in Soft Matter
Extending the Model of KH 15D: Estimating the Effects of Forward Scattering and Curvature of the Occulting Ring Edge
Creators: name: Silvia, D. W.
name: Agol, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The periodic eclipses of the pre-main-sequence binary, KH 15D, have been explained by a circumbinary dust ring inclined to the orbital plane, which causes occultations of the stars as they pass behind the ring edge. We compute the extinction and forward scattering of light by the edge of the dust ring to explain (1) the gradual slope directly preceding total eclipse, (2) the gradual decline at the end of ingress, and (3) the slight rise in flux at mid-eclipse. The size of the forward scattering halo indicates that the dust grains have a radius of a ~ 6 (D/3 AU) microns, where D is the distance of the edge of the ring from the system barycenter. This dust size estimate agrees well with estimates of the dust grain size from polarimetry, adding to the evidence that the ring lies at several AU. Finally, the ratio of the fluxes inside and outside eclipse independently indicates that the ring lies at a few astronomical units.
description: 8 pages, 6 Postscript figures, to see the mpeg file associated with figure 4 go to: http://mdbworks.net/devin/kh15d.mpg
Magnetic field geometry and magnetospheric environment of the strongly magnetic Of?p star NGC 1624-2
Creators: name: Järvinen, S. P.
name: Hubrig, S.
name: Schöller, M.
name: Küker, M.
name: Ilyin, I.
name: Chojnowski, S. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: NGC 1624-2 is an O7f?p star with a reported probable polar magnetic field strength $\ge$ 20 kG, which is the strongest magnetic field ever measured in an O-type star. We study the variability of the mean longitudinal magnetic field $\langle B_z \rangle$ and the mean field modulus $\langle B \rangle$ to obtain constraints on its field geometry. Only one magnetic pole is observable over the rotation cycle. The approximately sinusoidal variation of $\langle B_z \rangle$ and the ratio of the values of the extrema of $\langle B \rangle$ indicate that there is an important component of the field that is dipolar. The $\langle B_z \rangle$ values measured over the rotation cycle are in the range from $-0.2$ to 4.5 kG, whereas the values for $\langle B \rangle$ vary between 9 and 12 kG. The $\langle B_z \rangle$ values obtained using the O III $λ$7455 emission line are in the range from 0.4 to 2.3 kG and show a variability pattern similar to that detected for the absorption lines. The fact that the phase of the $\langle B_z \rangle$ minimum coincides with the phase of the $\langle B \rangle$ maximum, indicates that the field structure must significantly depart from a centred dipole. Further, we discuss the nature of the observed variable Stokes $V$ profiles corresponding to a longitudinal field of negative polarity detected in the emission He I lines and present the first MHD numerical simulations of the gas flow in the magnetosphere of this star.
description: Accepted to be published in MNRAS
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: John
Creators: name: Adamczyk, Richard
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The John originated in Saint Malo and wrecked in Cardigan Bay off the coast of Pwllheli in the mid to late sixteenth century. The vessel transported a cargo of wine.
Simulation of QED Radiation in Particle decays using the YFS Formalism
Creators: name: Hamilton, Keith
name: Richardson, Peter
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we describe a program (SOPHTY) implementing QED corrections to decays in the HERWIG++ event generator. In order to resum the dominant soft emissions to all orders, the program is based on the YFS formalism. In addition, universal large collinear logarithms are included and the approach can be systematically extended to incorporate exact, process specific, higher order corrections to decays. Due to the large number of possible decay modes the program is designed to operate, as far as possible, independently of the decay matrix elements.
description: 30 pages, 7 figures; Minor revisions: more details given on the validity of the approximation used, additional histogram to added in figure 3, references added
Anisotropic Outflows and IGM Enrichment
Creators: name: Martel, Hugo
name: Pieri, Matthew M.
name: Grenon, Cedric
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have designed an analytical model for the evolution of anisotropic galactic outflows. These outflows follow the path of least resistance, and thus travel preferentially into low-density regions, away from cosmological structures where galaxies form. We show that anisotropic outflows can significantly enrich low-density systems with metals.
description: Proceedings of Chemodynamics 2006, Lyon, 2 pages, 1 figure, style file included
Use of 3D printing in astronomical mirror fabrication
Creators: name: Roulet, Melanie
name: Atkins, Carolyn
name: Hugot, Emmanuel
name: Snell, Robert
name: van de Vorst, Bart
name: Morris, Katherine
name: Marcos, Michel
name: Todd, Iain
name: Miller, Christopher
name: Dufils, Joris
name: Farkas, Szigfrid
name: Mezo, Gyorgy
name: Tenegi, Fabio
name: Vega-Moreno, Afrodisio
name: Schnetler, Hermine
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In this paper we are exploring the possibilities of 3D printing in the fabrication of mirrors for astronomy. Taking the advantages of 3D printing to solve the existing problems caused by traditional manufacturing, two proof-of-concept mirror fabrication strategies are investigated in this paper. The First concept is a deformable mirror with embedded actuator supports system to minimise errors caused by the bonding interfaces during mirror assembly. The second concept is the adaption of the Stress Mirror Polishing (SMP) technique to a variety of mirror shapes by implemented a printed thickness distribution on the back side of the mirror. Design investigations and prototypes plans are presented for both studies.
Hydrogen bonds and dynamics of liquid water and alcohols
Creators: name: Kholmanskiy, Alexander
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Using modified Arrhenius approximations, the activation energies of water, alcohols, and hexane structure rearrangement reactions responsible for temperature dependences of their dynamic and dielectric characteristics were determined. The interactions of van der Waals and charged centers of water and alcohol molecules regulate translational and rotational motion of molecules, ensuring coordination and balance of thermal effects of exothermic and endothermic reactions of changes in local structure of liquid. The long range action of fluctuating dipoles of hydrogen bonds and their resonant excitation by thermal energy underlies the anomalies in temperature dependences of water properties and initiates its phase transitions at points 273 K and 298 K. The deviation of the molecular dynamics of water from Arrhenius and Stokes Einstein equations in range from 273 to 298 K was associated with a high contribution of collective dynamics of ice like phase of water consisting of a network of hydrogen bonds structured by hexagonal clusters of Ih ice.